Small injection molding machine It plays an important role in various manufacturing fields and is used to produce various plastic products. In the selection of plastic materials, thermoplastics and thermosetting plastics are two common types. They are very different in properties and processing methods. This article will discuss how small injection molding machines deal with these two types of plastics.
1. Thermoplastic:
Thermoplastic is a kind of plastic that becomes soft and plastic after heating up. This means that it can maintain its shape during multiple heating and cooling processes and can be reworked. Common thermoplastics include polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.
Small injection molding machines need to consider the following factors when dealing with thermoplastics:
1. Temperature control: The injection molding machine must be able to provide enough heating temperature to melt the thermoplastic. Too low temperature may lead to insufficient melting of materials, thus affecting the molding quality.
Injection time and pressure: Thermoplastic needs to be injected and compressed within a certain time to ensure that the mold is filled and forms the required shape.
Cooling system: After injection molding, thermoplastics need to be rapidly cooled to solidify and maintain the desired shape. The injection molding machine is usually equipped with a cooling system to control the cooling rate.
Mold selection: The mold design shall match the properties of thermoplastic plastics to ensure the precision and quality of finished products. 3、
2. Thermosetting plastics:
Thermosetting plastics are hardened after initial heating and cannot be reworked or melted. Once shaped, they retain their shape and nature. Common thermosetting plastics include phenolic resin, epoxy resin, unsaturated polyester resin, etc.
Small injection molding machines need to consider the following factors when dealing with thermosetting plastics:
Temperature control: thermosetting plastics need higher heating temperature to promote its curing. Too high temperature may cause material decomposition, while too low temperature may cause insufficient curing.
Injection molding time and pressure: the injection molding machine needs to provide enough pressure and time to ensure that thermosetting plastics are fully cured in the mold.
Cooling system: Although thermosetting plastics do not need rapid cooling, the cooling system still needs to be used to ensure the smooth demoulding of finished products from the mold.
Mold selection: The mold design shall adapt to the characteristics of thermosetting plastics and take into account the shrinkage during the curing process.
Small injection molding machines usually need to switch between thermoplastics and thermosets under different working conditions. This requires careful adjustment and cleaning to ensure that different types of plastic do not mix. At the same time, operators need to have a deep understanding of the characteristics of each type of plastic to ensure the quality and performance of finished products.
Lian Sheng Plastic injection molding machine To sum up, small injection molding machines need to be set and operated differently according to the nature of materials and processing requirements when processing thermoplastics and thermosetting plastics. The correct parameters and process flow will help to produce high-quality plastic products.
