Screw extrusion press and method with mixing rings having passages
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B29B-007/42
B29B-007/34
B29C-047/64
B29C-047/60
출원번호
US-0800788
(2007-05-07)
등록번호
US-7490974
(2009-02-17)
우선권정보
DE-10 2006 022 123(2006-05-11)
발명자
/ 주소
Hennes,Jochen
출원인 / 주소
Kiefel Extrusion GmbH
대리인 / 주소
Collard & Roe, P.C.
인용정보
피인용 횟수 :
6인용 특허 :
3
초록▼
A screw extrusion press for processing thermoplastic and not reticulating polymers comprises a conveying screw (1) in a cylinder (2). The screw comprises a conveying zone (7) and a mixing zone with 10 mixing rings (3). These mixing rings comprise a passage hole (5) that extends from the bottom (10)
A screw extrusion press for processing thermoplastic and not reticulating polymers comprises a conveying screw (1) in a cylinder (2). The screw comprises a conveying zone (7) and a mixing zone with 10 mixing rings (3). These mixing rings comprise a passage hole (5) that extends from the bottom (10) of the screw to the vicinity of the cylinder wall (20) where it opens out into a shear gap (9).
대표청구항▼
The invention claimed is: 1. A screw extrusion press for processing thermoplastic and not reticulating polymers, with a conveying screw (1) in a cylinder, said conveying screw (1) having a conveying zone (7) and a mixing zone with a mixing ring (3) that extends from a bottom (10) of the screw to a
The invention claimed is: 1. A screw extrusion press for processing thermoplastic and not reticulating polymers, with a conveying screw (1) in a cylinder, said conveying screw (1) having a conveying zone (7) and a mixing zone with a mixing ring (3) that extends from a bottom (10) of the screw to a wall (20) of the cylinder, said mixing ring (3) comprising passage holes (4, 5), wherein a shear gap (9) is formed between an outer perimeter wall of the mixing ring (3) and the cylinder wall (20) and wherein at least one passage hole (4, 5) extends from the bottom (10) of the screw or from the vicinity thereof and opens out, at least in part, in said shear gap (9), said at least one passage hole (4, 5) being at least partially closed on an outflow side (12) of said mixing ring (3), thereby conveying and accelerating molten mass from the bottom (10) of the screw (1) to the cylinder wall (20) into said shear gap (9). 2. The screw extrusion press as set forth in claim 1, wherein the shear gap (9) varies in height (6) in the flow direction. 3. The screw extrusion press as set forth in claim 1, wherein the shear gap is sealed (21) on an inflow side (11) of the mixing ring (3). 4. The screw extrusion press as set forth in claim 1, wherein the passage hole (4) comprises a groove (5) that is open on an inflow side (11) of the mixing ring (3) and that opens out into the shear gap on an outflow side (12). 5. The screw extrusion press as set forth in claim 1, wherein the passage hole (4) comprises a groove (5) that is open on an inflow side (11) of the mixing ring (3) and that is partially closed on an outflow side (12). 6. The screw extrusion press as set forth in claim 1, wherein a cross section of the passage hole (4) varies with regard to both its size and its shape in the flow direction. 7. The screw extrusion press as set forth in claim 1, wherein a cross section of the passage hole (4) decreases in the flow direction. 8. The screw extrusion press as set forth in claim 1, wherein when a plurality of passage holes (4) are spaced on a circumference of a mixing ring (3), these passage holes vary in cross section and shape about the circumference. 9. The screw extrusion press as set forth in claim 1, wherein the passage hole (4, 5) extends at an acute angle with respect to an axis of the screw when viewed in the flow direction. 10. The screw extrusion press as set forth in claim 1, wherein the passage hole (4, 5) extends at right angles with respect to an axis of the screw when viewed in the direction of the flow. 11. The screw extrusion press as set forth in claim 1, wherein a passage hole is configured to be a bore (5). 12. The screw extrusion press as set forth in claim 11, wherein the bore (5) opens out into the shear gap (9). 13. The screw extrusion press as set forth in claim 12, wherein the bore (5) ends in parts in the shear gap (9) and in parts on the outflow side (12) of the mixing ring (3). 14. The screw extrusion press as set forth in claim 1, wherein wall margins on the inflow side (11) and on the outflow side (12) of a mixing ring (3) are inclined at an angle different from the right angle with respect to an axis of symmetry of the screw extrusion press (1). 15. The screw extrusion press as set forth in claim 1, wherein a plurality of mixing rings (3) are arranged on a screw extrusion press (1), the mixing rings (3) having different configurations. 16. A method of conveying and mixing a thermoplastic and not reticulating polymer, using a screw extrusion press with a conveying screw (1) in a cylinder, the conveying screw (1) having a conveying zone and a mixing zone with a mixing ring (3) being utilized for conveying and mixing, said mixing ring (3) extending from a bottom (10) of the screw to a cylinder wall (20) of the screw extrusion press and the polymers being mixed by conveying them through passage holes (4, 5) on the mixing ring (3), wherein the polymers are conveyed through at least one passage hole toward a shear gap and flow axially past at least part of the mixing ring (3) along the shear gap (9), said shear gap being formed between an outer perimeter wall of the mixing ring (3) and the cylinder wall (20), said at least one passage hole (4, 5) being at least partially closed on an outflow side (12) of said mixing ring (3), thereby conveying and accelerating molten mass from the bottom (10) of the screw (1) to the cylinder wall (20) into said shear gap (9).
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