JP2003312689A - Packaging bag and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag which can be simply manufactured without needing a special apparatus, equipment or the like, is applicable to any shape and can be opened/closed any number of times, and to provide a method of manufacturing the bag. <P>SOLUTION: An adhesive which has hardly adhesion at ordinary temperature and exhibits adhesion by heating, or pressurizing after heating, or simultaneously heating and pressurizing is directly applied on a part of at least a base material of the bag, preferably on a surface layer of a plastic film, preferably on the internal surface layer. During the manufacture of the bag or after the manufacture, the adhesive is heated, or pressurized after heating, or simultaneously heated and pressurized. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag having a pressure-sensitive adhesive layer in the opening / closing part, which has a pressure-sensitive adhesive that develops pressure-sensitive adhesive force by heating, or after heating and / or pressing simultaneously. The manufacturing method is related.

[0002]

2. Description of the Related Art Confectionery, delicacies, vegetables and other foods, medicines, poultices, and other medicinal products should be opened and a part of the contents removed, and then the bag closed again to prevent moisture and the like. There are things you need to save the rest. Conventionally, as a packaging bag used for such an application, one provided with a pair of plastic zippers composed of a convex band and a concave band has been widely used. However, in such a packaging bag, it is difficult to accurately align the unevenness, and a specially expensive bag-making machine is required, and the manufacturing process is inevitably complicated. Furthermore, it is necessary to strongly trace from both sides of the chuck for fitting, and it may be difficult for a child or the like to fit completely.

In order to solve such drawbacks, a packaging bag using an adhesive instead of the zipper has been proposed. For example, in JP-A-2000-62810, a packaging bag using a double-sided adhesive tape is disclosed in JP-A-2000-281088.
The publication discloses a packaging bag in which a tape having a plastic layer and an adhesive layer is heat-sealed. However,
These have the disadvantages that a special device is required for mounting the tape and that the manufacturing process is complicated because the adhesive layer cannot be provided at the same time during bag making. There is also a problem that the cost is increased because the tape that can be used is used.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, can be manufactured extremely easily without requiring special materials and equipment, and can open and close the packaging bag. It is an object of the present invention to provide a packaging bag that is simple and has excellent sealing property.

[0005]

The above-mentioned object of the present invention is to heat a packaging bag, or pressurize after heating, or heat at the same time.
This is achieved by providing a pressure-sensitive adhesive layer that exerts pressure-sensitive adhesive force by applying pressure. That is, the present invention provides (1) a packaging bag in which a pressure-sensitive adhesive layer is directly formed on at least a part of the surface layer of the bag, wherein the pressure-sensitive adhesive layer is heated, or pressurized after heating,
Alternatively, a packaging bag characterized by being a layer obtained by heating an adhesive that develops adhesive force by heating and pressurizing at the same time,
(2) The packaging bag according to the above (1), wherein a part of the surface layer on which the pressure-sensitive adhesive layer is formed is a plastic layer, and (3) the surface layer is an inside surface layer of the bag. The packaging bag according to (2), the packaging bag according to (4) is a bag sealed by heat sealing, and the packaging bag according to (3) above, wherein the adhesive layer is at least the entire inner surface layer on one side of the bag. The packaging bag according to the above (3) to (4), which is formed in
(6) The packaging bag according to (4) above, further including a heat-sealing portion adjacent to the adhesive layer,
(7) After applying a pressure-sensitive adhesive that exerts an adhesive force to at least a part of the surface layer of the base material of the bag directly, by heating, or by applying pressure after heating, or by simultaneously applying heat and pressure, during bag making or The present invention provides a method for producing a packaging bag that can be repeatedly opened and closed, characterized by heating the pressure-sensitive adhesive after bag making, or applying pressure after heating, or simultaneously heating and pressurizing.

Heating or pressurizing after heating according to the present invention, or
Is an adhesive that develops adhesive strength by heating and pressing at the same time
Agents such as plastic films and aluminum
After coating and drying on films and sheets such as metal foil and paper
(Desolvent), according to the blocking measurement method described below
Evaluate the blocking, and the level of blocking is
At a level of "2" or less, or 70 degrees when attached to an adherend
C, Adhesion of 1g / 25mm width or more by heating for 0.5 seconds or more
It is an adhesive that gives good properties. Blocking measurement method Equipment used 1. Precision constant temperature dryer (100V ・ 1KV ・ ± 0.1 ℃) 2. Glass plate (80 × 60 mm, thickness 3 mm 2
Sheet) 3. Medicine wrapping paper (80 x 60 mm, number of sheets according to the number of samples) 4. Lead weight (weight 2.7 kg, with flat surface) 5. Dessicator 6. Sulfuric acid solution (27.1 ± 0.5%) Evaluation methodssampling The test piece consists of a sample with a length of 60 mm and a width of 50 mm.
Collect to size.Stacking Overlap the adhesive-coated surface of the test piece of the previous section with the surface to be adhered.
And a set of medicine wrapping paper on both outer sides
As a set, prepare 5 sets for each sample and stack them one after another.
Itload Place the samples stacked in the previous section on a glass plate and
Also put a glass plate. Furthermore, by stacking a lead weight on this,
90 g / cm^TwoTo the load.Measurement environment Fill this sample with sulfuric acid solution (27.1 ± 0.5%) at the bottom
Put them in the desiccator that you have stacked, and put the lid on.
To do. This desiccator was previously dried at 40 ℃
Preheat it in the vessel and keep it at 40 ° C even after adding the sample.
Leave for 24 hours.Evaluation methods After 24 hours, take out the sample and remove the glass plates on both sides.
The surface of the forefinger's nail with the squares stacked.
Knock 3 times lightly and use the following procedure to block the adhesive coating area.
To determine the longevity.Blocking level 1: It can be easily peeled off by simply tapping the square. 2: Easy when rubbed between two fingers
Peel off. 3: Peel easily by pinching with both fingers and pulling apart. This
In the case of, the adhesive layer cannot be peeled off. 4: Plucked with both fingers and peeled off, but sticky
The adhesive layer also peels off, leaving a trace of close contact. 5: The adhesive layer is completely adhered.Evaluation results This was judged for each sample, and the average value of 5 sets was
Use the results of the sample

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings. 9, 10, and 11 show a layer of a pressure-sensitive adhesive (hereinafter, also simply referred to as a pressure-sensitive adhesive) and a base material for a bag, which develops a pressure-sensitive adhesive force by heating, pressurizing after heating, or heating / pressurizing at the same time. 2 is an embodiment showing a laminated structure of. In FIG. 9, the adhesive 3 is directly applied to the plastic film 11,
FIG. 10 shows a case where the adhesive 3 is directly applied to the plastic film layer of the base material in which the plastic film 11 and the other simple substance 12 are laminated, and FIG.
The adhesive 3 is directly applied to the outer surface layer and the inner surface layer of the base material in which 1 and the other simple substance 12 are laminated.

1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 8, FIG. 12 and FIG. 13 show one embodiment of the packaging bag of the present invention. 4, FIG. 5, FIG. 6, FIG. 12, and FIG. 13, the inner surface layer is provided with an adhesive layer, and in FIG. 8, the outer surface layer is provided with an adhesive layer. FIG. 7 shows the heat-sealed portion 2 on the upper portion of the packaging bag of FIG.
FIG. 14 is a partially cutaway perspective view showing a state of being cut out and opened, and FIG. 14 is a partial perspective view showing a state where the adhesive layer 3 on the upper portion of the packaging bag of FIG. 13 is opened. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 8, FIG. 12 and FIG. 13, 1 is a packaging bag, 2 is a heat seal part, 3 is an adhesive layer, 4 is a notch, 5 Is a cut end when cut with a notch, and 6 is an inner surface of the bag.

