Plastic mold It is the abbreviation of a combined mold used for compression molding, extrusion molding, injection molding, blow molding and low foaming molding. A series of plastic parts with different shapes and sizes can be processed with the coordinated changes of the convex and concave dies of the die and the auxiliary molding system.

Plastic mold is the mother of industry, and the release of new products will involve plastic.

Plastic mold structure editing

It mainly includes a concave die with a variable cavity, which is composed of a concave die combination substrate, a concave die assembly and a concave die combination card, and a convex die with a variable core, which is composed of a convex die combination substrate, a convex die assembly, a convex die combination card, a cavity cutting assembly and a side section combination board.

In order to improve the performance of plastics, various auxiliary materials such as fillers, plasticizers, lubricants, stabilizers, colorants, etc. should be added to the polymer to become plastics with good performance.

1. Synthetic resin is the main component of plastics, and its content in plastics is generally 40%~100%. Because of its high content and the nature of resin, people often regard resin as a synonym for plastic. For example, PVC resin and PVC plastic, phenolic resin and phenolic plastic are confused. In fact, resin and plastic are two different concepts. Resin is a kind of raw polymer, which is not only used to make plastics, but also raw materials for coatings, adhesives and synthetic fibers. In addition to a few plastics containing 100% resin, most plastics need to add other substances besides the main component resin. 2. Filler, also known as filler, can improve the strength and heat resistance of plastics and reduce costs. For example, the addition of wood flour to phenolic resin can greatly reduce the cost, making phenolic plastic one of the cheap plastics, and at the same time can significantly improve the mechanical strength. Fillers can be divided into organic filler and inorganic filler. The former is such as wood powder, rags, paper and various fabric fibers, while the latter is such as glass fiber, diatomite, asbestos, carbon black, etc.

3. Plasticizer Plasticizer can increase the plasticity and softness of plastics, reduce brittleness and make plastics easy to process and shape. Plasticizers are generally high boiling organic compounds that are miscible with resins, non-toxic, odorless, and light and heat stable. For example, when producing PVC plastics, if more plasticizers are added, soft PVC plastics can be obtained; if no or less plasticizers are added (dosage<10%), hard PVC plastics can be obtained.

4. Stabilizer In order to prevent the synthetic resin from being decomposed and destroyed by light and heat during processing and use, and to extend its service life, a stabilizer should be added to the plastic. Stearate and epoxy resin are commonly used.

5. Colorants Colorants can make plastics have various bright and beautiful colors. Organic dyes and inorganic pigments are commonly used as colorants.

6. The function of lubricant is to prevent the plastic from sticking to the metal mold during molding, and to make the plastic surface smooth and beautiful. Common lubricants include stearic acid and its calcium magnesium salts. In addition to the above additives, flame retardant, foaming agent, antistatic agent, etc. can also be added into the plastic