JP2022135155A - Fitting tool and bag with fitting tool - Google Patents

Abstract

To provide a fitting bag that can reduce the amount of used synthetic resin in a bag with the fitting tool, but has rigidity and toughness usable as the fitting tool, and to provide the bag with the fitting tool.SOLUTION: A fitting tool 10 has: a first fitting member 12 having a first fitting part 18 provided on a mating face of a band-like first substrate 16 along a longitudinal direction; and a second fitting member 14 having a second fitting part 22 provided on a mating face of a band-like second substrate 20 along the longitudinal direction. The first substrate 16, the first fitting part 18, the second substrate 20 and the second fitting part 22 are made of a resin composition containing cellulose powder and thermoplastic resin. The proportion of the cellulose powder to the total mass of the resin composition is more than 50 mass%. The cellulose powder has an average particle size of 20 μm or less. The thermoplastic resin comprises an ethylene-vinyl acetate copolymer and a maleic anhydride-modified polyolefin.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a fitting and a bag body with the fitting.

2. Description of the Related Art In various fields such as food, medicine, and miscellaneous goods, a bag body with a fitting attached to the inner surface near the opening of the bag body with a fitting for freely opening and closing the opening is widely used as a packaging material. . As the fitting tool, a first fitting portion and a second fitting portion that are detachably fitted to each other are provided on the opposing surfaces of a pair of strip-shaped base materials along the longitudinal direction of the base materials. The following are listed.

Thermoplastic resin is generally used as the material of the bag body.
The material of the fitting has a moldability that allows molding of the first fitting portion and the second fitting portion, a suitable rigidity for detachably fitting the first fitting portion and the second fitting portion, and Toughness is required. From such a point of view, polypropylene resin is generally used as the material for fittings.

In recent years, the waste of synthetic resin products has been viewed as a problem, including the problem of marine plastics. Therefore, there is an increasing demand year by year to reduce the amount of synthetic resin used in synthetic resin products, especially packaging materials that are discarded immediately after use, by switching at least a portion of the raw materials to non-synthetic resin raw materials.
As a raw material other than the synthetic resin, for example, a cellulose material such as paper is used.

Patent Document 1 proposes a medicinal patch packaging bag in which a resealable means such as a zipper tape is provided in a package formed by heat-sealing a laminate having a specific layer structure including a base material layer. ing. It has also been proposed to use paper for the base material layer.
However, even if paper is used for the base material layer, the rate of reduction in the amount of synthetic resin used in the packaging bag of Patent Document 1 is not so large.
Note that Patent Document 1 does not particularly consider the material of the zipper tape.

JP 2016-074484 A

The present invention provides fittings that can reduce the amount of synthetic resin used in a bag body with fittings, yet has rigidity and toughness that can be used as fittings, and a bag body with fittings using the fittings. intended to provide

The present invention has the following aspects.
[1] A pair of strip-shaped first fitting member and second fitting member,
The first fitting member includes a strip-shaped first base material and a first fitting portion provided along the longitudinal direction on the facing surface of the first base material,
The second fitting member is provided along the longitudinal direction on the facing surface of the second base material and the second base material, and is detachably fitted to the first fitting part. A fitting comprising:
The first substrate, the first fitting portion, the second substrate and the second fitting portion are made of a resin composition containing cellulose powder and a thermoplastic resin,
The ratio of the cellulose powder to the total mass of the resin composition is more than 50% by mass,
The average particle size of the cellulose powder is 20 μm or less,
A fitting, wherein the thermoplastic resin contains an ethylene-vinyl acetate copolymer and a maleic anhydride-modified polyolefin.
[2] The fitting according to [1] above, wherein the ratio of the cellulose powder to the total mass of the fitting is more than 50% by mass.
[3] The ratio of the cellulose powder to the total weight of the resin composition is more than 50% by mass and 85% by mass or less, the ratio of the ethylene-vinyl acetate copolymer is 10% by mass or more and less than 45% by mass, and the maleic anhydride. The fitting according to the above [1] or [2], wherein the ratio of modified polyolefin is 5% by mass or more and less than 15% by mass.
[4] The fitting according to any one of [1] to [3], wherein the thermoplastic resin further contains a thermoplastic olefin elastomer.
[5] The ratio of the cellulose powder to the total weight of the resin composition is more than 50% by mass and 75% by mass or less, the ratio of the ethylene-vinyl acetate copolymer is 10% by mass or more and less than 35% by mass, and the maleic anhydride. The fitting according to [4] above, wherein the proportion of the modified polyolefin is 5% by mass or more and less than 15% by mass, and the proportion of the thermoplastic olefin elastomer is 10% by mass or more and less than 28% by mass.
[6] The fitting according to any one of [1] to [5], wherein the resin composition has a maximum draw ratio of 270% or more.
[7] The fitting according to any one of [1] to [6], wherein the resin composition has a flexural modulus of 110 to 270 MPa.
[8] The first fitting member includes a first sealing layer laminated on the outer surface side of the first base material,
The fitting according to any one of [1] to [7] above, wherein the second fitting member includes a second sealing layer laminated on the outer surface side of the second base material.
[9] A bag with fittings, comprising a bag body for containing contents, and the fittings according to any one of [1] to [8] attached to the inner surface of the bag body.

ADVANTAGE OF THE INVENTION According to the present invention, fittings that can reduce the amount of synthetic resin used in a bag body with fittings and yet have rigidity and toughness that can be used as fittings, and a bag with fittings using the fittings I can provide my body.

It is a schematic sectional drawing which shows an example of the fitting tool of this invention. It is a schematic sectional drawing which shows the other example of the fitting tool of this invention. It is a schematic front view which shows an example of the bag body with a fitting of this invention. FIG. 4 is a schematic perspective view showing a state in which the bag with fittings of FIG. 3 is opened;

[Fitting tool]
A fitting tool of the present invention includes a pair of strip-shaped first fitting member and second fitting member. The first fitting member includes a strip-shaped first base material and a first fitting portion provided along the longitudinal direction on the facing surface of the first base material. The second fitting member includes a strip-shaped second base material, a second fitting part provided along the longitudinal direction on the opposing surface of the second base material, and detachably fitted with the second fitting part; Prepare.
The first base material, the first fitting part, the second base material and the second fitting part are made of a resin composition containing cellulose powder and a thermoplastic resin (hereinafter also referred to as "resin composition (X)"). consists of The ratio of cellulose powder to the total mass of resin composition (X) is more than 50% by mass. Thermoplastic resins include ethylene-vinyl acetate copolymers and maleic anhydride-modified polyolefins.
The fitting of the present invention is attached to the inner surface of the bag body containing the contents. By attaching the fitting of the present invention to the inner surface of the bag body along the opening formed in the bag body, the opening can be freely opened and closed.

An example of the fitting tool of the present invention will be described below with reference to the drawings. It should be noted that the dimensions and the like of the drawings illustrated in the following description are only examples, and the present invention is not necessarily limited to them, and can be implemented with appropriate changes within the scope of not changing the gist of the present invention. .

As shown in FIG. 1, the fitting 10 of this embodiment includes a pair of band-shaped first fitting member 12 and second fitting member 14 .
The first fitting member 12 includes a strip-shaped first base material 16 and a first fitting part consisting of a male side fitting part of a ridge provided along the longitudinal direction on the facing surface 16a of the first base material 16. 18. The first base material 16 and the first fitting portion 18 are integrally molded.
The second fitting member 14 is provided along the longitudinal direction on the belt-shaped second base material 20 and the facing surface 20a of the second base material 20, and is a female side that is detachably fitted to the first fitting part 18. and a second fitting portion 22 formed of a fitting portion. The second base material 20 and the second fitting portion 22 are integrally molded.

When the fitting 10 is attached to the bag body, the first side edge 16b of the first base material 16 and the first side edge 20b of the second base material 20 are located on the side of the opening formed in the bag body. The second side edge 16c of the first base material 16 and the second side edge 20c of the second base material 20 are attached so as to face the content side of the bag body.

The first fitting portion 18 is provided on the facing surface 16 a of the first base material 16 along the longitudinal direction of the first base material 16 . The first fitting portion 18 includes a trunk 18a rising from the facing surface 16a of the first base material 16, and a head 18b provided at the tip of the trunk 18a and having a substantially semicircular cross section larger than the trunk 18a.

The second fitting portion 22 is provided on the facing surface 20 a of the second base material 20 along the longitudinal direction of the second base material 20 . The second base member 20 is composed of a first arm portion 22a and a second arm portion 22b that rise from the facing surface 20a of the second base member 20 in an arcuate cross-section. is formed.

The first fitting portion 18 and the second fitting portion 22 can be detachably fitted together by fitting the head portion 18b of the first fitting portion 18 into the concave portion 22c of the second fitting portion 22. ing.
The cross-sectional shapes of the first fitting portion 18 and the second fitting portion 22 are such that the opening of the bag body can be repeatedly opened and closed by attaching and detaching the first fitting portion 18 and the second fitting portion 22 to each other. Any known cross-sectional shape can be adopted.

The thickness of the first base material 16 is preferably 0.1-0.4 mm, more preferably 0.12-0.3 mm. If the thickness of the first base material 16 is equal to or greater than the lower limit, sufficient sealing strength can be obtained when the fitting 10 is thermally welded to the bag body. Sufficient flexibility can be obtained if the thickness of the first base material 16 is equal to or less than the upper limit.
A preferable aspect of the thickness of the second substrate 20 is the same as a preferable aspect of the thickness of the first substrate 16 . The thicknesses of the first substrate 16 and the second substrate 20 may be the same or different.

The width of the first base material 16 is preferably 2 to 60 mm, more preferably 3 to 40 mm. If the width of the first base material 16 is equal to or greater than the lower limit, sufficient sealing strength can be obtained when the fitting 10 is thermally welded to the bag body. If the width of the first base material 16 is equal to or less than the upper limit, handling is easy, and deformation of fittings is less likely to occur during distribution and storage.
A preferred aspect of the width of the second substrate 20 is the same as a preferred aspect of the width of the first substrate 16 .
The width of the first substrate 16 and the width of the second substrate 20 may be the same or different.

The first substrate 16, the first fitting portion 18, the second substrate 20 and the second fitting portion 22 are made of the resin composition (X). The resin composition (X) will be described later in detail. The resin composition (X) forming the first substrate 16, the first fitting portion 18, the second substrate 20, and the second fitting portion 22 may be the same or different.

Since the first substrate 16, the first fitting portion 18, the second substrate 20, and the second fitting portion 22 are made of the resin composition (X), the fitting 10 is composed of cellulose powder and a thermoplastic resin. including.
The ratio of the cellulose powder to the total mass of the fitting 10 is preferably more than 50% by mass, more preferably more than 53% by mass. If the proportion of cellulose powder is equal to or higher than the above lower limit, the effect of reducing the amount of synthetic resin used in the bag with fittings is excellent. Moreover, sufficient rigidity is exhibited even when the proportion of the thermoplastic resin is small.
Moreover, the ratio of the cellulose powder to the total mass of the fitting 10 is preferably 85% by mass or less, more preferably 75% by mass or less, even more preferably 65% by mass or less, and particularly preferably 56% by mass or less. If the ratio of the cellulose powder is equal to or less than the above upper limit, the toughness of the fitting 10 is more excellent.

(resin composition)
The resin composition (X) contains cellulose powder and a thermoplastic resin.
Thermoplastic resins include ethylene-vinyl acetate copolymer (hereinafter also referred to as "EVA") and maleic anhydride-modified polyolefin (hereinafter also referred to as "MA-PO").

The average particle size of the cellulose powder is 20 μm or less, preferably 15 μm or less, more preferably 10 μm or less. If the average particle size is equal to or less than the above upper limit, the moldability and toughness of the resin composition will be more excellent.
Moreover, the average particle size of the cellulose powder is preferably 5 μm or more. If the average particle size is at least the above lower limit, the rigidity of the resin composition is more excellent.
The average particle size is measured with a laser diffraction particle size distribution analyzer.

Cellulose powder is, for example, refined high-purity cotton linter, pulp derived from wood, bamboo, bagasse, etc., and powder obtained by pulverizing these pulps with a pulverizer such as a knife mill, vertical roller mill, jet mill, etc. It can be produced by using pulp as a raw material and classifying it so as to have the desired average particle size.
Cellulose powder may use a commercial item. Commercially available products of cellulose powder include KC Flock manufactured by Nippon Paper Industries Co., Ltd., cellulose microfiber manufactured by Rettenmeyer Japan Co., Ltd., and the like.

EVA contains ethylene units and vinyl acetate units.
EVA may further contain monomeric units other than ethylene units and vinyl acetate units, if necessary, as long as the properties of EVA are not impaired.

The ethylene unit content of EVA (hereinafter also referred to as "ethylene content") is preferably 60 to 90% by mass, more preferably 70 to 85% by mass, based on the total mass of all monomer units constituting EVA. is more preferred. If the ethylene content is at least the above lower limit, the rigidity of the resin composition (X) is more excellent, and if it is at most the above upper limit, the toughness of the resin composition (X) is more excellent.

The vinyl acetate unit content of EVA (hereinafter also referred to as "vinyl acetate content") is preferably 10 to 40% by mass, more preferably 15 to 30%, based on the total mass of all monomer units constituting EVA. % by mass is more preferred. If the vinyl acetate content is at least the above lower limit, the toughness of the resin composition (X) is more excellent, and if it is at most the above upper limit, the rigidity of the resin composition (X) is more excellent.

The melt mass flow rate (MFR) of EVA is preferably 0.5 to 400 g/10 minutes, more preferably 3 to 400 g/10 minutes. When the MFR of EVA is at least the above lower limit, the rigidity of the resin composition (X) is more excellent, and when it is at most the above upper limit, the resin composition (X) is more excellent in toughness, moldability and appearance.
The MFR of EVA is measured according to JIS K 6924-1 under conditions of a temperature of 125° C. and a load of 3.19 N.

EVA preferably has a flexural modulus of 5 to 150 MPa, more preferably 10 to 50 MPa. When the flexural modulus of EVA is within the above range, the flexural modulus of the resin composition (X) tends to be within the preferred range described below.
The flexural modulus is measured according to JIS K 7171 under conditions of a temperature of 23° C. and a relative humidity of 50%.

MA-PO functions as a compatibilizer. When the thermoplastic resin contains MA-PO, the cellulose powder is easily dispersed in EVA.
Examples of MA-PO include α-olefin-maleic anhydride copolymers, mixtures of α-olefin polymers and maleic anhydride, and mixtures of α-olefins, α-olefin-maleic anhydride copolymers and maleic anhydride. A mixture etc. are mentioned.
Examples of α-olefins include ethylene and propylene.

The melt viscosity of MA-PO is preferably 100 to 15000 mPa·s, more preferably 200 to 5000 mPa·s. If the melt viscosity of MA-PO is at least the above lower limit, toughness and moldability will be more excellent, and if it is at most the above upper limit, rigidity will be more excellent.
Melt viscosity is measured by a capillary rheometer.

The acid value of MA-PO is preferably 5-150 mgKOH/g, more preferably 30-100 mgKOH/g. If the acid value of MA-PO is at least the above lower limit, moldability will be better, and if it is at most the above upper limit, the appearance will be better.
Acid number is measured by neutralization titration.

The thermoplastic resin preferably further contains a thermoplastic olefin elastomer (hereinafter also referred to as "TPO"). When the thermoplastic resin contains TPO, the toughness of the resin composition (X) is improved.

Examples of TPO include propylene-ethylene copolymerized thermoplastic elastomers, ethylene-propylene-diene terpolymerized thermoplastic elastomers, and the like. Among these, a propylene-ethylene copolymer thermoplastic elastomer is preferable in terms of moldability and toughness.
The ethylene content of the propylene-ethylene copolymer thermoplastic elastomer is preferably 5 to 30% by mass, more preferably 15 to 20% by mass, based on the total mass of all monomers constituting the propylene-ethylene copolymer thermoplastic elastomer. preferable.

The MFR of TPO is preferably 0.5 to 10 g/10 minutes, more preferably 3 to 5 g/10 minutes. If the MFR of TPO is at least the above lower limit, the rigidity of the resin composition (X) is more excellent, and if it is at most the above upper limit, the toughness and moldability of the resin composition (X) are more excellent.
The MFR of TPO is measured according to JIS K 6922-1 (ASTM D1238) under conditions of a temperature of 190° C. and a load of 2.16 kg (21.18 N).

The melting point of TPO is preferably 50 to 160°C, more preferably 50 to 80°C. If the melting point of TPO is at least the above lower limit, toughness will be better, and if it is at most the above upper limit, rigidity will be better. Melting points are measured by differential scanning calorimetry (DSC).

The flexural modulus of TPO is preferably 5 to 50 MPa, more preferably 5 to 10 MPa. When the flexural modulus of TPO is within the above range, the flexural modulus of the resin composition (X) tends to fall within the preferred range described below.

The thermoplastic resin may further contain other thermoplastic resins than those described above, if necessary. Other thermoplastic resins include, for example, polyethylene and polyurethane.

The resin composition (X) may further contain components other than the cellulose powder and the thermoplastic resin, if necessary. Other components include additives such as stabilizers, antioxidants, lubricants, antistatic agents, and colorants.

The ratio of the cellulose powder to the total mass of the resin composition (X) is more than 50% by mass, preferably more than 53% by mass. If the proportion of cellulose powder is equal to or higher than the above lower limit, the effect of reducing the amount of synthetic resin used in the bag with fittings is excellent. Moreover, sufficient rigidity is exhibited even when the proportion of the thermoplastic resin is small.
Moreover, the ratio of the cellulose powder to the total mass of the resin composition (X) is preferably 85% by mass or less, more preferably 75% by mass or less, still more preferably 65% by mass or less, and particularly preferably 56% by mass or less. If the proportion of the cellulose powder is equal to or less than the above upper limit, the toughness and moldability of the resin composition (X) are more excellent.

The ratio of the thermoplastic resin to the total mass of the resin composition (X) is less than 50% by mass, preferably 47% by mass or less. If the proportion of the thermoplastic resin is equal to or less than the above upper limit, the effect of reducing the amount of synthetic resin used in the bag with fittings is excellent.
Moreover, the proportion of the thermoplastic resin to the total mass of the resin composition (X) is preferably 15% by mass or more, more preferably 25% by mass or more, still more preferably 35% by mass or more, and particularly preferably 44% by mass or more. When the proportion of the thermoplastic resin is at least the above lower limit, the toughness and moldability of the resin composition (X) are more excellent.

The ratio of EVA to the total mass of resin composition (X) is preferably 5% by mass or more, more preferably 10% by mass or more. When the thermoplastic resin does not contain TPO, it is more preferably 20% by mass or more, particularly preferably 30% by mass or more. When the proportion of EVA is at least the above lower limit, the rigidity of the resin composition (X) is more excellent.
Moreover, the ratio of EVA to the total mass of the resin composition (X) is preferably less than 45% by mass. When the thermoplastic resin contains TPO, it is more preferably less than 35% by mass, even more preferably less than 25% by mass, and particularly preferably less than 20% by mass. If the proportion of EVA is equal to or less than the above upper limit, the toughness of the resin composition (X) is more excellent.

The ratio of MA-PO to the total mass of resin composition (X) is preferably 5% by mass or more, more preferably 7% by mass or more, and even more preferably 9% by mass or more. When the proportion of MA-PO is at least the above lower limit, the toughness and moldability of the resin composition (X) are more excellent.
The proportion of MA-PO in the total mass of resin composition (X) is preferably less than 15% by mass, more preferably less than 13% by mass, and even more preferably less than 11% by mass. If the proportion of MA-PO is equal to or less than the above upper limit, the rigidity and appearance of the resin composition (X) are more excellent.

When the thermoplastic resin contains TPO, the ratio of TPO to the total mass of resin composition (X) is preferably 10% by mass or more, more preferably 15% by mass or more. When the proportion of TPO is at least the above lower limit, the toughness and moldability of the resin composition (X) are more excellent.
Moreover, the proportion of TPO to the total mass of the resin composition (X) is preferably less than 40% by mass, more preferably less than 28% by mass. If the proportion of TPO is equal to or less than the above upper limit, the rigidity of the resin composition (X) is more excellent.

When the thermoplastic resin does not contain TPO, the resin composition (X) contains more than 50% by mass of cellulose powder and 10% by mass or less of EVA with respect to the total mass of the resin composition (X). It is preferable that the proportion of MA-PO is 5% by mass or more and less than 15% by mass, the proportion of cellulose powder is more than 50% by mass and less than 60% by mass, and the proportion of EVA is 20% by mass or more. More preferably, it is less than 45% by mass, and the MA-PO ratio is 5% by mass or more and less than 15% by mass.

When the thermoplastic resin contains TPO, the resin composition (X) contains more than 50% by mass and 75% by mass or less of cellulose powder and 10% by mass of EVA relative to the total mass of the resin composition (X). % or more and less than 35% by mass, the proportion of MA-PO is preferably 5% by mass or more and less than 15% by mass, the proportion of TPO is preferably 10% by mass or more and less than 28% by mass, and the proportion of cellulose powder is more than 50% by mass and less than 60% by mass. More preferably, the proportion of EVA is 20% by mass or more and less than 35% by mass, the proportion of MA-PO is 5% by mass or more and less than 15% by mass, and the proportion of TPO is 16% by mass or more and less than 28% by mass. .

The ratio of the other thermoplastic resin to the total mass of the resin composition (X) is preferably 0% by mass or more and less than 10% by mass, more preferably 0% by mass or more and less than 5% by mass.

The ratio of the other components to the total mass of the resin composition (X) is preferably 0% by mass or more and less than 5% by mass, more preferably 0% by mass or more and less than 2% by mass.

The maximum draw ratio of the resin composition (X) is preferably 270% or more, more preferably 270 to 430%. When the maximum draw ratio of the resin composition (X) is 270% or more, the toughness of the resin composition (X) is more excellent, and cracks occur in the first fitting portion 18 and the second fitting portion 22 during attachment and detachment. Hateful. Further, when the maximum draw ratio of the resin composition (X) is 270 to 430%, moldability is good, and the first fitting portion 18 and the second fitting portion 22 are easy to mold.
The maximum draw ratio is obtained by the following method.
Using a capillary rheometer, a sample (resin composition (X)) is melted and extruded from a die at a temperature of 170° C. and an extrusion speed of 10 mm/min. /min, the maximum drawing speed is defined as the maximum drawing speed when the melt is broken at the exit of the die, and the maximum draw ratio is calculated by the following formula. The acceleration of the take-up speed shall be 0.1 m/min ² . A detailed measuring method is as described in Examples described later.
Maximum draw ratio = maximum take-up speed (mm/min)/extrusion speed (mm/min)
(For example, when the maximum take-up speed is 2 m/min (2×10 ³ mm/min), the maximum draw ratio is 2×10 ³ /10=200.)

The bending elastic modulus of the resin composition (X) is preferably 110-270 MPa, more preferably 110-150 MPa. If the flexural modulus is at least the above lower limit, the rigidity of the resin composition (X) is more excellent, and if it is at most the above upper limit, the resin composition (X) is more excellent in toughness.
The flexural modulus is measured according to JIS K 7171 under the conditions of a temperature of 23° C., a relative humidity of 50%, and a test speed of 1 mm/min±20%.

The tensile yield stress of the resin composition (X) is preferably 4-13 MPa, more preferably 4-9 MPa. If the tensile yield stress is at least the above lower limit, the toughness and formability are more excellent, and if it is at most the above upper limit, the rigidity is more excellent.
The tensile yield stress is measured according to JIS K 7161-1 under the conditions of a temperature of 23° C., a relative humidity of 50%, and a test speed of 50 mm/min±10%.

(Production method)
As a method for manufacturing the fitting 10, the resin composition (X) is used as the material for forming the first base material 16, the first fitting part 18, the second base material 20 and the second fitting part 22. It is not particularly limited, and a known method can be adopted.
For example, cellulose powder and MA-PO are mixed, the resulting mixture, EVA, and optionally TPO are melt-kneaded to obtain a resin composition (X), and the obtained resin composition (X) is molded. and obtain the first fitting member 12 or the second fitting member 14 .
Mixing methods include a dry mixing method using a super mixer, a Henschel mixer, or the like.
Examples of the melt-kneading method include a method of supplying raw materials to a melt-kneader such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneader, or a mixing roll and melt-kneading them.
The molding method includes an extrusion molding method, an injection molding method, an inflation molding method, a vacuum molding method, and the like.

In addition, the fitting tool of this invention is not limited to the fitting tool 10 described above.
For example, the fitting of the present invention may be the fitting 10A illustrated in FIG. The same parts in FIG. 2 as those in FIG.
In the fitting 10A, the first fitting member 12 includes the first seal layer 26 laminated on the outer surface 16d side of the first base material 16, and the second fitting member 14 includes the second base material 20. It is the same as the fitting 10 except that it has a second sealing layer 30 laminated on the side of the outer surface 20d.
In the fitting 10A, as the resin composition (X), the ratio of the cellulose powder to the total mass of the resin composition (X) is higher than the ratio of the cellulose powder to the total mass of the fitting 10A. . The preferred ratio of cellulose powder to the total mass of the fitting 10A is the same as that of the fitting 10A.

