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.

Pressure Formed parts made by H&S Products can feature:

• Undercuts
  Pressure formed part can take sharp, drastic undercuts up to 0.5 inches. A removable insert that demolds with the part is used to achieve this.
• EMI-RFI Shielding
  FCC approved coatings shield and protect components. Coatings can be applied to all inside surfaces as required.
• Textures & Finishes
  A wide range of coats and surface textures can be either molded in or painted depending on customer's corporate color schemes.
• Vents & Louvers
  Vents can be formed vertically or horizontally on any surface. Formed vents are tight, clean and sharply defined.
• Logo Depressions
  Areas for logos or label plates add a custom personalized look. Logos can be either embossed or repoussed. Other methods include hot-stamping, silk screening and painting.
• Cut-Outs
  Formed cut-outs allow for A/C plugs, cables and connectors. Counter-sunk holes are for mounting additional hardware.
• Zero (0°) Draft
  Zero draft or negative draft is easily achieved.
• Mounting Bosses & Flanges
  Projecting collars or rims known as bosses or flanges are used to hold parts together and give them strength. Bosses, available with or without threaded inserts, are accurately located within plus or minus .010 of an inch.
• Mating Surfaces
  Formed mating surfaces such as undercuts and relief lines allow a smooth, clean fit that is strong and durable.
• Trimmed Openings
  Openings allow for easy access to hardware. Components such as keyboards, LED displays and switches can protrude through these openings.

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