KR100246995B1 - Buoyance material - Google Patents

Abstract

It is an object of the present invention to provide a buoyant material for the use of personal care products to achieve a light and soft texture and have waterproof, cold protection, and warmth, and, in case of emergency, to act as a lifesaving motion.

The present invention is a synthetic resin foam sheet having a fine independent bubble, the sheet is less than 0.04mm in thickness, the apparent density (Apparent Density) is characterized in that the buoyancy material is characterized by 0.002-0.2g / cm ³ , It is used as a center material of an article to give buoyancy.

Description

Buoyant materials for use in personal goods

1 is a manufacturing flowchart of the buoyancy material for use in the personal goods according to the present invention,

2 is a fracture front view showing an example of a long jacket that is one of the personal items using the buoyancy material according to the invention as a center material,

3 is a fracture front view showing an example of a short jacket which is another one of the personal items using the buoyancy material according to the present invention,

Figure 4 is a fracture front view showing an example of the vest (Vest), which is another one of the personal goods using the buoyancy material according to the invention as a center material,

5 is a front view showing still another embodiment of FIG.

<Description of the symbols for the main parts of the drawings>

1: whole body 2: back body

3: sleeve 4: pocket

5: Quilting (Quilting) 6: buoyancy material (center: 中芯)

7: lining paper 7a: mesh cloth

8 flap 9 transfer part

10: zipper

[Purpose of invention]

[Technical field to which the invention belongs and the prior art in that field]

The present invention is to prevent drowning accidents caused by sea, rivers, lakes or feng shui by using buoyancy material having buoyancy property in personal goods such as clothing, and is particularly light and soft touch compared to the foam having the conventional buoyancy characteristics. The present invention relates to a buoyant material that has a buoyancy characteristic by being easily applied to personal items such as clothes worn everyday.

In general, lifejackets are widely used for the purpose of preventing drowning by water. Lifejackets are called floating jackets that are worn to float the human body, and their performance is specified in Japanese Standard Table (JIS F 1026). It is difficult to wear it as a personal item, and there is a limitation in use that it can be used only for any specific purpose.

On the other hand, it was developed as a wooden base to solve these points, the center of the fixed polyethylene foam manufactured by the "method of manufacturing low density polyethylene foamed resin" of Publication No. 91-5864 disclosed in Korean Patent Publication No. 2412 In general, the thickness of one or two or more sheets overlapping each other is 0.5mm or more and several tens of mm, and in order to give buoyancy, they have to have a considerable thickness, and floating jackets are generally waterproof. It is a cloth or sheet that completely covers the buoyancy material to prevent water from penetrating the inside.

For this reason, these items also have a problem that it is difficult to easily apply to everyday personal items.

[Technical problem to be achieved]

However, modern times are in a situation where unexpected floods and drownings occur in our daily living environment, commuting, commuting and work, or leisure and sports. It is virtually impossible to always wear a conventional lifejacket in preparation for such an unexpected accident.

Therefore, the object of the present invention is to use a garment material having a light and soft touch and excellent waterproofing, cold protection, and warmth in everyday life, and in case of emergency, buoyancy for use in personal goods such as clothes which have a buoyancy effect such as lifesaving motion. It is in providing the ashes.

[Means for solving the problem]

In order to achieve the above object, the buoyancy material for use in the new article of the present invention is a synthetic resin foam sheet having fine independent bubbles, the sheet thickness is preferably 0.04mm or less, the apparent density is 0.002-0.2 the g / cm ^3, preferably wherein the ³ 0.01-0.1g / cm.

Here, polyolefin, polyurethane, polystyrene, etc. are used as the synthetic resin foam sheet having fine independent bubbles, and among them, single or mixture of high density, medium density or low density polyethylene or polypropylene, mainly of polyethylene and polypropylene, or these Modified copolymer of is preferable. In order to increase the flexibility, graft copolymers such as EPDM, styrene, butadiene oligoma and the like having an unsaturated double bond can be effectively used.

