EP0009294A1 - Verfahren und Vorrichtung zum Strecken von netzartigen Materialbahnen - Google Patents

Verfahren und Vorrichtung zum Strecken von netzartigen Materialbahnen Download PDF

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Publication number
EP0009294A1
EP0009294A1 EP79200532A EP79200532A EP0009294A1 EP 0009294 A1 EP0009294 A1 EP 0009294A1 EP 79200532 A EP79200532 A EP 79200532A EP 79200532 A EP79200532 A EP 79200532A EP 0009294 A1 EP0009294 A1 EP 0009294A1
Authority
EP
European Patent Office
Prior art keywords
web
pairs
rollers
clamping rollers
width
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.)
Ceased
Application number
EP79200532A
Other languages
English (en)
French (fr)
Inventor
Johann Josef Jansen
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.)
Stamicarbon BV
Original Assignee
Stamicarbon BV
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 Stamicarbon BV filed Critical Stamicarbon BV
Publication of EP0009294A1 publication Critical patent/EP0009294A1/de
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
    • D06C3/06—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics by rotary disc, roller, or like apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/512—Changing form of handled material
    • B65H2301/5124—Stretching; Tentering
    • B65H2301/51242—Stretching transversely; Tentering
    • B65H2301/512422—Stretching transversely; Tentering involving roller pair acting on edge of web

Definitions

  • the invention relates to a method for continuous lateral stretching of films to a constant width.
  • the invention relates in particular to a method for lateral stretching of reticulate film material to a constant width.
  • 'reticulate sheet material is understood film material with a large number of openings, offering very little resistance to lateral stretching.
  • Such stretching may be done, for instance, as described in the French patent specification No.1.020.595 and in the Swiss patent specification No.461.419, by means of a bent stretching bar along which the film is drawn.
  • the degree of stretching depends on the bending radius of the stretching bar, the tensile force in the film, and the coefficient of friction between te film and the stretching bar.
  • Another method makes use of a stretching roller, as represented in the Dutch patent application No.7015574, fig. 3.
  • the circumference of this roller is fitted with single-threaded or multiple-headed helical ridges that extend towards the two extremities of the roller and are arranged so that their pitches are opposite.
  • This stretching roller acts as a kind of screwing conveyor that forces the fibres towards the ends of the roller.
  • Still another method is that employing the so-called banana roller.
  • This roller consists of a bent shaft to which rollers have been fitted independently of each other.
  • a sleeve of flexible material is slipped around these rollers. If a sheet under tension is passed over the flexible outer sleeve in a direction normal to the length of the roller, the outer sleeve will rotate owing to friction. The sleeve then makes an outward movement between the point with the smallest and the point with the greatest bending radius. The film material follows this movement owing to friction.
  • a device that is widely used in the textile and plastics industries for lateral stretching of fabrics and films and with which very great stretching forces can be applied is the so-called stretching frame.
  • a device like this has been described in, inter alia, the Netherlands patent application.No.6802553.
  • This device consists of two chain tracks running in guides according to a desired pattern. Both chains are provided with clamps or needles that grip the film and carry it along in the direction of transport of the chains.
  • the width of the stretched film depends on the distance between the chain tracks at the delivery end.
  • a problem encountered in this method of stretching is to make allowance for the reduction in length that occurs during lateral stretching.
  • the US patent No.3.838.481 relates to a device for stretching of fabrics or similar material, the side edges of the web being passed over tensioning rollers fitted alongside the web.
  • tensioning rollers are motor-driven and the degree of stretching is adjusted by changing the speed of rotation of the rollers and, secondly, by changing the angular position of the rollers. This results in translation of the web together with the rollers, so that the web is tensioned and also assumes a different position.
  • the force exerted by the web on the rollers is enlarged or diminished, so that the transversal transport of the web proportionally increases or decreases, respectively.
  • the points of rotation of the rollers are situated relatively far from the side edges of the web, so that changing of the angular position of the rollers causes undesired deformations and displacements of the side edges. This method is therefore unsuitable for accurate width control of reticulate sheet.
  • the film In further processing of the stretched material, which may be used for various purposes, i.a. for reinforcement of clothing, building material, etc., it is of importance that the film has a constant width over its entire length. If it has not, the film will have to be cut to the desired length, which results in much waste, while deviations in width may furthermore cause differences in strength owing to irregular stretching.
  • the object of the invention is to eliminate said drawbacks and to provide a method of stretching film material to a desired constant width.
  • this is achieved by passing the unstretched web of reticulate film - possibly via guideand/or tensioning rollers - to pairs of clamping rollers mounted on either side of the web which clamp the web at the desired width and which are so operated by a controlling mechanism that, when the desired web width is deviated from, the angle included by the clamping roller shafts and the sides of the web in the plane of the web is readjusted.
  • clamping rollers By 'pairs of clamping rollers' is understood sets of rollers of which the treads are in contact with each other so as to clamp a web of film material which is fed through. These pairs of clamping rollers have appeared to be very suitable for lateral stretching of reticulate film material to a constant width.
  • Readjustment of the angle included by the clamping roller shafts and the sides of the web of reticulate material is effected by turning the clamping rollers around an vertical axis which is situated within the width of the clamping rollers and preferably coincides with or is near to the desired position of the side edges of the stretched material.
  • the controlling mechanism for readjustment of the angle included by the clamping roller shafts and the sides Q f the web in the plane of the web may consist of photocells that are mounted after the pairs of clamping rollers, as seen in the direction of transport of the web, and which, when the desired web width is deviated from, send a signal to a transmitter coupled to a servo mechanism that operates a hydraulic cylinder whose piston is pivoted to the pairs of clamping rollers, so that the angle included by the clamping roller shafts and the sides of the web in the plane of the web can be readjusted.
  • Another possibility of controlling said readjustment consists in that photocells have been mounted before the pairs of clamping rollers, as seen in the direction of transport of the web, which ensure that the side edges of the web, run, e.g. midway between the pairs of clamping rollers fitted on either side of the web. When deviations occur, readjustment is effected in the same way as indicated in the first-mentioned possibility of readjustment.
  • pairs of rollers at either side of the web, which pairs of rollers are driven independently of each other and between which the side edges of the web are clamped.
  • the driving mechanisms of the pairs of rollers are controlled by photocells positioned at either side of the web, before the first-mentioned pairs of clamping rollers.
  • the relevant photocell When during the stretching operation one of the sides of the web sags, for instance because an excess of material is fed to one of the sides, the relevant photocell will send a signal to the driving mechanism which causes the relevant pair of rollers to run faster until the side edge has been readjusted. It is evident that when both side edges sag, the photocells at both sides will respond, speeding up the driving mechanisms of both pairs of rollers until readjustment has been effected.
  • side stretchers for the side edges of the web, which have not been stretched yet.
  • These stretchers consist of two small plates, one placed at a small distance above the other, between which the side of the sheet are passed.
  • the upper or the lower plate is provided with little holes, oriented laterally as well as in the direction of transport, through which a medium, for instance air or water, can be blown in order to stretch the side edges of the sheet.
  • chain guides By means of chain guides, the stretched reticulate film is subsequently passed through a stabilization unit. The distance between the chains at either side of the stabilization unit can be varied, if necessary.
  • the method according to the invention is particularly suitable for lateral stretching of a material that offers little resistance in this respect, e.g. a maximum force of 1 N on the pairs of clamping rollers at a lateral stretch of 1000%.
  • the invention also relates to a device for effecting the method according to the invention.
  • the device according to the invention consists of:
  • the device further comprises a device for stabilization of the stretched web at the desired width, chain guides for the web in the stabilization device, guide rollers for the stabilized web, and, finally, a winding reel and pressure roller for the stabilized web of reticulate material.
  • On the reel 1 is a web, with a width varying from a few centimetres to several metres, of polypropylene film fibrillated by, e.g., rollers with pins, which is unwound at a rate of up to about 150 m/min., say 50 m/min., and is passed to the pairs of clamping rollers 5 and 6, possibly by way of a guide roller 2, a tensioning roller 3 and another guide roller 4. It is also possible to feed more than one web of the film material, one above the other in which case a corresponding number of pairs of tensioning rollers, one above the other, may be applied.
  • a package consisting of several webs of the film, one on top of the other and connected to each other at the side edges, is stretched by the method according to the invention.
  • the pairs of clamping rollers 5 and 6 are mounted on either side of the web at a relative distance corresponding to the desired web width after stretching, e.g. from one to several metres.
  • the stretched web leaving the pairs of rollers 5 and 6 is passed over the driven rollers 7a, 7a' and 7b, 7b' and the side stretchers 28 and 29 to the stabilization device 8, in which the reticulate film is clamped in between chains at the sides and passed through the device 8 in which the web is stabilized at the desired width thermally or by spraying on a stabilizing agent.
  • the side edges of the separate webs can also be welded together after the stretching operation and the webs thus united are passed through the stabilizer as one single web.
  • the stabilized web leaves the device 8 and is wound onto reel 11 by way of rollers 9, 9' and 10.
  • Roller 12 acts as a pressure roller and can slide in guide 13.
  • the tension in the web is controlled by a tensioning roller 3, which is known in itself, coupled to the electromagnetic brake 15 via potentiometer 14.
  • the desired width of the stretched web is constantly checked by the photocells 16 and 17.
  • these photocells 16 and 17 send a signal to the transmitter 18 and 19 and then to the servo mechanisms 20 and 21, each of which operates a hydraulic cylinder 22 or 23, whose piston rod 24 or 25 is pivoted to the pairs of clamping rollers 5 and 6, so that the angle included by these rollers and the sides of the web in the plane of the web can be readjusted, which enables the web to be stretched to the correct width.
  • the axes of rotation 5' and 6' of the clamping rollers coincide with or are near to the desired position of the side edges of the material to be stretched.
  • the photocell 30 When one of the side edges la or lb sags, for instance as indicated by the dotted line 1b', the photocell 30 will send a signal to the driving mechanism of the rollers 7b and 7b' which speeds up the rollers until readjustment has been effected. In that case, the photocell 31 will send a signal to the driving mechanisms of the rollers 7a and 7a' so that these are speeded up until readjustment has been effected.
  • photocells 16' and 17' can send such a signal to a transmitter, servo mechanisme and a hydraulic cylinder whose piston is coupled to the pairs of clamping rollers by way of a guide that the relative distance between the pairs of clamping rollers 5 and 6 is readjusted when the web width is deviated from.
  • This possibility of readjustment may be combined with one of the above possibilities of readjustment.
  • side stretchers 28 and 29 after the pairs of rollers 7a, 7a' and 7b and 7b' as seen in the direction of transport.
  • These stretchers consist of two small plates, one placed at a small distance above the other, between which the side edges of the web are passed.
  • the upper or the lower plates are provided with little holes, oriented laterally as well as forward, through which compressed air or another medium is supplied in order to stretch the side edges of the web.
  • the devive for effecting the method according to the invention consists of, for instance, a feed reel 1 on which unstretched sheeting has been wound, possibly guide rollers 2 and 4, a tensioning roller 3 which is coupled to the potentiometer 14 that operates the brake 15 on the reel 1, pairs of clamping rollers 5 and 6 with axes of rotation 5' and 6', mounted on either side of the web, controlling mechanism 16 through 27 for the pairs of clamping rollers 5 and 6 and the pairs rollers 7a, 7a' and 7b, 7b' with photocells 30 and 31, side stretchers 28 and 29, a device 3 with guide chains for the stretched web for stabilization of this web at the desired width, guide rollers 9,9' for the stabilized web, and finally a winding reel 11 and a pressure roller 12 for the stabilized web of reticulate material, and a guide 13 for the pressure roller 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Vehicle Body Suspensions (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
EP79200532A 1978-09-23 1979-09-22 Verfahren und Vorrichtung zum Strecken von netzartigen Materialbahnen Ceased EP0009294A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7809679 1978-09-23
NL7809679 1978-09-23

Publications (1)

Publication Number Publication Date
EP0009294A1 true EP0009294A1 (de) 1980-04-02

Family

ID=19831600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200532A Ceased EP0009294A1 (de) 1978-09-23 1979-09-22 Verfahren und Vorrichtung zum Strecken von netzartigen Materialbahnen

Country Status (8)

Country Link
EP (1) EP0009294A1 (de)
JP (1) JPS5544900A (de)
AU (1) AU5112579A (de)
CA (1) CA1140312A (de)
DK (1) DK395479A (de)
ES (2) ES484354A1 (de)
FI (1) FI792949A (de)
NO (1) NO793044L (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0312043A1 (de) * 1987-03-12 1989-04-19 Erhardt & Leimer GmbH Vorrichtung zum Ausbreiten und Führen einer Warenbahn
US5791030A (en) * 1996-08-26 1998-08-11 Nippon Petrochemicals Co., Ltd. Web widening apparatus
WO2001012418A1 (de) * 1999-08-16 2001-02-22 Trespaphan Gmbh Verfahren und vorrichtung zum führen einer materialbahn

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5960341A (ja) * 1982-09-30 1984-04-06 Rikagaku Kenkyusho レ−ザ−回折像を用いる粒度分布測定法
CN113070973A (zh) * 2021-04-23 2021-07-06 豪伟实业(湖北)有限公司 一种封边带压紧机构
CN116533552B (zh) * 2023-06-12 2024-04-02 青岛金福鑫塑料机械有限公司 一种pet打包带生产成形装置及生产方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1424541A (fr) * 1964-12-03 1966-01-14 Kodak Pathe Nouveau procédé d'étirage transversal de pellicules et machine pour sa mise en oeuvre
FR1577739A (de) * 1968-08-22 1969-08-08
FR2090131A1 (de) * 1970-05-19 1972-01-14 Hoechst Ag
US3838481A (en) * 1971-07-21 1974-10-01 M Kuroda Apparatus for laterally stretching textile fabric and the like
US4140574A (en) * 1978-03-24 1979-02-20 Beloit Corporation Web spreader and guide

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1424541A (fr) * 1964-12-03 1966-01-14 Kodak Pathe Nouveau procédé d'étirage transversal de pellicules et machine pour sa mise en oeuvre
FR1577739A (de) * 1968-08-22 1969-08-08
FR2090131A1 (de) * 1970-05-19 1972-01-14 Hoechst Ag
US3838481A (en) * 1971-07-21 1974-10-01 M Kuroda Apparatus for laterally stretching textile fabric and the like
US4140574A (en) * 1978-03-24 1979-02-20 Beloit Corporation Web spreader and guide

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0312043A1 (de) * 1987-03-12 1989-04-19 Erhardt & Leimer GmbH Vorrichtung zum Ausbreiten und Führen einer Warenbahn
US5791030A (en) * 1996-08-26 1998-08-11 Nippon Petrochemicals Co., Ltd. Web widening apparatus
WO2001012418A1 (de) * 1999-08-16 2001-02-22 Trespaphan Gmbh Verfahren und vorrichtung zum führen einer materialbahn
US6704978B1 (en) 1999-08-16 2004-03-16 Trespaphan Gmbh Method and device for guiding a web of material
AU771910B2 (en) * 1999-08-16 2004-04-08 Trespaphan Gmbh Method and device for guiding a web of material

Also Published As

Publication number Publication date
ES484355A1 (es) 1980-05-16
AU5112579A (en) 1980-04-03
NO793044L (no) 1980-03-25
DK395479A (da) 1980-03-24
CA1140312A (en) 1983-02-01
FI792949A (fi) 1980-03-24
ES484354A1 (es) 1980-05-16
JPS5544900A (en) 1980-03-29

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19830603

RIN1 Information on inventor provided before grant (corrected)

Inventor name: JANSEN, JOHANN JOSEF