Blow moulding is a manufacturing process for forming and joining together hollow plastic parts. In general, there are three main types of blow moulding: extrusion blow moulding, injection blow moulding (one stage), and injection stretch blow moulding (two stages). In the extrusion blow moulding process (EBM), plastic is melted and extruded into a hollow tube (a plastic parison). This plastic parison is then captured by closing it into a cooled metal mould. 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 mould is opened and the part is ejected. It is designed to manufacture high volume hollow plastic products.

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

Here are the top examples of blow-moulded product categories:

Food and Dairy

The most common needs of humans are kept in these plastics containers. Water bottles, beverage bottles, sauce, milk, food packaging and what not! These are the common products made by Blow Molding Machines with high-speed capacities of over pcs bottles per hour.

Households

Blow Molding Machines can produce household containers like hair oil, detergent bottles, laundry bottles, liquid soap plastic bottles containers and lotion bottles. Most of them are made from a wide range of materials including PC, PET, PP and HDPE.

Pharmaceutical 

If you&#;ve been to a health clinic, your dentist, or to visit your family doctor you can quickly start counting how many hollow containers are used. A large range of refined and essential designed plastic blow-moulded bottles and jars are available from size from 200ml to 10L.

Lubricants / Petrochemicals

Many lubricants and petrochemical products are stored in blow-moulded containers. Containers such as plastic fuel tanks, petrochemicals tanks, oil bottles, storage tanks, etc. They often use multilayered PET to store contaminated lubricants and petrochemicals.

Automotive

Customized shapes with Polystyrene keep products safe, and blow moulding makes the hard to create shapes with ease. Blow moulding is widely used in the automotive industry and makes the design and mass production of automotive parts simple and cost-effective. Many of the parts storing fluids use blow moulding. Cooling system overflow containers, windshield washer fluid bottles, and even fuel tanks are commonly made with blow moulding.

Cosmetics

Did someone say cosmetic? well, people who do make-up know about it all, whether it be foundation or cream to make you glow, its bottles are manufactures in Extrusion Blow Moulding. Other than that health care and personal care bottles are also manufactured by Blow Molding Machine.

Industrial

Where do you store litres and litres of water or oil in your home and factory respectively? Well, think of larger fluid containers like barrels to transport or store water, oil, or anything other liquid, those are manufactured by Blow Moulding.

Chemicals

Sometimes in science labs, you must have noticed plastic flasks to keep chemicals or measuring cylinders/tubes made out of plastic which is manufactured in Blow Moulding. The commonly manufactured bottle is for pesticides.

Toys / Sporting

If you have a small child, you could quickly count how many hollow lightweight toys they have. Blocks and squeeze toys are common uses for blow moulding. A common blow moulded product in sporting goods is a plastic bat, a plastic ball, or another hollow piece of equipment.

Floats

Products that go in the water need to be buoyant, and blow moulding makes hollow products with ease. Float cubes, buoys, fish netballs and other items are commonly made with blow moulding.

It&#;s easy to say that our life is filled with products made from Extrusion Blow Molding Machines. It would be difficult and inconvenient to live without them.

High quality plastic products require high-quality Blow Molding Machines. Central machinery & plastic products offer various customized designs for Blow Molding Machines for our customers. Customers can begin with an idea or a design of finished goods. We can then streamline and all processing, end up with a complete and quality plastic Blow Molding Machine to save customers&#; cost and time.

Our Customers don&#;t suffer the time-consuming process of managing different vendors and schedules. One Blow Molding Machine can produce many types of products with various designs, cost-effectively. CMP&#;s capabilities provide a one-stop solution for your Blow Molding needs, maximizing your efficiency, and saving you money!

Have you ever wondered how the jar your facial moisturizing product is put into got its shape? Do you know how the bottle you&#;re drinking juice from was made?

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Many times these plastic bottles, jars and other containers you package your goods in were created by a common process called extrusion blow molding.

What is Extrusion Blow Molding?

Extrusion blow molding, or EBM, is a manufacturing process where plastic pellets are first melted in an extruder and then expelled into a hollow tube called a parison. The barrel of the extruder helps hold the raw materials being manufactured, and screws help mix the material inside.

The typical resins used in the extrusion blow molding process include:

• HDPE
• LDPE
• PP
• PVC
• ePET
• PETG &
• &#;Soft Touch&#; Resins

Many bottles and jars, whether they are single layer or multi-layer, are produced through this process. Chances are; if you&#;ve ever seen pasta being made, you&#;ve seen an extruder working! It&#;s the exact same concept.

We&#;ll dig a little deeper into the actual process soon, but for now, let&#;s go over some important definitions that apply to the extrusion blow molding process.

Important Process Definitions

Mold

A mold is an assembly that can include one or more cavities.

Cavity

A cavity is the individual molding surface that will produce a single blow-molded part. Cavitation is driven by the quantity of product needed, as well as the size of the container being molded.

Parison

Parisons are the hollow plastic &#;tubes&#; formed by extruding molten material through a die head.

Blow Pin

The blow pin is a tooling component that&#;s introduced into the mold and molten parison in order to blow the compressed air. The blow pin tip also helps form the neck by either the force of the compressed air or the mere compression force of the blow pin against the material (and the neck finish of the mold), depending upon the type of molding machine process being used.

Flash

A flash is the excess material that extends from the mold.

How Does Extrusion Blow Molding Work?

In order to produce the many single or multi-layer bottles and jars you package your products in or even use every day, the process first starts with the plastic pellets we mentioned earlier.

The Extrusion Blow Molding Process Broken Into 5 Steps

1. The extruder turns each plastic pellet into a molten material with the help of a heated barrel and sheer force. Both temperature (frictional and external heat are used) and pressure melt the plastic.
2. The material is then moved through the extrusion tooling to create a parison.
3. In order to be captured, the parison is closed into a water-cooled mold.
4. Next, compressed air is blown into the parison. This blown air inflates the parison into the exact shape of the mold cavity, thus forming a hollow bottle, container, or part. If you&#;ve ever seen glassblowing, it&#;s very much like that.
5. After the plastic has cooled enough, the mold is opened and the part or product is taken out!

It&#;s all pretty simple, right?

If you have any questions, or would like to use MJS Packaging as your preferred packaging solutions provider, please don&#;t hesitate to contact us!

We&#;re always available during normal business hours and we guarantee the MJS Packaging team will address your packaging needs with unmatched experience and a well-rounded approach.

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