Classifications

• • 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
• • 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
  • B29C55/20—Edge clamps

Definitions

• the invention relates to a clip-transport unit according to the preamble of claim 1.
• stretching systems find particular in the plastic film production application.
• simultaneous stretching machines in which a plastic film can be stretched simultaneously in the transverse and longitudinal directions.
• sequential stretching machines in which a plastic film is stretched in two successive stages, for example first in the longitudinal direction and then in the transverse direction (or vice versa).
• a previously known transverse stretching or transverse stretching stage within a stretching installation has become known, for example, from US Pat. No. 5,797,172.
• a material web to be stretched as a rule a plastic film, is grasped by means of clips which are fastened to chains and which can be moved on circumferential guideways on both sides of the material web to be stretched are arranged.
• the clips are successively from an inlet zone (in which the edge is detected, for example, a plastic film to be stretched) via a stretching zone (in which the opposite clips on the guide rail sections with a transverse component divergent to the transport direction are moved away from each other) to an outlet zone and then on a Return way back to the inlet zone process, the film in the outlet zone, for example, a final relaxation and / or post-heat treatment can be subjected.
• the clips consist of a so-called clip-transport unit, which on the one hand the actual clip part and on the other hand, the so-called transport part, ie the clip device and the transport device comprises.
• the so-called transport part is ultimately a chain part, since the clips for the illustrated transverse stretching device are connected to one another via corresponding chain links.
• the clip transport unit is supported via sliding elements on two opposite sides of a guide rail on the one hand and on a mounting rail provided below the guide rail on the other hand in addition to the other.
• roller elements in order to be able to move the clip transport unit, for example, supported on a guide rail and a weight rail.
• a guide rail in the form of a so-called monorail is described, which has a rectangular cross-section.
• the clip transport unit is supported on wheels running on the upper side as well as on the underside and on the two vertical sides offset in the horizontal direction, so-called rollers, by means of which the clip transport unit can be moved along this guide rail.
• Such a clip transport unit is also particularly suitable for a stretching frame, ie a transverse stretching system.
• devices for stretching a moving web of material have become known, which can be used in the context of a simultaneous stretching system.
• a stretching machine can be seen as known for example from DE 37 41 582 AI.
• the clip transport units are supported by rollers rotating on horizontal and vertical axes on the upper and lower sides as well as the two vertical sides of a vertical guide and weight-receiving rail which is rectangular in cross-section.
• there is a further control rail, about which chain scissor links the distance of the clips to each other in the region of the divergent Simultanreckzonen in the machine direction MD can be set differently.
• the guide rail also serves as a support rail for the clip transport units.
• the drive of the clips follows in this case not by a chain, but via linear motors along the circulation path, which consists of stationary primary parts and with the clip movable secondary parts. Both the primary and secondary parts may be mounted at one or more positions with respect to the guide rail, ie above or below or laterally of the guide rail.
• sliding and / or rolling elements can also be used again to keep the clip transport units on the guide and support rail longitudinally displaceable.
• the corresponding clip transport units to a minimum (based on the volume or relative to the total weight of the transport unit) of light materials, ie in particular composite materials.
• Composites or so-called composite materials are materials composed of two or more materials.
• the composite material has other and generally improved properties than the material properties of its individual components.
• not only a very light transport unit can be produced within the scope of the invention, but a Light transport unit, which also withstands high forces and loads.
• the properties of composite or composite materials are known to depend on various effects.
• the connection of the individual starting materials is carried out by a material and / or positive connection of the components involved.
• the fiber composite materials have a particularly preferred meaning, wherein these materials may for example also be provided in a matrix of aluminum, magnesium or other composite materials.
• weight reduction is also that less weight must be dragged through the chain, i. There is a reduction of the drive power.
• the weight reduction also causes a reduction in KettenlCodeskräf te, since the drag forces, the preload and the centrifugal trains are low.
• the chain pins can be designed optimized or it can be reduced in size, which in turn to another Weight reduction contributes.
• both the tenter part and the chain part ie, generally the transport part
• both the tenter part and the chain part can be wholly or partly made of lightweight materials.
• plain bearing guided chain chain systems which will be described here by way of example.
