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Material Properties
Vinyl (PVC) Dip Moulding
The process of Vinyl PVC Dip moulding technology encompasses a wide variety of products. It remains a viable production process, as the tooling costs are low compared to other molding types. The beauty of the process is the endless possibilities it offers for a variety of applications.
Versatile Industries
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Injection Molding is the technique of injecting molten plastic into a cold mold and forming a part. A schematic of the main elements of a molding machine are shown in figure. It consists of a hopper that holds the raw plastic pellets. The hopper feeds the barrel with the plastic. The plastic is melted in the barrel and with the help of the screw (piston) is injected into a mold. The mold being colder than the plastic rapidly cools and solidifies the plastic. The mold is then opened and the part is ejected out of the mold.

Moulten plastic is injected at high pressure into an injection mould tool. The plastic cools inside the tool and takes the inverse form of the cavity machined into the tool.

The process takes several stages:
  1. Closing - The tool is closed (the 2 halves are brought together) and clamped under high force. This force is maintained until the end of step 4
  2. Injection - Plastic is injected into the tool at pressure (up to about 2000 bar thus high clamping force required in step 1)
  3. Hold Pressure - Plastic shrinks as it solidifies. The pressure of moulten plastic is maintained for a period of a few seconds (depends on part) to keep filling the tool as this happens.
  4. Cooling - The tool remains closed whilst the plastic cools and becomes solid enough to be ejected.
  5. Opening - The tool is opened.
  6. Ejection - The part is ejected from the tool. The process continues at step 1.
The total time for these 6 steps is usually between about 8 seconds and 3 minutes depending on the thickness of the part being moulded. (Steps 3 & 4 take much longer with thick parts.) Times of 20 to 40 seconds are typical.

Injection molding offers the following advantages
  • High production rates
  • Design flexibility
  • Repeatability within tolerances
  • Can process a wider range of materials
  • Relatively low labour
  • Little need to finishing after moulding
  • Minimum scrap losses