CA2526196A1 - Regular division of melt flow in extrusion of blown films - Google Patents
Regular division of melt flow in extrusion of blown films Download PDFInfo
- Publication number
- CA2526196A1 CA2526196A1 CA002526196A CA2526196A CA2526196A1 CA 2526196 A1 CA2526196 A1 CA 2526196A1 CA 002526196 A CA002526196 A CA 002526196A CA 2526196 A CA2526196 A CA 2526196A CA 2526196 A1 CA2526196 A1 CA 2526196A1
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- flow
- die
- annular
- ring
- generally
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Abstract
An extrusion die having a plurality of die layers stacked one upon the other in a direction generally parallel to the central axis. Each of the layers has an annular flow distribution ring (40) having an outer generally cylindrical surface and an annular feed ring surrounding and engaging the outer surface of the distribution ring (42, 42d). At the engaged surfaces of the feed and distribution ring, the flow from the feed ring is divided into a number of substantially equal flow portions. Seas (43a, 43b) between adjacent engaged surfaces confine the flow between the circumferential surfaces of the feed and distribution ring. Half of the flow portions are directed to a recombination region (45, 46) on one side of the distribution ring (42d), and half are directed t o a recombination region (45, 46) on the other side of the ring (42d). In recombining, weld lines are formed in high flow areas minimizing t he deleterious effect of polymer degradation. Subsequently, the flows on the opposite sides of the distribution ring (42d) are recombined su ch that the weld lines from one half are first modified to exhibit lower flow and then are layered with non-weld line portions modified to exhibit higher flow from the other half. This further minimizes the negative effect of weld line areas. Flow from the two sides is regularly divided to yield even distribution of the combined flows.
Claims (43)
1. An extrusion die in which material is extruded at an annular orifice in a direction generally parallel to a central axis of the die, the die comprising:
a plurality of die layers stacked one upon the other in a direction along the central axis, each of the die layers including:
channels for dividing an input of material into first and second flows of the material which are provided along first and second axially spaced and axially facing surfaces away from each other, the first and second flows being brought together to be provided to the orifice, the first flow having 2n passages with 2n outputs along the first axial surface at equally spaced circumferential locations; and the second flow having 2n passages with 2n outputs along the second axial surface at equally spaced circumferential locations and offset from the passages and outputs from the first flow.
a plurality of die layers stacked one upon the other in a direction along the central axis, each of the die layers including:
channels for dividing an input of material into first and second flows of the material which are provided along first and second axially spaced and axially facing surfaces away from each other, the first and second flows being brought together to be provided to the orifice, the first flow having 2n passages with 2n outputs along the first axial surface at equally spaced circumferential locations; and the second flow having 2n passages with 2n outputs along the second axial surface at equally spaced circumferential locations and offset from the passages and outputs from the first flow.
2. An extrusion die in which material exits the die at an annular orifice in a direction generally parallel to the central axis of the die, the die comprising:
an input for receiving a flow of material in a single flow;
an annular distribution ring arranged to provide for flow received from the input through a plurality of flow channels;
a first subset of said flow channels terminating in ports at a first generally axially facing annular surface; and a second subset of said flow channels terminating in ports at a second generally axially facing annular surface, said first and second generally axially facing surfaces facing away from each other and in generally opposite directions, each of the first and second generally axially facing surfaces thereby receiving a portion of the flow from the input.
an input for receiving a flow of material in a single flow;
an annular distribution ring arranged to provide for flow received from the input through a plurality of flow channels;
a first subset of said flow channels terminating in ports at a first generally axially facing annular surface; and a second subset of said flow channels terminating in ports at a second generally axially facing annular surface, said first and second generally axially facing surfaces facing away from each other and in generally opposite directions, each of the first and second generally axially facing surfaces thereby receiving a portion of the flow from the input.
3. The die of claim 2, including a feed ring engaging said distribution ring, said feed ring having a radially inner generally cylindrical surface engaging an outer surface of said flow distribution ring and including a flow channel extending outwardly from said inner surface of said feed ring and providing for flow of material through said feed ring from the input at an outer surface of said feed ring, and said inner surface of said feed ring and said outer surface of said flow distribution ring define therebetween a series of circumferentially extending channels arranged to divide flow from said flow channel into said substantially identical flow portions.
4. The die of claim 2, including a third generally axially facing surface facing and closely spaced from said first generally axially facing surface and arranged to provide for flow from said first subset of flow channels generally radially inwardly between said first and third surfaces to an inner annular recombination area, and a fourth generally axially facing surface facing and closely spaced from said second generally axially facing surface and arranged to provide for flow from said second subset generally radially inwardly between said second and fourth surfaces to said recombination area.
5. The die of claim 2, wherein said ports of said first subset are offset circumferentially intermediate said ports of said second subset, the die further comprising:
a third generally axially facing surface facing and closely spaced from said first generally axially facing surface thereby providing for flow from said first subset generally radially inwardly between said first and third surfaces to an annular recombination area; and a fourth generally axially facing surface facing and closely spaced from said second generally axially facing surface thereby providing for flow from said second subset generally radially inwardly between said second and fourth surfaces to said recombination area, said first, second, third and fourth generally axially facing surfaces are such that said flow between said first and third surfaces and said flow between said second and fourth surfaces are symmetrical and are combined in said recombination area.
a third generally axially facing surface facing and closely spaced from said first generally axially facing surface thereby providing for flow from said first subset generally radially inwardly between said first and third surfaces to an annular recombination area; and a fourth generally axially facing surface facing and closely spaced from said second generally axially facing surface thereby providing for flow from said second subset generally radially inwardly between said second and fourth surfaces to said recombination area, said first, second, third and fourth generally axially facing surfaces are such that said flow between said first and third surfaces and said flow between said second and fourth surfaces are symmetrical and are combined in said recombination area.
6. The die of claim 2, including an annular feed ring surrounding and having a radially inner generally cylindrical surface engaging an outer surface of said flow distribution ring, said feed ring including a flow channel extending generally radially outwardly from said inner surface of said feed ring and providing for flow of material through said feed ring from an outer surface of said feed ring.
7. The die of claim 4, wherein said first and third surfaces define therebetween a first annular land region, second and fourth surfaces define therebetween a second annular land region, said first annular land region includes a first flow gap therebetween, and said second annular region includes a second flow gap therebetween.
8. The die of claim 7, wherein said first annular region is coaxial with and radially within a first annular flow channel, and said second annular region is coaxial with and radially within a second annular flow channel.
9. The die of claim 7, wherein said first annular land region includes a surface spaced from one of said first and third surface to provide said first flow gap for flow from the first flow channel, and said second annular land region includes a surface spaced from one of said second and fourth surfaces to provide said second flow gap for flow from the second flow channel.
10. The die of claim 9, wherein the surfaces defining the first and second flow gaps are generally axially facing and the flows in the gaps are in a generally radially inward direction.
11. The die of claim 7, wherein the first gap and the second gap are symmetrical and are circumferentially offset relative to each other.
12. The die of claim 7, wherein the first gap and second gap are arranged such that flow through one of the gaps has a cross-section identical to that of flow through the other of the gaps, and said cross-sections are such that the flows join together inwardly of the gaps to create a uniform combined flow.
13. The die of claim 2, wherein the ports of the first subset are offset circumferentially intermediate the ports of the second subset.
14. The die of claim 2, wherein the flow channels are substantially radially extending.
15. The die of claim 4, wherein a distance from terminating points of the first and subset of flow channels to the recombination area are all substantially equal and equal to a distance from terminating points of the second subset of flow channels to the recombination area.
16. The die of claim 2, wherein the die has a series of die layers, at least one of the die layers including the input, annular distribution ring, first and second subset of flow channels and first and second generally axially facing surfaces.
17. The die of claim 2, wherein the plurality of flow channels are each radially inwardly extending and lie in one axial plane.
18. An extrusion die in which material exits the die at an annular orifice in a direction generally parallel to the central axis of the die, the die comprising:
an input for receiving material in a single flow;
a flow ring having a plurality of flow passages from receiving material from the input and providing for flow therethrough, said flow passages terminating in a first subset of a circumferentially spaced ports at a first annular surface of said flow ring and in a second subset of circumferentially spaced ports at a second annular surface of said flow ring, a third surface facing and closely spaced from said first surface and arranged to provide for flow from said first subset generally between said first and third surfaces; and a fourth surface facing and closely spaced from said second surface and arranged to provide for flow from said second subset generally between said second and fourth surfaces, said first and third surfaces defining therebetween a first annular land region, said second and fourth surfaces defining therebetween a second annular land region, said first annular land region including a first flow gap therebetween, and said second annular region including a second flow gap therebetween.
an input for receiving material in a single flow;
a flow ring having a plurality of flow passages from receiving material from the input and providing for flow therethrough, said flow passages terminating in a first subset of a circumferentially spaced ports at a first annular surface of said flow ring and in a second subset of circumferentially spaced ports at a second annular surface of said flow ring, a third surface facing and closely spaced from said first surface and arranged to provide for flow from said first subset generally between said first and third surfaces; and a fourth surface facing and closely spaced from said second surface and arranged to provide for flow from said second subset generally between said second and fourth surfaces, said first and third surfaces defining therebetween a first annular land region, said second and fourth surfaces defining therebetween a second annular land region, said first annular land region including a first flow gap therebetween, and said second annular region including a second flow gap therebetween.
19. The die of claim 18, wherein said flow ring includes a plurality of flow channels extending radially through at least a portion of the radial thickness of said ring and providing for flow therethrough, a first subset of said radially extending flow channels terminating in respective ones of said first set of circumferentially spaced ports and a second subset of said radially extending flow channels terminating in respective ones of said second set of circumferentially spaced ports.
20. The die of claim 18, wherein said first and third surfaces define therebetween a first generally coaxial annular flow channel and said first annular region is coaxial with and radially within the first annular flow channel, and said second and fourth surfaces define therebetween a second generally coaxial annular flow channel and said second annular land region is coaxial with and radially within the first annular flow channel.
21. The die of claim 18, wherein said first annular land region includes a surface spaced from one of said first and third surfaces to provide said first flow gap for flow from said first flow channel, and said second annular land region includes a surface spaced from one of said second and fourth surfaces to provide said second flow gap for flow from said second flow channel.
22. The die of claim 21, wherein said surfaces defining said first and second flow gaps are generally axially facing and the flows in said gaps are in a generally radially inwardly direction.
23. The die of claim 18, wherein said ports of said first set are offset circumferentially intermediate said ports of said second set.
24. The die of claim 18, wherein said first gap and said second gap are symmetrical and circumferentially offset relative to each other.
25. The die of claim 18, wherein said first gap and said second gap are arranged such that the flow through one of said gaps has a cross section identical to that of the flow through the other of said gaps, and said cross-sections are such that said flows join together inwardly of said gap to create a uniform combined flow.
26. The die of claim 18, wherein the first and second annular surfaces are axially facing and face away from each other in generally opposite axial directions.
27. An extrusion die in which material is extruded at an annular orifice in a direction generally parallel to a central axis of the die, the die having a plurality of die layers stacked one upon the other in a direction generally parallel to the central axis, each of the die layers including:
an annular flow distribution ring formed in a unitary piece and having a radially outer surface;
an annular feed ring surrounding and having a radially inner surface engaging the outer surface of the flow distribution ring;
the feed ring and flow distribution ring of each layer including respective axial surfaces generally perpendicular to the central axis, the feed ring and flow distribution ring having a similar length in the axial direction;
a generally radial feed ring flow channel extending from an outer surface of said feed ring to the radially inner surface of the feed ring;
the inner surface of the feed ring and the outer surface of the flow distribution ring defining therebetween a series of channels arranged to divide flow from the radial feed ring flow channel into a plurality of substantially identical flow portions; and the flow distribution ring having a plurality of generally radially extending distribution flow channels each extending through the distribution ring and arranged to receive one of the plurality of substantially identical flow portions.
