US2755533A - Apparatus for stretching webs - Google Patents

Apparatus for stretching webs Download PDF

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Publication number
US2755533A
US2755533A US278252A US27825252A US2755533A US 2755533 A US2755533 A US 2755533A US 278252 A US278252 A US 278252A US 27825252 A US27825252 A US 27825252A US 2755533 A US2755533 A US 2755533A
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United States
Prior art keywords
links
chain
link
pins
web
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 - Lifetime
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US278252A
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English (en)
Inventor
Donald F Miller
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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Filing date
Publication date
Priority to BE553635D priority Critical patent/BE553635A/xx
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US278252A priority patent/US2755533A/en
Priority to GB5812/53A priority patent/GB744768A/en
Application granted granted Critical
Publication of US2755533A publication Critical patent/US2755533A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/16—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial simultaneously
    • B29C55/165—Apparatus therefor
    • 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
    • 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
    • D06C2700/00—Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
    • D06C2700/04—Tenters or driers for fabrics without diagonal displacement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/73—Processes of stretching

Definitions

  • This invention relates to an apparatus for stretching webs and more particularly webs of sheet materials. Still more particularly it relates to an apparatus for simultaneously stretching webs in a lateral and longitudinal direction.
  • An object of this invention is to provide an improved apparatus for stretching webs.
  • a further object is to produce such apparatus which is simple in construction and effective in operation.
  • a still further object is to provide such apparatus wherein the degree of lateral and longitudinal stretching can be regulated in a simple manner. Still other objects will be apparent from the following specification.
  • Fig. 1 is a top plan view of a stretching apparatus embodying the invention
  • Fig. 2 is a perspective view in a larger scale of a portion of the adjustable stretching unit showing the cam track, chain links and a gripper,
  • Fig. 3 is a section taken along the line 3-3 of Fig. 1 showing the chain links, gripper and web,
  • Fig. 4 is a perspective view of a link structure
  • Fig. 5 is a perspective view of an alternative link structure
  • Fig. 6 is a plan view of a chain with four links in stackedrelationship
  • Fig. 7 is a section of the upper part of a chain with four links in stacked relationship
  • Fig. 8 is an elevation of part of a chain with three links in stacked relationship
  • Fig. 9 is a plan view of a chain link with a curved slot in closed position
  • Fig. 10 is a plan view of a chain link with a curved slot in an extended position
  • Fig. 11 is a schematic view of two links with the cam surface opposite from the direction of travel
  • Fig. 12 is a schematic view of two links with the cam surface in the same direction of travel
  • Fig. 13 is a plan view of a series of grippers mounted on chain pins
  • Fig. 14 is a sectional view taken along the line BB of Fig. 13.
  • bedplates 1 and 2 are pivotally mounted on a suitable frame 3 shown in dotted outline by means of pivot pin 4 which interfits with a hole 5 on the lateral lug extension 6 of bedplate 2.
  • the pin is fixed to lug extension 7 on bedplate 1.
  • the bedplates rest on the frame member and their position with respect to each other and axis A-A can be regulated by means of lead screw 8 that is journaled in bearing 9 which is pivotally mounted on plate 2 as schematically shown in Fig. 1 with the pivot 9' in dotted outline, said bearing being threadably engaged with the upstanding lug 10 which is similarly pivotally mounted on bedplate 1 with the pivot 10 being shown in dotted outline.
  • Screw 8 is fastened suitably at its journaled end so that it will turn freely but cannot move along its axis.
  • the other end of the screw is provided with a handle 11 so that it can be turned.
  • the bedplates are drawn closer together and when turned in the opposite direction spread farther apart. This adjustment determines the degree of lateral stretchinggiven to web W (e. g., a transparent non-oriented polymer).
  • variable pitch stretcher chains 12 are identical in construction but travel in opposite directions.
  • the stretcher chains consist of a series of identical links.
  • Each link consists of a flat L-shaped link body member 14 which is provided with a pivot hole 15, which, as shown in Figs. 2 and 4 consists of a round hole. Spaced from this hole is an elongated slot 16 that can be straight or curved.
  • the curved tip 17 which constitutes an extension of the cam surface side of the L-shaped link body, coacts with a cam track and this is explained further below.
  • the end of the slot nearest the pivot hole preferably is formed in a half-round.
