What is the principle of mold injection


Molds, various molds and tools used in industrial produ […]

Molds, various molds and tools used in industrial production to obtain desired products by injection molding, blow molding, extrusion, die-casting or forging molding, smelting, and stamping. In short, a mold is a tool used to make molded objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the article by changing the physical state of the formed material, and is known as the "mother of industry".
With the development of my country's industrial manufacturing, after decades of accumulation of mold manufacturing technology, mold products have gradually been applied to all walks of life, showing a development trend of simultaneous expansion in vertical and horizontal depth. With the improvement of mold manufacturing technology and increasingly fierce market competition, mold products are gradually being widely used in transportation equipment represented by automobiles, and light industrial products represented by household appliances, consumer electronics and plastic products.

Molding can be precisely defined as giving a certain shape a specific shape in a molten or plastic state. Nowadays, due to its high durability, plastics have been widely used to replace traditional glass, wood and other materials. Various techniques are used to mold these plastics into the desired shape. Plastic injection molding is one of the cost-effective molding techniques available today.
A long history of plastic injection molding
The injection molding process is not a new concept. It was established in 1872. Through the introduction of plastic injection molding technology, the plastics industry's revenue has reached billions of dollars, of which 32% of all plastics are based on the weight of injection molding. This makes plastic injection molding the best molding method ever.
Principle of Injection Molding
Thermoplastics and thermosetting plastics are the two materials involved in the plastic injection molding process. Some of the polymers used in injection molding are epoxy resins and phenolic resins, which are thermoset plastics, while nylon and polyethylene are thermoplastics. In this process, the liquefied plastic is fed into a heated barrel, where the plastic particles are mixed and forced to form a mold cavity. Once completed, the molded cavity is cooled and then hardened. The plastic molding machine consists of a reciprocating screw used to mix plastic particles, while the movable pattern shapes the plastic into the desired shape, which occurs in the clamping part of the machine. The engineer designs the mold, and the mold maker makes the mold with aluminum or iron to make the required parts in a precision machine. Injection molding is widely used to manufacture various parts from small parts to entire parts of vehicles.
Plastic injection molding is used to produce many parts, such as bottle caps, containers, plastic combs, household appliances, and most other plastic products we use today. Injection molding is the only technology that can mass-produce many idle products, and it is also the most commonly used method in parts manufacturing. Lower labor costs, widely available materials, minimal scrap loss and repeatable high tolerances are some of the advantages of injection molding technology.