JPH1170994A - Storage bag for electronic device and parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict static charging which is caused by friction against a packaged item and protect the packaged item from being soiled and scratched, by the method in which a laminated sheet obtained by sticking together paper and nonwoven fabric made of a thermoplastic resin processed to have an antistatic property is heat-sealed to form a bag with the paper at the outside. SOLUTION: Nonwoven fabric 2 is produced by spinning a resin with an antistatic agent incorporated in advance. A layer of paper 1, as the outermost side, and a layer of the nonwoven fabric 2 made of a thermoplastic resin with an antistatic property, as the innermost side, are laminated with each other via a layer of adhesive between them. The laminated sheet is cut according to the size of an item to be packaged, and formed as a bag by heat-sealing the nonwoven fabric 2, turning its face inward. Thus, static charging which is caused by friction between the bag and its contents is restricted, and by the cushioning effect of the nonwoven fabric 2 the packaged item is protected from being soiled and scratched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag for storing electronic devices and electronic components (hereinafter referred to as "electronic devices"). For example, notebook personal computer body, C
The present invention relates to a D (compact disk) player, audio equipment, and the like, and a storage bag for semi-finished products and components thereof.

[0002]

2. Description of the Related Art Electronic devices such as personal computers and word processors are:
In order to safely protect the product from the external environment before it is shipped from the factory and reaches the user, it is stored and transported in a cardboard box or the like. Usually, the above electronic devices are housed in a bag (LDPE bag) in which a low-density polyethylene (LDPE) film is heat-sealed, and the periphery thereof is surrounded by a cushioning material, for example, a resin foam, and furthermore, a corrugated cardboard having a sufficient internal volume It is packed in an outer box made of steel.

[0003] However, although the LDPE bag can protect the electronic equipment as the package from dirt and abrasion, etc., the electrostatic charge due to the friction between the packaging material and the package, the friction between the adjacent packaging materials. However, there is a problem in preventing troubles caused by electrostatic charging due to the above-mentioned factors. To cope with such a problem, an antistatic agent applied to the surface of an LDPE bag or the like has been used. However, in a portion where the bag and the object to be packaged are in close contact, the antistatic agent is applied to the object to be packaged. There was a problem of sticking. In addition, in a method in which an antistatic agent is kneaded and mixed with a resin, an antistatic effect may not be easily exhibited unless a large amount is added.

In addition, a bag in which aluminum is deposited on the surface of a multilayer film of a thermoplastic resin or a bag in which a conductive material (Ketjen black or the like) is kneaded with a thermoplastic resin are also used. In addition, it is not suitable for this use, and it is difficult to dispose of it because a plurality of resins and metals are used.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of producing a static electricity due to friction between a packaging material (inner surface) and an object to be packaged, friction between adjacent storage bags, and friction between a packaging material (outer surface) and a cushioning material. Provided is a storage bag for electronic devices, which can protect the electronic devices to be packaged from dirt and abrasion, etc. by suppressing the electrification and the buffer effect of the nonwoven fabric, and can be easily disposed of after use. Is to do.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that the above-mentioned object can be achieved by using a bag for storing electronic devices having a specific configuration.
The present invention has been made based on such findings. That is, the present invention relates to (1) an electronic device in which a laminated sheet obtained by laminating a paper and a non-woven fabric made of an antistatic thermoplastic resin is heat-sealed in a bag shape with the paper as the outer surface and the thermoplastic resin non-woven fabric as the inner surface. Storage bag for equipment and electronic components. (2) The surface resistivity of the surface of the nonwoven fabric is 1.0 × 10 ¹¹ Ω
The present invention provides the following electronic device / electronic component storage bag of (1).

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. 1. Laminated Sheet The laminated sheet constituting the electronic device storage bag according to the present invention is a sheet in which paper and a nonwoven fabric made of an antistatic thermoplastic resin are applied.

The thickness of the laminated sheet and the thickness ratio between the paper layer and the thermoplastic resin nonwoven fabric layer are not particularly limited, but may be suitably adjusted according to the required characteristics required for the electronic equipment storage bag of the present invention. For example, if more cushioning properties are required in addition to antistatic properties, dirt and scratch resistance, consider increasing the thickness of the thermoplastic resin non-woven fabric layer and consider not damaging the incinerator during incineration. In this case, the thickness of the paper layer may be increased. (1) Antistatically processed thermoplastic nonwoven fabric layer The nonwoven fabric forming the electronic device storage bag according to the present invention is not particularly limited as long as it is a nonwoven fabric using a heat-sealable thermoplastic resin. Various nonwoven fabrics manufactured by the method described above are used.

For example, as fibers constituting the nonwoven fabric, polypropylene, polyethylene (LDPE, LLD)
PE, HDPE), polyethylene terephthalate, nylon, and composite fibers thereof, for example, a composite fiber in which the fiber sheath is made of polyethylene and a fiber core is made of polypropylene or nylon, or a fiber in which polyethylene and polyethylene terephthalate are composited in a side-by-side type is preferably used. . Among them, polypropylene is more preferably used.

Although there is no particular limitation on the method for producing the nonwoven fabric,
In consideration of the cushioning property of the nonwoven fabric, it is preferable to appropriately select a method that can provide flexibility and bulkiness. Specifically, it can be manufactured by a known method such as spunbond, spunlace, hot air card, hot embossed card, needle punch method, melt blow, etc. Among them, among others, cushioning, moderate bulkiness, strength and the like are balanced. From the viewpoint, the following production method is preferably used.

The spunbond method is preferable because it can be manufactured in one step in addition to the above advantages, and the spunlace method and the hot air card method are also preferable. The basis weight of the nonwoven fabric is not particularly limited, but is 15 to 100 g / m ² , preferably 20 g / m ² .
６０60 g / m ² . If it exceeds 100 g / m ² , the nonwoven fabric portion increases, the efficiency of bag making by heat sealing decreases, the antistatic processing becomes difficult, and the cost increases. When it is less than 15 g / m ² , the strength of the bag is low, the bag may be damaged during handling or by rubbing with the packaged object, and the cushioning effect is difficult to expect, so that the bag is likely to be damaged.

The thermoplastic nonwoven fabric subjected to antistatic treatment used in the present invention is obtained by subjecting the above nonwoven fabric to antistatic treatment by a known method. Post-processing methods include anti-static processing methods,
A method of producing a nonwoven fabric by spinning a resin in which an antistatic agent or a conductive substance (such as an organic conductive agent) has been kneaded in advance. As an example of the former, there is a method of applying a gravure roll coating, a spray coating pyrolysis, and an impregnation coating to a nonwoven fabric with a surfactant having an antistatic property.

Considering the prevention of deterioration of the antistatic performance due to the rubbing of the non-woven fabric on the inner surface of the bag and the packaged object, the prevention of adhesion to the packaged item and the economical efficiency, a resin mixed with an antistatic agent in advance is spun. A method for producing a nonwoven fabric is preferred. However, even in the post-processing method, in the case where it is not necessary to worry about durability for short-distance transportation, if a surfactant capable of exhibiting sufficient antistatic performance with a small amount of application is selected, there is no fear of adhesion. In short, in the use environment, the surface of the non-woven fabric on the inner surface of the bag only needs to exhibit antistatic properties and not cause problems such as adhesion to the packaged object.

The antistatic agent is not particularly limited, and known ones can be used. For example, primary amine salts, tertiary amines, cationic surfactants such as quaternary ammonium compounds and pyridine derivatives, anionic surfactants such as fatty alcohol sulfates, alkyl sulfates and fatty acid ethyl sulfonates, Nonionic activators such as ethylene oxide adducts of fatty alcohols, ethylene oxide adducts of fatty acids and ethylene oxide adducts of fatty amino or fatty acid amides, carboxylic acid derivatives (petaine form)
And amphoteric activators such as hydroxyethylimidazoline sulfate and high molecular weight antistatic agents such as high molecular weight polyethylene oxide.