FIG. 1 shows an example in which the pressure-sensitive adhesive layer 3 is formed transversely to a bag, which is preferably used for packaging food such as rice confectionery, candy, seasonings and dairy products. ,
It can be used for various purposes such as industrial applications including bolts and nuts, industrial applications, pharmaceuticals, and the like. Figure 2
Is an example in which the pressure-sensitive adhesive layer 3 is formed by digging into the heat-sealed portion 2 and is suitable for use in increasing the degree of sealing, as well as applications such as a bag containing a deoxidant absorbent, a bag containing nitrogen, a retort bag, and a vacuum bag. It can be used for packaging used for. 3 and 4
Is an example in which the pressure-sensitive adhesive layer 3 is formed in an arbitrary shape when the content has a deformed shape such as a triangle or a circle, and is suitable for a package used for a container, an injection-molded product, a toy, and miscellaneous goods. ing. FIG. 5 shows an example applied to a pillow packaging bag. Figure 6
Has a pressure-sensitive adhesive layer 3 formed in a broken line shape and can evaporate water and the like because there is a portion which is not applied, and is particularly suitable for packaging fresh food such as vegetables and fruits. FIG. 8 shows a case in which the adhesive layer 3 is formed on the outer surface layer 1 of the bag, which can be used for a package of sundries, pencils, ballpoint pens and the like. In FIG. 12, the heat-sealing portion 2 is further provided in the vicinity (inner side) of the adhesive layer 3 of the packaging bag, and the adhesive layer 3 can be separated from the contents to prevent the mixture with the contents. In the packaging bag of this embodiment, it is desirable to open the heat seal portion 2 together with the pressure-sensitive adhesive layer 3 when the bag is first opened. Figure 1
The adhesive layer 3 is formed on the entire surface of the inner surface layer of the bag, and can be used in an injection molding package, a medicine package for a medical doctor, and the like. In the embodiment of the present invention, the adhesive layer 3 is preferably an inner surface layer of the bag, and the bag is preferably heat-sealed.

In the packaging bag of the present invention, the first opening of the sealed one is to cut the lower part of the heat-sealed portion 2 on the upper part of the bag or the upper part of the adhesive layer 3 with scissors, but notch 4 on one side or It is possible to use a film which is provided on both sides and is opened, a hole is formed on the line of the bag in a broken line condition, and a film which is oriented in a tearing direction is used. In the packaging bag of the present invention, after the contents are taken out, the adhesive layer 3 is required to be sealed again.
Lightly crimp by hand and seal. In this way, opening and closing can be continued until the contents disappear from the bag.

In the packaging bag of the present invention, at least a part of the surface layer of the base material of the bag is coated with a pressure-sensitive adhesive exhibiting a pressure-sensitive adhesive force by heating directly, or after heating and / or pressing simultaneously. After that, it is manufactured by heating the pressure-sensitive adhesive during or after bag making. The base material of the bag used in the present invention is arbitrary, and examples thereof include polypropylene, polyester, nylon, polyethylene, ionomer, and E.
Examples include plastic films such as VA and the like, plastics in which these plastic films are laminated, metal foils such as aluminum, paper, and cellophane. Of these, the part to which the adhesive is applied is preferably a plastic film.

The pressure-sensitive adhesive used in the present invention has no pressure-sensitive adhesive force at room temperature, and exerts pressure-sensitive adhesive force by heating, pressurizing after heating, or heating / pressurizing at the same time. For example, it has a core-shell structure. A pressure-sensitive adhesive that contains a normal pressure-sensitive adhesive composition in the shell phase, and undergoes a phase transition by heating, or after heating or pressurizing, or simultaneously heating and pressurizing, so that the components of the suru phase become a continuous phase and develop an adhesive force. Examples include Aron Tuck TT series manufactured by Toagosei Co., Ltd., and the like.

The application of the pressure-sensitive adhesive varies depending on the application, but the outer surface layer or the inner surface layer, and the shape may be any of vertical or horizontal with respect to the packaging bag, continuous or discontinuous. The coating amount is sufficient as long as it can exhibit an adhesive force that is almost the same as that of a normal adhesive. Further, the coating width of the pressure-sensitive adhesive layer can be arbitrarily set from about 0.5 mm to the entire surface layer according to the purpose, and can be easily coated with a printing machine such as a gravure printing machine, a flexo printing machine, or a simple coating machine. .

After the base material is coated with the adhesive and dried, it is made into a bag, but at this stage there is almost no adhesive force, and there is no obstacle that the base material or the bag sticks during bag making. The filling machine can be used as it is.

