JP2001315841A - Packaging material, its manufacturing method and packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material and packaging bags of a flexible feeling, neither easily shifting the content, nor sliding a non-woven fabric during the packaging work, nor sliding the packaging material itself after packing. SOLUTION: Fabric webs containing highly frictioning composite fibers of 30 mass % or more are provided, and constituting fibers are three-dimensionally interlocked by the mechanical interlocking processing, and are heat treated at the temperature of from the melting point or higher of the first composite fibers to less the temperature of the melting point of the second composite fibers or lower, and the fibers are heat realed one another to obtain the packaging material of the static frictioning coefficient of 0.35 or more measured based on the JIST-P-8147 (the friction coefficient test method for a paper and a board). Also the packaging bag is formed by folding the packaging materials, overlapping two or more packaging materials together, or overlapping one packaging material on another sheet of different kind, and then so sealed at least a part of the packaging material sealed together as to obtain the packaging bag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a soft texture,
Sanitary napkins, panty shields, disposable diapers and other sanitary materials, gifts, disposables that do not cause the contents to slip easily or slip during the packaging operation or the package itself after packaging. Cairo, desiccant,
The present invention relates to a packaging material and a packaging bag suitable for a deodorant and the like.

[0002]

2. Description of the Related Art Conventionally, a non-woven fabric or a laminate of a non-woven fabric and a film has been used as a wrapping material.
No. 0 proposes a wrapping paper having a two-layer structure of a paper material made of a nonwoven fabric formed of a sheath-core type composite fiber and pulp,
JP-A-8-52843 proposes a packaging material in which a polyolefin-based synthetic resin film is bonded to one surface of a composite nonwoven fabric in which a paper sheet made of a spunbonded nonwoven fabric and a pulp fiber is entangled and integrated.
In Japanese Patent Application Publication No. 2002-264, there is proposed a packaging material in which a wet spunlace nonwoven fabric mainly composed of pulp fibers is laminated and laminated on a sheet body such as a nonwoven fabric. As a packaging bag, for example, Japanese Patent Publication No. 5-56912 proposes a disposable body warmer made of a spunbonded nonwoven fabric having a specified nonwoven fabric thickness and fiber volume fraction. Heat-sealing properties suitable for air-permeable packaging bags such as disposable warmers or desiccants containing a core / sheath composite fiber composed of an ester polymer such as polyethylene terephthalate / an olefin polymer such as polyethylene, etc. Nonwoven fabrics excellent in quality have been proposed.

[0003]

However, the above-mentioned packaging material has the following problems. For example, JP-A-8-
In Japanese Patent No. 52843 and Japanese Patent Application Laid-Open No. H10-156986, the three-dimensional entanglement is performed by a spunlace process, so that the texture is improved as compared with paper made of only pulp fibers, but the cornering is not eliminated. , Lacks volume and lacks luxury. Also, Japanese Patent Application Laid-Open No. Hei 7-243200, Japanese Patent Publication No. 5-56912,
In JP-A-251652, since the core-sheath type conjugate fiber or the thermoplastic continuous fiber is merely heat-bonded, the feel itself becomes hard and squaring occurs. Further, the above packaging material is
Since ordinary pulp fibers or synthetic fibers are used, the contents are easily displaced, the contents or the nonwoven fabric slips during the packaging work, or fixed in a place such as a disposable warmer or desiccant. When used, there is a problem that the package itself slides easily and cannot be fixed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a static friction coefficient measured on at least one surface of a nonwoven fabric according to JIS-P-8147 (a method for testing the coefficient of friction of paper and paperboard). Is 0.35 or more, the texture is soft and the contents are not easily displaced, or the nonwoven fabric does not slip during the packaging operation, and the package itself after packaging does not slip. It has been found that a packaging material is obtained, and the present invention has been achieved.

[0005] In the present invention, it is desirable that the constituent fibers of the nonwoven fabric are three-dimensionally entangled. Further, it is desirable that the fibers contain heat-adhesive fibers and that the fibers are heat-bonded to each other.

[0006] In the present invention, the non-woven fabric is (meth)
5 to 30 mass% of acrylate, at least one selected from acrylic acid, methacrylic acid and maleic acid
Containing 0-10 mass% of ethylene carboxylic acids of
A high friction synthetic fiber comprising at least 50% of the fiber surface with an ethylene copolymer component comprising a total of 5 to 30% by mass of an ethylene carboxylic acid monomer and 95 to 70% by mass of ethylene is used in an amount of 30% by mass or more. It is desirable to contain. Further, the high-friction synthetic fiber has an ethylene copolymer component as a first component, a thermoplastic polymer component having a melting point higher than the melting point of the first component by 20 ° C. or more as a second component, and the first component as a fiber. Desirably, the composite fiber occupies at least 50% of the surface.

In addition, the nonwoven fabric has a high friction property in which at least 50% of the fiber surface is occupied by at least one elastomer component selected from polyester-based elastomer, polyamide-based elastomer, polyurethane-based elastomer and polyolefin-based elastomer. It is desirable to contain 30 mass% or more of synthetic fibers. Further, the high-friction synthetic fiber contains an elastomer component as the first component.
Desirably, the composite fiber is a component, wherein the non-elastomeric component is the second component, and the first component occupies at least 50% of the fiber surface.

[0008] It is desirable that the nonwoven fabric is formed by melting high friction synthetic fibers and thermally bonding the constituent fibers to each other.

[0009] The packaging material of the present invention comprises a high friction synthetic fiber containing 3
It can be produced by injecting a high-speed fluid flow onto at least one surface of a fibrous web containing 0 mass% or more and three-dimensionally entangled the constituent fibers.

In the present invention, when at least a part of the non-woven fabric is subjected to a sealing treatment to form a bag-like material, the content is not easily displaced, or the content is fixed and used in a certain place. A packaging bag in which the package does not slip easily can be obtained. Hereinafter, the contents of the present invention will be specifically described.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The packaging material of the present invention is designed so that at least one surface of a nonwoven fabric has a static friction coefficient of at least 0.35 as measured by JIS-P-8147 (a method of testing friction coefficient of paper and paperboard). Is set. Examples of the nonwoven fabric that satisfies the above range include a nonwoven fabric in which fibers are bonded to each other with an adhesive having rubber elasticity such as an acrylic adhesive or a urethane adhesive, or a nonwoven fabric containing a high-friction synthetic fiber. Among them, in order to obtain a soft texture, at least 3 synthetic fibers having high friction should be used.
It is preferable to use a nonwoven fabric containing 0 mass%. A more preferred high friction synthetic fiber content is at least 50 mass
%. If the content of the high friction synthetic fiber is less than 30 mass%, the anti-slip performance is not sufficient, and a sufficient anti-slip effect cannot be obtained during use.

The high friction synthetic fibers include (meth)
5 to 30 mass% of acrylate, at least one selected from acrylic acid, methacrylic acid and maleic acid
Containing 0-10 mass% of ethylene carboxylic acids of
An ethylene-based copolymer component consisting of an ethylene carboxylic acid-based monomer having a total of 5 to 30 mass% and 95 to 70 mass% of ethylene, specifically, an ethylene-methyl acrylate copolymer and an ethylene-acrylic acid copolymer Polymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-methyl methacrylate-acrylic acid copolymer, or ethylene-vinyl acetate copolymer Examples of the component and the elastomer component include a polyester elastomer, a polyamide elastomer, a polyurethane elastomer, and a polyolefin elastomer. Among the above components, an ethylene copolymer component comprising an ethylene carboxylic acid monomer and ethylene is preferable because it has a low melting point, a large frictional resistance of the fiber itself, and an excellent nonwoven fabric processing processability. In the ethylene copolymer component, the content of the ethylene carboxylic acid monomer is 5 to 3%.
It is preferably 0 mass%. More preferably, 10
２５25 mass%. As the proportion of the ethylene carboxylic acid monomer in the copolymer component increases, the frictional resistance increases. However, when the content exceeds 30 mass%, rubber-like properties become strong and processability such as card passing property is poor. On the other hand, if the content is less than 5 mass%, the frictional resistance becomes small, and it becomes difficult to obtain a desired coefficient of static friction when formed into a nonwoven fabric.

The fiber form of the high-friction synthetic fiber is not particularly limited, and may be a single fiber, a parallel type having at least one of the above components, a sheath-core type, an eccentric sheath-core type, a split type, and a sea-island type. Any of composite fibers having a cross section such as a cross section, fibers having a modified cross section, and hollow fibers may be used. In particular, the ethylene-based copolymer component is the first component, and the thermoplastic polymer component whose melting point is higher than the melting point of the first component by 20 ° C. or more is the second component, and the first component occupies at least 50% of the fiber surface. The composite fiber obtained is preferable because it has excellent fiber manufacturing processability such as spinnability and stretchability and nonwoven fabric manufacturing processability, and can use an ethylene copolymer component as a heat bonding component. When the ethylene copolymer component is thermally bonded, the strength of the nonwoven fabric improves, but the frictional resistance tends to decrease.
It is advisable to adjust the fiber content and the thermal bonding conditions according to the purpose.

