CA2179438A1 - Extraction device - Google Patents
Extraction deviceInfo
- Publication number
- CA2179438A1 CA2179438A1 CA002179438A CA2179438A CA2179438A1 CA 2179438 A1 CA2179438 A1 CA 2179438A1 CA 002179438 A CA002179438 A CA 002179438A CA 2179438 A CA2179438 A CA 2179438A CA 2179438 A1 CA2179438 A1 CA 2179438A1
- Authority
- CA
- Canada
- Prior art keywords
- deflection roller
- spiral
- shaped grooves
- reversing bar
- tubular plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000605 extraction Methods 0.000 title claims abstract description 11
- 239000011888 foil Substances 0.000 claims abstract description 24
- 239000004033 plastic Substances 0.000 claims abstract description 16
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 230000007246 mechanism Effects 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
- B65H23/022—Registering, tensioning, smoothing or guiding webs transversely by tentering devices
- B65H23/025—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers
- B65H23/0251—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers with a straight axis
- B65H23/0256—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers with a straight axis with opposed helicoidal windings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/355—Conveyors for extruded articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/32—Arrangements for turning or reversing webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/94—Lubricating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/13—Details of longitudinal profile
- B65H2404/131—Details of longitudinal profile shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/13—Details of longitudinal profile
- B65H2404/131—Details of longitudinal profile shape
- B65H2404/1313—Details of longitudinal profile shape concave
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/15—Roller assembly, particular roller arrangement
- B65H2404/154—Rollers conveyor
- B65H2404/1542—Details of pattern of rollers
- B65H2404/15421—Chevron or herringbone configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention pertains to a mechanism for extracting a tubular plastic foil that is manufactured in an extruder by means of blowing. In order to prevent the formation of central folds during the extraction of the tubular plastic foil, the outer surface of at least one deflection roller is provided with spiral-shaped grooves.
Description
EXTRACTION DEVICE
The invention pertains to a device for extracting a tubular plastic foil that is manufactured in an extruder by means of blowing and, in particular, to the deflection roller(s) and/or reversing bar(s) provided in such a device.
EP 0,191,114 B1 discloses a device for the extraction of tubular plastic foils. After flattening the tubular plastic foil that emerges from the blowing head of the extruder, said foil is guided over reversing bars and deflection rollers that are usually arranged such that the foil is reversed.
According to the prior art, reversing bars are frequently provided wherein they can be charged with compressed air which is emitted from bores distributed over the outer surface of said reversing bars. Consequently, it is possible to produce an air cushion between the surface of the reversing bar and the tubular plastic foil as it moves over said bar. The utilization of large air cushions is particularly advantageous in the processing of adhesive and glutinous foils, namely because the foil can practically float over the entire width of the reversing bar.
However, extraction mechanisms that operate with pneumatic reversing bars form a fold in the center of the foil if large air cushions are produced. This central fold inhibits or precludes a flawless windup of the tubular plastic foil.
Consequently, smaller air cushions that counteract the formation of folds in the central part of the reversing bar are used in practical applications. However, this measure tends to result in direct contact between the foil and the reversing bar, particularly, when processing adhesive and glutinous foils.
Cylindrical reversing bars which are known in the art do not prevent the aforementioned formation of central folds.
Consequently, the present invention seeks to obviate and mitigate the disadvantages of the prior art by providing a means for extracting tubular plastic foils manufactured in an extruder by means of blowing, wherein undisturbed processing of the foils is made possible. One particular objective of the present invention consists of preventing the formation of a central fold in the extracted tubular plastic foil.
According to the invention, there is provided, in a device for extracting a tubular plastic foil manufactured in an extruder by means of blowing, at-least-one deflection roller having spiral-shaped grooves on its outer surface.
Accordingly, in one embodiment, the invention provides a device for the extraction of a tubular plastic foil which is manufactured in an extruder by means of blowing, said device comprising at least one deflection roller and one reversing bar, wherein the outer surface of the at-least-one deflection roller is provided with spiral-shaped grooves.
Preferably, the spiral-shaped grooves have an opposite pitch within certain regions of the outer surface of the deflection roller. These regions of opposite pitch can correspond with the two respective halves of the deflection roller. 5uch a deflection roller with spiral-shaped grooves on its surface can be advantageously formed as a spirally grooved rubber roller.
In addition, the diameter of the at-least-one deflection roller can vary along the extent of its longitudinal axis. For example, the surface of the deflection roller can be curved in a concave manner along the extent of the longitudinal axis.
At least one reversing bar can, in contrast, be formed in a spherical manner.
Additional details and advantages of the invention are described in detail below with reference to one embodiment of the invention which is illustrated in the figures.
21794~8 i~
Figure 1 shows a perspective representation of an extraction mechanism in a first operating position;
Figure 2 shows a perspective representation of an extraction mechanism in a second operating position, and Figure 3 shows a sectioned representation of a deflection roller according to one embodiment of the present invention.
Figures 1 and 2 show reversing extraction device 5 in different angular positions. The tubular plastic foil moves through the extraction device in the direction indicated by the arrow. The reference numeral 10 identifies the two deflection rollers.
The respective reversing bars are identified by the reference numeral 14.
Figure 3 shows a deflection roller 10 according to the present invention. This deflection roller differs from conventional deflection rollers due to the fact that spiral-shaped grooves 16, 18 are provided on its outer surface. The reference numeral 20 identifies a center line that divides the longitudinal extent of the deflection roller 10 into two identically long halves. Figure 3 shows spiral-shaped grooves of opposite pitch originating at the central partition line 20.
This pitch is chosen in such a way that the plastic foil extending over the deflection roller is pulled toward the outside, i.e., the formation of central folds is effectively prevented. These grooves are simply realized by recessing the rubber surface of the deflection roller.
In addition, the deflection rollers illustrated in Figures 1 and 2 can have a concave shape that, however, is not illustrated in the figures. This measure also effectively prevents the formation of folds within the central region of the tubular plastic foil.
The invention pertains to a device for extracting a tubular plastic foil that is manufactured in an extruder by means of blowing and, in particular, to the deflection roller(s) and/or reversing bar(s) provided in such a device.
EP 0,191,114 B1 discloses a device for the extraction of tubular plastic foils. After flattening the tubular plastic foil that emerges from the blowing head of the extruder, said foil is guided over reversing bars and deflection rollers that are usually arranged such that the foil is reversed.
According to the prior art, reversing bars are frequently provided wherein they can be charged with compressed air which is emitted from bores distributed over the outer surface of said reversing bars. Consequently, it is possible to produce an air cushion between the surface of the reversing bar and the tubular plastic foil as it moves over said bar. The utilization of large air cushions is particularly advantageous in the processing of adhesive and glutinous foils, namely because the foil can practically float over the entire width of the reversing bar.
However, extraction mechanisms that operate with pneumatic reversing bars form a fold in the center of the foil if large air cushions are produced. This central fold inhibits or precludes a flawless windup of the tubular plastic foil.
Consequently, smaller air cushions that counteract the formation of folds in the central part of the reversing bar are used in practical applications. However, this measure tends to result in direct contact between the foil and the reversing bar, particularly, when processing adhesive and glutinous foils.
Cylindrical reversing bars which are known in the art do not prevent the aforementioned formation of central folds.
Consequently, the present invention seeks to obviate and mitigate the disadvantages of the prior art by providing a means for extracting tubular plastic foils manufactured in an extruder by means of blowing, wherein undisturbed processing of the foils is made possible. One particular objective of the present invention consists of preventing the formation of a central fold in the extracted tubular plastic foil.
According to the invention, there is provided, in a device for extracting a tubular plastic foil manufactured in an extruder by means of blowing, at-least-one deflection roller having spiral-shaped grooves on its outer surface.
Accordingly, in one embodiment, the invention provides a device for the extraction of a tubular plastic foil which is manufactured in an extruder by means of blowing, said device comprising at least one deflection roller and one reversing bar, wherein the outer surface of the at-least-one deflection roller is provided with spiral-shaped grooves.
Preferably, the spiral-shaped grooves have an opposite pitch within certain regions of the outer surface of the deflection roller. These regions of opposite pitch can correspond with the two respective halves of the deflection roller. 5uch a deflection roller with spiral-shaped grooves on its surface can be advantageously formed as a spirally grooved rubber roller.
In addition, the diameter of the at-least-one deflection roller can vary along the extent of its longitudinal axis. For example, the surface of the deflection roller can be curved in a concave manner along the extent of the longitudinal axis.
At least one reversing bar can, in contrast, be formed in a spherical manner.
Additional details and advantages of the invention are described in detail below with reference to one embodiment of the invention which is illustrated in the figures.
21794~8 i~
Figure 1 shows a perspective representation of an extraction mechanism in a first operating position;
Figure 2 shows a perspective representation of an extraction mechanism in a second operating position, and Figure 3 shows a sectioned representation of a deflection roller according to one embodiment of the present invention.
Figures 1 and 2 show reversing extraction device 5 in different angular positions. The tubular plastic foil moves through the extraction device in the direction indicated by the arrow. The reference numeral 10 identifies the two deflection rollers.
The respective reversing bars are identified by the reference numeral 14.
Figure 3 shows a deflection roller 10 according to the present invention. This deflection roller differs from conventional deflection rollers due to the fact that spiral-shaped grooves 16, 18 are provided on its outer surface. The reference numeral 20 identifies a center line that divides the longitudinal extent of the deflection roller 10 into two identically long halves. Figure 3 shows spiral-shaped grooves of opposite pitch originating at the central partition line 20.
This pitch is chosen in such a way that the plastic foil extending over the deflection roller is pulled toward the outside, i.e., the formation of central folds is effectively prevented. These grooves are simply realized by recessing the rubber surface of the deflection roller.
In addition, the deflection rollers illustrated in Figures 1 and 2 can have a concave shape that, however, is not illustrated in the figures. This measure also effectively prevents the formation of folds within the central region of the tubular plastic foil.
Claims (11)
1. A device for the extraction of a tubular plastic foil which is manufactured in an extruder by means of blowing, said device comprising at least one deflection roller and one reversing bar, wherein the outer surface of the at-least-one deflection roller is provided with spiral-shaped grooves.
2. A device as claimed in claim 1 wherein the at-least-one deflection roller has a spirally grooved rubber surface.
3. A device as claimed in claim 1 wherein the spiral-shaped grooves have an opposite pitch within certain regions of the longitudinal extent of the deflection roller.
4. A device as claimed in claim 2 wherein the spiral-shaped grooves have an opposite pitch within certain regions of the longitudinal extent of the deflection roller.
5. A device as claimed in claim 3 wherein two opposing halves of the deflection roller along its longitudinal extent are defined with reference to the center thereof with both said halves being provided with spiral-shaped grooves of opposite pitch.
6. A device as claimed in claim 4 wherein two opposing halves of the deflection roller along its longitudinal extent are defined with reference to the center thereof with both said halves being provided with spiral-shaped grooves of opposite pitch.
7. A device as claimed in claim 1, 2, 3, 4, 5 or 6 wherein the diameter of the at-least-one deflection roller or the reversing bar varies along the extent of the longitudinal axis thereof.
8. A device as claimed in claim 7 wherein a surface of the at-least-one deflection roller or of the reversing bar is concave.
9. A device as claimed in claim 7 wherein the surface of the reversing bar is generally spherical in shape.
10. A device as claimed in claim 7 wherein a surface of said at-least-one deflection roller or of the reversing bar is concave and the surface of at least one reversing bar is generally spherical in shape.
11. In a device for extracting a tubular plastic foil manufactured in an extruder by means of blowing, characterized by at-least-one deflection roller having spiral-shaped grooves on its outer surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19522318.7 | 1995-06-20 | ||
| DE19522318A DE19522318A1 (en) | 1995-06-20 | 1995-06-20 | Trigger device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2179438A1 true CA2179438A1 (en) | 1996-12-21 |
Family
ID=7764761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002179438A Abandoned CA2179438A1 (en) | 1995-06-20 | 1996-06-19 | Extraction device |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0749823A1 (en) |
| JP (1) | JPH091623A (en) |
| BR (1) | BR9602816A (en) |
| CA (1) | CA2179438A1 (en) |
| DE (1) | DE19522318A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9169098B2 (en) | 2005-05-23 | 2015-10-27 | Windmoeller & Hoelscher Kg | Deviation device for a web of film |
| US10011451B2 (en) | 2012-07-16 | 2018-07-03 | Windmoeller & Hoelscher Kg | Reversing device for a film web by means of an expander roller |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10301321B4 (en) * | 2003-01-15 | 2010-02-18 | Windmöller & Hölscher Kg | off device |
| DE102012102483A1 (en) * | 2012-03-22 | 2013-09-26 | Egeplast International Gmbh | Roller or half-shell for support of extruded tube in region of calibration and/or cooling device of extrusion equipment, has recesses that are formed on surface of roller main portion |
| CN105073382A (en) * | 2013-03-27 | 2015-11-18 | 东丽株式会社 | Sweeper roller, plastic film manufacturing device that uses same, and manufacturing method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1197301B (en) * | 1961-03-23 | 1965-07-22 | Artos Maschb Dr Ing Meier Wind | Device for deflecting material webs |
| US3491655A (en) * | 1968-02-23 | 1970-01-27 | Beloit Corp | Blown plastic extrusion development |
| JPS6136352Y2 (en) * | 1979-08-07 | 1986-10-22 | ||
| ATE33363T1 (en) * | 1985-01-18 | 1988-04-15 | Alpine Ag | PULL-OFF DEVICE FOR PLASTIC TUBE FILM. |
| DE3640365A1 (en) * | 1985-12-04 | 1987-07-02 | Barmag Barmer Maschf | Film blowing system with supporting and guide rolls above the frost line |
| DE3903161A1 (en) * | 1989-02-03 | 1990-08-09 | Helmuth Schmoock | BROAD ROLLER |
| EP0658506A1 (en) * | 1993-12-16 | 1995-06-21 | Fabriques De Tabac Reunies S.A. | Air cushion deflection device and an accumulating device for a flexible tape, provided with such a deflection device |
| DE4406380C1 (en) * | 1994-02-26 | 1995-08-10 | Erhardt & Leimer Gmbh | Spreading and guiding length of material |
-
1995
- 1995-06-20 DE DE19522318A patent/DE19522318A1/en not_active Ceased
-
1996
- 1996-05-08 EP EP96107244A patent/EP0749823A1/en not_active Withdrawn
- 1996-06-18 BR BR9602816A patent/BR9602816A/en active Search and Examination
- 1996-06-19 JP JP8157306A patent/JPH091623A/en active Pending
- 1996-06-19 CA CA002179438A patent/CA2179438A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9169098B2 (en) | 2005-05-23 | 2015-10-27 | Windmoeller & Hoelscher Kg | Deviation device for a web of film |
| US10011451B2 (en) | 2012-07-16 | 2018-07-03 | Windmoeller & Hoelscher Kg | Reversing device for a film web by means of an expander roller |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19522318A1 (en) | 1997-01-09 |
| EP0749823A1 (en) | 1996-12-27 |
| BR9602816A (en) | 1998-04-22 |
| JPH091623A (en) | 1997-01-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |