JP2005281599A - Resealable tape and pouch container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resealable tape which does not lose its beautiful appearance by heat-sealing, can be released smoothly from the roll of a wound tape and does not harm the package of a pouch container, and also to provide the pouch container using the resealable tape. <P>SOLUTION: The pouch container comprises a main container in a package form and a resealable tape 20 which is heat-sealed to the opening section where the content of the main container can be taken out. The resealable tape 20 comprises an adhesive layer 21, which is constituted by a synthetic rubber-based adhesive agent of a hot-melt type and has an easy-to-peel property and resealable property, and a coating layer 22, which coats over whole circumference of the above adhesive layer and has a heat adhesive property formed by low density polyethylene. In the section of one sealing surface S2 of the coating layer 22 facing to the adhesive layer 21, one pair of longitudinally extended slit lines 23 and 23 in a specified distance apart with the depth of about 1/3 of the thickness of the coating layer 22 is formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resealable tape that is heat-sealed at a portion serving as an outlet of the pouch container in order to reseal the once opened pouch container, and a pouch container using the reseal tape.

  An example of a pouch container having a resealable outlet is shown in FIG. As shown in FIGS. 2A and 2B, the pouch container 50 has a peripheral portion of a pair of front and back exterior sheets 51 and 52 formed by a packaging material whose inner surface is made of a flexible sheet having thermal adhesiveness. It is formed in a bag shape by heat-sealing, and on both side edge portions of the exterior sheets 51 and 52 heat-sealed with each other, a pair of left and right cuts 53 on the lower side of the upper edge heat-sealed portion, 53 is formed. Therefore, the pouch container 50 is broken by using the notch 53 as a trigger, and the upper end of the pouch container 50 is cut off to form a content outlet. In addition, the shaded display part in the same figure (a) has shown the heat seal area | region of the exterior sheets 51 and 52. FIG.

  Further, in this pouch container 50, as shown in FIGS. 4A and 4B, a portion serving as a content outlet is formed on the inner surfaces of a pair of front and back exterior sheets 51, 52, a sealant layer 61, an intermediate A reseal tape 60 having a four-layer structure comprising a layer 62, an adhesive layer 63 having easy peeling and re-adhesiveness, and a sealant layer 64 is heat-sealed, and as shown in FIG. After the content outlet 50a is formed by cutting off the portion indicated by the alternate long and short dash line in the same figure, the exterior sheet 51 that is adhered to each other via the reseal tape 60 at the outlet 50a portion, When the 52 are separated from each other, the sealant layer 64 heat-sealed to the exterior sheet 52 is peeled off from the adhesive layer 63 as shown in FIG. Thereby making it possible to retrieve the contents.

  Further, when the contents remain in the pouch container 50 that has been once opened in this manner, as shown in FIG. The portion of the sealant layer 64 peeled off from the adhesive layer 63 in a state heat-sealed to the sheet 52 is stuck to the adhesive layer 63, and the outlet 50a can be kept closed again. .

JP 2003-137314 A

  By the way, since the reseal tape 60 as described above is simply formed by laminating the sealant layer 61, the intermediate layer 62, the adhesive layer 63, and the sealant layer 64, the adhesive layer 63 is exposed on the end face of the reseal tape 60. As shown in FIG. 12 (a), when the reseal tape 60 is sandwiched between the exterior sheets 51 and 52 in order to heat-seal the reseal tape 60 to the exterior sheets 51 and 52, As shown in b), when the adhesive layer 63 softened by heat is pressed, the adhesive layer 63 protrudes from the end face of the reseal tape 60, detracting from aesthetics, and the adhesive layer 63 is thinned to provide adhesive performance (reseal performance). There is a problem that decreases.

  In addition, such reseal tape 60 is normally stored in a state wound in a roll shape. However, as described above, in a state wound in a roll shape, the reseal tape 60 is exposed on the end face of the reseal tape 60. The adhesive layers 63 that are in contact with each other may come into contact with each other, and the reseal tape 60 may not be smoothly fed out.

  In addition, such reseal tape 60 is heat-sealed to the packaging material while being sent together with the long strip-shaped packaging material forming the exterior sheet 52 in the bag making process of the pouch container 50. If the adhesive layer 63 is exposed on the end face of the reseal tape 60, the reseal tape 60 itself will slip, and the pouch container may be made in a bag.

  Furthermore, in the case of the reseal tape 60 in which the sealant layer 61, the intermediate layer 62, the adhesive layer 63, and the sealant layer 64 are laminated with an adhesive, if the end face is exposed in the pouch container 50, the contents are There is also a problem that it comes into contact with the exposed adhesive at the end face portion, which is unfavorable for hygiene.

  Accordingly, an object of the present invention is to provide a resealable tape that does not impair the aesthetics even when heat-sealed, can be smoothly fed out from a rolled state, and does not interfere with pouch container bag making. And providing a pouch container using the reseal tape.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a reseal tape in which both the front and back surfaces are respectively heat-sealed to the portion serving as the outlet of the pouch container in order to reseal the once opened pouch container. And an adhesive layer having easy peeling and re-adhesiveness, and a coating layer that covers the adhesive layer so that the adhesive layer is not exposed and whose outer surface has thermal adhesiveness, The resealable tape is characterized in that both side edges in the width direction in the seal region of one of the seal surfaces or the outside of the seal region are formed so as to be easily breakable.

  The invention according to claim 2 is the resealable tape of the invention according to claim 1, wherein both edges of the sealing region in the width direction are sandwiched between the sealing layers on either sealing surface. Alternatively, a pair of easily breakable lines is formed outside the seal region.

  In order to solve the above-mentioned problems, the invention according to claim 3 is characterized in that the reseal tape of the invention according to claim 1 or 2 is heat-sealed at a portion serving as a content outlet. A pouch container is provided.

  As described above, the resealable tape according to the first and second aspects of the present invention prevents the adhesive layer from being exposed due to the presence of the coating layer covering the adhesive layer. The adhesive layer does not protrude when heat-sealing, and the aesthetic appearance of the pouch container of the invention according to claim 3 in which such a reseal tape is heat-sealed is not impaired. Further, even when the adhesive layer and the covering layer constituting such a reseal tape are laminated via an adhesive, the end surface is not exposed in the pouch container, so the contents are adhesive. It is preferable in terms of hygiene.

  In addition, since the adhesive layer is not exposed in such a reseal tape, the adhesive layer does not come into contact with each other even when wound in a roll shape, and can be smoothly fed out. Even when the pouch container is bag-made while heat-sealing, the reseal tape sent with the packaging material does not slip, and the pouch container can be made stably.

  Further, in the covering layer constituting the reseal tape of the invention according to claim 1, both side edges in the width direction in the seal region of any one seal surface or the outside of the seal region are formed so as to be easily ruptured. In the covering layer constituting the reseal tape of the invention according to claim 2, both side edges in the width direction of the seal region or the seal region of the seal region so as to sandwich the seal region of any one of the seal surfaces. Since a pair of easily breakable lines are formed on the outside, when the pouch container of the invention according to claim 3 in which such a reseal tape is heat-sealed, both side edges in the width direction and a pair of pairs in the seal region are opened. Along the easy-break line, the covering layer of these reseal tapes is easily broken, and a part of the covering layer is easily and reliably peeled off. It can be coercive.

  Hereinafter, embodiments will be described with reference to the drawings. As shown in FIGS. 1 to 3, the pouch container 1 includes a container body 10 formed in a bag shape, and a reseal tape 20 heat-sealed at a portion serving as a content outlet in the container body 10. As shown in FIG. 4, the container body 10 is composed of a base layer L1 having a thickness of 12 μm formed by a polyethylene terephthalate film, an intermediate layer L2 having a thickness of 25 μm formed by a polyamide film, and a polyethylene film. The formed sealant layer L3 having a thickness of 40 μm is formed by a packaging material P having a three-layer structure in which the sealant layers L3 are sequentially stacked.

  2 and 3, the container body 10 is formed of a packaging material P and is folded inward from the bottom of the pair of front and back exterior sheets 11, 12 and both exterior sheets 11, 12, and the bottom gusset portion. As shown in FIGS. 3A and 3B, the periphery of the inner surface of the folded gusset sheet 13 is heat sealed to the inner surface of the exterior sheet 11, and the exterior The upper edge and both side edges of the inner surface of the sheet 11 are heat-sealed to form a bag shape. Note that the shaded display portions in FIGS. 3A and 3B indicate the heat seal area.

  Further, a pair of cuts 10a and 10a are formed on both upper side edges of the container body 10 heat-sealed so as not to reach the heat-sealed portion of the upper edge. The pouch container 1 can be opened by breaking the upper end portion of 10.

  Further, the gusset sheet 13 whose inner surface is heat-sealed to the exterior sheets 11 and 12 is partially cut off at both side edges as shown in FIGS. Since the exterior sheets 11 and 12 are point-sealed at the portion 13a, the lower portions of both side edges of the exterior sheets 11 and 12 heat-sealed to the gusset sheet 13 are not opened.

  As shown in FIGS. 5 (a) and 5 (b), the reseal tape 20 includes a pressure-sensitive adhesive layer 21 having an easily peelable and re-adhesive property formed of a synthetic rubber-based hot-melt type pressure-sensitive adhesive, and the pressure-sensitive adhesive layer 21. Is formed of low-density polyethylene and has a thermal bonding property, and a portion corresponding to the adhesive layer 21 on one sealing surface S2 of the coating layer 22 has a width. A pair of cuts 23 and 23 having a depth of about 1/3 of the thickness of the coating layer 22 extending in the longitudinal direction with a predetermined interval in the direction are formed. The physical properties of the adhesive layer 21 constituting the reseal tape 20 are shown in Table 1, and the physical properties of the coating layer 22 are shown in Table 2.

  The size of the pressure-sensitive adhesive layer 21 constituting the reseal tape 20 is in the range of 6 to 12 mm in width and 30 to 100 μm in thickness, and the size of the coating layer 22 is 10 to 20 mm in width (width of the reseal tape 20). The thickness may be appropriately set within a range of 5 to 300 μm, and the material for forming the coating layer 22 may be polypropylene, ethylene vinyl acetate copolymer, ethylene copolymer, or the like in addition to low-density polyethylene.

  In this reseal tape 20, as shown in FIGS. 3A and 3B, the seal surface S1 on which the notches 23 and 23 are not formed is heat-sealed to the exterior sheet 11, and the notches 23 and 23 are formed. Is sealed to the exterior sheet 12, but the entire seal surfaces S1 and S2 are not heat sealed to the exterior sheets 11 and 12, as shown in FIG. As shown in the shaded area in a), the seal surface S1 on which the cuts 23 and 23 are not formed is an outer portion in the width direction (the cut 23) so as to exclude a portion corresponding to the adhesive layer 21. , 23) is only heat-sealed to the exterior sheet 11, and as shown in the shaded area in FIG. , A pair of notches Only between 3 and 23 are heat sealed to the outer sheet 12.

  The reseal tape 20 configured as described above is manufactured as follows. First, a linear body having a two-layer structure in which the pressure-sensitive adhesive layer 21 is coated with the tube-shaped coating layer 22 is obtained by co-extrusion of the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer 21 and the sealant resin that forms the coating layer 22. Extrusion molding is performed, and the linear body is sandwiched between a pair of compression rollers and compressed into a tape shape, and then cut on one side to form a pair of cuts 23 and 23. In addition, as a pressure-sensitive adhesive to be used, a solventless type pressure-sensitive adhesive (for example, a synthetic rubber-based hot-melt pressure-sensitive adhesive, an ethylene vinyl acetate copolymer-based hot-melt pressure-sensitive adhesive, or an olefin-based hot-melt pressure-sensitive adhesive) that can be extruded is used. It is necessary to adopt.

  The reseal tape 20 is handled in the form of a tape roll wound in a roll shape, and is heat sealed to the container body 10 in the bag making process of the pouch container 1. While the packaging material P is being fed out from the packaging material roll, the reseal tape 20 fed from the tape roll is fed onto the sealant layer L3 of the packaging material P, and the cut 23 of the reseal tape 20 is not formed. The seal surface S1 is heat-sealed to the sealant layer L3 of the packaging material P as shown in FIG. It is possible to attach the melted reseal tape 20 to the packaging material P by extruding and pressure bonding.

  Subsequently, as in the case of a normal pouch container, while filling the container body 10 or after bag making, after filling the contents, the upper edge portions of the exterior sheets 11 and 12 are heat-sealed to each other. Thus, when the container body 10 is sealed, the sealing surface S2 on which the notch 23 is formed in the reseal tape 20 in which the sealing surface S1 is heat sealed to the exterior sheet 11 side is shown in FIG. As shown, when heat sealing is performed on the sealant layer L3 of the packaging material P forming the exterior sheet 12, a pouch container 1 as shown in FIG.