Further, an elastomer component is a first component,
A non-elastomer component as the second component, and the first component occupies at least 50% of the fiber surface as a conjugate fiber,
It is preferable because it has excellent fiber production processability such as spinnability and stretchability and nonwoven fabric production processability. Even in this case, the melting point is the first.
When a non-elastomer component higher than the melting point of the component by 20 ° C. or more is used for the second component, the elastomer component can be used as a heat bonding component. Examples of the non-elastomer component satisfying the above include polyester components such as polyethylene terephthalate and polybutylene terephthalate, polyamide components such as nylon 6 and nylon 6.6, and polyolefin components such as polypropylene and polymethylpentene. The elastomer component and the non-elastomer component are preferably a combination of homologous components because of their superior productivity.

The other materials to be mixed in the nonwoven fabric of the present invention other than the high friction synthetic fibers are not particularly limited, and natural fibers such as cotton, wool and silk, recycled fibers such as rayon and lyocell, and acrylic fibers Examples thereof include synthetic fibers such as fibers, polyester fibers, polyamide fibers, and polyolefin fibers, and functional fibers such as antibacterial fibers and deodorant fibers. For example, mixing water-absorbing fibers such as rayon or cotton with 20% by mass or more is effective in absorbing excess water and sweat. When a functional fiber such as an antibacterial fiber is mixed at 20 mass% or more, functions such as antibacterial and deodorant can be imparted. In addition to this, the fibers to be mixed can increase the bulk, improve the texture, or impart necessary functions to the site to be used, such as dyeing. Further, when the fibers to be mixed are, for example, heat-adhesive fibers having a low melting point component such as polyethylene, ethylene-propylene copolymer, and copolyester, the fibers of the constituent fibers in the nonwoven fabric can be heat-bonded to each other. A non-woven fabric with high strength is preferred because it has excellent handleability during use and processing. The fiber form of the heat-adhesive fiber may be a single fiber or a composite fiber form in which the low melting point component occupies at least 50% of the fiber surface.

Next, a preferred method for producing the packaging material of the present invention will be described. First, 30 mass of high friction synthetic fiber
% Is prepared. Examples of the form of the fibrous web include a wet-fiber papermaking web, a staple fiber web made of an air-laid web, a parallel web, a cross web, a semi-random web, a staple fiber web made of a random web, or a long fiber web made of a melt blown web or a spunbond web. The staple fiber web is preferred from the viewpoint of high-speed fluid flow processability described later. If the strength of the nonwoven fabric in the longitudinal direction is to be improved in consideration of the workability of the packaging material, a parallel web, a semi-random web, or a spunbond web may be used. Further, if necessary, the other materials may be mixed. Further, in the present invention, since it is sufficient that at least one surface has a high frictional resistance,
On one surface of the fibrous web, another sheet such as another fibrous web, a foam, a breathable film, or a non-breathable film may be laminated before and / or after the bonding method described below.

The fibrous web may be treated using a known bonding method, for example, a chemical bonding treatment, a thermal bonding treatment, a mechanical binding treatment, or the like. It is preferable in that it is originally entangled, has a soft texture, and does not have sharp edges.
Examples of the mechanical coupling treatment include a needle punch method and a high-speed fluid flow treatment method using a gas or a liquid. The high-speed water flow treatment is most effective in terms of processability and performance.
The conditions may be set according to the basis weight and texture of the packaging material to be finally obtained.
In order to obtain the packaging material of g / m ^2, the pore size of 0.05
From a nozzle having orifices of 0.5 mm provided at intervals of 0.3 to 1.5 mm, a columnar water stream having a water pressure of 1 to 5 MPa is preferably jetted from at least one side of the fiber web, preferably from each side one to four times. .

After the three-dimensional entanglement, drying is performed to remove water. At this time, the high-friction synthetic fiber in the fibrous web has the ethylene-based copolymer component as a first component, a thermoplastic polymer component having a melting point higher than the melting point of the first component by 20 ° C. or more as a second component, and a first component. A composite fiber in which the component occupies at least 50% of the fiber surface, or an elastomer component as a first component, and a non-elastomer component having a melting point higher than the melting point of the first component by 20 ° C. or more as a second component;
When the first component is a composite fiber occupying at least 50% of the fiber surface, after or simultaneously with the drying, heat treatment is performed at a temperature equal to or higher than the melting point of the first component of the composite fiber and lower than the melting point of the second component of the composite fiber. Good to do. By changing the heat treatment temperature within the above range, it is possible to adjust the friction resistance, texture, strength, and the like of the obtained packaging material. Similarly, when the heat-adhesive fiber is contained as another material, since the constituent fibers are heat-bonded by the heat-adhesive fiber after or simultaneously with the drying, heat treatment is performed at a temperature at which only the heat-adhesive fiber is melted. It is good to do. In the present invention, the processability of the packaging material is improved as the strength of the nonwoven fabric in the longitudinal direction is higher, but if the heat bonding is too much, the texture is hard and squared, so that the strength of the nonwoven fabric is 10 to 10 in the direction of higher strength. It is preferable to adjust to a range of 50N / 50mm.

The packaging material obtained in this manner is such that at least one side of the nonwoven fabric has a static friction coefficient of at least 0.35 as measured according to JIS-P-8147 (a method for testing the friction coefficient of paper and paperboard). Adjusted. A more preferred coefficient of static friction is in the range of 0.6 to 0.9. When the coefficient of static friction is less than 0.35, the contents are easily displaced, the nonwoven fabric slips during the packaging operation, the package after packing is easily slipped, and the coefficient of static friction is too large,
This is because the workability as a packaging material is not very good.

The wrapping material may be used as it is as a wrapping sheet for wrapping the object, or after folding the wrapping material, stacking two or more sheets, or stacking with another sheet, At least a portion of the packaging material may be subjected to a sealing process to form a packaging bag so that the packaging bag has a shape like a letter. Examples of the sealing treatment include a heat joining treatment (heat sealing treatment), an ultrasonic joining treatment, a high-frequency joining treatment, and the like. For example, in the case of the heat joining treatment, a high friction synthetic fiber contained in a fibrous web layer;
Alternatively, the treatment may be performed at a temperature higher than the softening point of the heat-adhesive fiber, preferably at a temperature higher than the melting point.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described with reference to embodiments. The tensile strength, elongation at break, and coefficient of static friction of the nonwoven fabric were measured by the following methods.

[Tensile strength, elongation at break] JIS-L-10
According to 96, a sample piece having a width of 5 cm and a length of 15 cm was gripped at a spacing of 10 cm, and was stretched at a tensile speed of 30 m / min using a constant-speed stretching type tensile tester. Tensile strength and breaking elongation were used.

[Coefficient of static friction] The static friction coefficient was measured using a test piece having a width of 120 mm and a length of 200 mm according to JIS-P-8147 (test method for friction coefficient of paper and paperboard).

[Examples 1 to 3] As a high friction synthetic fiber, the sheath component (first component) had a melting point of 84 ° C (JIS-K-7).
172, DSC method), modified polyolefin-based composite fiber having a fineness of 2.2 dtex and a fiber length of 45 mm made of polypropylene having a core component (second component) of melting point 165 ° C. and a fiber length of 45 mm (Daiwa Spinning Co., Ltd.) Made, brand name NB
F (XG)) was used. Then, a high friction synthetic fiber and a rayon fiber having a fineness of 1.7 dtex and a fiber length of 40 mm (manufactured by Daiwabo Rayon Co., Ltd.) were formed into a fibrous web by a semi-random card machine at a mixing ratio shown in Table 1, and a pore diameter of 0.1 mm was obtained. A nozzle having orifices provided at intervals of 0.6 mm injects a columnar water stream with a water pressure of 3 MPa twice on the front side of the fiber web and twice with a columnar water stream with a water pressure of 3 MPa on the back side to three-dimensionally convert the constituent fibers. Entangled. Next, the sheath component of the high friction synthetic fiber is melted while drying the entangled web at 85 ° C. using a hot air penetration type drier, and heat bonding is performed.
g / m ² of packaging material was obtained.

COMPARATIVE EXAMPLE 1 A commercially available polypropylene spunbond nonwoven fabric (manufactured by Mitsui Chemicals, Inc., trade name: Syntex, basis weight 30 g / m ² ) was used as a packaging material. Table 1 shows the physical properties of Examples 1 to 3 and Comparative Example 1.

