JP2002337892A - Bag having plastic fastener and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag having a fastener for which the fastener and a sealant part of the bag can be stably adhered without producing poor adhesion, blocking or deformation, even in the case that a cooling receptacle bar can not be used and also in the case that a temperature of a heat seal bar and a heat seal time are not strictly managed. SOLUTION: There is provided a bag member in which a molten resin layer showing a melting point that satisfies equations (1): Tft ( deg.C)-Tfs ( deg.C)=+10 to +80( deg.C) and (2): Ts ( deg.C)-Tfs ( deg.C)=-10 to -60( deg.C) is arranged at a connecting surface between a plastic fastener and a bag forming film C. (In the above equations, Tft denotes a melting point of a plastic fastener main body, Tfs denotes a melting point of a molten resin layer and Ts denotes a melting point of a sealant layer of the bag forming film, respectively).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag with a plastic fastener used as a packaging material for foods, medicines, electronic parts and the like, a method for producing the same, and a package using the bag.

[0002]

2. Description of the Related Art A conventional method for manufacturing a bag with a tape-shaped plastic fastener (hereinafter, "plastic fastener" may be simply referred to as "fastener") is shown in FIG. A heat seal bar A is used to form the flange portion of the formed film C and the tape-shaped fastener D.
The bag-forming film C and the fastener D are fused by heating and press-contacting between the heat sink and the cooling receiving bar B. Then, as shown in FIG. 12, both ends and the bottom surface of the fastener and the film are heat-sealed. The bag is formed by cutting the center (GG) of F. Therefore, in selecting the material of the fastener, the adhesion between the inner surface of the film C and the surface of the fastener D has been regarded as important. For this reason, with regard to a tape-shaped fastener to be attached to an opening of a bag formed of a plastic film, the material structure or the fastener is easily adhered to the sealant layer of the bag-forming film and the fastener is easily formed. Various inventions have been disclosed, such as a device that sometimes does not slip.

[0003] For example, Japanese Patent Application Laid-Open No. 1-279062 discloses a fastener in which a fusion portion to a bag body is formed of at least an ionomer resin and which can arbitrarily adjust the mating strength, the opening property, and the like. In addition, Japanese Patent Application Laid-Open No. 2-2585
No. 62 discloses a fastener in which a fused portion to a bag body is formed of at least ethylene and an acrylic acid-based random copolymer resin. Furthermore, 3-49
In 822, when forming a rib portion on the flange portion of the fastener for the purpose of preventing a hand from slipping when opening the fastener, a rib having a height of 0.23 mm to 0.05 mm per 2.54 mm width is formed. It is disclosed that seven to twenty-four fasteners can be formed without extruding ribs during extrusion.

[0004] In recent years, machines have been developed to automate the filling of foods and granules with an automatic filling machine, and heat sealing. However, in these machines, as shown in FIG. ) And the method of filling the content from the bottom of a flat bag or a pillow bag with a horizontal gusset and having the fastener D as it is, and then heat-sealing the bottom (F2) is used exclusively. H to H ′ are cut and opened during F1. However, in the case of a standing pouch-type bag as shown in FIG. 22, which has been frequently used due to the necessity of display, the bag cannot be filled from the bottom of the bag, as shown in FIGS. 23 and 25. A method is used in which the fastener D is opened, the contents M are filled, the fastener is re-engaged, and then the portion F on the fastener of the bag is heat-sealed and sealed. There is a problem that a substance tends to adhere to the fastener and become clogged, and the filling speed is significantly reduced.

[0005] To solve these problems, FIG.
26, as shown in FIG. 26, after filling the contents M with the engaged fastener D fixed to one side of the bag, the surface of the fastener constituting member D2 and the film C are fused and simultaneously the fastener of the bag forming film is formed. A method of sealing by heat-sealing the portion F above the-portion is used. There is also a bag in which the joint surfaces of the bag forming films intersect with the openings of the fastener. This bag is a bag in which the sealing surfaces F3 of the films C cross each other at a position other than the end of the fastener D as shown in FIG.
J ′ includes an envelope sticking bag as shown in FIG. 15, a pillow bag as shown in FIG. 16, a gusset bag as shown in FIG.

In these bags, as shown in FIG. 18, the flow direction (arrow K1) of the film at the time of bag making.
And the flow direction of the fastener D (arrow K2) intersects at a substantially right angle. The flat bag or the standing pouch shown in FIG. 12 has a film flow direction (arrow K1) and a fastener flow direction (arrow K2). There is a great difference from K2) being the same. Furthermore, there is a bag using a fastener having substantially no flange. In this method of manufacturing a bag, a fastener constituted by male and female claws of a fastener and a very small flange as shown in FIG. 27 is used, and a fastener component D1 and a bag forming film C1 are formed by an upper heat seal bar. Then, the fastener component D2 and the film C2 are fused with the lower heat seal bar, but they may be fused simultaneously at the top and bottom. In this case, the bag-forming film C
In many cases, a single-layer film is used, which has a problem that the appearance of the film is wrinkled or pulled.

The bag is manufactured by an automatic filling machine in which the contents are filled in a state where the engaged fastener is fixed to one side of the bag and then sealed, and the sealing surface between the bag forming films is formed by the fastener. It is substantially impossible to insert a cooling receiving bar for preventing fusion or thermal deformation between the flanges of the fastener in the manufacture of a bag that crosses the opening of the fastener, and has substantially no flange. Even in the manufacture of bags using fasteners, there is no flange, so no cooling receiver bar can be used. But,
When the fastener and the sealant layer of the bag-forming film are bonded together without using the cooling receiving bar and the fastener is engaged, the heat seal temperature and the bag making speed are strictly controlled to maintain a very stable operation state. If you can,
The fastener can be bonded to the sealant layer of the bag without thermal deformation of the claws or fusion or blocking of the fasteners, but depending on the condition of the film, fastener or contents. Small changes in operating conditions, such as changes in bag speed, changes in film, fastener or contents temperature, or machine temperature, can cause blocking and deformation, and lower the heat seal bar temperature to prevent this. In addition, a slight change in the operating state causes poor adhesion of the heat seal portion.

As a result, when a machine having a large error due to these factors is used, the yield is drastically reduced, resulting in poor economy. A machine with a small error has a high equipment cost and causes a problem in economical efficiency in producing a small lot. ing. These factors are:
Large fluctuations in the overall yield, and strict control of the temperature of the heat-seal bar and strict control of the heat-seal time require a large amount of equipment cost, which is economically disadvantageous especially in the production of small lots. Has occurred. However, the relationship between the structure of the zipper-equipped bag body which can solve these problems, the appropriate material composition, the heat sealing time and the temperature range has not yet been disclosed.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a state in which the fastener is engaged without strictly controlling the temperature of the heat sealing bar and strictly controlling the heat sealing time even when the cooling receiving bar cannot be used. To provide a fastener-attached bag which can stably adhere the fastener to the sealant portion of the bag without causing poor bonding, blocking or deformation.

[0010]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that the above objects can be achieved by selecting the structure and material of the bag-forming film and the fastener. Is reached. That is, the present invention provides: (1) Formulas (1) and (2) wherein one or both of the joining surfaces of the plastic fastener and the bag-forming film are formed on the sealant layer of the bag-forming film and the surface of the plastic fastener body. A bag with a plastic fastener, which is joined by fusion with a fusion resin layer having a melting point satisfying the following condition: T _ft (° C.)-T _fs (° C.) = + 10 to +80 (° C.) ··· (1) T _s (° C.)-T _fs (° C.) = − 10 to +60 (° C.) (2) (where T _ft is the melting point of the plastic fastener body, T
_fs is the melting point of the fusion resin layer, T _s is the melting point of the sealant layer of the bag forming film, representing respectively. (2) The plastic fastener according to the above (1), wherein the plastic fastener has a flange on each of the male nail side and the female nail side, and has two or more projections having a height of 50 μm or more on the nail side surface of the flange. (3) The bag according to the above (1) or (1), which is manufactured by an automatic filling machine in which the contents are filled in a state in which the engaged fastener is fixed to one surface of the bag and then sealed. 2) bag with plastic zipper,

(4) The bag with the plastic fastener according to the above (1) or (2), wherein the joining surfaces of the bag forming films cross each other with the opening of the plastic fastener. (5) The plastic fastener is substantially (1) a bag with a plastic fastener according to the above (1), which does not have a flange; and (6) a fusion or thermal deformation of a joint between the sealant layer of the bag-forming film and the fusion resin layer of the plastic fastener. The method for producing a zipper-equipped bag according to any one of the above (1) to (5), wherein the method is performed without using a cooling receiving bar for prevention; and (7) the method according to the above (1) to (5). A package wherein any one of the zipper-equipped bags is filled with the contents.

As described above, in the present invention, the fusion resin layer is provided on the surface of the fastener body, and the melting point [T _fs (° C.)] of the fusion resin layer is determined by the melting point [T _ft ( ° C)] and the melting point of the fastener body [T
_s (° C.)] to satisfy the expressions (1) and (2). That is, first, as in the formula (1), the melting point of the fusion resin layer provided on the surface of the fastener body is lower than the melting point of the fastener body, and the difference in the melting points is 10 to 80 ° C, preferably 20 to 60 ° C. is necessary. This melting point difference is 1
If the temperature is lower than 0 ° C., blocking or deformation tends to occur at high temperatures and long heat sealing times, and poor adhesion tends to occur at low temperatures and low heat sealing times. That is, the allowable error range of the heat sealing conditions is narrow. For example, for a fastener in which the entire fastener is made of the same material including the surface in contact with the sealant layer, the temperature error of the heat seal bar is 20 ° C., the sealing time is The heat seal is unstable in the heat seal fluctuation range with an error of 0.2 seconds, and the yield of the product is poor, which is not practical.

On the other hand, if the difference in melting point exceeds 60 ° C., the melting point of the fastener body may be 20 points lower than the melting point of the sealant layer of the bag-forming film as long as the formula (2) is satisfied.
It will be higher than ℃. Although the melting point of the fastener body may be higher than the melting point of the sealant layer, the melting point of the fastener body may be higher in a three-side sealed bag body in which both ends of the fastener need to be heat-sealed together with the bag forming film. If the melting point is higher than the melting point of 20 ° C. or more, the heat sealing time may be increased to substantially decrease the bag making speed, or defects such as insufficient tensile strength may be generated in the heat seal portions at both ends of the fastener. In particular, when an aluminum foil is laminated, if the melting point of the surface of the fastener to be bonded is higher than the melting point of the sealant layer by 20 ° C. or more, the sealant layer is excessively heated, and the sealant layer that protects the aluminum foil is melted. This causes inconveniences such as thinning and cracking of the aluminum foil.

Further, as in the formula (2), the melting point of the fusion resin layer provided on the surface of the fastener body is preferably between 10 ° C. and 60 ° C. lower than the melting point of the sealant layer of the bag-forming film. Needs to be between the same temperature and 40 ° C. lower. When the melting point of the fusion resin layer is higher than the melting point of the sealant layer by more than 10 ° C.,
Since the sealant layer melts before the surface of the fastener melts and flows out from the bonding surface, it is impossible to maintain an appropriate sealing strength. This tendency is remarkable in a bag body laminated with aluminum foil. In addition, when a single-layer film is used for the bag, the strength of the film at the boundary surface with the heat seal portion is extremely reduced, and the bag may be broken when the contents are filled. On the other hand, when the melting point of the fusion resin layer is a temperature lower than the melting point of the sealant layer by more than 60 ° C., only the fusion resin layer is melted and extruded to a position other than the bonding portion.
Defects such as insufficient tensile strength occur in the heat seal portion.

Next, the present invention will be described with reference to the drawings. FIGS. 1, 2 and 3 show a method of joining fasteners in the manufacture of a bag by an automatic filling machine in which the contents are filled and sealed after the engaged fastener is fixed to one side of the bag. is there. After filling the contents M into the bag C in which the fasteners engaged as shown in FIG. 1 are fixed to one side of the bag, as shown in FIG. 2, the bag forming film C is placed on the flange portions of the fastener components D1 and D2. In the meantime, the heat sealing bar A is used for heating and pressure contact without using the cooling receiving bar, and at the same time, the upper part of the fastener is also heated and pressed for contact with the heat seal bar A. As a result, as shown in FIG. 3, the fusible resin layer and the sealant layer of the fastener component member D2 are fused to each other, whereby the fastener is fixed and the bag sealed with the seal portion F is obtained. At this time, the heat seal bar A is coated with a fluorine resin or the like for preventing blocking with the bag body forming film C,
The temperature of the metal part is maintained between 30 ° C. and 60 ° C. above the appropriate heat seal temperature of the sealant.

In the case of the bag body in which the joining surface of the bag-forming film intersects with the opening of the fastener, it intersects at right angles to the film flow direction (arrow K1) during bag making as shown in FIG. First, one of the male and female fastener components is fused together with the fastener engaged at the position, and then the bag forming film C is sealed. 19 shows a cross section taken along line NN 'of the bag obtained at this time, and FIG. 21 shows a cross section taken along line pp' of FIG. 19. The bag has the same shape as that shown in FIG. As shown in FIG. 27, a bag-making method using a fastener having substantially no flange includes a fastener formed by male and female claws of the fastener and a very small flange portion. D
It can be seen that the process of fusing the film C1 with the film C1 and then fusing the fastener component D2 and the film C2 with the lower heat seal bar is the same as that shown in FIGS.

In these methods, as long as the conventional formulas (1) and (2) are satisfied, a cooling receiver bar for preventing fusion and thermal deformation of fasteners is not used. The nail part may be deformed by heat,
Adhesion between the fastener and the sealant layer of the bag without mutual fusion or blocking can be performed over a wide range of heat sealing conditions, for example, a temperature error of the heat seal bar of 40 ° C and a sealing time error of 0 ° C. Stable heat sealing can be performed even when the temperature error of the heat seal bar is 2 ° C. and the sealing time error is 0.4 second. In the present invention, when the fastener has a flange portion, as shown in FIGS. 8 and 10, two or more protrusions having a height of 50 μm or more may be provided on the claw side surface of the flange. By doing so, the allowable error range of the heat sealing condition can be set to, for example, the fluctuation temperature error 4 of the heat sealing bar.
The temperature can be made as wide as 0 ° C. and the sealing time error can be as large as 0.4 second, and a stable bag can be manufactured.

As described above, various fasteners made of different materials have already been disclosed. For example, JP
JP-A-279062 discloses a fastener in which a fused portion to a bag body is formed of at least an ionomer resin. Japanese Patent Application Laid-Open No. 2-258562 discloses a fastener in which a fused portion to a bag body is formed of at least ethylene and an acrylic acid-based random copolymer resin. In both inventions, the fastener portion other than the ionomer resin or the ethylene-acrylic acid random copolymer resin forming the fusion portion of the fastener to the bag body is a constant density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic. Acid copolymer, low crystalline ethylene-α-
An olefin copolymer, and a product further added with an elastomer or the like are mentioned. However, it only discloses that the effect of increasing the number of fasteners can be adjusted arbitrarily, such as the engagement strength and openability of the fastener, but does not describe any other effects. In addition, even if these known fasteners are used, the range of use, and the material composition, as in the present invention, the use of the fastener formed by a specific combination thereof allows the cooling bar to be used. However, there is no disclosure yet that a stable heat seal can be performed even with a machine having a large error in a state where a fastener is engaged, and that the error range of the machine is clarified.

It is also known to provide a projection on the nail-side surface of the fastener. For example, Japanese Patent Publication No. 3-49822 discloses that when forming a rib portion on a flange portion of a fastener for the purpose of opening the fastener without slipping the hand when opening the fastener, a height of 0.23 mm to 0.05 mm is required. It is disclosed that a fastener provided with seven to twenty-four ribs per 2.54 mm width can be formed without extruding a rib portion during extrusion molding. However, it is not described that by adding projections to the combination of the use method, the use range, and the material configuration described above, the allowable error range of the heat sealing condition when the cooling bar is not used in a state where the fastener is engaged is further increased.

[0020]

Next, the present invention will be described in more detail with reference to examples and comparative examples, but these examples do not limit the present invention in any way.

