Press roll device for longitudinal stretching device, stretching device and method for changing press roll gap

Abstract

To provide a pressure roller device that comprises an improved pressure roller or a pinching roller, in particular a pressure roller or a pinching roller for a longitudinal stretching device (MDO: Machine Direction Orienter), and a method of operating the same.SOLUTION: In an improved pressure roller device for a stretching device and a proper method for operating the pressure roller device, the pressure roller device further comprises a driving device, and the driving device comprises or is composed of a direct drive unit or an indirect drive unit.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The invention relates in particular to a pressure roll arrangement for a longitudinal stretching device, to an associated stretching device and to a method for operating such a pressure roll arrangement. [Background technology]

[0002] Press rolls or nip rolls are used in various technical fields. These rolls are particularly important in the field of thin film (film sheet) production and longitudinal stretching of thin films. Press rolls are usually used when a thin film-like long material is conveyed by a roll and the press roll or nip roll is used to press the conveyed long material onto the outer surface of a cooperating roll (also called a deflection roll or forming roll).

[0003] In a longitudinal stretching device for thin plastic films, the thin film is longitudinally stretched between a series of rolls, with the roll jacket of each succeeding roll rotating or revolving faster than the preceding roll, causing longitudinal stretching of the thin film in the gap between the successive rolls.

[0004] The entire surface of the moving elongated material, particularly the resin thin film to be stretched, can be brought into contact with the outer casing of the forming roll by using a pressure roll or a clamping roll, thereby ensuring that the thin film is in contact correctly on each forming roll or deflection roll.

[0005] When using a wet process to manufacture battery separator film (BSF), oil is mixed into the resin film material (often polyethylene) and then extruded into a film.

[0006] Thereafter, in subsequent operation steps, the film passes through a simultaneous or sequential stretching device where it is stretched in the longitudinal direction and in a separate step in the transverse direction.

[0007] When stretching in the longitudinal direction, the film to be stretched is guided through a number of heated rolls to heat the film to the appropriate stretching temperature, with each successive roll rotating at a faster speed to effect longitudinal stretching, resulting in machine-direction (MD) stretching.

[0008] The thin film must be uniformly contacted on the roll or roll housing of the forming roll to achieve uniform heating or uniform stretching of the thin film while avoiding entrapment of air in the thin film. For this purpose, multiple pressing rolls, also called sandwiching rolls or nip rolls, are used.

[0009] The pressure or nip rolls gently press the film against the deflection or forming roll.

[0010] In the process of pressing the thin film, there is a problem that the pressing roll or the pinching roll cannot press the thin film (guided through the roll gap between the pressing roll or the pinching roll and the roll shell of the forming roll) strongly. When producing the battery separator thin film by the longitudinal stretching machine (MDO), the thin film is surrounded by an oil film in the production process upstream of the longitudinal stretching machine, so that the thin film (which does not rotate with the forming roll but moves between the stationary pressing roll or the pinching roll) may be worn by the pressing roll or the pinching roll, resulting in the formation of harmful scratches or defects on the thin film surface. Summary of the Invention [Problem to be solved by the invention]

[0011] The object of the present invention is to provide a solution for improving the pressing roll or the nipping roll, in particular to provide a pressing roll device with a roll pair including a pressing roll or a nipping roll and an additional roll for a longitudinal stretching device (MDO = Machine Direction Orienter), and to provide a corresponding method for operating the pressing roll device. [Means for solving the problem]

[0012] The present invention solves the problem of the press roll device with the features of claim 1 or 11, the problem of the stretching device with the features of claim 19 and the problem of the method for operating the press roll device with the features of claim 21. Advantageous configurations of the invention are described in the dependent claims.

[0013] The present invention is based on the new finding that in a process for producing and / or forming a moving elongated material, particularly a thin film or a resin thin film, particularly a process for producing a battery separator thin film from an oil-containing thin film, when the thin film contacts the rolling surface of a forming roll, non-compliant rotation between the pressing roll or the pinching roll and the thin film, or non-rotational sliding of the thin film in the roll gap, which causes harmful defects in the thin film, is prevented.

