GB2253810A - A process and cross-cutter for the product of sandwich elements with overlapping strips - Google Patents
A process and cross-cutter for the product of sandwich elements with overlapping strips Download PDFInfo
- Publication number
- GB2253810A GB2253810A GB9203699A GB9203699A GB2253810A GB 2253810 A GB2253810 A GB 2253810A GB 9203699 A GB9203699 A GB 9203699A GB 9203699 A GB9203699 A GB 9203699A GB 2253810 A GB2253810 A GB 2253810A
- Authority
- GB
- United Kingdom
- Prior art keywords
- saw
- cut
- band saw
- cross
- cutter
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 24
- 238000005520 cutting process Methods 0.000 claims abstract description 21
- 239000006261 foam material Substances 0.000 claims abstract description 20
- 238000007373 indentation Methods 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000006378 damage Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B15/00—Band or strap sawing machines specially designed for length cutting of trunks
- B27B15/06—Band or strap sawing machines specially designed for length cutting of trunks in combined arrangement with circular saws for performing simultaneously several sawing procedures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D53/00—Machines or devices for sawing with strap saw-blades which are effectively endless in use, e.g. for contour cutting
- B23D53/005—Machines or devices for sawing with strap saw-blades which are effectively endless in use, e.g. for contour cutting with a plurality of band saw blades or band saw blades having plural cutting zones, e.g. contiguous oppositely-moving saw blade portions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D53/00—Machines or devices for sawing with strap saw-blades which are effectively endless in use, e.g. for contour cutting
- B23D53/04—Machines or devices for sawing with strap saw-blades which are effectively endless in use, e.g. for contour cutting with the wheels carrying the strap mounted shiftably or swingingly, i.e. during sawing, other than merely for adjustment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D55/00—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts
- B23D55/08—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts of devices for guiding or feeding strap saw blades
- B23D55/082—Devices for guiding strap saw blades
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/56—After-treatment of articles, e.g. for altering the shape
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
In the production of sandwich elements with overlapping strips from a strand (2) comprising at least one rigid outer layer (29) and a foam material core (28), during cutting the formation of a bun is avoided by performing a separating cut by a band saw (3) and an indentation cut by a circular saw (25). The cutting zone (9) of the band saw blade (4) can be turned through 180 DEG by a turning device (12), and a turning device (30) is provided for the circular saw (25). The band saw blade (4) cuts right through the strand (2), whereas the circular saw (25) is adjusted so that it severs the upper outer layer (27) and the foam material core (28) of the strand (2) so that the lower outer layer (29) remains as an overlapping strip. <IMAGE>
Description
225381o A Process and a Cross-Cutter for the Production of Sandwich
Elements with Overlapping trips.
The invention relates to a process and a cross-cutter for the production of sandwich elements with overlapping strips by cross-cutting a continuously supplied strand of at least one rigid outer layer and a foam material layer or foam material core, where two cuts are made using saws, one cut being executed as a separating cut and the other cut being executed as an indentation cut which severs the foam material layer or foam material core and optionally the further outer layer.
Sandwich elements without overlapping strips are generally produced on continuously operating double conveyor belt systems, at the outlet of which the sandwich elements are separated in the required length from the produced strand using a cross-cutter. Such a cross-cutter moves at the production speed of the strand and executes the separating cut transversely to the strand by means of a band saw, where the saw is either returned to the initial position without cutting or is turned and thereby assumes the position to execute a cut also in the opposite direction (DE-A-35 00 751).
For the production of sandwich elements with. overlapping strips, in accordance with EP-B-0 185 275 three circular saws are used which are not turned but, for the return run, are raised and moved backwards above the sandwich element. Of these circular saws, one serves to execute the indentation cut and two serve to execute the separating cut. To enable the foam layer to be easily removed between the separating cut and the indentation cut, prior to the 1 1 delivery of the compound which forms the foam material the rigid outer layer is coated with a parting agent in the region of the later overlapping strip, where this coating position is co-ordinated with the cutting position, taking 5 into account the production speed.