In order to impart good buoyancy to the sheet, it is necessary to make a fine independent foam foam. Therefore, as a blowing agent, in addition to halogenated hydrocarbons such as liquid propane gas (LPG), Freon 12, and the like, as a foaming agent, azodicarbonamide sodium citrate, sodium bicarbonate, etc. are effective as the chemical foaming agent, and the thickness is preferably 0.04 mm or less. The apparent density is 0.002-0.2g / cm ³ , preferably 0.001-0.1g / cm ³ . Outside of these numerical ranges, there is a fear that the buoyancy will be lowered and the flexibility or strength will be inadequate.

The buoyant material is used to make personal items, but mainly clothing, especially work clothes, student clothes, jackets, jumpers, vests, underwear, panties, etc., personal items such as socks, gloves, and winter coats, or skis and water skis. It is widely used for leisure clothes such as ice skates, swimwear, and jackets. It can also be applied to belongings carried on the body, such as bags, ransels, and rucksacks.

In the case of the garment, it is preferable to make one or more of the above buoyancy materials at the center of the garment and to make the outer cover material and to quilt the sewing. The method of inserting the buoyancy material which is put in the middle of a mesh between the outer surface and the lining of a garment is also applied. A bag is also a personal article having buoyancy which is made by stacking one or more said buoyancy materials in the center of base materials, such as a rucksack, and integrally by sewing or heat welding together with an outer skin. An important point of the amount of buoyant ash is about 110-130g per 50kg body weight.

Particularly important at this time is to completely cover these buoyancy materials as shell material so that there is no contact with water. Therefore, it is necessary to use a water-permeable mesh fabric for all or part of the shell material so that the buoyant material in the center directly contacts the water when it falls into water in case of emergency.

[Configuration and Function of Invention]

EMBODIMENT OF THE INVENTION Hereinafter, specific embodiment of this invention is described in detail with reference to drawings.

The production of a polyolefin foam sheet as a synthetic resin foaming agent having a fine independent bubble of the present invention can be produced according to the flute chart of FIG. That is, medium density polyethylene is used as polyolefin, Freon 12 is used as a blowing agent, and polyoxyethylene nonylphenyl ether is used as a surfactant (releasing agent), and it softens by heating at about 195 ° C, extrudes onto a sheet in an extruder, and foams Extruded from a flat nozzle, molded into an independent bubble foam sheet having a thickness of 0.04 mm or less through the rolls of calender, and passed between aged cooling rolls to a thickness of 0.04 _± 0.03 mm. The apparent density is a buoyant material of polyolefin foam sheet of 0.0251-0.0285 g / cm ³ .

The following test items were measured in accordance with the test method of JIS F 1206 "Floating Jacket for Ships" for the performance of this buoyancy material. The equipment used is a low temperature bath (PSL) buoyancy measuring device and a salt spray tester (ST-J).

1. Buoyancy test

The iron strips are suspended in fresh water and gradually increased to the product subjected to the exclusion of the inner air layer, and the weight of the iron strips (initial buoyancy) when the total molten state is reached is measured. After leaving time, the buoyancy is measured again and the rate of change of buoyancy is calculated.

2. Oil resistance test (material test)

At least ^three specimens of 125 cm3 or more were collected, and the initial buoyancy in the case (JIS K 2204) was measured, and after leaving for 24 hours, the buoyancy in diesel gas was measured again, and the change rate of buoyancy was calculated.

3. Salt spray test (material test)

^Three or more test pieces of 125 cm ³ or more were taken, the initial buoyancy in fresh water was measured, and the salt spray test according to JIS Z 2371 was performed for 24 hours, and the buoyancy in fresh water was again measured after washing to calculate the change rate of buoyancy. box.

4. Cold resistance test (material test)

At least 125cm ^{3 and} more than ^three test pieces were taken, the initial buoyancy in fresh water was measured, and after leaving for 1 hour in a thermostat of -30 _± 5 ℃, taken out to measure the buoyancy, and calculate the rate of change of buoyancy.

