JPS59209541A - Bag and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bag for a sealed package that can be resealed after opening, and a method for manufacturing the same.

Gas-barrier sheets (for example, various plastic films) are used to store snack foods, sweets, seaweed, etc. that do not want to absorb moisture, raw foods that prevent moisture evaporation, and poultices that want to prevent volatile active ingredients from escaping. , cellophane, Alξ
Hermetically sealed packaging using bags made of foil or laminated sheets using these materials is already widely practiced. In this type of sealed package, as long as the material for the bag is appropriately selected and the bag is completely sealed, the contents can be prevented from deteriorating over a long period of time, similar to when cans or bottles are used. In the case of shigashina sails, resealing once opened is not as easy as in the case of cans or bottles with lids, so even if there are unused contents, it is important to maintain their quality. In many cases, they were unable to do so and had to be discarded. Jitsugan Showa 57-1
The invention of No. 8436 succeeded in solving the drawbacks of these conventional sealed packaging bodies, and based on its structure, the bag can be easily resealed as needed even after the bag has been opened. It has the characteristic that it can be obtained by doing something. This is the first
This will be explained with reference to FIGS.

FIG. 1 is a partially cutaway view showing an embodiment of the above invention, and FIG. 2 is a longitudinal sectional view of the example shown in FIG. Bag 1 in this example is made by heat-sealing the four circumferences of two gas-barrier films, and contains contents 2 (for example, a poultice).
is included.

When opening IJ, the instruction is to cut the bag at the henihe line. 3 is a pressure-sensitive adhesive tape based on a film that can be adhered to the inner wall of the bag, and is heat-sealed to the inner wall 11 of the bag 1 on the back side (the surface opposite to the surface on which the pressure-sensitive adhesive is applied). (Therefore, pressure sensitive adhesive tape 3
The adhesive layer adheres to the inner wall 12 of the opposing bag. )
. FIG. 3 is a plan view showing the package shown in FIG. 1 cut along line A-A and opened, and FIG. 4 is a longitudinal sectional view showing the same state. Contents 2 are at the second end 13 of bag 1.
・] 4 by hand to release the bond between the inner surfaces of the bag by the pressure-sensitive adhesive tape 3 and take it out (the state shown in FIG. 5). news·
If you have leftover contents and would like to save them,
When the opening of the bag 1 where the pressure-sensitive adhesive tape 3 is pressed is pressed with a finger, the bag 1 returns to the state shown in FIG. 4 and the airtight state is maintained.

-1- Bags for sealed packages as described above can be manufactured by various methods, or by continuously supplying bag-making film and heat-sealing for bag-making, and then individually A possible manufacturing method that does not make any major changes to the conventional method of cutting bags, and does not reduce efficiency, is to use pressure-sensitive adhesive between the films when stacking the film for bag making and feeding it to the bag making machine. This method involves continuously supplying tape and heat-sealing it to a predetermined location. However, as shown in FIG. 6, the bag made by this method is embedded in both end portions 3a of the pressure-sensitive adhesive tape or in the side seal portion of the bag.
Moreover, its end is exposed at the edge of the side seal part.

Unfortunately, if this bag is used to package something containing volatile organic substances, such as a poultice, the pressure-sensitive adhesive or the volatile substance may swell during long-term storage, or the parts 3a at both ends of the pressure-sensitive adhesive tape may swell. If it reaches the pressure-sensitive adhesive, it becomes a tunnel-like ventilation path, severely reducing the airtightness of the bag. Another manufacturing method is to attach pressure-sensitive adhesive tape at one predetermined position after completing an ordinary bag, but this method is either inefficient or inefficient, and the resulting bag is attached to both ends of the pressure-sensitive adhesive tape. It is easy to leave a micro gap where adhesion is not possible at the tip of the
The drawback is that it is not airtight when resealed.

On the other hand, the bag according to the present invention is a three-sided seal bag or a three-sided seal bag for a resealable sealed package in the same manner as above, and the opening of one of the inner walls of the opposing bag is sealed. A pressure-sensitive adhesive tape is bonded to a location closer to the storage section with its back surface as a bonding surface, and the end of the pressure-sensitive adhesive tape is buried in the side seal portion of the bag. Therefore, there is no risk of deterioration in airtightness or poor resealability due to (i to 1%l) as described above.

The present invention also provides a method for easily manufacturing the bag according to the invention by a conventional method with the same efficiency as when manufacturing a normal three-side seal bag or a three-side seal bag, that is, a method for manufacturing the bag according to the invention using a heat-sealable film continuously. When producing a three-sided sealed bag or a three-sided sealed bag, a pressure-sensitive adhesive is applied in the center in a continuous stripe, and the pressure-sensitive adhesive coated layer is punched out over the entire width of the heat-sealable tape. A bag-making film that is supplied by overlapping perforated part-coated pressure-sensitive adhesive tapes, each of which has a group of punched holes of the same size in the length direction at full intervals equal to the width of the bag to be manufactured. During this time, the pressure-sensitive adhesive tape described in -1- is fed to the bag-making machine along with the bag-making film, interposed at a position inside the part that will become the opening seal part after the bag is completed, and the pressure-sensitive adhesive tape described in -1- is placed on the back side of the bag.
The present invention provides a manufacturing method characterized by heat-sealing the bag-making film opposite to the bag-making film, and laterally sealing the bag-making film at the position of the punched hole of the pressure-sensitive adhesive tape.

Next, the manufacturing method of the present invention will be explained with reference to the drawings.

FIG. 7 is a first explanation of an example in which the present invention is implemented in a self-supporting bag, which is a type of three-side seal bag, and employs the structure of the above-mentioned invention. Two plastic films for bag making (1a and 1) are continuously supplied, and a tape-shaped plastic film 4c (for forming the bottom of the bag) is folded in two between them on the - side. are supplied, and overlap them with a mating roll 5. Then, a vertical sealer 6 heat-seals between films 4a and 41) and between films 4b and 4C, and then a horizontal sealer 7 heats seals between films 4a and 41). heat seal, and finally cut out the unnecessary part with knife 8 and then cut it with knife 9.
The steps of cutting into individual bags 10 are carried out in exactly the same manner as in the conventional method for manufacturing self-supporting bags.

On the other hand, a perforated part-foot pressure-sensitive adhesive tape 20 is supplied with the adhesive coated side facing down to the opening of the films 4a and 4b, slightly inside the position which will become the opening after the bag is completed. The perforated part-foot pressure-sensitive adhesive tape 20 is shown in FIG. 8 (plan view from the adhesive coated side) and FIG. 9 (FIG. 8A-
As shown in section A), a heat-sealable tape 21 coated with pressure-sensitive adhesive 22 in a continuous stripe in the center is cut into a size such that the pressure-sensitive adhesive coated layer is punched out over the entire width. The punched holes 23 (that is, the diameter d or the width W of the pressure-sensitive adhesive coating layer, or larger) are arranged in a row in the length direction at intervals equal to the width of the bag to be manufactured. It is what it is. Considering the workability of bag making by feeding this tape and the handling of the finished bag,
It is desirable that the width W1 of the pressure-sensitive adhesive coating layer and the diameter d of the punched hole maintain the above relationship and be within the range expressed by the following formula (however, W2 is the width of the heat-sealable tape 21
).

0.5W2<Vv',<0.9L 0.5W,<d<0.95'vV2 In the illustrated example, the punch 25 is Although the punched holes 23 are formed using the above-described method, it is also possible to use a perforated part-coated pressure-sensitive adhesive tape completed on another production line.

The perforated part film 1 and the pressure-sensitive adhesive tape 20 sandwiched between the bag-making films 4a and 4b are simultaneously heat-sealed at the bottom by the vertical sealer 6.
The second vertical sealer 26 heat-seals the film 4a over its entire length. However, in this case, when the bottom heat seal is later sealed in line with the part 27 that will eventually be cut and becomes the end of the bottom, the punched holes 23 of the perforated part coat 1 and pressure sensitive adhesive tape 20 will be cut out. Adjust the position of the film in the direction of travel so that it enters the horizontal seal section. Furthermore, heat sealing using the vertical sealer 26 must be performed in a manner that prevents heat sealing between the perforated part-coated pressure-sensitive adhesive tape 20 and the film 41]. (I get confused). There are no particular limitations on the method for performing such sealing. A method is adopted in which the device is positioned directly above the device and pressed. In this way,
Only the central part of the back surface of the perforated part-coated pressure-sensitive adhesive tape 2 is heated within the range of the pressure-sensitive adhesive application width, and the temperature of the film 4b rises enough to be heat-sealed due to the heat insulation effect of the adhesive layer. Therefore, only the heat sealing between the film 4a and the tape 2 is performed (the portion of the tape 2 outside the area where the pressure sensitive adhesive is applied is not heat sealed with the film 4a).