Generally in the production of sandwich elements two outer layers are provided although only one is to be used, for example because in the case of the production of a foam layer consisting of a liquid polyurethane reaction mixture the double conveyor belt becomes soiled unless an accompanying paper web protects the apparatus components. Aluminium sheet, steel sheet, pressboard plates, synthetic resin sheets and the like are used as rigid outer layers. In the case of such rigid outer layers, a burr forms during cutting with a circular saw. If the sandwich elements have no overlapping strips, such a burr is less troublesome because it is directed into the foam material core. In the case of sandwich elements with overlapping strips, because the foam material core is absent in this zone the burr is exposed and can cause injury to the operating personnel and during the stacking and transport of the sandwich elements can cause surface scratches and soiling as a result of crumbling.
The aim of the invention is to discover a process and a cross-cutter whereby, in particular in the case of the separating cut, burr formation is avoided or substantially reduced in production of sandwich elements with overlapping strips.
This aim is fulfilled in that the separating cut is executed using a band saw and the indentation cut is executed using a circular saw.
That which is surprising in respect of the invention consists in the combination of the two types of saw known per se. Thus the band saw executes a very fine, substantially burr-free cut; in the case of the production HE 93 2 of sandwich elements with one rigid outer layer the circular saw produces no burr because the rigid outer layer is not severed. On a "sofC outer layer, such as for example paper, a burr either does not form or is harmless. Even when both outer layers are composed of rigid material, the burr is not problematic in the case of the indentation cut because it is directed into the foam material core.
Although the problem has existed for many decades, it is only now that this surprisingly simple solution has been discovered.
Preferably after each cut both the band saw and the circular saw are turned by 180.
This has the advantage that cutting can take place in each direction, whereby higher produ.ction speeds can be attained and sandwich elements of longer lengths can be severed. In accordance with a first embodiment of the turning process, the cutting side of the blade of the band saw is turned by 180. 20 Alternatively, both the upwardly extending and the downwardly extending sides of the band saw blade are conducted through the cutting gap and after the cut the band saw blade guide, which is formed by two guide rollers, is turned by 180. 25 Whereas the first embodiment requires a longer saw blade, in the second embodiment the return run of the blade can damage the cut edges. If necessary it is possible for the indent. ation cut viewed in the direction of production of the strand to be executed by displacing the circular saw relative to the band saw in advance of or following the separating cut.
It would even be possible to provide a respective circular saw on both sides 'of the band saw in order to execute two indentation cuts simultaneously. If necessary one indentation cut could also be executed from below, so HE 93 3 that an overlapping strip remains on the upper outer layer. The new cross- cutter for the production of sandwich elements with overlapping strips from a continuously supplied strand of at least one rigid outer layer and a foam material layer or foam material core is based on two saws which are displaceable transversely to the strand and of which one saw is designed as a separating cut saw and the other saw is designed as an indentation cut saw.
The novelty of the invention consists in that the separating,cut saw is a band saw and the indentation cut saw is a circular saw.
By the use of a band saw a very fine, burr-free separating cut is obtained, whilst the circular saw either produces no burr whatsoever in the case of only one rigid outer layer, or in the case of two rigid outer layers the burr which forms is not troublesome as it is directed into the foam material core. Preferably both the band saw and the circular saw are equipped with turning devices for 180. 20 In this way it is possible to turn the saws after each cut so that cutting can take place in each direction, whereby it is also possible to sever short sandwich elements at high production speeds. In accordance with a special embodiment, the turning device of the band saw is formed by a turning device for the cutting side of the band saw blade. In accordance with another embodiment the guide of the band saw blade is formed by an upper guide roller and a lower guide roller, where the mountings for these guide rollers, which are rotatable by 180, form the turning device. The circular saw can preferably be positioned considered in the direction of production of the strand in advance of or following the band saw. 35 The form of the arrangement can be governed by structure; HE 93 4 however it can also be governed by production technology, i.e. can depend upon whether the overlapping strip is to be arranged at the head end or the base end of the sandwich element, and the sandwich -elements cannot simply be turned 5 because of different profiling of the longitudinal sides.
The new cross-cutter is illustrated purely schematically in the drawing in the form of two exemplary embodiments and will be explained in detail in the following. In the drawing:
Fig. 1 is a side view of the cross-cutter in accordance with a first exemplary embodiment and Fig. 2 is a side view of the cross-cutter in accordance with a second exemplary embodiment.
