There are many different processes involved with manufacturing. Blow molding is the term used to describe one of those processes in which hollow parts made of plastic are formed. Generally speaking, there are three kinds of this: extrusion, injection and injection stretch.
This practice begins with melting plastic. This is then formed into a preform or parison. The former is used for injection and injection stretch procedures. Parison refers to plastic in a tube shape that includes a hole at the end for compressed air to pass through. This is clamped to the mold and the air is blown inside. Pressure from said air is strong enough to push plastic to fit the mold. After it has cooled and hardened, the mold opens and is ejected.
The first people verified to have used this process are William Kopitke and Enoch Ferngren. The concept of this technique is based on that of glassblowing. Kopitke and Ferngren created a blow-molding machine and in 1938, sold it to Hartford Empire Company. This is what launched the commercial-level of this process.
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.
Advantages and disadvantages come with each of these different processes. Furthermore, they might be utilized for the making of different goods. The practice itself has become more popular and is used in many different industries in operation today.
This practice begins with melting plastic. This is then formed into a preform or parison. The former is used for injection and injection stretch procedures. Parison refers to plastic in a tube shape that includes a hole at the end for compressed air to pass through. This is clamped to the mold and the air is blown inside. Pressure from said air is strong enough to push plastic to fit the mold. After it has cooled and hardened, the mold opens and is ejected.
The first people verified to have used this process are William Kopitke and Enoch Ferngren. The concept of this technique is based on that of glassblowing. Kopitke and Ferngren created a blow-molding machine and in 1938, sold it to Hartford Empire Company. This is what launched the commercial-level of this process.
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.
Advantages and disadvantages come with each of these different processes. Furthermore, they might be utilized for the making of different goods. The practice itself has become more popular and is used in many different industries in operation today.
About the Author:
Genevive B. Mata has taught plastics molding techniques for over 15 years. He specializes in injection molding and thermoforming. If you are interested in learning more about plastic pallets manufacturers then he recommends you visit his friends at PTM: Custom Plastics Injection Molding Company.
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