Patent US3829274A successfully refreshed from Google Patents.
US3829274A
Expired / Lapsed
US
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Interchangeable die lips for extrusion die and independently adjustable deckles therefor
Assignee: Beloit Corp
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Filing: 1972-10-19
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Granted: 1974-08-13
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Expires: 1992-10-19
Abstract
Abstract Film extrusion die in the form of an elongated die body, which may be split and divided by a divider plate and have a pair of spaced extrusion orifaces on opposite sides of the divider plate detachably secured to the die body. The divider plate may be removed to provide a single extrusion orifice die, if desired. An inlet for the hot thermoplastic material enters each die half. A manifold chamber in each die half communicates with an associated inlet and leads to a melt flow passageway leading along a wall of the divider. Adjustable die lips define the orifices for the die, and have spaced lands for internal deckles, controlling the edge of the film. A deckle boat supported on the die lips carries spaced deckle seals having sealing engagement with the bottoms of the orifices. An adjustment means is provided for adjusting the external and internal deckles as a unit. The internal deckles may be adjustably moved relative to each other and relative to the external deckle to disrupt the edge of the molten plastic and minimize edge bead. The die lips may be in a package of different forms, best suited to the particular type of plastic being extruded and are all adjustable and interchangeable.
Inventors
- 👤 J Melead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:11
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/31; B29C48/313; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/307; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92609; B29C2948/92628; B29C2948/92704; B29C2948/92819; B29C2948/92857; B29C2948/92904
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
197 words
In a film extrusion die, an elongated die body, at least one inlet leading into said die body, a manifold chamber in communication with said inlet, a melt flow passage leading from said manifold chamber, an orifice forming a continuation of said melt flow passageway, a pair of laterally spaced die lips defining said orifice, each die lip having an internal wall having at least two lands thereon spaced vertically of said orifice, at least two parallel spaced internal deckles guided in each end of said die body for adjustable movement relative to each other along said lands and defining the edge of the film, an external deckle at each end of said die body having sealing engagement with said orifice, means on said die lips supporting said external deckles for slidable movement therealong, adjustment means for moving said external deckles along said die lips to define the width of the film, and means accommodating independent adjustable movement of said internal deckles relative to each other and relative to said external deckles comprising releasable holding means holding said internal deckles for movement together and releasable to enable said internal deckles to be moved relative to each other.
Claim 2
Dependent Claim
197 words
In a film extrusion die, an elongated die body, at least one inlet leading into said die body, a manifold chamber in communication with said inlet, a melt flow passage leading from said manifold chamber, an orifice forming a continuation of said melt flow passageway, a pair of laterally spaced die lips defining said orifice, each die lip having an internal wall having at least two lands thereon spaced vertically of said orifice, at least two parallel spaced internal deckles guided in each end of said die body for adjustable movement relative to each other along said lands and defining the edge of the film, an external deckle at each end of said die body having sealing engagement with said orifice, means on said die lips supporting said external deckles for slidable movement therealong, adjustment means for moving said external deckles along said die lips to define the width of the film, and means accommodating independent adjustable movement of said internal deckles relative to each other and relative to said external deckles comprising releasable holding means holding said internal deckles for movement together and releasable to enable said internal deckles to be moved relative to each other.
Claim 3
Dependent Claim
60 words
The film extrusion die of claim 1, wherein the means selectively operable to move said internal deckles together and to accommodate independent movement of said deckles relative to each other comprises a guide member extending from said external deckle, and forming a guide for said internal deckles guiding said internal deckles for independent adjustable movement relative to said external deckle.
Claim 4
Dependent Claim
40 words
The film extrusion die of claim 2, wherein the folding means comprises an individual collet for each internal deckle carried by said guide member and operable to clampingly engage selective of said internal deckles for movement with said external deckle.
Claim 5
Dependent Claim
26 words
The film extrusion die of claim 2, wherein the means for adjustably moving said external deckles comprises gear means having driving connection to said external deckles.
Claim 6
Dependent Claim
33 words
The film extrusion die of claim 1, wherein at least one of said die lips is adjustably movable relative to said melt flow passageway to vary the width of said passageway and orifice.
Claim 7
Dependent Claim
156 words
In a multi-layer film forming die, an elongated split die body comprising, two die halves, a divider separating said halves, an inlet leading into each half, a manifold chamber in each half in communication with an associated inlet, a melt flow passageway leading from each manifold chamber, said divider defining one wall of each manifold chamber and melt flow passageway, an orifice leading along each side of said divider and forming continuations of said melt flow passageways, a pair of die lips defining the outer walls of said orifices, means mounting said die lips on said halves of said die body for interchangeability with respect to each other, other means adjustably moving said die lips relative to said divider wall, the means mounting said die lips on said die body accommodating ready removal and interchangeability of said die lips in accordance with orifice requirements to attain optimum performance of said orifices for particular film layers formed.
Claim 8
Dependent Claim
156 words
In a multi-layer film forming die, an elongated split die body comprising, two die halves, a divider separating said halves, an inlet leading into each half, a manifold chamber in each half in communication with an associated inlet, a melt flow passageway leading from each manifold chamber, said divider defining one wall of each manifold chamber and melt flow passageway, an orifice leading along each side of said divider and forming continuations of said melt flow passageways, a pair of die lips defining the outer walls of said orifices, means mounting said die lips on said halves of said die body for interchangeability with respect to each other, other means adjustably moving said die lips relative to said divider wall, the means mounting said die lips on said die body accommodating ready removal and interchangeability of said die lips in accordance with orifice requirements to attain optimum performance of said orifices for particular film layers formed.
Claim 9
Dependent Claim
138 words
The multi-layer film forming die of claim 6, wherein one die lip is a flexing die lip and means are provided for flexing said lip and holding said lip in position, wherein the other die lip is a slidably adjUstable die lip having a rigid lip portion, wherein bolt holes are spaced along said die body to accommodate bolting of said die lips to said die body, and wherein registering bolt holes are provided in said die lips and the relationship between said bolt holes in said die lips and said die body is such as to accommodate the interchangeability of said flexible die lip for said slidable die lip on either die half and the substitution of one type of die lip for the other to provide the same types of die lips on each die half.
Claim 10
Dependent Claim
121 words
The multi-layer forming die of claim 7, wherein one die lip is a slidably adjustable die lip having a rigid lip portion, wherein the other die lip is a slidably adjustable die lip having a rigid lip portion and adjustable along an inclined plane inclined downwardly toward said orifice, wherein bolt holes are spaced along said die halves to accommodate bolting of said die lips to said die halves, wherein registering bolt holes are provided in said die lips, and wherein the relationship between said bolt holes on both of said die lips with respect to said bolt holes in said die body is such as to accommodate the interchanging of said die lips on either side of said die body.
Claim 11
Dependent Claim
129 words
The multi-layer film forming die of claim 7, wherein each half of said die body has a bottom wall, a side wall facing perpendicularly thereto and having a shouldered portion joining said bottom wall with said side wall, wherein spaced bolt holes are provided in said bottom wall at equal intervals along said die halves, and wherein said die lips abut said bottom wall and have bolt holes registrable with the bolt holes in said bottom wall regardless of the side of said die body on which said die lips are mounted, and the configuration of said die body is such as to accommodate the use of a wide variety of die lips on either side of said die body without altering said die lips or said die body.
Claim 12
Dependent Claim
109 words
The multi-layer film forming die of claim 8, wherein one of said die lips is a flexing die lip and includes an inner wall having a pair of parallel spaced lands therein cooperating with said divider and also having a slotted portion parallel to the end wall of said die half, and an angularly extending lug defining one end of said slotted portion, an abutment face spaced from and parallel to said lug, and screw means threaded in said lug and abutting said abutment face and operable to react thereagainst and flex said die lip to vary the width of the orifice defined between said die lip and divider.
Claim 13
Dependent Claim
54 words
The multi-layer film forming die of claim 10, wherein said screw means are spaced along said die lip for the length thereof, and wherein a retainer bar for said screw means is provided to retain all of said screw means in position and said die lips in a preselected position relative to said divider.
Claim 14
Dependent Claim
91 words
The multi-layer film forming die of claim 10, wherein at least one of said die lips is slidable towards and from said divider along an inclined plane, wherein a lip support forms a support for said lip and has surfaces conforming to said end wall and shoulder, and has at least one internal land and a downwardly facing inclined wall portion forming a slidable guide for said lip, and wherein screw means are provided for moving said lip along said inclined wall portion and holding said lip in position relative thereto.
Claim 15
Dependent Claim
99 words
The multi-layer film forming die of claim 8, wherein one of said lips is a slide lip slidably movable along said end wall and having an inner wall facing said divider and having a pair of parallel lands spaced therealong, wherein a mounting bar extends along at least one die half in engagement with said shouldered portion of said end wall and extends outwardly and downwardly therefrom, and wherein screw means threaded in said mounting bar and said slide lip are provided to move said slide lip relative to said divider to adjust the orifice to a preselected width.
Claim 16
Dependent Claim
136 words
ThE multi-layer film forming die of claim 6, wherein the die lips each have outwardly opening recessed portions extending therealong terminating at their lower ends in gibs, wherein an external deckle is slidably supported on said gibs and has seals extending therealong having sealing engagement with said orifices, wherein said die lips each have an inner wall, and at least two parallel spaced lands extending along said wall, wherein internal deckles extend within said die lips along said lands and have sealing engagement with said die halves, wherein means are provided for adjustably moving said external deckle along said gibs, and wherein other means are provided to adjustably move said internal deckles with said external deckle and to accommodate independent adjustable movement of said internal deckles relative to each other and relative to said external deckle.
Claim 17
Dependent Claim
55 words
The multi-layer film forming die of claim 14, wherein gear means are provided for adjustably moving said external deckle along said die lips, and releasable clamping means are provided to releasably clamp said internal deckles for adjustable movement with said external deckle, and to accommodate independent movement of said internal deckles relative to each other.
Claim 18
Dependent Claim
158 words
In a die lip and in combination with a die for the extrusion of film and having a bottom wall and an outwardly facing vertical wall, said die lip having a body portion having an upper face engageable with a bottom surface of said die, an inner wall portion defining a wall of a hot flow passageway, and a lip portion forming a continuation of said wall portion and defining the lip of an extrusion orifice, threaded means detachably securing said die lip to said die body and accommodating interchangeability of one die lip for another, and also accommodating adjustment of said body portion and die lip along said bottom wall to vary the width of the hot flow passageway, and alternately arranged push and pull screws for adjustably moving said die lip along said bottom wall in accordance with the width of the flow passageway required for optimum results for a particular thermoplastic material to be extruded.
Claim 19
Dependent Claim
158 words
In a die lip and in combination with a die for the extrusion of film and having a bottom wall and an outwardly facing vertical wall, said die lip having a body portion having an upper face engageable with a bottom surface of said die, an inner wall portion defining a wall of a hot flow passageway, and a lip portion forming a continuation of said wall portion and defining the lip of an extrusion orifice, threaded means detachably securing said die lip to said die body and accommodating interchangeability of one die lip for another, and also accommodating adjustment of said body portion and die lip along said bottom wall to vary the width of the hot flow passageway, and alternately arranged push and pull screws for adjustably moving said die lip along said bottom wall in accordance with the width of the flow passageway required for optimum results for a particular thermoplastic material to be extruded.
Claim 20
Dependent Claim
39 words
The die lip of claim 16, wherein the body portion of said die lip has an outwardly opening horizontally extending slot extending therealong, and wherein differential screw means are operable to flex said die lip portion about said slot.
Claim 21
Dependent Claim
95 words
The die lip of claim 16, wherein a mounting bar extends along said outwardly facing vertical wall and therebeneath and forms a reaction member for said alternately arranged push and pull screws, wherein means are provided for detachably mounting said mounting bar to an associated die lip, and wherein mounting bars are interchangeably mounted on said die, to accommodate the interchangeability of die lips on die, by the interchangeability of said mounting bars for various types of die lips in accordance with orifice requirements for optimum results for the extrusion of a particular thermoplastic material.
Claim 22
Dependent Claim
68 words
The die lip of claim 18, wherein the mounting bar forms a reaction member for said alternately arranged push and pull screws, and has an outwardly inclined abutment portion forming a reaction member for said screw means for flexing said die lip, and a second mounting bar forms a reaction member for moving a slide die lip inwardly and outwardly to determine the width of the extrusion orifice.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |