Mold and method for injection-molding a part with a projecting portion
First Claim
1. A molding method for molding a part by plastic injection, comprising the following steps:
- a) making available a mold forming an enclosure corresponding to the shape of said part to be formed, said enclosure including a cavity designed to form a first projecting portion of said part;
b) injection of a plastic material into said enclosure of said mold, said mold having a first recess area upstream of where said plastic material is injected into said enclosure for receiving at least some of said plastic material to form a first projection portion in the part;
c) modulation of a volume of said cavity in the direction of an increase in said volume during the step b); and
d) performing said modulation step by driving a mobile element in communication with said cavity away from said enclosure using a driving device in order to cause said increase in said volume in said cavity as said plastic material is injected into said cavity during said injection step;
wherein said cavity is arranged substantially perpendicular of a main direction of flow of said plastic material and downstream of where said plastic is injected into said enclosure; and
said cavity receiving said plastic material and causing a second projection portion to be provided in said part, wherein said first projection portion and said second projection portion are substantially the same size.
1 Assignment
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Accused Products
Abstract
A mold and a method for the molding by injection of plastic material of a generally thin part, notably of a vehicle lighting and/or signalling device. The mold comprises two half-molds designed to be disposed one against the other and forming an enclosure designed to be filled with plastic material by injection. The plastic material is injected via an injection nozzle in the vicinity of one end of the part. The volume formed by the mold includes a cavity the volume of which may be modulated by means of a mobile element. During the injection of plastic material, when the latter has reached at least the level of the cavity, the initially zero volume of the cavity is progressively increased via the control means of the mobile element.
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Citations
18 Claims
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1. A molding method for molding a part by plastic injection, comprising the following steps:
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a) making available a mold forming an enclosure corresponding to the shape of said part to be formed, said enclosure including a cavity designed to form a first projecting portion of said part; b) injection of a plastic material into said enclosure of said mold, said mold having a first recess area upstream of where said plastic material is injected into said enclosure for receiving at least some of said plastic material to form a first projection portion in the part; c) modulation of a volume of said cavity in the direction of an increase in said volume during the step b); and d) performing said modulation step by driving a mobile element in communication with said cavity away from said enclosure using a driving device in order to cause said increase in said volume in said cavity as said plastic material is injected into said cavity during said injection step; wherein said cavity is arranged substantially perpendicular of a main direction of flow of said plastic material and downstream of where said plastic is injected into said enclosure; and said cavity receiving said plastic material and causing a second projection portion to be provided in said part, wherein said first projection portion and said second projection portion are substantially the same size. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification