EP0083741B1 - Verfahren und Vorrichtung zum Herstellen eines Wellenteils - Google Patents

Verfahren und Vorrichtung zum Herstellen eines Wellenteils Download PDF

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Publication number
EP0083741B1
EP0083741B1 EP82111389A EP82111389A EP0083741B1 EP 0083741 B1 EP0083741 B1 EP 0083741B1 EP 82111389 A EP82111389 A EP 82111389A EP 82111389 A EP82111389 A EP 82111389A EP 0083741 B1 EP0083741 B1 EP 0083741B1
Authority
EP
European Patent Office
Prior art keywords
web
pressing means
backing
backing web
pressing
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.)
Expired
Application number
EP82111389A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0083741A1 (de
Inventor
Otto J. Hofer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT82111389T priority Critical patent/ATE18370T1/de
Publication of EP0083741A1 publication Critical patent/EP0083741A1/de
Application granted granted Critical
Publication of EP0083741B1 publication Critical patent/EP0083741B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/29—Making webs in which the channel of each corrugation is transverse to the web feed by making use of rods, e.g. co-operating with a toothed cylinder combined with uniting the corrugated web to flat webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/247—Making webs in which the channel of each corrugation is transverse to the web feed by reciprocating members

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 8.
  • Such methods and devices are generally known and customary and are used in the packaging industry for the production of packaging inserts, but also for the production of decorative elements.
  • a method has become known from US-A-3402092 Wiesinger, in which support elements are glued onto a carrier web at regular intervals transversely to the web direction.
  • the carrier web prepared in this way passes a molding station in cycles, at which an upper web is fed from above.
  • Two pressure devices which can be lowered from above, press the top web over the support elements and onto the carrier web, a connection taking place.
  • the two pressure devices are resiliently connected to one another in such a way that first the first and then the second pressure device touches the top web.
  • the support elements remain on the shaft part between the carrier web and the top web, which is obviously a serious disadvantage.
  • the production of the shaft parts becomes complicated and cumbersome because the support elements have to be glued on with a separate device.
  • the shaft parts themselves become too heavy and, due to the complicated manufacturing process, also too expensive. Changing the shaft configuration and the shaft spacing is practically impossible.
  • a manufacturing method for shaft parts has become known in which deformation elements are introduced between the carrier web and the top web, which can be removed again after the deformation of the top web.
  • the top web is deformed using a toothed roller. Before the feed opening of the toothed roller, the deformation elements are placed on the carrier web by hand or with mechanical means not described in detail. The toothed roller deforms the top web around the deformation elements which have to be pulled out again after leaving the toothed roller. Obviously, an efficient production of an endless shaft part is not possible in this way. In addition, holding the deformation elements running along with the two tracks is likely to present considerable difficulties.
  • Another object of the invention is to make the conversion of the production to shaft parts of a different configuration as simple as possible.
  • this object is achieved by a method which has the features of claim 1.
  • the deformation element that can be inserted and retracted laterally on a plane transverse to the feed direction of the two webs solves the difficult problem of deformation of the top web in the simplest way.
  • the deformation takes place directly on the spot above the carrier web, without deformation elements having to be placed or glued to the carrier web in front of the forming station.
  • first the first pressure device and then the second pressure device touches the top web. This causes the upper web to be bent cleanly around the inserted deformation element.
  • the second pressure device is only raised after the first pressure device, so that the upper web is held in place while the deformation element is being pulled back. In this way it is prevented that tensile stresses originating from the inclined upper web can tear open the newly formed shaft.
