Blow molding bottles

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,Injection Blow Moulding

Blow Molding Materials.
Raw thermoplastic materials are easily utilized within the blow-molding process when they come in the form of small granules or pallets, which are melted first and molded into a hollow tube(parison). There is a wide range of thermoplastic materials that can be used but the ones that are easy to make
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;

Stretch-Blowing Mold.

This process is purposely used to produce hollowed objects having bi-axial molecular orientation. This is important as the specific molecular orientation provides clarity, acts as a perfect gas barrier and provides enhanced physical properties needed in storing carbonated beverages or chemicals.
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.


This method is not only economical but also popular because it is known to produce high-quality holloed parts and products. If you want to produce rigid walled bottles or pipes, then this the method for you.
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At Sincere Tech Plastic Mold company, we are unwavering in our commitment to staying at the forefront of the industry, embracing future trends, and incorporating cutting-edge technologies such as injection blow moulding into our repertoire. We continuously explore advanced materials and composites that not only enhance performance but also prioritize sustainability, aligning with the evolving needs of our customers.

Our substantial investment in research and development empowers us to provide innovative solutions that push the boundaries of injection blow moulding technology. As one of the leading mould and die casting China suppliers, we take pride in our ability to deliver top-notch services that cater to the ever-changing demands of the market.

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Partnering with Sincere Tech for your injection blow moulding needs means experiencing the highest level of professionalism, expertise, and innovation. We are dedicated to assisting you in bringing your ideas to life, delivering superior products that excel in performance, durability, and cost-effectiveness.

Contact us today to discuss your project requirements and explore how our injection blow moulding services can elevate your manufacturing processes to new heights. Together, let’s unlock the full potential of injection blow moulding and create exceptional products that shape the world around us.