In Fig. 1 the cross-cutter comprises a transversely displaceable, U-shaped frame 1 which moves together with the strand 2 at the production speed of said strand 2, during the cutting operation. This frame I forms the support f rame of a band saw 3, the band saw blade 4 of which extends over guide rollers 5, 6, 7 and a drive roller 8. In the cutting zone 9 the band saw blade 4 is rotated by 90 by pairs of guide rollers 10, 11 so that it extends in the cutting direction (from left to right in the drawing). The cutting zone 9 of the band saw blade 4 is also assigned a turning device 12 which comprises drive motors 15, 16 attached to supports 13, 14 and band saw blade guides 17, 18, where the drive motors 15, 16 can interact with pinions 19, 20 via gear wheels 21, 22, fixed to the band saw blade guides 17, 18, and turn the band saw blade 4 by 180' on command. At an end plate 23 of the frame 1 a circular saw 25 is mounted on a holder 24. The blade 26 of the circular saw 25 is adjusted such that it severs the upper outer layer 27 and the foam material core 28 of the strand 2 so that the lower outer layer 29 remains as an overlapping strip,- the size of which corresponds to the interval between the two cuts. Here again a turning HE 93 device 30 is provided. The turning device 30 comprises, in particular, the mounting 31 of the blade 26 which is provided with a gear wheel 32. The gear wheel 32 engages with the pinion 33 of a drive motor 34 which operates on command. By means of the turning devices 12, 30 it is possible to cut both during the forwards movement and the return movement of the frame 1. The holder 24 is mounted on the end plate 23 in guides 35 so as to be transversely displaceable and so that the circular saw 25 considered in the direction of production - can be positioned in advance of or following the band saw 3. The circular saw 25 is retained on a vertical guide 37 so as to be adjustable in height by means of a lifting device 36.
In a simplified embodiment in which no turning devices are provided, cutting can be effected only in one direction so that the frame 1 must always return to the initial position without cutting. In this case the band saw passes through a gap in that the previously cut sandwich element is temporarily accelerated, the circular saw is raised and moves backwards above the sandwich element.
The embodiment according to Fig. 2 differs essentially from that according to Fig. 1 in that the band saw blade 41 is not moved backwards by the frame 42 but is merely guided via an upper and a lower guide roller 43 and 44, of which one is driven; also in that the turning device 45 consists in that the mountings 46, 47 of these guide rollers 43, 44 are mounted so as to be rotatable by 180 and comprise gear wheels 48, 49 which engage with pinions 50, '51 of drive motors 52, 53. These drive motors 52, 53 simultaneously receive the command for the turning process.
It will be clear that in the case of both embodiments the actuation of the cross-cutter must be co-ordinated with the production speed of the overall apparatus, which however does not form the subject of the invention.
HE 93 6
Claims (12)
1. A process f or the production of sandwich elements with overlapping strips by cross-cutting a continuously supplied strand of at least one rigid outer layer and a foam material layer or foam material core, where the two cuts are executed by saws, one cut being executed as a separating cut and the other cut being executed as an indentation cut which severs the foam material layer of foam material core and optionally a further outer layer, wherein the separating cut is executed by a band saw and the indentation cut is executed by a circular saw.
2. A process as claimed in Claim 1, wherein after each cut both the band saw and the circular saw are turned by 1800.
3. A process as claimed in claim 2, wherein the cutting side of the blade of the band saw is turned by 1800.
4. A process as claimed in Claim 2. wherein both the upwardly extending and downwardly extending sides of the band saw are conducted through the cutting gap. and after the cut the guide of the band saw blade, which is formed by two guide rollers, is turned by 1800.
5. A process as claimed in one of Claims 1 to 4, wherein the indentation cut - viewed in the direction of production of the strand - can be executed in advance of or following the separating cut.
HE 93 7
6. A cross-cutter f or the production of sandwich elements with overlapping strips from a continuously supplied strand of at least one rigid outer layer and a foam material layer or foam material core, comprising two saws which are displaceable transversely to the strand, and of which one saw is designed as a separating cut saw and the other saw is designed as an indentation cut saw.. wherein the separating cut saw is a band saw and the indentation cut saw is a circular saw.
