JPS62222837A - Article package - 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] [Industrial Application Field] The present invention relates to an article packaging body, and specifically, to effectively protect home appliances, office equipment, furniture, etc. from scratches and damage during storage and transportation. The present invention relates to an article packaging body that can be used as a packaging material.

[Problems to be solved by conventional technology and inventions] Previously, it has been possible to prevent scratches and damage during storage and transportation of home appliances such as televisions and audio equipment, as well as office equipment, precision equipment, furniture, and other items. In order to do this, these items are made of resin foam molded material 1 corrugated cardboard.

It is packed in an outer case such as a wooden frame. In this case, the item is usually wrapped in a low-density polyethylene film or the like in advance to prevent moisture and dirt from adhering to the exterior material or dirt caused by dirt or dust from outside. Through cushioning material, cardboard case, wooden frame.

A commonly used method is to fix it with a band or the like.

However, although this method can initially prevent moisture-proofing and dust adhesion, friction between the packaging film and the product during transportation and handling may cause scratches on the surface of the product (t), peeling of paint or plating, etc., and the commercial value of the product. In order to solve this problem, we have developed the following methods: ■Wrap the article in a heat-shrinkable film, heat-shrink it, and then put it into an outer case through blowing.■Foaming A method using a multilayer sheet made by laminating a polyolefin sheet and a high-density polyethylene film has been proposed and put into practical use. However, method (2) not only requires a heat-shrinkable film but also a heat tunnel for shrinkage. The disadvantage is that the equipment, installation space, and electricity consumption are large, and the total packaging cost is high.

In addition, in method (2), the multilayer sheet becomes expensive due to the lamination process and sheet thickness, and the thickness of the foamed sheet is usually 500 to 6 ooμ, which causes problems such as bulk, handling, and cost in manufacturing, storing, and transporting the multilayer sheet.
- It has the disadvantage that the packaging cost of tar is similarly high, and there is a strong demand for a solution to this problem.

On the other hand, the present applicant has proposed packaging an article with the surface of a thermoplastic resin film having a larger friction coefficient on the inside, which has a different coefficient of friction between the front and back surfaces, and then arranging a cushioning member on the outside. We have already proposed ways to package goods. (
JP 61-127483). However, simply making the friction coefficients of the two outer layers different is not necessarily sufficient, and it is difficult to completely protect household appliances that have transparent resin parts during storage and transportation, and scratches may occur. There was a problem that it could not be put into practical use.

An object of the present invention is to solve the above-mentioned conventional problems, and to provide an inexpensive article packaging body that provides good protection for articles, has sufficient strength even with a thin wall, and has an excellent appearance. It is something.

[Means for Solving the Problems] That is, the present invention provides a packaged article consisting of (A) a low-density polyethylene resin layer, (B) a foamed polyolefin resin layer, and (C) a high-density polyethylene resin layer. The present invention provides an article package in which a multilayer film is packaged with the low-density polyethylene resin layer side facing inside and fixed with a cushioning member.

In the present invention, (^) a low-density polyethylene resin layer, (B) a foamed polyolefin resin layer, and (C) a high-density polyethylene resin layer, which have different physical properties such as the coefficient of friction on the inner and outer surfaces, and have intermediate foamed Using a multilayer film of layers.

Here, the low density polyethylene resin forming the layer (A) has a density of 0.900 to 0.940 g/cm3 and a melt index (MI) of 0.1 to 50 g/10 min, preferably a density of 0.905 to 0. 935g/cm3, Ml
O, 2 to 30 g 710 minutes, particularly preferably density 0.91
0-0.930g/cm3, Mlo, 3-20g710
minutes are used. Low-density polyethylene resins include high-pressure low-density polyethylene (LDPE), ethylene and propylene obtained by medium and low-pressure methods, and butene-1,4.
-3 to 1 carbon atoms, such as methylpentene-1 and octene-1
Copolymers of 2 with α-olefins, so-called linear low-density polyethylene (LLDPE), copolymers of ethylene with vinyl polymers such as aromatic olefins, acrylic esters, and vinyl acetate, etc., or mixtures thereof. is used. Among them, ethylene/vinyl acetate copolymer or ethylene/vinyl acetate copolymer and 50%
Particularly preferred are mixtures with DPE, LLDPE, ionomers and the like. Here, the ethylene-vinyl acetate copolymer (EVΔ) has a vinyl acetate content of 5 to 35% by weight, preferably 7 to 30% by weight, and a density of 0.
920~0.940g/cm3, MI O, 5~zog
/io is preferably used. By selecting this, it is possible to sufficiently protect articles that are particularly susceptible to scratches, such as resin transparent parts of household electrical appliances.