  As shown in FIG. 7A, the pouch container 1 configured as described above is formed by breaking the unsealed portion between the upper edge seal portion and the reseal tape 20 from the notch 10a. Then, when the exterior sheets 11 and 12 are separated from each other at the outlet M portion, the covering layer 22 of the reseal tape 20 is cut into 23, as shown in FIG. Since the sealing portion between the cuts 23 and 23 in the covering layer 22 of the reseal tape 20 that is easily broken along the outer sheet 23 and heat-sealed to the exterior sheet 12 is peeled off from the adhesive layer 21 in a band shape, FIG. As shown in (b), the outlet M is opened, the pouch container 1 is opened, and the contents can be taken out.

  Thus, even when the pouch container 1 is once opened, when the outlet M is closed, the strip-shaped coating layer 22 peeled off from the reseal tape 20 in a state of being heat-sealed to the exterior sheet 12 side. Since the portion is attached again to the exposed portion of the adhesive layer 21 in the reseal tape 20 heat-sealed to the exterior sheet 11 and the outlet M is held in a closed state, it can be easily resealed.

  As described above, the reseal tape 20 used in the pouch container 1 is handled in the state of a tape roll wound in a roll shape, but the adhesive layer 21 is completely covered by the covering layer 22, Even when wound in a roll shape, the adhesive layers 21 do not come into contact with each other, and the reseal tape 20 can be smoothly and reliably fed out from the tape roll. As described above, the reseal tape 20 is applied to the packaging material P. Even when the container body 10 is bag-formed while heat-sealing, the reseal tape 20 delivered together with the packaging material P does not slip, and the container body 10 can be stably bag-made. .

  Further, when the reseal tape 20 is heat-sealed to the packaging material P that forms the exterior sheets 11 and 12, the reseal tape 20 superimposed on the packaging material P is heated and pressed by a seal roller or the like. As described above, in the reseal tape 20, since the adhesive layer 21 is completely covered with the coating layer 22, the adhesive layer 21 softened by heat does not protrude outside, and the adhesive layer is exposed at the end face. Compared with the case where a conventional reseal tape is employed, it is possible to heat-seal cleanly, and the aesthetic appearance of the pouch container 1 is not impaired.

  In addition, since the covering layer 22 constituting the reseal tape 20 has a pair of cuts 23 and 23 formed on both side edges in the width direction in the seal region of one seal surface S2, the reseal tape When the pouch container 1 in which the heat seal 20 is heat-sealed is opened, the covering layer 22 of the reseal tape 20 is easily broken along the pair of cuts 23, 23, and the pair of cuts 23, 23 in the covering layer 22. Since the seal portion sandwiched between the layers can be easily and reliably peeled off, good opening performance can be ensured.

  In the above-described embodiment, the pair of cuts 23 and 23 are formed on both side edges in the width direction in the seal region of one seal surface S2 of the reseal tape 20, but the present invention is not limited to this. It is also possible to set the seal region inside the pair of cuts so that a slight gap is formed between both side edges of the seal region and the cuts.

  In the above-described embodiment, only the inside of the pair of cuts 23 and 23 is heat-sealed. However, the present invention is not limited to this, and the entire sealing surface on which the cuts are formed is heat-sealed. It is also possible. However, in that case, when opening the pouch container, the inner sealing strength of the pair of cuts is set so that the inner coating layer of the pair of cuts is stripped off. It must be larger than the strength.

  Further, in the above-described embodiment, the reseal tape 20 in which the adhesive layer 21 is coated with the coating layer 22 having a single layer structure formed of the sealant resin is employed, but the present invention is not limited to this, and the outermost layer is not limited thereto. If it has thermal adhesiveness, it is also possible to employ a reseal tape having a multi-layer coating layer.

  Further, in the above-described embodiment, the reseal tape 20 in which the adhesive layer 21 is coated with the tube-shaped coating layer 22 by coextruding the adhesive and the sealant resin is employed, but the present invention is not limited to this. As shown in FIG. 8, a reseal tape 20a in which the adhesive layer 21 is sandwiched between a pair of coating layers 22a and 22b and both side edges in the width direction of the pair of coating layers 22a and 22b are mutually heat-sealed. It is also possible to adopt. In this case, as the coating layers 22a and 22b, for example, a single layer film made of a polyolefin resin such as low density polyethylene or linear low density polyethylene, or a polyolefin film such as low density polyethylene or linear low density polyethylene A multilayer film in which an inner layer having a lower melting point than that of an outer layer made of a polyolefin-based, polyester-based, or polyamide-based resin having a heat sealing property is laminated on the outer layer made of a resin can be used.