FIG. 10 shows the bag 10 of the present invention obtained in the above manner.
This is a plan view of the area around the mouth. As shown in the figure, the pressure-sensitive adhesive layer 22 is removed by the punched hole 23, so that its end 22e does not reach the end of the bag. Around that area, the films 4a and 41 and the heat-sealable tape 21 are fused to the body. I wanted to,
The above-mentioned troubles that occur when the pressure-sensitive adhesive layer reaches the edges of the bag are completely avoided.

Although the present invention has been explained below in the case of a free-standing bag which is a special example of the 1-1 three-sided bag, it goes without saying that the present invention can also be practiced in the case of a normal three-sided sealed bag or a three-sided sealed bag. .

The adhesive of the pressure-sensitive adhesive tape used in the present invention is 10 (1 to 1.000 g725
It is sufficient to have a weak adhesive force of about 1.0 mm. Too strong an adhesive force is not preferred because it makes it difficult to open the bag and make it difficult to take out the contents. There are no particular restrictions on the type of pressure-sensitive adhesive, but when packaging products that contain volatile ingredients, such as poultices, anti-inflammatory/analgesic poultices, methyl galicylate, menthol, and peppermint oil, Adhesion may deteriorate due to volatile components, so care must be taken. An example of an adhesive used in cases such as 2 and 2 is a polyacrylic ester adhesive] t: + 0 parts by weight mixed with about 1 part by weight of an incyanate or melamine crosslinking agent. There's something wrong with that.

According to the present invention, as is clear from the above description, there is provided a resealable bag that does not cause a decrease in airtightness even when used for tight IJ packaging of items containing volatile organic substances,
Furthermore, according to the manufacturing method of the present invention, -) bags can be manufactured reliably and easily; It is possible to easily adapt to changes in the structure and fit.

[Brief explanation of the drawing]

Figures 1 to 6: An explanatory diagram of the structure and method of use of the honeymoon packaging body devised in Utility Application No. 18436/1987. Figure 7: Detailed explanatory diagram of the present invention. Figure 8: Perforated part coat feeling. Plan view of pressure-adhesive tape 2 () Fig. 9: Fig. 8 sectional view taken along line A-A Fig. 10 Fig. 2 Partially cutaway view (partial view) of bag 10 according to the present invention 1: Bag 2: Contents 3 : Pressure-sensitive adhesive tape 4: Bag-making film 6.26
: Vertical sealer 7 : Horizontal seal bar 10 : Bag according to the invention 20 : Perforated part-coated pressure-sensitive adhesive tape 21 : Heat-sealable tape 22 : Pressure-sensitive adhesive 23 : Punching hole agent Patent attorney San Itai

Claims (2)

[Claims] (1) In a three-sided sealed bag or three-sided sealed bag for a sealed package, a pressure-sensitive adhesive tape is placed on one of the inner walls of the opposing bag at a location closer to the storage area than the planned opening sealing position, with the back surface as the joint surface. A bag characterized in that the pressure-sensitive adhesive tape is joined and the end of the pressure-sensitive adhesive tape is embedded in a side seal portion of the bag. (2) When producing a three-sided seal bag or three-sided seal bag by continuously supplying a heat-sealable and gas-barrier film, a heat-sealable tape coated with a pressure-sensitive adhesive in a continuous strip in the center is used. A perforated part-coated pressure-sensitive adhesive tape having a group of punched holes in the length direction at intervals equal to the width of the bag to be manufactured, the size of which allows the pressure-sensitive adhesive coating layer to be punched out over the entire width. is interposed between the bag-making films that are superimposed and supplied, at a position inside the area that will become the mouth seal after the bag is completed, and is fed to the bag-making machine together with the bag-making film, and the above-mentioned Manufacture of a bag characterized by heat-sealing a pressure-adhesive tape with an opposing bag-making film on the back side thereof, and laterally sealing the bag-making film at the position of the punched hole of the pressure-sensitive adhesive tape. Law.