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AssigneesGyros AB, Amic AB
InventorsPer Ove Ohman, Lars Rune Lundbladh
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A method of producing a plastic product having a microstructured surface (3a), utilizing an arrangement for moulding plastic products. Said arrangement has at least two mould parts (2, 3) movable towards and away from each other, a predetermined volume of a viscous polymerizable plastic material (9) being supplied to a cavity formed between the mould parts, after which polymerization of the plastic material occurs. After said polymerization of the plastic material (9′), the mould parts are caused to move apart from each other thereby allowing removal of a finished plastic product the outer shape of which conforms to the shape of the cavity produced by the mould parts. Said viscous polymerizable plastic material (9) is supplied to the cavity (6) around a hole (10a) pertaining to the finished plastic product, and said viscous plastic material is distributed in a direction from said hole (10a) towards the peripheral edge area of the plastic product.
A method of producing a plastic product having a microstructured outer surface, utilising an arrangement for moulding plastic products, said arrangement having at least two mould parts movable towards and away from each other, a predetermined volume of a viscous polymerisable plastic material being supplied to a cavity formed between the mould parts, after which polymerisation of the plastic material occurs and, after said polymerisation of the plastic material, the mould parts being caused to move apart from each other to allow removal of a finished plastic product the outer shape of which conforms to the inner shape of the cavity produced by the mould parts, characterized in that said viscous polymerisable plastic material is supplied to the cavity around a hole pertaining to the finished plastic product, and in that said viscous plastic material shall be distributed in a direction from said hole towards the peripheral edge area of the plastic product.
An arrangement for moulding plastic products in which the plastic product produced has at least one surface with a microstructure, said arrangement having at least two mould parts movable towards and away from each other by a first means, a predetermined volume of a viscous polymerisable plastic material being supplied to a cavity formed between the mould parts, after which polymerisation of the plastic material occurs and, after said polymerisation of the plastic material, the mould parts being caused by said means to move apart from each other thereby allowing removal of a finished plastic product, the outer shape of which conforms to the inner shape of the cavity produced by the mould parts, characterized in that said viscous polymerisable plastic material, via a second means, can be supplied to the cavity around a hole allocated to the finished plastic product and in that said viscous plastic material is caused to be distributed in a direction from said hole towards the peripheral edge area of the plastic product.
An arrangement as claimed in 15 where the plastic product is produced by means of compression moulding wherein, in almost fully united position of the mould parts by means of said first means and a first cavity formed between the mould parts, a predetermined volume of a viscous polymerisable plastic material is introduced to said first cavity, after which said mould parts are pressed together by said first means to a fully united position in order to distribute said plastic material within a small, second cavity, the inner shape of which corresponds to the outer shape of the final plastic product, whereafter polymerisation of the plastic material occurs with the mould parts in fully united position, characterized in that said viscous polymerisable plastic material is arranged to be supplied to the first cavity within the central area of the finished plastic product and in proximity to a hole allocated to the plastic product.
Dependencies are inferred from the claim text.