As the first seal layer 26, a known seal layer can be employed, and examples include linear low-density polyethylene, high-pressure low-density polyethylene, high-density polyethylene, polypropylene, ethylene-(meth)acrylic acid alkyl ester copolymer, Olefin elastomers, styrene elastomers, acid-modified olefin resins, ethylene-vinyl acetate copolymers, ionomers, and the like.
Aspects of the second sealing layer 30 are similar to those of the first sealing layer 26 .
Known additives such as stabilizers, antioxidants, lubricants, antistatic agents, and colorants may be added to the first seal layer 26 and the second seal layer 30 as necessary.

The thickness of the first sealing layer 26 is preferably 0.01-0.2 mm, more preferably 0.05-0.1 mm. If the thickness of the first sealing layer 26 is equal to or greater than the lower limit, sufficient sealing strength can be obtained when the fitting is thermally welded to the bag body. Sufficient flexibility can be obtained if the thickness of the first seal layer 26 is equal to or less than the upper limit. Moreover, the ratio of the cellulose powder to the total mass of the fitting 10 can be increased.
Preferred aspects of the thickness of the second sealing layer 30 are the same as preferred aspects of the thickness of the first sealing layer 26 .

Moreover, the fitting of the present invention may have one or more other layers between the first substrate and the first sealing layer or between the second substrate and the second sealing layer. Other layers include barrier layers, adhesive layers, and the like. Polyvinyl alcohol etc. are mentioned as a material of a barrier layer. Examples of materials for the adhesive layer include ethylene-vinyl acetate copolymers.

Moreover, the first fitting portion and the second fitting portion in the fitting tool of the present invention are not limited to the combination of the male fitting portion and the female fitting portion. For example, each of the first fitting part and the second fitting part has a plurality of parallel male fitting parts, and the two male fitting parts face each other with the heads of the male fitting parts. You may make it attach or detach by inserting between and hooking each other.

[Bag body with fitting]
A bag with fittings of the present invention comprises a bag body for containing contents, and fittings of the present invention attached to the inner surface of the bag body.
The bag body with fittings of the present invention can adopt a known aspect except that the fittings of the present invention are provided.

Hereinafter, as an example of the bag body with fittings of the present invention, a bag body 1 with fittings (hereinafter referred to as "bag body 1") provided with the aforementioned fittings 10 will be described.
As shown in FIG. 3, the bag body 1 of the present embodiment includes a bag body 50 in a sealed state that accommodates contents, and a fitting that is attached to the upper inner surface of the bag body 50 along the lateral direction. A fitting 10 is provided.

The bag main body 50 is formed by superimposing a first film material 52 and a second film material 54, and heat-sealing all of their peripheral edge portions 56, and is in a sealed state. Further, an auxiliary cutting line 58 is provided in the lateral direction above the fitting tool 10 in the bag body 50, and a notch 60 is formed at the end thereof.

The outer surface 16d of the first base material 16 of the fitting 10 is welded to the first film material 52 of the bag body 50, and the outer surface 20d of the second base material 20 of the fitting 10 is welded. It is welded to the second film material 54 of the bag body 50 . In addition, the fitting 10 is arranged such that the first side edge 16b of the first base material 16 and the first side edge 20b of the second base material 20 are on the opening side, and the second side edge 16c of the first base material 16 is on the side of the opening. and the second side edge 20c of the second base material 20 is attached so as to face the contents.

The shape of the bag body 50 is rectangular in this embodiment. However, the shape of the bag body 50 is not limited to a rectangle. Also, the size of the bag body 50 is not particularly limited, and may be appropriately selected according to the contents to be accommodated in the bag body 50 .

The first film material 52 and the second film material 54 forming the bag body 50 may be any material that can weld the fitting 10 by heat sealing. A laminate film having a layer and a base layer and having a sealant layer positioned on one of the outermost layers (on the inner surface side of the bag body) can be mentioned. The laminated film may further have a functional layer such as a barrier layer.

As the sealant layer, linear low-density polyethylene, high-pressure low-density polyethylene, high-density polyethylene, ethylene-(meth)acrylic acid alkyl ester copolymer, unstretched polypropylene, ethylene-vinyl acetate copolymer, ionomer, etc. mentioned.
The thickness of the sealant layer is preferably 0.01-0.05 mm, more preferably 0.01-0.02 mm. If the thickness of the sealant layer is at least the lower limit, sufficient seal strength can be obtained. If the thickness of the sealant layer is equal to or less than the upper limit, the synthetic resin content of the bag 1 can be made lower.

The substrate layer includes paper, biaxially oriented nylon, biaxially oriented polypropylene, and the like.
From the viewpoint of reducing the synthetic resin content of the bag 1, paper containing pulp is preferable as the base material layer. Paper containing pulp includes woodfree paper, art paper, coated paper, pure white roll paper, bleached single-glazed kraft paper, special double bleached kraft paper, bleached kraft paper, and the like.
The basis weight of the paper is preferably 40-100 g/m ^{2 , more preferably 50-70 g/m 2 .}
Laminated paper etc. are mentioned as an example of the laminated|multilayer film which uses paper as a base material layer.

The cutting assistance line 58 is a line that cuts the portion of the bag body 50 above the fitting 10 to assist the opening. The auxiliary cutting line 58 may be, for example, a weakened line formed by making the portion of the auxiliary cutting line 58 of the first film material 52 and the second film material 54 of the bag body 50 thinner than the other portions. A weakening line consisting of pores formed in a row can be mentioned. Further, the auxiliary cutting line 58 is not limited to the weakened line, and may be a line formed by printing or the like, which indicates the position to be cut with scissors, a cutter, or the like.
Although the auxiliary cutting line 58 is formed along the lateral direction of the bag body 50 in this embodiment, it is not limited to this form, and may be provided inclined with respect to the width direction of the bag body 50. good.

