Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1992-10-23
1994-01-18
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
156625, 156654, 156905, 252 792, 252 794, 134 3, B44C 122, C23F 100, C23G 102
Patent
active
052797074
ABSTRACT:
An aqueous solution is provided for removing undesirable "heat discoloration" characteristics from a mold surface, the solution consisting essentially of about 17% to 21% by weight phosphoric acid and about 1% of non-ionic surfactant, the remaining portion being substantially water, with a small amount of colorant and/or fragrance being optionally added as desired. The method of use includes applying the solution to a mold surface of a mold half, the mold surface having undesirable "heat discoloration" characteristics thereon caused while heating the mold half for repair, and removing any residue after about 30 seconds or less thereafter. In particular, the undesirable "heat discoloration" characteristics normally occur after heating the mold half during the process of repairing a damaged mold surface or reworking a mold surface requiring an engineering change. The undesirable "heat discoloration" characteristics require removal to prevent blemishes from being formed on a plastic part during molding of the plastic part, or non-uniform release caused by sticking of the plastic molded part to the mold surface during molding. Optimally, the solution is manually brushed on so that it can be applied as desired to particular mold areas such as those including crevices, depressions and/or mold shutoff areas, and wiped off after several seconds.
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Powell William A.
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