IT1104566B - Injection moulding plastic lenses - in a cavity of reducible size having an overflow pocket
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Injection moulding plastic lenses - in a cavity of reducible size having an overflow pocket
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IT1104566B
IT1104566BIT2024777AIT2024777AIT1104566BIT 1104566 BIT1104566 BIT 1104566BIT 2024777 AIT2024777 AIT 2024777AIT 2024777 AIT2024777 AIT 2024777AIT 1104566 BIT1104566 BIT 1104566B
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Application filed by Weber Hermann PaulfiledCriticalWeber Hermann Paul
Priority to IT2024777ApriorityCriticalpatent/IT1104566B/en
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Publication of IT1104566BpublicationCriticalpatent/IT1104566B/en
The appts. includes a pair of cavity defining dies movable towards each other after injection and an overflow pocket adapted to receive the excess material forced from the cavity. During injection a relatively wide cavity can be maintained to enable easy flow of the material, obviating defects such as knit lines. Redn. of the cavity size enables thin lenses, both concave and convex to be formed. A lens can be formed which required no finishing operation, such as grinding.
IT2024777A1977-02-141977-02-14Injection moulding plastic lenses - in a cavity of reducible size having an overflow pocket
IT1104566B
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