EP0220341A1 - Appareil pour couper les panneaux à nervures - Google Patents

Appareil pour couper les panneaux à nervures Download PDF

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Publication number
EP0220341A1
EP0220341A1 EP85201759A EP85201759A EP0220341A1 EP 0220341 A1 EP0220341 A1 EP 0220341A1 EP 85201759 A EP85201759 A EP 85201759A EP 85201759 A EP85201759 A EP 85201759A EP 0220341 A1 EP0220341 A1 EP 0220341A1
Authority
EP
European Patent Office
Prior art keywords
knife
cutting
cut
web plate
strand
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
Application number
EP85201759A
Other languages
German (de)
English (en)
Other versions
EP0220341B1 (fr
Inventor
Alexander General Electric Plastics Hoekstra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to AT85201759T priority Critical patent/ATE36132T1/de
Priority to EP85201759A priority patent/EP0220341B1/fr
Priority to DE8585201759T priority patent/DE3564087D1/de
Publication of EP0220341A1 publication Critical patent/EP0220341A1/fr
Application granted granted Critical
Publication of EP0220341B1 publication Critical patent/EP0220341B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/56—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter
    • B26D1/60—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is mounted on a movable carriage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/10—Means for treating work or cutting member to facilitate cutting by heating

Definitions

  • the invention relates to a method for separating multi-wall sheets made of plastic.
  • Multi-wall sheets are known per se, for example from US-A-4,305,982 and EP-A-0108743.
  • Multi-wall sheets consist of two or more cover surfaces spaced parallel to one another and possibly intermediate surfaces and in each case parallel webs connecting the surfaces to one another. Such multi-wall sheets can be produced economically in the extrusion process.
  • the object of the invention is to avoid these disadvantages, in particular with a view to avoiding chip formation, but a high cutting speed should be possible.
  • this is achieved in a method of the type mentioned at the outset by moving a cutting edge heated to a temperature just above the melting temperature of the material of the web plate through the plate.
  • any chip formation during cutting is avoided, whereby the plate is melted and the melted material practically lies as a lubricating film between the cutting edge and the solid material.
  • This enables a high cutting speed due to the low friction and prevents deformation of the web plate due to the relatively low force required.
  • a multi-wall sheet made of polycarbonate can be separated with a knife heated to 200 ° to 300 ° C.
  • the cutting edge between the individual cuts is kept at the cutting temperature of the web plate which is just above the melting temperature of the material and the energy supply is increased with each cut to maintain the cutting temperature during the cut. This results in a particularly thin film of molten material, which results in particularly smooth and clean cut surfaces.
  • Another object of the invention is to propose a device for carrying out the method according to the invention.
  • the separating element is designed as a heated knife. With that a Web plate can be separated or cut in a very simple way by cutting while melting the material. The knife itself can be heated directly, or it can be heated indirectly.
  • the knife has a slot, preferably extending in the direction of its cutting edge, and its legs, which are separated from one another by this, are connected to a circuit.
  • a controller controlling the circuit is provided.
  • the controller is influenced by a sensor for detecting the length of the extruded strand for determining the interface.
  • a heatable chamber is arranged into which the knife can be inserted.
  • This solution is particularly suitable for making cuts with rather shorter cut lengths between which only relatively short breaks remain. This results in a particularly simple construction of the knife, which can be solid and therefore a high degree of stability can be achieved.
  • At least one heating device is attached to the knife, which is in heat-conducting contact therewith. This results in a relatively high thermal inertia for the knife in connection with the heating device, which can be of any design, so that the temperature of the cutting edge hardly drops, especially during relatively short cuts, and the knife with an almost constant supply of energy at the required cutting temperature can be held.
  • a further feature of the invention provides that the area penetrating into the multi-wall sheet to be cut of the knife has an area which is smaller than the sectional area of the cavities of the multi-wall sheet projected in the cutting direction.
  • the free end of the knife is inclined, preferably at an angle of 40-50 ° to the cutting edge.
  • This can the knife is designed to be relatively wide, as a result of which a corresponding stability of the knife is achieved.
  • the slanted free end of the knife which generally only penetrates into the strand to be cut with its free end region, ensures that only one part is cut at a time of each cavity is covered by the knife, whereby the supporting air can flow out even during the cutting of the strand.
  • the angle of 40-50 ° between the free end of the knife and its cutting edge represents a favorable compromise between a narrow design of the area of the knife penetrating into the strand to be cut and its stability.
  • a particularly simple construction of a device according to the invention results if the knife is held in an adjustable and fixable manner in a slide that can be moved in a guide. It is also possible to adjust the knife according to the thickness of the strand to be cut, so that only the free end area of the knife penetrates into the strand.
  • the granulate passes from the storage container 1 into a dryer 2 and from there to an extruder 3, where it is plasticized.
  • the plasticized mass exits through an extrusion die 4 which corresponds to the shape of the multi-wall sheet to be produced.
  • This extrusion nozzle 4 is supplied with air via a line 5, which is blown into the cavities of the multi-wall sheet and supports the two webs of each individual cavity and prevents the two webs from collapsing.
  • This extruded strand is brought to the intended dimension in the calibrator 6 in a known manner and is brought to a continuous furnace 8 and further to a laminating station 9 by means of conveyor rollers 7.
  • the extruded strand 12 then reaches the cutting device 10, after which the separated parts or plates are transported away by means of a conveyor belt 11.
  • the cutting device 10 consists of a guide 13 on which a carriage 14 can be moved.
  • the carriage is driven by means of a chain drive 15, to which the carriage 14 is connected and which is connected to a motor 30.
  • a support plate 16 is held adjustable and lockable.
  • the knife 17 is fastened on this support plate 16.
  • the guide 13 and the chain drive 15, 30 are held in a support 33, which can be adjusted in height on a slide 32 by means of a punch 31, which slide 32 can be moved on guides 34 in the longitudinal direction of the table 22 and thus of the strand 12.
  • This carriage 32 carries a motor 36 driving a pinion 35 which meshes with a toothed rack 37, as a result of which the carriage 32 can be driven reversibly.
  • the carriage 32 When cutting, the carriage 32 is moved transversely to the strand at the speed of the strand 12 in the feed direction thereof during the movement of the knife 17.
  • the bar 39 is lowered onto the strand 12 in the direction of the arrow 40 only during the cutting in order to prevent the strand from being lifted off the table 22.
  • the support 33 and thus the knife 17 are lowered below the upper edge of the table 22 and the carriage 32 is moved back to the starting point against the direction of advance of the strand.
  • the support 33 is raised again and the carriage 14 is moved transversely to the strand 12 by means of the chain drive 15 with simultaneous movement of the carriage 32 in the direction of advance of the strand 12.
  • the dimension of the slot 38 in the table 22 is dimensioned such that its width exceeds the feed of the strand during a cut.
  • the knife 17 is chamfered at its free end and has a slot 18.
  • the legs 19 of the knife 17 separated by this slot 18 are connected to a circuit which provides for the heating of the knife, this circuit being controlled by a controller (not shown).
  • the power supply to the knife 17 takes place via a cable 20 which is pulled out of a winding device 21 and wound up again by the latter, the cable being held under tension.
  • the knife 17 projects with its free end region through the slot 38 in the table 22 on the guides 23 for the strand 12 are arranged. The knife only cuts the strand 12 with its outermost end region.
  • the knife 17 covers an area which is substantially smaller than the cross section of the individual cavities 24 of the strand 12 or its area in the cutting plane, so that the supporting air can also escape from the cavities during the cut. However, this avoids an increase in pressure in the cavities 24 during the cut and thus also prevents the cavities from expanding in the area of the calibrator 6.
  • the slot 18 formed in the knife 17 can be raised so far in the direction of the cutting edge that it extends to just below the underside of the web plate to be cut. This has the advantage that an optimal heating of the cutting edge is ensured over its entire length.
  • the slot 18 can also be drawn up over the contact edge in the direction of the cutting edge, so that when cutting supporting air from the narrow channels, which could otherwise be covered by the knife width can emerge from the individual cavities 24.
  • the regulator of the circuit for heating the knife expediently works in such a way that the knife 17 is kept at the required cutting temperature of about 200 ° to 300 ° C. (for polycarbonate) by the passage of current, the current during each cut due to the increased Heat dissipation is increased.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Details Of Cutting Devices (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
EP85201759A 1985-10-30 1985-10-30 Appareil pour couper les panneaux à nervures Expired EP0220341B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT85201759T ATE36132T1 (de) 1985-10-30 1985-10-30 Vorrichtung zum trennen von stegplatten.
EP85201759A EP0220341B1 (fr) 1985-10-30 1985-10-30 Appareil pour couper les panneaux à nervures
DE8585201759T DE3564087D1 (en) 1985-10-30 1985-10-30 Device for severing ribbed boards

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85201759A EP0220341B1 (fr) 1985-10-30 1985-10-30 Appareil pour couper les panneaux à nervures

Publications (2)

Publication Number Publication Date
EP0220341A1 true EP0220341A1 (fr) 1987-05-06
EP0220341B1 EP0220341B1 (fr) 1988-08-03

Family

ID=8194073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85201759A Expired EP0220341B1 (fr) 1985-10-30 1985-10-30 Appareil pour couper les panneaux à nervures

Country Status (3)

Country Link
EP (1) EP0220341B1 (fr)
AT (1) ATE36132T1 (fr)
DE (1) DE3564087D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2615433A1 (fr) * 1987-05-19 1988-11-25 Kaysersberg Sa Dispositif de decoupe de plaques alveolaires en materiau thermoplastique
EP0604827A3 (fr) * 1992-12-30 1994-08-03 Meier Harald Consulting
GB2382321A (en) * 2001-11-21 2003-05-28 Doyen Medipharm Ltd Process and apparatus for cutting sheets
EP1195233A3 (fr) * 2000-10-05 2004-01-07 Kemac S.r.l. Dispositif de coupe de produits extrudés

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293721A (en) * 1941-08-11 1942-08-25 Gen Tire & Rubber Co Method of and apparatus for cutting and splicing thick rubber stock and the like
GB944617A (en) * 1962-03-02 1963-12-18 Barand Ltd Device for cutting soft tubing
US3259004A (en) * 1964-06-10 1966-07-05 Dow Chemical Co Band saw employing a copper blade
US3263540A (en) * 1964-05-27 1966-08-02 Dow Chemical Co Apparatus for slitting plastic film
FR2291832A1 (fr) * 1974-11-20 1976-06-18 Hoechst Ag Dispositif de coupe pour plaques a couches
DE2536685A1 (de) * 1975-08-18 1977-03-03 Meurer Franz Josef Verfahren und vorrichtung zum trennen von folien
FR2425922A1 (fr) * 1978-05-19 1979-12-14 Lair Jacques Perfectionnements apportes a un dispositif de coupe
DE3248536A1 (de) * 1982-12-29 1984-07-05 Zängl GmbH, 8000 München Schneidvorrichtung zum schneiden von platten aus thermoplastischem material

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293721A (en) * 1941-08-11 1942-08-25 Gen Tire & Rubber Co Method of and apparatus for cutting and splicing thick rubber stock and the like
GB944617A (en) * 1962-03-02 1963-12-18 Barand Ltd Device for cutting soft tubing
US3263540A (en) * 1964-05-27 1966-08-02 Dow Chemical Co Apparatus for slitting plastic film
US3259004A (en) * 1964-06-10 1966-07-05 Dow Chemical Co Band saw employing a copper blade
FR2291832A1 (fr) * 1974-11-20 1976-06-18 Hoechst Ag Dispositif de coupe pour plaques a couches
DE2536685A1 (de) * 1975-08-18 1977-03-03 Meurer Franz Josef Verfahren und vorrichtung zum trennen von folien
FR2425922A1 (fr) * 1978-05-19 1979-12-14 Lair Jacques Perfectionnements apportes a un dispositif de coupe
DE3248536A1 (de) * 1982-12-29 1984-07-05 Zängl GmbH, 8000 München Schneidvorrichtung zum schneiden von platten aus thermoplastischem material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2615433A1 (fr) * 1987-05-19 1988-11-25 Kaysersberg Sa Dispositif de decoupe de plaques alveolaires en materiau thermoplastique
EP0604827A3 (fr) * 1992-12-30 1994-08-03 Meier Harald Consulting
EP1195233A3 (fr) * 2000-10-05 2004-01-07 Kemac S.r.l. Dispositif de coupe de produits extrudés
GB2382321A (en) * 2001-11-21 2003-05-28 Doyen Medipharm Ltd Process and apparatus for cutting sheets

Also Published As

Publication number Publication date
ATE36132T1 (de) 1988-08-15
DE3564087D1 (en) 1988-09-08
EP0220341B1 (fr) 1988-08-03

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