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
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