  • the method according to the invention can be implemented in a particularly simple manner in that both the deformation element and also a first pressure device located behind the deformation element in the feed direction are shifted into their working position, in which the deformation element is located between the carrier web and the top web and the first pressure device counteracts the top web the carrier web presses, and then a second pressure device lying in front of the deformation element in the feed direction is pressed against the top web in such a way that it is stretched or folded over the deformation element and pressed against the carrier web and thereby in each case in at least a section of the pressure area of the deformation elements with the Carrier web is connected.
  • the top web automatically adapts to the length of the feed steps, the configuration of the deformation element and the pressure devices due to the course of the deformation process and can be easily pulled off a roll.
  • the deformation element is first introduced between the top web and the carrier web and, at the same time, the first pressure device is pressed against the top web and the deformation element. This ensures crease-free deformation and in particular also allows the upper web to be deformed in accordance with the surface configuration of the deformation element and pressure devices.
  • the process cycle can be further shortened if each connection point between the top web and the carrier web is acted upon by both the first pressure device and the second pressure device, and if the connection between the top web and the bottom web takes place during the pressing of both pressure devices.
  • This enables z. B. the provisional connection of top web and carrier web in the area of the first pressure device and the subsequent permanent connection in the area of the second pressure device. Since the connection process is particularly time-consuming both when using adhesive or other drying or heat-curing or, in the general way, physically or chemically activatable connection media, as well as with welding processes or similar measures, the time required for each pressing or connection process can be shortened in many cases. In addition, this ensures according to the invention that more time is available for the pressing and connecting process under the first pressing device, since the first pressing device is pressed against the upper web in front of the second pressing device.
  • the connection of top web and carrier web can be carried out very particularly advantageously if a heat-activatable medium is used to produce the connection and if the carrier web and / or top web are heated in the area of the pressing devices during the pressing process.
  • a heat-activatable medium such as. B. thermoplastic adhesives and the like, can either be applied to the carrier web and / or top web during the advance of these, or are already on at least one of the webs. All that is required to connect the top web and carrier web is heating in the region of at least one pressure device. If heating takes place in the area of both pressure devices, it is evident that with the first pressure device a general heating of the adhesive and a provisional connection can be achieved, while in the area of the second pressure device the complete plasticization and permanent connection takes place.
  • stamped connections other folded connections or positive connections and connections with mechanical connecting elements can also be used.
  • Different waveforms can be produced in the simplest way on one and the same shaft part by the invention if the feed step length of a feed step is changed compared to a previous feed step.
  • the adaptation of the upper part or the upper track to the changed configuration takes place automatically.
  • Shaft parts with different wave shapes can also be produced if the surface configuration of the deformation element is changed in at least one deformation step compared to the shape during a preceding deformation step. This can be done e.g. B. achieve that multi-part deformation elements are used, or that different deformation elements are provided, which can be introduced alternately between the top web and carrier web.
  • a deformation of the top web is to be achieved laterally on the deformation element or on the deformation element, this can be achieved particularly simply by pressing the pressure device laterally against the deformation element and / or onto the deformation element. In this way, practically any surface configurations of the top web can be produced.
  • top web is provided with waves or deformations of different heights and / or surface configurations in the transverse direction. This allows the use of the shaft part for packaging parts of different shapes.
  • the invention can be implemented particularly simply by means of a device which has the features in the characterizing part of claim 8. Since the deformation element is an integral part of the device, it can be guided and moved precisely, so that precise wave formation is ensured even when the carrier web is advanced rapidly.