COMPARATIVE EXAMPLE 1 Using a continuous heat seal test machine modified from a bag making machine, a polyamide resin film having a thickness of 20 μm and a L-LDPE resin film having a melting point of 120 ° C. and a L-LDPE resin film having a melting point of 120 ° C. were used as a sealant layer. The film is made of L-LDPE having a melting point of 120 ° C., and the width of the nail is 1.8 mm and the height is 1.8 mm, inside the bag-forming films C1 and C2 with the sealant layer inside. As shown in FIG. 7, a tape-shaped fastener composed of fastener constituent members D1 and D2 having a width including the flange of 12 mm and a thickness of the flange of 180 μm as shown in FIG. 7 was arranged in an engaged state. First, the cooling bars B1 and B2 cooled to 40 ° C. are inserted between the flanges of the members D1 and D2, and the member D1 and the film C1 are joined by pressing the heat seal bar A1 coated with a fluorine-based resin. And the state shown in FIG. Subsequently, as shown in FIG. 6, without inserting the cooling bars B1 and B2 into the flange portion of the fastener, a heat seal bar A2 coated with a fluororesin is pressed into contact to join the member D2 and the film C2. A heat seal test was performed.

Generally, heat sealing machinery has an allowable error range at the time of heat sealing. In this example, in order to quantify the error range, the temperature of the heat seal bar A2 is set to 170 °.
Between 150 ° C and 190 ° C
Two levels when the temperature is changed to 0 ° C., and the sealing time is set to 0.1.
Four types of heat seal tests as shown in I to IV in Table 1 in a combination of two levels, when varying from 6 seconds to 0.8 seconds and when varying from 0.4 seconds to 0.6 seconds. Was done. 10 each so as not to be affected by the cycle of fluctuation
00 samples were prepared, and 100 samples were taken out at random from among them, and the heat sealing condition was inspected for the 100 samples. Good adhesion (symbol A) or poor adhesion (symbol B) or blocking or deformation (symbol C) ), And the number of defective products (symbols B and C) was counted. Table 2 shows the results.

According to the results, there are many blockings and deformations at a high temperature and a long heat sealing time, and at a low temperature and a low heat sealing time, adhesion failure is apt to occur and the heat sealing property is unstable. When a machine having a sealing time error of 0.2 seconds was used, it was judged that the device was not practical.

Comparative Example 2 A heat seal test was performed in exactly the same manner as in Comparative Example 1 except that the material of the fastener was a modified PE resin having a melting point of 100 ° C. Sampling, evaluation and data processing were performed in the same manner as in Comparative Example 1, and the results are shown in Table 2. In all cases, blocking and deformation of the fastener were apt to occur, and the heat sealability was unstable, Heat seal temperature error 2
When a heat sealing machine having 0 ° C. and a sealing time error of 0.2 seconds was used, it was judged that the method was not practical.

Example 1 As shown in FIG. 8, the thickness of a fastener body (material: L-LDPE having a melting point of 120 ° C.) including a flange portion, made of a modified PE resin having a melting point of 100 ° C. Comparative Example 1 except that a 30 μm fusion resin layer R was provided.
A heat seal test was performed in exactly the same manner as described above. Sampling, evaluation, and data processing were performed in the same manner as in Comparative Example 1. The results are shown in Table 2. The heat seal temperature error was 40 ° C., the seal time error was 0.2 seconds, or the heat seal temperature error was 20 ° C. It was confirmed that stable heat sealing was achieved in a wide range with a time error of 0.4 seconds, and the practicality was excellent.

Comparative Example 3 Although the fastener used in Comparative Example 1 had the same resin composition and nail shape, five fasteners were formed on the inner surface of the 180 μm thick flange formed on both sides of the male and female nails. A heat seal test was performed in exactly the same manner as in Comparative Example 1, except that a tape-shaped fastener as shown in FIG. 9 having ten protrusions having a width of 0.7 mm and a height of 0.05 mm was used. Sampling, evaluation and data processing were performed in the same manner as in Comparative Example 1, and the results are shown in Table 2.
It was confirmed that poor adhesion was apt to occur at low temperature and low heat sealing time, and it was unstable.

Example 2 A fastener body including a flange portion (material: melting point 120
(L-LDPE at 100 ° C.) with a 30 μm-thick resin layer made of a modified PE resin having a melting point of 100 ° C. on the joint surface with the bag-forming film, and a 180 μm thick formed on both sides of each male and female nail. Comparative Example except that a tape-shaped fastener as shown in FIG. 10 was used, in which a total of ten protrusions each having a width of 0.7 mm and a height of 0.05 mm were formed on the inner surface of each of the flange portions. A heat seal test was conducted in exactly the same manner as in Example 1. Sampling in the same manner as in Comparative Example 1,
Evaluation and data processing were performed, and the results are shown in Table 2. The heat seal temperature error was 40 ° C., and the seal time error was 0.
It was confirmed that stable heat sealing was achieved under the conditions within a range of 4 seconds, and that this was the most practical.

Embodiment 3 A fastener body including a flange portion (material: melting point 120
A heat seal test was performed in exactly the same manner as in Comparative Example 1 except that a resin layer having a thickness of 30 μm and made of L-LDPE resin having a melting point of 110 ° C. was provided on the bonding surface of the L-LDPE at 110 ° C. with the bag-forming film. Was. Sampling, evaluation, and data processing were performed in the same manner as in Comparative Example 1. The results are shown in Table 2. The heat seal temperature error was 40 ° C., the seal time error was 0.2 seconds, or the heat seal temperature error was 20 ° C. The heat sealing was performed in a wide range with a time error of 0.4 seconds, and it was determined that it was practical.

Example 4 The material of the fastener body is HDPE resin having a melting point of 140 ° C., and a resin having a thickness of 30 μm made of a modified PE resin having a melting point of 80 ° C. is provided on the joint surface of the fastener body including the flange portion with the bag forming film. A heat seal test was performed in exactly the same manner as in Comparative Example 1 except that a layer was provided. Sampling, evaluation, and data processing were performed in the same manner as in Comparative Example 1, and the results are shown in Table 2.
It was confirmed that stable heat sealing was achieved under the conditions of ° C. and a sealing time error of 0.4 seconds, which was very practical.

Example 5 As a bag-forming film, a 15 μm-thick L-LDPE was laminated as a sealant layer on a 12 μm-thick PET film slit to a width of 290 mm. A film obtained by welding the same fastener as in Example 2, which was cut to a length of 100 mm at a position 95 mm from each end and perpendicular to the flow direction of the film at regular intervals as shown in FIG. 18D,
As shown in FIGS. 20 and 21, the width is 5 m in the film flow direction.
m to form a cylindrical film that is formed by bonding both ends of the film, and then the adhesive surfaces of the bag-forming films cross each other at the opening of the plastic fastener and at the center of the opening,
The seal bar temperature and the heat sealing time were changed in the same manner as in Comparative Example 1 using the same adhesion tester as in Comparative Example 1 while maintaining the state shown in FIG. Various types of adhesion tests were performed. Sampling, evaluation, and data processing were performed in the same manner as in Comparative Example 1. The results are shown in Table 2. All the samples had good adhesion (symbol A), a heat seal-temperature error of 40 ° C., and a heat seal time error of 0. It could be determined that it could be easily manufactured with a heat sealer in the range of .4 seconds.

Comparative Example 4 An adhesion test similar to that of Example 5 was performed using the same film as that of Example 5 and the same fastener as that of Comparative Example 1. Sampling, evaluation and data processing were performed in the same manner as in Comparative Example 1, and the results are shown in Table 2. The results are shown in Table 2. The portion where the bonding surfaces of the bag-forming films crossed the opening of the plastic fastener and both ends of the bag. Insufficient adhesion of the plastic fastener (symbol B) was found at the fold portion of the heat seal, and blocking and deformation occurred at high temperature / long time heat sealing.
It was determined that heat sealing could not be performed with a heat sealing machine in the range of 2 seconds.

Example 6 A nail having a width of 1.8 m in a state where a fastener is engaged.
mx height 1.8mm, fastener width including flange 2.5mm, flange thickness 180μm, body material is L-LDPE with melting point of 120 ° C. Melting point 100 on bonding surface
80 μm thick fused resin layer R made of modified PE resin
28, the fastener having an opening strength of 5-7 kgf / 5 cm on one side of the fastener and 1.5-2 kgf / 5 cm on the other side is substantially free of a flange. 40μm thick and material 1 melting point
It is installed between _two single-layer films C ₁ and C ₂ of L-LDPE at 20 ° C., and both sides of the fastener are simultaneously heated with heat seal bars A ₁ and A ₂ whose surfaces are coated with fluorine resin from both sides of the fastener. Seal.

In general, if the temperature of the heat seal bar is too high in a single-layer film, the film may wrinkle or the film may be melted. Therefore, the temperature range of the heat seal bar is 140 ° C. to 160 ° C. And the heat sealing time is changed from 0.4 seconds to 0.6 seconds and 0.6 seconds.
2 levels from second to 0.8 seconds, total 2 levels (V, V in Table 1)
The heat sealing test of I) was performed. Sampling, evaluation, and data processing were performed in the same manner as in Comparative Example 1. In addition, the opening strength of one side of the fastener after the test was measured, and a case out of the range of 5 to 7 kgf / cm was also regarded as a deformation (symbol C). The experimental results are as shown in Table 2. Under these conditions, the film in the heat-sealed portion did not wrinkle or break. As a result, when the heat sealing temperature error was 20 ° C., it was determined that stable heat sealing could be performed even if the sealing time error was 0.4 seconds.

Comparative Example 5 The same single-layer film as in Example 6 and the same shape as in Example 6, but the entire fastener was formed of a modified PE resin having a melting point of 100 ° C., and the opening strength was 3 to 5 on one side of the fastener.
A test similar to that of Example 6 was performed using a fastener of 5 kgf / 5 cm and 1-2 kgf / 5 cm on the other side. Sampling, evaluation, and data processing were performed in the same manner as in Comparative Example 1. In addition, the opening strength of one side of the fastener after the test was measured, and a case out of the range of 3 to 5 kgf / cm was also regarded as a deformation (symbol C). The results are as shown in Table 2. The film surface had good adhesion without wrinkles, etc., but from this result, the nail portion of the fastener was deformed and the fitting strength was changed, so there was no practicality. It was determined.

[0035]

[Table 1]

[0036]

[Table 2]

[0037]

According to the present invention, there is provided a bag with a plastic zipper, wherein the bag is manufactured by an automatic filling machine in which the contents are filled and sealed after the zipper is fixed to one side of the bag. Even in a method of manufacturing a bag in which a cooling receiving bar cannot be used, such as manufacturing of a bag in which the sealing surface of the constituting film crosses the opening of the fastener and manufacturing of a bag using a fastener having substantially no flange, It can be manufactured stably within a relatively wide allowable range of heat sealing.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment of the present invention, in which a content is filled in a method of manufacturing a bag by an automatic filling machine in which the contents are filled and sealed after the engaged fastener is fixed to one surface of the bag. It is a stump face showing the state at the stage of filling.

FIG. 2 is a cross section showing a heat sealing step in the case of FIG. 1;

FIG. 3 is a cross-sectional surface showing a state at the stage when heat sealing is completed in the case of FIG. 1;

FIG. 4 is a cross-sectional view showing a method of fixing the engaged fastener to one bag forming film surface using a cooling receiving bar.

FIG. 5 is a cross-sectional view showing the state of the bag obtained by the method of FIG. 4 in which the engaged fasteners are fixed to one side of the bag.

FIG. 6 is a cross-sectional view showing a method of fixing the other surface of the fastener of the bag shown in FIG. 5 to a bag forming film surface.

FIG. 7 is a perspective view showing a conventionally used plastic fastener.

FIG. 8 is a perspective view showing a plastic fastener provided with ribs on a conventionally used flange.

FIG. 9 is a perspective view showing a plastic fastener provided with a fusion resin layer on upper and lower surfaces used in the present invention.

FIG. 10 is a perspective view showing a plastic fastener used in the present invention, in which a fused resin layer is provided on upper and lower surfaces and a rib is provided on a flange.

