JPH052173Y2 - - Google Patents

Description

[Detailed explanation of the idea]

TECHNICAL FIELD OF THE INVENTION The present invention relates to a shrinkable safety and health protection cover, and more particularly to a shrinkable safety and health protection cover that can be shrunk at low temperatures. Technical background of the invention and its problems When a hand or foot is injured, a bandage, cast, etc. is wrapped around the injured area to protect it. By the way, even if you are injured, you will often want to take a bath, but in this case, it is preferable to provide a safety and hygiene protection cover over the bandage or cast so that the bandage or cast does not get wet. In addition, when working in a work environment with a lot of dust, it is desirable for hygiene and safety reasons to prevent dust from adhering to the human body such as arms and legs, or to mechanical parts. cover is used. Further, as such safety and health protective equipment, a protective cover that can be brought into close contact with the object to be protected is used. By the way, although there are several sizes of plastic bags available for the protective covers used in the above applications, in most cases large protective covers that can be used by a large number of people are used. was often used. For this reason, when wearing the protective cover, it often feels loose or uncomfortable, and there are problems in that the object to be protected, such as a bandage or cast, may get wet and workability may be reduced. For this reason, it is necessary to create safety and health protection covers for the human body or mechanical parts that fit snugly over objects to be protected, such as bandages and casts, and therefore do not feel loose or uncomfortable when worn, and are inexpensive and disposable. Its appearance is strongly desired. Purpose of the invention The present invention is an attempt to solve the above-mentioned problems associated with the conventional technology.
Shrinkable health and safety protection for the human body or mechanical parts that does not feel loose or uncomfortable when worn, does not cause the protected object to get wet or reduce work efficiency, and is inexpensive and disposable. It is intended to provide cover. Summary of the invention The shrinkable safety and health protective cover according to the invention is made of ethylene-propylene-diene elastomer terpolymer (EPDM) or ethylene-propylene elastomer copolymer (EPM): 40 to 70% by weight, ethylene-vinyl acetate copolymer ( EVA) (vinyl acetate (VA) content of 10% or more): 30 to 60% by weight, and filler: 5 to 15% by weight.
It is made of a plastic film that is stretched 1.5 times or more at 45-55°C, and is characterized by shrinking by 5-46.5% when heated to 50°C. The shrinkable safety and health protection cover according to the present invention is 50
It is made from a plastic film that shrinks by 5 to 46.5% when heated to a temperature of 30 to 50 degrees Fahrenheit, so even a slightly larger protective cover will only shrink by 30 to 50 degrees after the cost.
When the protective cover is heated to a temperature of It does not get wet or reduce workability, and is inexpensive and disposable. Specific explanation of the invention The shrinkable safety and health protection cover according to the invention will be explained in detail below. The shrinkable safety and health protection cover 1 according to the present invention includes:
It is formed from a low-temperature shrinkable plastic film 2 that shrinks by 5 to 46.5%, preferably 10 to 46.5%, more preferably 15 to 46.5% when heated to 50 DEG C. with hot water or hot air. Specifically, the shrinkable safety and health protective cover made of such a low-temperature shrinkable plastic film is preferably heated to a temperature of about 30 to 50°C during use. In order to form the shrinkable safety and health protection cover 1 according to the present invention, for example, prepare the low-temperature shrinkable plastic film 2 as described above, insulate the parts other than the heat-sealed part, and then heat the heat-sealed part. It can be manufactured by bonding. It can also be manufactured by sewing the joint portions of the low-temperature shrinkable plastic film 2 together. For example, the low-temperature shrinkable plastic film used in this invention has the proportions listed in (A) below.
A polymer film obtained using EPDM or EPM, EVA, and talc as raw materials can be produced by stretching and molding it by a factor of 1.5 or more in at least one direction under the temperature conditions described in (B) below. (A) Blending ratio of EPDM or EPM, EVA, and talc EPDM or EPM: 40-70% by weight EVA (VA content 10% by weight or more) 30-60% by weight Talc 5-15% by weight (B) Temperature conditions Preheating temperature : 40~45℃ Heating and stretching temperature: 45~55℃ Cooling temperature (heat setting, annealing) Lower than the heating and stretching temperature, specifically 20~40℃
degree. Here, EPDM is ethylene-propylene-
Diene elastomer terpolymer (Ethylene-
Propylene-Diene Rubber). Also EPM
is an ethylene-propylene elastomer copolymer. Note that as the non-conjugated diene used in forming EPDM, hexadiene, dicyclopentadiene, ethylidene norbornene, methylene norbornene, propylidene norbornene, methyltetrahydroindene, etc. are used. As these EPDM or EPM, conventionally known ones are widely used. As mentioned above, the blending amount of EPDM or EPM is 40 to 70% by weight, but if the blending amount is less than 40% by weight, the resulting film will become sticky, which is not preferable. weight%
Exceeding this is not preferable because the moldability of the resulting film decreases. EVA is a copolymer of ethylene and vinyl acetate (Ethylene-Vinyl-Acetate).
copolymer), and the vinyl acetate (VA) content is
It is preferable to use 10% by weight or more.
If the vinyl acetate content is less than 10% by weight, it is not preferable because the resulting film has poor low-temperature stretchability. As mentioned above, this amount of EVA is
The amount is 30 to 60% by weight, but if the amount is less than 30% by weight, the formability of the resulting film will decrease, which is undesirable, while if it exceeds 60% by weight, the stretchability of the resulting film will decrease, which is not preferred. . Talc has a composition of 3MgO.4SiO ₂ .H ₂ O, and is a typical filler (usually leaf-like or scale-like). As mentioned above, the blending amount of talc is as follows:
The amount is 5 to 15% by weight, but if the amount is less than 5% by weight, blocking of the obtained film cannot be sufficiently prevented, so it is not preferable.
If it exceeds 15% by weight, the stretchability of the resulting film will decrease, which is not preferable. Note that calcium carbonate, barium sulfate, etc. can also be used instead of talc. By using these EPDM or EPM, EVA, and talc as raw materials and blending them in a specific ratio, a polymer film (unstretched film) obtained is stretched under the above-mentioned temperature conditions (B), A low temperature shrinkable film is obtained. Specifically, as shown in FIG. 2, the unstretched film 3 is passed through a pair of preheating rolls 4a, 4b, then passed through a pair of heated stretching rolls 5a, 5b, and then a pair of cooling (heating) rolls 5a, 5b. fixed) roll 6
a and 6b, the obtained stretched film may be wound onto a winding roll 7. The stretching ratio of the film can be adjusted by changing the rotational speed of the heated stretching rolls 5a and 5b. That is, the heated stretching roll 5
A is a low-speed rotating roll, heating stretching roll 5b is a high-speed rotating roll, and the rotational speeds of both rolls may be changed. Here, an example of manufacturing a low-temperature shrinkable film used in the present invention and its physical properties will be shown. A polymer film (unstretched film, film thickness 150 μm) consisting of 55% by weight of EPDM, 35% by weight of EVA (VA content of 28% by weight or more), and 10% by weight of talc,
A low-temperature shrinkable film was obtained by stretching at a stretching ratio of 2.0 to 5.0 under the following temperature conditions. Preheating temperature: 40°C Heating/stretching temperature: 50°C Cooling temperature (heat setting): 20°C The shrinkage rate of the low-temperature shrinkable film thus obtained was measured. The results are shown in Table 1. The shrinkage rate was measured under the following conditions. (1) Specimen size 120 (orientation direction) x 15 (m/m) ...For MD stretching 120 (orientation direction) x 15 (m/m) ...For TD drawing TD refers to the direction (vertical direction), and TD refers to the direction perpendicular to this (horizontal direction). (2) Warm water was used for the bath, and the immersion time was 3 seconds. (3) The shrinkage rate was calculated using the following formula. MD shrinkage rate (%) = 120 - Specimen size in MD direction after shrinkage / 120 x 100 TD shrinkage rate (%) = 120 - Specimen size in TD direction after shrinkage / 120 x 100

【table】

[Table] A bag-shaped shrinkable safety and health protective cover with a length of 60 cm and a width of 25 cm formed from the low-temperature shrinkable plastic film obtained in this way was soaked in hot water at 45°C for 3 minutes.
After being in contact with it for a second, it shrunk to a length of 48 cm and a width of 19 cm. The shrinkage rate in the length direction was 20% and the shrinkage rate in the width direction was 24%. When such a shrinkable health and safety protective cover was worn over a bandage and exposed to warm water at 45°C for 3 seconds, it shrunk uniformly and tightly fit the bandage. After the work is completed, the plastic film can be easily removed by tearing it in the MD direction, for example. Furthermore, the above-mentioned low-temperature shrinkable plastic film has excellent adhesion to the skin and soft feel, and does not slip off when gripping an object, and has excellent workability. Further, the above-described low-temperature shrinkable plastic film is inexpensive, and the protective cover formed from this film is disposable. Furthermore, the above-mentioned low-temperature shrinkable plastic film can be colored and can also be easily subjected to embossing. It is also possible to pass a string or band 8 through the top of the shrinkable health and safety protection cover according to the present invention. Effects of the invention The shrinkable safety and health protection cover according to the invention is made of the above-mentioned specific stretched plastic, and moreover, it is made of a plastic film that shrinks by 5 to 46.5% when heated to a temperature of 50°C. , Even with a slightly larger protective cover, after wearing it
When the protective cover is heated to 30 to 50°C, the protective cover will shrink and fit snugly to the object to be protected, such as a bandage or cast, so it will not feel loose or uncomfortable when worn, and therefore the cover will not feel loose or uncomfortable when worn. Protective objects do not get wet or work efficiency decreases,
Moreover, it is inexpensive and disposable, and is suitable as a shrinkable health and safety protective cover for the human body or mechanical parts.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a shrinkable safety and health protection cover according to the present invention, and FIG. 2 is an explanatory diagram showing the manufacturing process of a low-temperature shrinkable film used in the present invention. DESCRIPTION OF SYMBOLS 1... Shrinkable safety and health protection cover, 2... Shrinkable plastic film, 3... Unstretched film, 4a, 4b... Preheating roll, 5a, 5b
... Heating stretching roll, 6a, 6b... Cooling roll, 7... Winding roll.

Claims (1)

[Claims for Utility Model Registration] Ethylene-propylene-diene elastomer terpolymer (EPDM) or ethylene-propylene elastomer copolymer (EPM): 40 to 70% by weight, ethylene-vinyl acetate copolymer (EVA) (vinyl acetate (VA) ) content of 10% by weight or more): 30 to 60% by weight, and filler: 5 to 15% by weight.
A shrinkable safety and health protection cover made of a plastic film stretched 1.5 times or more at 45 to 55°C, and characterized by shrinking by 5 to 46.5% when heated to 50°C.