Injection Blow Moulding
What Is Injection Blow Molding
Injection blow moulding is basically a series of processes involved in making hollowed plastic molding products and components. this injection blow molding process is one of the best molding processes for thin wall plastic molding containers. The three major processes are;
(1) Injecting a parison or thermoplastic into a blow mold to create a perform pipe at first (parison).
(2) Moving the perform pipe to blow mold and blowing the thermoplastic into a mold’s cavity to form a hollow molding part,
(3) Ejecting the final product. A wide range of hollowed injection molding products can be achieved through this method such as plastic bottles,
Polyvinyl chloride (PVC).
Polythene Terephtalate (PET).
High and low-density polyethylene (HDPE) and (LDPE) respectively.
Injection Blow Moulding Process.
There are 3 unique steps or processes involved during creating blow molded parts, they include;
The process is further subdivided into two distinct molding techniques. The one stage process requires the preform to be injected into the mold having properly conditioned temperatures and blown into the required containers—all under one continuous process. This method is effective where large production is not a priority.
The two-stage process: The preform is injected into the mold, where it is left for about 1 to 4 days and thereafter blown into containers. A re-heat blow(RHB) is a machine is used in this case. Typically, this process is costly compared to the one process technique but it is the best in mass production, for example, carbonated-beverage bottles.
Injection blow molding
The hot thermoplastic material is indexed and blowing into the mold while still on the pin. The bottle formed for instance is left to cool. It is then indexed and ejected at the next station. This stage or process allows neck finishing and threading at the mouth. The process is less concerned with the orientation enabling attaining more physical properties of the products.
Extrusion blow molding
This blow molding process commences with the conservation of an extruded prison tube. The prison is extruded between 2 halves of opened blow molds. Once the right length is attained, the molds close, holding the neck-end wide open while the bottom end is pinched and closed. A rod of the right diameter is then inserted on the neck end, while the poison is still hot to form the necessary threads. The molded bottle is then removed and excess material is trimmed from the pinch-off area at the bottom and neck areas.