H&S Products

a division of Holman Plastics, Inc
 

48368 Milmont Drive,
Fremont, CA 94538
P • 510 659-1550
F • 510 659-0777 get directions 

Pressure Forming

Pressure forming is a refined extension of vacuum forming and is by far the more advanced method of thermoforming. By using female molds for our pressure formed parts, we can create exterior precision that is virtually indistinguishable from injection molded parts.

Step 1: In pressure forming, as in vacuum forming, the plastic sheet is first heated. A pressure vessel is then lowered over the sheet onto the top of the mold and vacuum chamber. The two platens on the machine lock together for a positive seal.

Step 2: Next, vacuum pressure is applied to the mold below the plastic sheet and air pressure is simultaneously forced on top of the sheet. The air pressure can be as high as 150 pounds per square inch and is constant and steady.

Step 3: After the part is formed, the platens separate and fans cool it while the vacuum acts as a clamp.

For more information on the pressure forming process, download our forming guide.