JPH09224748A - Plate side cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical film of a synthetic resin as a protective cover for a plate-shape object, which is easily set on and securely holds the object by keeping its circumference at a specific ratio to a total length of the object sides, and its tensile and residual stresses in the circumferential direction at specific levels. SOLUTION: Cylindrical film of a synthetic resin as a protective cover for a plate-shape object has a circumference 69 to 95% of a total length of the plate-shape object sides it protects, where 25% tensile and residual stresses in the circumferential direction are set at 4.0 to 7.0kg and 2.8kg or higher, respectively. Holding a plate-shape object of elasticity of the film, the protective cover can easily wrap the object without needing a tape holder or binder, its stresses lasting for an extended period. It will need a large force, when expanded to cover the object, if its 25% tensile stress exceeds 7.0kg. The protective cover is preferably of thermosetting resin, such as ethylene/methyl methacrylate copolymer and thermosetting polyurethane resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tabletop for a kotatsu or a table,
The present invention relates to a plate-shaped object side surface protective cover that prevents damage to the side surface of a plate-shaped object such as plywood, panels, and doors.

[0002]

2. Description of the Related Art Furniture top plates and plate-like objects such as plywood, panels and doors are protected from damage or damage during the distribution process from the producer to the store and from the store to the consumer. It was often wrapped in protective material such as Styrofoam and cardboard. However, conventionally used protective materials are usually in the form of a film, and the plate-like object cannot be sufficiently wrapped in the state as it is, and the end portion of the film is stuck with an adhesive tape, or a tape for binding is used. I had to hang it up. In addition, a masking tape was attached to protect the plate-like object, but the adhesive sometimes remained on the plate-like object when the tape was peeled off.

Further, when a plurality of plate-shaped objects are conveyed in a standing state, the front and back surfaces (two surfaces having the largest area) of the plate-shaped objects are protected by the adjacent plate-shaped objects, so that they are not easily scratched. On the other hand, the side surfaces (four sides except the front and back sides) are easily scratched.
Therefore, in order to efficiently protect the plate-like object with a small amount of protective material, it is preferable to protect only the side surface of the plate-like object, but only the side surface is protected with Styrofoam or corrugated cardboard that has been used as a protective material. Then, the adhesion between the protective material and the plate-shaped material may be slipped off due to poor adhesion.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a plate-like object side surface protective cover which is easy to mount. In particular, it is to provide a protective cover that does not slide down even after being worn for a long time. Also,
At the same time, it is necessary to manage the plate-like material in a hygienic manner and to remove the odor generated from the plate-like material.

[0005]

As a means for solving the above problems, a cylindrical film made of a synthetic resin having a circumference of 65 to 95% of the total length of the side surfaces of a plate-like material. And the 25% elongation stress in the circumferential direction of the film is 4.
There is provided a plate-shaped object side surface protective cover characterized by having a residual stress of 0 to 7.0 kg and a 25% residual stress of 2.8 kg or more, and the cylindrical film further contains an antibacterial agent. The plate-shaped object side surface protective cover is provided, and further, the plate-shaped object side surface protective cover is provided in which the cylindrical film contains a deodorant. The plate-like object side surface protective cover is provided in which the strip-shaped film is a multilayer film including at least one layer made of an ionomer resin.

That is, the inventors have found that the above-mentioned problems can be solved by using a film having excellent elasticity and sustaining stress for a long time as a protective cover. Since the plate-shaped object side surface protective cover according to the present invention tightens the plate-shaped object by the elasticity of the film itself, it is easy to mount without tape fastening or banding for binding, and the stress lasts for a long time. It is possible to prevent the protective cover from slipping off the plate-shaped object.

Hereinafter, the present invention will be described specifically.

As a result of various experiments, the applicants of the present invention extend the film when the protective cover is attached to the plate-like object. Therefore, the stress at the time of extension greatly affects the workability. It can be evaluated by the stress applied for 25% elongation (hereinafter referred to as 25% elongation stress), and it has been found that the preferable range is 4.0 to 7.0 kg. When the mounting work is performed manually, if the 25% stretching stress exceeds 7.0 kg, a large force is required to stretch the protective cover for mounting, and the workability deteriorates. Further, if the stress is less than 4.0 kg, the film may be locally stretched during the work and the film may be distorted, or the film may be stretched too much and the elasticity may be lost.

Further, in order to prevent the film from coming off even after being used for a long time, a film having less stress relaxation is preferable. Specifically, the stress after stretching by 25% and holding for 1 minute (hereinafter, 25%
It is called residual stress. It was found that at least about 2.8 kg is required.

The plate-like side surface protective cover according to the present invention is preferably made of a thermoplastic resin in order to have the above-mentioned physical properties. In particular, it has elasticity when formed into a film, and the time elapses. Even if it is made of a resin whose elasticity is not deteriorated, it is preferable. Examples of such a resin include an ethylene-methyl methacrylate copolymer, a thermoplastic polyurethane resin, and a polyethylene resin polymerized using a single-site catalyst. In order to reduce the thickness of the plate-shaped object side surface protective cover, it is preferable that the cylindrical film is a multi-layered film and at least one elastic resin layer is provided in addition to the elastic resin layer. As a layer of such a strong resin, a layer made of an ionomer resin is exemplified.

