Co-extrusion cross-head die apparatus
OwnerJames A. Millimaninventor
Life of this patent
Estimating the term…
Abstract
Co-extrusion cross-head die apparatus for applying two coating materials in inner and outer layers to an electrical wire, or the like. A body member has a through, axial bore in which a tip and die members, with respective tip and die holders, are positioned. A pair of radial bores, with which sources of two flowable coating materials communicate, extend from the exterior of the body member to the axial bore. The first coating material flows forwardly of the apparatus through a first flow passage, the second coating material flows rearwardly through a second flow passage, and the two materials flow forwardly, in superposed relation, through a third flow passage from a confluence of the first and second passages to an orifice in the die member where they are deposited in uniform, inner and outer layers, on the wire.
Claims34
Cross-head die apparatus having a longitudinal axis for applying two layers of coating material to a filamentary member as the latter is moved longitudinally through said apparatus along a path parallel to said axis, said apparatus comprising:
- a) a body member having a through, axial bore extending between front and rear ends, a first radial bore through which a source of a first, flowable coating material communicates with said axial bore at a first location therein, and a second radial bore through which a source of a second, flowable coating material communicates with said axial bore at a second location therein, between said front end and said first location;
- b) guide means defining an enclosed, elongated conduit within said axial bore, parallel to said axis, establishing a path of movement of said filamentary member through said body member from rear to front;
- c) a die member positioned within said axial bore and having a circular orifice of larger diameter than said filamentary member adjacent said front end and coaxial with said conduit;
- d) means defining first, second and third flow passageways within said axial bore, said first and second radial bores communicating with said first and second flow passageways, respectively, and said third passageway being substantially conical, having first and second ends and communicating at said first end with both said first and second passageways and at said second end with said orifice;
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- e) at least a portion of said second passageway comprising an annular space within said axial bore having a forwardly disposed end communicating with said second radial bore and a rearwardly disposed end communicating with said third passageway, whereby said second coating material flows generally rearwardly through said annular space and thence forwardly into said third passageway in superposed relation with said first coating material for simultaneous deposit of both said first and second coating materials upon said filamentary member as the latter exits said orifice.
Cross-head die apparatus for applying first and second, flowable coating materials in separate, inner and outer layers to a filamentary member as the latter is moved longitudinally through said apparatus, said apparatus comprising:
- a) a body member having a through, axial bore extending between front and rear ends, a first radial bore communicating with said axial bore at a first position therein, and a second radial bore communicating with said axial bore at a second position therein between said first position and said front end;
- b) first means defining a first flow passage within said axial bore for flow of said first coating material from said first position generally toward said front end to a third position within said axial bore;
- c) second means defining a second flow passage within said axial bore for flow of said second coating material from said second position generally toward said rear end to said third position, where said first and second flow passages merge;
- d) third means defining a third flow passage through which said first and second coating materials flow in superposed relation from said third position generally toward said front end to a fourth position where said superposed layers are simultaneously applied to said filamentary member;
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- e) means defining a die orifice for passage of said filamentary member with said first and second coating materials in covering relation thereto in respective, inner and outer layers.
Cross-head die apparatus having a longitudinal axis and adapted to apply to a filamentary member a coating of two layers of material separately injected radially into said apparatus while in a flowable state as said filamentary member is moved longitudinally through said apparatus, said apparatus comprising:
- a) a body member having a through bore extending axially between front and rear ends, and first and second radial bores through which first and second flowable coating materials respectively communicate with said axial bore;
- b) a hollow core tube having an external surface with forward and rearward portions respectively configured to provide a first flow path for generally forward flow of said first material to a front end of said first flow path, and for mating engagement with a rear part of said through bore;
- c) a tip member having a through, axial passageway defining a longitudinal path of travel for said filamentary member and an external surface with a rear portion configured for mating engagement with the internal surface of said hollow core tube and a forward portion extending forwardly of said core tube within said through bore;
- d) a die member having a frustoconical external surface, a forward end with an orifice for passage of said filamentary member with said first and second materials coated thereon in superposed, first and second layers, and an internal cavity extending from communicating relation with said orifice to the rear end of said die member;
- e) a die holder having a through bore with a first surface portion in mating engagement with said die member external surface and means defining at least a portion of a second flow path for said second material, at least a portion of said second flow path being generally toward said body member rear end where said second path terminates at a rearmost end;
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- f) means defining a third flow path extending from a rearward end where said front end of said first flow path merges with said rearmost end of said second flow path, to a forward end where said superposed layers are simultaneously applied to said filamentary member.
Cross-head die apparatus for simultaneously applying layers of first and second coating materials in superposed, inner and outer layers to a filamentary member as the latter is moved longitudinally through said apparatus from a rear to a front end thereof, said apparatus comprising:
- a) a body member having a through bore with a longitudinal axis extending between said rear and front ends, said filamentary member moving parallel to said axis;
- b) means defining a first flow passage within said body member completely surrounding said axis for flow of said first coating material in a direction toward said front end of said body member to a frontmost end of said first flow passage;
- c) means defining a second flow passage within said body member completely surrounding said axis for flow of said second coating material in a direction toward said rear end of said body member to a rearmost end of said second passage;
- d) means defining a third flow passage within said body member completely surrounding said axis, said third flow passage having a rearmost end where said frontmost end of said first flow passage merges with said rearmost end of said second flow passage for flow of both said first and second coating materials in superposed relation in a direction toward said front end of said body member to a frontmost end of said third flow passage;
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- e) means for simultaneously applying said first and second coating materials as inner and outer layers, respectively, to said filamentary member as said materials exit said frontmost end of said third flow passage.
Dependencies are inferred from the claim text.