Crosshead apparatus for jacketing wire core
DCFirst Claim
1. Crosshead apparatus for dispensing a tubular section of polymeric plastic composition comprising in combination;
- a) a generally annular body having an inlet at which to receive a continuous flow of at least partially molten polymer plastic composition of which said section is to be formed, said body having an internal bore extending axially therethrough;
b) a manifold having a bore and disposed coaxially within the internal bore of said body for at least a partial length of said body;
c) die means disposed coaxially within the internal bore of said body downstream of said manifold and defining a relatively narrow aperture having an inlet and an outlet in flow communication with the bore of said manifold;
d) means defining a flow path between said body and said manifold for conducting flow of the plastic composition received at said body inlet to near the inlet of said die means and including a pair of matching primary flow channels, each effecting an intersection with a tri-directional splitter for diverting the flow to oppositely oriented secondary channels and over a ramped diversion dam, a substantially annular distribution path defined between said manifold and said body and at least a partially frusto-conical path downstream from said annular path in flow communication between said annular path and the inlet of said die means for said composition to emerge as a tubular section from the outlet of said die means; and
e) temperature controlled heating means operable to maintain the plastic composition in said flow path means in a molten state until reaching at least the aperture inlet of said die means.
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Accused Products
Abstract
Crosshead apparatus for receiving molten plastic from an extruder to be dispensed as plastic tubing or as a sheathing or jacket about a continuously fed product core such as wire. The crosshead includes a body and manifold within the body having a central passage in which the core to be jacketed is continuously fed. The plastic to be dispensed is constantly heated for temperature stability so as to maintain the flow in a molten state while a predetermined smooth transition flow path forms a substantially annular distribution plane from which the flow concentrically converges about the passing product core at the dispensing site.
18 Citations
11 Claims
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1. Crosshead apparatus for dispensing a tubular section of polymeric plastic composition comprising in combination;
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a) a generally annular body having an inlet at which to receive a continuous flow of at least partially molten polymer plastic composition of which said section is to be formed, said body having an internal bore extending axially therethrough; b) a manifold having a bore and disposed coaxially within the internal bore of said body for at least a partial length of said body; c) die means disposed coaxially within the internal bore of said body downstream of said manifold and defining a relatively narrow aperture having an inlet and an outlet in flow communication with the bore of said manifold; d) means defining a flow path between said body and said manifold for conducting flow of the plastic composition received at said body inlet to near the inlet of said die means and including a pair of matching primary flow channels, each effecting an intersection with a tri-directional splitter for diverting the flow to oppositely oriented secondary channels and over a ramped diversion dam, a substantially annular distribution path defined between said manifold and said body and at least a partially frusto-conical path downstream from said annular path in flow communication between said annular path and the inlet of said die means for said composition to emerge as a tubular section from the outlet of said die means; and e) temperature controlled heating means operable to maintain the plastic composition in said flow path means in a molten state until reaching at least the aperture inlet of said die means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification