JP7430566B2 - Fitting tool and bag with fitting tool - Google Patents

Description

The present invention relates to a fitting and a bag with a fitting.

BACKGROUND ART In various fields such as food, medicine, miscellaneous goods, etc., bags with fittings are widely used, in which fittings are attached to the inner surface of the bag body near the opening to open and close the opening. As the fitting tool, a first fitting part and a second fitting part which are removably fitted to each other are provided on the opposing surfaces of each of the pair of band-shaped base materials along the longitudinal direction of the base materials. (For example, Patent Document 1).

Japanese Patent Application Publication No. 2003-160147

However, the conventional fitting tool as described in Patent Document 1 uses fossil fuel-derived polyethylene or the like as the resin material, and is not able to deal with the environmental burden and the saving of exhaustible resources.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fitting tool that can reduce environmental load. Another object of the present invention is to provide a bag with a fitting using such a fitting.

In order to solve the above problems, the present invention can adopt the following aspects.

[1] A belt-shaped first fitting member; a belt-shaped second fitting member paired with the first fitting member; the first fitting member includes a belt-shaped first base material; A first fitting portion provided along the longitudinal direction of the first base material on one surface of the first base material, and overlapping with the first base material on the other surface of the first base material. and a first sealing layer provided on a strip-shaped second base material, and a first seal layer provided on one surface of the second base material along the longitudinal direction of the second base material. and a second fitting part that is provided in the first fitting part and can be removably fitted to the first fitting part, and the forming material of the first base material is a resin composition (A), The composition (A) contains a biomass-derived polyethylene resin obtained by polymerizing a monomer containing biomass-derived ethylene, and the forming material of the first seal layer is a resin composition (B), and the resin Composition (B) is a fitting tool containing at least one of a homopolymer of fossil fuel-derived ethylene and a copolymer of fossil fuel-derived ethylene and fossil fuel-derived α-olefin.

[2] The forming material of the second base material is the resin composition (A), and a second seal layer provided on the other surface of the second base material overlaps with the second base material. The fitting according to [1], wherein the material forming the second seal layer is the resin composition (B).

[3] The resin composition (A) may include a fossil fuel-derived polyethylene resin obtained by polymerizing a monomer containing fossil fuel-derived ethylene, and the biomass-derived polyethylene resin and the fossil fuel-derived polyethylene resin The polyethylene resins have a density of 900 kg/m ³ or more and 940 kg/m ³ or less, and a melt flow rate of 0.5 g/10 minutes or more and 15 g/10 minutes or less, and the resin composition (B) is The copolymer has a density of 850 kg/m ³ or more and 920 kg/m ³ or less, and a melt flow rate of 0.5 g/10 minutes or more and 15 g/10 minutes or less, and the resin composition The fitting tool according to [1] or [2], wherein the density A of (A) and the density B of the resin composition (B) satisfy [density A]≧[density B].

[4] The fitting according to any one of [1] to [3], wherein the content of the copolymer in the resin composition (B) is 70% by mass or more and 100% by mass or less.

[5] The fitting tool according to any one of [1] to [4], wherein the biomass-derived polyethylene resin has a plant content of 70% or more as measured in accordance with ASTM D6866-11.

[6] The fitting tool according to any one of [1] to [5], and a bag main body that accommodates contents, the fitting tool being attached to the inner surface of the bag main body. Bag body with fitting tool.

According to the present invention, a fitting tool that can reduce environmental load can be provided. Moreover, it is possible to provide a bag with a fitting using such a fitting.

FIG. 1 is a schematic perspective view showing a fitting tool of this embodiment. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a schematic front view showing the bag body 100 with a fitting device of this embodiment. FIG. 4 is a schematic perspective view showing the bag 100 opened. FIG. 5 is a schematic diagram illustrating a seal temperature evaluation method.

Hereinafter, a fitting tool and a bag body with a fitting tool according to an embodiment of the present invention will be described with reference to the drawings. Note that in all the drawings below, the dimensions and ratios of each component are changed as appropriate to make the drawings easier to read.

《Fitting tool》
FIG. 1 is a schematic perspective view showing a fitting tool of this embodiment. FIG. 2 is a sectional view taken along line II-II in FIG.

As shown in FIGS. 1 and 2, the fitting tool 1 of this embodiment includes a first fitting member 10 and a second fitting member 20. The first fitting member 10 and the second fitting member 20 are each band-shaped members. The first fitting member 10 and the second fitting member 20 are used in pairs.

[First fitting member]
The first fitting member 10 has a first base material 11 , a first fitting part 12 , and a first sealing layer 15 .

(First base material)
The first base material 11 is a band-shaped member and supports the first fitting part 12 and the first seal layer 15.

The thickness T1 of the first base material 11 is preferably 0.05 mm or more, more preferably 0.1 mm or more. Moreover, the thickness T1 of the first base material 11 is preferably 0.4 mm or less, more preferably 0.3 mm or less. The upper limit and lower limit of the thickness T1 can be arbitrarily combined.

If the thickness T1 of the first base material 11 is at least the lower limit value, sufficient sealing strength can be obtained when the fitting tool 1 of this embodiment is thermally welded to the bag body. If the thickness T1 of the first base material 11 is less than or equal to the upper limit value, the fitting tool of this embodiment will be flexible and have an excellent usability.

The width W1 of the first base material 11 is preferably 2 mm or more, more preferably 3 mm or more. Further, the width W1 of the first base material 11 is preferably 60 mm or less, more preferably 40 mm or less. The upper limit and lower limit of the width W1 can be arbitrarily combined.

If the width W1 of the first base material 11 is equal to or greater than the lower limit value, sufficient sealing strength can be obtained when the fitting tool 1 of this embodiment is thermally welded to the bag body. If the width W1 of the first base material 11 is equal to or less than the upper limit value, handling is easy and the fitting tool 1 is less likely to be deformed during distribution and storage.

(Resin composition (A))
The material forming the first base material 11 is a resin composition (A). The resin composition (A) contains a biomass-derived polyethylene resin obtained by polymerizing a monomer containing biomass-derived ethylene.

In this specification, "biomass-derived" is a description used to distinguish from fossil fuel-derived, and means "an organic resource derived from living organisms excluding fossil fuels." Fossil fuels include coal, oil, and natural gas.

"Biomass-derived ethylene" is obtained, for example, from ethanol obtained by fermenting sugar, which is biomass. As the biomass-derived ethylene, any ethylene obtained from biomass can be used regardless of the production method.

"Biomass-derived polyethylene resin" means a polymer obtained by polymerizing a monomer containing biomass-derived ethylene. In the following explanation, "biomass-derived polyethylene resin" may be abbreviated as "polyethylene (A)".

"Polyethylene resin" means a polymer having a polyethylene structure derived from ethylene as a structural unit.

Whether the polyethylene resin is derived from biomass can be determined by the "vegetable content" measured in accordance with ASTM D6866-11.

Carbon constituting the biomass-derived monomer includes radioactive carbon (carbon-14, ¹⁴ C), which is a radioactive isotope. On the other hand, carbon-14, which constitutes the monomer derived from fossil fuels, is attenuated by radioactive decay and reduced to below the detection limit. Measurements based on ASTM D6866-11 detect radiation emitted from biomass-derived radiocarbon. If the concentration of carbon-14 contained in the biomass-derived monomer is known, the content of biomass-derived carbon can be calculated by measuring the concentration of carbon-14 contained in the measurement target. The calculated “biomass-derived carbon content” is defined as “vegetable content”.

(Polyethylene (A))
In addition to the structural units derived from biomass-derived ethylene, polyethylene (A) may further include structural units derived from fossil fuel-derived ethylene and α-olefins. The α-olefin may be derived from biomass or fossil fuel.

Examples of α-olefins include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-heptene, 4-methyl-1-pentene, 4-methyl-1-hexene, and 4,4-dimethyl- At least one selected from the group consisting of 1-pentene can be mentioned. That is, when polyethylene (A) is a polymer having structural units derived from ethylene and structural units derived from α-olefin, polyethylene (A) is a binary copolymer of ethylene and one type of polyolefin. It may be a combination, a terpolymer of ethylene and two types of polyolefins, or a copolymer of ethylene and three or more types of polyolefins.

Furthermore, the polyethylene (A) may have structural units derived from monomers other than ethylene and α-olefin, as long as the effects of the present invention are not impaired.

Other monomers include
Vinyl esters such as vinyl acetate;
Methacrylic acid esters such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate;
Unsaturated carboxylic acids such as (meth)acrylic acid;
Anhydrides of unsaturated dicarboxylic acids such as maleic anhydride;
Unsaturated dicarboxylic acid esters such as monomethyl maleate and dimethyl maleate;
Examples include (meth)acrylonitrile and styrene.

Note that (meth)acrylic acid means acrylic acid or methacrylic acid. Moreover, (meth)acrylonitrile means acrylonitrile or methacrylonitrile.

The vegetable content of polyethylene (A) is preferably 70% or more, more preferably 75% or more, and even more preferably 80% or more. Moreover, the vegetable content of polyethylene (A) may be 100% or less, may be 95% or less, or may be 90% or less.
The upper limit and lower limit of plant content can be arbitrarily combined.

If the vegetable content of polyethylene (A) is equal to or higher than the lower limit of the above range, the amount of fossil fuel-derived monomers used will be reduced, so that the environmental load can be reduced. On the other hand, if a large amount of polyethylene (A) with a high vegetable content is used, the surface of the fitting tool tends to become sticky. The lower the vegetable content of polyethylene (A), the easier it becomes to suppress stickiness on the surface of the fitting.

Specific examples of polyethylene (A) include extremely low density polyethylene using biomass-derived ethylene, high-pressure low density polyethylene, medium density polyethylene, and high density polyethylene. A specific example of polyethylene (A) is linear low density polyethylene (LLDPE), which is an ethylene-α-olefin copolymer.

Commercially available products of polyethylene (A) include, for example, the brand names "SHC7260", "SHD7255LSL", "SLH218", and "SLL118" manufactured by Braskem.

The number of polyethylenes (A) contained in the resin composition (A) may be one, or two or more.

(Polyethylene (B))
If the resin composition (A) that is the forming material of the first fitting member 10 is only polyethylene (A) with a high vegetable content, the surface of the member tends to become sticky. Therefore, the resin composition (A) preferably contains, in addition to polyethylene (A), a fossil fuel-derived polyethylene resin obtained by polymerizing a monomer containing fossil fuel-derived ethylene.

"Fossil fuel-derived polyethylene resin" refers to either or both of a fossil fuel-derived ethylene homopolymer and a copolymer of fossil fuel-derived ethylene and fossil fuel-derived α-olefin. Fossil fuel-derived polyethylene resin does not contain biomass-derived monomers. In the following description, the fossil fuel-derived polyethylene resin may be referred to as "polyethylene (B)." The vegetable content of polyethylene (B) is 0%.

Examples of polyethylene (B) include polyethylene resins similar to polyethylene (A) except that biomass-derived ethylene is not used.

The preferable ranges of MFR, density, and melting point of polyethylene (B) are the same as the preferable ranges of each physical property value of polyethylene (A).

The number of polyethylenes (B) contained in the resin composition (A) may be one, or two or more.

When the resin composition (A) contains polyethylene (A) and polyethylene (B), the content of polyethylene (B) is preferably 30% by mass or more with respect to the total amount of the resin composition (A), and 35% by mass % or more is more preferable, and 40 mass % or more is even more preferable. Further, the content of polyethylene (B) is preferably 95% by mass or less based on the total amount of the resin composition (A).
The upper limit and lower limit of the content of polyethylene (B) in the resin composition (A) can be arbitrarily combined.

When the content of polyethylene (B) is at least the lower limit of the above range, stickiness on the surface of the fitting can be easily suppressed. If the content of polyethylene (B) is below the upper limit of the above range, the environmental load can be easily reduced.

(Physical property values of polyethylene (A) and polyethylene (B))
It is preferable that the polyethylene (A) contained in the resin composition (A) and the polyethylene (B) that may be contained in the resin composition (A) each have the following physical property values.

(melt flow rate)
The melt flow rate (MFR) of polyethylene (A) and polyethylene (B) is preferably 0.5 g/10 minutes or more, more preferably 1.0 g/10 minutes or more, and even more preferably 1.5 g/10 minutes or more. Further, the MFR of polyethylene (A) and polyethylene (B) contained in the resin composition (A) is preferably 15 g/10 minutes or less, more preferably 12 g/10 minutes or less, and even more preferably 10 g/10 minutes or less.

The upper limit and lower limit of MFR of polyethylene (A) can be arbitrarily combined. Further, the upper limit and lower limit of MFR of polyethylene (B) can be arbitrarily combined.
The MFR of polyethylene (A) and polyethylene (B) is preferably 0.5 g/10 minutes or more and 15 g/10 minutes or less, for example.

When the MFR of polyethylene (A) and polyethylene (B) is at least the lower limit and below the upper limit of the range, it is easy to mold the fitting of this embodiment. When the MFR of polyethylene (A) and polyethylene (B) exceeds the upper limit of the above range, molding becomes difficult.

In this embodiment, the MFR of the resin is a value measured under the conditions of temperature: 190° C. and load: 2.16 kg in accordance with JIS K 7210-1.

(density)
When polyethylene (A) and polyethylene (B) are polyethylene, the density of polyethylene (A) and polyethylene (B) is preferably 900 kg/m ³ or more, more preferably 905 kg/m ³ or more. Further, the density of polyethylene (A) and polyethylene (B) is preferably 0.960 kg/m ³ or less, more preferably 950 kg/m ³ or less, even more preferably 940 kg/m ³ or less, particularly 935 kg/m ³ or less. preferable.

The upper limit and lower limit of the density of polyethylene (A) can be arbitrarily combined. Further, the upper limit and lower limit of the density of polyethylene (B) can be arbitrarily combined.
The density of polyethylene (A) and polyethylene (B) is preferably 900 kg/m ³ or more and 940 kg/m ³ or less, for example.

If the density of polyethylene (A) and polyethylene (B) is at least the lower limit of the above range, it will be easy to mold the fitting of this embodiment. If the density of polyethylene (A) and polyethylene (B) is below the upper limit of the above range, the fitting tool of this embodiment will be flexible and have excellent usability.

In this embodiment, the density of the resin is a value measured in accordance with JIS K7112:1999 (ISO 1183:1987).

(melting point)
The melting points of polyethylene (A) and polyethylene (B) are preferably 95°C or higher, more preferably 100°C or higher. Further, the melting points of polyethylene (A) and polyethylene (B) are preferably 140°C or lower, more preferably 135°C or lower.

The upper limit and lower limit of the melting point of polyethylene (A) can be arbitrarily combined. Further, the upper limit and lower limit of the melting point of polyethylene (B) can be arbitrarily combined.
The melting points of polyethylene (A) and polyethylene (B) are preferably 95°C or higher and 140°C or lower, for example.

When the melting points of polyethylene (A) and polyethylene (B) are equal to or higher than the lower limit of the above range, it is easy to mold the fitting of this embodiment. In addition, if the melting points of polyethylene (A) and polyethylene (B) are below the upper limit of the above range, it is easy to heat seal and manufacture a bag with a fitting when making a bag with a fitting. Become.

Note that in this embodiment, the melting point of the resin is a value measured in accordance with JIS K7121:2012 (ISO 3146).

In addition to polyethylene (A) and polyethylene (B), the resin composition (A) may contain known additives such as stabilizers, antioxidants, lubricants, antistatic agents, colorants, etc., as long as they do not impede the effects of the invention. May be added.

(First fitting part)
The first fitting portion 12 is provided on one surface 11a of the first base material 11 along the longitudinal direction. The first fitting part 12 includes a trunk 12a rising from one surface 11a of the first base material 11, and a head 12b provided at the tip of the trunk 12a. The width Wa of the trunk 12a is narrower than the width Wb of the head 12b (Wa<Wb).

The material forming the first fitting portion 12 is preferably the above-mentioned resin composition (A).

(1st seal layer)
The first sealing layer 15 is provided on the other surface 11b of the first base material 11 so as to overlap with the first base material 11.

The thickness Ta of the first seal layer 15 is preferably 0.01 mm or more, more preferably 0.02 mm or more. Further, the thickness Ta of the first seal layer 15 is preferably 0.2 mm or less, more preferably 0.1 mm or less. The upper limit and lower limit of the thickness Ta can be arbitrarily combined.

If the thickness Ta of the first sealing layer 15 is at least the lower limit value, sufficient sealing strength can be obtained when the fitting tool 1 of this embodiment is thermally welded to the bag body. If the thickness Ta of the first sealing layer 15 is equal to or less than the upper limit value, the fitting tool of this embodiment will be flexible and have excellent usability.

The width of the first seal layer 15 can be the same as that of the first base material 11.

As described above, when the resin composition (A) that is the forming material of the first base material 11 contains biomass PE, the environmental load can be reduced. On the other hand, if the first base material 11 contains a large amount of biomass PE, the sealing temperature of the first base material 11 may become high when attaching the first base material 11 to another member such as a bag. It is difficult to weld to the surface, and workability tends to decrease. If the content of biomass PE is lowered in order to lower the melting point of the first base material 11, the effect of reducing the environmental load will be lowered, making it difficult to achieve both the reduction of the environmental load and the improvement of workability. Ta.

On the other hand, in the fitting tool 1 of the present embodiment, the first base material 11 is provided with the first seal layer 15 on the other surface 11b, and the first seal layer 15 is provided with the first seal layer 15. Can be welded. Therefore, in the fitting tool 1 of this embodiment, it is possible to reduce the environmental load and improve workability.

(Resin composition (B))
The material forming the first seal layer 15 is a resin composition (B). The resin composition (B) contains at least one of a homopolymer of fossil fuel-derived ethylene and a copolymer of fossil fuel-derived ethylene and fossil fuel-derived α-olefin, that is, the above-mentioned polyethylene (B). include.

The number of polyethylenes (B) contained in the resin composition (B) may be one, or two or more.

Moreover, the resin composition (B) may also contain the above-mentioned polyethylene (A). The number of polyethylenes (B) contained in the resin composition (B) may be one, or two or more.

When the resin composition (B) contains polyethylene (A) and polyethylene (B), the content of polyethylene (B) is preferably more than 50% by mass with respect to the total amount of the resin composition (B), and 60% by mass. % or more is more preferable, and 70 mass % or more is even more preferable. Further, the content of polyethylene (B) is preferably less than 100% by mass based on the total amount of the resin composition (B).
The upper limit and lower limit of the content of polyethylene (B) in the resin composition (B) can be arbitrarily combined.

If the content of polyethylene (B) is at least the lower limit of the above range, the first seal layer 15 can ensure welding strength to another member such as a bag. If the content of polyethylene (B) is below the upper limit of the above range, the environmental load can be easily reduced.

Furthermore, the content of the copolymer in the resin composition (B) is preferably 70% by mass or more and 100% by mass or less. When the content of the copolymer in the resin composition (B) is 70% by mass or more, the sealing temperature tends to decrease and heat sealing becomes easy.

Among polyethylene (B), the resin composition (B) preferably contains a copolymer of fossil fuel-derived ethylene and fossil fuel-derived α-olefin. In the following description, the "copolymer of fossil fuel-derived ethylene and fossil fuel-derived α-olefin" may be simply referred to as "copolymer."

The MFR of the copolymer contained in the resin composition (B) is preferably 0.5 g/10 minutes or more, more preferably 1.0 g/10 minutes or more, and even more preferably 1.5 g/10 minutes or more. Further, the MFR of the copolymer contained in the resin composition (B) is preferably 15 g/10 minutes or less, more preferably 12 g/10 minutes or less, and even more preferably 10 g/10 minutes or less.

The upper limit and lower limit of MFR of the copolymer contained in the resin composition (B) can be arbitrarily combined.
The MFR of the copolymer is preferably 0.5 g/10 minutes or more and 15 g/10 minutes or less, for example.

If the MFR of the copolymer contained in the resin composition (B) is at least the lower limit of the above range, it will be easy to mold the fitting of this embodiment. If the MFR of the copolymer contained in the resin composition (B) is less than or equal to the upper limit of the above range, handling becomes easy.

The density of the copolymer contained in the resin composition (B) is preferably 850 kg/m ³ or more, more preferably 870 kg/m ³ or more. Further, the density of the copolymer contained in the resin composition (B) is preferably 920 kg/m ³ or less, more preferably 900 kg/m ³ or less.

The upper limit and lower limit of the density of the copolymer can be arbitrarily combined.
The density of the copolymer is preferably 850 kg/m ³ or more and 920 kg/m ³ or less, for example.

Moreover, in this embodiment, it is preferable that the density A of the resin composition (A) and the density B of the resin composition (B) satisfy [density A]≧[density B].

When comparing the density of the resin composition (A) and the density of the resin composition (B), each density is a theoretical value determined based on the density and content rate of the resin constituting the composition. It may also be an actual measured value. If the density of one composition is a theoretical value, the density of the other composition is also compared using the theoretical value. Similarly, if the density of one composition is a measured value, the density of the other composition is also compared using the measured value.

The density A of the resin composition (A) and the density B of the resin composition (B) satisfy [Density A]≧[Density B] to ensure welding strength to another member such as a bag body. This results in a fitting tool with excellent usability.

That is, the fitting tool 1 of this embodiment preferably has a configuration that satisfies the following requirements.
The resin composition (A) that is the material for forming the fitting 1 may contain polyethylene (B).
Polyethylene (A) and polyethylene (B) contained in the resin composition (A) both have a density of 900 kg/m ³ or more and 940 kg/m ³ or less, and a melt flow rate of 0.5 g/10 minutes or more and 15 g/10 minutes or less.
The resin composition (B) contains a copolymer of fossil fuel-derived ethylene and fossil fuel-derived α-olefin.
The copolymer has a density of 850 kg/m ³ or more and 920 kg/m ³ or less, and a melt flow rate of 0.5 g/10 minutes or more and 15 g/10 minutes or less.
Density A of the resin composition (A) and density B of the resin composition (B) satisfy [density A]≧[density B].

[Second fitting member]
The second fitting member 20 has a second base material 21 , a second fitting part 22 , and a second sealing layer 25 .

(Second base material)
The second base material 21 is a band-shaped member and supports the second fitting part 22 and the second seal layer 25.

The thickness T2 of the second base material 21 can have the same configuration as the thickness T1 of the first base material 11. The thickness T1 of the first base material 11 and the thickness T2 of the second base material 21 may be the same or different.

The width W2 of the second base material 21 can have the same configuration as the width W1 of the first base material 11. The width W1 of the first base material 11 and the width W2 of the second base material 21 may be the same or different.

The forming material of the second base material 21 may be the above-mentioned resin composition (A) or the resin composition (B). The material for forming the second base material 21 is preferably the resin composition (A) described above.

The material forming the second base material 21 may be the same as or different from the material forming the first base material 11.

(Second fitting part)
The second fitting portion 22 is provided on one surface 21a of the second base material 21 along the longitudinal direction. The second fitting part 22 includes a first arm part 22a and a second arm part 22b rising from one surface 21a of the second base material 21. The second fitting portion 22 has a recess 22c formed by a first arm portion 22a and a second arm portion 22b.

The angle θa between the first arm portion 22a and the second base material 21 is smaller than the angle θb between the second arm portion 22b and the second base material 21 (θa<θb). When the fitting tool 1 is attached to a bag, the first arm 22a of the second fitting part 22 is placed on the outside of the bag, and the second arm 22b is placed on the inside of the bag.

The width Wc of the entrance of the recessed portion 22c is narrower than the width Wb of the head 12b of the first fitting portion 12 (Wc<Wb).

The first fitting part 12 of the first fitting member 10 and the second fitting part 22 of the second fitting member 20 are such that the first fitting part 12 is a male type and the second fitting part 22 is a female type. By fitting the head 12b of the first fitting part 12 into the recess 22c of the second fitting part 22, the fitting can be detachably performed.

Specifically, when the first fitting part 12 is pressed against the second fitting part 22, the head 12b of the first fitting part 12 expands the first arm part 22a and the second arm part 22b while pushing the first arm part 22a and the second arm part 22b apart. Get into it. When the head 12b is accommodated in the recess 22c, the first arm portion 22a and the second arm portion 22b that have been pushed apart by the head 12b recover elastically and sandwich the trunk 12a. In this way, the first fitting part 12 and the second fitting part 22 fit together.

Moreover, by separating the first fitting member 10 and the second fitting member 20 from the state in which the first fitting part 12 and the second fitting part 22 are fitted, the first fitting part 12 and the second fitting part 22 are separated from each other. The head 12b of No. 12 detaches while pushing the first arm part 22a and the second arm part 22b of the second fitting part 22 apart from the inside of the recess 22c. In this way, the first fitting part 12 and the second fitting part 22 are removably fitted.

Here, the angle θa between the first arm portion 22a and the second base material 21 is smaller than the angle θb between the second arm portion 22b and the second base material 21 (θa<θb). Due to this difference in angle, the first fitting member 10 and the second fitting member 20 are separated from each other on the first arm part 22a side, and the first fitting member 10 and the second fitting member 20 are separated from each other on the second arm part 22b side. The stress required to separate both members is different from the case where the joining member 20 is separated. "Fitting strength" is the stress required to separate the first fitting member 10 and the second fitting member 20 from the state in which the first fitting part 12 and the second fitting part 22 are fitted. It is called.

The fitting strength when opening the fitting tool 1 from the first arm portion 22a side is preferably 3N or more and 40N or less, more preferably 5N or more and 30N or less.
The fitting strength when opening the fitting tool 1 from the second arm portion 22b side is preferably 30N or more, more preferably 35N or more.

In addition, the fitting strength is the amount required to separate the first fitting member 10 and the second fitting member 20 using a tensile tester using a test piece cut out from the fitting tool 1 by 50 mm in the length direction. Obtain by measuring stress. For example, the fitting strength when the fitting tool 1 is opened from the first arm part 22a side is as follows. 15 is measured by gripping the second base material 21 and the second sealing layer 25 of the second fitting member 20 on the second arm portion 22b side with the gripping portion of a tensile testing machine.

In the measurement, the sample is pulled at a tensile speed of 50 mm/min using a tensile tester to determine the maximum strength. The fitting strength is the arithmetic mean value of the measured values for five test pieces.

Note that the cross-sectional shapes of the first fitting part 12 and the second fitting part 22 shown in the figures are examples. The first fitting part 12 and the second fitting part 22 are those in which the opening of the bag body can be repeatedly opened and closed by attaching and detaching the first fitting part 12 and the second fitting part 22 to each other. Well-known cross-sectional shapes can be adopted.

The forming material of the second fitting portion 22 may be the above-mentioned resin composition (A) or the resin composition (B). The material forming the second fitting portion 22 is preferably the above-mentioned resin composition (A).

The material forming the second fitting part 22 may be the same as or different from the material forming the first fitting part 12.

(Second seal layer)
The second seal layer 25 is provided on the other surface 21b of the second base material 21 so as to overlap with the second base material 21.

The thickness Tb of the second seal layer 25 can have the same configuration as the thickness Ta of the first seal layer 15. The thickness Ta of the first seal layer 15 and the thickness Tb of the second seal layer 25 may be the same or different.

The width of the second seal layer 25 can be the same as that of the second base material 21.

The material for forming the second seal layer 25 is preferably the resin composition (B) described above. The material forming the second seal layer 25 may be the same as or different from the material forming the first seal layer 15.

