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Plastic injection molding processing is also called plastic molding processing, it is the process of processing plastic or synthetic resin into plastic products, in the plastic production industry can be said to be one of the largest production sectors. Plastic processing is due to the development of synthetic resins and development, with the continuous improvement of science and technology, plastic processing technology has also been greatly improved. At present, it is mainly through the batching, molding, mechanical processing, joint, modification, and assembly of these steps. Let's take a look at its process in detail.  


Plastic injection molding processing flow


A, ingredients,


This is the first step of plastic processing technology, it needs raw materials in addition to the polymer, but also add some stabilizers, plasticizers, colorants, and other plastic additives, so that the processing of plastic products will be greatly improved, but also can reduce production costs. The polymer and auxiliaries are mixed together and dispersed into a dry mixture. It can also be processed into pellets.



Second, the molding


This is the most critical step in plastic processing, we need to make various forms of plastic into the desired shape of the embryo. There are many methods for this molding, and the choice is mainly based on the type of plastic, the starting form, and the size and shape of the product. If it is thermoplastic, extrusion, injection molding, calendering, blow molding, and thermal molding are generally used; If it is a thermosetting plastic, then it can be molded, transfer molded, or injection molded. In addition, there are liquid monomers or polymers as raw material casting.


Three, mechanical processing


This step can be regarded as an auxiliary process of forming. It can borrow the processing methods of metal or wood to make plastic products of precise size or small quantity. However, the performance of plastic and metal, wood, and other is completely different, in the process of mechanical processing tools and cutting speed, and so on must conform to the characteristics of plastic.


Fourth, the joint


This step is to join the plastic pieces together. There are two main methods: welding and bonding. The welding method is mainly hot air welding, hot melt welding, high-frequency welding, friction welding, ultrasonic welding, and so on. The bonding method is performed using adhesives, such as fluxes, resin solutions, and hot melt adhesives.


Five, the modified


The purpose of this step is to beautify the surface of plastic products, generally through mechanical modification, that is, grinding, grinding, polishing, etc.; Then is the coating, such as the coating on the surface of the parts, with a pattern of the film covering the surface of the products; There is also color, such as painting, printing and so on; There are also gold plating, including vacuum coating, electroplating, and chemical silver plating.

Six, assembly this is the final step in plastic processing, where individual plastic parts are put together to make a complete plastic product.



The most common Plastic injection molding processing process


Extrusion: Extrusion molding is also known as extrusion in plastic processing, and also known as extrusion in rubber processing. Refers to the material through the extruder barrel and the action between the screw, and the side by thermoplasticizing, the side is pushed forward by the screw, continuous through the head, and made into a variety of cross-section products or semi-products of a processing method. Extruded products are continuous profiles, such as tubes, rods, silk, plates, films, wire and cable cladding, etc. The extrusion products produced by Baoyi use a variety of different raw materials, among which the most commonly used are PC, ABS, PVC, PS, PE, PP, TPE, TPE, TPE, TPU, and so on. After the completion of processing, there are many plastic products in our life like LED lampshades, drain pipes, supermarket price tags, and so on. The processing technology is extrusion.


Injection molding: Thermoplastic injection molding, involves melting plastic material and injecting it into a membrane cavity. Once the molten plastic is in the mold, it is cooled and molded into a shape according to the cavity. Injection-molded products are also very common in our life. Our most common products mainly include computer case shells, connectors, mobile phone shells, keyboards, mice, stereos, etc.


Blow molding: also known as hollow blow molding, is a rapidly developing plastic processing method. Thermoplastic resin extrusion or injection molding of tubular plastic billet, hot (or heated to the softening state), placed in the open mold, immediately after closing the mold in the billet through the compressed air, the plastic billet blow and close to the inner wall of the mold, after cooling demold, that is, to get a variety of hollow products. The plastic processing technology used in bottles, buckets, cans, boxes, and all the containers for packaging food, beverages, cosmetics, medicines, and daily articles are blow molded.


In the process of plastic processing, it is inevitable to encounter a variety of problems, Plastic injection molding processing shrinkage problem is the most common and the most intractable one. Only by minimizing this problem can higher quality products be guaranteed. However, with the continuous improvement of plastic processing technology, I believe that this problem will be solved in the future.


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