an annular flow distribution ring formed in a unitary piece and having a radially outer surface;
an annular feed ring surrounding and having a radially inner surface engaging the outer surface of the flow distribution ring;
the feed ring and flow distribution ring of each layer including respective axial surfaces generally perpendicular to the central axis, the feed ring and flow distribution ring having a similar length in the axial direction;
a generally radial feed ring flow channel extending from an outer surface of said feed ring to the radially inner surface of the feed ring;
the inner surface of the feed ring and the outer surface of the flow distribution ring defining therebetween a series of channels arranged to divide flow from the radial feed ring flow channel into a plurality of substantially identical flow portions; and the flow distribution ring having a plurality of generally radially extending distribution flow channels each extending through the distribution ring and arranged to receive one of the plurality of substantially identical flow portions.
28. The die of claim 27, wherein each of the distribution flow channels has a radially inner point at which each flow channel turns in an axial direction, wherein a first group of the distribution flow channels turn in one axial direction and a second group of the distribution flow channels turn in the other axial direction.
29. The die of claim 28, wherein the distribution ring has an outer portion and an inner portion, the inner portion having a lesser axial thickness than the outer portion and having a first axial surface facing one axial direction and a second axial surface facing the other axial direction.
30. The die of claim 29, wherein the first group of distribution flow channels provide flow to the first axial surface and the second group of distribution flow channels provide flow to the second axial surface.
31. The die of claim 30, wherein the feed ring has a single feed ring flow channel for providing a flow from one source.
32. An extrusion die in which material exits the die at an annular orifice in a direction generally parallel to a central axis of the die, the die having a plurality of die layers stacked in an axial direction, each die layer comprising:
an annular feed ring having an input for receiving a flow of material in a single flow;
an annular distribution ring surrounded by the feed ring for providing the flow from the input to a plurality of flow channels including:
a first flow channel having a port for providing the flow along a first axial direction to a generally axially facing first annular surface that faces the first direction; and a second flow channel having a port for providing the flow along a second axial direction opposite to the first axial direction to a generally axially facing second annular surface that faces the second direction.
an annular feed ring having an input for receiving a flow of material in a single flow;
an annular distribution ring surrounded by the feed ring for providing the flow from the input to a plurality of flow channels including:
a first flow channel having a port for providing the flow along a first axial direction to a generally axially facing first annular surface that faces the first direction; and a second flow channel having a port for providing the flow along a second axial direction opposite to the first axial direction to a generally axially facing second annular surface that faces the second direction.
33. The die of claim 32, wherein the distribution ring has a radially outer portion and a radially inner portion with the axial length of the inner portion being less than the axial length of the outer portion.
34. The die of claim 33, wherein the first and second axial surfaces are on the inner portion.
35. The die of claim 34, further comprising a first tapered surface extending inwardly from the first axial surface and a second tapered surface extending inwardly from the second axial surface, the first and second tapered surfaces meeting at a point to combine flow provided to the first and second surfaces from the first and second flow channels.
36. The die of claim 32, further comprising a first tapered surface extending inwardly from the first axial surface and a second tapered surface extending inwardly from the second axial surface, the first and second tapered surfaces meeting at a point to combine flow provided to the first and second surfaces surfaces from the first and second flow channels.
37. The die of claim 32, wherein the flow from the first and second axial surfaces have identical but displaced cross-sections such that the combined flow creates a uniform flow.
38. An extrusion die in which material to be extruded flows radially inwardly in the die in a direction generally perpendicular to a central axis of the die and exits the die at an annular orifice in a direction generally parallel to the central axis, said die including a plurality of die layers stacked one upon the other in a direction generally parallel to the central axis, each of said layers including:
an annular flow distribution ring formed in a unitary piece and having a radially outer generally cylindrical surface; and an annular feed ring surrounding and having a radially inner generally cylindrical surface engaging the outer surface of said flow distribution ring;
the feed ring and flow distribution ring of each layer including respective surfaces generally perpendicular to the axis thereof and positioned axially above and below said cylindrical surfaces thereof, the feed ring and flow distribution ring having a similar length in the axial direction;
said feed ring includes a flow channel extending generally radially outwardly from said inner surface of said feed ring and providing for flow of material through said feed ring from an outer surface of said feed ring; and said inner surface of said feed ring and said outer surface of said flow distribution ring define therebetween a series of circumferentially extending cnannels arranged to divide flow from said flow channel into a plurality of substantially identical flow portions.
an annular flow distribution ring formed in a unitary piece and having a radially outer generally cylindrical surface; and an annular feed ring surrounding and having a radially inner generally cylindrical surface engaging the outer surface of said flow distribution ring;
the feed ring and flow distribution ring of each layer including respective surfaces generally perpendicular to the axis thereof and positioned axially above and below said cylindrical surfaces thereof, the feed ring and flow distribution ring having a similar length in the axial direction;
said feed ring includes a flow channel extending generally radially outwardly from said inner surface of said feed ring and providing for flow of material through said feed ring from an outer surface of said feed ring; and said inner surface of said feed ring and said outer surface of said flow distribution ring define therebetween a series of circumferentially extending cnannels arranged to divide flow from said flow channel into a plurality of substantially identical flow portions.
39. The die of claim 38, further comprising seals between adjacent die layers to prevent flow between surfaces of adjacent die layers, wherein said seals are provided between adjacent engaged surfaces generally perpendicular to the central axis of said die.
40. The die of claim 38, wherein said distribution ring includes a plurality of flow channels each of which extends from a respective one of said circumferentially extending channels radially inwardly through at least a portion of the radial thickness of said distribution ring and provides for flow of a respective one of said flow portions therethrough.
41. The die of claim 39, wherein in each said layer said seals are provided between surfaces of the feed ring thereof perpendicular to the axis of said die and respective surfaces of the distribution ring thereof perpendicular to the axis of said die.
42. The die of claim 38, wherein there are 2n substantially identical flow portions, with each flow portion providing flow to one of 2n radial flow channels in the distribution ring distributed every 360°/(2n) in an axial plane, where n > 1.
43. The die of claim 40, wherein the flow channels extend through the distribution ring, are radially extending, and lie in one axial plane perpendicular to the central axis.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/702,917 US6190152B1 (en) | 1996-08-26 | 1996-08-26 | Regular division of molten extrusion flow |
| US08/702,917 | 1996-08-26 | ||
| CA002235547A CA2235547C (en) | 1996-08-26 | 1997-08-26 | Regular division of melt flow in extrusion of blown films |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002235547A Division CA2235547C (en) | 1996-08-26 | 1997-08-26 | Regular division of melt flow in extrusion of blown films |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2526196A1 true CA2526196A1 (en) | 1998-03-05 |
| CA2526196C CA2526196C (en) | 2009-11-17 |
Family
ID=35851941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002526196A Expired - Fee Related CA2526196C (en) | 1996-08-26 | 1997-08-26 | Regular division of melt flow in extrusion of blown films |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2526196C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114786914A (en) * | 2019-10-11 | 2022-07-22 | 萨克米伊莫拉机械合作社合作公司 | Apparatus and method for producing a multilayer extrudate |
-
1997
- 1997-08-26 CA CA002526196A patent/CA2526196C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114786914A (en) * | 2019-10-11 | 2022-07-22 | 萨克米伊莫拉机械合作社合作公司 | Apparatus and method for producing a multilayer extrudate |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2526196C (en) | 2009-11-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20160826 |