(Production method)
The method for manufacturing the fitting tool 1 is not particularly limited except that the resin composition (A) and the resin composition (B) are used, and any known method can be adopted.

For example, a resin composition ( A) is obtained.

In addition, the resin composition ( B) is obtained.

The obtained resin composition (A) and resin composition (B) are introduced into a composite deformed die of the first fitting member or the second fitting member, coextruded, and cooled by water cooling or air cooling. This allows the fitting tool to be manufactured. The obtained fitting tool can be wound up using a winding machine.

In addition, the first fitting member 10 is formed by integrally extruding the first base material 11 and the first fitting part 12 using the resin composition (A), and forming the first base material of the obtained molded body. The first sealing layer 15 may be formed by thermally laminating a laminate film made of resin composition (B) on the other surface 11b of the first sealing layer 11 .

In addition, the second fitting member 20 is formed by integrally extruding the second base material 21 and the second fitting part 22 using the resin composition (A), and forming the second base material of the obtained molded body. The second sealing layer 25 may be formed by thermally laminating a laminate film made of the resin composition (B) on the other surface 21b of the second sealing layer 21 .

The fitting tool 1 as described above uses a resin composition (A) containing a biomass-derived polyethylene resin as a forming material. This reduces the amount of fossil fuel-derived resin used and reduces environmental impact.

Moreover, since the fitting tool 1 has the first sealing layer 15 on the first fitting member 10, it can be easily welded to an object such as a bag.

Furthermore, the fitting tool 1 can be used by adjusting the vegetable content of polyethylene (A) contained in the resin composition (A) or by using polyethylene (A) and polyethylene (B) together in a specific ratio. Stickiness on the surface of the fitting can be suppressed.

[Bag body with fitting tool]
FIG. 3 is a schematic front view showing the bag body 100 with a fitting device of this embodiment. In the following description, the bag body 100 with a fitting tool may be simply abbreviated as "bag body 100."

As shown in FIG. 3, the bag body 100 of this embodiment includes a bag body 50 and a fitting tool 1 attached to the inner surface of the upper part of the bag body 50.

The bag body 50 has a rectangular shape when viewed from the front. The fitting tool 1 is provided on the inner surface of the bag body 50 on the side of the upper part 50a so as to extend in the lateral direction of the bag body 50. Note that the shape of the bag body 50 is not limited to a rectangle.

The bag body 50 is sealed with contents (not shown) enclosed therein. The bag body 50 is obtained by overlapping a first film material 52 and a second film material 54 and heat-sealing all four peripheral edges 56. At the peripheral portion 56, both ends of the fitting tool 1 are heat-sealed together with the first film material 52 and the second film material 54.

The first film material 52 and the second film material 54 may be any material as long as the fitting tool 1 can be welded by heat sealing, and a laminated film having at least a sealant layer and a base material layer from the inner surface side is preferable.

Examples of the base material layer included in the laminated film include biaxially oriented nylon, biaxially oriented polypropylene, and the like.

Examples of the sealant layer included in the laminated film include linear low-density polyethylene, unstretched polypropylene, ethylene-vinyl acetate copolymer, and ionomer.

The laminated film may be provided with a functional layer such as a barrier layer.

Moreover, the first film material 52 and the second film material 54 may be single-layer films consisting only of a sealant layer.

The bag body 50 is provided with a cutting auxiliary line 58 along the fitting tool 1 closer to the upper portion 50a than the fitting tool 1.

The cutting aid line 58 is a linear portion processed to assist in cutting the bag body 50. Examples of the cutting auxiliary line 58 include weakening lines provided in the first film material 52 and the second film material 54 at the cutting auxiliary line 58 portion. The line of weakness can be formed by providing a portion of the film material that is thinner than the surrounding area. In addition, the line of weakness can also be formed by perforations or pores formed in rows.

Further, the cutting auxiliary line 58 is not limited to a weakened line, but may be a line formed by printing or the like that indicates a position to be cut with scissors, a cutter, or the like.

A notch 60 is formed at the end of the cutting auxiliary line 58 in the peripheral edge 56 . The shape of the notch 60 is not particularly limited, and a triangular or semicircular cutout can be adopted. Further, the notch 60 may be a cut provided in the peripheral portion 56.

FIG. 4 is a schematic perspective view showing the bag 100 opened. By cutting and removing the upper part of the bag body 50 from the notch 60 along the cutting auxiliary line 58, the bag 100 can have an end portion 50b that is not heat-sealed at the upper part. The bag 100 can be opened by opening the end 50b to form the opening 62.

The opening 62 formed in the bag 100 can be repeatedly opened and closed by attaching and detaching the first fitting member 10 and the second fitting member 20 of the fitting tool 1.

The bag 100 can be manufactured by a known method except for using the fitting tool 1.

Since the bag 100 of this embodiment uses the fitting tool 1, stickiness in the fitting tool arranged on the inner surface of the bag body 50 is suppressed.

Moreover, since the bag 100 of this embodiment uses the fitting tool 1, the first film material 52, the second film material 54, and the fitting tool 1 are heat-sealed together at the peripheral edge 56. When this is done, defects such as wrinkles and holes are less likely to occur at the sealed location, and a good finish is likely to be obtained.

According to the fitting tool 1 configured as described above, it is possible to reduce the environmental load.
Moreover, according to the bag body 100 with a fitting tool configured as described above, by using the above-mentioned fitting tool 1, it is possible to reduce the environmental load.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. The various shapes and combinations of the constituent members shown in the above example are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

For example, in the fitting tool 1 of the present embodiment, the first fitting member 10 has the first sealing layer 15 and the second fitting member 20 has the second sealing layer 25, but the present invention is not limited to this. First, either the first fitting member 10 or the second fitting member 20 may have a sealing layer. The effects of the present invention can be obtained by having either the first fitting member 10 or the second fitting member 20 having a sealing layer.

