EP0220341A1 - Device for severing ribbed boards - Google Patents

Device for severing ribbed boards 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
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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
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German (de)
French (fr)
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EP0220341B1 (en
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 DE8585201759T priority Critical patent/DE3564087D1/en
Priority to AT85201759T priority patent/ATE36132T1/en
Priority to EP85201759A priority patent/EP0220341B1/en
Publication of EP0220341A1 publication Critical patent/EP0220341A1/en
Application granted granted Critical
Publication of EP0220341B1 publication Critical patent/EP0220341B1/en
Expired legal-status Critical Current

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    • 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.

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  • 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)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Details Of Cutting Devices (AREA)

Abstract

1. Apparatus for the severing of freshly extruded webs of strutted boards (12), supporting air being introduced into the hollow spaces (24) within the web, the said apparatus comprising as severing element a heatable flat knife (17), the knife (17) being held adjustably and fixably in a charriage (14) which can travel in a guide (13), caracterised in that the surface area of that region of the knife (17) which penetrates into the strutted board (12) being cut, as viewed in the cut direction, is smaller than the area circumscribed by the edge regions of a hollow space (24).

Description

Die Erfindung bezieht sich auf ein Verfahren zum Trennen von Stegplatten aus Kunststoff.The invention relates to a method for separating multi-wall sheets made of plastic.

Stegplatten sind an und für sich bekannt, beispielsweise aus US-A-4,305,982 und EP-A-0108743. Stegplatten bestehen aus zwei oder mehreren im Abstand parallel zueinander angeordneten Deckflächen und eventuell Zwischenflächen und jeweils parallel zueinander angeordneten, die Flächen miteinander ver­bindenden Stegen. Derartige Stegplatten können wirtschaftlich im Extrusionsverfahren hergestellt wer­den.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.

Für das Schneiden von Kunststoffplatten sind Schlagscheren bekannt, welche das Material gleichzeitig über die gesamte Breite der Platte durchtrennen. Diese Anordnung hat den Nachteil, dass im Falle von Stegplatten diese durch die Schere zusammengedrückt werden und sich dadurch Veränderungen in der Profilierung ergeben. Diese Schneidvorrichtungen eignen sich daher nur für Vollmaterial oder für sehr dünne Stegplattenkonstruktionen, bei denen allfällige Verformungen eher akzeptabel sind.For the cutting of plastic plates, guillotine shears are known which cut through the material over the entire width of the plate at the same time. This arrangement has the disadvantage that, in the case of multi-wall sheets, they are pressed together by the scissors and this results in changes in the profile. These cutting devices are therefore only suitable for solid material or for very thin multi-wall sheet constructions in which any deformations are more acceptable.

