| 摘要 |
<p>1477204 Protecting stacked glass sheets from staining PILKINGTON BROS Ltd 22 April 1975 [25 April 1974] 18169/74 Heading B8C An interleaving material for separating glass sheets and protecting them from staining comprises a porous finely divided support material, impregnated with a weakly acidic material, and fine particles of a chemically inert plastics. The material may be applied by a powder applicator. The support material may comprise coconut shell flour or hardwood wood flour. The acidic material may comprise adipic, maleic, sebacic, succinic, benzoic, or salicyclic acid, or ammonium chloride. Aqueous or organic solvents may be used to apply the acidic material to the support material with heat or reduced pressure being optionally used to remove the solvent. The plastics material preferably has a larger particle size than the support material and may comprise polyethylene, polystyrene, polytetrafluoroethylene, or a methacrylate polyester. The interleaving material may be between 30 and 300 mesh in size and applied at a rate of between 0À05 and 1 gram/sq. foot of glass.</p> |