If a sealing layer is provided on only one of the first fitting member and the second fitting member, the fitting member provided with the sealing layer corresponds to the “first fitting member” in the present invention. do. In the present embodiment, the fitting member having the first fitting part 12 which is a male type is referred to as the "first fitting member," but only the fitting member having the second fitting part 22 which is a female type. In the case where the seal layer is provided, the invention can be understood by referring to the fitting member having the second fitting portion 22 as a “first fitting member”.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited by the following description. Note that Example 3 is a reference example.

In this example, resins listed in Table 1 below were used.

As resin E, a commercially available product manufactured by Braskem (model number SLH218) was used.

For each resin, the MFR, density, and vegetative content are the manufacturer's nominal values.
MFR is a value measured at a measurement temperature of 190° C. and a load of 2.16 kg in accordance with JIS K 7210-1.
Plant content is a value determined in accordance with ASTM D6866-11.

(Examples 1 to 4, Comparative Examples 1 to 3)
Each resin listed in Table 1 was weighed and mixed in the proportions listed in Table 2 below to prepare resin compositions (A) and (B).

The obtained resin composition (A) was melt-kneaded at 180° C. using a single-screw extruder having a diameter of 40 mm and a L/D of 25.
Further, the obtained resin composition (B) was melt-kneaded at 180° C. using a single-screw extruder having a diameter of 30 mm and a L/D of 25.

For Examples 1 to 4 and Comparative Example 2, the melted and kneaded molten resin was supplied to a composite deformed die having a die shape corresponding to the first fitting member and the second fitting member, respectively, and coextrusion molding was performed. . The obtained molded body was cooled and solidified in a water tank, and then wound up in a winding machine to obtain fittings of each example and comparative example.

The first fitting member of the obtained fitting tool has a resin amount (resin amount ) was [resin amount X]:[resin amount Y]=9:1. Regarding the second fitting member, the ratio of the amount of resin in the combination of the second fitting portion and the second base material to the amount of resin in the second sealing layer was similar to that of the first fitting member.

In the obtained fitting tool, the width of the base material (first base material, second base material) is 13 mm, the thickness of the base material is 140 μm, and the thickness of the sealing layer is as follows. It was 20 μm. Further, the combined height of the first base material and the first fitting part and the combined height of the second base material and the second fitting part were both 1.6 mm.

For Comparative Examples 1 and 3, the resin composition (A) shown in Table 2 was melt-kneaded at 180°C using an extruder with a diameter of 40 mmφ and an L/D of 25, and the first fitting member and the first fitting member were melt-kneaded. The material was supplied to a composite deformed die having a die shape corresponding to the two fitting members, and coextrusion molding was performed. The obtained molded body was cooled and solidified in a water tank, and then wound up in a winder to obtain fittings of Comparative Examples 1 and 3.

<Evaluation method>
The obtained fitting tool was evaluated by the following method.

[1. Environmental load reduction]
The reduction of environmental impact was evaluated using the following criteria.
(Evaluation criteria)
○: Environmental impact can be reduced.
×: Environmental load cannot be reduced.

[2. Stickiness evaluation]
After the fittings obtained in each example were left for 24 hours at 30°C, the surface of the fittings was touched with a hand, and stickiness was evaluated using the following criteria.
(Evaluation criteria)
○: No stickiness on the surface.
Δ: Slight stickiness is felt on the surface.
×: There is stickiness on the surface.

[3. Seal temperature]
FIG. 5 is a schematic diagram illustrating a seal temperature evaluation method.
First, from the first fitting member of the fitting tool, only the part where the first base material and the first sealing layer are laminated is cut out, and the part where the first base material and the first sealing layer are laminated is 5 mm in width and 300 mm in length. A piece of X was obtained.

On the other hand, a laminate film in which nylon (thickness: 15 μm) and LLDPE (thickness: 40 μm) were laminated was cut out to obtain a piece Y having a width of 30 mm and a length of 270 mm.

The first seal layer of the piece X cut out from the fitting tool and the LLDPE layer of the piece Y cut out from the laminate film were stacked on each other so that they faced each other. At that time, the small pieces X and Y were arranged so that their centers in the longitudinal and lateral directions coincided with each other.

A small piece At the same time, a test piece was obtained by heat sealing. In FIG. 5, the heat-sealed portion is indicated by Z. Regarding the heat-sealed portion, the width of the test piece in the transverse direction was 5 mm, and the length of the test piece in the longitudinal direction was 10 mm.

Five test pieces were prepared for each sealing temperature in which the sealing temperature of the heat-sealed portion was changed. The sealing temperatures were 115°C, 120°C, 125°C, 130°C, and 135°C. Moreover, the test pieces were produced by pressure bonding for 1 second at a pressure of 0.08 MPa at each sealing temperature.

Using a tensile testing machine (manufactured by Toyo Seiki Seisakusho Co., Ltd., VGS5E), the end X1 of the small piece X and the end Y1 of the small piece Y on one end side of the obtained test piece were grasped and the 180 degree peel strength was measured. . The peel strength was measured under conditions of a distance between chucks of 50 mm and a test speed of 500 mm/min.

Peel strength was measured for five test pieces, and the arithmetic mean value of the measured values was taken as the average peel strength.

Among the test pieces having an average peel strength of 10 N/5 mm width or more, the sealing temperature of the test piece produced at the lowest sealing temperature was determined as the "thermal sealable temperature".

