Injection Blow Molding Vs Extrusion Blow Molding

Both injection blow molding and extrusion blow molding processes are integral in many manufacturing applications. These techniques are used to create many disposable and recyclable plastic parts, including products used in medical and research applications. Both processes feature unique functions to produce different results, which is why it’s important to understand each process to determine which is suitable for manufacturing a particular product. To help you better understand the differences between injection blow molding and extrusion blow molding, we’ll go over how each process works so that you can determine which is best for your needs.

What is Injection Blow Molding?

Injection blow moulding process can be separated as injection moulding process and blow moulding process.

1. Injection molding process: The injection molding is finished by a plastic injection molding machine. In this process, we will produce a semi-finished product called preform or parison. The raw material is melted in a barrel and fed to the nozzles, injected into an injection mold, then we have the perform with kinds of bottle neck types.

2. Blow Moulding process: Blow molding is when we put the performers or prisons to a blowing mold and use high-pressure air to blow it up as bottles or other hollowed containers.

The injection blowing molding process can be finished with horizontal injection-blowing molding machines. This optimized injection blowing moulding system can be run with 28 cavity molds of tablet bottle mold in about 25 seconds of cycle time. This is high speed, energy-saving and stable for 24 hours running. Can beat the production line running vertical injection blow molding machines and extrusion blow molding machines very easily, but the investment cost is lower.

What is Extrusion Blow Molding?

Extrusion blow molding process starts from the material is melted and plasticized in the barrel. And then extruded from the head of the extruder with the conventional downward tube. When the tube parison reaches a predetermined length, a section of the tube embryo is intercepted and placed in the blow mold while still hot. The mold is closed catching and holding the neck end open and pinching the bottom end closed. the compressed air is blown into the parison through the air-blowing nozzle. The tube prison will be precisely inflated to the desired shape of the mold cavity. After the mould is completely cooled and then mold can be opened to take out the product.

The Key Differences Between Injection and Extrusion Blow Molding

In general, the biggest difference between the injection molding process and the blow molding process lies in their process, raw materials, and applications. If you want to buy blow moulding machine in China, feel free to contact us if any questions.

Blow molding uses gas pressure to make the hot blanks, close in the mold blowing into hollow products, or tube blanks without mold blowing into tube film. Injection molding, on the other hand, melts the plastic material and then injects it into the film cavity after molding.

Speaking of raw materials, Blow molding uses raw materials like polyethylene, polyvinyl chloride, polypropylene, polystyrene, thermoplastic polyester, polycarbonate, polyamide, cellulose acetate, and polyacetal resin. Among these, polyethylene is the most used. Injection molding uses raw materials like thermoplastic or thermosetting materials.

Blow molding is widely used in bottles, jars, baby products, sporting goods, and other industries. Injection molding is widely used in cell phones, portable computers, many kinds of plastic housings, communications, micro motors, computers, electrical appliances, electronics, toys, clocks and watches, lighting, locomotives, and other industries.

Comparison between Extrusion Blow Moulding and Injection Blow Moulding:

Extrusion Blow Moulding	Injection Blow Moulding
More easy for production	More difficult to produce
One step forming process	Two steps forming process
Lower cost	Higher cost
Recycle Materail is used	Mostly Brand new material
Multi-layers	One layer only
Product size from few ml up to hundreds liters	Product size from few ml up to dozens liters
Slow production	Fast production
Cheap or good quality	Good quality only
Bigger leaking risk	Smaller leaking risk
Have parking lines	Almost no parking lines
Poor precision	Better accuracy
Have flash and trimming	No flash and trimming
Not Energy Saving	Energy Saving
Thickness depends on extrude head/parison controller	Thickness depends on the core and cavity of the mold
Only one set blowing mold	Have injection mold and blowing mold
All cool runner mold	cool and hafe hot runner mold
More difficult for automatic running	Easy for automatic running
Cavities number depends on die-head number	Cavities number depends on mold cavities
Wide range of materials	Narrow range of materials

Partner with YOULI

It is important to consider your product when determining whether injection blow molding or extrusion blow molding is right for your needs. At YOULI we can help determine which process is best suited for your application. With our extensive experience manufacturing a variety of bottles, tubes, and other consumables, we are here to help guide you with your packaging needs from design to production. Contact us today.

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The customization capabilities of blow molding enable tailored solutions for specific industry requirements.

The process of blow molding can be integrated seamlessly into existing manufacturing workflows.

The process is widely used for producing bottles, containers, and other hollow products.

Blow molding enables the production of complex geometries without the need for secondary assembly processes.

Blow molding's versatility extends to producing intricate shapes with intricate details and features.

Blow molding's low tooling costs make it an attractive option for short-run production and prototyping.

Blow molding's ability to produce large parts with minimal material waste contributes to sustainability efforts.

The use of advanced materials in blow molding enhances product performance and durability.

Automated blow molding lines can be configured for lights-out production, maximizing efficiency and uptime.

Accumulator-head machines are suitable for producing large parts with consistent wall thickness.

Innovations in blow molding machinery aim to reduce cycle times and increase throughput.

Blow molding enables the creation of nested parts, optimizing storage and transportation efficiency.

In plastic manufacturing, extrusion and injection blow molding have unique strengths and applications. Extrusion blow molding excels in producing larger, simpler shapes, making it ideal for high-volume production of items like bottles and containers. On the other hand, injection blow molding shines when it comes to creating smaller, more intricate products with a polished finish, often found in pharmaceutical and cosmetic packaging.

Choosing between these processes ultimately depends on the specific requirements of your product and your production goals. Understanding their differences is critical to making an informed decision and achieving the best results for your plastic manufacturing needs.

YOULI offers a full range of injection and blow molding machinery as well as industry-leading expertise to advise all clients about the best solutions specific to their needs. YOULI serves a broad range of industries globally and can fulfill any client requirement for blow molding and injection molding equipment. All inquiries are welcome.