  • the chains are not shown as a complete unit in any view, for the sake of clarity. However, the pivot pins, which as shown are fitted into the pivot holes by a close fit, indicate the positions the respective chains take when in assembled relationship.
  • the chains can be operated in either direction depending upon whether a stretching or controlled shrinking operation is being carried out, as described below.
  • the axis of the slot is at an angle greater than from said longitudinal axis. This angle determines the force F tending to rotate the link around its axis.
  • the pitch of the chain and the degree of longitudinal stretching can be varied in the case of the specific shape of link of Fig. 4 from x to nx.
  • pivot hole 15 is in the outer, upper part of the toe and the slot 16 extends along the base of the L-shaped link.
  • the side and top of this link form a contacting surface to engage with a cam track which regulates the rate and extent of their pivoting and the consequent distance between the centers of the adjacent pins. This, in turn, regulates the rate and extent of longitudinal stretching of the web.
  • a variable pitch chain 12 which is illustrated in Fig. 1 with only two overlapping links being shown in three spaced positions, in order to avoid confusion, is made by joining two sets of alternate pairs of links by means of pins 18 which pass through the pivot hole 15 of one link and the elongated slot 16 of the next link in the chain. These links are stacked alternately above and below each other as shown in Figs. 1 and 2 and when all links are present form a closed chain. Two sets of links are shown in these figures and they are spaced a short distance apart by intervening guide members. Thus, as shown in Fig. 2 they are separated by guide plate 35. The round surfaces of pins 18 between the two sets mesh with a driving sprocket 19 and idler sprocket 20.
  • the round surfaces of pins 18 between the two sets mesh with a driving sprocket 19 and idler sprocket 20.
  • teeth on the driving sprocket are spaced to have a pitch equal to distance nx so that it will mesh with the pins when the links are at their maximum extended position.
  • the teeth on the idler sprocket are so spaced that the pitch is equal to distance x. This means that the links 3 are at closed position as they enter stretching units 13.
  • the path of pins 18 between idler sprocket 20 and the guide roller 21 is essentially a straight line.
  • the closed chain 12 passes around driving sprocket 19 which is spaced above and to one side of guide roller 21 and returns to idler sprocket 20 forming a triangular shaped path.
  • the sprockets and roller may be journaled on stub shafts suitably mounted on the bedplates.
  • the links in the chain on bedplate 1 are reversed with respect to those on bedplate 2.
  • each pin or alternate pins or regularly spaced pins is extended as shown in Figs. 2 and 3 through and fixed to an L-shaped bracket 22 which has a gripper arm 23 pivoted in a slot 24 in one arm of the bracket.
  • the other arm of the L-shaped bracket is forked and has an open-ended slot 26 which engages with adjacent chain pin 18.
  • the pivot pin may be fixed to the bracket on opposite sides of the gripper arm or fixed to the gripper arm and journaled in the bracket on each side of the slot.
  • the chain pin also extends through a gripper base plate 27 which extends below the projection of the bracket and under the gripper arm. This plate serves as a rest for the selvage of web W.
  • Fig. 2 Only one gripper is shown in Fig. 2 for the sake of clarity. They may be disposed on each pin 18 as shown in Figs. 13 and 14.
  • Bedplates 1 and 2 are provided with guide rails 29. They may be cast integrally with the bedplates or may be welded, bolted or otherwise afiixed to the latter.
  • the inside surface of the rails is substantially parallel to the locus of the pins as they pass from the idler sprocket to the driving spocket.
  • Second guiding rails 30 are also mounted on the bedplates. They are pivoted at their respective lower end on pivot pin 31.
  • the opposite ends of the guide rails have the end of a screw 32 attached thereto. Each screw is threada-bly engaged with an upstanding lug 33 on the respective bedplate.
  • the outer end of the screws are provided with turning handle 34.
  • the guide rail 39 is in the form of a U-s'haped channel.
  • a central plate 35 extends from each channel, its upper and lower surfaces act as bearing surfaces for the Itlat portion of the inner links.
  • the outer edge of each central plate is disposed parallel with the inner edge of guide rail 2? when in innermost position and the distance between these edges when in such position is slightly greater than the diameter of pins 18.
  • the inner edge of the U-shaped channel slants with respect to the edges of the guide rails and forms a slanting cam track 36 which engages with the edge and end of each L-shaped link.
  • the degree of slant of :the U- shaped guide rail can *be regulated so that the amountof longitudinal stretch of the web can be varied from x to ms. In general, the degree is adjusted'sothat the distance does not increase to the full amount nx.
  • Tripper arms 37 are placed in the path of the gripper arms at or near the end of guide rails '29 to disengage-the grippers.
  • a part of the trippe-r arm is also shown in Fig. 2 and this part forms a cam surface which lifts each gripper arm and removes it from contact with the web as the chain moves past the gripper release station.
  • Link-rcaligning unit 3 8 is placed in the path of the pins between the driving and driven sprockets and preferably near the latter in order to assist in bringing the links into alignment before they pass into the stretching unit or zone.
  • These units may have a construction similar to units 13 and be composed of a channel member 4% and rails 39 and 41 and similar to members 29, 30 and 35 so that they not only realign the links but tighten the chain.
  • the rails 39 can be afiixed to the respective bcdplates in any suitable manner, a. g., by welding, screws, bolts, etc, and rails 41 can be made adjustable like members 23 by means of lead screws, etc.
  • members 39 and 40 of unit 38 and minimum pitch sprocket 20 While a space has been shown between the end of members 39 and 40 of unit 38 and minimum pitch sprocket 20 for the sake of clarity, in actual construction members 39 and 40 can be extended so as to form a guiding surface right up to the point where the link pins contact with the sprocket teeth. Similarly, members 29 and 30 of unit 13 can be extended to the point where the link pins contact with the sprocket teeth 19. Thus the upper portions of the guide members may overlap the fiat surfaces of the sprockets.
  • a curved cam 42 is provided about each sprocket to open the grippers and allow them to close and grip the web W as it passes into the path of the grippers.
  • the links 18 are stacked pairs thus providing a relatively smooth surface to engage with the horizontal surfaces of the track in the stretching unit.
  • the contour of the links can he modified so that they can be stacked in units of 3 or 4 or even more. Further, it is not necessary that each pin be connected to the adjacent links through the pivot hole of one and the elongated slot of the next link.
  • a four-link stacking arrangement is shown where alternate pairs are spaced. Theyv are shown in solid elevation for clarity.
  • Fig. 8 illlustrates a three-link stacking arrangement in section and is self-explanatory.
  • Figs, 9, 10, 11, and 12 require no extended description since their function is clear from the above. It will be noted, however, that the angle 0 remains :the same regardless of the amount the link has rotated and the chain thereby extended. The force tending to rotate the link therefore will remain constant. In the link shown in Fig. 5 the angle 6 increases with the rotation of the link as does the rotating force.
  • Figs. 11 and 12 merely illustrate that the chain links can be reversed and still function the same when the chain travels in the same direction. As stated above the chain may travel in either direction.
  • Figs. 13 and 14 there is illustrated a series of grippers mounted on successive pins 18.
  • the plates of these grippers have been eliminated for the sake of clarity.
  • the chain links have not been shown for a similar reason.
  • the assembly on a pin is shown in Figs. 2 and 3.
  • pivoted arms 23 which have a rounded bottom there may be substituted pivoted arms with an elongated flat plate which is provided with pins to pierce the web to be stretched.
  • This type of gripper is illustrated in U. S. Patent 650,385 to Gadd.
  • sprocket of minimum pitch has been described as a driven sprocket it maybe connected by .a suitable chain or series of gears to the same source of power that turns the driving sprocket of maximum pitch.
  • the contour of the links can vary considerably so long as there is a pivot point and .a slot which allow the pins to separate.
  • the pivot hole and adjacent end of the slanting slot are near the heel of the L-shaped link and the pivot hole is nearest the base.
  • the links need not be L-shaped but may be oval, e.tc. preferably with cut-away portions if necessary so that the may close to minimum pitchand expand to maximum .pitch without interference with the pins.
  • Various heating and cooling devices e. ;g,., 13 195, Coils, jackets, etc, can be provided along the web travel to control the operations.
  • the grippers can be heated or cooled.
  • Various other types of grippers can be substituted for those shown and described above.
  • non-oriented superpolymer film e. g., polyethylene terephthalate films of the type described in Whinfield et al., U. S. Patent 2,465,319.
  • Patent 2,570,478 is fed directly from an extrusion device or from a supply roll (none being shown) into the stretching apparatus.
  • the lower surfaces of the respective edges of the web are directed onto gripper base plates 27 and gripper arms fall by gravity into contact with the upper surface of the web.
  • tension is gradually applied laterally and longitudinally because of the divergency of the bedplates and because the links are actuated and pivot so that the pitch (i. e., distance between successive pins 18) increases from minimum to a greater pitch determined by the amount of stretching it is desired to effect in tthe web.
  • the grippers are released after the maximum desired stretch has been accomplished.
  • the web then passes on for any desired further treatment.
  • gripper arms may be actuated by a cam surface or tripping device similar to that described above for releasing the gripper arms but in reverse direction.
  • the invention is not limited to the stretching of polyethylene terephthalate film but may be used in stretching webs of many diverse types including not only resins and superpolymers, e. g., nylon, polyethylene, polyvinyl chloride, poly(vinyl chloride co vinyl acetate); cellulose derivatives, e.
  • the apparatus is not limited to stretching so that a permanent set is obtained as it may be used to make elastic fabrics by suitable techniques along the selvage, etc., during travel of the web. It is useful for controlled shrinking of fabrics in which case it would be operated in reverse.
  • the apparatus is primarily designed for stretching in two directions, it is not limited to that treatment.
  • longitudinal stretching only can be accomplished.
  • a web-stretching apparatus comprising a pair of bedplates which are capable of being separated in essentially the same plane from a common perpendicular axis, a sprocket of minimum chain pitch, a guide roller and a sprocket of maximum chain pitch, each revolubly mounted on one only of each bedplate to form a circuitous path for a chain capable of extending and contracting between maximum and minimum pitch, each chain being composed of regularly spaced pins which mesh with said sprockets and extend through two separated rows of links, each link having a pivot hole and an elongated slot extending through from the top to the bottom surfaces of its flat body, the locus of the center of the slot being offset from the pivot hole, each link being joined in chain fashion so that adjacent pins pass through the pivot hole of one link and elongated slot of another, adjustable guide rails on each bedplate between the guide roller and sprocket of minimum chain pitch to form a path for the chain pins and links, one of said rails being
  • a web stretching apparatus comprising a pair of flat bedplates which are capable of being separated in essentially the same plane from a common perpendicularaxis, a driven sprocket of minimum chain pitch, a guide roller and a driving sprocket of maximum chain pitch, each revolubly mounted on one only of each bedplate to form a circuitous path for a chain capable of extending and contracting between maximum and minimum pitch, each chain being composed of regularly spaced pins which mesh with said sprockets and extend through two separated rows of links, each link having a pivot hole and an elongated slot extending through from the top to the bottom surfaces of its flat body, the central axis of the slot being offset from the pivot hole and its ends being of unequal distance from the pivot hole, each link being joined in chain fashion so that adjacent pins pass through the pivot hole of one link and elongated slot of another, adjustable guide rails on each bedplate between the guide roller and driven sprocket to form a path for the chain pins and links, one of
  • a web-stretching apparatus comprising a pair of bedplates which are pivoted near one end and capable of lateral separation in essentially the same plane from a common perpendicular axis at the other end, a driven sprocket of minimum chain pitch located near the pivoted end of the bedplate and spaced laterally from said axis, a guide roller spaced longitudinally from said sprocket and laterally from said axis and a driving sprocket of maximum chain pitch spaced a greater lateral distance from said axis on each bedplate to form a triangular path for a chain capable of extending and contracting between maximum and minimum pitch, each chain being composed of regularly spaced pins which mesh with said sprockets and extend through two separated rows of extensible links, each link having a pivot hole and an elongated slot extending through from the top to the bottom surfaces of its flat body, the central axis of the slot being offset from the pivot hole and its ends being of unequal distance from the pivot hole, each link being joined
  • a web-stretching apparatus comprising a pair of flat bedplates which are pivoted on a common perpendicular axis near one end and are capable of lateral separation in essentially the same plane from a common axis at the other end, means for adjusting the lateral separation of said hedplates, a driven sprocket of minirnumchain pitch located near the pivoted end of the bedplate and spaced laterally from said axis, a guide roller spaced longitudinally from said sprocket and laterally from said axis and a driving sprocket of maximum chain pitch spaced a greater lateral distance from said axis on each bedplate to form a triangular path for a chain capable of extending and contracting between maximum and minimum pitch, each chain being composed of regularly spaced pins which mesh with said sprockets and extend through two separated rows of links, each link having a pivot hole and a curved elongated slot extending through from the top to the hottom surfaces of its flat body, the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Advancing Webs (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
US278252A 1952-03-24 1952-03-24 Apparatus for stretching webs Expired - Lifetime US2755533A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE553635D BE553635A (en(2012)) 1952-03-24
US278252A US2755533A (en) 1952-03-24 1952-03-24 Apparatus for stretching webs
GB5812/53A GB744768A (en) 1952-03-24 1953-03-02 Apparatus for stretching webs

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US278252A US2755533A (en) 1952-03-24 1952-03-24 Apparatus for stretching webs

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US2755533A true US2755533A (en) 1956-07-24

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923966A (en) * 1960-02-09 Continuous biaxial stretching device
US2930173A (en) * 1957-06-14 1960-03-29 Package Machinery Co Machine for wrapping an assembly of cylindrical articles
US2988772A (en) * 1958-05-26 1961-06-20 Celanese Corp Film stretching
US3055048A (en) * 1959-11-12 1962-09-25 American Viscose Corp Simultaneous blaxial stretching of film with a tenter frame
US3078504A (en) * 1960-03-16 1963-02-26 American Viscose Corp Method and apparatus for biaxial stretching of beaded edge film
US3148409A (en) * 1961-03-21 1964-09-15 Trockentechnik Kurt Bruckner K Material treating machine
US3150433A (en) * 1959-07-25 1964-09-29 Kampf Eberhard Stretching machine
US3195177A (en) * 1961-08-06 1965-07-20 Shin Mitsubishi Jukogyo Kk Apparatus for stretching thermoplastic film
US3248753A (en) * 1960-09-05 1966-05-03 Asahi Chemical Ind Apparatus for simultaneously biaxially stretching thermoplastic film
US3256558A (en) * 1963-08-21 1966-06-21 Hoechst Ag Apparatus for continuously drawing sheetings simultaneously in a longitudinal and a transverse direction
FR2574056A1 (fr) * 1984-12-01 1986-06-06 Dornier Gmbh Lindauer Circuit de chaines a pinces etireuses montees sur galets pour machine a etirer une matiere en bandes
US4890365A (en) * 1987-05-18 1990-01-02 Lindauer Dornier Gesellschaft Mbh Apparatus for heating film webs simultaneously in two axial directions
FR2654383A1 (fr) * 1989-11-14 1991-05-17 Dornier Gmbh Lindauer Chaine a pinces a pas progressivement variable pour traitement simultane de feuilles minces en bande dans les sens transersal et longitudinal.
FR2654384A1 (fr) * 1989-11-15 1991-05-17 Dornier Gmbh Lindauer Chaine a pinces, a pas progressivement variable, pour traitement biaxial simultane de bandes minces.
CN111086196A (zh) * 2020-03-19 2020-05-01 佛山市盟思拉伸机械有限公司 薄膜双向同步拉伸装置及其控制方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410907A (en) * 1944-09-29 1946-11-12 Stowell Lyman Charles Tenter chain link
US2577880A (en) * 1948-08-04 1951-12-11 Celanese Corp Apparatus for tentering

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410907A (en) * 1944-09-29 1946-11-12 Stowell Lyman Charles Tenter chain link
US2577880A (en) * 1948-08-04 1951-12-11 Celanese Corp Apparatus for tentering

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923966A (en) * 1960-02-09 Continuous biaxial stretching device
US2930173A (en) * 1957-06-14 1960-03-29 Package Machinery Co Machine for wrapping an assembly of cylindrical articles
US2988772A (en) * 1958-05-26 1961-06-20 Celanese Corp Film stretching
US3150433A (en) * 1959-07-25 1964-09-29 Kampf Eberhard Stretching machine
US3055048A (en) * 1959-11-12 1962-09-25 American Viscose Corp Simultaneous blaxial stretching of film with a tenter frame
US3078504A (en) * 1960-03-16 1963-02-26 American Viscose Corp Method and apparatus for biaxial stretching of beaded edge film
US3248753A (en) * 1960-09-05 1966-05-03 Asahi Chemical Ind Apparatus for simultaneously biaxially stretching thermoplastic film
US3148409A (en) * 1961-03-21 1964-09-15 Trockentechnik Kurt Bruckner K Material treating machine
US3195177A (en) * 1961-08-06 1965-07-20 Shin Mitsubishi Jukogyo Kk Apparatus for stretching thermoplastic film
US3256558A (en) * 1963-08-21 1966-06-21 Hoechst Ag Apparatus for continuously drawing sheetings simultaneously in a longitudinal and a transverse direction
FR2574056A1 (fr) * 1984-12-01 1986-06-06 Dornier Gmbh Lindauer Circuit de chaines a pinces etireuses montees sur galets pour machine a etirer une matiere en bandes
US4639984A (en) * 1984-12-01 1987-02-03 Lindauer Dornier Gesellschaft Mbh Guide track for a tentering chain
US4890365A (en) * 1987-05-18 1990-01-02 Lindauer Dornier Gesellschaft Mbh Apparatus for heating film webs simultaneously in two axial directions
EP0291775A3 (en) * 1987-05-18 1990-07-25 Lindauer Dornier Gmbh Apparatus for the simultaneous biaxial treatment of films
FR2654383A1 (fr) * 1989-11-14 1991-05-17 Dornier Gmbh Lindauer Chaine a pinces a pas progressivement variable pour traitement simultane de feuilles minces en bande dans les sens transersal et longitudinal.
FR2654384A1 (fr) * 1989-11-15 1991-05-17 Dornier Gmbh Lindauer Chaine a pinces, a pas progressivement variable, pour traitement biaxial simultane de bandes minces.
US5161674A (en) * 1989-11-15 1992-11-10 Lindauer Dornier Gesellschaft Mbh Tentering chain with a continuously adjustable chain pitch for treating film webs simultaneously in two axial directions
CN111086196A (zh) * 2020-03-19 2020-05-01 佛山市盟思拉伸机械有限公司 薄膜双向同步拉伸装置及其控制方法

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GB744768A (en) 1956-02-15
BE553635A (en(2012))

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