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what is blow molding?

Blow molding is a manufacturing method used in the plastics and polymers industries to create hollow but strong containers for their clients. Plastic beverage bottles and fuel tanks are commonly created through blow molding. A typical blow moulding machine set-up uses an extruded plastic preform and compressed air to fill the chamber of a divided mold. The two halves of the mold separate and the finished container is released.

Although many products are manufactured using the blow molding process, it might be simpler to examine what happens to one particular product -- a standard two-liter soda bottle.

Plastics are actually chains of polymers held together by a strong but fluid bond. The reason a thin soda bottle is strong enough to withstand the pressure of carbonated liquids is a phenomenon called 'biaxial orientation.' The polymer chains in a plastic bottle form in two directions, creating a very strong webbing effect. The plastic itself can be stretched out without sacrificing strength. Blow molding experts takes advantage of this property to make thin but strong containers.

Blow molding a two-liter soda bottle requires a preformed piece called a parison. This parison is usually extruded from a plastic injection mold placed very close to the blow molding machinery. The warm parison looks like a upside-down plastic test tube, with a preformed collar and threads for the cap at the bottom. The parison is mechanically loaded onto a stand and two sides of a bottle-shaped metal mold come together around it.

Before the parison cools down, a hollow ramrod is injected into its center and pushed to the top of the mold, stretching out the warm plastic preform as it goes. Compressed air is then forced out in controlled low-pressure stages through the hollow ramrod. The plastic form is forced out to the sides of the mold. Because the stretching is performed evenly, the plastic remains uniformly thin and strong. The soda bottle assumes the shape of the mold and is dropped out of the blow molding machine as the two mold halves separate. A new parison is extruded and the entire blow molding process begins again. The actual manufacture of a soda bottle takes only a few seconds.

There are other forms of blow molding, but the general principle is the same. The plastic acts much like a latex rubber balloon -- as long as the pressure from the compressed air is controlled, the material will expand uniformly and form the shape of the mold. This requires a fair amount of skill and experience on the part of the blow molding engineers who design new pieces of equipment.

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blow moulding machine

The process of manufacturing, shaping pliable raw material is called molding. It is done by using models called molds or rigid frames. Those who manufacture molds are called mold makers. Blow molding is a popular manufacturing process by which hollow plastic parts are formed. Plastic bottle manufacturers and water bottles manufacturers need to carefully choose the right blow molding machine and PET perform for their applications.


Selecting the blow moulding machine that is apt for your business can be a difficult task if you are not familiar with the concept of blow molding. Blow molding is a manufacturing process used to produce hollow objects from thermoplastic. Plastic injection molding machines and PET blow molding equipments also available.

There are some pointers to be borne in mind when choosing a PET blow molding machine. It comprises of an extruder that has an extrusion head. It should have at least one closing unit. Two closing units are more than welcome. Look out for certain specifications and key features. For instance, the barrel and the screw should be preferably made of steel and processed by nitrifying. The structure of the extruder should be automatically adjustable. Basically, the machine should be such that it can be personalized and customized as per your blow molding machine requirement.

Check for the mold plate, die head and the hydraulic system. You should be able to achieve the optimum performance-cost ratio. Make sure the blow molding equipment production capacity can be elevated. The height, diameter and volume are other aspects to watch out for.

PET preform and plastic bottles can also be found at competitive prices. They can be used for numerous applications. They can be used for carbonated drinks, alcoholic beverages, liquid detergents, body lotions, pharmaceuticals, cosmetics and personal care. The quality of PET bottle blow molding operations depends largely on PET preforms.

Plastic is a non-metallic compound. It can be molded into different forms. It can be hardened for personal and commercial use. Plastic molding products like plastic tubes, toys, bottles, kitchen utensils, protective caps and jars are commonly used. Plastic molding involves a few processes. . It is important to familiarize yourself of the different processes involved. The right process is the one that suits your budget, resources and expertise. Blow molding and injection molding are an integral part of plastic molding. Injection molding involves forcing melted plastic into a mold cavity. Once it is cool, the mold can be removed. It is commonly used in prototyping or mass production of a product. Blow molding is also similar to plastic injection molding. The only difference is that the hot liquid plastic pours out of a barrel vertically in a molten tube. Blow molding products include bottles, containers and tubes. Compression molding, film insert molding and gas assist molding are the other kinds of techniques.
Thermoforming is yet another plastic molding process.

Blow molding machines are advantageous in many ways. They offer high impact resistance, durability, flexible part design, strong part performance under pressure with a variety of materials to choose from and preferred choice for hollow-shaped parts. You are likely to get confused with the various varieties of machines available in the market. It is suggested to import the plastic injection molding machines and blow molding equipment from Taiwan where is advanced in the plastic and molding market for years.

Make sure you choose the blow molding machine and equipment that is apt for your application. You can rely safely on OEM/ODM manufacturers. Before you make a choice, check for all the features and make sure your requirements are met.

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Blow Moulding Machine

PET Blow Moulding Machines are suitable for small and medium sized bottle makers and drinks manufacturers worldwide to produce their own bottle. The machine starts with the preform, heat it, and then stretch-blow the heated preform in the blow mold into oriented PET container. According to different requirement, PET Blow Moulding Machine has the ability to produce PET bottle from narrow neck finishes to wide mouth finishes in the size from 5 ml to 20,000 ml. The wide applicability for both narrow and wide neck, reliable capability make PET Blow Molding Machine become popular and attractive to medium and small size bottle and drink manufacturer all over the world. PET bottles and containers are widely utilized in food and drink industry. PET has the advantages of virtually unbreakable, easy to handle and transport, low cost and easy to manufacture and recycle.

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