The dry coating film of the pressure-sensitive adhesive is heated at the time of bag making or after bag making, or is heated and / or pressurized after heating, or simultaneously heated / pressurized. The heating or the like may be performed as long as the required adhesive strength can be exhibited, and it varies depending on the coating amount, the application, the process, etc., but the temperature is generally selected in the range from 80 ° C. to the temperature at which the substrate is stable. When a plastic film, for example, is used as the base material, it should be noted that if the heating temperature is too high, the coated surface will melt and the adhesive strength will significantly decrease.
The heating time is about 0.1 seconds to 10 minutes, and the pressurizing condition is 0.1.
About 4 kg / cm ² is sufficient.

In the packaging bag of the present invention, a notch may be provided on one side or both sides, a hole may be punched in a broken line condition, or a film oriented in a tearing direction may be used to facilitate initial opening.

The feature of the present invention is that it has almost no adhesive force at room temperature, and is heated or pressurized after heating, or heated at the same time.
The point is to use an adhesive that develops adhesive strength by applying pressure. Therefore, it is possible to directly apply the adhesive to the base material and make the bag as it is, and it is possible to open and close it repeatedly very easily without using any special device or equipment as compared with the conventional adhesive tape or the like. A packaging bag can be manufactured.

[0018]

The present invention will be described in detail below with reference to examples. In addition, the evaluation of the adhesiveness described in the examples is based on JIS.
According to Z 0237, it was measured with a universal testing machine RTA-100 manufactured by Orientec Co., Ltd. at a tensile speed of 300 mm / min, a sample width of 25 mm, and T peeling.

Example 1 Double sided heat seal type OPP 25μ (Tohcello Co., Ltd.)
WH-OP), which produces adhesive force by heating
(Toagosei Co., Ltd., Aron Tuck TT-1212B-
1) dry application amount to 15mm width with Meyer bar # 2
4.5 g / m^Two Apply and dry thoroughly with 40 ° C warm air
It was Add the same type of OPP 25μ, which is uncoated, to the adhesive
Layer up so that the layers are inside, and Tester Sangyo Co., Ltd.
Using a heat sealer TP-701 manufactured by
Heat seal (heat seal width 10 mm, 180 ° C x 1k
gf / cm^TwoX 2 min), and three three-sided bags were produced.
Two of these have the adhesive coating part at 130 ° C x 1 kgf /
cm^TwoX 2 min (10 mm width) condition
It was heated with a roller in a width of 10 mm. Of heat-treated three-sided bag
The adhesive strength was measured after leaving one at room temperature for 30 minutes.
B, initial adhesive strength 80 gf / 25 mm, readhesive strength (one
(Adhesive strength when re-pressing the peeled adhesive part)
117 gf / 25 mm, and other heat-treated
The adhesive strength was measured after leaving one sheet at room temperature for 1 day.
B, initial adhesive strength 90 gf / 25 mm, re-adhesive strength 20
With gf / 25 mm, it showed good tackiness and resealing property.
On the other hand, the other one that is not heat-treated
Similarly, when the adhesive strength was measured after leaving it at room temperature for 1 day,
The adhesion was not expressed.

Example 2 Double sided heat seal type OPP 25μ (Tohcello Co., Ltd.)
WH-OP), which produces adhesive force by heating
(Toa Gosei Co., Ltd., Aron Tuck TT-1212B-
1) dry application amount to 15mm width with Meyer bar # 2
4.5 g / m^Two Apply and dry thoroughly with 40 ° C warm air
It was Use two sheets of this so that the adhesive layers overlap each other inside
Heat sealer TP manufactured by Tester Sangyo Co., Ltd.
-701 is used to heat seal the three ends (heat seal).
Width 10 mm, 180 ° C x 1 kgf / cm^Two× 2 mi
n), and a three-sided bag was produced. Then, the adhesive coating part 1
30 ℃ × 1kgf / cm^Two× 2min (10mm width)
The packaging bag of the present invention was obtained by heating under heat activation conditions. Book bag 1
The adhesive strength was measured after leaving it at room temperature for 120 days.
Good at f / 25mm and readhesion strength of 70gf / 25mm
The bag was a resealable bag.

