A lot of different practices are involved when it comes to manufacturing goods. Blow molding is one of the many and is designed to make hollow parts from plastic. In general, the three types: injection, extrusion, injection stretch.
The procedure starts with plastic being melted. This is then formed into a parison or preform. The latter refers to that which applies to injection stretch and injection practices. The parison is a plastic, tube-shaped piece that has a hole at the end in which compressed air is designed to pass through. This clamps to the mold and air is then blown inside. Pressure from the air is enough to push the plastic out to fit the mold. After being cooled and hardening, the mold opens and is then 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.
There was limitations in number and variety of products that led to a slower popularity. As soon as the production and variety rates improved, the amount of goods increase as a reaction. In America's soft-drink industry, plastic bottles being produced in 1977 were at zero. This number greatly increased to approximately ten billion by the year 1999. In the modern world, so many products are being made in this way and this number is expected to grow even more.
There are different typologies when it comes to this practice. EBM, or the extrusion process, involves plastic being melted and then extruded into a hollow tube. These processes might be continuous or intermittent. Types of products made from this practice: milk bottles, automotive ducting, shampoo bottles, watering cans, polyethylene hollow products and more.
IBM, or the injection process, is used for producing hollow glass and plastic goods in large quantities. With this, the polymer is injection molded on core pins, which are then rotated onto a station for inflation and cooling. This is the process that is used the least in different types. There are two main techniques associated with injection stretch practice: two stage and single.
There are disadvantages and advantages associated with the three different types of molding. Likewise, these are employed for the manufacturing of different parts. The practice, as a whole, has become more common and is employed in numerous industries of today.
The procedure starts with plastic being melted. This is then formed into a parison or preform. The latter refers to that which applies to injection stretch and injection practices. The parison is a plastic, tube-shaped piece that has a hole at the end in which compressed air is designed to pass through. This clamps to the mold and air is then blown inside. Pressure from the air is enough to push the plastic out to fit the mold. After being cooled and hardening, the mold opens and is then 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.
There was limitations in number and variety of products that led to a slower popularity. As soon as the production and variety rates improved, the amount of goods increase as a reaction. In America's soft-drink industry, plastic bottles being produced in 1977 were at zero. This number greatly increased to approximately ten billion by the year 1999. In the modern world, so many products are being made in this way and this number is expected to grow even more.
There are different typologies when it comes to this practice. EBM, or the extrusion process, involves plastic being melted and then extruded into a hollow tube. These processes might be continuous or intermittent. Types of products made from this practice: milk bottles, automotive ducting, shampoo bottles, watering cans, polyethylene hollow products and more.
IBM, or the injection process, is used for producing hollow glass and plastic goods in large quantities. With this, the polymer is injection molded on core pins, which are then rotated onto a station for inflation and cooling. This is the process that is used the least in different types. There are two main techniques associated with injection stretch practice: two stage and single.
There are disadvantages and advantages associated with the three different types of molding. Likewise, these are employed for the manufacturing of different parts. The practice, as a whole, has become more common and is employed in numerous industries of today.
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 injection molding services then he recommends you visit his friends at PTM: Custom Plastics Injection Molding Company.
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