Weiters wurde auch schon vorgeschlagen zum Schneiden von Stegplatten Messer mit Raumtemperatur zu verwenden. Mit diesen ergeben sich zumindest bei dünneren Stegplatten geringere Deformationen der Platten, doch ergeben sich bei der Verwendung von Messern in der Regel nur sehr kleine Schneidgeschwindigkeiten und beim Schneiden von dickeren Stegplatten sind erhebliche Deformationen nicht auszuschließen. Zur Vermeidung dieser Nachteile und zur Erreichung höherer Schneidgeschwindigkeiten wurde auch schon vorgeschlagen Sägen zu verwenden. Damit lassen sich zwar hohe Schnittgeschwindigkeiten erzielen, doch ergeben sich aufgrund der unvermeidlichen Spane Schwierigkeiten. So laden sich die Spane elektrisch auf und dringen in die Kanäle der Steplatten ein aus denen sie aus optischen Gründen entfernt werden müssen, was mit einem erheblichen Aufwand verbunden ist. Beim Durchtrennen von frisch extrudierten Strängen quer zu deren Längsrichtung zu Steg­platten ergeben sich aber noch weitere Nachteile, die sich aus dem Umstand ergeben, daß die Werkzeugbreite der Sägen größer als die Breite der Kanäle der Stegplatte ist, so daß beim Durchtrennen ein Verschließen der in der Regel mit Stützluft, die über die Extrusionsdüse eingebracht wird, beaufschlagten Kanäle erfolgt. Dies hat zur Folge, daß zufolge der ständig nachgelieferten Stützluft sich die Kanäle im Querschnitt kurzzeitig vergrößern, so daß am Ort des der Extrusionsdüse nachgeordneten Kalibrators kurzfristig ein vergrößerter Querschnitt kalibriert wird, was zu optischen Fehlern und somit zu einer Ausschußzone der Stegplatte führt.Furthermore, it has also been proposed to use knives with room temperature for cutting multi-wall sheets. With these, at least in the case of thinner multi-wall sheets, there are less deformations of the sheets, but when using knives there are generally only very low cutting speeds and considerable deformations cannot be ruled out when cutting thick multi-wall sheets. To avoid these disadvantages and to achieve higher cutting speeds, it has also been proposed to use saws. High cutting speeds can be achieved with this, but difficulties arise due to the inevitable chips. This way, the chips become electrically charged and penetrate into the channels of the step plates, from which they have to be removed for optical reasons, which is associated with considerable effort. When severing freshly extruded strands transversely to their longitudinal direction to multi-wall sheets, there are still further disadvantages, which result from the fact that the tool width of the saws is greater than the width of the channels of the multi-wall sheet, so that when cutting the in the As a rule, channels acted on with supporting air which is introduced via the extrusion nozzle. This has the consequence that, due to the constantly supplied supporting air, the channels temporarily enlarge in cross section, so that an enlarged cross section is calibrated briefly at the location of the calibrator downstream of the extrusion nozzle, which leads to optical errors and thus to a reject zone of the multi-wall sheet.

Aufgabe der Erfindung ist es, diese Nachteile zu vermeiden, insbesondere im Hinblick auf die Vermeidung der Spanbildung, wobei aber eine hohe Schnittgeschwindigkeit möglich sein soll.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.

Erfindungsgemäß wird dies bei einem Verfahren der ein­gangs erwähnten Art dadurch erreicht, daß eine auf eine knapp über der Schmelztemperatur des Materials der Steg­platte liegende Temperatur erwärmte Schneide durch die Platte bewegt wird. Auf diese Weise wird jedwede Spanbil­dung beim Schneiden vermieden, wobei die Platte ange­schmolzen wird und sich das angeschmolzene Material prak­tisch als Schmierfilm zwischen die Schneide und das feste Material legt. Dadurch wird aufgrund der geringen Reibung eine hohe Schnittgeschwindigkeit ermöglicht und aufgrund der relativ geringen erforderlichen Kraft eine Deformierung der Stegplatte vermieden. Beispielsweise kann eine Steg­platte aus Polycarbonat mit einem auf 200° bis 300°C er­wärmten Messer getrennt werden.According to the invention, 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. In this way, 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. For example, a multi-wall sheet made of polycarbonate can be separated with a knife heated to 200 ° to 300 ° C.

Um mit einer nur sehr kanpp über der Schmelztemperatur des Materials der Stegplatte liegenden Temperatur das Auslangen zu finden kann weiters vorgesehen sein, daß die Schneide zwischen den einzelnen Schnitten auf der knapp über der Schmelztemperatur des Materials liegenden Schneidtempe­ratur der Stegplatte liegenden Temperatur gehalten wird und die Energiezufuhr bei jedem Schnitt erhöht wird um die Schneidtemperatur während des Schnittes zu halten. Dadurch ergibt sich ein besonders dünner Film aus ge­schmolzenem Material, wodurch sich besonders glatte und saubere Schnittflächen ergeben.In order to find a temperature that is only very low above the melting temperature of the material of the web plate, it can further be provided that 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.

Ein weiters Ziel der Erfindung ist es eine Einrichtung zur Durchführung des erfindungsgemäßen Verfahrens vorzuschlagen. Bei einer Einrichtung, die eine Führung für ein antreib­bares Trennelement aufweist, wird daher gemäß einem weiteren Merkmal der Erfindung vorgeschlagen, daß das Trennelement als beheizbares Messer ausgebildet ist. Damit kann eine Stegplatte auf sehr einfache Weise durch Trennen unter Anschmelzen des Materials getrennt bzw. geschnitten werden. Dabei kann das Messer selbst, also direkt be­heizt sein, oder aber indirekt beheizt werden.Another object of the invention is to propose a device for carrying out the method according to the invention. In a device which has a guide for a drivable separating element, it is therefore proposed according to a further feature of the invention that 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.

Nach einem weiteren Merkmal der Erfindung kann vorgesehen sein, daß das Messer einen sich vorzugsweise in Richtung zu seiner Schneide erstreckenden Schlitz aufweist und seine durch diesen voneinander getrennten Schenkel an einen Stromkreis angeschlossen sind. Auf diese Weise er­gibt sich eine besonders einfache Konstruktion eines direkt beheizbaren Messers. Dabei ergibt sich auch die Möglichkeit rasch auf einen unterschiedlichen Energie­bedarf des Messer z.B. im Wartebetrieb und beim Schnitt reagieren zu können. In diesem Zusammenhang ist es vor­teilhaft, wenn ein den Stromkreis steuernder Regler vor­gesehen ist. Bei einem Einsatz einer solchen Schneidein­richtung bei einer Extrusionseinrichtung zur Herstellung von Stegplatten kann vorgesehen sein, daß der Regler von einem Fühler zur Erfassung der Länge des extrudierten Stranges zur Festlegung der Schnittstelle beeinflußt wird.According to a further feature of the invention, it can be provided that 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. This results in a particularly simple construction of a directly heatable knife. This also gives you the opportunity to quickly respond to a different energy requirement of the knife, e.g. to be able to react while waiting and during editing. In this context, it is advantageous if a controller controlling the circuit is provided. When such a cutting device is used in an extrusion device for the production of multi-wall sheets, it can be provided that the controller is influenced by a sensor for detecting the length of the extruded strand for determining the interface.

Bei einer anderen Ausführungsform einer erfindungsgemäßen Einrichtung kann vorgesehen sein, daß an mindestens einem Ende des Bewegungsweges des Messers eine beheizbare Kammer angeordnet ist in die das Messer einschiebbar ist. Diese Lösung eignet sich besonders für die Ausführung von Schnitten mit eher kürzeren Schnittlängen zwischen denen nur relativ kurze Pausen verbleiben. Dabei ergibt sich eine besonders einfache Konstruktion des Messers, wobei dieses massiv ausgebildet sein kann und deshalb ein hohes Maß an Stabilität erreicht werden kann.In another embodiment of a device according to the invention it can be provided that at least one end of the movement path of the knife 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.

Weiters kann vorgesehen sein, daß an dem Messer mindestens eine Heizeinrichtung befestigt ist, die mit diesem in wärmeleitendem Kontakt steht. Auf diese Weise ergibt sich für das Messer in Verbindung mit der Heizeinrichtung, die beliebig ausgebildet sein kann, eine relativ große thermische Trägheit, sodaß die Temperatur der Schneide, insbesondere während relativ kurzer Schnitte kaum ab­sinkt und das Messer mit nahezu konstanter Energiezu­fuhr auf der erforderlichen Schneidtemperatur gehalten werden kann.Furthermore, it can be provided that 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.

Um bei frisch extrudierten Stangen von Stegplatten, bei denen Stützluft in die Hohlräume des Stranges einge­bracht wird, eine Blockierung des Abströmens der Stützluft beim Zerschneiden des Stranges zu verhindern kann nach einem weiteren Merkmal der Erfindung vorgesehen sein, daß der in die zu schneidende Stegplatte eindringende Bereich des Messers eine Fläche aufweist, die kleiner als die in Schnittrichtung projizierte Schnittfläche der Hohlräume der Stegplatte ist. Durch diese Maßnahmen wird sichergestellt, daß die Stützluft auch während des Schneidens des extrudierten Stranges aus jedem der Hohl­räume abströmen kann. Dadurch wird ein Aufblähen der Hohl­räume in dem an die Extrusionsdüse anschließenden Bereich, bzw. im Bereich des diesen nachgeschalteten Kalibrators, in welchem Bereich die Stränge noch relativ weich und leicht verformbar sind, sicher verhindert, da es durch das relativ freie Abströmen der Stützluft zu keiner Drucker­höhung im Inneren des Hohlraumes kommt.In order to prevent blocking of the outflow of the supporting air when cutting the strand in freshly extruded bars of multi-wall sheets, in which supporting air is introduced into the cavities of the strand, 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. These measures ensure that the supporting air can flow out of each of the cavities even during the cutting of the extruded strand. This reliably prevents the cavities from expanding in the area adjoining the extrusion nozzle, or in the area of the calibrator downstream thereof, in which area the strands are still relatively soft and easily deformable, since there is none due to the relatively free outflow of the supporting air Pressure increase inside the cavity comes.

In diesem Zusammenhang ist es vorteilhaft, wenn das freie Ende des Messers schräg geneigt, vorzugsweise unter einem Winkel von 40-50° zur Schneidkante verläuft. Dadurch kann das Messer relativ breit ausgebildet werden, wodurch eine entsprechende Stabilität des Messers erreicht wird.Durch das abgeschrägte freie Ende des Messers, das in aller Regel nur mit seinem freien Endbereich in den zu schneidenden Strang eindringt, wird sichergestellt, daß beim Schneiden stets nur ein Teil eines jeden Hohlraumes durch das Messer abgedeckt wird, wodurch die Stützluft auch während des Schneidens des Stranges abströmen kann. Der Winkel von 40-50° zwischen dem freien Ende des Messers und dessen Schneidkante stellt einen günstigen Kompromiß zwischen einer schmalen Ausbildung des in den zu trennenden Strang eindringenden Bereiches des Messers und dessen Stabilität dar.In this context, it is advantageous if 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.

Eine besonders einfache Konstruktion einer erfindungsge­mäßen Einrichtung ergibt sich, wenn das Messer einstell- und festellbar in einem in einer Führung verfahrbaren Schlitten gehalten ist. Dabei ist es auch möglich das Messer entsprechend der Dicke des zu schneidenden Stran­ges einzustellen, sodaß stets nur der freie Endbereich des Messers in den Strang eindringt.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.

Die Erfindung wird nun an Hand der Zeichnung näher er­läutert.The invention will now be explained in more detail with reference to the drawing.

Dabei zeigt:

  • Fig.1 schematisch eine Einrichtung zur Herstellung von Stegplatten und
  • Fig.2 schematisch eine erfindungsgemäße Schneideinrichtung.
It shows:
  • 1 shows schematically a device for the production of multi-wall sheets and
  • 2 schematically shows a cutting device according to the invention.

Das Granulat gelangt vom Vorratsbehälter 1 in einen Trockner 2 und von diesem zu einem Extruder 3, wo es plastifiziert wird. Die plastifizierte Masse tritt durch eine Extrusionsdüse 4 aus, die der Form der herzustell­enden Stegplatte entspricht. Dieser Extrusionsdüse 4 wird über eine Leitung 5 Luft zugeführt, die in die Hohl­räume der Stegplatte eingeblasen wird und die beiden Stege jedes einzelnen Hohlraumes stützt und ein Zusammenfallen der beiden Stege ver­hindert. Dieser extrudierte Strang wird im Kalibrator 6 in bekannter Weise auf das vorgesehene Maß gebracht und wird mittels Förderrollen 7 zu einem Durchlaufofen 8 und weiter zu einer Kaschierstation 9 gebracht. Anschließend gelangt der extrudierte Strang 12 zur Schneideinrichtung 10 wonach die abgetrennten Teile bzw. Platten mittels eines Förderbandes 11 abtransportiert werden.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.

Die Schneideinrichtung 10 besteht, wie aus Fig.2 ersicht­lich ist, aus einer Führung 13 auf der ein Schlitten 14 verfahrbar ist. Der Antrieb für den Schlitten erfolgt mittels eines Kettentriebes 15, mit dem der Schlitten 14 verbunden ist und der mit einem Motor 30 verbunden ist. Auf dem Schlitten 14 ist eine Tragplatte 16 höhenverstell­bar und feststellbar gehalten. Auf dieser Tragplatte 16 ist das Messer 17 befestigt.As can be seen from FIG. 2, 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. On the slide 14, a support plate 16 is held adjustable and lockable. The knife 17 is fastened on this support plate 16.

Die Führung 13 und der Kettentrieb 15,30 sind in einem mittels Stempel 31 höhenverstellbar auf einem Schlitten 32 gehaltenen Support 33 gehalten, welcher Schlitten 32 auf Führungen 34 in Längsrichtung des Tisches 22 und damit des Stranges 12 verfahrbar ist. Dieser Schlitten 32 trägt einen ein Ritzel 35 antreibenden Motor 36, das mit einer Zahnstange 37 kämmt, wodurch der Schlitten 32 reversibel antreibbar ist.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.

Beim Schneiden wird der Schlitten 32 während der Be­wegung des Messers 17 quer zum Strang mit der Ge­schwindigkeit des Stranges 12 in dessen Vorschubrich­tung bewegt. Dabei ist, allerdings nur während des Schneidens der Balken 39 in Richtung des Pfeiles 40 auf den Strang 12 abgesenkt, um ein Abheben des Stranges vom Tisch 22 zu verhindern.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. Here, however, 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.

Nach Beendigung eines Schnittes wird der Support 33 und damit das Messer 17 unter die Oberkante des Tisches 22 abgesenkt und der Schlitten 32 entgegen der Vorschubrichtung des Stranges auf den Ausgangspunkt zurückverfahren. Zu Beginn eines neuen Schnittes wird der Support 33 wieder angehoben und der Schlitten 14 mittels des Kettentriebes 15 quer zum Strang 12 bei gleichzeitiger Bewegung des Schlittens 32 in Vorschub­richtung des Stranges 12 bewegt. Dadurch können recht­winkelige Platten vom Strang 12 abgetrennt werden ohne daß der Extrusionsvorgang angehalten werden müßte. Die Abmessung des Schlitzes 38 im Tisch 22 ist dabei so bemessen, daß seine Breite den Vorschub des Stranges während eines Schnittes übersteigt.After completion of a cut, 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. At the beginning of a new cut, 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. As a result, rectangular plates can be separated from the strand 12 without the extrusion process having to be stopped. 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.

Das Messer 17 ist an seinem freien Ende abgeschrägt und weist einen Schlitz 18 auf. Die durch diesen Schlitz 18 getrennten Schenkel 19 des Messers 17 sind an einen Stromkreis angeschlossen, der für die Beheizung des Messers sorgt, wobei dieser Stromkreis von einem nicht dargestellten Regler gesteuert ist. Die Stromzufuhr zum Messer 17 erfolgt über ein Kabel 20, das aus einer Auf­wickeleinrichtung 21 herausgezogen und von dieser wieder aufgewickelt wird, wobei das Kabel unter Zugspannung ge­halten wird. Wie aus Fig.2 ersichtlich ist ragt das Messer 17 mit seinem freien Endbereich durch den Schlitz 38 im Tisch 22 auf dem Führungen 23 für den Strang 12 angeordnet sind. Das Messer durchtrennt den Strang 12 lediglich mit seinem äußersten Endbereich. Mit diesem Endbereich deckt das Messer 17 eine gegenüber dem Quer­schnitt der einzelnen Hohlräume 24 des Stranges 12 bzw. deren Fläche in der Schnittebene wesentlich kleinere Fläche ab, sodaß die Stützluft aus den Hohlräumen auch während des Schnittes austreten kann. Damit wird aber ein Druckanstieg in den Hohlräumen 24 während des Schnittes vermieden und damit auch ein Aufblähen der Hohlräume im Bereich des Kalibrators 6 vermieden.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. As can be seen from FIG. 2, 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. With this 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.

Der im Messer 17 ausgebildete Schlitz 18 kann in Richtung der Schneide so weit hochgeführt sein, daß er bis knapp an die Unterseite der zu durchtrennenden Stegplatte heranreicht. Dies hat den Vorteil, daß eine optimale Erhitzung der Schneide über ihre gesamte Länge gewährleistet ist. Um bei verhältnismäßig kleiner Querschnittsbreite der einzelnen Hohlräume 24 eines Stranges ein sicheres austreten der Stützluft zu ge­währleisten kann der Schlitz 18 auch über die Auflage­kante in Richtung zur Schneide hochgezogen werden, sodaß beim Schneiden Stützluft aus den schmalen Kanälen, welche ansonst von der Messerbreite abgedeckt werden könnte aus den einzelnen Hohlräumen 24 austreten kann.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. In order to ensure a safe escape of the supporting air with a relatively small cross-sectional width of the individual cavities 24 of a strand, 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.

Der Regler des Stromkreises zur Beheizung des Messers arbeitet zweckmäßiger Weise derart, daß das Messer 17 durch den Stromdurchgang auf der erforderlichen Schneid­temperatur von ca. 200° bis 300°C (für Polycarbonat) ge­halten wird, wobei der Strom während eines jeden Schnittes aufgrund der erhöhten Wärmeabfuhr erhöht wird.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.

Claims (10)

1. Verfahren zum Trennen von Stegplatten aus Kunst­stoff,
dadurch gekennzeichnet,
daß eine auf eine knapp über der Schmelztemperatur des Materials der Stegplatte liegende Temperatur erwärmte Schneide durch die Platte bewegt wird.1. Process for separating plastic multi-wall sheets,
characterized,
that a heated to a temperature just above the melting temperature of the material of the web plate is moved through the plate. 2. Verfahren nach Anspruch 1, dadurch gekannzeichnet, daß die Schneide zwischen den einzelnen Schnitten auf der knapp über der Schmelztemperatur des Materials liegenden Schneidtemperatur der Stegplatte liegenden Temperatur gehalten wird und die Energiezufuhr bei je­dem Schnitt erhöht wird um die Schneidtemperatur während des Schnittes zu halten.2. The method according to claim 1, characterized in that the cutting edge between the individual cuts is kept at the cutting temperature of the web plate lying just above the melting temperature of the material and the energy supply is increased for each cut in order to maintain the cutting temperature during the cutting. 3. Einrichtung zur Durchführung des Verfahrens nach Anspruch 1 oder 2, die eine Führung für ein antreib­bares Trennelement aufweist,
dadurch gekennzeichnet,
daß das Trennelement als beheizbares Messer (17) aus­gebildet ist.3. Device for carrying out the method according to claim 1 or 2, which has a guide for a drivable separating element,
characterized,
that the separating element is designed as a heated knife (17). 4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das Messer (17) einen sich vorzugsweise in Richtung zu seiner Schneide erstreckenden Schlitz (18) aufweist und seine durch diesen voneinander getrennten Schenkel (19) an einen Stromkreis angeschlossen sind.4. Device according to claim 3, characterized in that the knife (17) has a preferably extending in the direction of its cutting slot (18) and its legs (19) separated by this are connected to a circuit. 5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß ein den Stromkreis steuernder Regler vorgesehen ist.5. Device according to claim 4, characterized in that a controller controlling the circuit is provided. 6. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß an mindestens einem Ende des Bewegungsweges des Messer (17) eine beheizbare Kammer angeordnet ist in die das Messer einschiebbar ist.6. Device according to claim 3, characterized in that a heatable chamber is arranged in at least one end of the path of movement of the knife (17) into which the knife can be inserted. 7. Einrichtung nach einem der Ansprüche 3 bis 5, da­durch gekennzeichnet, daß der in die zu schneidende Stegplatte (12) eindringende Bereich des Messers (17) eine Fläche aufweist, die kleiner als die in Schnitt­richtung projizierte Schnittfläche der Hohlräume (24) der Stegplatte ist.7. Device according to one of claims 3 to 5, characterized in that the area of the knife (17) penetrating into the web plate (12) to be cut has an area which is smaller than the sectional area of the cavities (24) of the web plate projected in the cutting direction is. 8. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, daß das freie Ende des Messers (17) schräg geneigt, vor­zugsweise unter einem Winkel von 40-50° zur Schneidkante verläuft.8. Device according to claim 7, characterized in that the free end of the knife (17) is inclined, preferably at an angle of 40-50 ° to the cutting edge. 9. Einrichtung nach einem der Ansprüche 3 bis 8, da­durch gekennzeichnet, daß das Messer (17) einstell- und feststellbar in einem in einer Führung (13) verfahr­baren Schlitten (14) gehalten ist.9. Device according to one of claims 3 to 8, characterized in that the knife (17) adjustable and lockable in a in a guide (13) movable carriage (14) is held. 10. Einrichtung nach einem der Ansprüche 3, 7 bis 9, dadurch gekennzeichnet, daß an dem Messer (17) mindestens eine Heizeinrichtung befestigt ist, die mit diesem in wärmeleitendem Kontakt steht.10. Device according to one of claims 3, 7 to 9, characterized in that at least one heating device is attached to the knife (17), which is in heat-conducting contact therewith.
EP85201759A 1985-10-30 1985-10-30 Device for severing ribbed boards Expired EP0220341B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8585201759T DE3564087D1 (en) 1985-10-30 1985-10-30 Device for severing ribbed boards
AT85201759T ATE36132T1 (en) 1985-10-30 1985-10-30 DEVICE FOR SEPARATING WEB PLATES.
EP85201759A EP0220341B1 (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 (en) 1985-10-30 1985-10-30 Device for severing ribbed boards