This low-density polyethylene resin may have a low crystallinity or non-quality density of 0.850 to 0.895 g/c, if necessary.
m3 of ethylene-propylene copolymer, ethylene-butene-1 copolymer, petroleum resin, terpene-phenol resin, etc. can also be blended in an amount of 30% by weight or less.

This low-density polyethylene resin layer imparts slip resistance and flexibility to the multilayer film, is used on the surface that comes into contact with the packaged article, and plays an important role in protecting the packaged article. Furthermore, this low-density polyethylene resin layer improves foaming of the intermediate layer and also improves film moldability, particularly blown film moldability. The static friction coefficient of the surface of this low-density polyethylene resin layer is usually 0.4 or more, preferably 0.5 or more, and more preferably 0.6 or more. Note that the static friction coefficient in this case indicates the static friction coefficient between the surfaces of the low-density polyethylene resin layer (ASTM
D-1894).

Next, layer (B), ie, the intermediate layer of the multilayer film, is formed of a polyolefin resin foam layer. Here, the polyolefin resin is high density polyethylene (HDP).
E), low density polyethylene (LDPE), linear low density polyethylene (Ll, DPE), ethylene-
Examples include polyethylene resins such as unsaturated carboxylic acid copolymers, polypropylene, polybutene, copolymers of these with other α-olefins, and mixtures thereof. Among these, polyethylene resins are preferred as polyolefin resins, and low density polyethylene and linear low density polyethylene are particularly preferred. Here, the linear low density polyethylene is a copolymer of ethylene and an α-olefin having 3 to 12 carbon atoms, such as propylene, butene-1,4-methylpentene-1, octene-1, and the like. These low density polyethylenes and linear low density polyethylenes have a density of 0.900 to 0.
．． 940g/cm3. Melt index (MI) Q
, 1-50g710min, preferably density 0.910-0
．． 930g/cm3. Ml of 0.2 to 20 g and 710 minutes is used. Note that it is also possible to mix 50% by weight or less of an elastomer or other resin with these polyolefin resins. Furthermore, if necessary, up to 50% by weight of inorganic fillers, such as calcium carbonate, talc, clay, kaolin, and titanium oxide.

It is also possible to blend zeolite and the like.

The foaming agents that can be used to form the polyolefin resin foam layer can be broadly classified into chemical foaming agents and physical foaming agents based on their foaming mechanism. Among these, chemical blowing agents include azodicarbonamide, metal salts of azodicarbonamide, hydrazodicarbonamide, p-1-luenesulfonyl hydrazide, dinitropentamethylenetetramine, azodiisobutyronitrile, etc.
Physical blowing agents include butane, heptane, hexane, dichlorodifluoromethane, nitrogen, carbon dioxide gas, and the like.

In this polyolefin resin foam layer, the blending ratio of the raw material resin polyolefin resin and the blowing agent is not particularly limited and varies depending on the type of blowing agent, etc., but the foaming ratio is 1.
It may be determined to be 2 to 5 times, usually 1.5 to 3 times. This polyolefin resin foam layer preferably has small cell diameters. Further, if necessary, inorganic fine powder or metal salts of higher fatty acids can be appropriately added to this polyolefin resin foam layer as a cell nucleating agent. Sodium stearate is a metal salt of higher fatty acids.

Examples include calcium stearate and magnesium stearate, and by adding 0.03 to 1% by weight of these nucleating agents, uniform foaming can be achieved.

This polyolefin resin foam layer has the role of making the multilayer film opaque and giving it a pearlescent appearance, as well as providing cushioning properties to the multilayer film.

Furthermore, the high-density polyethylene resin forming the layer (C) has a density of 0.945 to 0.975 g/cm3, MT
0.01-5g/lo min, preferably density 0.947-
0.970 g/cm3. MI 0.02~2 g7
A 10 minute test is used. This high-density polyethylene resin includes ethylene homopolymer, propylene,
It may also be a copolymer with other α-olefins such as butene-1. In addition, as high-density polyethylene resin,
Low-density polyethylene, low-crystalline or non-crystalline ethylene-propylene copolymer with a density of 0.850 to 0.895 g/cm3, ethylene, etc. in an amount of 50% by weight or less within a range that does not impair the slipperiness of the present invention. -Butene-1 copolymer may be added.

This high-density polyethylene resin layer provides slipperiness and strength to the multilayer film, and is used as the outer surface when packaging articles. When the package vibrates, the vibration is transferred between the outer surface of the film and the cushioning member. It works by absorbing the material and preventing direct rubbing between the item and the cushioning member, thereby protecting the item. Therefore, the coefficient of static friction is usually 0.35 or less, preferably 0.3 or less. Further, this high-density polyethylene resin layer improves foaming of the intermediate layer and improves moldability of the multilayer film.

In addition, instead of this high-density polyethylene resin layer, it is possible to use low-density polyethylene with a slip agent added, but in reality, the slip agent would migrate to the middle foam layer, making it slippery. Can't get to the surface.

The multilayer film used in the present invention is composed of three layers as described above, and the article to be packaged is packaged with the layer (A) on the inside. Here, the thickness of the multilayer film is usually 30
~300μ, especially 40-200μ. In addition, the layer ratio of each layer is layer (A) one layer (B) two layers (C) = 5 to 60:10
~90:5-70, especially 10-40:20-80:10
It is preferable to set it to 50. In addition, since it is difficult to measure the thickness of the foamed film, the layer ratio in this case is shown as the usage ratio of the raw material resin when the intermediate layer is not foamed.

Such a multilayer film of the present invention can be produced, for example, by coextrusion blow forming or T-die coextrusion. In the case of coextrusion inflation molding, the raw material resins are sufficiently melted and kneaded using each extruder, and then the low density polyethylene resin is used as the outer layer, and the inner adhesive is coextruded to form a coextruded cylindrical film. Often, this can also be opened to form a flat film. In this case, the die temperature is usually 130-180
℃, the die lip gap is 0.5 to 2.0 mm, and the blow ratio is 1.5 to 5.0. By this coextrusion inflation molding, the foaming agent-containing resin layer is formed into resin layer (A), resin layer (C).
), the foaming is good, and there are no problems such as eye stains adhering to the die, and a multilayer film can be obtained stably for a long time. Particularly preferred.

In addition, in the case of T-die coextrusion, it is preferable to use a so-called enveloping die in which layer (A) and layer (C) enclose the polyolefin resin foam layer (layer (B)), which is an intermediate layer. .

The article packaging body of the present invention is made by wrapping the article to be packaged with the low-density polyethylene resin layer side of the above-mentioned multilayer film inside, and fixing the packaged article with a cushioning member.

There are no particular restrictions on the items to be packaged, but they include home appliances that need to be protected from scratches and damage.

Office equipment, precision equipment, furniture, etc. are particularly suitable.

The article to be packaged may be packaged by using a bag-like film as the multilayer film or by wrapping the article with a flat film.

Cushioning members used to secure packaged items after packaging include:
Examples include resin foams such as polystyrene foams and polyolefin foams, and corrugated cardboard. FIG. 1 is a perspective view showing one embodiment of the article packaging body of the present invention.

The article packaging body 1 of the present invention is made by wrapping the packaged article 3 with the multilayer film 2 as described above, and fitting and fixing the cushioning member 4 to the packaged article. It may be stored in the case 5 or fixed with a wooden frame, band, adhesive tape, or the like.

[Example] Next, the present invention will be described in detail, but the present invention is not limited thereto unless it exceeds the scope of the present invention.

Examples 1 to 5 The resins shown in Table 1 were melt-kneaded using three extrusion molding machines, introduced into an in-die adhesive type circular die for coextrusion, and inflation molded at a blow ratio of 3 to form an intermediate layer ( A three-layer cylindrical film in which B) was foamed was obtained. Note that 4 parts by weight of an azodicarbonamide foaming agent masterbatch was added to the intermediate layer (B). The layer ratio of the film is the middle layer (B
Table 1 shows the film thickness calculated from the raw material in which the intermediate layer (B) was not foamed, and the film thickness calculated from the raw material in which the intermediate layer (B) was not foamed was 60 μm. Note that the intermediate foam layer of the obtained multilayer film had a foaming ratio of t, a ~ 2.2, and a total thickness of about 80 μm. Table 1 shows the results of measuring the physical properties of the obtained film.

Next, this film is cut open, and electrical equipment (with a transparent polycarbonate plate surface) is packaged with the outer layer (A) low-density polyethylene resin layer side facing inside. After being fixed with a cushioning material, it is packed in a cardboard box and subjected to vibration. Test machine (Shinnichi Sokki F-8
00) under vibration conditions 30 It z.

It was vibrated at 7G for 15 minutes, and the appearance of scratches on the surface of the transparent polycarbonate plate was observed and evaluated according to the following criteria.

The results of this vibration test are shown in Table 1.

◎: No scratches ○: Almost no scratches △: Many dotted scratches occurred ×: Many large dotted scratches occurred Comparative Example 1 Same as Example 1 except that low density polyethylene resin containing a slip agent was used as the inner layer resin. I followed the instructions. The results are shown in Table 1.

Comparative Example 2 The procedure of Example 1 was followed except that no blowing agent was added to the intermediate layer. The results are shown in Table 1.

Reference Example Table 1 shows the physical property measurement results and vibration test results for a commercially available laminate film (a laminate film of a foamed low-density polyethylene film with a thickness of 5 ooμ and a high-density polyethylene with a thickness of 13 μ).

