Blow Molding Machines: Everything You Need to Know
Plastic bottles are used in everyday life to package medicines, cosmetics, food, beverages, and many other products, and their applications are becoming increasingly widespread. These bottles are produced by blow molding machines. In this article, I’ll explain everything you need to know about blow molding machines. We’ll explore what blow molding machines are, their uses, the plastics they can be used for, and…
Plastic bottles are used in everyday life to package medicines, cosmetics, food, beverages, and many other products, and their applications are becoming increasingly widespread. These bottles are produced by blow molding machines.
What is a blow molding machine?
A blow molding machine is an automated, high-speed piece of equipment that uses high-pressure, compressed air to produce plastic bottles in a variety of shapes and sizes. This machine allows plastic bottle manufacturers to produce finished plastic bottles in a wide variety of sizes and shapes.
However, it’s important to purchase a blow molding machine from a reliable and reputable manufacturer or supplier to ensure you get the most out of the machine.
What is a blow molding machine used for?
Plastic bottles are used to hold liquids and semi-solid products. Therefore, blow molding machines are widely used in industries that produce these products. These industries include:
Beverages, Food, Cosmetics, Pharmaceuticals
Types of Plastics Suitable for Blow Molding Machines
Blow molding machines can be used with many different types of plastic. Each plastic has unique properties that make it suitable for specific products.
Polyethylene terephthalate (PET): Polyethylene terephthalate (PET) is a type of polyester used in the production of plastic bottles.
High-density polyethylene (HDPE): HDPE is the most commonly used material for bottles for a variety of products that require the safest, most durable plastic.
Polycarbonate (PC): PC is a transparent and strong plastic ideal for producing bottles with complex shapes that require extreme strength.
Polypropylene (PP): PP is a commonly used, low-density, and extremely strong plastic suitable for producing bottles for high-temperature resistant products.
What is the production process of a blow molding machine?
The process is divided into four main steps.
Preheating
During the preheating step, the preform body (inner and outer walls) is heated to the appropriate molding temperature. During the preform heating process, the bottle neck is cooled.
Blowing
In this stage, the evenly heated preform is fed into the blow molding mold, blown into a bottle using high-pressure gas, and then cooled.
Demolding
After the blow molding is completed, the machine begins demolding.
Transporting
The formed bottles are then pulled or blown out via a conveyor. Do you need a high-quality blow molding machine?
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Three Things You Need to Know About PET Blow Molding Machines
PET bottles are ubiquitous in our lives, from food and beverages to cosmetics and even the medicines we use. But how are these PET bottles of various shapes and functions produced? The answer lies in rotary PET blow molding machines. This article will provide a detailed introduction to the production principles, applications, and advantages of blow molding machines to help you gain a basic understanding and gain some inspiration.
What is a PET stretch blow molding machine?
A PET blow molding machine is a piece of equipment used to produce bottles of various shapes and sizes. Its operating principle is simple: Based on applied air pressure, the blow molding machine blows air into a heated preform, which is then wrapped around a specific PET bottle mold to form the bottle.
What is the overall production process of a blow molding machine?
The first step is preheating. This heats the PET preform to the appropriate molding temperature and ensures uniform heating of the inner and outer surfaces. Since the bottle mouth is already shaped, heating is not required. Therefore, the mouth of the preform needs to be cooled while it is being heated.
The second step is blowing. The evenly heated preform is fed into the blow molding mold via a chain. Sterile high-pressure air is blown into the preform through the center of the mandrel, stretching it circumferentially and expanding it until it fits snugly against the mold wall. The preform is then cooled.
The third step is demolding. After the blow molding is complete, the machine begins venting and demolding.
The fourth step is conveying. The formed PET bottle is transported via a conveyor to the next bottle-making station, where it is pulled out by the lower cylinder and blown into shape.
Preform Heating Tunnel
Where can a blow molding machine be used?
If you look around at products that use PET bottles, you’ll see that PET bottles can hold not only liquids but also semi-solids. Applications for plastic blow molding machines include:
Pharmaceutical Industry.
Food Industry.
Beverage Industry.
Cosmetics Industry.
Of course, packaging companies that supply PET plastic bottles to the aforementioned industries can also use PET bottle blow molding machines suitable for mass production.
How Does a Blow Molding Machine Work?
Of the many machines used to manufacture products, blow molding machines are among the most fascinating and practical. This type of blow molding machine, known as an extrusion blow molder, simply works by blowing air into a parison, forming a hollow bottle in the process. However, the plastic extrusion blow molding process is much more than that.
Blow Molding Process
The extrusion blow molding process produces plastic bottles of various sizes and shapes. Millions of people use these bottles daily for soda, drinking water, cleaning products, food, and more. During this process, low-pressure air at approximately 25 to 150 psi is forced into the parison. This process works with a variety of materials, including low-density polypropylene (LDPE), high-density polyethylene (HDPE), polyvinyl chloride (PVC), polyethylene terephthalate (PET), and polypropylene (PP).
The parison, produced using conventional downward extrusion, is inserted into the mold cavity until it reaches the desired length. The neck end snaps in place and holds, while the bottom end contracts and closes as the tube closes.
A blow needle is inserted into the neck end of the hot parison, and compressed air inflates it to the shape of the mold cavity. Simultaneously, this process forms the threaded opening.
After the mold has sufficiently cooled, it opens, ejecting the finished bottle along with any excess plastic trimmed from the neck and bottom.
Taizhou Fupusi Machinery China Johntao@Fupusi.com
“High Quality, Customer First” is our business philosophy, aiming to provide our customers with the best service. We are striving to become one of the industry’s leading exporters, catering to a wide range of customer needs for extrusion blow molding machines, bottle injection molding machines, injection stretch blow molding machines, injection blow molding machines, EPP EPS molding machines, PET bottle blow molding machines, PET blow molding machines, plastic injection blow molding machines, extruders, EPE foaming machines, and more.