JP7136847B2 - Packaging bag manufacturing method and packaging bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of manufacturing a packaging bag and a packaging bag.

BACKGROUND ART In recent years, wet paper towels that are scented by using a perfume liquid in the manufacturing process of wet paper towels have been manufactured (see, for example, Patent Document 1). After the wet paper towel is scented, it is cut into a predetermined size and individually packaged by being wrapped in a wrapping film. A packaging bag made of polypropylene film is used as the packaging bag for the wet paper towel.

JP 2017-42389 A

However, when a packaging bag made of a polypropylene film is used, it is not suitable for long-term storage because the fragrance component escapes from the scented wet paper towel through the film. In addition, when storing wet paper towels for a long period of time, it is necessary to store the wet towels in a state in which they are sufficiently moist.
SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a packaging bag and a packaging bag in which perfume ingredients and moisture are less likely to escape from the packaged items.

As a result of intensive studies in view of the above problems, the inventors of the present invention have found that the above object can be achieved by a packaging bag formed of a film comprising three layers of predetermined types, and have completed the present invention. reached.

That is, according to the present invention,
(1) A method for producing a packaging bag in which a film in which A layer, B layer and C layer are laminated in order is melted between the A layer and the C layer. (1) the A layer is a biaxially oriented polypropylene layer or a polyethylene terephthalate layer, the B layer is a polyvinylidene chloride layer, and the C layer is a cast polypropylene layer or a linear low density polyethylene layer; or (2) A method for manufacturing a packaging bag, wherein the A layer is a polyvinylidene chloride layer, the B layer is a biaxially oriented polypropylene layer or a polyethylene terephthalate layer, and the C layer is a cast polypropylene layer or a linear low density polyethylene layer,
(2) A packaging bag made of a film in which layers A, B and C are laminated in order, wherein (1) the A layer is a biaxially oriented polypropylene layer or a polyethylene terephthalate layer, and the B layer is a poly A vinylidene chloride layer, the C layer being a cast polypropylene layer or a linear low density polyethylene layer, or (2) the A layer being a polyvinylidene chloride layer, the B layer being a biaxially oriented polypropylene layer or a polyethylene terephthalate layer, the C layer is a cast polypropylene layer or a linear low density polyethylene layer, and a packaging bag that does not contain an adhesive layer between the A layer, the B layer, and the C layer, respectively;
(3) There is provided a packaging bag manufacturing method for manufacturing the packaging bag described in (2), which method includes a step of using a direct lamination method.

According to the packaging bag of the present invention, it is possible to provide a method for manufacturing a packaging bag and a packaging bag in which the fragrance component and moisture are less likely to escape from the package.

It is a schematic diagram which shows the laminated structure of the film used for this invention.

The packaging bag of the present invention will be described below. The packaging bag of the present invention is a laminate of a biaxially oriented polypropylene (OPP) layer and a polyvinylidene chloride (PVDC) layer or a laminate of a polyethylene terephthalate (PET) layer and a polyvinylidene chloride (PVDC) layer. A film in which polypropylene (CPP) layers or linear low density polyethylene (L-LDPE) layers are laminated is made into a bag shape.

FIG. 1 is a schematic diagram showing the configuration of the film. As shown in FIG. 1, the film 2 used in the present invention includes a laminate 8 having an A layer 4 and a B layer 6, and a cast polypropylene layer or linear low density polyethylene layer 10 (hereinafter sometimes referred to as "C layer 10"). .)have.

Here, the laminate 8 is a KOP film with a biaxially oriented polypropylene layer and a polyvinylidene chloride layer or a KET film with a polyethylene terephthalate layer and a polyvinylidene chloride layer.

Further, when the A layer 4 in the laminate 8 is a polyvinylidene chloride layer, the B layer 6 is a biaxially oriented polypropylene layer or a polyethylene terephthalate layer, and the B layer 6 is a polyvinylidene chloride layer, the A Layer 4 is a biaxially oriented polypropylene layer or a polyethylene terephthalate layer. Among these, it is preferable that the A layer 4 is a polyvinylidene chloride layer and the B layer 6 is an oriented polypropylene layer or a polyethylene terephthalate layer.

The thickness of the laminate 8 is preferably 5 μm or more, more preferably 10 μm or more, from the viewpoint that when the film 2 is used as a packaging bag, the fragrance component and moisture are less likely to escape from the packaged item and long-term storage becomes possible. Yes, preferably 80 μm or less. Further, when the laminate 8 is a laminate of a biaxially stretched polypropylene layer and a polyvinylidene chloride layer, the thickness is more preferably 15 μm or more and 80 μm or less. It is more preferable that the thickness in the case of a laminate with is 10 μm or more and 80 μm or less.

In addition, when the film 2 is used as a packaging bag, the thickness of the C layer 10 is preferably 10 μm or more, more preferably 15 μm, from the viewpoint that it is difficult for the fragrance component and water to escape from the package and long-term storage is possible. Above, more preferably 20 μm or more, preferably 80 μm or less.

In addition, the water vapor transmission rate of the film used in the present invention is preferably 4.0 from the viewpoint that when the film 2 is used as a packaging bag, it is difficult for the fragrance component and water to escape from the packaged object, and long-term storage becomes possible. It is 0 g/(m ² ·day) or less, more preferably 3.6 g/(m 2 ·day) or less. The water vapor permeability is a value measured under conditions of 40° C. and relative humidity of 90% based on JISK7129-5:2016.
In addition, when the film 2 is used as a packaging bag, it becomes possible to store for 3 months or more under storage conditions of 40° C. because it becomes difficult for the fragrance component and water to escape from the packaged item.

The method for producing the film used in the present invention is not particularly limited, but a method of laminating the laminate 8 and the C layer 10 is preferable, and a known method such as a dry lamination method, an extrusion lamination method, a direct lamination method, etc. can be employed. can. Among these methods, the direct lamination method is preferable from the viewpoint of not requiring an adhesive layer between the laminate 8 and the C layer 10 . The laminate 8 may be obtained by laminating an OPP layer or a PET layer and a PVDC layer by a known method, or a commercially available KOP film or KET film may be used.
In the present invention, the OPP layer is mainly made of biaxially oriented polypropylene, the PET layer is made of polyethylene terephthalate, the PVDC layer is made of polyvinylidene chloride, the CPP layer is made of cast polypropylene, and the L-LDPE layer is made of linear low-density polyethylene. Any layer may be used as long as it is a component layer, and each layer may contain other components as long as the object of the present invention is not impaired.

Note that any method other than the method of obtaining the film 2 by laminating the laminate 8 and the C layer 10 may be employed without limitation as long as the method is capable of laminating the A layer, the B layer and the C layer. can be done. For example, a film constituting the A layer 4 and a cast polypropylene film constituting the C layer 10 are prepared in advance, and the raw material constituting the B layer 6 is melted between the A layer 4 and the C layer 10 to form the film 2 by extrusion lamination. You may get
Moreover, an adhesive layer may be provided between the A layer 4 and the B layer 6 and between the B layer 6 and the C layer 10 as long as the effect of the present invention is not impaired.

Layers made of various materials, such as a layer made of Japanese paper and a layer made of aluminum, may be laminated on the front and back surfaces of the film 2 as long as the effects of the present invention are not impaired. Further, printing such as package printing may be performed on the A layer 4, the B layer 6, the C layer 10, or layers composed of various materials. Moreover, matting or the like may be performed on the surface.

The packaging bag of the present invention is obtained by forming the above film 2 into a bag shape. As a method of forming the film into a bag shape, the film 2 is cut into a predetermined shape such as a rectangle, and formed into a cylindrical shape or the like, and the peripheral edges of the overlapping films are heat-sealed to form a bag shape.
Moreover, the mode of heat sealing is not particularly limited, and a side seal, a stick seal, a three-side seal, a four-side seal, an envelope pasting seal, a pillow seal, a gusset, or the like can be used.

In addition, although there are no particular limitations on the method of sealingly packaging an object to be packaged with the packaging bag of the present invention, the film 2 cut into a predetermined shape leaving an opening for introduction is heat-sealed to form a cylinder. A method in which the package is formed into a shape or a bag shape, the item to be packaged is put through the opening, and finally the opening is heat-sealed; A method of heat-sealing the periphery of the object to be packaged in the film 2 can be used. As a result, an individual package of the object to be packaged can be obtained.

In addition, the items to be sealed and packaged by the packaging bag of the present invention are not particularly limited, but fragrant products containing fragrant components and products containing sufficient moisture are preferable. towels) and the like. The material of the wet towel is not particularly limited, and known wet towels such as paper wet towels, non-woven fabric wet towels, and cloth wet towels can be hermetically packaged. From the viewpoint of adhesiveness, it is preferable to hermetically package the object to be packaged so that the C layer 10 side of the film 2 is on the inside (the side of the object to be packaged).

The fragrance component is not particularly limited, but includes, for example, fragrance components having fragrances such as citrus, peppermint, lavender, kuromoji, magnolia, cypress, cedar, and fir. can be used.

According to the packaging bag of the present invention, it becomes difficult for the fragrance component and moisture to escape from the packaged item, and long-term storage can be made possible. In addition, since the film used in the present invention is excellent in workability, it can be manufactured at an increased line speed when forming a packaging bag for packaging an object to be packaged.

EXAMPLES The present invention will be described below with reference to Examples, but the present invention is not limited to these. Parts and percentages in the examples are by weight unless otherwise specified.

In Examples and Comparative Examples, the water vapor transmission rate of the film was measured, the moisture retention test and the fragrance retention test were carried out. In addition, evaluation was performed using films A to D described in Examples and Comparative Examples below.

(Example 1)
As the film A of Example 1, a film in which a CPP layer is laminated on a laminate having an OPP layer and a PVDC layer, the thickness of the laminate is 20 μm and the thickness of the CPP layer is 30 μm. board. Film A is a film in which the A layer in FIG. 1 is a PVDC layer, the B layer is an OPP layer, and the C layer is a CPP layer. In addition, when heat-sealing in the following, heat-sealing was performed with the CPP layer on the inside (hand towel side) to form a packaging bag.