• Figure la a schematic plan view of a
• Figure lb a modified to Figure la embodiment of a process side separate return be te for the
• Figure 2 is a schematic cross-sectional view through a support structure for the guideway of a transport chain with associated clips;
• Figure 3 a clip with parts of the transport chain in an abstract spatial representation
• FIG. 4a shows a side view of a clip according to the invention parallel to the advance movement of the clip (to uniquely identify the directions, a coordinate system has been drawn, where m is the transport direction along the guide rail, t is the direction of the normal vector and z is the direction collinear with the guide rail);
• Figure 4b a corresponding plan view of the
• Figure 4c a vertical cross-sectional view through the transport chain and explanation of the structure of the transport chain
• FIG. 4d shows a schematic top view of a Ke11eng1iedausbi1dung
• Figure 4e a schematic plan view of a
• Clip transport unit for showing how the clip part is bolted to the transport part
• FIG. 5 shows a schematic vertical side view perpendicular to a monorail as guide and support rail with respect to a linear motor-driven clip formation
• FIG. 5a a corresponding illustration to FIG. 5 for explaining the attachment of the
• FIG. 5b a further illustration of FIG
• FIG. 6 shows a schematic side view of FIG
• FIGS. 4a to 4e with the forces and working planes applied thereto, in which these forces occur and act;
• FIG. 7 shows a representation corresponding to FIG. 5 for the case of a linear motor-driven chain transport unit
• Figure 8 a chain longitudinal force position diagram showing the at the clips attaching forces.
• a transport system of a stretching system usually consists of a weight guide rail and a guide rail, but can also be combined in a rail unit.
• Pentagraphsystemen two rail units are usually present, the first rail system fulfills a function of leadership and weight and the second the control of the clip movement. All these details are familiar to the expert and need not be further explained here.
• a Breitrecktechnik first described with a plain bearing, so a Querreckstrom.
• the sheet wide or transverse stretching unit described here which is also referred to below as TD stretching unit (TD), has two symmetrically designed drive systems which are symmetrical to a central symmetry running vertically to the drawing plane Level SE lie.
• FIG. 1a the two drive systems arranged symmetrically with respect to the symmetry plane SE in the withdrawal direction 1 are shown, wherein the material web to be treated, ie to be stretched, is moved along the withdrawal direction 1 between the two drive systems revolving on closed webs 2, in particular in the form of a plastic film F .
• the illustrated TD stretching unit can also be part of a sequential stretching unit, the usually one of the transverse stretching (transverse stretching) upstream longitudinal stretching stage comprises (in case of doubt, this longitudinal stretching stage of the transverse stretching stage but also be arranged downstream).
• the stretching apparatus shown in FIG. 1 a comprises two chain transport systems 3 driven in the direction of rotation on the two circulating webs 2.
• a uniaxial (ie if a longitudinal stretching of the shown Querreckstrom is upstream) or an unstretched film F (which is referred to in the following film, although with such a stretching generally a treatment sheet F can be treated accordingly and transversely, so that the invention so far is not limited to a plastic film) runs in the inlet area E in the stretching and is there from below discussed cleats, as shown for example with reference to Figure 2, taken at both edges 8 and pinched, on the so-called operator Side (OS - operator side) and the drive-side drive side (DS - drive side).
• the film F is then heated in a subsequent preheating zone PH, and subsequently fed to a stretching zone R in order to be drawn here in the transverse direction TD.
• the stretched film F passes through different heat treatment zones HT, in which a relaxation of the film can take place.
• the film is unclipped by suitable means and then leaves the transverse stretching machine, ie the transverse stretching unit TD.
• Kluppen- rsportechen KT which are hereinafter also partially referred to as Kluppen- chain units KK.
• These Clip transport unit KT or clip chain unit KK comprises on the one hand the so-called clip part 6 which is connected to the chain or transport part 7 down here bridge B, the bridge B is hereinafter also partially referred to as clip bridge B.
• the clip bridge B (the volume and weight is only a small proportion in relation to the clip part 6 and the transport or chain part 7), for example, also be added to the clip part 6.
• a chain part 7 which is part of the tenter chain unit KK.
• it is preferable to speak of a transport part 7 since no transport chain is provided here), which forms the so-called clip transport unit KT together with the clip part 6.
• these tenter chain units KK that is to say the mentioned tenter part 6 and the chain part 7, are located in a circulating transport system 3, which firstly comprises a support structure, ie a support structure 11 and a circumferential chain 13, on which the mentioned tenter parts 6 are attached or trained mit noteworthyd.
• the support structure 11 comprises a guide rail 15.
• a support rail 17 receiving the weight of the chain and the clips is also provided, which is also referred to below as a weight guide rail 17.