  • the pressure devices which can be activated independently of one another enable the two pressure devices to be set down or withdrawn in the reverse order in each case. This enables the top web to be deformed in an optimally clean manner and protects the newly formed shafts from destruction, in particular caused by frictional forces when the deformation element is pulled back or by tension in the obliquely fed top web.
  • the laterally insertable deformation elements can be changed in an optimally simple manner to produce different shaft part configurations. Because the molding device with the pressure devices lies above the deformation element, the shaping can be carried out on or above the deformation element and the pressing or connecting process of the upper web and carrier web can be achieved.
  • the cyclical control of the pressure devices, the feed arrangement and the deformation element means no difficulties for the person skilled in the art.
  • the sequence control can be mechanical or can be implemented electronically and also hydraulically or pneumatically in a manner known per se.
  • the adjustment of the forming station can be accomplished particularly easily if the feed device has a drive device with an arrangement for the stepless adjustment of the feed path of the feed device. In this way, the feed path of a feed step can be adapted as desired to the configuration of the deformation element.
  • the practical implementation of the invention is particularly simple if the feed device has a holding device for holding the carrier web during the feed movement.
  • the feed device can carry out a simple lifting movement with a front and a rear detent position, the helte device for holding and transporting the carrier web being engaged only during the feed movement, but disengaging in the front detent position, so that the reverse stroke done empty.
  • the latching positions can limit the forward and backward stroke, respectively, and allow the upper web to be deformed and the upper web and carrier web to be connected at the forming station.
  • Both the stroke setting and the formation of sufficient locking positions can be achieved particularly advantageously if a six-link coupling gear with two locking positions is used.
  • the control and adjustment of the feed device can also be designed according to the invention in a particularly finely adjustable and adjustable manner if the drive device has a stepper motor drive with an adjustable pulse number and / or pulse length.
  • the use of the stepper motor has the great advantage that, in a manner known per se, both the feed speed and the feed stroke and the duration of the detent positions can be regulated practically indefinitely.
  • Shaft parts with a different configuration in the transverse direction can be produced particularly easily if at least one of the pressure devices is divided into at least two differently shaped sections and / or at least one of the pressure devices is divided into two approximately adjacent pressure elements with different shapes, and if the deformation element accordingly is divided in the transverse direction into at least two differently shaped sections.
  • z. B. generate shaft parts in which the waves taper or widen in the transverse direction or are divided into gradually increasing or decreasing sections.
  • the adaptability to different wave forms can be further improved if two deformation elements that can be inserted from both sides between the upper web and the carrier web are provided. This also increases the cycle speed, since in this case the deformation elements only have to be inserted half way from both sides.
  • an upper web 2 is connected to a carrier web 3 on a forming station 1.
  • the individual process steps I to VI run as follows: During step I, a first pressure device 4 and a second pressure device 5 are in their working position, in which they press the top web 2 against the carrier web 3 and at the same time bring about the connection of the two webs .
  • An adhesive (not shown) is applied to the carrier web 3, which establishes the connection during the pressing process.
  • a deformation element 6 is located in its working position between the first pressure device 4 and the second pressure device 5 in such a way that the upper web 2 is stretched over the deformation element 6 in a wave-like manner.
  • a lateral stamp 7 presses against the upper web 2 and the second pressing device 5 and thereby causes the upper web 2 to be folded cleanly over the deformation element 6.
  • Method step 11 shows how first the first pressure device 4 is brought out of engagement with the upper web 2 and then the deformation element 6 is laterally withdrawn from the closed shaft section.
  • Method step III shows how the stamp 7 is then also withdrawn, the second pressure device 5 is brought out of engagement with the upper web 2 and at the same time the carrier web 3 by one step further, i. H. is promoted to the right in the drawing.
  • Method step IV shows how the deformation element 6 is then shifted again between the carrier web 3 and the top web 2, and then the first pressing device 4 is pressed into the shaft section in which the second pressing device 5 was located in the previous working step.
  • This double use of a pressure device at the same connection point ensures that, on the one hand, the top web 2 is pressed and held firmly against the carrier web 3, so that during the subsequent intervention of the second pressure device 5 during the method steps V and VI, the top web 2 is held and via the Deformation element 6 can be tensioned without loosening an already established connection of top web 2 and carrier web 3.
  • the double pressure causes an improved connection of the carrier web 3 and the top web 2.
  • Method step V shows how the top web 2 is stretched over the deformation element 6 and thereby deformed.
  • Method step VI shows, analogous to method step I, the pressing and connecting of top web 2 and carrier web 3 by the second pressing device 5. Obviously, the top web 2 is automatically retightened while the carrier web 3 is being advanced, without any special conveying having to take place.
  • the upper web 3 can be pulled off a roll in a manner known per se, the material being able to be guided in loops or over dancer rolls and the like in order to avoid jerky tensile loads during the advance.
  • Figure 2 shows the two pressure devices 4 and 5 on an enlarged scale.
  • the side bevel shown in the drawing allows unimpeded supply of the upper web 2 past the second pressure device 5.
  • the pressure devices 4 and 5 are fastened to two hydraulic press arrangements 10, 11 by means of push rods 8, which in turn are arranged on a frame 9.
  • the molding station 1 lies vertically under the pressure devices 4 and 5 and has a deformation table 12 which is provided with a heating arrangement 13 in the region of the deformation element 6.
  • a motor 14 is provided for laterally displacing the deformation element 6.
  • a feed device 15 with a drive device 16 and a gripper 17 is provided on the forming station 1 in order to convey the carrier web 3 step by step according to FIG. 1 on the forming station 1.
  • a sequence control device 18 is provided which issues the corresponding control commands in the order of the method steps according to FIG. 1 via control lines 19.
  • Such sequence control devices for controlling press arrangements, for. B. via corresponding valves or motors via appropriate switching devices are generally known and do not require further explanation here.
  • the feed device is driven by means of a stepper motor drive which has a pulse generator 21 and a stepper motor 22.
  • the pulse duration and the pulse frequency of the pulse generator 21 are adjustable in a manner known per se, so that both the lifting speed and the stroke length can be set during a feed step of the grippers 17.
  • the feed of the carrier web 3 can be adjusted and adapted as desired.
  • the grippers 17 are pivoted against the carrier web 3 during the forward stroke, so that they grip it and convey it forward.
  • the grippers 17 are lifted off the carrier web 3, so that they are withdrawn empty during the reverse stroke.
  • the Ver pivot the gripper 17 by a magnet arrangement, not shown. Accordingly, during the reverse stroke, the carrier web 3 remains in the feed position last reached, the process sequence according to FIG. 1 taking place.
  • Figure 6 shows two pressure devices 4 and 5 and a deformation element 6 for producing a shaft part with a modified configuration. It is evident that the upper web 2 is not only stretched over the deformation element 6, but is pressed against it by the pressure devices 4 and 5. In this way, the shape shown can be achieved without difficulty.
  • FIG. 7 shows an arrangement with three pressure devices 4, 4a and 5.
  • the first pressure device 4 is first brought into its engaged position. Sodanri is followed by the additional pressure device 4a, which presses the upper web 2 against the deformation element 6. This ensures that the desired formation of edges 23 is achieved and at the same time prevents the upper web from wrinkling, as could be the case if the second pressure device 5 were lowered in front of the additional pressure device 4a. Otherwise, the deformation in the exemplary embodiment according to FIG. 7 proceeds analogously to the process sequence shown in FIG. 1.
  • FIG. 8 shows a modified exemplary embodiment in which the additional pressure device 4a is mechanically connected to the pressure device 5. Nevertheless, the same sequence as in the embodiment according to FIG. 7 also takes place in the embodiment according to FIG. 8. This means that first the first pressure device 4 engages, and then during the downward movement the additional pressure device 4a is pressed against the upper web 2 or the deformation element 6 and that only then does the second pressure device 5 engage.
  • the additional pressure device 4a is mounted on the second pressure device 5 so as to be longitudinally displaceable and is pressed into a lower position by a spring 24, so that the additional pressure device 4a in this deep position first onto the top web 2 or the deformation element 6 presses and then during the further lowering of the second pressing device 5 against the force of the spring 24 is displaced relative to the second pressing device 5.
  • FIG. 9 shows a modified exemplary embodiment, in which the deformation element 6 is provided with a lateral recess 25 in order to achieve a corresponding configuration of the shaft part.
  • the first pressure device 4 is first pressed against the upper web 2 or the deformation element 6.
  • the second pressure device 5 is then lowered and laterally displaced by the stamp 7 and pressed into the depression 25 of the deformation element 6.
  • any side surface configurations of the shaft part can be shaped in the simplest way.
  • FIGS. 10 and 11 a shaft part with shaft sections of different heights is produced.
  • the deformation element 6 is subdivided and has an upper section 6a.
  • FIG. 10 shows a pressing process in which only the lower part of the deformation element 6 is engaged and a lower section of the shaft part is formed accordingly.
  • the upper section 6a of the deformation element 6 is also inserted between the upper web 2 and the carrier web 3, so that a higher shaft part is produced.
  • the introduction of the deformation element 6 with or without the upper section 6a can be controlled in any order by appropriately designing the sequence control device 18 (FIG. 4).
  • FIG. 12 shows a carrier web 3 which is provided with two strips 26 of a thermoplastic adhesive.
  • the carrier web 3 is heated in the area of the heating arrangement 13, which is designed as an electrical resistance heater, so that the adhesive strips 26 are softened and activated.
  • the connection between the carrier web and the top web can be achieved by simple pressing by means of the pressure devices 4 and 5.
  • the heating arrangement 13 is located in the area of both pressure devices 4 and 5, so that the heating of the carrier web 3 in the area of the first pressure device can take place for a relatively short period of time, which leads to a provisional connection of the upper web 2 and carrier web 3 is sufficient. If the still heated carrier web 3 is then transported further in the subsequent method step (FIG. 1) in such a way that the shaft section located under the second pressing device 5 during the first step passes under the first pressing device 4, the still heated connection point of the upper web 2 and carrier web 3 becomes again pressed together, which then ensures a permanent connection.
  • FIG. 13 shows a carrier web 3 which is provided with a continuous coating 27 made of thermoplastic material.
  • the coating 27 serves on the one hand to protect the surface of the carrier web 3, which thereby becomes insensitive to water and moisture. At the same time, however, softening in the area of the connection point with the upper web 2 is achieved by heating by means of the heating arrangement 13 and permanent connection is made possible by pressing on by means of the pressure devices 4 and 5.
  • Figure 14 shows an embodiment, at which the top web 2 consists entirely of thermoplastic material.
  • the connection to the carrier web 3 is achieved by softening in the area of the heating arrangement 13 or the pressure devices 4 and 5.
  • FIG. 15 shows an exemplary embodiment of a shaft part, in which the feed steps of successive sections of the shaft part are enlarged in a ratio of 1: 2 by appropriate actuation of the feed device 15.
  • the shaft part can thus be optimally adapted to the needs of the parts to be packaged.
  • FIG. 16 shows an exemplary embodiment in which two top webs 2a and 2b are arranged on a carrier web 3.
  • the configuration formed by the top web 2a corresponds to the exemplary embodiment according to FIG. 7 and the deformation element 6c and a first pair of pressure devices 4, 5 (not shown) are designed as shown there.
  • the configuration formed by the upper web 2b corresponds to the shaft part according to FIG. 1 and the deformation element 6d and a second pair of pressure devices 4, 5 (not shown) are designed accordingly.
  • both two deformation elements 6c and 6d which can be inserted from opposite sides, and two adjacent pairs of pressure devices 4, 5 are provided for carrying out the deformation process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Making Paper Articles (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Laminated Bodies (AREA)
EP82111389A 1982-01-13 1982-12-08 Verfahren und Vorrichtung zum Herstellen eines Wellenteils Expired EP0083741B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82111389T ATE18370T1 (de) 1982-01-13 1982-12-08 Verfahren und vorrichtung zum herstellen eines wellenteils.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH175/82 1982-01-13
CH17582 1982-01-13

Publications (2)

Publication Number Publication Date
EP0083741A1 EP0083741A1 (de) 1983-07-20
EP0083741B1 true EP0083741B1 (de) 1986-03-05

Family

ID=4180970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111389A Expired EP0083741B1 (de) 1982-01-13 1982-12-08 Verfahren und Vorrichtung zum Herstellen eines Wellenteils

Country Status (8)

Country Link
US (1) US4894113A (enrdf_load_stackoverflow)
EP (1) EP0083741B1 (enrdf_load_stackoverflow)
JP (1) JPS58134733A (enrdf_load_stackoverflow)
KR (1) KR880001938B1 (enrdf_load_stackoverflow)
AT (1) ATE18370T1 (enrdf_load_stackoverflow)
AU (1) AU549348B2 (enrdf_load_stackoverflow)
CA (1) CA1220985A (enrdf_load_stackoverflow)
DE (1) DE3269734D1 (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115746A3 (de) * 1983-02-02 1984-09-26 Interrondo AG Verfahren zum Herstellen von Schachteln und nach dem Verfahren hergestellte Schachteln
GB9103378D0 (en) * 1991-02-19 1991-04-03 British Aerospace Progressive moulding and curing of composite materials
JP2008055877A (ja) * 2006-09-04 2008-03-13 Ishibashi:Kk 段ボールの製造方法
JP2012116548A (ja) * 2010-12-02 2012-06-21 Fujiyama Giken:Kk ロンドレーション容器およびロンドレーション容器の製造方法
SE539417C2 (en) * 2016-03-07 2017-09-19 Eksjö Dev Ab Machine and method for producing packaging inserts
CN109367136A (zh) * 2018-12-11 2019-02-22 天津市津东华明纸箱厂 一种纸箱板压楞成型裁切机

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE548274A (enrdf_load_stackoverflow) *
FR743452A (enrdf_load_stackoverflow) * 1933-03-31
DE494407C (de) * 1928-09-22 1930-03-22 Alfred Fickert Verpackung fuer Ampullen, Flaschen und aehnliche zerbrechliche Gegenstaende
CH263453A (de) * 1948-02-02 1949-08-31 Cafag Cartonnagenfabrik Freibu Ampullenverpackung.
FR1120571A (fr) * 1954-02-10 1956-07-09 Frobenius A G Garniture de boîte
BE544778A (enrdf_load_stackoverflow) * 1955-01-28 1900-01-01
FR1128896A (fr) * 1955-07-20 1957-01-11 Packmat A G Procédé et machine pour onduler des bandes de carton ou autre matériel
DE1038748B (de) * 1956-08-02 1958-09-11 Core Reissverschluss G M B H Vorrichtung zum Falten von gelochten Kunststoffstreifen fuer Reissverschluesse
CH386922A (de) * 1961-08-15 1965-01-15 Sig Schweiz Industrieges Packung mit einzelne Kammern begrenzenden Zwischenwänden, Verfahren zum Herstellen der Packung und Vorrichtung zur Durchführung des Verfahrens
US3402092A (en) * 1964-11-13 1968-09-17 Lymba Products Ltd Apparatus for adhesively securing flexible covering material to a backing sheet
US3575768A (en) * 1968-04-01 1971-04-20 Budd Co Machine for making corrugated fibre
JPS5217859B1 (enrdf_load_stackoverflow) * 1969-02-19 1977-05-18
US3685931A (en) * 1971-11-29 1972-08-22 Gen Electric Apparatus for producing a corrugated member
US4093483A (en) * 1977-02-09 1978-06-06 Plastic Products, Inc. Process and apparatus for forming pleats in a draw drape
US4108703A (en) * 1977-05-20 1978-08-22 Kovach Leslie J Method and apparatus for producing double-walled thermoplastic pipe
US4288278A (en) * 1978-12-08 1981-09-08 Daicel Chemical Industries Ltd. Apparatus for continuously producing pleated semipermeable membrane elements

Also Published As

Publication number Publication date
ATE18370T1 (de) 1986-03-15
AU9118982A (en) 1983-07-21
JPS58134733A (ja) 1983-08-11
DE3269734D1 (en) 1986-04-10
EP0083741A1 (de) 1983-07-20
AU549348B2 (en) 1986-01-23
KR880001938B1 (ko) 1988-10-04
KR840003068A (ko) 1984-08-13
US4894113A (en) 1990-01-16
JPS6343224B2 (enrdf_load_stackoverflow) 1988-08-29
CA1220985A (en) 1987-04-28

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