CA2225515A1 - Cooling of sheet material - Google Patents
Cooling of sheet material Download PDFInfo
- Publication number
- CA2225515A1 CA2225515A1 CA002225515A CA2225515A CA2225515A1 CA 2225515 A1 CA2225515 A1 CA 2225515A1 CA 002225515 A CA002225515 A CA 002225515A CA 2225515 A CA2225515 A CA 2225515A CA 2225515 A1 CA2225515 A1 CA 2225515A1
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- plate
- sheet material
- cooling
- calibration plate
- 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
- 239000000463 material Substances 0.000 title claims abstract description 27
- 238000001816 cooling Methods 0.000 title claims abstract description 17
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 13
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 5
- 241001466460 Alveolata Species 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000009349 indirect transmission Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
Classifications
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
- B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
-
- 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
- B29C48/07—Flat, e.g. panels
-
- 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
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/904—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using dry calibration, i.e. no quenching tank, e.g. with water spray for cooling or lubrication
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
- B29C48/912—Cooling of hollow articles of tubular films
- B29C48/913—Cooling of hollow articles of tubular films externally
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A calibration plate for the cooling of thermoplastic sheet material comprises a plurality of passageways for chilled fluid characterised in that at least part of the or each passageway is open to the operative surface of the plate. As with traditional calibration plates, vacuum passages may also be provided to draw a vacuum and maintain the sheet to be cooled in close contact with the plate during the cooling operation. The calibration plate of the invention therefore allows chilled fluid, in particular chilled water, into direct contact with the sheet surface. This has two beneficial effects: firstly, it lubricates the sheet surface, cutting down the friction; and, secondly, with direct contact between the cooling medium and the sheet surface the cooling effect is much more rapid and marked. The calibration plate of the invention therefore enables much higher throughput speeds to be achieved, speeding up the entire process of the production of the sheet material.
Description
CA 0222~ 1997-12-22 COOLING OF :i~ l- MATERIAL
d This invention relates to the cooling of sheet material and in -~ particular relates to the cooling of plastics sheet material following the formation thereof and to a calibration plate there~or.
In the production of thermoplastic sheet material with a hollow profiled structure, for example a corrugated or I-beam structure, a calibration unit is used to cool the sheet following extrusion. A traditional calibration plate is illustrated in section in figure 2 of the accompanying drawings, from which it can be seen that the plate contains passageways through which chilled water is passed in order to effect cooling. This stage in the process represents something of a bottle-neck as the speed of throughput is restricted for two main reasons. These are, firstly, that there is friction between the surface of the sheet being cooled and the calibration plate or plates; and, secondly, the cooling effect is relatively slow owing to the indirect transmission of heat from the sheet surface to the chilled water through the material of the calibration plate itself.
The present invention seeks to provide a calibration plate for the production of thermoplastic sheet material improved in the above respects.
According to the present invention there is provided a calibration plate for the cooling of thermoplastic sheet material which comprises a plurality of passageways for chilled fluid characterised in that at least part of the or each 1 passageway is open to the operative surface of the plate.
As with traditional calibration plates, vacuum passages may also be provided to draw a vacuum and maintain the sheet to be cooled in close contact with the plate during the cooling operation. The calibration plate of the invention therefore CA 0222~ 1997-12-22 allows chilled fluid, in particular chilled water, into direct contact with the sheet surface. This has two beneficial effects: firstly, it lubricates the sheet surface, cutting down the friction; and, secondly, with direct contact between the cooling medium and the sheet surface the cooling effect is much more rapid and marked. The calibration plate of the invention therefore enables much higher throughput speeds to be achieved, speeding up the entire process of the production of the sheet material.
The invention is applicable to the production of various kinds of thermoplastic sheet material, but is particularly useful in the production of alveolate sheet material such as corrugated thermoplastic sheet or I-beam structure thermoplastic sheet, particularly useful in the subsequent preparation of boxes and cartons among other uses. The sheet materials may be of any suitable thermoplastic material but polyolefin materials are preferred.
The invention will be described further, by way of example, with reference to the accompanying drawings, in which:
Figure l is a diagrammatic perspective view of a calibration unit for sheet material;
Figure 2 is a section on line A-A of figure l illustrating a traditional calibration plate; and Figure 3 is a section on line A-A of figure l of a calibration plate according to the invention.
Referring to the drawings, it can be seen from figure l that an extruded thermoplastic corrugated sheet lO is moved between an J
upper calibration plate 12 and a lower calibration plate 14 in order to cool it. The sheet is moved by a series of motorised rubber coated rollers (not shown).
CA 0222~ 1997-12-22 Conventionally, the calibration plates 12,14 have the internal structure similar to that shown in figure 2. That is, there are vacuum passages 16 for holding the sheet material 10 in close contact with the calibration plate and passageways 18 through which chilled fluid, such as water, is passed to effect cooling.
In accordance with the invention, however, as illustrated in figure 3, a calibration plate 12 comprises vacuum passages 16 as before but in this case the passageways 18 carrying the chilled fluid such as water are not totally enclosed within the body of the plate 12 but are open at the surface 20 of the plate.
In use, the surface of the sheet 10 in effect provides the missing wall of each passageway 18 but the water flow, being in direct contact with the sheet 10, ensures a rapid cooling effect. Moreover, sufficient water spreads across the whole surface of the sheet 10 to provide a lubricating effect.
Excess water is sucked up through the vacuum passageways 16.
More than one calibrator 12,14 can used as required by the sheet thickness and the intrinsic heat capacity of the material of the sheet. The calibrators can be fixed or movable according to the thickness of the sheet material and the production speed to improve heat dispersion on the surface, especially if the the material is not a good heat conductor and therefore needs extra time to disperse heat from the core of the sheet to the surface.
1 The system of the invention provides a very much more effective and rapid means of cooling a thermoplastic sheet and removes the "bottle neck" effect of previous calibration plates, enabling much more rapid production to be achieved.
d This invention relates to the cooling of sheet material and in -~ particular relates to the cooling of plastics sheet material following the formation thereof and to a calibration plate there~or.
In the production of thermoplastic sheet material with a hollow profiled structure, for example a corrugated or I-beam structure, a calibration unit is used to cool the sheet following extrusion. A traditional calibration plate is illustrated in section in figure 2 of the accompanying drawings, from which it can be seen that the plate contains passageways through which chilled water is passed in order to effect cooling. This stage in the process represents something of a bottle-neck as the speed of throughput is restricted for two main reasons. These are, firstly, that there is friction between the surface of the sheet being cooled and the calibration plate or plates; and, secondly, the cooling effect is relatively slow owing to the indirect transmission of heat from the sheet surface to the chilled water through the material of the calibration plate itself.
The present invention seeks to provide a calibration plate for the production of thermoplastic sheet material improved in the above respects.
According to the present invention there is provided a calibration plate for the cooling of thermoplastic sheet material which comprises a plurality of passageways for chilled fluid characterised in that at least part of the or each 1 passageway is open to the operative surface of the plate.
As with traditional calibration plates, vacuum passages may also be provided to draw a vacuum and maintain the sheet to be cooled in close contact with the plate during the cooling operation. The calibration plate of the invention therefore CA 0222~ 1997-12-22 allows chilled fluid, in particular chilled water, into direct contact with the sheet surface. This has two beneficial effects: firstly, it lubricates the sheet surface, cutting down the friction; and, secondly, with direct contact between the cooling medium and the sheet surface the cooling effect is much more rapid and marked. The calibration plate of the invention therefore enables much higher throughput speeds to be achieved, speeding up the entire process of the production of the sheet material.
The invention is applicable to the production of various kinds of thermoplastic sheet material, but is particularly useful in the production of alveolate sheet material such as corrugated thermoplastic sheet or I-beam structure thermoplastic sheet, particularly useful in the subsequent preparation of boxes and cartons among other uses. The sheet materials may be of any suitable thermoplastic material but polyolefin materials are preferred.
The invention will be described further, by way of example, with reference to the accompanying drawings, in which:
Figure l is a diagrammatic perspective view of a calibration unit for sheet material;
Figure 2 is a section on line A-A of figure l illustrating a traditional calibration plate; and Figure 3 is a section on line A-A of figure l of a calibration plate according to the invention.
Referring to the drawings, it can be seen from figure l that an extruded thermoplastic corrugated sheet lO is moved between an J
upper calibration plate 12 and a lower calibration plate 14 in order to cool it. The sheet is moved by a series of motorised rubber coated rollers (not shown).
CA 0222~ 1997-12-22 Conventionally, the calibration plates 12,14 have the internal structure similar to that shown in figure 2. That is, there are vacuum passages 16 for holding the sheet material 10 in close contact with the calibration plate and passageways 18 through which chilled fluid, such as water, is passed to effect cooling.
In accordance with the invention, however, as illustrated in figure 3, a calibration plate 12 comprises vacuum passages 16 as before but in this case the passageways 18 carrying the chilled fluid such as water are not totally enclosed within the body of the plate 12 but are open at the surface 20 of the plate.
In use, the surface of the sheet 10 in effect provides the missing wall of each passageway 18 but the water flow, being in direct contact with the sheet 10, ensures a rapid cooling effect. Moreover, sufficient water spreads across the whole surface of the sheet 10 to provide a lubricating effect.
Excess water is sucked up through the vacuum passageways 16.
More than one calibrator 12,14 can used as required by the sheet thickness and the intrinsic heat capacity of the material of the sheet. The calibrators can be fixed or movable according to the thickness of the sheet material and the production speed to improve heat dispersion on the surface, especially if the the material is not a good heat conductor and therefore needs extra time to disperse heat from the core of the sheet to the surface.
1 The system of the invention provides a very much more effective and rapid means of cooling a thermoplastic sheet and removes the "bottle neck" effect of previous calibration plates, enabling much more rapid production to be achieved.
Claims (7)
1. A calibration plate for the cooling of thermoplastic sheet material which comprises a plurality of passageways for chilled fluid characterised in that at least part of the or each passageway is open to the operative surface of the plate.
2. A plate as claimed in claim 1 in which vacuum passages are also provided to draw a vacuum and maintain the sheet to be cooled in close contact with the plate during the cooling operation.
3. A method of making a plastics sheet material which comprises extruding the material and passing over a calibration plate as claimed in either of claims 1 or 2.
4. A method as claimed in claim 3 in which the sheet material is an alveolate thermoplastic sheet material such as corrugated thermoplastic sheet or I-beam structure thermoplastic sheet.
5. A method as claimed in either of claims 3 or 4 in which the sheet material is of polyolefin.
6. A plate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
7. A method of making sheet material substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9512763.5A GB9512763D0 (en) | 1995-06-22 | 1995-06-22 | Cooling of sheet material |
| GB9512763.5 | 1995-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2225515A1 true CA2225515A1 (en) | 1997-01-09 |
Family
ID=10776533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002225515A Abandoned CA2225515A1 (en) | 1995-06-22 | 1996-06-18 | Cooling of sheet material |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0833731A1 (en) |
| JP (1) | JP2001503335A (en) |
| AU (1) | AU6130596A (en) |
| BG (1) | BG102140A (en) |
| CA (1) | CA2225515A1 (en) |
| GB (1) | GB9512763D0 (en) |
| HU (1) | HUP9901549A2 (en) |
| WO (1) | WO1997000765A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6174961B2 (en) * | 2013-09-30 | 2017-08-02 | 宇部エクシモ株式会社 | Sizing device for hollow plastic sheet and method for producing hollow plastic sheet using the same |
| CN106091732A (en) * | 2016-06-20 | 2016-11-09 | 安庆市鑫顺塑业有限公司 | A kind of film chiller |
| CN106003499A (en) * | 2016-06-20 | 2016-10-12 | 安庆市鑫顺塑业有限公司 | Plastic film blowing cooling device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3546745A (en) * | 1968-02-29 | 1970-12-15 | Phillips Petroleum Co | Extrudate sizing sleeve |
| US3668288A (en) * | 1968-11-18 | 1972-06-06 | Keiichi Takahashi | Method for making thermoplastic synthetic resin hollow structure articles |
| US3804567A (en) * | 1970-04-06 | 1974-04-16 | Chevron Res | Apparatus for cooling and sizing hot thermoplastic extrudates |
| FR2086713A5 (en) * | 1970-04-07 | 1971-12-31 | Plastival Sa | Drawing thermoplastic profiles - expanded by vacuum and calibrated |
| FR2093170A5 (en) * | 1970-06-04 | 1972-01-28 | Pont A Mousson | |
| US3812230A (en) * | 1970-09-29 | 1974-05-21 | Takan Kogyo Co Ltd | Method for continuously making a hollow board article of thermoplastic resin |
| DE2504190C3 (en) * | 1975-02-01 | 1984-08-16 | Dynamit Nobel Ag, 5210 Troisdorf | Method and device for calibrating an extruded profile made of thermoplastic material |
| DE3013020A1 (en) * | 1980-04-03 | 1981-10-08 | Werkzeugfabrik Standard Franz Müller GmbH & Co KG, 5210 Troisdorf | Cooling thermoplastic extrusions - material passes through tube with alternately vacuum holes and water-cooling grooves to minimise friction |
| FR2672006A1 (en) * | 1991-01-28 | 1992-07-31 | Eropol Finance Dev | DEVICE FOR CONFORMING A PRODUCT EXTRUDED TO A PASTY STATE. |
-
1995
- 1995-06-22 GB GBGB9512763.5A patent/GB9512763D0/en active Pending
-
1996
- 1996-06-18 HU HU9901549A patent/HUP9901549A2/en unknown
- 1996-06-18 WO PCT/GB1996/001452 patent/WO1997000765A1/en not_active Application Discontinuation
- 1996-06-18 JP JP50365697A patent/JP2001503335A/en active Pending
- 1996-06-18 EP EP96918748A patent/EP0833731A1/en not_active Withdrawn
- 1996-06-18 CA CA002225515A patent/CA2225515A1/en not_active Abandoned
- 1996-06-18 AU AU61305/96A patent/AU6130596A/en not_active Abandoned
-
1997
- 1997-12-22 BG BG102140A patent/BG102140A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| HUP9901549A2 (en) | 1999-08-30 |
| EP0833731A1 (en) | 1998-04-08 |
| JP2001503335A (en) | 2001-03-13 |
| AU6130596A (en) | 1997-01-22 |
| WO1997000765A1 (en) | 1997-01-09 |
| BG102140A (en) | 1999-01-29 |
| GB9512763D0 (en) | 1995-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |