DescriptionInjection molding is an industrial productio […]
DescriptionInjection molding is an industrial production technique for creating parts by injection molding hot liquid material into a closed mold, or mold. The hot liquid may be in the form of a solid, gaseous or liquid substance injected into the mold at very high pressure. The most common materials used in injection molding are polyethylene, plastics, metals, and thermoplastics which are usually low pressure fluids injected into the molds at very high temperatures. Other materials used in injection molding are thermoset polymers and many thermoplastics that are specifically used to manufacture parts that need to be functional in a short period of time.
Processes injection molding machines use injection molding to manufacture plastic products. In the past plastic products could only be made by injection molding machines but currently any plastic product can be manufactured by using such machines. Plastic injection molding machines are controlled with a computer and the computer program and software to determine the design and other parameters of the products. One of the most popular injection molding machines is the polyethylene machine. This machine is used to manufacture plastic bottles, cans, tubes, sleeves, capstans, labels, cartons, bags, sleeves, bales, shipping cases, and other large items. Some polyethylene products are also used as building supplies as well.
Before injection molding the mold maker must first create the cavities that will house the molds. If the cavities do not have the right specifications or if there are materials that interfere with the molding process then the mold maker will need to change these cavities. Once the cavities have been created then material selection must be done, unless the material is capable of filling the cavities.
Next the plastic parts or item to be molded must be drawn and scaled down to proper sizes. The injection molding companies must then create the design guidelines and drawings for the pieces. These design guidelines and drawings are typically used in conjunction with CAD software and computer aided design programs. Once the design guidelines and drawings are complete the plastic parts are manually assembled.
There are several methods of feeding melt into mold cavities. The most common method is called injection molding bounce. This method involves pouring the melted plastic material from a cylinder into the cavities. Another common method is known as vacuum injection molding. This method feeds the melted material into the mold only when the air pressure in the mold becomes low enough to prevent solidification of the liquid.
The plastic pieces are melted in their molds under pressure until they reach their required shapes. Once the desired shape is achieved, the mold is removed from the injection molding machine and the pieces are drawn again using the appropriate drawing tool. Finally, they are manually welded together. The entire process of manufacturing plastic products can take up to three days.