Blow molding is an industrial manufacturing technique for joining and shaping together hollow plastic polymers. In basic principle, there are mainly three types of blow molding available in the market today: injection blow molding, extrusion blow molding, and thermal blow molding. In each type, plastic polymers are melted and poured in molds which are heated by high-pressure steam or by a blow pipe. Once molded, they are cooled under pressure, hardened, and then hardened again. After that, the plastic pieces are welded together to form the final product.
The injection blow molding machines work by spraying the melted plastic pellets or by spraying the hot liquid nitrogen into the mold cavity. In the former, the pellets or liquid nitrogen are shot into the cavities one at a time. While in the latter, hot air is blasted into the mold and the melted plastic is sprayed in uniformly all over the mold. In both types, the size of the cavity is important because it determines the dimensions of the pellets or the hot liquid nitrogen, which determines the mold's shape. Different machines also come in different shapes and sizes.
While the three basic types all work in similar way, their operation and complexity vary greatly. Most injection blow machines come in single or two stages, although there are a few three stages machines as well. A high blow molding machine has the ability to perform preblows, which are essential for the proper breaking apart of the pieces of the mold.
It's obvious that the key to a successful blow molding process is its machinery; this includes the mixing/expanding chamber, the injection gun, the pre Blow molding machine, and the vacuum chamber. This equipment is essential to the entire procedure, since it is what transfers the power from the gun to the plastic to form it into a solid. The mixing/expanding chamber is where the heated air, the plastic powder, and the powdered material are mixed together in order to form the desired shape. It is important to note that when mixing the material, you must pour only enough material to completely fill the chamber so that there is no leftover material. This is very important as it prevents over filling and prevents the plastic from blowing out during the actual blowing process.
After the material has been mixed, the air blast unit injects it into the cavities and causes them to expand and contract until they have formed the required shapes. This part is where the manual dexterity comes in handy, because you have to manually manipulate the keys to start and stop the expansion and contraction process. In order to ensure that the plastic products have a full shine, the chamber must be left alone until they dry. If you leave the chamber for an extended period of time without it being emptied, the plastic could dry unevenly and/or become brittle.
Once the entire cycle has been completed, you will then manually trigger the trigger to send the plastic into the mold. This part is probably the easiest part of the whole operation to learn since it involves the least amount of machinery. The machine simply rolls forward and backwards in order to open and close the cavities and mold the plastic as needed. To further reduce any chance of a spill, you should place a sheet of plastic on the platform and then place the finished product inside of it. Since this type of molding can be used for a variety of plastic products such as signs, letters, and logos, it is an essential part of any business that produces goods in bulk.