Requirements of plastic granulator for plastic composition

Plastic pelletizers have great requirements on the composition of plastics. The most basic component of plastic is resin, called matrix material. According to actual needs, plastic materials generally contain many other ingredients, called additives, which are used to improve the use performance or process performance of the material. Thermoplastics are sometimes used in pure resin form, while thermosetting plastics are used entirely in the form of additives.

There are many kinds of additives for plastic materials, including fillers, reinforcing agents, plasticizers, lubricants, antioxidants, heat stabilizers, light stabilizers, flame retardants, colorants, antistatic agents, curing agents, foaming And some other additives. The basic requirements for additives are functionally effective, stable under the conditions of plastic processing and use, stable in combination with resin, non-dialysis and blooming, non-toxic, tasteless, and affordable.

Dialysis refers to the migration of an additive in plastics to other materials in contact with it. Dialysis occurs because the additive has a certain degree of solubility in the matrix material resin, and can also have a certain degree of solubility in the material in contact.

Blooming refers to the migration of certain additives in plastics to the surface of the product, and generally refers to plasticizers and lubricants. When the additive is completely dissolved in the resin at the processing temperature, but only partially dissolved at room temperature, blooming will occur when the molded product is stored or used at room temperature. The composition of the plastic is different, and the processing degree of the plastic granulator is different.

Fillers are used to improve certain physical properties of plastics, such as thermal conductivity, expansion, heat resistance, hardness, shrinkage, dimensional stability, etc., sometimes to improve or to improve certain mechanical properties of the material, sometimes , The use of fillers is mainly to reduce the cost of materials.