There are numerous procedures that go into manufacturing various goods. Blow molding is among those and is meant to produce hollow parts using plastic materials. Generally, there are three kinds done in this process: injection stretch, injection, extrusion.
The process starts with the melting of plastic. Then it is formed in a parison or preform, which is used for injection stretch and injection procedures. The parison is a piece of plastic shaped like a tube that has a hole at one end in which the compressed air is able to pass through. This is then clamped to a mold and air is blown inside of it. The pressure from the air is enough to push the plastic out to match with the mold. Once it has cooled and hardened, the mold will open and the part can be ejected.
Two men are considered the first to have employed this practice: Enoch Ferngren and William Kopitke. These two also built a device for this practice and sold it to Hartford Empire Company in the year 1938. The concept of the process itself is based on that of glassblowing. The selling of the machine led to the commercial use of this practice.
Limitations of variety and number in the products meant that this process did not become popularized until later. Once variety and production rates grew, the number of the goods increased as well. In the United States soft-drink industry, the plastic bottles that were made in 1977 was zero. The number increased to ten billion by 1999. In the modern day, even more products are being blown, a number that is expected to increase as time goes.
More than one typology is associated with the practice. EBM, or the extrusion process, relates to the plastic that is melted and then extruded in tubes that hollow it. The process might be considered continuous or intermittent. The types of goods produced through this method: automotive ducting, shampoo bottles, polyethylene hollow products, milk bottles, watering cans and more.
Injection, or IBM, is employed for production of hollow glass, as well as plastic objects in big quantities. With this process, polymer is injection molded on a core pin, which is rotated to another station to be inflated and later cooled. This is the least used process of the three different kinds. There are two different methods commonly used for the injection stretch process: single and two stage.
All three kinds of this molding have disadvantages and advantages. Additionally, these are each used for the manufacture of varying products. This practice, overall, is very common today and seen in many industries.
The process starts with the melting of plastic. Then it is formed in a parison or preform, which is used for injection stretch and injection procedures. The parison is a piece of plastic shaped like a tube that has a hole at one end in which the compressed air is able to pass through. This is then clamped to a mold and air is blown inside of it. The pressure from the air is enough to push the plastic out to match with the mold. Once it has cooled and hardened, the mold will open and the part can be ejected.
Two men are considered the first to have employed this practice: Enoch Ferngren and William Kopitke. These two also built a device for this practice and sold it to Hartford Empire Company in the year 1938. The concept of the process itself is based on that of glassblowing. The selling of the machine led to the commercial use of this practice.
Limitations of variety and number in the products meant that this process did not become popularized until later. Once variety and production rates grew, the number of the goods increased as well. In the United States soft-drink industry, the plastic bottles that were made in 1977 was zero. The number increased to ten billion by 1999. In the modern day, even more products are being blown, a number that is expected to increase as time goes.
More than one typology is associated with the practice. EBM, or the extrusion process, relates to the plastic that is melted and then extruded in tubes that hollow it. The process might be considered continuous or intermittent. The types of goods produced through this method: automotive ducting, shampoo bottles, polyethylene hollow products, milk bottles, watering cans and more.
Injection, or IBM, is employed for production of hollow glass, as well as plastic objects in big quantities. With this process, polymer is injection molded on a core pin, which is rotated to another station to be inflated and later cooled. This is the least used process of the three different kinds. There are two different methods commonly used for the injection stretch process: single and two stage.
All three kinds of this molding have disadvantages and advantages. Additionally, these are each used for the manufacture of varying products. This practice, overall, is very common today and seen in many industries.
About the Author:
Henry A. Parker has taught plastics molding techniques for over 15 years. He specializes in injection molding and thermoforming. If you are interested in learning more about custom plastic pallets then he recommends you visit his friends at PTM: Custom Plastics Injection Molding Company.
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