Resin HDPE for the inside, made by Idemitsu Petrochemical ■, Idemitsu Polyethylene I Half 6400F, density 0.950g/cm'.

MI 0.03 g710 min], DPE-A: manufactured by Toyo Soda Kogyo ■, Petrocene 2
05゜Density 0.924g/cm3. Mr 3 g/
10 minute LDPE-B: manufactured by Toyo Soda Kogyo ■, Petrocene 175°, density 0.921 g/cm3. Old 0. [i
g/10 minutes LLDPE-I: Made by Idemitsu Petrochemical ■, Moretic 0138N.

Density 0.920g/cm3. M) 1 g/10
LLDPE-II: Manufactured by Idemitsu Petrochemical ■, Idemitsu Polyethylene-L 0134L, density 0.920g/cm3
゜M11g710min LLDPE-III: Manufactured by Idemitsu Petrochemical ■,
Idemitsu polyethylene L 0234H, density 0.920g
/cm3゜MI 2g/10min (erucic acid amide added) LDPE-C: LDPE-A with slip agent (2% by weight of erucic acid amide) added EVA: Toyo Soda Kogyo ■, Ultrasen 54
0゜density 0. '127g/c+n3. MI 3g
/l (1 minute.

Vinyl acetate content 10% [Operations and effects of the invention] Since the article packaging body of the present invention adopts the above-mentioned structure, the article can be well protected during storage and transportation. , it is possible to effectively protect products that are prone to scratches.

That is, the multilayer film used in the article packaging of the present invention has excellent tensile breaking load, Elmendorff tensile strength, and film impact strength. Moreover, in the present invention, by using a layer (A) with a coefficient of static friction larger than that of the layer (C), there is less slippage between the packaged article and the packaging film, while the packaging film and the cushioning member are more likely to slip. ing. Therefore, there is no rubbing between the packaged article, which is generally made of a hard material, and rather, the packaging film and the packaged article are fixed, and the cushioning member and the packaging film, which are made of an extremely soft material, are not rubbed against each other. Easily causes slippage. Therefore, there is no risk of damage to the film, and there is no possibility of damaging the product or peeling off the coating due to friction between the film and the packaged product, effectively protecting the packaged product. I can do it.

Moreover, in the article packaging body of the present invention, the multilayer film used can be made thin, and moreover,
Even a thin μ film has sufficient strength and protection performance. Therefore, the workability is high, and there is no bulkiness of the film during storage and transportation, and the total packaging cost can be reduced and resources can be saved.

Furthermore, unlike conventional shrink packaging, special equipment is not required, and the packaging process is extremely simple.

Furthermore, the multilayer film used in the present invention has good surface printability, and has a pearl-like luster and a high-quality appearance with a Japanese paper feel, and can be made into a beautiful package.

Moreover, since the multilayer film in the article packaging body of the present invention can be easily obtained in various sizes, it is not limited by the size and shape of the article.

Therefore, the article packaging body of the present invention is a home appliance.

It can be effectively used as packaging for various items including office equipment, precision equipment, furniture, etc.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the article packaging body of the present invention. 1... Article packaging body, 2... Multilayer film. 3... Goods to be packaged, 4... Cushioning member. 5...Exterior case patent applicant Idemitsu Petrochemical Co., Ltd. Figure 1 Procedural Order (Self-sealed) April 14, 1985 Commissioner of the Japan Patent Office Kuro III Akira 7jt Tono 1, Case Indication Patent Application 1988- 17974 2. Name of the invention Article packaging 3. Relationship with the person making the amendment Patent applicant Idemitsu Petrochemical Co., Ltd. 4, Agent ■ 104 1-1-10-5 Kyobashi, Chuo-ku, Tokyo Details subject to amendment Contents of the amendment in the Detailed Description of the Invention column and Drawing 6 in the book (1) In the first line from the bottom of page 5 of the specification, "1 ethylene-vinyl acetate" is corrected to "ethylene-vinyl acetate." (2) "Ethylene/vinyl acetate" on page 6, line 1 of the same page [
Corrected to ``ethylene-vinyl acetate.'' (3) rLLDPE-■ on page 18, lines 11-16:
...(Addition of erucic acid amide)" is deleted. (4) Correct Figure 1 as shown in the attached sheet. (that's all)

Claims (3)

[Claims] (1) Place the packaged article with the low-density polyethylene resin layer side of the multilayer film consisting of (A) a low-density polyethylene resin layer, (B) a foamed polyolefin resin layer, and (C) a high-density polyethylene resin layer. An article packaging body made by wrapping the product and fixing it with a cushioning member. (2) The article packaging according to claim 1, wherein the low-density polyethylene resin is an ethylene-vinyl acetate copolymer. (3) The article package according to claim 1, wherein the polyolefin resin foam layer is a low density polyethylene resin foam layer.