JPS5887049A - Plastic group packing material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to packaging materials, and more particularly to plastic yarn packaging materials for packaging articles adversely affected by phlegm.

In the past, instead of ordinary goods9, semiconductor cables, precision parts,
Films or sorts made by Tanyu Nolastic were also used to package explosives. However, glass-based films are easily charged with electricity due to friction, etc.;
It is not preferable because it causes adverse effects such as changes in physical properties due to the shelf life of the packaged goods.

Several methods have been used to completely prevent such static buildup on plastics. The first method involves adding an antistatic agent to the plastic powder. This method is simple and economical, but since the antistatic agent exhibits its effect depending on the ridges transferred to the surface of the plastic and the presence of moisture, it is not affected by changes in temperature or humidity. has the disadvantage that the effect is not stable. Also, due to the bleed phenomenon, young fruits do not persist.

The second method involves blending a 4-force inorganic material such as a carbon blank with a plastic such as a polyolefin. According to this method, the antistatic effect is improved and the antistatic effect is also made permanent, but since it is easy to conduct the charge from the first part, it still has an adverse effect on semiconductor devices and the like.

A third method is to completely coat or vapor deposit metal on the inner surface of the plastic film. According to this method, no charging phenomenon occurs, but the film obtained is inconvenient to use because it does not have heatsol properties, and its production requires expensive equipment and is not economical.

The present invention was made against the background of the above-mentioned circumstances, and its overall purpose is to provide a plastic packaging material that has a relatively simple structure and is capable of preventing adverse effects caused by electrostatic charge on packaged articles. do.

According to this invention, the 4g packaging material for packaging articles that are adversely affected by static electricity is made of a laminate of a plurality of plastic thread films, and the innermost dove film that is in contact with the article has a low volume resistivity and total Furthermore, a packaging material is provided in which the outermost layer film exhibits low surface electrical resistance.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The JO has a two-layer structure including an inner film 1 and an outer film 12 which are to be in contact with an article (not shown). Inner Ishi II
Film 11 exhibits low volume resistivity, while outer film 12 exhibits low surface resistivity gold. Films with low volume resistivity are plastics, conductive materials, such as conductive carbon black, graphite, short edge fiber, graphite graphite, tetrathiafulvalene-tetrananomethane complex. , donor or accessor fully doped polyacetylene, polyphenylene sulfide, polythiazole, etc. are preferred.
: It can be formed from a compound blended at a ratio of % or less. This film is one that conducts static electricity (semi-conductive) and has a volume resistivity of 10° to 10Ω, preferably 1
A sieve of 0 to 10 Ω is preferable. The amount of the conductive material to be blended can be appropriately selected depending on the volume resistivity value.

Outer film 126″i laminated on inner film 1
It can be obtained by molding plastic into a film and then coating and spraying an antistatic agent on the surface thereof, or by kneading and blending an antistatic agent into plastic and molding this mixture. All known antistatic agents that are compatible with plastics can be used.

Examples include granicine conductors, phosphate-containing anionic activators, anionic activators such as sulfonic acids, quaternary ammonium salts, pyridinium salts, imidacillin derivatives,
These are morpholine derivatives, polyethylene glycol-based nonionic surfactants such as polyoxy/ethylene-alkylphenols and alkylamide ethers, and yuzu surfactants such as sorbitan fatty acid esters. Fatty acid amides and aliphatic amines can also be used in combination. The outer 1111j film 12 does not allow static electricity to pass across its length (therefore, it does not allow static electricity generated outside to pass through to the inner 9111 film 1), but it has a low surface electrical resistance on its surface to prevent charging. have. When the inhibitor is kneaded into plastic, it migrates to the surface (plumping effect) and exerts its full effect. In this case, the amount of @antistatic agent added is usually 0.005 to 05%.

6- In addition, if this packaging material is stored for a long period of time, exposed to high temperatures, or if the amount of @ichi 1 inhibitor added to the outer film 12 is large, the antistatic agent may also migrate to the inner film J1. , the amount of antistatic agent in the outer film A 12 may be reduced and the antistatic effect may be reduced. In order to prevent this, it is preferable to add an antistatic agent to the inner film J1 at a rate of kloo to 2000 ppm by weight.

The sheet-like packaging material 20 shown in FIG. 2 is similar to the packaging material 10 shown in FIG. 1 except that an intermediate film 21 is provided between the inner film I and the outer film 12. The interlayer film 211d exhibits a high volume resistivity and therefore can be made solely of plastic.

As the plastic used to form the entire packaging material of this invention, any plastic that has been conventionally used as a packaging material can be used. Here are some examples: polyvinyl chloride, polyvinyl chloride, vinyl chloride thread plastics such as vinyl chloride-vinyl acetate copolymer, polyethylene, polypropylene, ethylene-propylene copolymer, polybutene, ethylene-vinyl acetate copolymer Polyoleate A thread plastic, nylon 6, nylon 6 etc.
゜6, polyamide ゜ yarn plus q- such as nylon 6.10
y, s=IJ Styrene-based plastics such as styrene and styrene-acrylonitrile copolymer, polyester-based plastics such as polyethylene terephthalate, and polyethylene terephthalate. Among these, polyolefin thread plastic is most preferred.

