The utility model mainly comprises a concave mold with a variable cavity formed by a concave mold combination substrate, a concave mold assembly and a concave mold combination card board. The utility model is composed of a convex mold combined substrate, a convex mold assembly, a convex mold combined pallets, a cavity cutting assembly and Side cut composite plate consisting of a variable core punch. Mold convex, die and auxiliary forming system of coordination changes. Machinable different shapes, different sizes of plastic series.
In order to improve the performance of plastics, but also add a variety of auxiliary materials in the polymer, such as fillers, plasticizers, lubricants, stabilizers, colorants, etc., in order to become a good performance plastic.
1, synthetic resin is the most important component of plastic, its content in the plastic is generally 40% to 100%. Due to the large content, and the nature of the resin often determines the properties of the plastic, it is often regarded as a synonym for plastic. For example, polyvinyl chloride resin and polyvinyl chloride plastic, phenolic resin and phenolic plastic confused. In fact, resin and plastic are two different concepts. Resin is an unprocessed virgin polymer that is used not only for plastics, but also for paints, adhesives, and synthetic fibers. In addition to a very small part of the plastic containing 100% of the resin, the vast majority of plastic, in addition to the main component of the resin, but also need to add other substances. 2, also known as filler packing filler, which can improve the strength and heat resistance of plastics, and reduce costs. For example, adding phenolic resin wood powder can greatly reduce the cost of making phenolic plastic as one of the cheapest plastic, while significantly improving the mechanical strength. Fillers can be divided into two types of organic fillers and inorganic fillers, the former such as wood flour, rags, paper and various fabric fibers, the latter such as glass fiber, diatomaceous earth, asbestos, carbon black and so on.
3, plasticizer plasticizer can increase the plasticity and softness, reduce brittleness, easy processing of plastic molding. Plasticizers are generally miscible with the resin, non-toxic, odorless, light, heat-stable high-boiling organic compounds, the most commonly used phthalates. For example, when producing polyvinyl chloride plastic, soft polyvinyl chloride plastic can be obtained if more plasticizer is added. If no or less plasticizer is added (less than 10%), rigid polyvinyl chloride plastic .
4, stabilizer In order to prevent the synthetic resin in the process of processing and use of light and heat decomposition and destruction, extend the service life, to be added to the plastic stabilizer. Commonly used stearate, epoxy resin and so on.
5, colorants Colorants can make plastic with a variety of bright, beautiful colors. Common organic dyes and inorganic pigments as colorants.
6, Lubricant The role of lubricant is to prevent the plastic in the molding does not stick to the metal mold, while plastic surface can be smooth and beautiful. Commonly used lubricants are stearic acid and its calcium and magnesium salts. In addition to the above additives, the plastic can also add flame retardants, foaming agents, antistatic agents.