| 摘要 |
PCT No. PCT/US95/09193 Sec. 371 Date Apr. 21, 1997 Sec. 102(e) Date Apr. 21, 1997 PCT Filed Jul. 19, 1995 PCT Pub. No. WO96/03270 PCT Pub. Date Feb. 8, 1996A process for selectively forming an antislip surface on a product thermoformed from a plastic sheet is applied to truck bed liners, for example. The surface of a plastic sheet of HDPE or other thermoplastic material is cleaned and masked, preparing a good molecular bonding surface on the selected surface areas. A sprayable or liquid polymer designed to achieve desired characteristics of hardness and toughness without brittleness, such as a thermosetting elastomeric polymer, is formed into droplets, which are sprayed or otherwise applied onto the exposed surface area. The droplets form a stippled pattern of primarily separate bumps, occupying substantially less than 50% of the exposed area. After partial hardening of the bumps, the plastic sheet is thermoformed to produce the thermoformed product. Thermoforming tightly bonds the droplets to the sheet, hardens the droplets forming macroscopic asperities, increases or enhances the three dimensional surface relief, and explodes some droplets with entrapped air to increase surface roughness.
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