  Further, in the above-described embodiment, the reseal tape 20 in which the pair of cuts 23 and 23 are formed on one seal surface S2 is adopted as the easily breakable line, but the present invention is not limited to this. As shown in FIG. 9 (a), notches 23a and 23a are formed instead of the notches 23 and 23, or when the covering layer 22 is extruded as shown in FIG. It is also possible to form the thin portions 23b and 23b at positions corresponding to.

  When the covering layer 22 is formed of a resin having a low breaking strength (for example, a resin obtained by blending polyolefin with styrene, fine particles, or the like), for example, substantially the entire sealing surface S1 is heat-sealed, and the sealing surface S2 is used. If the center portion in the width direction is heat-sealed with a predetermined width, the covering layer 22 is easily broken at both side edges of the narrow seal region in the seal surface S2 when the outlet is formed in the pouch container. Further, it is not always necessary to form an easily breakable line composed of the notches 23, 23, etc., and a coating layer formed of a resin or the like on which the seal surface S1 side and the seal surface S2 side are different may be employed.

  In addition, the embodiment described above is a bottom gusset type self-supporting pouch container, but is not limited to this, and is also applicable to a flat bag type pouch container that does not have a bottom gusset portion and does not have a self-supporting property. Needless to say, the present invention can also be applied to the case where the palm-wrapped portion of the pillow package is formed so as to be resealable.

(A) is a perspective view which shows one Embodiment of the pouch container concerning this invention, (b) is a perspective view which shows the state which opened the pouch container same as the above. It is a top view which shows the state which folded the pouch container same as the above into flat. (A) is a top view which shows the state which removed the one exterior sheet in the same pouch container, (b) is a top view which shows the state which removed the other exterior sheet in the same pouch container. It is sectional drawing which shows the packaging material which forms the exterior sheet and gusset sheet | seat of a pouch container same as the above. (A) is a perspective view which shows the reseal tape used for the pouch container same as the above, (b) is sectional drawing which shows the reseal tape same as the above. (A), (b) is explanatory drawing for demonstrating the sealing area | region in the sealing surface of a reseal tape same as the above. (A) is sectional drawing which shows the state which formed the outlet in the pouch container same as the above, (b) is sectional drawing which shows the state which opened the pouch container same as the above. It is sectional drawing which shows the reseal tape which is other embodiment. (A), (b) is sectional drawing which shows the reseal tape which is other embodiment. (A) is a top view which shows the state which folded the conventional pouch container flat, (b) is a fragmentary sectional view which shows a pouch container same as the above. (A)-(c) is explanatory drawing for demonstrating opening operation of a pouch container same as the above. (A), (b) is explanatory drawing for demonstrating the problem of the reseal tape currently used for the pouch container same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pouch container 10 Container main body 10a Incision 11, 12 Exterior sheet 13 Gusset sheet 13a Cut part 20, 20a Reseal tape 21 Adhesive layer 22 Covering layer 23 Notch M Outlet P Packaging material L1 Base material layer L2 Intermediate layer L3 Sealant layer S1, S2 Seal surface

Claims (3)

In order to reseal the pouch container once opened, both sides of the front and back are resealable tapes that are heat-sealed to the part that becomes the outlet of the pouch container,
A pressure-sensitive adhesive layer having easy peeling and re-adhesion;
A coating layer that covers the pressure-sensitive adhesive layer so that the pressure-sensitive adhesive layer is not exposed, and has an outer surface having thermal adhesiveness;
The resealable tape, wherein the covering layer is formed such that both side edges in the width direction in the seal region of one of the seal surfaces or the outside of the seal region can be easily broken.   2. A pair of easily breakable lines is formed in the covering layer on both side edges in the width direction in the seal region or outside the seal region so as to sandwich the seal region on any one of the seal surfaces. Resealable tape as described in 1.   The pouch container, wherein the resealable tape according to claim 1 or 2 is heat-sealed at a portion serving as a content outlet.

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