[0014] The pressing roll may be pressed with a higher contact pressure against the forming roll cooperating with the pressing roll or the clamping roll, which results in a higher pressure being applied to the thin film being guided through the pressing roll and the forming roll, with obvious consequences for the thin film properties.

[0015] For this reason, it has already been considered to form specific patterns on the surface of the pressing roll or the nipping roll to prevent the rolling surface from sliding against the oil-containing thin film (similar to the hydroplaning phenomenon). However, since the patterns formed on the surface of the pressing roll or the nipping roll are actually transferred onto the surface of the thin film, and the patterns also have an adverse effect on the properties of the thin film, this should also be avoided.

[0016] The present invention proposes a solution using a press roll as a driving part. The drive of the press roll (drive roll) is realized so that the outer circumferential speed of the press roll or the clamp roll can be made substantially equal to the outer circumferential speed of the forming roll. In other words, by using a driven press roll, the outer circumferential speed of the cooperating driven press roll and forming roll can be at least substantially synchronized, avoiding the defects that occurred in the past.

[0017] In the present invention, the pressing roll or the nipping roll is driven directly or indirectly.

[0018] When realizing the direct drive of the pressing roll and the pinching roll, it is preferred to directly insert and install the drive from the end face area of ​​the actual pressing roll and pinching roll. The entire wearable drive can be formed by projecting only 50% or clearly less than 40% at the end face beyond the actual rotating body of the pressing roll or pinching roll. A structure is preferred in which the drive motor is accommodated in part of the length of the projecting area. For example, the optionally provided subsequent coupling device comprises a radial drive, a coupling device attached axially to the roll end face and a subsequent end face ring, the output shaft of the drive motor and a gear device in the form of a suitable planetary gear following the output shaft are fixed via the coupling device and are rotationally connected to the rotating body of the pressing roll or pinching roll. The entire pressing roll device projects outward at the end face and is held via a stationary part.

[0019] A preferred wearable drive with a drive motor forms a fixed bearing. A replica formed to the same dimensions and size as the wearable drive is preferably mounted on the opposite end surface of the pressing roll or the nipping roll. The replica, which has the function of supporting the pressing rotor, preferably forms a floating bearing.

[0020] As a result, the pressure roll and the clamping roll are not supported by a support that passes continuously through the pressure roll and the clamping roll, but by a central portion between the pressure roll and the clamping roll and a fixed bearing and a floating bearing configuration that engages only a portion of the entire length of the hollow central shaft.

[0021] The detachable drive unit can be attached and detached without any problems.

[0022] The driving device for the pressure roll and the pinch roll can also be realized in an indirect driving form.

[0023] As an indirect drive, the invention proposes a pressing roll or a clamping roll with at least a contact drive. The pressing roll is preferably provided with two contact drives axially spaced apart from one another, forming an actual thin film pressing area between the two contact drives, which press the thin film to be formed against a forming roll arranged parallel to and adjacent to the thin film pressing area, thereby ensuring optimal contact of the thin film with the forming roll. At least one, preferably at least two, contact drives have a diameter larger than the diameter of the actual thin film pressing area of ​​the pressing roll, at least in the unloaded state, and the two contact drives allow the thin film to come into contact or to be brought into contact with the forming roll.

[0024] At least one, and preferably two, contact drive parts comprise a material that is compressed by the application of pressure or are made of a compressible material.

[0025] The thickness of the material to be compressed by pressure and / or the corresponding material itself are selected so that when the corresponding pressure roll or clamping roll is inserted, when it approaches the rolling surface of the parallel arranged forming roll, the outer peripheral surface of the contact piece and / or drive piece of the pressure roll or clamping roll first comes into contact with the rolling surface of the forming roll.

[0026] As the pressing roll or the pinching roll approaches, the contact material provided on at least one contact piece and / or driving piece is compressed while reducing the roll diameter, and at this time, due to the frictional connection with the roll outer casing of the forming roll, the pressing roll or the pinching roll rotates faster, and finally the outer circumferential speed of the pressing roll or the pinching roll is synchronized with the outer circumferential speed of the forming roll, and the pressing roll or the pinching roll rotates until they reach the same speed.

[0027] For example, it is preferable that the outer peripheral speed of the pressing roll or the pinching roll is finally synchronized with the outer peripheral speed of the forming roll before the thin film or the long material is pressed through the pressing roll or the pinching roll toward the forming roll and is guided by being pinched in the roll nip between the pressing roll and the forming roll. If the outer peripheral speed of the pressing roll differs from that of the forming roll, there is a risk that damage will be formed on the surface of the thin film guided through the roll nip, but if the outer peripheral speed of the pressing roll is synchronized with that of the forming roll to press the thin film against the forming roll, the risk of damage to the surface of the thin film is minimized.

[0028] It is preferred that the elongated material to be molded, in particular the thin film, has a width narrower than the axial distance between two contact pieces and / or drive pieces provided on the pressing roll, and the thin film contacts the molding roll between the two contact pieces and / or drive pieces to ensure that the pressing roll or the pinching roll always contacts or can contact the surface of the cooperating molding roll via the contact pieces and / or drive pieces, and always rotates the pressing roll at an appropriate rotation speed. In this way, the outer peripheral speed of the jacket coincides with the passing speed of the elongated material or the thin film, and therefore damage to the resin thin film is avoided.

[0029] Any material having the desired properties may be considered as the compressible material for the drive region, for example rubber or rubber-like materials such as silicone, elastically compressible materials are suitable.

[0030] In particular, in a preferred variant of the invention, the actual pressing or pinching roll itself does not form suitable contact pieces and / or drive pieces, but a suitable compressible jacketing material is provided on the ring, which is connected to the actual pressing or pinching roll by directly or indirectly rotatably fixing the ring to the opposite end face of the pressing or pinching roll. The solution of the invention can be used when the corresponding pressing or pinching roll is not driven and does not rotate via a length of material or a film guided between the pressing or pinching roll and the forming roll. In particular, it has been found to be particularly advantageous in that an indirect drive of the pressing or pinching roll can finally be realized, even outside the oil-containing film area (outside the working width of the film and to the side of the oil-containing film), even if the friction forces between the oil-containing film and the pressing or pinching roll are small or even if "hydroplaning" can occur between the film and the pressing roll. It has also been found that the present invention provides a solution for co-rotating the pressing or nipping rolls via the rotating forming roll, which has the advantage of avoiding the use of expensive drive fixtures that require mechanical and / or electrical components to drive the pressing or nipping rolls.

[0031] Another advantage of the inventive solution is that no additional space is required for the rotation of the pressing or pinching rolls, since in the inventive solution only the pressing or pinching rolls with their contact pieces and / or drive pieces (which in the unloaded state have a larger outer diameter than the membrane pressing part between the two contact pieces and / or drive pieces) are required, which is a major advantage, especially in the field of drawing devices, since no space is required for the arrangement of additional drive fittings as is usually the case.

[0032] In the alternative embodiment of the present invention, the pressing roll or the pinch roll is not provided with a drive, but is indirectly driven by the surface contact between the contact piece and / or the drive piece and the forming roll, so that the length or film conveyed between the contact piece and / or the drive piece is better "held" on the forming roll and prevented from sliding off, which can occur especially with a film containing a large amount of oil.

[0033] Although smoothly ground pressure rolls and clamping rolls have the fundamental drawback of the prior art, that is, the thin film to be formed moves along the smoothly ground pressure roll surface, and the pressure roll or clamping roll itself does not rotate integrally, which can cause the above-mentioned defects, the present invention can be optimally realized, particularly with smoothly ground pressure rolls.

[0034] In the present invention, the pressing roll is realized in contact with the forming roll via two suitable contact pieces and / or drive pieces arranged at a distance from each other in the axial direction of the pressing roll, so that it can rotate. Between the pressing roll and the forming roll, a length of material in the form of a plastic film is passed and guided. It is basically possible for a single axial contact drive arranged for the film guided past the pressing roll to realize an asymmetric solution in which the pressing roll or the clamping roll is rotated in contact with the adjacent forming roll. However, a symmetric solution with two contact pieces and / or drive pieces is more preferred.

[0035] The contact piece and / or the driving piece may be divided into a plurality of pieces, and may be composed of any number of sub-components. Even in this case, the sub-components as a whole are referred to as the contact driving part.

[0036] BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described in detail with reference to the accompanying drawings, in which: FIG. [Brief description of the drawings]

[0037] [Figure 1] FIG. 1 is a side view showing details of a longitudinal stretching device; [Diagram 2] FIG. 1 is a schematic front view of a pressure roll or nip roll device according to the present invention; [Diagram 3] 3 is a side view of the pressing roll device of FIG. 2; [Figure 4] FIG. 3 is a schematic side view of the pressing roll device and the corresponding forming roll of FIG. [Figure 5a] A partial cross-sectional view of the pressure roll device of the present invention with a ring piece attached. [Figure 5b] FIG. 5b is a partial cross-sectional view showing a modified embodiment of the present invention different from that of FIG. 5a; [Figure 6a]FIG. 5b is a perspective view of the ring piece shown in FIG. [Figure 6b] FIG. 5b is a perspective view of the ring piece shown in FIG. [Figure 7] A perspective view of a ring piece protruding from a pressing roll without a direct drive or imitation. [Figure 8] FIG. 1 is a perspective view of a direct drive used in the practice of the present invention; [Figure 9] FIG. 1 is a perspective view showing a driving unit directly attached to an end of a rotating body used in the practice of the present invention; [Figure 10] Cross-sectional view showing a direct drive mounted on a rotor suitable for large roll diameters [Figure 11] FIG. 11 is a cross-sectional view showing a modified embodiment of FIG. 10 in which a direct drive unit is attached to one end of the rotor and a replica is attached to the other end, and the central portion of the rotor is not shown. [Figure 12] Cross-sectional view of a small-diameter roll with a direct drive unit attached to one end of the roll DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] 1 is a schematic side view of a longitudinal stretching device 3 equipped with a number of forming rolls (also called deflection rolls). The longitudinal stretching device 3 is also called a longitudinal stretching device 3 or a longitudinal stretching machine 3.

[0039] The extruder to be placed on the left side of the longitudinal stretching device 3 shown in FIG. 1 typically extrudes a melt from a slit die onto a cooling roll rotating in a water bath to produce a thin film material of a resin thin film. An extruder without a water bath can also be used. Also, a bath using any cooling liquid (e.g., a solvent or any mixture) can be used. In that sense, the embodiment is not limited to a specific cooling method.

[0040] The hardened and / or crystallized thin film is typically fed to a longitudinal stretching device 3 from the left side of Fig. 1, then passes through a number of rolls 5 in a serpentine manner and exits the longitudinal stretching device on the right side of Fig. 1. When the film undergoes additional stretching in the transverse direction after being processed by rolls 5, the film is fed to a transverse stretching device (TDO). For further information in this regard, reference is made to known apparatus and stretching methods for producing molten thin films.

[0041] In the longitudinal stretching device, the thin film F runs around each partial wrap angle of a plurality of rolls 5, and the thin film transported at a corresponding outer shell peripheral speed is placed on the corresponding rolling surface 7 or roll outer shell 8 at the partial wrap angle.

[0042] Between two successive rolls, the trailing roll 5 is driven at a faster outer peripheral speed in the withdrawal direction 9 than the preceding roll 5, and the thin film is stretched longitudinally between the rolls 5, so that the thin film material moving through the longitudinal stretching device is longitudinally stretched in the free portion between the two successive rolls, as in the above example for the resin thin film (referred to as thin film F).