Example 3 Easy-adhesive CPP 25 μ (RS- manufactured by Idemitsu Unitech Co., Ltd.)
On the laminated surface of (512), an adhesive that develops adhesive force by heating (Aaron Tack TT-1212B manufactured by Toagosei Co., Ltd.)
-1) was applied to a 15 mm width with a Mayer bar # 2 in a dry coating amount of 4.5 g / m ² and sufficiently dried with warm air of 40 ° C. Corona treatment is applied to the non-coated surface of this film, and OPP20μ (P2161 manufactured by Toyobo Co., Ltd.) is bonded using an adhesive (A-969 / A-5 manufactured by Mitsui Takeda Chemical Co., Ltd.) and left at 40 ° C. for 72 hours. A laminated film was produced. Two pieces of this laminated film were used, and the pressure-sensitive adhesive layers were aligned so as to overlap each other on the inner side, and using a heat sealer TP-701 manufactured by Tester Sangyo Co., Ltd., the three ends were heat-sealed (heat-seal width 10 mm, 180 ° C. ×). 1 kgf / c
m ² × 2 min) to produce a three-sided bag. Next, the pressure-sensitive adhesive application section is set to 110 ° C. × 1 kgf / cm ² × 2 min (1
It was heated under a heat activation condition of 0 mm width) to obtain a packaging bag of the present invention. After leaving this bag for 1 day at room temperature, the adhesive strength was measured to be 75 gf / 25 mm, readhesive strength 25 gf / 25 m
The bag was as good as m and showed a resealing property.

Example 4 PE20 was added to O-Ny 15μ (BN-RX manufactured by Kojin Co., Ltd.).
A pressure-sensitive adhesive (manufactured by Toagosei Co., Ltd.) that exhibits a cohesive force by heating by corona discharge treatment of 35 to 36 dyne / cm on the PE surface of a base film laminated with μ (LC-600A manufactured by Nippon Polychem Co., Ltd.) , Arontuck TT-1212B
-1) was applied to a 15 mm width with a Mayer bar # 2 in a dry coating amount of 4.5 g / m ² and sufficiently dried with warm air of 40 ° C. An uncoated base film is laminated on this so that the pressure-sensitive adhesive layer is on the inside, and a heat sealer TP-701 manufactured by Tester Sangyo Co., Ltd. is used to heat seal the three ends (heat seal width 10 mm, 180 ℃ × 1kgf / cm
² × 2 min) to produce a three-sided bag. Then, the pressure-sensitive adhesive application part was subjected to 100 ° C. × 1 kgf / cm ² × 2 min (10
(mm) under heat activation conditions to obtain the packaging bag of the present invention.
After leaving the bag at room temperature for 1 day, the adhesive strength was measured.
380gf / 25mm, readhesion strength 100gf / 25m
The bag was as good as m and showed a resealing property.

Example 5 Easy-adhesion type CPP 25 μ (RS- manufactured by Idemitsu Unitech Co., Ltd.)
512) is subjected to corona treatment on the sealing surface, and the adhesive is used (A-969 / A-5, manufactured by Mitsui Takeda Chemical Co., Ltd.)
-Attached with NY (BN-RX manufactured by Kojin Co., Ltd.) at 40 ° C
And left for 72 hours to produce a laminated film. The film is cut into a size of 130 mm in width and 190 mm in length, and a pressure sensitive adhesive that develops an adhesive force by heating at a position of 20 to 35 mm from the upper vertical portion with a width of 15 mm (manufactured by Toagosei Kagaku Co., Ltd., Aron Tack TT-1212B- 1) to Mayer Bar # 2
With a dry coating amount of 4.5 g / m ^{2 on a} 15 mm width,
It was thoroughly dried with warm air of 40 ° C. A laminated film of the same size not coated with an adhesive was stacked on top of this so that the CPP surfaces were on the inside, and a heat sealer TP-701 manufactured by Tester Sangyo Co., Ltd. was used to heat seal the three ends ( Heat seal width 10 mm, 180 ° C x 1 kgf / cm
² × 2 min) to produce a three-sided bag. In this three-sided bag,
After filling 19 g of rice crackers of 10 g / piece, the pressure-sensitive adhesive application part is 110 ° C. × 1 kgf / cm ² × 2 min (10 mm width)
It was heated under the heat activation condition to prepare a packaging bag of the present invention. After leaving the bag at room temperature for 1 day, the adhesive strength was measured to be 85 g.
The bag had good f / 25 mm and re-adhesive strength of 23 gf / 25 mm, and was a resealing bag. Moreover, the rice cracker was kept in a good state when the rice cracker was put in the bag and left at room temperature for one month.

[0024]

Industrial Applicability As described above, the packaging bag of the present invention can be manufactured very simply without any special device or equipment and can be applied to any shape. Therefore, not only food products but also industrial products, pharmaceuticals,
It is suitable as a packaging bag that can store and seal contents such as sundries that need to be opened and closed each time it is used.

[Brief description of drawings]

FIG. 1 is a view of a packaging bag of the present invention in which an adhesive layer is formed transversely to the bag.

FIG. 2 is a view of a packaging bag of the present invention formed by cutting an adhesive layer into a heat-sealed portion.

FIG. 3 is a view of a packaging bag in which the pressure-sensitive adhesive layer is formed in a mountain shape according to the present invention.

FIG. 4 is a view of a packaging bag in which the adhesive layer of the present invention is formed in an arc shape.

FIG. 5 is a diagram of a pillow packaging bag of the present invention.

FIG. 6 is a diagram of a packaging bag of the present invention in which an adhesive layer is formed in a wavy line.

FIG. 7 is a partially cutaway perspective view of the packaging bag of FIG. 1 in which the upper heat-sealed portion is cut and opened.

FIG. 8 is a view of a packaging bag of the present invention in which an adhesive layer is formed on the outer surface layer of the bag.

FIG. 9 is a diagram showing a laminated structure of an adhesive layer and a base material of a bag.

FIG. 10 is a diagram showing a laminated structure of an adhesive layer and a base material of a bag.

FIG. 11 is a diagram showing a laminated structure of an adhesive layer and a base material of a bag.

FIG. 12 is a view of a packaging bag of the present invention in which a heat seal portion is formed in addition to the adhesive layer.

FIG. 13 is a view of a packaging bag of the present invention in which an adhesive layer is formed on the entire inner surface layer of the bag.

FIG. 14 is a partial perspective view of the packaging bag of FIG. 13 with an upper portion of the adhesive layer opened.

[Explanation of symbols]

1 packaging bag 2 Heat seal part 3 Adhesive layer 4 notches 5 Cut when cut with notch Inside of 6 bags 11 plastic film 12 Other simple substance

Claims (7)

[Claims] 1. A packaging bag in which a pressure-sensitive adhesive layer is directly formed on at least a part of the surface layer of the bag, wherein the pressure-sensitive adhesive layer is heated, or pressure is applied after heating, or at the same time, the pressure-sensitive adhesive force is applied. A packaging bag, which is a layer obtained by heating an adhesive that develops. 2. A part of the surface layer on which the adhesive layer is formed,
The packaging bag according to claim 1, which is a plastic layer. 3. The packaging bag according to claim 1, wherein the surface layer is an inner surface layer of the bag. 4. The packaging bag according to claim 3, wherein the bag is a bag sealed by heat sealing. 5. The packaging bag according to claim 3, wherein the adhesive layer is formed on at least the entire inner surface layer on one side of the bag. 6. The packaging bag according to claim 4, further comprising:
A packaging bag provided with a heat-sealing portion adjacent to the adhesive layer. 7. At least a part of the surface layer of the base material of the bag,
After applying the pressure-sensitive adhesive that directly or directly after heating, or pressurizing after heating, or heating and pressurizing at the same time,
Characterized in that the pressure-sensitive adhesive is heated at the time of bag making or after bag making, or pressure is applied after heating, or heating / pressurization is performed simultaneously.
A method of manufacturing a packaging bag that can be repeatedly opened and closed.