JPS6311106Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a conductive buffer bag.
More specifically, the present invention relates to a buffer bag made of a material that has antistatic properties and is particularly suitable for storing precision light electrical parts such as integrated circuit (IC) elements.

In recent years, the production of semiconductor parts such as integrated circuit elements has increased, and the demand for packaging materials suitable for them has also risen. Semiconductor parts, especially MOS type integrated circuit elements, have a metal oxide coating that is about 500 Å thick, so the circuits are easily destroyed by static electricity. Therefore, the packaging bags for these parts are:
It is necessary to have sufficient cushioning performance, and also to prevent static electricity build-up due to contact and friction between the parts and the bag or between the bag itself.

Conventionally, bags have been manufactured by heat-sealing thermoplastic resin inflation films, and bags have been manufactured by laminating flat resin film materials on one or both sides of a core material made of thermoplastic resin film with textured edges. Bags made of materials with independent air chambers are used, but the surface resistivity of these bags is
Since it has a high resistance of 10 ¹⁸ to 10 ¹⁰ Ω and constitutes an electrical insulator, static electricity is likely to accumulate, making it unsuitable as a bag for storing components that are sensitive to static electricity.

As a countermeasure against this problem, some packaging bags are made of thermoplastic resin materials containing antistatic agents and good electrical conductors such as carbon black. Since it is blended into the entire material, the cost of the material increases significantly, and there is also the disadvantage that a large amount of material is lost when changing types during the manufacturing process of the bag.

In addition, when bags were made only from opaque film made of thermoplastic resin mixed with carbon black, etc., although they had antistatic properties, they also had the disadvantage that the contents of the bag could not be seen from the outside.

The present invention relates to a novel conductive buffer bag that eliminates these drawbacks.

In other words, the conductive buffer bag of the present invention is a buffer bag in which a flat thermoplastic resin film is laminated on one or both sides of a core material made of a thermoplastic resin film with a textured surface to form a large number of independent air chambers. Of the two inner layers in contact with the contents of the buffer bag made of material, at least one inner layer is made of raw resin 100%
It is characterized by being made of a material that has antistatic properties and contains 10 to 30 parts by weight of carbon black.

The present invention will be explained in more detail below with reference to illustrated embodiments.

The buffer bag 1 of the present invention shown in FIG. 1 has various layer configurations as shown in FIGS. 2A to 2F. A core material 2 made of a thermoplastic resin film is textured, and a large number of independent air chambers 4 are formed by adhering a thermoplastic resin film material 3 to the core material 2 . The planar shape of the independent air chamber 4 is usually circular, but is not particularly limited to this. If this layer of core material 2 is placed inside the bag 1 (for example, FIG. 2A), the contents of the bag 1 will be difficult to move, and the contents will remain stable within the bag during transportation. Further, if the core material 2 layer is placed on the outside (for example, as shown in FIG. 2C), it becomes easier to take the contents into and out of the bag 1. Furthermore, as shown in FIGS. 2D to F, if one side or both sides of the bag are made of three layers, the bag will have a stronger elasticity and will be easier to handle.

In the present invention, the constituent materials of the buffer bag 1 having the above-mentioned structure are specified. That is,
At least one layer of the inner layer 5 of the core material 2 or the film material 3 that contacts the contents is formed of a film material having antistatic properties.

Film materials with antistatic properties include:
A thermoplastic resin to which carbon black is added is preferable in terms of material processability, versatility, low cost, electrical conductivity, etc., and can have a surface resistivity of 10 ⁶ Ω or less. However, since the film material becomes opaque, the contents cannot be seen from outside the bag. This will be referred to as "conductive material A" below.

As the conductive material A, for example, polyethylene,
When blending carbon black with polyolefin resin such as polypropylene, raw resin 100%
Carbon black is usually 10 to 30 parts by weight.
Preferably, it is expressed in parts by weight. If the amount of carbon black is less than 10 parts by weight, conductivity will be insufficient and good antistatic performance will not be obtained. Furthermore, even if the amount of carbon black added is greater than 30 parts by weight, the conductivity effect will not be further improved, and pinholes will occur during inflation and heat sealing will be defective. This is not preferable because of the following disadvantages.

In addition to the above, examples of materials with antistatic properties include materials made of thermoplastic resin mixed with an antistatic agent;
There are materials such as a thermoplastic resin film coated with an antistatic agent (hereinafter referred to as "conductive material B"), which have transparency, but have a higher surface resistivity than the conductive material A. 10 ¹⁰ ~ 10 ⁶ Ω
That's about it.

Examples of antistatic agents include cationic quaternary ammonium salts and imidazoline derivatives; anionic alkyl sulfates, alkylaryl sulfates, and alkyl sulfonates; nonionic polyoxyethylene alkylamines and glycerin fatty acid esters; and amphoteric There are various types of surfactants such as alkyl betaines, among which polyoxyethylene alkylamines and glycerin fatty acid esters are preferred.

In the present invention, among the layers constituting the bag 1, the conductive material A is used as the inner layer 5 that contacts the contents of the bag. Furthermore, it goes without saying that conductive materials can be appropriately used for the core material 2 and the film material 3 other than the inner layer 5 which is provided with conductivity.

According to the test results of the present inventors, even in cases where high antistatic performance is required, such as bags for integrated circuit devices, it is not necessary to make all of the inner and outer layers of the bag from conductive materials. The conductive material A having a surface resistivity of 10 ⁶ to 10 ⁰ Ω is applied to the inner layer 5 in contact with the terminals, etc.
Good results can be obtained by using the inner layer 5.
It has also been found that even better results can be obtained by using the conductive material A or B.

In another embodiment of the invention, at least 50% of the area of the inner layer of the buffer bag is made of an opaque material.
For example, it is made of the conductive material A, and the other parts are made of a transparent material. In that case, the entire surface of the inner layer on one side may be made of an opaque material, and the inner layer on the other side may be made of a transparent material. , striped pattern, striped pattern, polka dot pattern, plaid pattern,
By forming the opaque portion in any other arbitrary arrangement, it is possible to impart electrical conductivity to the buffer bag, as well as impart design properties and increase added value. Examples of the transparent material include ordinary thermoplastic resin films such as polyolefin films and the above-mentioned conductive material B.
There are transparent materials that contain surfactants, etc.
Furthermore, in the present invention, transparent refers to a state in which the presence of the contents can be confirmed from the outside of the bag.

By doing as described above, it is possible to impart antistatic properties to the buffer bag, and at the same time, it becomes possible to easily check the contents of the bag, which is suitable for handling the package.

The buffer bag of the present invention as described above can protect the contents from external shocks and is difficult to accumulate static electricity, so the contents will not be damaged by static electricity discharge, and furthermore, the contents can be protected from external shocks. It has the advantage that it can be seen from the outside, and is also characterized by lower manufacturing costs than conventional bags with antistatic properties.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the buffer bag of the present invention, and FIGS. 2A to 2 F are enlarged longitudinal sectional views taken along the line - in FIG. 1, showing the layer structure of the buffer bag. 1... Buffer bag, 2... Core material, 3... Film material, 4... Independent air chamber, 5... Inner layer.

Claims (1)

[Claims for Utility Model Registration] (1) A buffer in which a flat thermoplastic resin film is laminated to one or both sides of a core material made of a thermoplastic resin film with a textured surface to form a large number of independent air chambers. The inner layer on at least one side of the two inner layers in contact with the contents of the buffer bag made of the material is antistatic, containing 10 to 30 parts by weight of carbon black per 100 parts by weight of the raw resin. A conductive buffer bag characterized by being made of a material with high performance. (2) The utility model registered in claim 1, characterized in that any film material and core material other than the inner layer having antistatic properties of the buffer bag are formed of materials having antistatic properties. Conductive buffer bag as described. (3) The inner layer on one side of the buffer bag is made of a material with antistatic properties made of a thermoplastic resin and carbon black, and at least the inner layer on the other side is made of a thermoplastic resin and a surfactant-based antistatic material. The conductive buffer bag according to claim 1 or 2, which is made of a material having antistatic properties and containing an antistatic agent.