Three Types of Blowing Moulding Processes

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More information about Three Types of Blowing Moulding Processes, please visit Bottle Blowing Machine Manufacturer

Plastic Blow Bottle Machine is a special machine where plastic materials (polyethylene, polypropylene, nylon, PET) are melted and formed together in this machine and with the help of heat and air pressure blown from the Bottle Machine outlet to produce various plastic products such as bottles, jars, containers, etc with the help of mold die.

During the blow molding process, the raw plastic material is shaped into a hollow tube with one open end called a parison. The parison is pressed into a cooled metal mold and compressed air is forced into the parison. When the formed plastic cools and hardens, the metal mold opens and expels the product.

There are three types of blow molding processes:

  1. Injection Blow Molding

In injection blow molding, a blow or core rod is used throughout the process. First a parison is injected into a split mold cavity around the rod. The parison that is formed looks similar to a test tube. The core rod transfers the parison to the blow mold machine where forced air creates the final shape. The rod then transfers and extrudes the finished product from the machine.

  1. Extrusion Blow Molding

Extrusion blow molding can be continuous or intermittent. In continuous extrusion blow molding, a parison will be constantly fed into the mold and each form will be cut off with a blade as it forms. Intermittent extrusion blow molding expels each new plastic from the metal mold when it is cooled and the parison is fed into the mold only after the preceding parison is expelled.

Extrusion blow molds are generally much less expensive than injection blow molds and can be produced in a much shorter period of time. Extrusion blow molding is appropriate for smaller runs. Advantages include cost savings on tooling and shorter production time while disadvantages usually include lesser control of wall thickness and greater amount of scrap material.

  1. Injection Stretch Blow Molding

Injection stretch blow molding combines the injection molding and blow molding processes. The plastic is first molded into a solid preform, to create a threaded bottle neck.

Once the preform cools it is fed into a stretch blow mold machine. The preform is then reheated using an infrared heater and blown into a plastic bottle with forced compressed air.

More information about Three Types of Blowing Moulding Processes, please visit Bottle Blowing Machine Manufacturer