CN107814087A - gas seal - Google Patents

Abstract

The invention relates to a wrapping material with shock absorption performance, in particular to an improved gas sealing body which comprises two outer membranes and two inner membranes, wherein strip-shaped heat-resistant blocks are arranged on the surface of one inner membrane facing to the other inner membrane at intervals. At least one of the two inner films is a film containing a nylon layer. Has the advantage of preventing air leakage of the air chamber.

Description

gas seal

technical field

This invention relates to wrapping materials having shock-absorbing properties, and in particular to gas-tight bodies made of plastic film.

Background technique

The gas sealing body referred to in the present invention refers to a gas sealing body composed of a plurality of air chamber cavities formed by bonding or heat welding of plastic films from a structural principle, and the gas sealing body formed after the plurality of air chamber cavities are inflated.

Patent document CN1754784A discloses a fluid container, that is, the gas sealing body of the present invention. In order to form an air retention after inflating from the inflation channel to each air chamber, a stop valve is provided at the air inlet from the inflation channel to the air chamber. According to different production processes, there are different schemes for forming the air inlet. Among them, it seems that the more advanced one is to set the printing mark formed by heat-resistant paint, which is also called heat-resistant block at present. The function of heat-resistant block is to press In the process of forming the sealing body, it is convenient to form an air inlet to improve production efficiency.

In practice, it is found that the scheme disclosed in CN1754784A has the following shortcomings, that is, the opening of the air inlets during the inflation process of each air chamber is not as smooth as designed.

In order to solve the problem of unsmooth opening, patent document CN100467358C announces an air buffer body with a sealing body air-tight air-lock device and a manufacturing method thereof. It designs the heat-resistant block so that half of it is in the inflatable channel and the other half is in the air chamber, and a heat-seal point is set in the inflatable channel. The heat-sealed point makes the inner film only connect with one piece of outer film, so that when the inflatable channel expands, it can Quickly pull the air intake open.

However, since the air chamber is long and narrow, the strip-shaped heat-resistant blocks are narrower. In the actual production process, since the hot pressing is completed in multiple processes, corresponding heat-seals should be applied to the multiple heat-resistant blocks arranged horizontally. point, it is very easy to cause the heat sealing point to deviate from the heat sealing block in the lateral direction due to factors such as tolerances. In other words, if you want to meet the design requirements, you have extremely high requirements for the accuracy of equipment and molds.

In addition, the structural principles of the above-mentioned existing air seals can be seen in Figure 1 and Figure 2. The thin solid lines in the two figures represent the contour lines of parts, the thick solid lines represent heat-sealing lines, and the dotted lines represent the heat-sealing lines. After heat sealing, the two inner films were not bonded, but the outer film was bonded to the adjacent inner film. The main body of this air-tight body is made of outer membrane 1, outer membrane 4, inner membrane 2 and inner membrane 3 that are arranged between outer membrane 1 and outer membrane 4, when according to Fig. Together, and through the upper heat-sealing line 5, the middle heat-sealing line 6, the lower heat-sealing line 7, and the longitudinal heat-sealing line 8 are welded to form an inflatable channel, and the inflatable channel is connected to each other through a plurality of air inlets 101. air chamber. One piece of inner membrane 2 facing the upper surface of inner membrane 3 is provided with a strip-shaped heat-resistant block 10 at intervals. The heat-resistant block is a strip-shaped area on the inner membrane surface, and the strip-shaped area is coated with heat-resistant material. The heat-sealing line 6 in the middle part spans each strip-shaped heat-resistant block and the longitudinal heat-sealing line, bonding the four films at the place where the outer film 1, the inner film 2, the inner film 3 and the outer film 4 are not provided with a heat-resistant block, separating Exit the inflatable channel and air chamber. The air-filled channel is formed between the front outer membrane and the rear outer membrane between the middle heat-sealing line 6 and the upper heat-sealing line 5 . Air inlets 101 are formed at the strip-shaped heat-resistant block 10 between two adjacent longitudinal heat-sealing lines 8 between the inner membrane 2 and the inner membrane 3 , and each inlet 101 communicates the inflation channel with an air chamber.

Referring to Fig. 3, Fig. 3 shows a cross-sectional view of the air-inflating channel 11 before degassing after the air-tight body is inflated, which is used to illustrate the positional relationship and force between the inflating channel 11, an air inlet 101 and its corresponding air chamber 12 state. Inflatable channel 11 is located between the upper heat-sealed line 5 and the middle heat-sealed line 6, the air chamber 12 is located between the middle heat-sealed line 6 and the lower heat-sealed line 7, and the air inlet 101 communicates with the inflated channel 11 and the air Room 12. During actual use, it is found that although the area of the air inlet 101 is small, it is closed by a piece of inner membrane 3 after the inflation is completed, and the pressure in the air chamber 12 as indicated by the arrow is usually much greater than the external pressure. 11 equalizes the pressure with the outside world after degassing, and the inner membrane 3 in the air inlet area is pressed out to the inflatable channel 11. Since the main function of the existing inner membranes 2 and 3 is to hold air, the two inner membranes 2 and 3 are required to meet the air-holding performance requirements. The film has good adhesion, but the tensile performance is neglected. Under the action of pressure, the inner film in the region of the air inlet 101 is stretched in the plane of the film by a large internal stress, forming the upper film shown in FIG. 3 . Convex curved surface, the area of the convex curved surface is larger than the area of the air inlet 101. Under the same air permeability, the larger the area, the faster the air leakage of the air chamber 12. This problem was found through the following experiment. Inflate the gas in the inflatable channel 11 and close the inflatable port. At this time, the two outer membranes forming the area of the inflatable channel 11 are in a state of close contact with each other. After placing it for a few days, it is found that the inflatable channel is bulging, because the external gas cannot pass through the outer membrane. Therefore, the gas in each air chamber 12 can only enter the inflation channel 11 through the inner membrane of the air inlet 101 area.

The existing gas sealing body has the defects that the above-mentioned top 901 is easily torn when it is inflated, and the gas leakage is accelerated at the air inlet after inflation due to the stretching of the inner film.

Therefore, the main technical problem faced by the present invention is to solve how to further improve the air-tight effect of the air chamber or the air chamber; another technical problem faced is to solve the gas-stop valve structure that reduces the process precision requirements under the premise that the gas-stop valve is convenient to open. .

Contents of the invention

The main purpose of the present invention is to provide a gas sealing body that improves the air-tight effect of the gas chamber;

Another object of the present invention is to provide a gas sealing body that can open the gas stop valve smoothly even when the tolerance is relatively large.

To achieve the above main purpose, the gas sealing body provided by the present invention includes two outer films and two inner films, wherein the surface of one inner film facing the other inner film is provided with strip-shaped heat-resistant blocks at intervals. At least one of the two inner films is a film containing a nylon layer.

It can be seen from the above scheme that when the inner membrane adopts a membrane containing a nylon layer, a piece of inner membrane as a valve membrane will block the air inlet of the air chamber. Although the pressure of the air chamber is much higher than the outside world, the inner membrane in the air chamber Under the action of pressure, because the inner membrane contains a nylon layer with extremely high tensile strength and a very small elongation rate, it will not be stretched to protrude outward in the direction of the inflatable channel, which makes the gas sealing body maintain a long-term sealing effect .

A further scheme is that the inner film that seals the air inlet of the air chamber after inflation adopts a film containing a nylon layer.

A further solution is that the top of the middle heat-sealing line is lower than or flush with the top of the heat-resistant block, and the top of the middle heat-sealing line is located within the area of the heat-resistant block.

In order to achieve another purpose of the present invention, a further solution is that when the top of the middle heat-sealing line is lower than the top of the heat-resistant block, a section of the middle heat-sealing line located in the air chamber area includes a protrusion protruding toward the direction of the inflatable channel. start paragraph. The setting of the raised section enables the inflatable channel to be opened while the inner membrane located in the inflatable channel is also opened, and then the air inlet is opened, so that the air stop valve can be opened smoothly and the processing accuracy requirements are also reduced. Thereby improving the qualification rate of the product.

A further solution is that the distance H between the top of the middle heat-sealing line and the top of the heat-resistant block is 0.5 mm to 5 mm; the raised distance h of the raised section is 0.5 mm to 2 mm.

To achieve the above-mentioned main purpose, another gas-tight body provided by the present invention includes two outer films and one inner film, and strip-shaped heat-resistant blocks are arranged at intervals on one surface of the inner film. The inner membrane adopts a membrane including a nylon layer.

A further solution is that the top of the heat-sealing line in the middle is lower than or flush with the top of the heat-resistant block, and the top of the heat-sealing line in the middle is located within the area of the heat-resistant block.

A further solution is that when the top of the middle heat-sealing line is lower than the top of the heat-resistant block, a section of the middle heat-sealing line located in the air chamber area includes a raised section protruding toward the direction of the inflation channel.

A still further solution is that the distance H between the top of the middle heat-sealing line and the top of the heat-resistant block is 0.5 mm to 5 mm; the convex distance h of the raised section is 0.5 mm to 2 mm.

Description of drawings

Fig. 1 is the structural exploded view of existing gas sealing body;

Fig. 2 is a partial enlarged view of A in Fig. 1;

Fig. 3 is a sectional view of an existing gas sealing body;

Fig. 4 is the front view of the first embodiment of the present invention;

Fig. 5 is a partial enlarged view of A in Fig. 4, which reflects the construction principle of the convex section of the heat-sealing line in the middle, and reflects the state when the distance H is greater than the distance h;

Fig. 6 is a partial enlarged view similar to Fig. 4, but reflects the state when the distance H is less than the distance h;

Figure 7 is also a partial enlarged view similar to Figure 4, but it reflects the state when the heat-sealing line in the middle is offset to the right relative to the strip-shaped heat-resistant block when the heat-sealing line in the middle is hot-pressed;

Fig. 8 is the structural form of the middle heat-sealing line in the second embodiment of the present invention;

Fig. 9 is a schematic diagram of the structural shape of the convex section of the middle heat-sealing line in the third embodiment of the present invention;

Fig. 10 is a schematic diagram of the structural shape of the convex section of the middle heat-sealing line in the fourth embodiment of the present invention;

Figure 11 is an optional shape of the heat-resistant block in other embodiments of the present invention;

Fig. 12 is another optional shape of the heat-resistant block in other embodiments of the present invention;

Fig. 13 is another optional shape of the heat-resistant block in other embodiments of the present invention;

Fig. 14 is another optional shape of the heat-resistant block in other embodiments of the present invention.

The present invention will be further described below in conjunction with various embodiments and accompanying drawings.

Detailed ways

first embodiment

The main improvement of the present invention is on the one hand the shape of the central heat-sealing line and its positional relationship with the strip-shaped heat-resistant block, and on the other hand the inner film material. The differences between the present invention and the prior art will be described in detail below, and those skilled in the art can fully implement the embodiments of the present invention according to the contents introduced in the prior art.

Referring to Fig. 4, the inflatable channel 11 is surrounded by the upper heat-sealing line 5, the middle heat-sealing line 6 and the leftmost longitudinal edge sealing line in Fig. 4, and the adjacent two longitudinal heat-sealing lines 8 and the lower heat-sealing line 7 and the middle heat-sealing line 6 enclose an air chamber 12, the air inlet 101 of the air chamber 12 is located on the strip-shaped heat-resistant block 10, and the middle heat-sealing line is located in a section of the air chamber area, and there is an upward, that is, an inflatable channel The protruding section 61 that stretches out in 11 directions.