In the present invention, a preferable standard of antistatic property is:
The surface specific resistance of the nonwoven fabric is less than 1.0 × 10 ¹³ Ω, preferably 1.0 × 10 ¹² Ω or less at 23 ° C. and 50% relative humidity;
More preferably, it is 1.0 × 10 ¹¹ Ω or less, and the friction band voltage of the nonwoven fabric is 1500 V or less, preferably 1000 V or less, more preferably 500 V at 23 ° C. and 50% relative humidity.
V or less.

When the surface specific resistance value is 1.0 × 10 ¹³ Ω or more and / or the frictional band voltage is 1500 V or more, static charge due to friction or the like, and dust in the air adheres to the package due to the static charge. There is a high possibility that the packaged product cannot be sufficiently protected from the generated scratches, dirt, and the like. (2) Paper layer There is no particular limitation, for example, known paper made of plant fibers such as pulp, cellulose, mitsumata, mulberry, recycled paper and rayon, cellulose acetate, synthetic fiber,
Known synthetic papers made of polypropylene and polyethylene may be used.

In general, kraft paper, pure white roll paper, and mixed paper of pulp and rayon are preferred, and among them, mixed paper of pulp and rayon is particularly preferable because of its moderate stiffness and ease of packing. The mixing ratio of pulp and rayon is not particularly limited, but is preferably pulp / rayon = 1/9 by weight.
To 9/1, particularly preferably 3/7 to 7/3. Basis weight is preferably those of 10 to 100 g / m ^2, more preferably from 20 to 50 g / m ^2.

If the basis weight is less than 10 g / m ² , it is likely to be rubbed during transportation, damaged during handling and bag making, and if it is greater than 100 g / m ² , the flexibility of the bag will be impaired and the handling will be poor. Sometimes wrinkles are left and the appearance is impaired. The basis weight is a general guideline, if there is a strength at low basis weight, to would no practical problem even less than 10 g / m ^2, even beyond 100 g / m ² if a flexible material, the flexible bag The problem of wrinkles and wrinkles may not be a problem in practical use.

In general, when the basis weight of paper is large, the strength becomes higher than when low-weight paper is used. Therefore, the weight of the non-woven fabric made of thermoplastic resin, which has a problem in disposal, can be reduced by that much, and the amount of paper used during incineration can be reduced. There is an advantage that calorific value can be reduced. If the problems of bag flexibility, wrinkles, and high price are practically acceptable, it is preferable that the weight ratio (paper / film) between paper and the thermoplastic resin nonwoven fabric is large.

The paper may optionally contain various additives such as an antistatic agent and a lubricant which can be used for the thermoplastic resin nonwoven fabric. (3) Lamination Method The electronic equipment storage bag according to the present invention is a bag made of a sheet in which the paper and the thermoplastic resin nonwoven fabric are laminated.

The method of laminating the sheet may be a known method, such as extrusion lamination, dry lamination, or lamination using a hot melt adhesive. In particular, extrusion lamination is preferred from the viewpoint of high production and low cost. preferable. Adhesive layer between paper and thermoplastic non-woven fabric, usually hot melt adhesive (ethylene vinyl alcohol, ethylene ethyl acrylate, ethylene methyl methacrylate), low density polyethylene, linear low density polyethylene, ethylene vinyl alcohol film Layer (extrusion lamination method), a solvent system for dry lamination, and an emulsion adhesive.

The amount of adhesive used is preferably as small as possible in order to reduce the amount of thermoplastic resin used. Generally, 5 to 30 g / m ² , more preferably 10 to ²⁰ g / m ^2
2 It is preferable that the adhesive layer forms a uniform film on the entire surface and makes the nonwoven fabric and the paper adhere to each other, rather than the partial coating, because waterproofness can be obtained by the uniform film.

As long as the adhesive performance is not impaired more than necessary,
You may mix | blend an antistatic agent. The antistatic effect of the nonwoven fabric and the adhesive layer contributes to the prevention of triboelectric charging of the paper surface. 2. Storage bag for electronic devices and electronic components (1) Embodiment in which the laminated sheet is formed into a bag When heat-sealing into a bag, the outermost surface is a paper layer, and the innermost surface is an antistatic thermoplastic resin nonwoven fabric layer. I just want it. It is preferable that there is nothing between the paper layer and the thermoplastic resin nonwoven fabric layer other than the adhesive layer.

Here, the outermost surface is a paper layer as long as the outermost surface is substantially a paper layer. For example, even when a thin protective film is stuck on the paper surface, the outermost surface is included in the paper layer. It is. (2) Bag-making method The bag is cut in accordance with the dimensions of the packaged object, and heat-sealed into a bag-like shape by a conventionally known method with the nonwoven fabric surface inside, or cut into a bag-like shape after heat sealing.

Specific examples include a hot plate seal, an impulse seal, an ultrasonic seal, and a high frequency welder bag making method. From the viewpoint of production speed, it is preferable to use a bag making machine using a hot plate seal.

[0026]

【Example】

Example 1 Polypropylene spunbond nonwoven fabric (RN2020E manufactured by Idemitsu Petrochemical) 20 g / m ^{2 provided} with antistatic property and mixed paper (pulp / rayon = 1/1: weight ratio, manufactured by Inoue Paper) 3
Using a T-die extruder, 0 g / m ² of 18 μm low-density polyethylene (Petrocene 212 manufactured by Tosoh Corporation) was used to obtain a laminated sheet. Using the laminated sheet, 3
The three sides of 0 cm × 30 cm were heat-sealed with a hot plate sealing machine to obtain the bag of FIG.

The specific resistance of the surface of the nonwoven fabric (the inner surface of the bag) is determined by JIS.
When measured by the K6911 method (23 ° C-50% RH), 1.2 × 10
^10. The frictional voltage of the non-woven fabric surface is JIS L1094B method (23 ℃ -50% R
H), and the average was 350 V (minimum 280 V, maximum 450 V). Comparative Example 1 A bag was produced in the same manner as in Example 1, except that 20 g / m ² of a polypropylene spunbond nonwoven fabric (Idemitsu Petrochemical, RN2020) having no antistatic property was used.

The surface specific resistance of the nonwoven fabric surface was measured by JIS K6911 method to be 2.0 × 10 ¹⁶ Ω or more, and the frictional charged voltage of the nonwoven fabric surface was JIS L1094B method (23 ° C.-50% RH), averaged 2600
V (minimum 1500 V, maximum 4200 V).

[0029]

According to the present invention, since the inner surface of the bag is made of a thermoplastic non-woven fabric which has been subjected to antistatic treatment, the electrostatic charge due to friction with the packaged object is suppressed, and the buffer effect of the non-woven fabric causes dirt and scratches. It is possible to protect the electronic device which is the packaged object from the above. Further, since the outer surface of the bag is paper, generation of static electricity due to friction between an external article (adjacent storage bag, cushioning material, etc.) and the outer surface of the bag can be suppressed.

In addition to the above advantages, the calorific value during incineration can be reduced by combining with paper.

[Brief description of the drawings]

FIG. 1 is an example of a storage bag for electronic devices and electronic components of the present invention.

FIG. 2 is a cross-sectional view of a laminated sheet forming a storage bag (A → FIG. 1);
← A ^, Enlarged view of ^the part)

[Explanation of symbols]

1: paper 2: non-woven fabric 3: heat-sealed part 4: A → ← A ^, cross section of ^the laminated sheet (A is the innermost surface of the bag, A ^, is the outermost layer of the bag)

Claims (2)

[Claims] 1. An electronic device or electronic component obtained by heat-sealing a laminated sheet obtained by laminating a paper and a non-woven fabric made of an antistatic thermoplastic resin into a bag with the paper as an outer surface and the non-woven fabric made of a thermoplastic resin as an inner surface. Storage bag. 2. The storage bag according to claim 1, wherein the surface resistivity of the surface of the thermoplastic resin nonwoven fabric is 1.0 × 10 ¹¹ Ω or less.