FIG. 11 is a cross-sectional view showing a method of simultaneously fixing both surfaces of the engaged fastener to the bag-forming film surface while using the cooling receiving bar.

FIG. 12 is a perspective view showing a continuous bag obtained by the method of FIG. 11;

FIG. 13 is a perspective view showing a bag used in an automatic packaging machine in a form of filling contents from the bottom, which has a fastener which is heat-sealed on the outside except for the bottom, and has a fastener which has been engaged.

FIG. 14 is a plan view showing an example of a bag in which the sealing surfaces of the bag forming films intersect with the openings of the fastener.

FIG. 15 is a sectional view taken along line JJ ′ of one example of the bag body shown in FIG. 14;

FIG. 16 is a sectional view taken along line JJ ′ of one example of the bag shown in FIG. 14;

FIG. 17 is a sectional view taken along line JJ ′ of one example of the bag shown in FIG. 14;

FIG. 18 is a conceptual diagram showing the flow of constituent materials in a method of manufacturing a bag in which the sealing surfaces of the bag-forming films intersect with the openings of the fastener.

FIG. 19 is a sectional view taken along the line NN ′ of the bag shown in FIG. 18;

20 is a sectional view showing a state immediately before folding of the bag shown in FIG. 17;

21 is a sectional view taken along the line PP ′ of the bag shown in FIG. 20.

FIG. 22 is a perspective view of an example of a standing pouch-type bag.

FIG. 23 is a sectional view taken along line LL ′ of one example of the bag shown in FIG. 22;

FIG. 24 is a sectional view taken along line LL ′ of one example of the bag body shown in FIG. 22;

25 is a cross-sectional view taken along line QQ ′ of an example of the bag shown in FIG.

FIG. 26 is a sectional view taken along line QQ ′ of an example of the bag shown in FIG. 24 (in a state where contents are put in the bag).

FIG. 27 is a perspective view showing a method of fixing and fixing a fastener having substantially no flange.

FIG. 28 is a perspective view showing a plastic fastener having a fusion resin layer on upper and lower surfaces and having substantially no flange, which is used in the present invention.

[Explanation of symbols]

A, A ₁ , A ₂ : Heat seal bar B, B ₁ , B ₂ : Cooling receiving bar C, C ₁ , D ₂ : Bag forming film D: Plastic fastener D1, D2: Fastener component E: Rib F, F ₁ , F ₂ : Heat seal portion K ₁ , K ₂ : Moving direction M: Contents R: Fused resin layer

Claims (7)

[Claims] 1. One or both of the joining surfaces of the plastic fastener and the bag-forming film satisfy formulas (1) and (2) formed on the sealant layer of the bag-forming film and the surface of the plastic fastener body. A bag with a plastic zipper, which is joined by fusion with a fusion resin layer having a melting point. T _ft (° C.)-T _fs (° C.) = + 10 to +80 (° C.) (1) T _s (° C.)-T _fs (° C.) = − 10 to +60 (° C.) (2) (Where T _ft is the melting point of the plastic fastener body, T
_fs is the melting point of the fusion resin layer, T _s is the melting point of the sealant layer of the bag forming film, representing respectively. ) 2. The plastic fastener has a flange on each of a male nail side and a female nail side, and has two or more projections having a height of 50 μm or more on the nail side surface of the flange. A bag with a plastic zipper as described in 1 above. 3. The plastic fastener according to claim 1, which is manufactured by an automatic filling machine in a form in which the contents are filled and sealed after the engaged fastener is fixed to one surface of the bag body. With bag. 4. The bag with a plastic fastener according to claim 1, wherein the bag-forming film has a structure in which the joining surfaces of the films cross each other with the opening of the plastic fastener. 5. The bag with the plastic fastener according to claim 1, wherein the plastic fastener has substantially no flange. 6. The method according to claim 1, wherein the bonding of the sealant layer of the bag-forming film and the fusion resin layer of the plastic fastener is performed without using a cooling receiving bar for preventing fusion or thermal deformation. A method for manufacturing the bag with a fastener according to claim 1. 7. A package, wherein contents are filled in the zipper-equipped bag according to any one of claims 1 to 5.