The polar layer film constituting the packaging material of the present invention can be produced by molding each film separately and laminating them together, or by coextrusion, but the latter method is preferred. This coextrusion method is well known and when producing the packaging material of the invention, for example consisting of a two-layer film, by this method:
The plastic material for the inner film and the plastic material for the outer film are fed from separate extrusions into one gouge and integrated within or outside the gouge. in this case,
According to the inflation method, a tubular film is obtained.

As shown with a partial cutout in FIG.
A bag-shaped packaging material 30 is obtained by sealing by total heat fusion or the like. By packaging the semiconductor element 32 in this packaging material 30 with its external terminals (not shown) stuck against, for example, the foamed polyurethane plate 31, the semiconductor element can be protected from the adverse effects of charging.

Note that the viscosity of Silastic containing a relatively large amount of conductive material increases, the mechanical strength decreases, and it is relatively difficult to form it into a film as it is. However, by using the above-mentioned coextrusion molding method and keeping the internal pressure of the molding rod as low as possible, a stable film can be obtained.

Its formability and strength are determined by This is because it is compensated by Lum.

The packaging material of the present invention is made electrically conductive by having a low overall volume resistance of the innermost layer film that is in contact with the article, and eliminates static air and air that may cause electricity to pass through from the outside. provides low surface resistance. Therefore, charging and static electricity are prevented from being generated as a whole, and no external charges are allowed to pass through. In this way, the packaging material of the present invention can be used to package semiconductor devices (including ICs, LSIs, etc.)
, Explosives and other items that are susceptible to negative effects due to static electricity can be safely wrapped and packaged.

Is there any particular limit to the thickness of each film?
It is μm to 150 μm. In addition, a coloring agent can be added to the outermost layer film to give it a desired color, or an appropriate print can be applied to the surface. It can also be made by In this case, the amount of the conductive material added is sufficient to not reduce the volume resistivity of the film so much and to prevent charging on the surface.

Examples of this invention will be described below.

Examples 1 to 3 High-pressure polyethylene with a melt-in-axe of 2 gr/10 minutes and a density of 0.925 gr/cc was used as the plastic. The conductive film is made of commercially available 4
■Strength - Bone black 30% by weight compound kneaded with total dispersant (melt index 0.24 gr/10
2000 ppmi of a commercially available polyoxyethylene alkylamine surfactant to the above polyethylene.
Kneaded formulation (melt index 2 gr/10
minute, density 0.924gr/cc). Further, a film containing an antistatic agent and a conductive material was prepared from the above-mentioned polyethylene blended in the above-mentioned proportions.

Laminated films having the configurations shown in Table 1 were prepared from these plastic materials by coextrusion molding.

Table 1 *) or (each fee is equally divided into 6 'i i
5r was measured using JISB 7509 (0,001 mm scale diamond/l/)f-no).

The electrical and mechanical properties of the packaging material thus obtained were measured as shown in Table 2VC. The results are summarized in Figure 2.

13- Note: Specific resistance of the Q-attached surface: I used a 'VMG-1000 type super insulation resistance tester manufactured by Ando Electric Co., Ltd. All electrodes were 5E-1000 type, and the applied voltage was 10.
0OV, 1 minute measurement.

Measured using 0 volume resistivity 3201 manufactured by Yokogawa Ichiki Co., Ltd., with a probe spacing of 10 mm.

0 peak voltage [1] 5TATICHONEST MET manufactured by Tsudo Shokai Co., Ltd.
Using ER, the applied voltage is 10000 V for 1 minute? Measured as electrostatic disciano.

0 decay time Measure the time when the peak voltage decays from 0 to zero using a chart recorder.

0 tensile strength Measured according to JIS Z1702.

0 degree of elongation Measured according to JIS z1702.

14-0 Tear strength Measured according to JIS K6732 5, ○Measurement conditions 1 Surface resistivity, volume resistivity, beak Ichikawa, peak voltage due to external electric field, decay time 20℃, 65%
RH constant temperature room.

2 Physical properties are 23℃, 65%RH8 Pretreatment of 3 samples older brother Test ## must be kept under specified conditions for at least 24 hours. After that, it was measured at the same temperature.

[Brief explanation of drawings]

1 and 2 are perspective views of a part of the packaging material according to different embodiments of the present invention, and FIG. 3 is a partially cutaway perspective view showing the packaging material according to still another embodiment of the invention in a state in which all articles are housed therein. figure. 1 No. Inner layer film, 12 Outer layer film, 2
No...Middle layer film. Applicant's agent Patent attorney Takehiko Suzue=15-1;

Claims (6)

[Claims] (1) The packaging material used to package all products that are adversely affected by static electricity is made of a laminate of multiple plastic films, and the innermost film that comes into contact with the product has a low electrical resistance of 8 and the highest All packaging materials are characterized in that the outer film exhibits low surface electrical resistance. (2) Does the innermost layer film have a volume resistance of 10° or 1o10Ω? A packaging material according to claim 1. (3) The packaging material according to claim 2, wherein the innermost layer film is formed of a mixture of plastic and 24-electrode Cargin black gold. (4) Claims 1 to 3 in which the outermost film is made of a mixture of plastic and an antistatic agent.
Packaging charges listed in any of the following items: 0 (5) Claims 1 to 4 in the form of a bag
Packaging materials described in any of the paragraphs. (6) The laminate does not have a two-layer structure of an inner layer film and an outer layer film, the inner layer is made of a plastic that contains a conductive agent and an antistatic agent, and the outer layer is made of a plastic that contains an antistatic agent. patent h)
“Packaging materials as described in item 1.