Extrusion Blow Molding Vs Injection Blow Molding

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The blow molding process and the injection molding process are both plastic production processes. If you observe carefully, you will find that there are obvious differences in principle between the two. This article will introduce you to the advantages, disadvantages and differences between the blow molding process and the injection molding process.

 

 

What is Extrusion Blow Molding

In extrusion blow molding, plastic is melted and extruded into a hollow tube (a parison). This parison is then captured by closing it into a cooled metal mold. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container, or part. After the plastic has cooled sufficiently, the mold is opened and the part is ejected.

Advantages and disadvantages of extrusion blow molding

 

Advantages of extrusion blow molding

Disadvantages of extrusion blow molding

• It can produce a variety of products.
• It comes with low costs
• It allows for multiple methods of production
• It promotes a higher level of productivity
• It offers the benefits of automation

• It is highly dependent on petroleum.
• It creates a huge impact on the environment.
• It requires a lot of production methods.
• It comes with limited uses.
• It requires process and material precision that creates waste.

 

Common extrusion blow molding applications

Extrusion Blow Molding Products made by Extrusion Blow Molding Machines are milk or water bottles, shampoo bottles, automotive air ducts, jerry cans, and hollow industrial preform parts such as plastic drums or other plastic containers.

 

What is Injection Blow Molding

The process of injection blow molding (IBM) is used for the production of hollow glass and plastic objects in large quantities. In the IBM process, the polymer is injection molded onto a core pin; then the core pin is rotated to a blow molding station to be inflated and cooled. This is the least-used of the three blow molding processes and is typically used to make small medical and single-serve bottles. The process is divided into three steps: injection, blowing, and ejection.

Advantages and disadvantages of Injection blow molding

 

Advantages of Injection blow molding

Disadvantages of Injection blow molding

• Accurate shaping of the neck.
• A high level of dimensional accuracy.
• Mini weight tolerance.
• The highest quality surface finish.
• Production is absolutely free from waste.
• Crystal clear containers for pharmaceutical application.
• Finished bottle without weld line and scrap.
• Secondary /finishing operations can be avoided.
• Multi-cavities can be operated.

• The preform design generally establishes the core rod length & diameter.
• The process is more expensive than extrusion blow moulding.
• Compromise between preform wall thickness and blow-up ratio.
• The ratio of the maximum wall thickness to minimum wall thickness across a preform cross-section should be less than 1.5 to prevent weld lines.
• Preform thickness greater than 6 mm is unstable during blowing since the thick section cannot be properly conditioned.
• The technique is not suitable for manufacturing bottles with handles such as those used for detergent bottles.
• Since the injection moulds are required for each preform type of shape, the process is more expensive than the extrusion blow moulding.

 

Common Injection blow molding Applications

Blow molding can be used to create numerous types of parts. Parts produced from the blow molding process are generally plastic, hollow, and thin-walled. These types of products are regularly used and are available in a bevy of shapes and sizes. Some of these types of blow molded parts, include:

• Water & soda bottles
• Shampoo bottles
• Oil jugs
• Milk containers
• Storage tanks
• Plastic drums
• Tubs
• And more

 

The Difference Between Blow Molding and Injection Molding

Injection molding is currently suitable for almost all thermoplastics, and over the years, injection molding has also been successfully used to mold some thermosets. Injection molding has a short molding cycle, and the mass of molded products can range from several grams to tens of kilograms. It can form molded products with complex shapes, precise dimensions, and metal or non-metal inserts at one time. The method has strong adaptability and high production efficiency. 

Blow molding is widely used. It uses gas pressure to inflate a hot parison closed in a mold into a hollow product or a method of inflating a tube parison without a mold to form a tube film. This method is mainly used for the manufacture of various packaging containers and tubular films. As long as the melt index is 0.04~1.12, it is a relatively good hollow blow molding material, such as polyethylene, polyvinyl chloride, polypropylene, polystyrene, thermoplastic polyester, polycarbonate, polyamide, cellulose acetate, and Polyacetal resin, etc., among which polyethylene is used more

 

Professional Blow Molding Machine Manufacturer

MEPER is a leading blow molding machine manufacturer in China. Since 1998, we have been selling blow molding machines for overseas markets such as USA, Australia, UK, Canada, etc.

After years of hard work, we have now become one of the best blow molding machine manufacturers in China. Our blow molding machines are cheap and good quality. When you need a blow molding machine, please feel free to contact us.

How to choose fully automatic and semi-automatic blow molding machines?

 

For the bottle blowing machine, many people who are new to the plastic bottle industry need to know and learn a lot before purchasing. They need to buy according to their own needs. So do you choose fully automatic or semi-automatic? So what's the difference between a fully automatic bottle blowing machine and a semi-automatic bottle blowing machine?

How to distinguish between fully automatic and semi-automatic blow molding machines?

First, the difference between a fully automatic bottle blowing machine and a semi-automatic bottle blowing machine:

1. The semi-automatic bottle blowing machine needs to go to the flash manually by itself

2. Fully automatic plastic bottle blowing machine realizes automation and directly produces the finished product, eliminating the labor of flashing in the middle. Saved labor. Under the same energy consumption, energy saving and high efficiency. The product quality is good and the bottle mouth is flat. There will be no overflow after closing the lid, which improves the qualification rate of the product. Orders will not be lost due to substandard products, which will damage the company's reputation.

 

Are you interested in learning more about Automatic Blow Molding Machine? Contact us today to secure an expert consultation!

How to choose a blow molding machine:

If your company's product demand is small and you are just starting this industry, you can choose a semi-automatic blow molding machine. Our company will send professional commissioning workers, from product ingredients to product molding and machine operation and maintenance, training is in place. Buying our equipment gives you no worries.

 

If your company's plastic barrels have a large demand, then go for a fully automatic bottle blowing machine. This equipment has high production efficiency, saves labor, and does not have the problem of poor management of labor. One master can look at multiple devices, reducing work intensity.

 

7 main components of the blow molding machine

 

1. Preform conveying structure of the bottle blowing machine: The unique mandrel conveying structure of the preform ensures that the preform will not be inverted when heated.

2. High-speed mold-clamping structure of the blow molding machine: The arc mold-clamping structure with independent intellectual property rights patent, special mold-clamping booster system, stable and noise-free high-speed operation.

3. Molding structure of hot-filling bottle for bottle blowing machine: When blowing hot-filling bottle, different required water / oil temperature is evenly distributed in different parts of the mold. The special design of the tee is used to make the crystallinity reach the required level. To achieve good results.

4. Lightweight energy-saving bottle blowing system: cold air combined with hot air, heating bottle mouth and transmission mandrel to cool, induction air device in the heating box to overcome air convection, to ensure the balance of preform heating temperature and prevent surface overheating.

5. Energy-saving sealing machine blowing combination valve: The control valve does not need pipeline connection, compact structure, simple commissioning and maintenance, reasonable high and low pressure gas consumption, and energy consumption control.

6. Simple and reliable manipulators: cam-link bar billets and picking manipulators are easy to operate, have good coordination and low manufacturing costs. Closed loop temperature control mode; preform temperature feedback compensation; quickly reach the steady state of preform heating.

7. Clean and safe design: The bottle blowing machine adopts a fully enclosed structure to ensure that the plastic environment is clean, eliminates external pollution of the bottle, and ensures the plastic cleanliness of large medical infusion bottles. Perfect and reliable safety door system to ensure the safety of operators and long-term operation stability of the blow molding machine.

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