Plastic products production process-details determine success or failure
The structure of the nozzle bag is mainly divided into two parts: the nozzle and the self-supporting bag. The structure of the stand-up pouch is the same as that of the ordinary four-sealed stand-up pouch, but composite materials are generally used to meet the requirements of different food packaging. The suction nozzle is a device specially used on composite packaging bags. A hard mouth made of high-density polyethylene (HDPE). The nozzle part can be regarded as a general bottle mouth with a straw. The two parts are tightly combined to form a beverage package that supports smoking, and because it is a flexible package, there is no difficulty in smoking, and the content is not easy to shake after sealing, which is a very ideal new beverage package.
Plastic processing technology is the general term for various processes that convert synthetic resins or plastics (semi-finished products) into plastic products. Plastic molding processing is an engineering technology that involves various processes that transform plastics into plastic products. One or more of the following situations often occur during the transformation process, such as the rheology of polymers and changes in physical and chemical properties. It is a large production sector in the plastics industry.
Plastic products production process: According to plastic processing principles to classify them, they can be divided into injection molding, blister molding and blow molding.
Injection molding: Injection molding is a method of manufacturing plastic products. The molten plastic is injected into the plastic product mold by pressure, and the cooling molding is used to obtain various plastic parts. It is suitable for large-volume and high-precision products. The price of the mold depends on the specific The situation varies.
Blister: After the plastic sheet is heated, the plastic sheet is sucked into the shape of the mold under the action of a vacuum through the mold, and cooled to form. It is suitable for products with simple structure and small quantity, and the mold is cheaper.
Blow molding: Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of the thermoplastic resin is placed in a split mold while it is hot (or heated to a softened state). After the mold is closed, compressed air is injected into the parison to blow the plastic parison It expands and clings to the inner wall of the mold, and after cooling and demolding, various hollow products are obtained.
In addition to polymers, raw materials used in plastics processing are generally added with various plastic additives (such as stabilizers, plasticizers, colorants, lubricants, reinforcing agents, and fillers, etc.) to improve the molding process and the use of products Performance or reduce the cost of products. Additives and polymers are mixed and uniformly dispersed into powder, also known as dry blends. Sometimes the powder needs to be plasticized and processed into pellets. Such powders and pellets are collectively referred to as batch materials or molding compounds.
Molding is a key link in plastic processing. Various forms of plastics (powders, pellets, solutions or dispersions) are made into products or blanks of the desired shape. Its choice is mainly determined by the type of plastic (thermoplastic or thermosetting), the initial form, and the shape and size of the product. The commonly used methods for processing thermoplastics include extrusion, injection molding, calendering, blow molding and thermoforming. The processing of thermosetting plastics generally uses compression molding, transfer molding, and injection molding. Laminating, molding, and thermoforming are forming plastics on a flat surface.
The last is surface modification, the purpose is to beautify the surface of plastic products, usually including: mechanical modification, that is, using files, grinding, polishing and other processes to remove burrs, burrs, and size correction on the parts; finishing, including coating the parts with paint Surface, use solvent to brighten the surface, use patterned film to cover the surface of the product, etc.; apply color, including color painting, printing and hot stamping; metal plating, including vacuum coating, electroplating, and chemical silver plating. Hot stamping is to transfer the colored aluminum foil layer (or other patterned film layer) on the hot stamping film to the part under heating and pressure.