Publications (2)

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

Family

ID=8194073

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Application Number Title Priority Date Filing Date
EP85201759A Expired EP0220341B1 (en) 1985-10-30 1985-10-30 Device for severing ribbed boards

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EP (1) EP0220341B1 (en)
AT (1) ATE36132T1 (en)
DE (1) DE3564087D1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2615433A1 (en) * 1987-05-19 1988-11-25 Kaysersberg Sa Device for cutting cellular panels out of thermoplastic material
EP0604827A2 (en) * 1992-12-30 1994-07-06 Harald Meier Consulting Device for creating a groove in a gear which is designated to drive a tape
EP1195233A2 (en) * 2000-10-05 2002-04-10 Kemac S.r.l. A cutter device for extruded products
GB2382321A (en) * 2001-11-21 2003-05-28 Doyen Medipharm Ltd Process and apparatus for cutting sheets

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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 (en) * 1974-11-20 1976-06-18 Hoechst Ag CUTTING DEVICE FOR LAYER PLATES
DE2536685A1 (en) * 1975-08-18 1977-03-03 Meurer Franz Josef Plastic film separation by thermal action in unwinder - with rapid separation without carbonisation or burning of film
FR2425922A1 (en) * 1978-05-19 1979-12-14 Lair Jacques Cutter device associated with heat source - comprising electrical resistance element controlled by potentiometer
DE3248536A1 (en) * 1982-12-29 1984-07-05 Zängl GmbH, 8000 München Cutting device for cutting panels from thermoplastic 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 (en) * 1974-11-20 1976-06-18 Hoechst Ag CUTTING DEVICE FOR LAYER PLATES
DE2536685A1 (en) * 1975-08-18 1977-03-03 Meurer Franz Josef Plastic film separation by thermal action in unwinder - with rapid separation without carbonisation or burning of film
FR2425922A1 (en) * 1978-05-19 1979-12-14 Lair Jacques Cutter device associated with heat source - comprising electrical resistance element controlled by potentiometer
DE3248536A1 (en) * 1982-12-29 1984-07-05 Zängl GmbH, 8000 München Cutting device for cutting panels from thermoplastic material

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2615433A1 (en) * 1987-05-19 1988-11-25 Kaysersberg Sa Device for cutting cellular panels out of thermoplastic material
EP0604827A2 (en) * 1992-12-30 1994-07-06 Harald Meier Consulting Device for creating a groove in a gear which is designated to drive a tape
EP0604827A3 (en) * 1992-12-30 1994-08-03 Meier Harald Consulting
EP1195233A2 (en) * 2000-10-05 2002-04-10 Kemac S.r.l. A cutter device for extruded products
EP1195233A3 (en) * 2000-10-05 2004-01-07 Kemac S.r.l. A cutter device for extruded products
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 (en) 1988-08-15
EP0220341B1 (en) 1988-08-03
DE3564087D1 (en) 1988-09-08

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