Referring to Fig. 5, the top of the heat-sealing line 6 in the middle is lower than the top of the heat-resistant block 10, the distance H between the two can be selected from 0.5mm to 5mm, and the raised section 61 has a raised distance h that is optional The value range is from 0.5 mm to 2 mm. This example gives the state of H>h. When inflated, the two outer membranes 1 and 4 of the inflation channel 11 will be pulled apart in the front-back direction shown in Figure 5, that is, the left-right direction shown in Figure 3, because The entire protruding section 61 is located in the heat-resistant block 10, and the protruding section does not bond the two inner films 2, 3, but only adheres to the adjacent outer film. Therefore, the outer film will be pulled apart in the front-back direction. , and then open the air inlet 101. It can be understood that when H=h, the above opening works on the same principle.

In this example, the two inner membranes 2 and 3 are all made of plastic film with a nylon layer. The structure of each inner membrane is two layers of polyethylene with a layer of nylon sandwiched between the three layers. A piece of membrane is used as the inner membrane of this example, because there is a nylon layer in the middle, when the inner membrane is stretched by force, it can resist deformation. The polyethylene layer inside the outer layer can improve the heat bonding performance of the nylon layer, so that the inner membranes and outer membranes can be bonded.

In the following, the advantages of the present invention with a high rate of full grid will be described in conjunction with this example. When the inner and outer membranes are not stacked neatly due to various reasons, or the movement of the mold and the conveying line is relatively lagging, how to ensure that the deviation can still be achieved? Each air chamber can be inflated to avoid waste products that cannot be inflated due to individual air chambers. The main concept of the present invention to improve the qualified rate of the gas sealing body product is: even if there is a deviation, the inner film above the heat-sealing line 6 in the middle part can be pulled apart together with the outer film, and then the air inlet 101 is opened.

Referring to Figure 6, due to fluctuations in production line transportation, etc., when the inner film moves downward relative to the outer film, and the heat seal in the middle of the mold remains unchanged, that is, when H<h shown in Figure 6, the protrusion The section 61 will be divided into an open area 611 located in the area of the heat-resistant block 10 and a non-open area 612 located outside the area of the heat-resistant block 10. The feature that the open area 611 can be pulled apart with the outer film is the same as that described above, rather than an open area. 612 has been beyond the top of the inner membrane, so the two outer membranes are bonded together, which hinders the opening of the air inlet 101, but the pressure of the inflation channel 11 can still pull the opening area 611, that is, open The two inner membranes of the zone 611 are pulled apart as the inflatable channel 11 is pulled apart, and the gas in the inflatable channel 11 enters the air chamber 12 from both sides of the non-opened zone 612 according to the path shown by the hollow arrow in FIG. 6 .

Referring to Fig. 7, due to fluctuations in production line transportation, etc., when the mold with the middle heat-sealing line deviates to the left or right of the heat-resistant block 10, the right-moving distance shown in Fig. 7 exceeds half the width of the heat-resistant block 10 Above, the protruding section 61 will also be divided into an open area 611 located in the area of the heat-resistant block 10 and a non-open area 612 located outside the area of the heat-resistant block 10. The feature that the open area 611 can be pulled apart with the outer film is the same as the aforementioned Similarly, the non-opening area 612 bonds the four films together, and it also hinders the opening of the air inlet 101. However, the pressure of the air-filled passage 11 can still pull the opening area 611, that is, the two sheets of the opening area 611. The inner membrane is still pulled apart as the inflatable channel 11 is pulled apart, and the gas in the inflatable channel 11 enters the air chamber 12 from both sides of the non-opening area 612 according to the path shown by the hollow arrow in FIG. 7 .

second embodiment

Only the difference between this example and the first embodiment will be described below.