7. A cross-cutter as claimed in Claim 6, wherein both the band saw and the circular saw are equipped with turning devices for 1800.
is
8. A cross-cutter as claimed in claim 7, wherein the turning device of the band saw consists of a turning device for the cutting side of the band saw blade.
9. A cross-cutter as claimed in claim 7, wherein the guide of the band saw blade consists of an upper guide roller and a lower guide roller, where the mountings, which are rotatable by 180c, of these guide rollers form the turning device.
10. A cross-cutter as claimed in one of Claims 6 to 9, wherein the circular saw can be positioned in advance of or following the band saw. considered in the direction of production of the strand.
HE 93 a
11. A process f or the production of sandwich elements as described herein with reference to the accompanying drawings.
12. A cross-cutter f or the production of sandwich elements as described herein with reference to the accompanying drawings HE 93 9
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4108636A DE4108636A1 (en) | 1991-03-16 | 1991-03-16 | METHOD AND CUTTER FOR PRODUCING SANDWICH ELEMENTS WITH OVERLAP STRIP |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9203699D0 GB9203699D0 (en) | 1992-04-08 |
| GB2253810A true GB2253810A (en) | 1992-09-23 |
| GB2253810B GB2253810B (en) | 1994-04-27 |
Family
ID=6427483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9203699A Expired - Fee Related GB2253810B (en) | 1991-03-16 | 1992-02-20 | A process and cross-cutter for the production of sandwich elements with overlapping strips |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE4108636A1 (en) |
| GB (1) | GB2253810B (en) |
| IT (1) | IT1254247B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2332697A1 (en) * | 2009-04-21 | 2010-02-10 | Juan Lloveras Calvo | Laminated material including a central core made from high-density foam and at least one stainless steel sheet, and production and machining methods |
| ITRA20110034A1 (en) * | 2011-12-15 | 2013-06-16 | Gemar S R L | MULTIFUNCTIONAL MACHINE WITH NUMERICAL CONTROL. |
| WO2017089295A1 (en) * | 2015-11-27 | 2017-06-01 | Oms Automation S.R.L. | Apparatus for manufacturing panels made of foamed plastic material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0185275A2 (en) * | 1984-12-12 | 1986-06-25 | Siempelkamp Handling Systeme GmbH & Co. | Method and apparatus for producing rigid foam panels, especially polyurethane ones |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3434671A1 (en) * | 1983-09-23 | 1985-05-15 | Elastogran Maschinenbau GmbH, 2844 Lemförde | Device for the transverse cutting of a continuously produced plastics foam strand |
| DE3500751A1 (en) * | 1985-01-11 | 1986-07-17 | Maschinenfabrik Hennecke Gmbh, 5090 Leverkusen | Process and device for cutting off sections from a continuously fed profile preferably consisting of a composite web of a foam core laminated with - in particular rigid - cover layers |
-
1991
- 1991-03-16 DE DE4108636A patent/DE4108636A1/en not_active Ceased
-
1992
- 1992-02-20 GB GB9203699A patent/GB2253810B/en not_active Expired - Fee Related
- 1992-03-10 IT ITMI920549A patent/IT1254247B/en active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0185275A2 (en) * | 1984-12-12 | 1986-06-25 | Siempelkamp Handling Systeme GmbH & Co. | Method and apparatus for producing rigid foam panels, especially polyurethane ones |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2332697A1 (en) * | 2009-04-21 | 2010-02-10 | Juan Lloveras Calvo | Laminated material including a central core made from high-density foam and at least one stainless steel sheet, and production and machining methods |
| ITRA20110034A1 (en) * | 2011-12-15 | 2013-06-16 | Gemar S R L | MULTIFUNCTIONAL MACHINE WITH NUMERICAL CONTROL. |
| WO2017089295A1 (en) * | 2015-11-27 | 2017-06-01 | Oms Automation S.R.L. | Apparatus for manufacturing panels made of foamed plastic material |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2253810B (en) | 1994-04-27 |
| IT1254247B (en) | 1995-09-14 |
| ITMI920549A0 (en) | 1992-03-10 |
| DE4108636A1 (en) | 1992-09-17 |
| GB9203699D0 (en) | 1992-04-08 |
| ITMI920549A1 (en) | 1993-09-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20090220 |