JP2020175957A - Method of manufacturing packaging bag, and packaging bag - Google Patents

Abstract

To provide a method of manufacturing a packaging bag less apt to lose a perfume component and water content from a packed object.SOLUTION: A method of manufacturing a packaging bag whose film laminated in order with an A-layer 4, a B-layer 6 and a C-layer 10 is made in a bag form, includes a process of fusing a raw material making up the B-layer 6 between the A-layer 4 and the C-layer 10, in which (1) the A-layer 4 is a biaxial-orientation polypropylene layer or a polyethylene terephthalate layer, the B-layer 6 is a polyvinylidene chloride layer and the C-layer 10 is a cast polypropylene layer or a linear low-density polyethylene layer, or (2) the A-layer 4 is a polyvinylidene chloride layer, the B-layer 6 is a biaxial-orientation polypropylene layer or a polyethylene terephthalate layer and the C-layer 10 is a cast polypropylene layer or a linear low-density polyethylene layer.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing a packaging bag and a packaging bag.

In recent years, paper towels that have been scented by using a perfume liquid in the paper towel manufacturing process have been manufactured (see, for example, Patent Document 1). Further, this paper towel is individually packaged by being scented, cut into a predetermined size, and wrapped with a wrapping film. As the wrapping bag for this paper towel, a wrapping bag made of a film made of polypropylene is used.

JP-A-2017-42389

However, when a packaging bag made of a polypropylene film is used, the fragrance component is removed from the paper towel scented through the film, so that it is not suitable for long-term storage. In addition, when storing paper towels for a long period of time, it is necessary to store the paper towels in a state where they are sufficiently moist.
An object of the present invention is to provide a method for producing a packaging bag and a packaging bag in which fragrance components and water are not easily released from the object to be packaged.

As a result of diligent studies in view of the above problems, the present inventors have found that the above object can be achieved by a packaging bag formed of a film containing three layers of a predetermined type, and complete the present invention. It came to.

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 formed into a bag shape, and a raw material constituting the B layer is melted between the A layer and the C layer. Including the steps, (1) the A layer is a biaxially stretched 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 producing a packaging bag, wherein the A layer is a polyvinylidene chloride layer, the B layer is a biaxially stretched 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 in which a film in which A layer, B layer and C layer are laminated in order is formed into a bag shape. (1) The A layer is a biaxially stretched polypropylene layer or a polyethylene terephthalate layer, and the B layer is a poly. The vinylidene chloride layer, the C layer is a cast polypropylene layer or a linear low density polyethylene layer, or (2) the A layer is a polyvinylidene chloride layer, the B layer is a biaxially stretched polypropylene layer or a polyethylene terephthalate layer, and the C layer. Is a packaging bag which is a cast polypropylene layer or a linear low density polyethylene layer and does not contain an adhesive layer between the A layer, the B layer and the C layer, respectively.
(3) A method for manufacturing a packaging bag for manufacturing the packaging bag according to (2), which comprises a step of using a direct laminating method is provided.

According to the packaging bag of the present invention, it is possible to provide a method for producing a packaging bag and a packaging bag in which fragrance components and water are not easily released from the object to be packaged.

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

Hereinafter, the packaging bag of the present invention will be described. The packaging bag of the present invention is cast onto a laminate of a biaxially stretched polypropylene (OPP) layer and a polyvinylidene chloride (PVDC) layer or a laminate of a polyethylene terephthalate (PET) layer and a polyvinylidene chloride (PVDC) layer. It is a bag-shaped film in which a polypropylene (CPP) layer or a linear low density polyethylene (L-LDPE) layer is laminated.

FIG. 1 is a schematic view showing the structure of a film. As shown in FIG. 1, the film 2 used in the present invention may be a laminated body 8 having an A layer 4 and a B layer 6 and a cast polypropylene layer or a linear low density polyethylene layer 10 (hereinafter, referred to as “C layer 10”). .)have.

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

Further, in the laminated body 8, when the A layer 4 is a polyvinylidene chloride layer, the B layer 6 is a biaxially stretched polypropylene layer or a polyethylene terephthalate layer, and when the B layer 6 is a polyvinylidene chloride layer, A Layer 4 is a biaxially stretched 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 a stretched 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 water are less likely to escape from the packaged object and long-term storage is 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, and the laminate 8 is a polyethylene terephthalate layer and a polyvinylidene chloride layer. It is more preferable that the thickness of the laminated body is 10 μm or more and 80 μm or less.

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

Further, the water vapor permeability of the film used in the present invention is preferably 4. from the viewpoint that when the film 2 is used as a packaging bag, it becomes difficult for the fragrance component and water to escape from the packaged object, and long-term storage becomes possible. 0g ^/ (m 2 · day) or less, more preferably 3.6g / (m2 · day) or less. The water vapor permeability is a value measured based on JIS K7129-5: 2016 under the conditions of 40 ° C. and 90% relative humidity.
When the film 2 is used as a packaging bag, it becomes difficult for the fragrance component and water to escape from the packaged object, so that the film 2 can be stored for 3 months or more under the storage condition of 40 ° C.

The method for producing the film used in the present invention is not particularly limited, but a method of laminating the laminated body 8 and the C layer 10 is preferable, and a known method such as a dry laminating method, an extruded laminating method, or a direct laminating method can be adopted. it can. Among these, the direct laminating method is preferable from the viewpoint that an adhesive layer is not required between the laminated body 8 and the C layer 10. The laminated body 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.
Further, in the present invention, the OPP layer is mainly composed of biaxially stretched polypropylene, the PET layer is mainly composed of polyethylene terephthalate, the PVDC layer is mainly composed of polyvinylidene chloride, the CPP layer is mainly composed of cast polypropylene, and the L-LDPE layer is mainly composed of linear low density polyethylene. Any layer may be used as a component, and each layer may contain other components as long as the object of the present invention is not impaired.

Even if the method is other than the method of laminating the laminated body 8 and the C layer 10 to obtain the film 2, any method can be adopted as long as the A layer, the B layer and the C layer can be laminated. 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 a 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 an extrusion laminating method. You may get it.
Further, 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.

Further, layers made of various materials such as a layer made of Japanese paper and a layer made of an aluminum material may be laminated on the front surface and the back surface 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 a layer composed of various materials. Further, the surface may be matted or the like.

The packaging bag of the present invention can be 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 can be cut into a predetermined shape such as a rectangle and formed into a tubular shape, and the peripheral portions of the overlapping films can be heat-sealed to form a bag shape.
The mode of the heat seal is not particularly limited, and side seals, stick-type seals, three-way seals, four-sided seals, envelope sticker seals, pillow seals, gussets, and the like can be used.

Further, the method of sealing and packaging the object to be packaged by the packaging bag of the present invention is not particularly limited, but a cylinder is formed by heat-sealing the film 2 cut into a predetermined shape while leaving an opening for loading. A method of forming a shape or a bag shape, inserting an object to be packaged through the opening, and finally heat-sealing the opening; Examples thereof include a method of heat-sealing the peripheral edge of the object to be packaged in the film 2. Thereby, the individual package of the object to be packaged can be obtained.

The packaged object to be sealed and packaged by the packaging bag of the present invention is not particularly limited, but an aroma product containing a fragrance component or a product containing a sufficient amount of water is preferable, and for example, an aroma sheet or a hand towel (particularly containing a fragrance component) Oshibori) and the like. The material of the hand towel is not particularly limited, and known hand towels such as paper hand towels, non-woven hand towels and cloth hand towels can be sealed and packaged. Further, from the viewpoint of adhesiveness, it is preferable to seal and package the object to be packaged so that the C layer 10 side of the film 2 is on the inside (the object to be packaged).

The fragrance component is not particularly limited, and examples thereof include fragrance components having scents such as citrus, peppermint, lavender, black moji, sardine, hinoki, sugi, and fir, and aroma oils having these scents and the like. Can be used.

According to the packaging bag of the present invention, it becomes difficult for the fragrance component and water to escape from the packaged object, and long-term storage is possible. Further, since the film used in the present invention is excellent in processability, it can be manufactured in a state where the line speed is increased when the film to be packaged is used as a packaging bag.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto. Unless otherwise specified, parts and% in this embodiment are based on weight.

In the examples and comparative examples, the water vapor permeability of the film was measured, the moisture retention test and the aroma retention test were performed. In addition, the evaluation was performed using the 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, and the thickness of the laminate is 20 μm and the thickness of the CPP layer is 30 μm is used. There was. The 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. Further, in the case of heat-sealing in the following, the CPP layer was placed inside (wet towel side) and heat-sealed 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, and the thickness of the laminate is 12 μm and the thickness of the CPP layer is 30 μm is used. There was. The 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. Further, in the case of heat-sealing in the following, the CPP layer was placed inside (wet towel side) and heat-sealed to form a packaging bag.

(Comparative Example 1)
As the film C of Comparative Example 1, a film in which 9 g of Japanese paper was laminated on an OPP layer having a thickness of 25 μm was used. In the case of heat-sealing in the following case, the OPP layer was placed on the inside (wet towel side) and heat-sealed to form a packaging bag.

(Comparative Example 2)
As the film D of Comparative Example 2, a film in which an OPP layer having a thickness of 20 μm and a CPP layer having a thickness of 20 μm were laminated was used. In the case of heat sealing in the following, the CPP layer was placed inside (wet towel side) and heat sealing was performed to form a packaging bag.
In addition, the measurement of water vapor permeability of the film, the moisture retention test and the fragrance retention test were carried out as follows.

(Measurement of water vapor permeability)
The water vapor permeability of the films A to D was measured based on JIS K7129-5: 2016 under the conditions of 40 ° C. and 90% relative humidity. The results are shown in Table 2.

(Moisturizing test)
Non-woven fabric towels (size: 255 mm × 270 mm) were sealed and packaged in a packaging bag by heat-sealing each of the films A to D, and each was heated and stored in a dryer at 40 ° C. The weight before storage and the weight after storage were measured, and the dehumidification rate was determined from the amount of weight loss. The results are shown in Table 2. The smaller the dehumidification rate value, the higher the moisturizing property of the packaging bag.

In addition, the estimated expiration date of the hand towel sealed and packaged in the packaging bag using the films A to D was calculated from the dehumidification rate. Here, from the evaluation of the water content and the feeling of use of the hand towel as shown in Table 1, it is judged that the feeling of use is inferior and the hand towel is dry when the water content is less than 100%. The results shown in Table 1 are based on the evaluation of the feeling of use by touch using a non-woven hand towel having a size of 255 mm × 270 mm and a dry weight of 3.0 g as the water content (moisture content) shown in Table 1, and the following evaluation criteria. It is the result of evaluation by.
<Evaluation criteria>
○: The hand towel is sufficiently moist △: The hand towel is slightly dry ×: The hand 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。

The period during which the water content of the hand towel was 100% was calculated at the above dehumidification rate, and this was determined as the estimated expiration date of the hand towel at 40 ° C. The results are shown in Table 2.

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

(Aroma retention test)
Non-woven hand towels (size: 255 mm x 270 mm) perfused by heat-sealing the films A to D are sealed and packaged in a packaging bag, and each is placed in a sealed container under the conditions of 23 ° C. and 50% relative humidity. 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 confirmed and evaluated according to the following evaluation criteria. The results are shown in Table 2. The less odor there is, the higher the aroma retention of the packaging bag.
<Evaluation criteria>
A: Does not smell B: Slightly smells C: Strongly smells

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 further, film A (Example 2) The packaging bag using Example 1) and film B (Example 2) is superior in moisturizing and fragrance-retaining properties to the packaging bag 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 (3)

This is a method for manufacturing a packaging bag in which a film in which layers A, B, and C are laminated in order is formed into a bag.
A step of melting the raw material constituting the B layer between the A layer and the C layer is included.
(1) The A layer is a biaxially stretched 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, wherein the polyvinylidene chloride layer, the B layer is a biaxially stretched polypropylene layer or a polyethylene terephthalate layer, and the C layer is a cast polypropylene layer or a linear low density polyethylene layer. A packaging bag in which a film in which layers A, B, and C are laminated in order is formed into a bag.
(1) The A layer is a biaxially stretched 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 The polyvinylidene chloride layer, the B layer is a biaxially stretched polypropylene layer or a polyethylene terephthalate layer, and the C layer is a cast polypropylene layer or a linear low density polyethylene layer.
A packaging bag that does not contain an adhesive layer between the A layer, the B layer, and the C layer. A method for producing a packaging bag according to claim 2, wherein the method for producing a packaging bag includes a step of using a direct laminating method.

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