The top of the heat-sealing line 6 in the middle of this example is flush with the top of the heat-resistant block 10 . The main advantage of this example is to improve the gas-holding effect of the air chamber, that is, a piece of inner film containing a nylon layer is adopted, and the air inlet of the air chamber is closed when the inner film is air-holding. In the case that the precision of the process and equipment for producing the gas sealing body is very high, this example has the advantages of straight gas-filled passages and relative saving of raw materials.

third embodiment

The difference between this example and the first embodiment is the shape of the raised section 61, which is a quadratic arc in this example.

Fourth embodiment

The difference between this example and the first embodiment is also the shape of the protruding section 61 , which is a symmetrical broken line section in this example.

fifth embodiment

The difference between this example and the above-mentioned examples is as follows. The feature of this example is that there is only one piece of inner membrane, and the strip-shaped heat-resistant block 10 on the inner membrane is arranged on the surface facing the outer membrane 1, and the gap between the inner membrane and the outer membrane 1 There are heat sealing lines or points between them, but not between the outer membrane 4, so the inner membrane will be pulled towards the outer membrane 1 as shown in FIG. 3 . As the inner film, a film containing a nylon layer is used.

In addition to the trapezoid in the first embodiment, the optional shape of the strip-shaped heat-resistant block in the present invention can also be the oblong or waist circle shown in Figure 11, or the rectangle shown in Figure 12, or the rectangle shown in Figure 13 Slender waist shape, or the drum shape shown in Figure 14, as long as the two sides in the length direction of the air chamber do not have a line segment perpendicular to this direction, such as a T-shaped heat-resistant block.

The specific form of the gas sealing body of the present invention can be a flat pad as disclosed in CN1903678, or a U-shaped bag as disclosed in CN1903677A, or a C-shaped bag as disclosed in CN1903675A, or a J-shaped bag as disclosed in CN1903676A, or other suitable for being used. The special form of the appearance characteristics of the packaged goods, such as the shockproof sleeve disclosed in CN102107750A, these forms are all gas-tight bodies referred to in the present invention.

Claims (9)

1. air seal body, including two panels outer membrane and two inner membrances, wherein a piece of lining endothelium is to another inner membrance Surface is interval with heat-resisting piece of strip；

It is characterized in that：

It is at least a piece of using the film containing nylon layer in the two panels inner membrance.

2. air seal body according to claim 1, it is characterised in that：

The inner membrance of inflation rear enclosed air inlet of air chamber uses the film containing nylon layer.

3. air seal body according to claim 1 or claim 2, it is characterised in that：

The top of middle part hot-sealing line is less than or flushed described heat-resisting piece of top, and the top of the middle part hot-sealing line is positioned at described Within heat-resisting piece of region.

4. air seal body according to claim 3, it is characterised in that：

When the top of the middle part hot-sealing line is less than described heat-resisting piece of top, the middle part hot-sealing line is located at the one of air chamber area Section includes a raised section stretched out to filling channel direction.

5. air seal body according to claim 4, it is characterised in that：

The top of the middle part hot-sealing line to the distance between described heat-resisting piece of top H be 0.5 millimeter to 5 millimeters；

The protrusion distance h of the raised section is 0.5 millimeter to 2 millimeters.

6. air seal body, including two panels outer membrane and the stacked composition of a piece of inner membrance, a surface of the inner membrance is interval with bar Heat-resisting piece of shape；

It is characterized in that：

The inner membrance uses the film containing nylon layer.

7. air seal body according to claim 7, it is characterised in that：

The top of middle part hot-sealing line is less than or is flush to described heat-resisting piece of top, and the top of the middle part hot-sealing line is located at institute State within heat-resisting piece of region.

8. air seal body according to claim 7, it is characterised in that：

When the top of the middle part hot-sealing line is less than described heat-resisting piece of top, the middle part hot-sealing line is located at the one of air chamber area Section includes one to the raised section stretched out to filling channel direction.

9. air seal body according to claim 8, it is characterised in that：

The top of the middle part hot-sealing line to the distance between described heat-resisting piece of top H be 0.5 millimeter to 5 millimeters；

The protrusion distance h of the raised section is 0.5 millimeter to 2 millimeters.