• the leadership and support of the transport chain with the it with movable clips on the mono-guide rail 15 and on the support rail 17 by means of a sliding bearing.
• the illustrated support structure can be used as a common support structure for the transport system both on the stretch side process side RS and on the return side RL ( Figure 2).
• Figure 2 is a cross section through the transport system to see, namely with a common support structure 11, in addition to a arranged in the middle, more vertically extending support 19, a cross member supported above 21, at its opposite ends facing away from each of the upwardly extending, in cross-section rectangular rail 15, so the so-called guide rail 15 is mounted, namely as mentioned on the stretching side RS on the one hand and on the back RL to the other.
• the transport system is common within a furnace O ( Figure la).
• This furnace surrounds both the preheating zone PH, the stretching zone R and the reheating zone or relaxation zone HT, so that ultimately only the deflecting and driving systems provided on the inlet and outlet sides come to lie outside the furnace O.
• a separate support structure for the stretch side RS as the return side RL may be provided, so that in this case only the rear-side support structure with the associated guide rail and the weight rail passes through the oven O and a correspondingly formed further support structure on the return side outside the furnace O is provided.
• An appropriate structure in schematic plan view is shown in Figure lb.
• the transport chain 13 is driven and deflected both on the outlet and the inlet side by outlet and / or inlet wheels AR and ER.
• Weight reduction through lightweight materials reduces the power dissipation caused by friction and reduces drive power as less mass has to be moved. As positive secondary effects, the lubricating amounts can be reduced and the cooling capacity can be reduced.
• a lintel transfer unit made of cast steel which forms the transport system with a guide rail and support rail construction (and control rail in the case of pentagraph systems).
• This standard system has fixed functional dimensions, e.g. the chain pitch, the Einkluppaboom, the MD stretching ratio, the location of the film plane with respect to plain bearings or roller bearings, etc.
• the clip transport unit KT for example, has a meter weight, which is at least 25% lighter than a corresponding (identical) cast steel execution of the clip transport unit KT.
• the meter weight in an embodiment of the invention Kluppen- transport in identical design ie with the same shape, dimension, etc.
• a corresponding embodiment in a cast steel execution lead to a weight saving of at least 25%, alone in that, for example, composites are used in the context of the invention.
• a composite material with two or more materials may be used, preferably with fiber composites embedded in a matrix.
• a volume and / or weight saving should be realized that at least 25%, in particular at least 30%, 40%, 50%, 60%, 70%, or even at least 80% or in extreme cases 90% compared to a structurally identical or identical construction Cast steel version is. Therefore, within the scope of the invention it is also assumed that at least 25% and preferably more than 30%, 40%, 50%, 60%; 70%, 80% or even more than 90% of the weight fraction of the clip transport unit KT consists of materials comprising or comprising one or more materials from the group of aluminum, magnesium or fiber composites.
• this volume or weight fraction of a clip transport unit according to the invention should be at least 25%, in particular at least 30%, 40%, 50%, 60%, 70%, 80% or in extreme cases at least more than 90%.
• weight reduction is that less weight has to be dragged through the chain, the linear motors or the scissor lattice, i. There is a reduction of the drive power.
• An improvement in the overall situation i. A reduction of the coefficients of friction, an associated improvement with respect to the sliding bearing and a possible lubrication and / or a reduction of the abrasion can be realized by the fact that the transport chain 13 as a whole with the tenter chain units KK (ie generally for the tenter transport units KT ) and the fastener parts 6 and the transport or chain parts 7 or at least parts thereof are realized in a lightweight construction. So far, only steel and other cast materials are used as standard materials for this purpose.
• the clip part 6, but also the clip part 6 can be used Transport or chain part 7, as shown and described for example in Figure 3, be partially or completely executed in composite technology.
• parts of the clip part 6 as well as the chain part 7 can be made of one piece or composed of two or more components and connected to each other.
• the essential clip body part consists of a carbon fiber composite material in which only movable axle parts 127a are inserted from metal and, for example, the so-called knife flap 25c consists of a composite material or a light metal, wherein the Knife flap 25c is provided at least with a metal or light metal existing clamping tip or clamping head 125a, similar to the cooperating clip table 25e, which may for example be equipped or coated at least with a metallized steel or light metal layer.
• the lever tip is to be provided with a magnetic insert 125b (FIG. 4a). All of the measures described for reducing weight result in relevant advantages.
• the chain longitudinal forces can be reduced dramatically by the weight reduction, as shown schematically by the dotted lines in Figure 8.
• the weight reduction causes a reduction in the chain longitudinal forces, since the drag forces, the preload and centrifugal trains are lower.
• the chain pin can be designed optimized, or it can be reduced in size, and it can be further reduced weight.
• FIG. 8 shows in general that the chain longitudinal force is greatest at the drive of the outlet area, because the entire transport chain 13 is pulled over the driven discharge wheel.
• the conditions change with respect to the chain longitudinal force at the outlet and inlet.
• the transport chain 13 itself preferably consists alternately of an inner and an outer member, ie not of chain parts which are provided therebetween lying with a bend, wherein successively each of the deeper portion of a chain link is assembled with a subsequent higher portion of a next chain link.
• FIG. 3 for this purpose.
• a chain arrangement is preferably realized in which the transport chain is constructed comparable to a simple roller chain.
• link chains are also possible, such as multiple roller chains, rotary chains, etc. In this respect, reference is also made to other previously known chain constructions.
• a chain inner link 13.2 of the transport chain in FIGS. 4c and 4d is described here.
• inserts 113.1 are provided in order to store the axle bolts 13.7 and to achieve the necessary rigidity.
• tension straps 113.2 are inserted in addition to the prepregs.
• the curing and compression of the composite is carried out in vacuum and autoclave by the usual methods, such as prepreg or RTM (resin transfer molding) method. Preference is given to long-fiber scrims and composites, and the usual high-temperature-resistant polymers and epoxides are used as materials.
• FIG. 4c shows, by way of example, a section through the chain part KE through the axle center of the chain bolt 13.7 at right angles to the guide rail 15. Shown is a situation in which the clip and chain part 6, 7 are produced separately along a parting line T. The connection between the two parts is carried out, for example, screwing by means of screws 401, wherein the nut part of the screw is designed as insert 400, as shown in Figure 4c.
• the Kluppen chain units KK can be made only from one or more parts.
• the guide rail 500 shown in cross-section with reference to FIG. 5 also serves as a support rail of the tenter transport units KT and thus of the transport parts 7.
• the drive of the tenter transport units KT with the fastener parts 6 is not effected by a chain but by linear motors along the circulation path, which consists of stationary primary parts 502 and with the clip transport units KT movable secondaries 503.
• the clips ie the clip parts 6 with the transport parts 7 by means of the secondary parts 503 longitudinal process and moves.
• the transport parts 7 correspond to the chain parts 7 described in the preceding exemplary embodiment, since the transport parts in the preceding embodiment represent part of a transport chain.
• Both the mentioned primary and the mentioned secondary parts can be attached to one or more positions with respect to the guide rail 500 (top, bottom, side).
• the secondary parts 503 are made of permanent magnets, which are fixed in a holding cage 504, which in turn is attached to the clip body.
• the storage of the clips takes place via roller bearings 505.
• the guide and weight rail 500 (monorail) is shown in cross section to the longitudinal direction. It has a rectangular cross-section in the embodiment shown.
• At the two vertically oriented and mutually parallel running surfaces 500a run two pairs in the vertical direction offset from each other rollers or wheels 505, which rotate about vertical axes, not shown.
• At least one further pair of rollers which rotate about horizontal axes, run on the horizontal horizontal running surface 500b lying above and the parallel, ie horizontal, running surface 500b at a distance therefrom.
• the clip transport unit KT is divided into the actual clip part 6 and the transport or roller part 7 set therefrom.
• the clip transport unit (KT) is in the clip part 6 (with an overhead bridge B) and the adjacent clip or transport part 7 articulated. This separating plane T runs parallel to the vertical running surfaces 500a of the guide and support rail 500.
• the clip transport unit KT is balanced to a plane of gravity Sz (mz plane through the center of gravity GS), so stands here in balance.
• Sz plane through the center of gravity
• LISIM linear motor driven stretching machine
• clip insertion and reinforcement parts in lightweight construction materials can be used be used.
• Fig. 5a is shown along the parting line T.
• the clip and the clip knife 25c is largely made of lightweight material.
• inserts 602 and reinforcing members 603 are used at the design-related points.
• stiffening structures eg reinforcing tapes
• reinforcing mechanisms such as drawstrings and high-strength metal or polymer components, can be used anywhere in the lightweight construction sector, where this makes sense from the point of view of engineering engineering, and e.g. was determined by simulations.
• the clip transport units KT ie the actual clip part and / or the actual transport part
• the corresponding parts have a volume of more than 25%, in particular more than 30% %, 40%, 50%, 60%, 70%, 80% or even more than 90% of composite materials, in particular long-fiber composite materials or comprise, alone or in combination with other materials.
• composite materials are understood to mean all material combinations of two or more materials.
• a composite material consists of a so-called matrix, in which one or more other materials, so-called property components, are embedded.
• the components of a composite material can themselves be composites.
• the composite material has improved material properties than its individual components.
• MMC metal matrix composites
• AFK aramid fiber reinforced plastic
• CMC ceramic-ceramic composites
• TiGr composite fiber reinforced aluminum, sandwich constructions, bimetals, hylite, a sand wich structure of a plastic plate embedded between two aluminum plates / foils and ceramic fiber composites.
• a fiber composite material generally consists of two main components, namely a bedding matrix and reinforcing fibers.
• the matrix but also the property components can be made of metals such as aluminum, magnesium, etc., of polymers (thermo-thermosets, resins such as polyester resin, polyurethane resin (polyurethanes), epoxy resin, silicone resin, vinyl ester resin, phenolic resin, acrylic resin (PMMA), etc.) Combinations exist.
• thermo-thermosets resins such as polyester resin, polyurethane resin (polyurethanes), epoxy resin, silicone resin, vinyl ester resin, phenolic resin, acrylic resin (PMMA), etc.
• Fiber composite materials in particular long-fiber composite materials, are preferably used. In principle, however, it is also possible to use particle composite materials, layered composite materials, interpenetration composite materials, and structural composite materials.
• the fibers can run in one or more specific directions or have preferred directions. Fiber composites can be produced in layers.
• the matrix confers the composite and especially the fiber composite its appearance. This matrix also serves to hold the reinforcing fibers in place and to receive and distribute the corresponding forces and stresses. At the same time, the matrix protects the fibers from external influences, in particular also mechanical and chemical influences.
• the fibers provide the fiber composite with the necessary strength, including the required tensile strength and / or flexural strength.
• CFRP carbon and carbon fiber reinforced carbon
• Fiber-reinforced composite materials are used in which polymers are used as the matrix, namely, for example
• the compound of the composite materials is carried out by the usual methods, such as injection molding, insertion technique, Vakuumverguß, etc. Further processing can be carried out by known methods and methods, including the hardening and compression of the composite. This compression is usually done in a vacuum and autoclave. Such methods have become known, for example, under the keywords "prepreg” or "RTM (resin transfer molding)".
• the composites can be provided with reinforcing materials, structural components and inserts by well-known methods.
• casting materials for the clip part 6 as well as the chain part 7 can be used, which may consist of one of the following substances or may comprise a plurality of said substances.
• this thus leads to a drastic reduction in weight of the clip transport units regardless of the specific type of stretching system, which not only significantly reduces the friction-rolling and / or friction-sliding values but also the required energy input and heating is significantly reduced in the area of the guide rail and / or the mounting rail compared to conventional systems.
• the respective clip part 6 and the so-called secondary part provided with the linear motor drive transport part 7 should be designed more or less in weight so that the center of gravity level Sz is within the guide rail.
• the stretching forces and centrifugal forces engage symmetrically in the middle of the roller bearings on the guide rail.
• the weight of the clip part 6 and the weight of the chain or transport part 7 are therefore symmetrical with respect to the virtual weight symmetry plane Sz and therefore as equal as possible to the weight running surface 39 distributed, with the virtual weight symmetry plane Sz through the center of gravity GS and while parallel to the running surfaces 31, 33 of the shoe 39 'extends.
• FIG. 6 the center of gravity GS of the clip chain unit KK for the case of a transport chain-driven transverse stretching installation and in FIG. 7 the corresponding center of gravity GS of the clip transport unit KT for a linear motor-driven simultaneous stretching installation are shown by way of example, which in the exemplary embodiment shown in FIG Guide rail slider 29, that comes to rest in the middle region.
• the focus is to be considered in all three spatial directions, so we will talk about focus levels below.
• This weight force vector FG lies in a direction perpendicular to the plane extending virtual weight symmetry plane Sz, which extends in the longitudinal direction through the clip body, in which on a straight guide track of the clip body is moved longitudinally.
• the Gravity vector FG or the virtual weight-symmetry plane Sz extends centrally and symmetrically to the plain bearings 40 provided on the clip base 25f, thereby cutting the slide surface 39 vertically.
• two or more separate slide bearings 40a, 40b may be formed instead of a single slide bearing 40, whereupon the clip chain units KK (ie the respective clip parts 6 with the associated chain parts 7) with the corresponding weight on a corresponding support and / or running rail 17 ( Figure 2) slidably rest.
• the underside of these plain bearings 40, 40a, 40b (over which the clip-chain units KK are supported with their weight) is sometimes also referred to as a weight running surface 39.
• the one or more plain bearings 40, 40a, 40b have a maximum extension width 39 ', which is or are shown in FIG. 6, for example. It corresponds to the sum of the values x + y, where x is the distance between the vertical centroid plane Sz to the farthest point of the slide member 40a on the clip side and the distance y the distance from the centroid plane Sz to the farthest point of the slide member 40b on the chain side represents.
• a single sliding element 40 or a plurality of sliding elements 40a, 40b arranged at a distance from one another can therefore be provided.
• the sliding elements 40, 40a, 40b which do not pass centrally, so that the lateral distance X is different from the lateral distance Y, the sliding elements should be dimensioned in their length such that the surface pressures are equal with respect to the center of gravity plane Sz.
• the (correspondingly large) partial weight forces on the left or right in relation to the center of gravity plane Sz at the farthest points 40a 'or 40b' (s) should run so that the distance x is not equal to the distance y is, it should also be ensured in this case that the surface pressures on the left and right of the center of gravity plane Sz are equal, with the result that the surfaces of the sliding element or the plurality of sliding elements 40a, 40b left and right of the focal plane Sz be different sizes have to.
• the sliding surface can be ensured that the clip chain unit KK does not tip.
• the weight forces of the transport chain are tilting and torque-free, and completely independent of the horizontally acting forces supported on the support rail.
• Tension-tread height 231 or 233 which is supported on the corresponding running or outer surface 15a, 15b of the guide rail 15, so hereby interacts.
• This Bereic namely with the exception of the weight FB acting perpendicular to any further occurring forces, so that here also on the guide rail no tilting and torques can be introduced.
• all here acting perpendicular to the guide surfaces or sliding surfaces forces are tilting and torque-free supported on the guide rail, as well as the weight FG, which acts perpendicular thereto and should be supported without tilting and torque on the support and weight rail 17 in that this weight vector also intersects the corresponding running surface 17a of the support rail 17 in the region of the effective sliding surface formed there.
• the center of gravity plane Sz in the embodiment shown in FIG. 6 for the case of a transverse stretching installation using a transport chain or in the exemplary embodiment shown in FIG. 7 for a linear motor-driven simultaneous stretching installation with separately drivable clip transport units KT is now located within the Width of the guide rail 15.
• the stretching force FR still acts symmetrically in the middle of the lateral roller system.
• the chain longitudinal forces do not apply, due to the symmetrical structure the centrifugal forces FF in the stretching force level Y or in a parallel plane at a small distance WA1, for example, slightly above or below the stretching force level Y, the stretching force level Y coincides with the elevation of the clip table, on which the edge 8 of the film F is kept clamped in the stretching zone.
• the centroid plane Sz is arranged parallel to the mz plane within the thickness of the guide rail 15, wherein in Figure 6 with f, the horizontal and thus perpendicular distance between the vertical center of gravity plane Sz to the vertically extending chain force tread 31a and g indicates the corresponding horizontal distance to the vertically extending stretching force running surface 33a, ie the values for f and g are O.
• the sliding elements of the weight-force guide are far outside this gravity plane, so that no tilting moments can occur.
• the Gleitiatasystem is further optimized so that the same or nearly equal surface pressures are achieved symmetrically to the gravitational plane Sz either by the distances x, y or by different surface sizes.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
• Advancing Webs (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

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• 2012
  • 2012-12-20 DE DE102012025486.5A patent/DE102012025486A1/de active Pending
• 2013
  • 2013-11-28 WO PCT/EP2013/003598 patent/WO2014094967A1/de active Application Filing
  • 2013-11-28 US US14/654,222 patent/US20160185032A1/en not_active Abandoned
  • 2013-11-28 CN CN201380066815.3A patent/CN104870168A/zh active Pending
  • 2013-11-28 EP EP13798940.6A patent/EP2934855A1/de not_active Withdrawn

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