JPH05124675A - Packaging material for various medicines - Google Patents

Abstract

PURPOSE:To obtain packaging sheet and material excellent in water resistance, gas permeability and rigidity and easy to perform a high speed filling and packaging operation. CONSTITUTION:The packaging sheet and material for use in packaging various medicines are of laminated products of a thermoplastic resin made porous membrane or nonwoven sheet A and a hole formed film or nonwoven sheet B higher in fusing point by at least 10 deg.C than the sheet A. The use of the sheet B higher in fusing point by at least 10 deg.C than the sheet A prevents the fusion of the packaging sheet at the time of its production for use on bag, etc., and the severing (edge tear) of the resulting packaging materials from a seal part 4 of the laminated sheets and eliminates the possibility of medicine leakage, being extremely effective in packaging drying agent, freshness retaining agent, deodorizing agent, oxygen removing agent, etc.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a sheet for packaging material which is excellent in water resistance, air permeability, and strength, is easy to perform high-speed filling and packaging, and can be stably produced, and a packaging sheet using the same. Regarding materials

[0002]

2. Description of the Related Art In recent years, there have been diversified demands for packaging materials such as packaging materials for various medicines and foods. For example, tensile strength, wet strength, air permeability, water resistance, tear resistance, and safety have been diversified. Request is required.

As the packaging materials used so far, for example, Japanese paper, rayon-blended synthetic fiber paper as a raw material of Japanese paper, and composite paper in which a warif is attached to Japanese paper are used, but tensile strength, wet strength, and water resistance It lacks in properties and lint (paper dust) is easily generated due to the use of Japanese paper, making it difficult to use for precision equipment and food applications. In addition, non-woven fabrics having fine pores have recently been used as a packaging material that has characteristics such as water resistance and air permeability and is preferable for packaging contents such as foods, but it is inferior in heat-sealing property and high-speed. There are problems such as difficulty in filling and packaging machines.

Further, packaging materials such as non-woven fabrics and / or perforated films are known, but there are problems such as limited air permeable parts and the possibility of spilling out very fine contents. is there.

[0005]

DISCLOSURE OF THE INVENTION The present inventor has made use of the excellent water resistance and air permeability of the nonwoven fabric previously, and has a less uneven air permeability throughout the sheet, and is capable of high-speed filling packaging. I applied for a sheet (Japanese Patent Application No. 2-184059)
No.), in this case, when a breathable sheet material with a low melting point laminated on a three-dimensional mesh nonwoven fabric is used as a packaging material such as a bag,
Melt cutting of the laminated sheet is likely to occur, and the obtained packaging material is liable to be cut (edge cut) from the sealing portion of the laminated sheet, which may lead to leakage of the drug. It is necessary to solve this point. ..

[0006]

Means for Solving the Problems As a result of various studies on the above problems, the present inventor has found that as a sheet (B) laminated on a microporous film made of a thermoplastic resin or a nonwoven fabric (A) made of a thermoplastic fiber. In order to complete the present invention, it was found that by using a sheet having a melting point difference of 10 ° C. or more higher than that of the sheet-like material (A), it is possible to provide a packaging material sheet and a packaging material from the packaging material sheet without the above problems. I arrived.

That is, the present invention is: (A) a perforated film having a high melting point difference of 10 ° C. or more between a microporous film made of a thermoplastic resin or a nonwoven fabric made of thermoplastic fibers, and (B) or a sheet (A). A sheet for packaging material for various chemicals, which is characterized by being laminated with a non-woven fabric, wherein the sheet for packaging material is laminated and the end of the sheet is sealed in a bag shape. It is a packaging material for various drugs.

The present invention will be described in detail below with reference to the drawings. A is a microporous film made of a thermoplastic resin or a nonwoven fabric made of thermoplastic fibers, which is a sheet-like material having water resistance, air permeability and strength. B is a perforated film or a non-woven fabric having a melting point difference higher than that of the sheet-shaped material A by 10 ° C. or more, and is generally a sheet-shaped material having larger air permeability than the sheet-shaped material A.

(A) The sheet A used in the present invention is not particularly limited as long as it is a raw material made of a thermoplastic resin, but for example, polyethylene, polypropylene, ethylene copolymers, propylene copolymers. Polyolefin, polyvinyl chloride, polyvinylidene chloride, etc.
Polyester, polyamide, polycarbonate and the like can be mentioned, but polyethylene and polypropylene have a relatively low melting point, are easy to process and can be preferably used.

The microporous film, which is one of the sheet-like materials A, is generally called a microporous film and is not particularly limited. For example, the pore diameter is 0.001 to 100 μm,
It is preferably 0.01 to 10 μm, has a Gurley type air permeability of 0.1 to 10,000 seconds / 100 cc, and is impermeable to water at normal pressure.

Any means can be applied to the microporous membrane as long as fine pores can be obtained. Generally, a thermoplastic resin is used as a raw material and mechanically incompletely stretched. Examples include a method of utilizing, a method of eluting after mixing solvent-soluble solid fine particles, a method of forming a thermoplastic resin mixed with an inorganic filler, and then extracting the inorganic filler. Porosification techniques are preferably used.

As the non-woven fabric which is one of the sheet-like materials A, a three-dimensional reticulated air-permeable non-woven fabric which is usually obtained by the flash spinning method is desirable.
It is generally 100 g / m ² and a thickness of 50 to 500 μm. The air permeability of the non-woven fabric is generally 1 to 500 according to Gurley type air permeability (according to JIS L-1096-B method).
Second / 100 cc, preferably 5 to 400 seconds, excellent in air permeability, and water pressure resistance (according to JIS L-1092-B method) is 500 to 5,000 mmH ₂ O, preferably 1,
It has a water resistance of 500 to 5,000 mmH ₂ O and is excellent in water resistance.

(B) Next, the sheet-like material B used in the present invention is a perforated film or non-woven fabric having a melting point difference with the sheet-like material A higher by 10 ° C. or more, and is generally more air permeable than the sheet-like material A. It is a large sheet. The sheet-like material B does not need to be a thermoplastic resin as long as the difference in melting point from the sheet-like material A is 10 ° C. or more as a material.

That is, the melting point difference from the sheet A is 10
A material that is higher than ℃ and does not melt at that temperature may be appropriately selected. The perforated film which is one of the sheet-like materials B is
The material is not particularly limited as long as it has a melting point difference of 10 ° C. or higher with respect to the sheet-like material A, and examples thereof include polyethylene, polypropylene, polyester, polyamide, polyvinyl chloride, polycarbonate, polyvinylidene chloride, and acrylic resin.

The perforated film is easily prepared by any perforation forming method. For example, various methods such as a hot iron needle contact method, a laser method, and a method of mechanically perforating with a needle cloth can be mentioned, and a hot iron needle contact method and a mechanical perforating method are preferable. The size and shape of the perforated film hole,
The hole distribution may be appropriately selected depending on the application, but for example, the hole size is 0.05 to 5 mm, preferably 0.2 to 2 m.
m, the hole pitch is preferably 3 to 30 mm.

However, if the hole diameter of the perforated film is too large, the peel strength after heat sealing tends to be reduced when the hole portion becomes a heat seal portion in forming the packaging material, and the hole diameter is too large. If it is smaller, it is difficult to obtain the desired air-permeable packaging material.

The nonwoven fabric, which is one of the sheet-shaped materials B, is not particularly limited as its material as long as the melting point difference from the sheet-shaped material A is 10 ° C. or higher, but polyethylene, polypropylene, polyamide, acrylic resin or the like is used. it can.

A typical method for producing the nonwoven fabric is, for example, a spunbond method, and a nonwoven fabric produced by this method is preferable because continuous filaments cause less fluffing. The non-woven fabric has a basis weight of 5 to 200 g.
/ M ² and a thickness of 0.05 to 1 mm are common.

(C) Lamination; Sheets A and B of the present invention
Are then laminated to form a packaging material sheet. Furthermore, by folding this sheet for packaging material, stacking it by superposing, etc., and sealing it into a bag shape, a packaging material for various drugs can be obtained. The laminating means is performed by applying a well-known adhesive, heat fusion or the like, and is not particularly limited, but for example, thermocompression bonding with a heat roll or partial softening /
A heat sealing method such as thermocompression bonding of the melted sheet A onto the sheet B, a method of thermocompression bonding between hot embossing rolls, a hot melt adhesive, a low melting point thermoplastic resin powder, ordinary adhesion Adhesive methods such as adhesives, fusion / sewing methods with ultrasonic sewing machines, adhesive methods with welders, sewing methods with sewing machines, etc. can be mentioned, and the heat sealing method using a heat roll is preferable from the viewpoint of ease of operation and the like. ..

In this case, since the melting point of the sheet-like material A (microporous film or three-dimensional mesh nonwoven fabric) is lower than that of the sheet-like material B, edge breakage at the place where the packaging material is laminated and sealed is used. It never happens.

The sheet for packaging material of the present invention is not limited to a single combination of the above-mentioned sheet-like material A and sheet-like material B, but may be a multilayer body of two or more layers of sheet-like material A and B, for example, polyethylene nonwoven fabric A + It is possible to use a multi-layered sheet-shaped product such as a polyethylene microporous film A + a polypropylene perforated film B, which is a combination of different and / or the same sheet-shaped products A and B.

With such a structure, the strength of the polyethylene microporous membrane A can be reinforced by the polyethylene nonwoven fabric A, and the air permeability can be controlled by the polypropylene perforated film B, for example. The packaging sheet of the present invention is printed on either sheet A or B, if necessary, by printing on sheet B which is usually the outer layer when it is sealed as a bag to form a packaging material. The appearance as a material can be enhanced.

(D) Production of packaging material: The packaging material sheet of the present invention is then folded in a bag shape in a timely manner according to contents such as various chemicals, laminated by stacking, etc., and sealed for packaging. Use as material. In this case, as the sealing means, the means used in the laminating step can be applied as it is, but high-speed filling (sealing) packaging is most common.

The contents in the packaging material are not particularly limited in terms of application, but for example quicklime, silica gel,
Examples thereof include desiccants such as calcium chloride, dehumidifying agent packaging materials; deoxidizing agent packaging materials such as iron powder; deodorant agents, freshness-retaining agent packaging materials and the like.

The production of the packaging material of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view showing a cross section of a packaging material according to the present invention heat-sealed in a bag shape. FIG. 2 shows A of FIG.
FIG. 7 is a partial cross-sectional view taken along the line AA, showing a heat seal part.

For example, the packaging sheet of the present invention is put in a high-speed filling and packaging machine, the contents are filled, and heat-sealed to form a bag, which is used as a packaging material. In this case, as shown in FIG. 1, the Luxer, which is the sheet-like material A, is melted and heat-sealed, and the packaging material is formed with the A layer facing inward. When the layer A alone is heat-sealed into a bag shape, the strength of the heat-sealed portion may be reduced, which may cause breakage of the sealed portion. However, when the B layer is laminated and adhered, it is effective in suppressing such breakage.

[0027]

EXAMPLES The present invention will be described below in greater detail by giving Examples, but these do not limit the scope of the present invention. .

Example 1 FIG. 3 is a schematic view showing a laminated structure of an example of a packaging material sheet according to the present invention. FIG. 4 shows A- of FIG.
FIG. 6 is a cross-sectional view taken along the line A ′, showing an enlarged laminated structure of the packaging material sheet according to the present invention.

In the pattern shown in FIGS. 3 to 4, a melting point of 170
℃, 0.5 mm hole diameter punched with a hot iron needle with a thickness of 20 μm,
Acrylic copolymer emulsion adhesive is applied to a perforated polypropylene film of 5 mm pitch, and then the melting point is 1
It was attached to a microporous membrane having a temperature of 19 ° C., a thickness of 50 μm and a basis weight of 45 g / m ² , and dried at 70 ° C. for 1 minute to obtain a laminated sheet.

[0029]

[Example 2] Instead of a microporous membrane, a three-dimensional reticulated polyethylene non-woven fabric obtained by flash spinning (trade name "Luxar" manufactured by Asahi Kasei Co., Ltd .; thickness 130 µm)
m, basis weight 40 g / m ² , Gurley type air permeability 13 seconds / 1
00cc, melting point 139 ° C.)
A laminated sheet was obtained by the same operation as above.

[0030]

COMPARATIVE EXAMPLE 1 The melting point of 141 in the pattern shown in FIGS.
The same acrylic copolymer emulsion adhesive as used in Example 1 was applied to a perforated polyethylene film having a thickness of 20 μm and a three-dimensional reticulated polyethylene nonwoven fabric obtained by flash spinning (Asahi Kasei Kogyo ( Registered trademark name “Luxar”; thickness 130 μm, basis weight 40
g / m ² , Gurley type air permeability 13 seconds / 100 cc, melting point 1
39 ° C.), and dried at 70 ° C. for 1 minute to obtain a laminated sheet.

The thus obtained three types of laminated sheets were heat-sealed into bags by using calcium chloride in a four-way sealing type high-speed filling and packaging machine. The laminated sheets of Examples 1 and 2 were good without problems of melt cutting. On the other hand, in the laminated sheet of the comparative example, there was a problem such that the laminated sheet was cut at the time of temporary stop or the like and was wound around a roll. Further, some of the obtained bags were cut (edge cut) from the seal portion, so that there was a bag in which the drug leaked.

[0032]

EFFECT OF THE INVENTION The packaging sheet of the present invention is used as a sheet-like material (B) having air permeability to be laminated on a microporous film or a non-woven fabric (A) made of a thermoplastic resin, and is combined with the sheet-like material (A). By using a material having a difference in melting point of 10 ° C. or more, melting of the packaging sheet does not occur at the time of manufacturing packaging materials such as bags, and the obtained packaging material is also cut (edge) from the seal portion of the laminated sheet. There is no risk of leakage of chemicals because of no breakage.

The packaging sheet of the present invention is water resistant,
Excellent air permeability and strength. Therefore, since the packaging sheet of the present invention has characteristics suitable for being applied to a high-speed filling and packaging machine, it is extremely effective as a packaging material for desiccants, freshness-retaining agents, deodorants, deoxidants, etc. Is.

[Brief description of drawings]

FIG. 1 is a schematic view showing a cross section of a packaging material according to the present invention heat-sealed in a bag shape.

FIG. 2 is a partial cross-sectional view taken along the line AA ′ of FIG. 1, showing a heat seal part.

FIG. 3 is a schematic diagram showing a laminated structure of an example of a packaging sheet according to the present invention.

FIG. 4 is a cross-sectional view taken along the line AA ′ in FIG. 3, showing an enlarged laminated structure of the packaging sheet according to the present invention.

[Explanation of symbols]

 1 Luxer A 2 Perforated film B 3 Contents 4 Heat seal part 5 Fold back 6 Adhesive 7 Film hole

Claims (2)

[Claims] 1. A laminate of (A) a microporous film made of a thermoplastic resin or a non-woven fabric made of thermoplastic fibers, and (B) a sheet (A) having a perforated film or non-woven fabric having a melting point difference of 10 ° C. or more. A sheet for packaging material for various chemicals, which is characterized by being formed. 2. A packaging material for various chemicals or the like, wherein the packaging material sheets are laminated and the ends of the sheets are sealed in a bag shape.