5.Heat test (material test)

At least 125 cm ^{3 and} more than ^three test pieces were taken, the initial buoyancy in fresh water was measured, and after leaving for 1 hour in a 60 _± 5 ℃ thermostat, it was taken out to measure the buoyancy and calculate the rate of change of buoyancy.

The test results are shown in Table 1 as Example 1. Moreover, the performance of the average thickness of the general polyethylene sheet which is a packaging buffer sheet marketed as the comparative example 1, and the apparent density of 0.2 g / cm <^3> was written together. As a result, the polyolefin sheet having the physical properties of the present invention showed good buoyancy, excellent oil resistance, water resistance, cold resistance, and heat resistance, and fluctuation of buoyancy was 5% or less.

Temperature at the time of measurement is 23-27 degreeC, and water temperature 20-24 degreeC.

As the buoyant material, a polyindependent foamable polyolefin foam sheet was prepared by using a polymer which gave a flexibility by graft-polymerizing EPDM oligomer to polypropylene and gave flexibility. The average thickness was 0.04 mm or less, and the average apparent density was 0.03 g / cm <^3> . Its buoyancy and other physical properties were evaluated by the JIS F 1026 test method, and shown in the column of Example 2 of Table 1.

Commercially available flexible polyurethane foams also have independent foam water repellency, and if they have the physical properties of the present invention, they exhibit the same buoyancy material as the polyolefin foam sheet. This buoyancy and other physical properties were evaluated by the test method of the above JIS F 1026 and shown in the column of Example 3 of Table 1.

Next, the long jacket shown in Fig. 2, the short jacket shown in Fig. 3, and the best shown in Figs. 4 and 5, respectively, were made using the buoyant material on the sheet having the fine independent bubbles of Example 1, respectively. The figure which showed what was overlapped as the unit of a hawk as the core material, and sewing.

Standard number of buoyancy materials according to the wearer's weight is shown in Table 2. In this case, the long jacket was quilted in the whole body 1 and the rear body 2, and the sleeve 3 and the pocket 4 were closed by sewing. The specification and design of the quilting 5 can be arbitrarily selected. Short jackets or vests increase the number of buoyant piles because of the small area of clothing. In the case of a short jacket, a buoyant mat surrounded by a mesh-type lining 7 attached to and detached from the back portion is provided to prepare buoyancy and warmth. The best is an opening and closing form by the zipper 10 in this case, and about 4 sheets of the center are also put in the flap 8 of the pocket. Further, in consideration of the design, a cutout portion 9 was formed in the whole body 1, and even the center was sealed as a sewing stitch. As can be seen in Table 2, but the main point of the number of overlapping to maintain and maintain a sufficient buoyancy with respect to the weight of the wearer, but not limited to these.

What is important here is that the buoyancy material, like conventional plotting jackets, is not completely covered with a tarp to prevent moisture. When falling into the water, the buoyancy must be in direct contact with the water. Therefore, the mesh cloth 7a is used for the hem of a jacket, or the lining mesh cloth is used.

In addition, in the above embodiment, the reference numeral 14 displayed on the garment of FIGS. 2 to 5 is a luminous display unit, and when people fall into the water at night, people who fall into the water by the luminous light reflected from the luminous display unit 14 easily. To identify and obtain them. The shape and shape of the luminous display unit 14 can be arbitrarily modified according to the type of clothing.

[Effects of the Invention]

The buoyancy material according to the present invention has a configuration that achieves a light and soft texture like ordinary clothes, and when used as a central material such as clothes, it is usually used as everyday clothes. It has excellent waterproofing, cold protection, and warmth, and in the event of a sea accident, the buoyant material acts as a life preserver, and has the effect of preventing human personality or belongings.

Claims (1)

In a foam sheet for buoyancy materials manufactured using polyethylene, a foaming agent, and a release agent, the foam sheet has independent bubbles, and the foam sheet has a thickness of 0.04 mm or less, and an apparent density of 0.002-0.2 g. Buoyant material for use in personal goods, characterized in that / cm ³ .

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