In recent days, the helmet suddenly caught fire, and the price increased from dozens of yuan to one or two hundred yuan, not only the price soared but also the goods were out of stock. We have to admit that the correct wearing of safety helmets is very important for the protection of electric vehicles and motorcycles, so the quality of safety helmets must be foolproof. As a small detective in the mold temperature machine industry, I will come here today Helmet manufacturer The application of mold temperature machine in the production process.
Helmets generally include shell, buffer layer, inner lining, jaw protection, lace, lens, etc. The application of mold temperature machine in helmet manufacturing mainly includes the following three aspects:
1、 Helmet shell molding
The shell is the outermost layer, which bears and disperses the impact during impact, so the material selection of helmet shell is the most important. Generally, most of the materials are ABS (industrial plastics), which are molded by injection molding. The mold temperature machine improves the production efficiency and the appearance quality of the shell by controlling the mold temperature, making the injection molding process faster and shorter. The helmet shell of engineering plastic injection molding is heavy, with poor safety performance and low added value in the market.
The high-grade helmet is a molded shell made of fiberglass, resin and fiberglass, commonly known as the fiberglass composite shell. In the production process, the material is placed in a steel mold, and the glass fiber material is placed in the outer casing to form a reinforcing layer, and then the unsaturated polyester resin or vinyl resin is evenly coated inside the outer casing. Then, the mold is heated by the oil circulation mold temperature machine, and pressurized within the temperature range of 110 ℃ 140 ℃. Unsaturated resin and glass fiber materials are solidified and formed, and the unsaturated polyester resin or vinyl resin and glass fiber are combined with the housing shell as a whole.
Glass fiber reinforced material is a material composed of glass fiber and one or more thermosetting or thermoplastic resins. It has many advantages, such as light weight, high strength, anti-corrosion, thermal insulation, insulation, sound insulation, etc. This new composite material is lighter and stronger than ABS, but it is also more difficult to make, and its output is lower. Some are better made of carbon fiber and aramid fiber, but the price is relatively more expensive. The shell made of composite helmet has high safety strength, light weight, strong weather resistance and high market added value. It is commonly used in racing and military industries.
2、 Helmet lining
Most helmet linings are made of EPS (Expanded Polystyrene), which is a very common shock absorption material. The role of the lining is to absorb impact, and absorb impact generated by collision at the cost of permanent deformation. EPS foam lining with excellent cushioning and shock-absorbing effects can greatly reduce the damage to riders caused by riding accidents.
EPS foaming process is called expandable bead molding process, that is, in an autoclave, the physical foaming agent is dipped into the fine particles of the matrix resin at a predetermined temperature through high pressure within a certain period of time, and then the system temperature is cooled to room temperature to obtain expandable beads.
When in use, at a certain foaming temperature, use steam or hot air to pre foam the expandable beads to obtain mung bean sized pre foaming expandable beads. When preparing helmet lining products, the pre foaming expandable beads are put into the mold and heated by the mold temperature machine to further expand and fuse the pre foaming expandable plastic beads to form a foaming material of predetermined shape.
3、 Helmet protective lens
The goggles can protect the eyes and face. The materials of goggles generally include plastic, reinforced resin, and the scratch resistance of reinforced resin is much better than that of ordinary plastic. Lens mold belongs to high-precision plastic mold, whose surface shape is complex, and its precision requirements are high, so it has higher requirements for mold temperature in the molding process. High temperature water mold temperature machine is usually used for lens forming, which is characterized by fast temperature rise, high efficiency and uniform temperature.
The application of mold temperature machine in the manufacturing process of helmet manufacturers is introduced here. It is recommended that everyone buy helmets with good materials, because inferior helmets are easy to break when encountering a huge impact, which increases the potential safety hazard.
