Patent US3801254A successfully refreshed from Google Patents.
US3801254A
Expired / Lapsed
US
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Apparatus for making tubular parisons of thermoplastic material
Assignee: KAUTEX WERKE GmbH
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Filing: 1972-01-04
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Granted: 1974-04-02
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Expires: 1992-01-04
Abstract
Abstract In an extrusion head for forming tubular thermoplastic parisons, the base material emerging from an extruder is divided into two individual material flows, each of which is caused to spread circumferentially about a core in the course of its advance axially with respect to the core to form two tubular coaxial flows, each having a longitudinally extending seam zone. The two coaxial tubes are united in the extrusion head to form a parison in which any seam zone extends only half way through the wall thickness.
Inventors
- 👤 A Godtner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:55
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/695; B29C48/70; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/30; B29C48/32; B29C48/335; B29C48/337; B29C48/34; B29C48/10; B29C48/475; B29C48/48
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
187 words
In an apparatus for making tubular parisons, said apparatus being of the type that includes at least one extruder and an extrusion head coupled downstream thereof and having a housing provided with at least one inlet channel extending from said extruder at an angle with respect to the longitudinal axis of said extrusion head, a core disposed in said housing and defining, with the inner wall thereof, an annular chamber, an extrusion nozzle adjoining said annular chamber, the improvement in said extrusion head comprising, A. at least two individual channels extending from said inlet channels towards said extrusion nozzle coaxially with respect to one another and said core, said individual channels widening concentrically about the circumference of said core in the direction of said extrusion nozzle for forming at least two concentric partial parisons, each individual channel having 1. an upstream end communicating at least indirectly with an associated inlet channel and 2. a downstream end and B. a sole annular collecting channel disposed downstream of said individual concentric channels and communicating with said downstream end thereof for shaping said concentric partial parisons into a complete parison.
Claim 2
Dependent Claim
187 words
In an apparatus for making tubular parisons, said apparatus being of the type that includes at least one extruder and an extrusion head coupled downstream thereof and having a housing provided with at least one inlet channel extending from said extruder at an angle with respect to the longitudinal axis of said extrusion head, a core disposed in said housing and defining, with the inner wall thereof, an annular chamber, an extrusion nozzle adjoining said annular chamber, the improvement in said extrusion head comprising, A. at least two individual channels extending from said inlet channels towards said extrusion nozzle coaxially with respect to one another and said core, said individual channels widening concentrically about the circumference of said core in the direction of said extrusion nozzle for forming at least two concentric partial parisons, each individual channel having 1. an upstream end communicating at least indirectly with an associated inlet channel and 2. a downstream end and B. a sole annular collecting channel disposed downstream of said individual concentric channels and communicating with said downstream end thereof for shaping said concentric partial parisons into a complete parison.
Claim 3
Dependent Claim
34 words
a downstream end and B. a sole annular collecting channel disposed downstream of said individual concentric channels and communicating with said downstream end thereof for shaping said concentric partial parisons into a complete parison.
Claim 4
Dependent Claim
34 words
a downstream end and B. a sole annular collecting channel disposed downstream of said individual concentric channels and communicating with said downstream end thereof for shaping said concentric partial parisons into a complete parison.
Claim 5
Dependent Claim
14 words
An improvement as defined in claim 1, each said individual channel widening to 360*.
Claim 6
Dependent Claim
19 words
An improvement as defined in claim 2, wherein the locations of widest points in each channel are circumferentially spaced.
Claim 7
Dependent Claim
19 words
An improvement as defined in claim 3, wherein said locations are circumferentially spaced 180* with respect to one another.
Claim 8
Dependent Claim
26 words
An improvement as defined in claim 1, each individual channel being formed of two partial channels widening to 180* in the direction of said injection nozzle.
Claim 9
Dependent Claim
17 words
An improvement as defined in claim 5, wherein said partial channels merge into a common individual channel.
Claim 10
Dependent Claim
19 words
An improvement as defined in claim 5, wherein said partial channels merge directly into said sole annular collecting channel.
Claim 11
Dependent Claim
24 words
An improvement as defined in claim 1, including circumferentially extending connecting channels, each establishing communication between an individual channel and its associated inlet channel.
Claim 12
Dependent Claim
43 words
An improvement as defined in claim 1, including a sleeve disposed coaxially with and spaced from said core, one of said individual channels extending between said core and said sleeve and one of said individual channels extending between said sleeve and said housing.
Claim 13
Dependent Claim
27 words
An improvement as defined in claim 9, including additional sleeves disposed coaxially with and spaced from said first-named sleeve, each additional sleeve bounding an additional individual channel.
Claim 14
Dependent Claim
18 words
An improvement as defined in claim 1, including a plurality of extruders, one associated with each inlet channel.
Claim 15
Independent Claim
150 words
An apparatus for making tubular parisons of material extruded from at least one extruder coupled thereto comprising: a housing provided with an inlet to receive said extruded material; core means disposed in said housing and spaced from an inner wall of said housing to define an annular chamber to receive said extruded material; a collection channel and extruder nozzle means downstream of said collection channel; and at least two channel means opening into said inlet and connected to said collection channel and widening about the periphery of said core and directing said extruded material circumferentially into at least two tubular concentric partial parisons whose scAns are circumferentially offset as the extruded material flows through said channel means and ultimately into said collection channel, said channel means and said collecting channel being formed so as to mold said partial concentric parisons contiguously as the complete parison flows from said extruder nozzle.
Claim 16
Independent Claim
150 words
An apparatus for making tubular parisons of material extruded from at least one extruder coupled thereto comprising: a housing provided with an inlet to receive said extruded material; core means disposed in said housing and spaced from an inner wall of said housing to define an annular chamber to receive said extruded material; a collection channel and extruder nozzle means downstream of said collection channel; and at least two channel means opening into said inlet and connected to said collection channel and widening about the periphery of said core and directing said extruded material circumferentially into at least two tubular concentric partial parisons whose scAns are circumferentially offset as the extruded material flows through said channel means and ultimately into said collection channel, said channel means and said collecting channel being formed so as to mold said partial concentric parisons contiguously as the complete parison flows from said extruder nozzle.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |