CN1795128A - Container for convenience food and convenience food using the same - Google Patents

Abstract

A container for instant food is composed of a container body for containing the contents and a cover body sealed by the top flange part and having an unsealing flap part, tear starting points arranged at both sides of the unsealing flap part, and a substantially U-shaped or arc-shaped tear-stopping half-cut groove formed on a straight line extending from the starting points in the tear direction and protruding in the tear direction. In this container, the tear stop half-cut groove can reliably stop the tearing of the lid body, and therefore, the tape-shaped flap portion can be prevented from being separated from the lid body.

Description

Container for convenience food and convenience food using the same

technology area

The present invention relates to containers suitable for instant food such as ramen noodles in cups that need to be covered after pouring hot water, and containers for instant fried noodles such as instant fried noodles that are poured into hot water and then poured out. Convenience food in these containers.

Background technique

The container for instant food of the type in which the lid is sealed to the container body requires airtightness in which the sealing portion does not peel off during transportation and handling. However, if the lid is firmly sealed on the container body, there will be a problem that the lid cannot be easily peeled off from the body when eating instant food.

In order to easily unseal a container for instant food having a sealed lid, it is recommended that the lid be partially unsealable. For example, in the airtight container proposed in JP-A-54-88490 (Patent Document 1), the lid has a lid body made of an oriented easy-to-tear film, and outwardly from the lid body in the orientation direction of the above-mentioned film. Protruding tabs, a pair of cuts provided near the root of the tabs. When the protruding piece is lifted up, the cover body is torn from the pair of cutouts to the other end side, and the cover body is unsealed in a strip shape.

However, in the airtight container disclosed in JP-A-54-88490, if the strength of lifting the protruding piece is too large, the belt piece connected to the protruding piece will reach the other end and be separated from the container body. Convenience foods such as cup ramen or instant yakisoba need to be resealed after pouring hot water into the unsealed container for cooking, so a lid that can be easily resealed is ideal.

The container for instant yakisoba needs to be able to pour out the hot water easily after the hot water is poured in, so the lid used has a tab for unsealing and a tab for forming an opening. The lid has a layered structure consisting of, for example, a plastic film, paper, aluminum foil, and a sealing film in this order from the top. The cover body is composed of an area with a material separation opening only on the aluminum foil and the sealing film, and other areas without openings; between the two areas, there is a hole-shaped connection only on the plastic film and paper. In areas with gaps, paper and foil are easily peeled off.

When eating instant fried noodles in a container with such a cover, first hold the flap portion for unsealing to unseal the cover to a predetermined position, pour hot water into the container and place the upper cover. Then, when the flap part for forming the material opening is lifted upward, the plastic film and paper in the cover body are peeled off from the aluminum foil while breaking along the perforated connection, and the material opening appears. Tilt the container to drain the hot water from the material opening, peel off all the remaining parts, and you can eat instant fried noodles. However, this cover not only has a complex layer structure with a material separation opening, but also requires perforated wiring to unseal only the part with a material separation opening, and there are also problems with the peelability of the release agent disposed between the paper and the aluminum foil. Adjustment is also very difficult and has a disadvantage of high cost.

As a cover body that can remove the complicated layer structure of the material partition part, for example, Japanese Patent Application Laid-Open No. 2002-160779 (Patent Document 2) proposes a plurality of pull tabs (pull tabs) protruding from the peripheral edge and engraved The two holes extending from the two sides of the root of each drawable tab to the inner side of the cover body are used for the opening of the two material-separating openings or the cover body with the function of material-separating half-cut grooves. However, in this cover body, a plurality of pullable flaps must be unsealed one by one, and there is a disadvantage that the formation of the material partition is troublesome.

Japanese Patent Application Laid-Open No. 2002-160758 (Patent Document 3) proposes a cover body having a material partition function as follows. In this cover body, a pull-out tab for unsealing and a pull-out tab for forming a material partition opening are arranged on the outer peripheral edge. On the opposite surface, in the vicinity of the drawable fins used to form the material separation opening, from both sides of the root of the fins, the first half of the groove is engraved in a wave shape on the surface of the cover, and close to the first half. Slot A second half-slot is engraved in a wave shape on the rear face of the cover. The valleys of the wave-shaped two half-cut grooves are located on the edge of the container body. Therefore, if the pullable tab used to form the material opening is lifted upwards, a plurality of material openings are formed by the first and second half-cut grooves.

But the lid body of Japanese Patent Application Laid-Open No. 2002-160758 also has the disadvantages of complex structure and high cost because there are two half-cut grooves on both sides. Moreover, the lid has a layer structure formed by laminating paper, aluminum foil, and polyethylene sealing film from the top, and static retention (the property that the lid is maintained in a raised state) can be obtained by utilizing the plastic deformation of the aluminum foil. Problems specific to aluminum. That is, the cover body with the aluminum foil has problems in incineration treatment after use, such as damage to the incinerator due to the high calorific value of the aluminum foil, and reduction in incineration efficiency due to fusion and integration. Therefore, from the viewpoint of environmental protection, it is desirable not to use a cover body having aluminum foil as much as possible. Therefore, even without using aluminum foil, it is desired to obtain a container for instant food that can easily keep the lid body in an unsealed state when pouring hot water.

Also, in order to improve the material separation performance of the lid container with the material separation function, when the container is tilted, it is hoped that the size of the material separation opening will be enlarged as much as possible within the range where the food in the container does not spill out; The size of the feed port will increase the resistance to tearing off. Therefore, it is desirable to obtain a cover body with a material-separating function that does not increase the tear-off resistance and widens the material-separating opening.

Patent Document 1: Japanese Unexamined Patent Publication No. 54-88490

Patent Document 2: JP-A-2002-160779

Patent Document 3: JP-A-2002-160758

Contents of the invention

Therefore, it is an object of the present invention to provide a container for instant food in which a sealed lid can be partially unsealed easily, and the strip-shaped flap portion formed by unsealing does not come off from the lid.

Another object of the present invention is to provide a low-cost container for instant food, the container has a sealed cover, and the cover has a flap portion for unsealing and a flap portion for forming a material separation port, not only It has good material separation performance, and can easily maintain the unsealed state of the lid body when hot water is injected.

Another object of the present invention is to provide a low-cost container for instant food, the container has a sealed lid, and the lid has a flap portion for forming a material separation opening, and the container is formed by forming a material separation opening. The flap portion of the lid is lifted upwards, and the lid can be easily peeled off from the container body.

As a result of earnest research for the above-mentioned purpose, the inventors of the present invention have found the following situation.

(A) One end of the lid of the airtight container body is provided with a flap for unsealing, and a tear starting point is formed on both sides of the flap portion for unsealing, on a straight line extending from the two tear starting points to the tearing direction , set a substantially U-shaped or arc-shaped half-cut groove for tearing stop that protrudes in the tearing direction, so that the tearing of the cover can be reliably stopped in the middle, and the strip flap can be prevented from falling from the cover. separate.

(B) On the lid body of the airtight container body, the flap part for unsealing and the flap part for forming the material partition are arranged on the position of the outer peripheral edge part, and the flap part for unsealing is provided with The protruding portion formed by the neck and the head, and a plurality of substantially U-shaped slits are set on the inner side of the fin portion forming the material opening, so that the open end faces inwardly, and the protruding portion of the unsealing fin portion is connected with a U The U-shaped slits are engaged with each other, and it is easy to maintain the unsealed state of the cover. In addition, if the flap part used to form the material opening is lifted up, the cover can be torn along the extension line of the U-shaped slit, thereby forming multiple Material opening.

(C) On one end of the cover body of the airtight container body, a fin part for forming the material separation port is provided, and a plurality of substantial U-shaped cracks are provided on the inner side of the fin part for forming the material separation port, so that Its open end faces inward, and if a pair of inclined straight lines whose distance becomes narrower toward the front is provided at the front end of each slit, the tearing of the cover body from each U-shaped slit will become easier.

The present invention is accomplished based on such inventions.

That is, the first instant food container of the present invention is characterized in that it has a container body for accommodating contents and a lid body that seals at its upper end flange portion; The tearing starting points on both sides of the unsealing flap part and the substantially U-shaped or arc-shaped tearing stop half-cut grooves protruding toward the tearing direction are formed from the two starting points on a straight line extending in the tearing direction.

The tearing starting point is preferably a slit or a notch provided on the outer peripheral edge of the lid.