The plate-like object side surface protective cover of the present invention is manufactured by, for example, an inflation extrusion molding method using a multi-layer die to produce a multi-layered tubular film, which is perforated for cutting in a direction perpendicular to the winding direction. However, the present invention is not limited to this, and it is of course possible to form an ordinary film into a cylindrical shape and use it.

The plate-like object side surface protective cover of the present invention is attached to the plate-like object by utilizing the elasticity of the film itself.
It is preferably cylindrical and the circumference thereof is preferably 65 to 95% of the total length of the side surfaces of the plate-shaped material. If the inner diameter is less than 65%, the film will be stretched to a state where it exceeds the yield point when the cover is attached, which is not preferable because the film is distorted and loses elasticity or breaks. It is not preferable because the force for tightening the object is insufficient.

The resin forming the side surface protective cover of the present invention may contain various additives such as a lubricant and an anti-blocking agent. Furthermore, when the plate-shaped product is used in a medical institution or the like, it is preferable that the resin forming the side surface protective cover contains an antibacterial agent, because it is possible to prevent bacteria from growing on the plate-shaped product. An example of such an antibacterial agent is a silver-zeolite antibacterial agent.

Furthermore, when the resin forming the side surface protective cover according to the present invention contains a deodorant, it is possible to reduce the irritating odor of the adhesive or the like generated from the plate-like material, and to prevent external odor. It is possible to prevent the transfer to a plate-like object. Examples of such a deodorant include a mixture of an inorganic metal salt and iron oxide.

[0015]

The present invention will be described in more detail with reference to the following examples. Various properties were evaluated by the following methods. <25% Elongation Stress> According to JIS L1080, the circumferential direction of the side surface protection cover was measured in the same manner as the modulus at an elongation of 25%, and the result was expressed as an extension load actually measured. The tensile speed was 200 mm / min and the width of the test piece was 50 mm. This is the same as the width of the side surface protection cover that is preferably used for a plate-shaped object having a thickness of about 30 mm. <25% Residual Stress> In accordance with JIS L1080, measurement was made in the circumferential direction of the plate-like object side surface protective cover. 25
25% film under the same conditions as when measuring% elongation stress
% Elongation, the state was continued for 1 minute, and the residual stress was measured and expressed as an actually measured load. <Antibacterial effect> On a plastic dish that has been sterilized in advance,
A JIS inorganic salt agar medium was dispensed and solidified, a test piece was placed on the medium, a spore suspension of the test bacteria was inoculated with a microspray, and the cells were cultured at 28 ± 2 ° C for 7 days. Was observed. As test bacteria, Aspergillus niger, P
enicillium citrium, Chaetominum globosum, Rhizopus
nigricans and Cladosporium cladosporiodes were used.
In addition, the antibacterial effect is evaluated by the mold generation area on the test piece,
The evaluation was made on a scale of 1 to 4. 4 indicates that no mold growth was observed on the test piece, 3 indicates that the mold growth area is 1/3 or less, and 2 indicates that the mold growth area is 1.
/ 3 to 2/3, and 1 indicates that the mold growth area is 2/3 or more.

Example 1 An ethylene-methyl methacrylate copolymer (hereinafter referred to as EMMA) for the outer and inner layers (Sumitomo Chemical Co., Ltd.,
Grade name: CM8014) mixed with 1 wt% of silver-zeolite antibacterial agent, and an ionomer (made by Mitsui DuPont, trade name: Himilan 1856) in which an ethylene-methacrylic acid copolymer is metal-crosslinked in the intermediate layer. Using an inflation coextrusion method, the inner diameter is 600
mm (film folding width 942 mm), thickness 150 μm, and after producing a three-layer tubular film having an outer layer: intermediate layer: inner layer thickness ratio of 1: 1: 1, the tubular film was cut into a width of 50 mm. Thus, the plate-shaped object side surface protective cover of the present invention was obtained. Incidentally, this is for a plate-like object having a circumference of 2400 mm and a thickness of 30 mm. The surface of the obtained cover was satin-finished and had a high-grade feeling.
Table 1 shows various properties. Further, the protective cover was actually attached to the side surface of the plate-like object, and the workability and the state of the cover one hour after the attachment were examined.

Example 2 A plate-like product was prepared in the same manner as in Example 1 except that linear low-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd., trade name: EUL430) was used for the intermediate layer, and the total thickness was 240 μm. Got side protection cover. Table 1 shows various properties. Further, as in Example 1, the ease of mounting work and the state of the cover after 1 hour were examined.

Example 3 The same method as in Example 1 was repeated except that the thermoplastic polyurethane elastomer (adipate type) mixed with 1 wt% of silver-zeolite antibacterial agent was used to make the total thickness 200 μm. Got the cover. Table 1 shows various properties. Further, as in Example 1, the ease of mounting work and the state of the cover after 1 hour were examined.

Example 4 A side surface protective cover for plate-like material was obtained in the same manner as in Example 1 except that EMMA mixed with 1 wt% of silver-zeolite antibacterial agent was used to make the total thickness 240 μm. Table 1 shows various properties. Further, as in the case of the first embodiment, the mounting work is easy,
The state of the cover after the elapse of time was examined.

Comparative Example 1 EMMA (Sumitomo Chemical Co., Ltd., grade name: CM8014) was used for the outer and inner layers, and an ethylene terpolymer (Mitsui DuPont Co., Ltd., trade name: AN42) was used for the intermediate layer.
13), having a thickness of 150 μm and an outer layer: an intermediate layer:
After manufacturing a three-layer tubular film having an inner layer thickness ratio of 1: 1: 1 and an inner diameter of 600 mm, the tubular film was cut into a width of 50 mm to obtain a plate-shaped object side surface protective cover of the present invention. Table 1 shows various properties. Further, as in Example 1, the ease of mounting work and the state of the cover after 1 hour were examined.

Comparative Example 2 A plate-like object side surface protective cover was obtained in the same manner as in Example 1 except that the total thickness was 240 μm. Table 1 shows various properties.
Further, as in Example 1, the ease of mounting work and the state of the cover after 1 hour were examined.

Comparative Example 3 A plate-shaped object side surface protective cover was obtained in the same manner as in Example 3 except that the total thickness was 150 μm. Table 1 shows various properties.
Further, as in Example 1, the ease of mounting work and the state of the cover after 1 hour were examined.

[0023]

[Table 1]

As is clear from Table 1, the plate-like object side surface protective covers of Examples 1 to 4 have a 25% elongation stress of 4 to 6 kg.
And, it was possible to extend and put on it relatively easily with the help of a person. These films adhered well to the plate-shaped object even after 1 hour from the mounting. In addition, the appearance was good, and in addition, an antibacterial effect was recognized.

In Comparative Examples 1 and 3, the 25% elongation stress was small, and the cover was locally distorted when the cover was attached to the plate. The 25% residual stress was also small, and after 1 hour, the cover was stretched and a gap was formed between the cover and the plate.
On the contrary, Comparative Example 2 had a large 25% elongation stress, and the mounting work was difficult. In addition, the film used in Comparative Example 1 did not show antibacterial properties.

Furthermore, the films used in Example 1 and Comparative Example 2 having the ionomer resin layer as the intermediate layer had an extremely small amount of additive bleeding out on the surface, as compared with the other films. This is presumably because the additive migrates to the ionomer resin layer side.

[0027]

[Effect] Since the plate-shaped object side surface protective cover according to the present invention adheres to the plate-shaped object by the force of the cover itself, it is necessary to stop the end of the protective material with an adhesive tape or band the tape with a binding tape. There is no. Further, since the proper waist strength and the good elasticity can be maintained for a long time, the cover does not fall off the plate-like object during transportation.

In particular, when at least the resin forming the outermost layer contains an antibacterial agent, bacteria can be prevented from propagating on the side surface protective cover of the plate even if the plate is gripped with a dirty hand. . In addition, when the deodorant is contained, it is possible to remove the odor generated from the plate-like material and prevent external odors from adhering to the plate-like material.

Further, when the ionomer resin layer is provided on the tubular film, a relatively thin plate-like side surface protective cover having appropriate elasticity and good elasticity can be obtained. Furthermore, since the ionomer resin can be easily oriented, if it is oriented perpendicular to the winding direction of the tubular film during film formation, the cylindrical film is cut into a certain width in order to obtain a plate-like side surface protective cover. At that time, it is possible to cut in a good direction with a small force. In addition, the effect of preventing the additive from bleeding out on the surface can be obtained.

Further, the plate-like object side surface protective cover according to the present invention can be suitably used in a distribution process from a producer to a store and from a store to a consumer, but the cover can be attached very easily and a special machine can be used. Since it is not necessary, it can be easily installed in a general home. Therefore, for example, when moving, it can be suitably used as a protective material for household items that are easily damaged, a protective material for storing furniture or the like in a barn, or a dust protector.

Claims (4)

[Claims] 1. A cylindrical film made of a synthetic resin, the circumference of which is 65 to 95% of the total length of the side surfaces of the plate-like material, and the film is elongated by 25% in the circumferential direction. Stress is 4.
0-7.0 kg, 25% residual stress is 2.8 kg or more, a plate-like object side surface protective cover. 2. The plate-like object side surface protective cover according to claim 1, wherein the cylindrical film contains an antibacterial agent. 3. The plate-like object side surface protective cover according to claim 1, wherein the cylindrical film contains a deodorant. 4. The plate-like object side surface protective cover according to claim 1, wherein the cylindrical film is a multilayer film including at least one layer made of an ionomer resin.