The utility model mainly comprises a concave mold with a variable cavity which is composed of a concave mold combined substrate, a concave mold assembly and a common Yuzhuo plastic mold picture card plate which is combined with a concave mold, and is composed of a convex mold combined substrate, a convex mold assembly, Plate, cavity cut-off assembly and side cut composite plate composed 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 and to become a good performance plastic, but also add a variety of auxiliary materials in the polymer, such as fillers, plasticizers, lubricants, stabilizers, colorants, etc.
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 concept. 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.