The above-mentioned tearing stop half-cut groove is preferably located at a position beyond the center of the above-mentioned cover body; on each straight line extending from the above-mentioned tearing starting point along the tearing direction, it is better to set the half-cut groove for unsealing; the above-mentioned unsealing half-cut groove and The above-mentioned tear-stops are not connected as well with half-cut grooves.

The above-mentioned cover body is composed of a laminated sheet having at least a resin film, a paper sheet, and a heat-sealable film in order from above; Paper thin sheets as well. The depth of each of the half-cut grooves in the above-mentioned paper sheet is preferably at least a depth corresponding to about 30% of the thickness of the above-mentioned paper sheet. It is preferable that the half-cut groove for stopping tearing reaches approximately the bottom surface of the paper sheet.

The second container of the present invention for instant food that pours hot water after pouring hot water is characterized in that it is composed of a container body and a cover sealed on its upper end flange; On the top, there are provided a flap part for unsealing and a flap part for forming a material partition, the above-mentioned flap part for unsealing has a protruding part composed of a neck and a head, and the above-mentioned flap part for forming a material partition, It has a pair of linear slits and a plurality of substantially U-shaped slits provided between the pair of linear slits with the open ends facing inward, and the front ends of the linear slits and the U-shaped slits are located on the cover. In the sealing part of the body, the above-mentioned flap part for unsealing is lifted up, and the flap part is formed by partially unsealing the above-mentioned cover body. When one of the through-holes of the formed peeling part engages with each other, the flap part can be kept in an unsealed state.

In order to improve the engaging property with the above-mentioned protrusion, it is preferable that the structure for engaging with the above-mentioned protrusion in the above-mentioned U-shaped slit has one circumferential direction protrusion.

If the above-mentioned cover body has the linear part of the above-mentioned linear slit and the above-mentioned U-shaped slit and substantially parallel easy tearability, the above-mentioned cover body is peeled off from the above-mentioned container body by pinching the above-mentioned flap part for forming the material separation opening. When forming a plurality of material separation ports, the front end of the material separation port will not become too thin.

On the extension line of the said linear slit and the said U-shaped slit, it is preferable to provide the half-cut groove for forming a material partition opening in the said cover body. It is preferable that the front ends of the linear slit and the U-shaped slit are located outside the central line of the sealing portion of the lid. The position of the tip of the linear slit and the U-shaped slit in the sealing portion is preferably within a range from the outer periphery to 30% to 50% of the width of the sealing portion.

A tear stop mark is provided on the lid, and it is preferable to tear the lid from the container body to the stop mark while pinching the flap portion for forming the material partition.

In the second instant food container, at the front end of each U-shaped slit, it is better to have a pair of inclined line portions whose interval is narrower as it advances; A pair of slanted line portions whose distance is wider toward the front is preferable.

The above-mentioned lids of the first and second instant food containers are preferably composed of a laminated sheet having at least a resin film, a paper sheet, a rigid film, and a heat-sealable film from the top. At least one of the above-mentioned resin film, the above-mentioned rigid film, and the above-mentioned sealing film preferably has linear tearability.

It is preferable that the above-mentioned resin film has static holding properties. Utilizing the static holding property of the resin film, the flap portion formed by lifting up the flap and tearing the cover is maintained in a substantially lifted state (curled state).

When the above-mentioned resin film is bonded to the above-mentioned paper sheet under tension, and the above-mentioned cover is punched in such a way that the direction of the tension is the same as the direction of tearing, curling of the flap portion formed by unsealing the above-mentioned cover can be given. sex.

The aforementioned resin film is preferably composed of polybutylene terephthalate. The above-mentioned rigid film is preferably composed of a unidirectionally or bidirectionally oriented ethylene terephthalate film. The degree of orientation of the bidirectional orientation of the ethylene terephthalate film is preferably different.

Also, the features of the first container and the second container are not limited separately, for example, the features of the first container can be used for the second container, and vice versa.

The present invention also provides instant food contained in the first and second containers.

(invention effect)

In the first container for instant food in which the tearing stop half-cut groove is provided on a straight line extending in the tearing direction from the tearing starting point on both sides of the flap portion for unsealing, the flap portion formed by unsealing does not It will be separated from the cover body, which can realize partial unsealing at a certain distance. Furthermore, the flap portion can be easily closed by engaging the broken portion of the outer edge of the flap portion with the broken end portion of the opening portion. The container having such characteristics is suitable for instant foods such as instant noodles that are eaten after being filled with hot water.

In the container for the second instant food that has a flap part for forming a material partition formed by a plurality of U-shaped slits and a flap part for opening with a protrusion at the position of the opposite surface, the flap part for opening The protrusion of the flap part snaps into the U-shaped slit to easily keep the flap part in the unsealed state. If one protrusion in the circumferential direction is provided on the U-shaped slit, engagement between the protrusion of the opening tab and the U-shaped slit can be ensured. In addition, the tearability of the U-shaped slit can be improved by providing the inclined straight portion with narrowed intervals at the front end of the U-shaped slit. The container with such characteristics is suitable for instant foods such as fried noodles eaten after being filled with hot water.

The instant food container of the invention has the advantages of simple structure and low cost.

Description of drawings

Fig. 1 is a perspective view showing a container for instant food according to an embodiment of the present invention.

Fig. 2 is a plan view showing the container for instant food of Fig. 1 .

Fig. 3 is a perspective view showing an unsealed state of the container for instant food of Fig. 1 .

Fig. 4 is a plan view showing a cover body of another embodiment of the present invention.

Fig. 5 is a plan view showing a lid body of still another embodiment of the present invention.

Fig. 6 is an enlarged view showing the relationship between a straight line extending from a tear starting point and the axis of a half-cut groove for tear stop.

Fig. 7 is a plan view showing a cover body of still another embodiment of the present invention.

Fig. 8 is a perspective view showing a container for instant food according to still another embodiment of the present invention.

Fig. 9 is a plan view showing the instant food container of Fig. 8 .

Fig. 10(a) is an enlarged view showing the vicinity of the fin part for forming the material opening of the cover body of Fig. 8;

Fig. 10(b) is a partially enlarged view showing the unsealed state of the flap portion for forming a material opening in Fig. 10(a).

Fig. 11 is a perspective view showing an example of an unsealed state of the instant food container of Fig. 8 .

Fig. 12(a) is a partially enlarged view showing the vicinity of the flap part used for forming the material opening of the cover body of another other embodiment of the present invention; Fig. 12(b) is a partial enlarged view showing the formation of the material opening of Fig. 12(a) Partial enlarged view of the unsealed state of the used flap.

Fig. 13 is a partially enlarged view showing the vicinity of a fin portion forming a partition opening of the cover body in Fig. 12 .

Fig. 14 is a plan view showing a cover body of still another embodiment of the present invention.

Fig. 15 is a bottom view showing the cover of Fig. 14 .

Fig. 16 is a plan view showing an unsealed state of a flap portion for forming a compartment of the lid body in Fig. 14 .

Fig. 17 is a perspective view showing a container for instant food according to another embodiment of the present invention.

Fig. 18 is a perspective view showing a container for instant food according to another embodiment of the present invention.

Fig. 19 is a perspective view showing a container for instant food according to another embodiment of the present invention.

Fig. 20 is a plan view showing a container for instant food according to another embodiment of the present invention.

Fig. 21 is a plan view showing a container for instant food according to another embodiment of the present invention.

Fig. 22 is a cross-sectional view showing an example of the layer structure of the lid of the present invention.

Fig. 23 is a cross-sectional view showing another layer structure example of the lid body of the present invention.

Fig. 24 is a cross-sectional view showing yet another layer structure example of the lid of the present invention.

Fig. 25 is a cross-sectional view showing yet another layer structure example of the lid of the present invention.

Fig. 26 is a cross-sectional view showing the depth of half-cut grooves used in the present invention.

Fig. 27 is a cross-sectional view of a preferred example of the depth of the half-cut groove for tearing stop.

Fig. 28 is a cross-sectional view showing another example of the half-cut groove depth used in the present invention.

Fig. 29 is a cross-sectional view showing still another example of the depth of half-cut grooves used in the present invention.

Fig. 30 is a plan view showing a state in which a plurality of lids are punched from a laminated sheet.

Fig. 31 is a perspective view showing the unsealed state of the flap part for forming the material partition while resealing the container for instant food of Fig. 8 .

Fig. 32 is a perspective view of still another example of the unsealed state of the container for instant food of Fig. 8 .

Fig. 33 is a perspective view of still another example of the unsealed state of the container for instant food of Fig. 8 .

Detailed ways

Hereinafter, the present invention will be described in detail with respect to the first and second containers for instant foods, and it should be understood that the features of each container are also provided in other containers.

(A) cover body

(1) shape

(a) First container

1 to 3 show an example of the first container of the present invention. As shown in FIG. 1 , the first container is composed of a container body 1 for storing contents and a lid body 2 heat-sealed on an upper flange portion 1 a of the container body 1 . The lid body 2 has an unsealing tab portion 3 . The opening tab 3 is peeled off from the lid body 2 by pinching with fingers, so it should have a sufficient size.

On the outer peripheral edge portion of the lid body 2, tear starting points 4, 4 for facilitating the unsealing of the lid body 2 are provided on both sides of the unsealing tab portion 3. As shown in FIG. The tearing starting points 4, 4 can be cracks or notches. In this embodiment, a crack is taken as an example of a tear starting point 4, 4 for the following description.

The interval _d1 between a pair of cracks 4, 4 can be set as appropriate according to the type of content. For example, in the case of cup-shaped instant noodles filled with hot water, if the outer diameter of the upper flange portion 1a of the container body 1 is about 10 cm, the interval _d1 between the cracks 4, 4 is preferably about 4 to 8 cm. Also, in order to fully unseal the lid body 2 when eating, as shown in FIG.

As shown in FIG. 2, the front ends of the pair of slits 4, 4 are located at the sealing portion 11 of the lid 2 (the portion where the upper flange portion 1a of the container body 1 is heat-sealed) for sealing the contents.

The tolerance is about 1mm when the continuous laminated sheet is stamped and manufactured at high speed, so the front ends of the pair of slits 4, 4 are preferably closer to the outside than the central line 11a of the sealing portion 11 of the cover 2, preferably It is in the range of 30% to 50% of the width from the outer periphery to the seal portion 11 .

As shown in FIG. 2 , on the straight lines 4 ′, 4 ′ extending from the pair of slits 4 , 4 to the tearing direction, a substantially circular arc shape protruding toward the tearing direction is engraved on the upper surface of the cover body 2 . Or the half-cut groove 6,6 that U-shaped tearing stops usefulness. Here, the "substantially arcuate shape" should just be a curved shape. As shown in Fig. 3, the slit of the cover body 2 that can be torn with ordinary force can be reliably stopped by tearing the half-cut grooves 6, 6 used for stopping, so the strip flap portion 12 will not come off. If the strip-shaped flap portion 12 is detached from the container body 1, resealing of the lid body 2 becomes difficult.

As shown in FIG. 2, the half cut groove 6 for tearing stop is composed of a pair of straight parts 6a, 6a and an arc-shaped connecting part 6b connecting the straight parts when it is U-shaped. The interval d ₂ of a pair of linear portions 6a, 6a of the half-cut groove 6 used for U-shaped tearing stop is preferably between 4～14mm, preferably 6～10mm; the length _d3 of the linear portion 6a is between 2～10mm The distance is better, preferably 3-7mm. The pair of linear portions 6a, 6a do not necessarily have to have the same length. The radius of curvature of the arc-shaped connecting portion 6b is preferably between 2-7 mm, more preferably 3-5 mm. Again, when tearing the half-cut groove 6 that stops usefulness to be circular arc shape, its radius is good between 2～7mm, most preferably 3～5mm.

If the shape of the half-cut groove 6 for tear stop is other than U-shape or arc shape, sufficient tear stop capability cannot be obtained. For example, if the half-cut groove 6 for tearing stop is linear, the cover body 2 is torn from the end of the half-cut groove 6 when the crack reaches.

As shown in FIG. 4 or FIG. 5, the axes of the half-cut grooves 6, 6 for tearing stop can also be inclined relative to the extension lines 4', 4'. As shown in Figure 6, the axial inclination angle θ ₁ of each tearing stop half-cut groove 6 relative to each extension line 4' is preferably within 60 degrees, more preferably within 30 degrees.

In the example shown in Fig. 2, the center portions of the half-cut grooves 6, 6 for tearing stop are located on the extension lines 4', 4', but it is not necessarily limited to this. For example Fig. 4 and the occasion shown in Fig. 5 are outside, and as shown in Fig. 7, the front end of a side of the half cut groove 6 that each tear stops also can be positioned at the end of each extension line 4 '.

As shown in FIG. 2 , the half-cut grooves 6 and 6 for tearing stop are preferably located beyond the center line 40 of the cover body 2 , and are particularly preferably located near the sealing portion 11 .

As shown in Figure 2, in order to make the slit of the cover body 2 accurately reach the half-cut grooves 6, 6 used for tearing stop, from a pair of slits 4, 4 along the straight line 4', 4' extending in the tearing direction, It is better to engrave the half-cut grooves 7 and 7 used for unsealing from the top of the lid body 2 . The half-cut groove 7,7 that unsealing is used also can be connected with the half-cut groove 6,6 that tear stops usefulness, but in order to tear and stop reliably by tearing the half-cut groove 6,6 that stops usefulness, it is desirable to stop when tearing. The front end of the used half-cut groove 6,6. That is, it is preferable that the ends of the half-cut grooves 7, 7 for unsealing be separated from the half-cut grooves 6, 6 for tearing stop.

When the half-cut grooves 7 and 7 for unpacking are terminated before the half-cut grooves 6 and 6 for tearing and stopping, the front ends 7', 7' of the half-cut grooves 7 and 7 for unpacking and the half-cut grooves 6 for tearing and stopping The distance d ₄ of , 6 is preferably 1-10 mm, most preferably 2-5 mm. Also, as shown in FIG. 7, the ends of the half-cut grooves 7, 7 for unsealing may be connected to one end of the arc-shaped half-cut grooves 6, 6 for tearing stop use.

(b) Second container

8 to 11 illustrate an example of the second container of the present invention. In FIGS. 8 to 11 , the same components or parts as those in FIGS. 1 to 3 are given the same reference numerals. In this example, the cover body 2 has the flap part 3 for opening, and the flap part 5 for forming a material partition provided in the substantially opposing surface position.

As shown in Fig. 10(a), the fin part 5 for forming the material gap has a pair of linear slits 8a, 8b and a plurality of substantially equal intervals formed between the two linear slits 8a, 8b. U-shaped cracks 9, 9'. One U-shaped slit 9 is provided with one circumferential protrusion 9b. Each U-shaped slit 9' without a circumferential protrusion is composed of a pair of straight parts 9a', 9a' and a curved part 9b' connecting the two straight parts 9a', 9a'. Also, the U-shaped slit 9 having a circumferentially protruding portion is composed of a pair of linear portions 9a, 9a, a curved portion 9b connecting the two linear portions 9a, 9a, and a circumferentially protruding portion 9b” on a part of the curved portion 9b. The protrusion 31 of the unsealing tab 3 engages with the U-shaped slit 9 having the circumferential protrusion 9b ″ to keep the lid 2 unsealed.

There can usually be one U-shaped slit 9 having a circumferentially protruding portion 9b". Also, it is better to have 1 to 5 U-shaped slits 9', preferably 1 or 2. When a plurality of U-shaped slits 9 are provided ’, as shown in FIG. 9, it is better to be provided on both sides of the U-shaped slit 9 having the circumferentially protruding portion 9b".

As shown in Fig. 10(a), each U-shaped slit 9, 9' is formed with its open end facing inward. The shape of the substantially U-shaped slits 9, 9' is not particularly limited as long as it has an arc-shaped curved connection portion. The shape of the circumferentially protruding portion 9b" of the slit 9 is not limited to the circular arc shape as shown in FIG.

As shown in Fig. 10 (a), in order to fully ensure heat-tightness and can be easily torn from linear slits 8a, 8b and linear parts 9a, 9a', a pair of linear slits 8a, 8b and each U-shaped slit It is better that the front ends of 9 and 9' are all located in the sealing part 11 of the cover body 2.

Because the tolerance is about 1mm when the laminated sheet is stamped to manufacture the cover body 2 at high speed, the front ends of a pair of linear slits 8a, 8b and the front ends of each U-shaped slit 9, 9' are arranged at a lower position than the cover body. It is better that the central line 11a of the sealing portion 11 of 2 is close to the outside, preferably within the range of 30% to 50% of the range _D1 from the outer circumference to the sealing portion 11, and preferably located at the width D1 from the outer circumference to the sealing portion ₁₁ . range of 30% to 40%.

As shown in Fig. 10 (a), on the straight lines 43a, 43b, 44, 44' extending from the front ends of the straight parts of the linear slits 8a, 8b and the U-shaped slits 9, 9', engraved to form spacers. The half cut groove 71 that material mouth is used is as good. The tearing property of the lid body 2 can be improved by engraving the half-cut groove 71 for forming the material partition. It is better to separate the front ends of the half-cut grooves 71 used for the material-separating openings from the upper end flange by several centimeters. According to needs, on the front end of each half-cut groove 71 used for forming the material separation opening, the tearing direction can also be set as a convex U-shaped or arc-shaped half-cut groove for tearing stop use.

When the cover body 2 is formed of an easily tearable laminated sheet, it is preferable that the easy-tear direction and the tearing direction of the cover body 2 substantially match each other. Thus, when peeling off the cover body 2 by pinching the flap portion 5 used for forming the material opening, the cover body 2 runs along the front end of the pair of linear slits 8a, 8b and the front ends of the U-shaped slits 9, 9'. Easy tear direction, can be easily torn off in a straight line. Moreover, when the cover body 2 has easy-tearability, the half-cut groove 71 for forming the material partition can be omitted.

As shown in FIG. 9 , on the unsealing tab portion 3 , a protrusion portion 31 composed of a neck portion 31 a and a head portion 31 b is provided. As shown in FIG. 11, by engaging the protrusion 31 with the U-shaped slit 9 having the circumferential protrusion 9b", the unsealed state of the lid 2 can be easily maintained. As shown in FIG. 9 and protrusion 10 (a), If the widths _d5 , _d6 of the head 31b and neck 31a of the protruding part 31 and the maximum width of the U-shaped slit 9 having the circumferential protrusion 9b" are appropriately set (the width at the position where the circumferential protrusion 9b" ) d ₈ , the engagement between the protrusion 31 and the U-shaped crack 9 will be improved, and after the engagement, the protrusion 31 will not be easily detached from the U-shaped crack 9. If the two sides of the U-shaped crack 9 If there is the circumferential protrusion 9b", the protrusion 31 will fall off from the U-shaped slit 9 easily. As shown in FIG. 9 , curved portions 32 , 32 may be provided on both sides of the protrusion 31 in the unsealing tab portion 3 .

Specifically, the width _d5 of the head portion 31b is preferably 1 to 3 mm longer than the width _d6 of the neck portion 31a. The width _d8 of the connecting portion 9b is narrower than the width _d5 of the head portion 31b, and it is better to be above the width _d6 of the neck portion 31a, specifically, the width _d8 of the connecting portion 9b is narrower than the width _d5 of the head portion 31b 0.5 ~ 2mm is better. The width _d8 of the connecting portion 9b is preferably 0.5 to 2mm longer than the distance _d9 between the two linear portions 9a, 9a.

When the instant food in the container is fried noodles, the width d ₅ of the head 31b is 8-12mm; the width d ₆ of the neck 31a is 7-9mm; the width d ₈ of the connecting portion 9b is 8-10mm The interval d ₉ between the two straight parts of each U-shaped crack 9, 9' is preferably 7-9mm; the interval d ₁₀ between the linear crack 8a and the U-shaped crack 9', the straight crack 8b and the U-shaped crack 9 The distance d ₁₀ between ' and the distance d ₁₁ between the U-shaped cracks 9 and 9' are preferably 3 to 6 mm.

In the embodiment shown in Figs. 8 to 11, the distance d ₇ between the pair of slits 4, 4 provided on both sides of the opening tab 3 can be set as appropriate according to the type of content. For example, in the case of cup-packed ramen that injects hot water, if the outer diameter of the upper flange portion 1a of the container body 1 is about 18 cm, the interval d ₇ between the cracks 4 and 4 is set between 9 and 15 cm. good.

As shown in Fig. 8 and Fig. 9, it is advisable to set the mark 10 representing the peeling limit on the position where the instant food (fried noodles, etc.) in the container does not leak out and the hot water can be discharged efficiently; , It is advisable that the length of the opening 15 that can be set to be about 1～5cm.

If pinching the fin portion 5 used to form the material opening, if only the portion 13 indicated by hatching is peeled off from the container body 1 on the cover 2, as shown in Figure 10 (b), multiple The material partition 15 and the strip parts 14, 14' extended from the respective U-shaped slits 9, 9' are sealed to the upper flange part 1a of the container body 1.

(c) Other examples of second containers

Fig. 12 shows other examples of the second container. In this example, except that the front ends 9c, 9c' on the straight parts 9a, 9a' of the U-shaped slits 9, 9' are composed of straight lines with narrowed intervals, and the front ends 81a of the pair of linear slits 8a, 8b , 81b are the same as the examples shown in FIGS. As shown in FIG. 12, in this example, one flap portion 51 for unsealing may be provided beside the flap portion 5 for forming each spout.

In order to shorten the time for pouring clean hot water, it is better to set the width d ₁₃ , d ₁₃ ′ of the material separation port 15 as wide as possible, but in this case, the area of the cover part peeled off from the sealing part 11 will become larger, Kaifeng resistance will also become larger. The unsealing resistance is greatest at the beginning of peeling, and when the peeling area with the sealing portion 11 becomes larger, a large initial resistance will be felt. Therefore, as shown in FIG. 12(a), if the front ends of the linear slits 8a, 8b and the U-shaped slits 9, 9' are provided with an inclined linear portion 9c so that the peeling area of the sealing portion 11 gradually becomes larger, , 9c', 81a, 81b, then the relatively large initial resistance will not be felt, and the unsealing of the flap portion 5 for forming the material separation opening can be performed smoothly.

The length of each front end straight portion 9c, 9c', 81a, 81b is preferably between 0.5mm and 3mm. As shown in Fig. 13, the angle θ ₂ between each front end straight portion 9c, 9c', 81a, 81b and straight portion 9a, 9a', 8a, 8b is preferably between 120°-170°. If the angle θ ₂ is outside this range, then from each straight front end portion 9c, 9c', 81a, 81b along the half-cut groove 71 (replacing the half-cut groove 71, when there is easy tearability) Easy to tear direction) there is a danger that it cannot be torn in a straight line. In addition, the angle _θ2 does not have to be completely the same between the respective front end straight portions 9c, 9c', 81a, 81b and the respective straight portions 9a, 9a', 8a, 8b. Moreover, each front-end|tip part 9c, 9c', 81a, 81b may be curved line instead of a straight line.

The distance _d12 between the front ends of the front ends 9c, 9c (9c', 9c') is preferably 0.5-3mm narrower than the distance _d9 between the two straight parts of the U-shaped slit 9 (9'). Specifically, when the instant food in the container is fried noodles, the distance d ₁₂ between the front ends of the front ends 9c, 9c (9c', 9c') is preferably between 6-8mm, and the width d ₁₃ of the opening 15 , d ₁₃ ' is preferably between 4 and 7 mm.

The positions in the sealing portion 11 at the front ends of the front ends 9c, 9c', 81a, 81b also satisfy the above-mentioned conditions related to the positions of the front ends of the linear slits 8a, 8b and the U-shaped slits 9, 9'.

(d) Other examples

The shapes of the lids in the first and second containers are not limited to those shown in the drawings, and various changes can be added as long as the gist of the present invention is not changed. For example, FIGS. 14 to 16 show an example in which a spacer function is provided to the lid of the first container. In Figs. 14-16, the same components or parts as those shown in Figs. 1-3 are given the same reference signs.

In the example shown in FIG. 14 , the fin portion 105 for forming the material partition is separated from the cover body 2 by the half-cut groove 72 . The half-cut groove 72 is composed of a pair of straight parts 72a, 72a extending from both sides of the fin part 105 for forming the material partition to the inside of the cover body 2, and a connecting part 72b between the two straight parts 72a, 72a. As shown in FIG. 15 , in the region (shown by cross-hatching) 17 surrounded by the half-cut grooves 72 , a plurality of half-cut grooves 73 for forming material separation openings are provided on the quilt surface of the cover body 2 .

When the cover is composed of a laminated sheet with an outer layer and an inner layer on the paper sheet, in the examples shown in FIGS. The half-cut groove 73 only runs through the inner layer. In the region 17 surrounded by the half-cut groove 72, a release layer is formed on the inner surface of the paper sheet. Therefore, if the flap portion 5 for forming the material opening is lifted upward, the area 17 surrounded by the half-cut groove 72 is peeled off from the inner layer, and the inner layer portion corresponding to a plurality of material openings is also removed. Therefore, As shown in Fig. 16, a plurality of material separation openings 15 have appeared. Also, in the example shown in FIG. 14, the half-cut groove 72 may be U-shaped or square.

FIG. 17 shows a container having a lid body 2 provided with a slit-shaped through-hole 34 at a position corresponding to the outer edge of the upper end flange portion 1a of the unsealing flap portion 3 . This container is the same as the first container except for the slit-shaped through-hole 34 . In this container, when the unsealed lid body 2 is returned to the closed position, the upper end flange portion 1a is engaged with the slit-shaped through-hole 34, thereby improving resealability. As an alternative to the slit-shaped through-hole 34 , slits may also be provided.

FIG. 18 shows a container in which a slit-shaped through-hole 34 and other fin portions 115 are provided in the lid body 2 . This container is the same as the first container except for the slit-shaped through-hole 34 and the fin portion 115 . By engaging the tab portion 115 with the slit-shaped through-hole 34 , the lid body 2 can be kept unsealed.

19-21 have shown the situation when the container body 1 is a cuboid. In FIG. 19 , the lid body 2 is substantially square, and a tab portion 3 for opening and a tab portion 5 for forming a material opening are provided at substantially diagonal corners. In Fig. 20, at the approximate center of one short side of the rectangular cover body 2, a flap portion 3 for unsealing is provided; at the approximate center of the other short side, a flap portion for forming a material opening is provided. 5. In Fig. 21, at the approximate center of one long side of the rectangular cover body 2, a flap portion 3 for unsealing is provided; at the approximate center of the other long side, a flap portion for forming a material opening is provided. 5.

(2) Layer structure of laminated sheet for cover

22 to 25 illustrate preferred layer structures of the cover body 2 . The cover body 2 is formed by providing an outer layer 2 a and an inner layer 2 b on a paper sheet 21 . In the example shown in FIG. 22, the outer layer 2a has a resin film 22 on the outermost layer, and the inner layer 2b has a rigid film 23, a light-shielding ink layer 24, and a sealing film 25 sequentially from the paper sheet 21 side. Between the resin film 22 and the paper sheet 21, between the paper sheet 21 and the rigid film 23, and between the light-shielding ink layer 24 and the sealing film 25, there are adhesive layer 26 and extrusion delamination respectively. The adhesive layer 27 made of the polyethylene layer 27. The adhesive layer may consist of only the polyethylene layer 27 .

The example shown in Fig. 23 is the same as the example shown in Fig. 22 except that the inner layer 2b does not have the rigid film 23. The example shown in FIG. 24 is the same as the example shown in FIG. 23 except that an aluminum foil 28 is used instead of the light-shielding imparting layer and the light-shielding ink layer 24 of the inner layer 2b. The example shown in FIG. 25 is the same as the example shown in FIG. 22 except that the resin film 22 and the rigid film 23 alternate.

Each layer will be described in detail below.

(a) Resin film

In the lid body 2 of the present invention, a resin film 22 is provided as a layer for imparting gas barrier properties and the like. Examples of the material of the resin film 22 include polyester, polypropylene, nylon, and the like. When a polyester film is used, it is possible to obtain a cap particularly excellent in fragrance retention or gas barrier properties. When a polypropylene film is used, a cover with excellent moisture retention can be obtained.

Examples of polyester films include polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene naphthalate Films made of butanediol formate (PBN), etc. PBT films and PET films are available at low prices as commercial items. In particular, the PBT film is excellent in dead hold, fragrance retention, gas barrier and heat resistance, so it is preferable.

PBT film is a saturated polyester film composed essentially of 1,4-butanediol and terephthalic acid. However, diol components other than 1,4-butanediol or carboxylic acid components other than terephthalic acid may be contained as copolymerization components within a range that does not affect physical properties such as heat shrinkability. Examples of such diol components include ethylene glycol, diethylene glycol, neopentyl glycol, 1,4-cyclohexanemethanol and the like. Moreover, as a dicarboxylic acid component, isophthalic acid, sebacic acid, adipic acid, azelaic acid, succinic acid etc. are mentioned, for example. As a specific example of the PBT resin which comprises a PBT film, the homopolymer PBT resin marketed by Toray Co., Ltd. under the brand name "Trecon" is mentioned, for example.

PET film is a saturated polyester film basically composed of ethylene glycol and terephthalic acid. However, a diol component other than ethylene glycol or a carboxylic acid component other than terephthalic acid may be contained as a copolymerization component within a range that does not affect the properties of the PET film. Examples of such diol components include diethylene glycol, 1,4-butanediol, neopentyl glycol, 1,4-cyclohexanemethanol and the like. Moreover, as a carboxylic acid component, isophthalic acid, sebacic acid, adipic acid, azelaic acid, succinic acid etc. are mentioned, for example. PET films are generally sold as biaxially oriented films, for example, "Lumira" of Toray Co., Ltd., "Toyobo Ester Film" of Toyobo Co., Ltd., "Embret PC" of Unichika Co., Ltd., etc. .

The polyester film is not limited to a material composed of only a single resin component, but may be composed of a plurality of resin components. As a combination of resin components, in addition to a combination of a plurality of polyester resins, a material in which other thermoplastic resins are added to one or two or more polyester resins within the range not to impair the properties thereof can be mentioned. Examples of other thermoplastic resins include polyphenylene sulfide (PPS), polyamide (PA), polyimide (PI), polyamideimide (PAI), polyethersulfone (PES), polyetheretherketone (PEEK), polycarbonate, polyurethane, fluorine-containing resin, polyolefins such as polyethylene and polypropylene, polyvinyl chloride, thermoplastic elastomer, etc. For example, when a PBT film is used as the resin film 22, if the PBT resin used as a film raw material contains polyethylene, the film-forming properties during film production can be improved, and a PBT film with excellent uniformity of film thickness can be obtained. When other thermoplastic resins are contained, the ratio is preferably 5 to 20% by mass based on 100% by mass of the entire polyester film, more preferably 5 to 15% by mass, particularly preferably 5 to 10% by mass . Therefore, unless otherwise specified, the terms "PET film" and "PBT film" used in this specification should be understood to refer not only to single-component materials such as PET or PBT, but also to include combinations of PET or PBT+other thermoplastic resins. things.

Depending on the purpose of the container for instant food, the resin film may appropriately contain stabilizers such as plasticizers, antioxidants or ultraviolet absorbers, antistatic agents, surfactants, colorants such as dyes or pigments, and materials for improving fluidity. Additives such as lubricants and inorganic fillers.

From a practical point of view, the thickness of the resin film 22 is preferably about 5 to 50 μm. It is technically difficult to make the thickness of the resin film 22 less than about 5 μm. In addition, when the thickness of the resin film 22 exceeds about 50 μm, the tearability of the cover body 22 decreases. Preferably, it is 10 to 30 μm. A PBT film with a thickness of about 5-50 μm has sufficient static retention, fragrance retention and gas barrier properties.

The thermal shrinkage rate of the PBT film is preferably 2% or less in both MD (machine direction) and TD (width direction). Thermal shrinkage was measured by heating the PBT film at 150°C for 10 minutes. A PBT film with a thermal shrinkage rate of 2% or less can be produced by air-cooled inflation molding. As a method for producing a PBT film by an air-cooled inflation molding method, for example, the method described in WO 2004/026558 can be cited.

In order to facilitate the tearing of the cover body 2 , it is preferable to use one having unidirectional tearability as the resin film 22 . As the film having easy tearability in one direction, it is preferable to use a polyester film with one-way orientation or two-way orientation with different degrees of orientation. Biaxially oriented PET films having different degrees of orientation are commercially available as [Embret PC] (Unicika Co., Ltd.). As will be described later, in order to impart linear tearability to the resin film 22, a plurality of substantially parallel linear traces and/or a plurality of micropores may be formed.

(b) Paper flakes

The cover body 2 has a paper sheet 21 as a static holding imparting layer. The kind of paper is not limited, and synthetic paper is included. The weight per unit area of the paper sheet 21 is preferably about 60 to 110 g/m ² , more preferably about 75 to 90 g/m ² . If the weight per unit area of the paper is less than about 60 g/m ² , the stiffness of the paper will be too weak, and sufficient static holding properties cannot be imparted. On the other hand, if the weight per unit area of the paper exceeds about 110 g/m ² , only an increase in cost will be caused, and the static holding property will not be further improved.

(c) Rigid film

In order to increase the rigidity of the lid body 2, a rigid film 23 may be provided. As the rigid film 23, a PET film is preferably used. In order to improve the tearability of the cover body 2, it is preferable to use a monodirectionally oriented PET film or a bidirectionally oriented PET film having a different degree of orientation (for example, the aforementioned (Enbreit PC)) as the PET film. In order to improve the tearability of the cover body 2 , a plurality of substantially parallel linear traces and/or a plurality of microscopic holes may be formed on the rigid film 23 .

(d) Light-shielding imparting layer

In order to prevent deterioration of instant food due to sunlight or ultraviolet rays, the cover body 2 has a light-shielding ink layer 24 or an aluminum foil 28 . The light-shielding ink is not particularly limited as long as it contains black or dark pigments or dyes such as graphite. The light-shielding ink layer 24 has the advantage of not polluting the environment during incineration, and also has the advantage of being able to use metal detectors to detect whether there are metal foreign objects in the sealed container. Therefore, not only the safety of the convenience food is further improved, but also the inspection cost can be significantly reduced by using the metal detector. Aluminum foil 28 has excellent light-shielding properties, gas barrier properties, and fragrance retention properties.

The thickness of the light-shielding ink layer 24 depends on the concentration of the black pigment or dye in the ink, but generally, it is sufficient to block ultraviolet rays and visible light. The thickness of the aluminum foil 28 is preferably 3-15 μm, most preferably 7-12 μm.

(e) heat sealing layer

The heat-sealing layer at the upper flange portion 1a of the container body 1 is a sealing film 25 or a heat-melt layer. The sealing film 25 can be formed of polyethylene film, non-stretched polypropylene film, ionomer resin film, polystyrene, or the like. In addition, in order to allow the lid body 2 to be easily peeled off from the container body 1, it is preferable that the sealing film 25 has easy peelability. Therefore, it is preferable that the sealing film 25 has weak thermal adhesiveness; a known one can be used for the thermal melt layer.

As the sealing film 25, a laminated sheet having, for example, a polyethylene base film and a low molecular weight polyethylene film in this order from the paper sheet 21 side can be used. The thickness of the polyethylene base film is preferably about 10-40 μm, most preferably about 20-30 μm. Also, the thickness of the low-molecular-weight polyethylene film is preferably about 5 to 20 μm, more preferably about 7 to 15 μm. Such a laminated polyethylene film is commercially available, for example, as 760FD (manufactured by Toray Gosei Film Co., Ltd.). Moreover, as the sealing film 25, the film which consists of the mixture of ethylene-vinyl acetate copolymer (EVA) and polyethylene can also be used. In the film composed of this mixture, linear low-density polyethylene (LLDPE) is preferably used as polyethylene. The thickness of the film made of the mixture is preferably about 10-40 µm, more preferably about 20-30 µm. Also, the thickness of the hot-melt layer is preferably between 10-50 μm, more preferably 20-40 μm.

The sealing film 25 can be formed of a sealing film (JP-A-2004-26190) composed of a resin composition containing a linear ethylene·α-olefin copolymer [density (JIS K6922): 0.870 to 0.910 g /m ³ , MFR (JIS K6921, 190°C, 2.16kg load): 1 to 100g/10min] and polystyrene; the above-mentioned linear ethylene·α-olefin copolymer is formed by ethylene and carbon number 3 to 18 α-olefin obtained by copolymerization. The lid body 2 having the heat-sealing layer made of the sealing film can ensure airtightness and easy-openability when used for heat-sealing the container body 1 .

In order to provide the cover body 2 with superior straight-line tearability, a plurality of substantially parallel linear traces and/or a plurality of fine holes may be formed on the sealing film 25 .

(3) Depth of half-cut groove

FIG. 26 illustrates a cross section of a portion where the half-cut groove 6 for tearing stop, the half-cut groove 7 for unsealing, or the half-cut groove 71 for forming a material barrier is provided in the lid body 2 . Also, in FIG. 26, the same components or parts as those of the embodiment shown in FIG. 22 are given the same symbols. It is good to tear the half-cut groove 6 that stops usefulness, the half-cut groove 7 that unpacks usefulness and the half-cut groove 71 that forms material separation mouth usefulness to reach paper thin sheet ₂₁ at least from the top of laminated sheet 20; The depth _D2 corresponds to at least about 30% of the thickness _D3 of the paper web 21 .

As shown in FIG. 21 , the half-cut groove 6 used for tearing stop preferably can reach approximately the bottom surface of the paper sheet 21 . The ability to stop tearing can be further improved by making the half-cut groove 6 for tear stop substantially reaching the bottom surface of the paper sheet 21 .

However, if the half-cut grooves 6 for tearing stop, the half-cut grooves 7 for unsealing, and the half-cut grooves 71 for forming a material partition penetrate into the rigid film 23, the rigidity of the lid body 2 will become too low. Moreover, if these half-cut grooves penetrate into the light-shielding ink layer 24 or the aluminum foil 28 (see FIG. 24 ), the light-shielding properties will be deteriorated.

FIG. 28 illustrates a cross-section of a portion where the half-cut groove 72 and the half-cut groove 73 for forming a material opening are provided in the cover body 2 shown in FIGS. 14 to 16 . In this example, (1) the half-cut groove 73 for forming the material separation opening is formed from the back side of the laminated sheet 20, and (2) except that a peeling layer 29 is provided on the inner surface of the paper sheet 21, it is the same as the example shown in FIG. 27 . Therefore, in FIG. 28, the same components or parts as those of the example shown in FIG. 27 are given the same reference numerals. Region 17 can be easily peeled off from inner layer 2b along half-cut groove 72, and at this moment, can also be removed together with the cover body part that is equivalent to material separation opening by half-cut groove 73, so occurred a plurality of material separation openings 15 (referring to Figure 16).

FIG. 29 shows another example of the cross-section of the portion where the U-shaped half-cut groove 72 and the half-cut groove 73 for the material partition opening are provided in the cover body 2 shown in FIGS. 14 to 16 . This example is the same as the example of FIG. 28 except that the inner layer 2 b does not have the rigid film 23 and the light-shielding ink layer 24 but has the aluminum foil 28 .

(4) Preprocessing of each film

(a) Formation of linear traces

In order to further improve the tearability of the cover body 2 , on at least one of the resin film 22 , the rigid film 23 and the sealing film 25 , a plurality of substantially parallel linear traces can be formed according to the following method.

In order to combine film strength and good linear tearability, the depth of the linear marks is preferably 1-40% of the thickness of each film, specifically 0.1-10 μm. The width of the linear traces is preferably in the range of 0.1 to 10 μm, and the interval between the linear traces is preferably in the range of 10 to 200 μm.

In order to form the linear traces on the respective films 22, 23 and 25, for example, the method disclosed in WO 03/091003 can be used. In this method, on the surface of a roll or a metal plate with a plurality of tiny particles with a Mohs hardness of 5 or more, a plurality of substantially parallel lines can be formed on the film by sliding the continuously running film while pressing. trace. As the fine particles, it is preferable to use diamond fine particles. As a mechanism for pressing the film onto a roll or a metal plate, an air jet mechanism or a brush that slides on the film may be used. Since the linear marks obtained by this method do not penetrate the film, even if the polyester film on which the linear marks are formed is used as the resin film 22 , sufficient fragrance retention and gas barrier properties can be ensured.

It is preferable that the linear marks are integrally formed on at least one surface of the films 22 , 23 , and 25 . Thereby, regardless of the orientation of the film itself, each of the films 22, 23, and 25 is given linear tearability in one direction, and can be torn linearly from any position along the linear trace.

(b) Formation of micropores

In order to improve the tearability of the cover body 2, a plurality of fine holes may be formed over the entire surface of at least one of the resin film 22, the rigid film 23, and the sealing film 25 by the following method.

The micropores preferably have an average opening diameter of 0.5 to 100 μm and a distribution density of about 500 pores/cm ² or more. If the distribution density of micropores is less than about 500 pores/cm ² , tearability will be insufficient. From the viewpoint of film strength, the distribution density of micropores is preferably 1×10 ³ to 1×10 ⁴ /cm ² , most preferably 1×10 ³ to 5×10 ³ /cm ² .

Micropores can be formed in each thin film, for example, by methods disclosed in Japanese Patent No. 2063411 and Japanese Patent Application Laid-Open No. 2002-59487. For example, in the method disclosed in Japanese Patent No. 2063411, a plurality of first rolls (the same as the rolls used to form the above-mentioned linear traces) with a plurality of acute-angled parts and Mohs hardness particles of 5 or more are attached on the surface and the surface is smooth. The film passes between the second rollers while receiving an equal pressing force, so many microscopic holes can be formed on the film. As the second roll, iron rolls, stainless steel rolls, special steel rolls, etc., which have been plated with nickel or chrome, can be used.

When micropores are formed in the sealing film 25, the micropores may be through holes or non-through holes. In the case where the resin film 22 or the rigid film 23 is provided with fine holes, the fine holes are preferably non-through holes from the viewpoint of the airtightness of the container. By adjusting the pressing force between the first roll and the second roll, one or both of the through hole and the non-through hole can be formed.

(B) Container body

The container body 1 can be formed of synthetic resin such as paper, foamed styrene, or the like. In the case of the container body made of paper, not only is it easy to incinerate, but it also has the advantage of not generating exhaust gas that pollutes the environment during incineration. In addition, when the container body is made of foamed styrene, there is an advantage of excellent heat retention. The shape of the container body 1 is not limited to that shown in the figure, and can be varied in many ways depending on the type of contents.

[2] Manufacturing method of the cover body

(A) Manufacturing method of laminated sheet

For example, in the case of forming a laminated sheet 20 as shown in FIG. 22, an adhesive layer is formed on both sides of a strip paper sheet 21, a resin film 22 is laminated on one side, and a rigid film 23 and a rigid film 23 are laminated on the other side. A laminated sheet formed of the light-shielding ink layer 24 and the sealing film 25 . On each film 22 , 23 or 25 , a plurality of substantially parallel linear traces and/or a plurality of microscopic holes may be provided in advance as required. The easy-tear direction of each of the films 22 , 23 , and 25 is aligned with the longitudinal direction of the elongated paper sheet 21 .

In the case where the resin film 22 is laminated on the paper sheet 21, the resin film 22 is bonded to the paper sheet 21 in a state stretched in the MD direction within the elastic deformation region (1 to 3% elongation) of the resin film 22. Paper thin sheet 21 on as well. This imparts rollability to the laminated sheet 20 .

For stretching by 1 to 3%, it is only necessary to apply a tension of 10 to 20 kgf/m to the resin film 22 . When the resin film 22 is adhered to the paper sheet 21 without stretching, the tension applied to the resin film 22 is 5 kgf/m or less. PBT is more suitable as a resin capable of elastic deformation and stretching.

The laminated sheet 20 bonded to the paper sheet 21 while applying tension to the resin film 22 has reverse curling on the resin film 22 side, so the resin film 22 is rolled back outward. As a result, the laminated sheet 20 does not actually curl when being rolled back (of course, the laminated sheet 20 is curled most of the time). Since the laminated sheet 20 remains temporarily flat, there is no hindrance to the pressing/heat sealing work to the lid body 2 . When the heat-sealed lid body 2 is peeled off from the container body 1, the lid body 2 will be in a curled state.

In the case of using PBT as the resin film 22, the laminated sheet 20 can have the function of memorizing the curl shape by utilizing the shape memory property of PBT. For example, adopt 2 kinds of methods that disclose among WO 2004/026577, can manufacture the PBT laminated sheet 20 with memory curl shape function.

In the first method, (a) the laminated sheet 20 comprising a PBT film is subjected to shaping treatment (cold working) at a temperature T1 below the glass transition temperature _Tg of PBT while maintaining a curled shape; (b) Under the temperature _T2 , the shaped laminated sheet 20 is deformed into a flat shape; (c) it is formed by cooling to a temperature _T3 below Tg and fixing it into a flat shape. The second method is (a) (i) keeping the laminated sheet 20 comprising a PBT film in a curled shape while performing shaping treatment at a temperature exceeding Tg to less than the melting point temperature _T4 , or (ii) holding The PBT film is kept in a crimped shape while performing shaping treatment at a temperature of _T4 , and then, by laminating the film laminate comprising the paper sheet 21 (the layer constituting the inner layer 2b when the laminated sheet 20 is formed+the paper sheet 21 composition) to produce a laminated sheet 20 having a curled shape; (b) cooling the shaped laminated sheet 20 to a temperature _T5 below Tg to fix the curled shape; (c) forming the shaped laminated sheet 20 It is deformed into a flat shape at a temperature _T6 exceeding Tg to less than _T4 ; (d) cooled to a temperature _T7 below Tg and fixed into a flat shape. The shape-memory PBT laminated sheet 20 produced by these methods is flat, but the subsequent stamping and heat-sealed lid body 2 returns to curling, so when it is peeled off from the container body 1, curling occurs.

(B) Stamping/half-cut processing

As shown in FIG. 30, if the laminated sheet 20 is placed on top of the resin film 22, and punching/half-cutting is performed with a plurality of punches, a plurality of lids 2 can be produced at one time. Pressing/half-cutting itself can be performed by a known method. Make a pair of slits 4, 4, a pair of linear slits 8a, 8b, U-shaped slits 9, 9', and the half-cut direction connecting these slits coincide with the long side direction of the strip-shaped paper sheet. Stamping and half-cutting can be performed simultaneously or consecutively.

(C) Heat sealing to the container body

A case where heat sealing is performed after forming the lid body 2 will be described as an example. After the contents (such as dry noodles, powdered soup and edible utensils, etc.) , for heat sealing. Since easy peelability is imparted, the heat-sealing temperature is preferably in the range of 120 to 160°C.

Of course, after the preliminary half-cutting process, the stamping process of the laminated sheet 20 and the heat sealing of the container body 1 can be performed simultaneously. In particular, the PBT laminated sheet 20 having a shape memory function returns to its curled shape by the action of heat when it is heat-sealed, so it is better to perform the stamping process and the heat-sealing of the container body 1 at the same time.

[3] Convenience foods in containers and the order of consumption

Convenience foods suitable for the first container include cup-packed ramen noodles, powdered stew ingredients, powdered or fluid miso sauce or rice cake adzuki bean soup powder or soup stock, beverages such as orange juice, etc. Taking the cup ramen among them as an example, the order of consumption will be explained below.

Cup ramen is to put dry noodles (or fried noodles) 42, powdered soup or liquid soup in a small bag, and edible utensils (or utensils in a small bag) into a bottomed cylindrical container made of paper. In the main body 1, the lid body 2 is heat-sealed at the upper end flange portion 1a of the container main body 1. As shown in FIG.

First, if the flap part 3 for unsealing of the lid body 2 is pinched and pulled, the lid body 2 can be torn from the cracks 4, 4 along the half-cut grooves 7, 7 for unsealing to the half-cut grooves 6, 6 for tearing stop. An opening 41 is formed in the cover body 2 . When the cover body 2 is made of a PBT film, the strip-shaped flap portion 12 formed by tearing has sufficient static holding properties and can maintain the curled state. Therefore, what is necessary is just to inject boiling water directly from the opening part 41. FIG.

After injecting hot water, if the strip-shaped flap portion 12 is restored to its original position, the zigzag-shaped broken portions 12 ′, 12 ′ on both sides of the strip-shaped flap portion 12 and the zigzag-shaped broken portion 41 ′ of the opening 41 , 41' are engaged to maintain the strip-shaped flap portion 12 in a closed state, therefore, the strip-shaped flap portion 12 does not need to be pressed. After the cooking time, the lid body 2 is completely peeled off, and the ramen can be eaten.

Convenience foods suitable for use in the second container are chow mein. Taking the fried noodles in cups as an example, the order of consumption will be explained below. When using the container shown in FIG. 8, as in the case of cup ramen, after forming the opening 41 on the lid body 2, the protrusion 31 of the strip-shaped flap portion 12 formed by tearing and forming the partition When the U-shaped slit 9 of the flap portion 5 for the mouth is engaged, the strip-shaped flap portion 12 is maintained in an unsealed state.

Inject hot water, return the strip-shaped flap portion 12 to the lid-closed position, and after holding it for, for example, 3 minutes, pinch the flap portion 5 used to form the material opening, and peel the lid body 2 from the container body 1 to the mark. 10 places. Although the section line part 13 shown in Fig. 10 (a) is peeled off together with the fin part 5 used for forming the material opening, each strip part 14, 14' and the container body 1 are closely attached together, so as shown in Fig. 31 As shown, a material separation port 15 is formed. If the width of each material separation port is set to 4-7mm, and the length is set to 1-5cm, then the fried noodles softened in the material separation port will not be discharged from the material separation port 15. After the cover body 2 is completely peeled off, the fried noodles can be eaten.