The reference temperature was 130°C, and the evaluation was based on the following criteria.
(Evaluation criteria)
O: The temperature at which the laminate film can be heat-sealed is 120°C or lower.
Δ: The temperature at which the laminate film can be heat-sealed is higher than 120°C and lower than 130°C.
×: The temperature at which the laminate film can be heat-sealed is 130° C. or higher.

[4. Finish when heat sealing]
A fitting tool was placed on the LLDPE layer side of the laminate film used in the above evaluation of [sealing temperature].

Using a three-sided zipper bag making machine (manufactured by Totani Giken Kogyo Co., Ltd., model number BH-60DLSC), 100 bags with fittings were made at a heater temperature of 170°C. The sealed portion where the laminate film and the fitting tool overlapped was visually evaluated.

The obtained samples were evaluated according to the following criteria.
(Evaluation criteria)
○: The sealed portion at the evaluation location is flat, with no wrinkles, holes, or film cracks.
Δ: There are no wrinkles in the sealed portion of the evaluation location, but the fitting portions (first fitting portion, second fitting portion) of the fitting tool can be recognized as cores.
×: Either wrinkles, holes, or film cracks occur in the sealed portion of the evaluation location.

[comprehensive evaluation]
The overall evaluation was evaluated based on the following criteria. 〇 and △ were defined as good products, and × were defined as defective products.
(Evaluation criteria)
〇: Evaluation of “1. Environmental load reduction” is “〇” or “△”, and two or more of “2. Stickiness evaluation”, “3. Seal temperature”, “4. Finish during heat sealing” are “ Items with a rating of 〇.
△: The evaluation of "1. Environmental load reduction" is "〇" or "△", and one of "2. Stickiness evaluation", "3. Seal temperature", "4. Finish during heat sealing" is "〇" ” Something that has an evaluation.
×: Evaluation of “1. Environmental load reduction” is “×”.
Or even if the evaluation of "1. Environmental load reduction" is "〇" or "△", all of "2. Stickiness evaluation", "3. Seal temperature" and "4. Finish during heat sealing" are "x". Something that is an evaluation.

Table 2 shows the results of each evaluation.

As a result of the evaluation, the fitting tools of Examples 1 to 4 were able to reduce the environmental load.

Furthermore, it was found that the fittings of Examples 1 to 4 were free from stickiness and could suppress contamination of the contents of the bag with fittings.

Furthermore, it was found that the fittings of Examples 1 to 4 had low sealing temperatures and that it was easy to manufacture bags with fittings.

In addition, the fittings of Examples 1, 2, and 4 had a good finish when heat-sealed.

On the other hand, although the fitting of Comparative Example 1 could reduce the environmental load, it was sticky and it was difficult to manufacture a bag with the fitting.

The fittings of Comparative Examples 2 and 3 were unable to reduce the environmental load.

From the above results, it was found that the present invention is useful.

DESCRIPTION OF SYMBOLS 1... Fitting tool, 10... First fitting member, 11... First base material, 11a, 21a... One surface, 11b, 21b... Other surface, 12... First fitting part, 15... First seal layer, 20... second fitting member, 21... second base material, 22... second fitting part, 25... second sealing layer, 50... bag body, 100... bag body

Claims (4)

a belt-shaped first fitting member;
a band-shaped second fitting member that pairs with the first fitting member;
The first fitting member includes a band-shaped first base material,
a first fitting portion provided along the longitudinal direction of the first base material on one surface of the first base material;
a first sealing layer provided on the other surface of the first base material, overlapping with the first base material,
The second fitting member includes a band-shaped second base material;
a second fitting part provided along the longitudinal direction of the second base material on one surface of the second base material and capable of being removably fitted to the first fitting part;
a second seal layer provided on the other surface of the second base material, overlapping with the second base material;
has
The forming material of the first base material and the second base material is a resin composition (A),
The resin composition (A) is a biomass-derived polyethylene resin obtained by polymerizing a monomer containing biomass-derived ethylene, and a fossil fuel-derived polyethylene resin obtained by polymerizing a monomer containing fossil fuel-derived ethylene. Consisting of resin ,
The forming material of the first seal layer and the second seal layer is a resin composition (B),
The resin composition (B) contains at least one of a homopolymer of fossil fuel-derived ethylene and a copolymer of fossil fuel-derived ethylene and fossil fuel-derived α-olefin,
The content of the fossil fuel-derived polyethylene resin in the resin composition (A) is 30% by mass or more and 95% by mass or less based on the total amount of the resin composition (A),
The biomass-derived polyethylene resin and the fossil fuel-derived polyethylene resin both have a density of 900 kg/m ³ or more and 935 kg/m ³ or less, and a melt flow rate of 0.5 g/10 minutes or more and 15 g/10 minutes or less. and
The resin composition (B) includes the copolymer,
The copolymer has a density of 850 kg/m ³ or more and 920 kg/m ³ or less, and a melt flow rate of 0.5 g/10 minutes or more and 15 g/10 minutes or less,
A fitting tool in which the density A of the resin composition (A) and the density B of the resin composition (B) satisfy [density A]≧[density B] .
The fitting according to claim 1, wherein the content of the copolymer in the resin composition (B) is 70% by mass or more and 100% by mass or less. The fitting tool according to claim 1 or 2, wherein the biomass-derived polyethylene resin has a vegetable content of 70% or more as measured in accordance with ASTM D6866-11. The fitting tool according to any one of claims 1 to 3 ;
A bag body that accommodates the contents;
The fitting tool is a bag body with a fitting tool attached to the inner surface of the bag main body.

Images