Although the shape of the notch 60 is triangular in this example, it is not particularly limited, and may be semicircular, linear, or the like.
The bag body 1 can be manufactured by a known method except using the fitting 10 .

When opening the bag body 1, the upper part of the bag body 50 is cut along the auxiliary cutting line 58 from the notch 60 and removed, thereby forming an opening 62 in the upper part as shown in FIG. can be done. The opening 62 formed in the bag 1 can be repeatedly opened and closed by attaching and detaching the first fitting portion 18 and the second fitting portion 22 of the fitting 10 .

In addition, the bag body with fittings of the present invention is not limited to the bag body 1 described above.
For example, the bag with fittings of the present invention may be a bag with fittings other than the fitting 10 described above.
Moreover, the bag body of the bag with fittings is not particularly limited, and various types of bag bodies known as bag bodies with fittings can be adopted. For example, the bag body 1 is a sealed bag body until it is unsealed using the auxiliary cutting line 58, but it may be a bag body with fittings having a bag body in which an opening is formed in advance.

EXAMPLES The present invention will be specifically described below with reference to Examples, but the present invention is not limited by the following description. "Parts" means "mass parts".

[material]
Raw materials used in this example are shown below.
EVA1: "Ultrasen YX11" manufactured by Tosoh, EVA, MFR = 0.2 g/10 min, vinyl acetate content = 32% by mass, density 956 kg/m ³ , flexural modulus 10 MPa.
EVA2: "Ultrasen 626" manufactured by Tosoh, EVA, MFR = 3 g/10 min, vinyl acetate content = 15% by mass, density 936 kg/m ³ , flexural modulus 50 MPa.
EVA3: "Ultrasen 722" manufactured by Tosoh, EVA, MFR = 400 g/10 min, vinyl acetate content = 28% by mass, density 944 kg/m ³ , flexural modulus 10 MPa.
PP: "Noblen FL6737" manufactured by Sumitomo Chemical, random polypropylene (homo), MFR = 3 g/10 min, density 894 kg/m ³ .
TPO: "Vistamaxx6102FL" manufactured by ExxonMobil, propylene-ethylene copolymer thermoplastic elastomer, ethylene content 16 mass %, MFR = 3 g/10 min, melting point 55°C, flexural modulus 14 MPa.
MA-PO1: "Diacarna 30M" manufactured by Mitsubishi Chemical, olefin wax (66.8% by mass of α-olefin-maleic anhydride copolymer, 32.9% by mass of α-olefin polymer, 0.9% by mass of maleic anhydride) 3% by mass), melting point 70-76° C., melt viscosity 140-210 mPa·s, acid value 95-110 mgKOH/g.
MA-PO2: "Umex 1010" manufactured by Sanyo Chemical Industries, α-olefin-maleic anhydride copolymer, melting point 135°C, melt viscosity 6000 mPa·s, acid value 52 mgKOH/g.
KC Flock W-06MG, W-10MG2, W-300F and W-100F manufactured by Nippon Paper Industries Co., Ltd. were used as the cellulose powder. When the average particle size of each cellulose powder was measured using a laser diffraction particle size distribution analyzer (dry particle size distribution meter "MASTER SIZER 3000" manufactured by Malvern), the average particle size of W-06MG was 6 μm, and that of W-10MG2 was 6 μm. The average particle size of W-300F was 10 μm, the average particle size of W-300F was 28 μm, and the average particle size of W-100F was 37 μm.

[Examples 1 to 12, Comparative Examples 1 to 13]
(Preparation of resin composition)
Resin compositions were prepared according to the following procedures according to the formulations shown in Tables 1-3.
First, cellulose powder and MA-PO were mixed in a super mixer to obtain a mixture.
Next, the obtained mixture and the remaining raw materials (EVE, PP, TPO) are melt-kneaded in a co-rotating twin-screw extruder at a molding temperature of 150 to 180 ° C. and a screw rotation speed of 40 to 100 rpm. A strand of 2 to 4 mm was extruded, and the extruded kneaded material was cut to obtain pellets of the resin composition.

(Manufacturing fitting tool)
A fitting having the form shown in FIG. 1 was produced by the following procedure.
A composite profile die was provided for forming a first fitting member having a male fitting portion and a second fitting member having a female fitting portion. The pellets of the resin composition are melt-kneaded in a single-screw extruder at a molding temperature of 150 to 180 ° C., led to the composite deformed die and co-extruded, and then led to a cooling water tank to cool and solidify. It was wound up with a winding machine. The thickness of the first base material and the second base material was 0.2 mm.

(evaluation)
[Dispersibility]
A pellet of the resin composition was injection molded at a temperature of 150 to 180° C. to obtain a sheet-like test piece with a thickness of 3 mm. A cross section of a part of the obtained test piece cut with a microtome was observed with a microscope and evaluated according to the following criteria.
◯: Aggregates with a maximum diameter of 50 μm or more are not present in a randomly selected range of 100 mm×100 mm.
x: Aggregates with a maximum diameter of 50 μm or more are present in a randomly selected range of 100 mm×100 mm.

