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Safety protection

On the production technology of domestic and foreign safety cap

点击次数:  信息来源:  发布时间:2020-05-29 14:16:46  【打印此页】  【关闭
Safety hat as a head by falling objects or other specific factors that cause the damage to the natural person, the personal protective equipment (PPE) is attracting more and more attention of all countries in the world, safety door industry. Especially in the developed countries, continuous technological innovation, update the standard of safety helmet, and the safety cap product is more safe, comfortable, lightweight, beautiful, personalized, and further protect the worker safety and individual needs.

1 materials and properties of safety cap
Production safety cap material has a lot of, at present domestic and foreign production safety cap shell commonly used materials are: ABS, HDPE, PC material, FRP materials; the internal structure of the cap hoop, mainly by LDPE, PA and other material production; top lining by HDPE or sponge composite nylon material production and sweat bands made of PVC film, acrylic or towel sponge cloth composite materials, acrylic and polyester belt do corresponding cap hoop connecting piece. Now the world production of several main security caps briefly as follows: (according to international practice to safety helmet shell material classification)

1.1 ABS safety helmet
The full name of the ABS plastics for acrylonitrile - butadiene - styrene resin, namely the abbreviation of English acrylonitrile butadiene styrene, the engineering plastics with heat, high surface hardness, dimensional stability, good chemical resistance. And electrical insulation performance is good, is seldom affected by temperature and humidity, but also can keep constant in a large frequency range. In addition, its chemical properties are very good, the water, inorganic salt, alkali and acids almost no effect.
The impact strength of ABS material is good, and it will not decrease at low temperature. , of course, for safety cap production materials, mainly using super high impact ABS material, otherwise impact testing for unqualified. This kind of material in addition to North American countries do not have such a small part of the material production safety helmet, widely used in other countries.

1.2 HDPE safety helmet
HDPE plastic for high density polyethylene (high density polyethylene) material, this material has high surface hardness, good heat resistance, electrical insulation resistance and dimensional stability, widely used in the production of safety helmet. But the compressive strength of the material is poor, if the inner part of the helmet shell         structure and wall thickness design without improvement, often lateral pressure test is not qualified, so this material safety helmet brim must to strengthen the anti pressure design, otherwise in Europe, Australia, Japan and China standard is difficult to get through. Because there is no pressure the North American Standard, so safety cap for HDPE is widely used in America, and in Japan, South Korea and other countries basically without HDPE production safety helmet.

1.3 PC safety helmet
        PC plastics polycarbonate (polycarbonate) material, this material is steel hard and tough, with high impact resistance, high dimensional stability, good electrical insulation properties and high temperature resistance performance. Because of its high cost of materials, the material is rarely used in other countries except for Japan. , of course, because the PC has some special material resistance temperature performance good, a lot of metal smelting industry needs the resistant high temperature PC safety helmet.

1.4 FRP safety helmet
        FRP materials for glass fiber reinforced plastics, referred to as ReinforcedPlastics Fiberglass (glass fiber reinforced plastics). This material fiber has high strength, heat and electrical insulation with excellent performance, but also has excellent acid and water resistance, flame retardant, deformation characteristics of small, in the countries all over the world have this material safety helmet. But because of this kind of composite thermosetting resin, in the production process has a lot of waste, scrap and safety helmet use after the garbage collection is difficult to handle, causing environmental pollution, does not meet the low carbon economy. Therefore, the developed countries in Europe and America are gradually reducing the production of this material.

1.5 other safety cap
        In addition to the above four kinds of a lot of material production safety helmet and the following safety helmet, mainly produced in China, in foreign security cap production enterprises and show almost nothing to see.
(1) safety helmet with adhesive rubber and canvas tape hot pressed into the safety helmet.
(2) cold proof safety helmet: sandwich with a plastic shell, the shell is made of sheep shearing velvet, plush production of cold resistant safety cap, suitable for winter protection.
(3) safety helmet safety helmet: bamboo as raw material with bamboo pole.
(4) To Liujo: this kind of safety helmet helmet cap with a cane or wicker woven material, but the flame retardant effect is poor.
(5) aluminum safety helmet: individual household aluminum die-casting mold factory production of aluminum safety cap.

2 safety cap mold technology
        Mold is the most important process equipment in safety production of caps, which is the main tool molding safety helmet casing and accessories. Its structure and processing precision of safety helmet product quality and production efficiency has a very important factors.

2.1 mold material
        For the main production safety cap mold material made of steel, there are also individual use of non-ferrous metal or non-metallic materials. 30 years ago, due to the science and technology is not developed, both at home and abroad are generally used 45# steel and 40Cr carbon tool steel material production safety cap and fittings mold, but the use of the production of steel products, the brightness difference, size precision is low, the service life of the mould and other shortcomings. With the development of science and technology, some high hardness, sliding wear resistance, good resistance to corrosion resistance of new varieties of steel will continue to appear, the safety cap product precision and smooth degree is greatly improved, enhance the entire industry level. At present, Japan for the green and the Jackson and safety supplies company. In general, the high strength, high toughness, 718, pu9794, 2316 alloy tool steel production safety cap injection mold is, and the product has high smoothness and precision, prolong the service life of the die can reach more than 200 million times. In recent years, the domestic safety helmet manufacturers, whether it is producing their own or entrust mold factory safety cap mould making, also from the original medium carbon steel and gradually use P20, 718 steel. Manufacturers of high quality requirements, most of the Hong Kong LKM standard mold manufacturing mold, effectively ensure mold precision, high efficiency and long service life.

2.2 mold processing technology
        The traditional mold production, often by the designer's experience and the existing design data, from the process of safety helmet calculation to mould design drawing, all rely on manual labor, in the mold production, relying on with skill and heavy fitter labor, with the common processing of ordinary lathe, planer, milling machine, grinder, such as machine tool, the finishing size precision, the quality of the products are far from meeting needs of production development. For nearly 20 years, the world mold industry is developing very fast, with the wide application of CAD / CAM / CAE by advanced three coordinate measuring instrument, NC and CNC machine tools, machining center, high-speed milling and other advanced machine tool processing technology, thereby improving the size precision of the mold for the use of the quality and safety helmet. Such as Jackson in the United States, Japan's green safety Kaisha, French SPERIAN, after several years of development, because of China's mold manufacturers to meet customers "high quality, short time, low price" requirements, so there are many foreign safety helmet manufacturers commissioned the China die production enterprises.

2.3 hot runner technology
        Safety helmet early, cold runner structure commonly adopted, one injection gate mark outside the safety helmet shell, affecting the appearance. With the further development of mould technology, developed countries are beginning to use hot runner structure of mold manufacturing, injection molding gate in the cap shell inside, the safety cap product appearance is more beautiful. Cap hoop and other parts of the production, can save the gate waste, save energy.

2.4 degree of automation
        With the improvement of science and technology, injection molding machinery and automation of the further development of, Japan and other advanced countries, injection molding machine and automatic shearing gate device, intelligent packaging line and applied to the safety cap production, moulded glass fibre reinforced plastic safety cap automation system also made great development, promote the progress of the safety cap industry as a whole. With the development of society, the increase of labor cost, automation of production safety cap products, will be the development direction of the industry.

3 domestic and international safety cap standard difference
        As an important safety protective equipment, all over the world, all countries attach great importance to it. The international organization for standardization early in 1977 develop ISO3873:1987 "industrial safety cap, production standards, technical requirements specified in this standard is widely national safety cap used in the industries. With the progress of the times, China, Britain, France, Germany, the United States, Canada, Australia and New Zealand, Japan, Singapore, Malaysia and other according to their own actual situation, successively formulated a new safety cap standards. And Kenya, Africa and other countries, has been performed ISO3873, such as China safety cap exports to the country is entrusted to the SGS testing agencies according to the acceptance criteria, and issue the test report, party can entry.
A list of the main testing items of the safety cap standards for a representative country is as follows (see next page):
In addition to the list of national safety helmet standards, as well as Singapore SS98, French NFS72-202, the German DIN4840 standards. A comprehensive view of the world, European and African countries mainly uses the standard CE, North and South America mainly uses the ANSI, CSA Standard, South Korea and Japan mainly uses Standard JIS.

4 international certification of safety helmet
        Safety helmets products as an important safety protection products, countries have the appropriate access threshold, if not obtained in accordance with the standards of the corresponding certification to in the country were sales and use. At present, in addition to the production license and safety certification mark access system, South Korea, with permission and registration system, the certification of other countries is through its authorized independent third party certification body, is detected according to the standard of the safety helmet of the country, made qualified after issue test report or certificate before sale, a copy of the test report and certificate only recognized the same style, same material safety helmet, can not cover other styles or different materials of cap type.

4.1 CE certification
        The EU CE certification, in the EU market is a mandatory certification, whether in the EU enterprises produced products, or other countries in the production of products, to the free circulation in the EU market, have achieved CE certification. At present, authorized the TUV Rheinland Group (European Union Bulletin No.: 0197 CE certification for safety cap), British inspec detection mechanism (European Union Bulletin No.: Levis).

4.2 GS certification
        Germany GS certification, is a sign of German security certification. GS certification of factory quality assurance system has strict requirements annually to review and inspection of the factory, also on the safety cap products all parts to PAHs (aromatic hydrocarbons) limit test, the requirements of all the parts without the possibility of cancer. At present, can do a safety helmet GS certification testing organizations, only the German Rhine TUV group.
4.3 ANSI certification
The United States ANSI safety helmet standard and CSA Canada standard content is basically the same, and the mutual recognition in other countries. In 1894, American Security Testing Laboratory of UL company, is the main safety testing and certification organization ANSI, CSA standard. Achieve UL certification, safety cap products will get highly recognized by the United States, Canada, consumers, but UL certification of quality assurance requirements are particularly high, every year 4 times to plant are reviewed. Of course, founded in 1878, SGS SGS group can also test for the ANSI safety cap, but they can only do g, grade C, but cannot do e grade electrical insulation test.

4.4 AS/NZS certification
        Australia, New Zealand AS/NZS helmet standard, these two countries jointly formulate the standard of occupation protection committee. At present, to authorize the AS/NZS safety helmet standard certification agencies have the British Standards Institute BSI group, Taiwan ICS laboratory.
Reference
[1].The national standard of the people's Republic of China, "1" 2811-2007 GB "safety helmet"
[2].The national standard of the people's Republic of China, "2" 2812-2006 GB "safety cap test method"
[3]. "plastic material Handbook" Luo Hesheng.
[4].397:1995 EN "technical specification for industrial safety cap" EU standard
[5].3873:1987 ISO "industrial safety helmet" international standard
[6].Z ANSI 89. 1 "industrial safety helmet" American national standard
[7].1801: AS/NZS 1997 "occupational safety helmet" Australia / New Zealand Standard
[8].183: MS 2001 "technical specification for industrial safety cap" Malaysia standard
[9].T 8131: JIS 2000 "industrial specifications industrial safety cap" Japan national standard

    Description: the Zhejiang Naite Technology Co., Ltd., general manager of Jiang Xuri the as, published in 2010 in the "China personal protective equipment".
    Welcome hat industry in Tongren technology exchange, the company's external processing manufacturing conform to GB \ European standard ASTM \ all safety cap injection mold.


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