(Example 2)
As the film B of Example 2, a film in which a CPP layer is laminated on a laminate having a PET layer and a PVDC layer, the thickness of the laminate is 12 μm and the thickness of the CPP layer is 30 μm. board. Film B is a film in which the A layer in FIG. 1 is a PVDC layer, the B layer is a PET layer, and the C layer is a CPP layer. In addition, when heat-sealing in the following, heat-sealing was performed with the CPP layer on the inside (hand towel side) to form a packaging bag.

(Comparative example 1)
As Film C of Comparative Example 1, an OPP layer having a thickness of 25 μm and 9 g of Japanese paper laminated thereon was used. When heat-sealing in the following, the heat-sealing was performed with the OPP layer on the inside (on the hand towel side) to form a packaging bag.

(Comparative example 2)
As Film D of Comparative Example 2, a film obtained by laminating an OPP layer with a thickness of 20 μm and a CPP layer with a thickness of 20 μm was used. When heat-sealing in the following, heat-sealing was performed with the CPP layer on the inside (on the hand towel side) to form a packaging bag.
In addition, measurement of the water vapor transmission rate of the film, moisture retention test and fragrance retention test were carried out as follows.

(Measurement of water vapor permeability)
Films A to D were measured for water vapor permeability under conditions of 40° C. and relative humidity of 90% based on JISK7129-5:2016. Table 2 shows the results.

(Moisture retention test)
Non-woven towels (size: 255 mm×270 mm) were hermetically packaged in a packaging bag by heat-sealing each of the films A to D, and each of them was heated and stored at 40° C. in a dryer. The weight before storage and the weight after storage were measured, and the dehumidification rate was determined from the amount of weight loss. Table 2 shows the results. A smaller dehumidification rate indicates a higher moisture retention of the packaging bag.

Also, from the dehumidification rate, the estimated expiration date of the hand towel sealed in the packaging bag using the films A to D was calculated. Here, as shown in Table 1, from the evaluation of the water content of the hand towel and the feeling of use, when the water content is less than 100%, the feeling of use is poor and it is judged to be dry. In addition, the results shown in Table 1 were obtained by evaluating the feeling of use based on the feel of a wet towel made of nonwoven fabric having a size of 255 mm x 270 mm and a dry weight of 3.0 g assuming the water content (moisture content) shown in Table 1, and using the following evaluation criteria. This is the result of evaluation by
<Evaluation Criteria>
○: The wet towel is sufficiently moist △: The wet towel is slightly dry ×: The wet towel is dry

上記の脱湿速度でおしぼりの含水率が１００％となる期間を算出し、これを４０℃におけるおしぼりの推定使用期限として求めた。結果を表２に示す。

At the above dehumidification rate, the period during which the moisture content of the hand towel reaches 100% was calculated, and this was obtained as the estimated expiration date of the hand towel at 40°C. Table 2 shows the results.

As shown in Table 2, the estimated expiration date of the wet towel when the packaging bag made of film A or B is used is 3 to 5 months, and the wet towel when the packaging bag made of film C or D is used. It was found that it is possible to store for a longer period than the estimated expiration date of 1 to 2 months.

(Fragrance retention test)
Non-woven hand towels (size: 255 mm × 270 mm) scented by heat-sealing each of the films A to D are sealed in a packaging bag, each is placed in a sealed container, and the conditions are 23 ° C. and a relative humidity of 50%. stored in After 1 day, 2 days, 6 days and 17 days from the start of storage, the presence or absence of odor in the sealed container was checked and evaluated according to the following evaluation criteria. Table 2 shows the results. The less odor, the higher the aroma retaining property of the packaging bag.
<Evaluation Criteria>
A: No smell B: Slight smell C: Strong smell

From the results shown in Table 2, Film A (Example 1) and Film B (Example 2) have lower water vapor permeability than Film C (Comparative Example 1) and Film D (Comparative Example 2), and Film A ( Packaging bags using Example 1) and Film B (Example 2) are superior in moisture retention and fragrance retention to packaging bags using Film C (Comparative Example 1) and Film D (Comparative Example 2). I found out.

2... Film, 4... A layer, 6... B layer, 8... Laminate, 10... C layer

Claims (2)

A method for manufacturing a packaging bag in which a film in which A layer, B layer and C layer are laminated in order is formed into a bag shape,
A step of melting a raw material constituting the B layer between the A layer and the C layer,
(1) The A layer is a biaxially oriented polypropylene layer or a polyethylene terephthalate layer, the B layer is a polyvinylidene chloride layer, the C layer is a cast polypropylene layer or a linear low density polyethylene layer, or (2) the A layer is A method for producing a packaging bag comprising a polyvinylidene chloride layer, the B layer being a biaxially oriented polypropylene layer or a polyethylene terephthalate layer, and the C layer being a cast polypropylene layer or a linear low density polyethylene layer. A packaging bag obtained by the manufacturing method according to claim 1, wherein the water vapor permeability of the film is 4.0 g/(m ² day) a packaging bag that is:

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