At present, many injection mold processing manufacturers basically use bakelite injection molding machines and plastic injection molding machines. There are different differences between Dewei casting bakelite injection molding machines and plastic injection molding machines. Bakelite is PF (phenolic resin). Bakelite is an early industrialized plastic variety, which realized industrialized production in the United States in 1910. Let’s see what the difference is?
The raw materials for producing bakelite are mainly phenols and aldehydes, and phenol and formaldehyde are commonly used. They are obtained by polycondensation under the catalysis of acid, alkali and other catalysts. Industrial production mainly includes dry process and wet process.
Phenol and aldehyde can produce two kinds of PF under the action of different catalysts: one is thermoplastic PF and the other is thermosetting PF. The former can be cured into a body structure only by adding curing agent and heating, while the latter can become a body structure as long as heating without curing agent.
Whether thermoplastic pf or thermosetting PF, only the exchange network formed by curing can be used. The curing process is the continuation of the bulk polycondensation reaction and the formation of the final bulk product. This process is different from the melting and curing of general thermoplastic. It is irreversible, including both physical and chemical processes.
PF can be injection molded by a method similar to thermoplastic. Pf used for injection molding requires good fluidity, molding under low injection pressure, high thermal rigidity and fast hardening speed, good gloss on the surface of plastic parts, convenient demoulding and no pollution to the mold. However, injection molding also has its shortcomings. For example, the melt is limited by the type of filler, it is not suitable for molding plastic parts with more inserts, and a large number of gates and flow channels after curing can not be recycled and can only be discarded.
In short, thermoplastic PF can be produced by ordinary injection molding machine, but the process conditions must be strictly controlled. Thermosetting pf must be produced by PF special injection molding machine (barrel and screw are different from ordinary injection molding machine), and the mold must also use special design structure!
Sino Vision Vehicle & Service Co.,Limited, located in Huangyan Town, Taizhou, focuses on injection molding processing such as bakelite, BMC injection molding and precision plastic injection molding. Bakelite and BMC injection molding products are widely used in all kinds of kitchenware, electromechanical and home appliance accessories. The company has a strong engineering and technical team, which is committed to creating products with high quality and beautiful price for customers, which can meet various processing needs of customers.
Post time: Aug-23-2021