[0026]

[Table 1]

The packaging materials of Examples 1 to 3 have a high coefficient of static friction and are excellent in frictional resistance. Therefore, the packaging materials do not slip during the packaging operation or the packaged product does not slip easily.
It was easy to use. The texture was also flexible. On the other hand, the packaging material of Comparative Example 1 has a low static friction coefficient,
When the contents were light, the contents easily shifted.
Further, the obtained packaging material was cut, a granular deodorant was put therein, and both sides were sealed with a heat sealing machine to complete a deodorizing bag. The sealing strength was at a practically acceptable level. And although the packaging bags of Examples 1 to 3 were not slightly moved even when slightly vibrated,
In Comparative Example 1, it was moved by light vibration, and was inferior in fixability.

[0028]

The packaging material of the present invention uses a high friction synthetic fiber and has a static friction coefficient on at least one side of a non-woven fabric within a predetermined range, so that the texture is soft and the contents easily shift. A non-woven fabric that does not slip or that does not slip during the packaging operation and that does not slip easily after packaging. When a fiber containing a specific ethylene copolymer or an elastomer component is used as the high friction synthetic fiber, and the constituent fibers are three-dimensionally entangled, it is effective because it has both anti-slip performance and soft texture. In addition, by packaging at least a part of the nonwoven fabric of the present invention to form a bag-like material, the content is not easily displaced, or when used in a fixed place, the package is used. A packaging bag that does not slip easily can be obtained. The packaging material of the present invention is suitable for packaging sanitary napkins, panty shields, sanitary materials such as disposable diapers, gifts, disposable warmers, desiccants, deodorants, and the like.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D04H 1/42 D04H 1/42 U 1/46 1/46 A 1/54 1/54 B A F term ( Reference) 3E064 BA24 BA36 BA54 BA60 BB01 BC18 BC20 EA30 FA01 FA06 GA01 HC01 HC10 3E086 AA23 AB01 AD01 BA02 BA19 BB51 BB55 CA35 DA08 4L047 AA14 AA21 AA23 AA25 AA27 AA28 AB02 BA04 BA09 BB09 CA15 CB01 CB10 CB10

Claims (10)

[Claims] At least one side of a nonwoven fabric has JI
A packaging material having a static friction coefficient of 0.35 or more as measured by SP-8147 (test method for friction coefficient of paper and paperboard). 2. The packaging material according to claim 1, wherein the constituent fibers in the nonwoven fabric are three-dimensionally entangled. 3. The non-woven fabric contains heat-adhesive fibers, and the fibers are heat-adhered to each other.
The packaging material described in. 4. The nonwoven fabric contains 5 to 30% by mass of (meth) acrylate and 0 to 10% by mass of at least one ethylene carboxylic acid selected from acrylic acid, methacrylic acid and maleic acid. The total is 5
High-friction synthetic fibers comprising at least 50% of the fiber surface by an ethylene copolymer component comprising 30% by mass of an ethylene carboxylic acid monomer and 95 to 70% by mass of ethylene contain at least 30% by mass. The packaging material according to claim 1. 5. The high-friction synthetic fiber has an ethylene copolymer component as a first component and has a melting point of 20 ° C. higher than the melting point of the first component.
The packaging material according to claim 4, wherein the high thermoplastic polymer component is a second component, and the first component is a conjugate fiber occupying at least 50% of the fiber surface. 6. A high-friction composition in which the nonwoven fabric comprises at least 50% of the fiber surface by an elastomer component comprising at least one selected from the group consisting of polyester elastomers, polyamide elastomers, polyurethane elastomers, and polyolefin elastomers. The packaging material according to any one of claims 1 to 3, comprising 30 mass% or more of fibers. 7. The high-friction synthetic fiber is a conjugate fiber comprising an elastomer component as a first component, a non-elastomer component as a second component, and the first component occupying at least 50% of the fiber surface. The packaging material according to claim 6, wherein 8. The packaging material according to claim 1, wherein the nonwoven fabric melts the high friction synthetic fiber to thermally bond the constituent fibers. 9. A method for producing a packaging material, comprising injecting a high-speed fluid flow onto at least one surface of a fibrous web containing 30% by mass or more of high friction synthetic fibers to three-dimensionally entangle constituent fibers. 10. A packaging bag, wherein at least a part of the nonwoven fabric according to claim 1 is subjected to a sealing treatment to form a bag-like material.