Also, instead of engaging the protrusion 31 at the front end of the belt-shaped flap portion 12 with the U-shaped slit 9, it may also be engaged with the through hole 33 of the peeling portion 13 formed by forming the partition opening 15. on one of the . At this time, as shown in FIG. 32 , the protrusion 31 may be engaged with the through hole 33 from the front side, or may be engaged with the through hole 33 from the rear side as shown in FIG. 33 .

Although the present invention has been described with reference to the drawings, it is not limited thereto, and various changes can be added as long as the gist of the present invention is not changed.

Claims (27)

1, a kind of container for fast food is characterized in that:

Have the vessel and the leak free of the flange part implementation in the top lid of accommodating content; Above-mentioned lid, have Kaifeng with tab portion, be arranged on above-mentioned Kaifeng with the tab portion both sides tearing starting point and since two starting points and stopping to use the hemisection groove to the U font or circular-arc the tearing of the essence of tearing the direction protrusion along tearing the straight line formation that direction extends.

2, container for fast food according to claim 1 is characterized in that, tears starting point, is crack on the peripheral edge portion that is arranged on above-mentioned lid or indentation.

3, container for fast food according to claim 1 and 2 is characterized in that, above-mentioned tearing stops to use the hemisection groove, is positioned at the position at the center that surmounts above-mentioned lid.

4, according to any described container for fast food in the claim 1～3, it is characterized in that, begin from above-mentioned crack also to be provided with Kaifeng hemisection groove along each straight line of tearing the direction extension.

5, container for fast food according to claim 4 is characterized in that, above-mentioned Kaifeng stops with the hemisection groove distance that separates a little being arranged with the front end of hemisection groove with above-mentioned tearing.

According to claim 4 or 5 described container for fast food, it is characterized in that 6, above-mentioned lid is by constituting from the top lamination thin slice that has resin film, paper sheet and heat seal film in turn at least; Above-mentioned tearing stops to arrive at least on the above-mentioned paper sheet in the above-mentioned lamination thin slice with hemisection groove and above-mentioned Kaifeng hemisection groove.

7, container for fast food according to claim 6 is characterized in that, above-mentioned on the above-mentioned paper sheet tears and stop with hemisection groove and the above-mentioned Kaifeng degree of depth with the hemisection groove, is equivalent to about 30% the degree of depth of above-mentioned paper sheet thickness at least.

8, according to claim 6 or 7 described container for fast food, it is characterized in that, above-mentioned stop to tear use the hemisection groove, roughly arrive the bottom surface of above-mentioned paper sheet.

According to any described container for fast food in the claim 1～8, it is characterized in that 9, above-mentioned lid except tab portion is used in above-mentioned Kaifeng, also has the tab portion that forms separated material mouth usefulness; The tab portion of above-mentioned formation separated material mouth usefulness, have pair of straight wire crack and between above-mentioned pair of straight wire crack, be provided with the open end towards the U of a plurality of essence of inboard font crack; Each U font crack is made of with U font that is connected two line parts or circular-arc connecting portion a pair of line part; The front end in above-mentioned linearity crack and above-mentioned U font crack all is positioned at the sealing of above-mentioned lid.

10, container for fast food according to claim 9, it is characterized in that, the easily openable direction of above-mentioned lid is consistent in fact with the line part direction in above-mentioned linearity crack and above-mentioned U font crack, as if pinching the tab portion of above-mentioned formation separated material mouth usefulness and above-mentioned lid being torn from the said vesse body, then above-mentioned lid can be along above-mentioned linearity crack and the extended line separately of the line part in above-mentioned U font crack tear, thereby form a plurality of separated material mouths.

11, according to claim 9 or 10 described container for fast food, it is characterized in that, on the extended line separately of the line part in above-mentioned linearity crack and above-mentioned U font crack, be provided with the hemisection groove that forms separated material mouth usefulness.

According to any described container for fast food in the claim 9～11, it is characterized in that 12, the line part front end in the front end in above-mentioned linearity crack and above-mentioned U font crack is positioned at the outside, Central Line on the sealing of above-mentioned lid.

13, container for fast food according to claim 12, it is characterized in that, the front end in above-mentioned linearity crack and above-mentioned U font crack enters the position in the sealing of above-mentioned lid, from outside in 30～50% the scope of thoughtful above-mentioned sealing width.

According to any described container for fast food in the claim 9～13, it is characterized in that 14, above-mentioned Kaifeng is arranged on the tab portion of tab portion and above-mentioned formation separated material mouth usefulness on the position of opposite face of neighboring; Above-mentioned Kaifeng tab portion, has the jut that constitutes by neck and head, above-mentioned Kaifeng is upwards lifted with tab portion, make above-mentioned cap portion Kaifeng, by making above-mentioned jut be engaged on the through hole of the stripping portion that an above-mentioned U font crack or forms by the separated material interruption-forming Kaifeng that can keep above-mentioned lid.

15, container for fast food according to claim 14, it is characterized in that and above-mentioned U font crack in the structure of above-mentioned jut engaging have the protrusion of a Zhou Fangxiang.

16, according to any described container for fast food in the claim 9～15, it is characterized in that, on above-mentioned lid, be provided with and tear stop flag, pinching the tab portion of above-mentioned formation separated material mouth, above-mentioned lid is being torn to the above-mentioned stop flag of tearing from the said vesse body.

17, a kind of container for fast food, be after injecting hot water with the container for fast food of hot water evacuation, it is characterized in that:

Lid by vessel and end boss sealed in its upper portion constitutes; On the above-mentioned lid roughly on the position of opposite face, be provided with the tab portion of Kaifeng with tab portion and formation separated material mouth usefulness, above-mentioned Kaifeng tab portion, has the jut that constitutes by neck and head, the tab portion of above-mentioned formation separated material mouth usefulness, have the crack of pair of straight wire and in chien shih open end, the crack of above-mentioned pair of straight wire towards inboard and a plurality of essence that be provided with are the crack of U font; Each U font crack is made of with U font that is connected two line parts or circular-arc connecting portion a pair of line part; The front end in above-mentioned linearity crack and above-mentioned U font crack all is positioned at the sealing of above-mentioned lid; Above-mentioned Kaifeng upwards lifted with tab portion make above-mentioned lid form part Kaifeng, be engaged on an above-mentioned U font crack or the through hole Kaifeng that can keep above-mentioned lid by the stripping portion that forms of separated material mouth by making above-mentioned jut.

18, container for fast food according to claim 17, it is characterized in that and above-mentioned U font crack in the structure of above-mentioned jut engaging, have the protrusion of a Zhou Fangxiang.

19, according to claim 17 or 18 described container for fast food, it is characterized in that, the easily openable direction of above-mentioned lid, consistent in fact with the direction of the line part in above-mentioned linearity crack and above-mentioned U font crack, pinching the tab portion of above-mentioned formation separated material mouth usefulness, above-mentioned lid is torn from the said vesse body, then above-mentioned lid can be along above-mentioned linearity crack and the extended line separately of the line part in above-mentioned U font crack tear, thereby form a plurality of separated material mouths.

According to any described container for fast food in the claim 17～19, it is characterized in that 20, the front end in each U font crack is provided with the narrow more bevelled line portion of a pair of its spacing more forward.

According to any described container for fast food in the claim 17～20, it is characterized in that 21, the front end in pair of straight wire crack is provided with the wide more bevelled line portion of a pair of its spacing more forward.

22, according to any described container for fast food in the claim 1～21, it is characterized in that above-mentioned lid is made of the lamination thin slice, described lamination thin slice has resin film, paper sheet, stiffness films and a heat seal film at least from top; At least one of above-mentioned resin film, above-mentioned stiffness films and above-mentioned sealing film has tearing property of straight line.

23, container for fast food according to claim 22, it is characterized in that above-mentioned resin film has quiet retentivity, utilize the quiet retentivity of resin film, above-mentioned tab portion is upwards lifted, and then lid is torn and the wing flap portion that forms can keep the state that in fact upwards lifts.

24, according to claim 22 or 23 described container for fast food, it is characterized in that above-mentioned lid is formed by the lamination thin slice, this lamination thin slice, be bonding and constitute with above-mentioned paper sheet under the state of giving above-mentioned resin film tension force, make above-mentioned lid have crimpiness.

25, according to any described container for fast food in the claim 22～24, it is characterized in that above-mentioned resin film is made of polybutylene terephthalate.

According to any described container for fast food in the claim 22～24, it is characterized in that 26, above-mentioned stiffness films is made of the polybutylene terephthalate film of the different double orientation of one-way orientation or the degree of orientation.

27, a kind of instant food is characterized in that, is accommodated in the claim 1～26 in any described container for fast food.

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