[Possibility of zipper molding]
In the production of the above-mentioned fitting, when the fitting could be molded without problems, the fitting part (first fitting part, second fitting part) or strip-shaped base material (first base (material, second base material) was evaluated as × (molding not possible).

[Maximum draw ratio]
For the pellets of the resin composition, the maximum draw ratio was determined in accordance with JIS K 7199 using a capillograph (capillary rheometer) manufactured by Toyo Seiki Seisakusho Co., Ltd. according to the following procedure.
1. Pellets of the resin composition are filled in a cylinder having a die installed at the outlet and melted by heating to 170°C.
2. The piston is lowered from the inlet of the cylinder at a speed of 10 mm/min (constant). As a result, the melt is extruded at a speed of 10 mm/min from a die outlet having a diameter of Φ1 mm.
3. A strand-shaped melt extruded from the die is passed through a pulley and sandwiched between take-up rolls.
4. The take-up roll speed is started from 1 m/min and gradually increased. The acceleration of the take-up speed at this time shall be 0.1 m/min ² .
5. Record the take-off speed when the melt at the die exit breaks.
6. The above operations 1 to 5 are repeated 3 times in total (N=3), the recorded minimum value of the take-up speed is taken as the maximum take-up speed, and the maximum draw ratio is calculated by the following formula.
Maximum draw ratio = maximum take-up speed (mm/min)/extrusion speed (mm/min)
If the take-up speed could not be measured, it was marked as "impossible."

[Flexural modulus]
Pellets of the resin composition were injection molded at a temperature of 150 to 180° C. to obtain a sheet having a thickness of 3 mm, and then cut into a width of 25±0.5 mm×length of 60±3 mm to obtain a test piece. The flexural modulus of the obtained test piece was determined according to JIS K 7171 under the conditions of a temperature of 23° C., a relative humidity of 50%, and a test speed of 1 mm/min±20%.

[Tensile yield stress]
Pellets of the resin composition were injection molded at a temperature of 170° C. to obtain a sheet having a thickness of 3 mm, and then a 1B-shaped test piece was cut out according to JIS K 7161-2. The tensile yield stress of the obtained test piece was determined according to JIS K 7161-1 under the conditions of a temperature of 23° C., a relative humidity of 50%, and a test speed of 50 mm/min±10%.

Tables 1 to 3 show the evaluation results of each example.
In Tables 1 to 3, "-" indicates that no measurement or evaluation was performed.

1 bag with fitting 10, 10A fitting 12 first fitting member 14 second fitting member 16 first substrate 18 first fitting portion 20 second substrate 22 second fitting portion 26 first Seal layer 30 Second seal layer 50 Bag body

Claims (9)

A pair of strip-shaped first fitting member and second fitting member are provided,
The first fitting member includes a strip-shaped first base material and a first fitting portion provided along the longitudinal direction on the facing surface of the first base material,
The second fitting member is provided along the longitudinal direction on the facing surface of the second base material and the second base material, and is detachably fitted to the first fitting part. A fitting comprising:
The first substrate, the first fitting portion, the second substrate and the second fitting portion are made of a resin composition containing cellulose powder and a thermoplastic resin,
The ratio of the cellulose powder to the total mass of the resin composition is more than 50% by mass,
The average particle size of the cellulose powder is 20 μm or less,
A fitting, wherein the thermoplastic resin contains an ethylene-vinyl acetate copolymer and a maleic anhydride-modified polyolefin. 2. The fitting according to claim 1, wherein the proportion of said cellulose powder relative to the total weight of said fitting is greater than 50% by weight. The ratio of the cellulose powder to the total weight of the resin composition is more than 50% by mass and 85% by mass or less, the ratio of the ethylene-vinyl acetate copolymer is 10% by mass or more and less than 45% by mass, and the maleic anhydride-modified polyolefin The fitting according to claim 1 or 2, wherein the ratio is 5% by mass or more and less than 15% by mass. The fitting according to any one of claims 1 to 3, wherein said thermoplastic resin further comprises a thermoplastic olefinic elastomer. The ratio of the cellulose powder to the total weight of the resin composition is more than 50% by mass and 75% by mass or less, the ratio of the ethylene-vinyl acetate copolymer is 10% by mass or more and less than 35% by mass, and the maleic anhydride-modified polyolefin 5. The fitting according to claim 4, wherein the proportion is 5% by mass or more and less than 15% by mass, and the proportion of the thermoplastic olefinic elastomer is 10% by mass or more and less than 28% by mass. The fitting according to any one of claims 1 to 5, wherein the resin composition has a maximum draw ratio of 270% or more. The fitting according to any one of claims 1 to 6, wherein the resin composition has a flexural modulus of 110 to 270 MPa. The first fitting member comprises a first sealing layer laminated on the outer surface side of the first base material,
The fitting according to any one of claims 1 to 7, wherein the second fitting member comprises a second sealing layer laminated on the outer surface side of the second base material. A bag with a fitting, comprising: a bag body for containing contents; and the fitting according to any one of claims 1 to 8 attached to the inner surface of the bag body.

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