[0043] To hold and maintain the thin film at the optimum drawing temperature, each of the plurality of rolls 5 is heated to an optimum temperature.

[0044] During heating of the rolls 5, a thin film must be applied or contacted uniformly on the rolling surfaces 7 or roll housings 8 of the rolls 5 and in a manner that avoids entrapment of air.

[0045] For this purpose, a number of pressing rolls 11, also called sandwiching rolls or nip rolls, are provided in the longitudinal stretching device 3. Figure 1 shows a number of rolls or stretching rolls 5 with open circles, which are larger in size than the pressing rolls 11 (shown completely with black circles).

[0046] A plurality of rolls or stretching rolls 5' each having a small diameter and denoted by white circles are provided in the intermediate region of the longitudinal stretching device 3. Two pressing rolls 11 are provided for each roll or stretching roll 5'. One pressing roll 11 presses a thin film onto the rolling surface of the roll 5', and the other pressing roll 11 removes the thin film from the rolling surface of the roll 5'.

[0047] Fig. 2 is a front view (axial cross-sectional view perpendicular to the longitudinal extension direction) showing a first embodiment of a press roll device of the present invention including a press roll or nip roll 11. Fig. 3 is a side view seen from the direction of arrow 13 in Fig. 2. The press roll 11 has an axial length L between end face regions 15.

[0048] In the illustrated embodiment, for example, a stepped shaft end 17 having two shaft end pieces 17a and 17b is formed or can be formed in the opposing end face region 15 beyond the axial length L of the actual pressing roll 11, and the diameter of the shaft end pieces 17a and 17b is smaller than the diameter 21 of the actual pressing roll 11.

[0049] In the embodiment of FIG. 2, the press roll device includes a press roll 11 having a shaft tail 17 (the number of stages of the shaft tail 17 is not limited to single or multiple), and the press roll 11 has a rotor 11a or a rotary drum 11a on which a rolling surface 11b is formed. In the illustrated embodiment, the press roll 11 is provided with a thin film pressing region 11c and a contact piece and / or drive piece (contact drive piece) 27 fixed to the thin film pressing region 11c, which is axially spaced apart from and faces the thin film, and which presses the thin film. The contact piece and / or drive piece 27 following the thin film pressing region 11c has an axial length L shorter than the overall length L of the press roll 11. X In this embodiment, the thin film pressing region 11c of the pressing roll 11 has at least a length L WKA has.

[0050] The diameter 29 of each contact piece and / or drive piece 27 in the unloaded state is greater than the diameter 21 of the thin film pressing area 11 c of the pressing roll 11 between both contact pieces and / or drive pieces 27 .

[0051] The roll mantle 8, i.e. the rolling surface 7, behind the contact piece and / or driving piece 27 coaxial with the rotation axis or central axis 31 of the pressure roll 11 shown in FIG.

[0052] In other words, the radius R of the thin film pressing area 11c (area between the contact piece and / or the driving piece 27) FAB and the radius R of the contact piece and / or driving piece 27 area KA There is a diameter difference of 33 (Figure 2) between them.

[0053] The contact piece and / or the drive piece 27 are formed of a compressible sleeve 32, the outer peripheral area of ​​which is covered by a jacket layer or jacket stack 32a, which comprises at least a suitable thickness of a compressible material, for example a rubber or rubber-like material, such as silicone, a suitable material that is resiliently compressible. The significance of the compressible sleeve 32 will be explained below.

[0054] In carrying out the invention, the position of the pressing or pinching roll 11 is adjusted by a suitable angle setting device and / or by a suitable setting device so as to approach the surface of the cooperating deflection or forming roll 5, 5' and form a roll gap 34 between the rolling surface 7 of the roll 5, 5' and the rolling surface 11b of the pressing or pinching roll 11 (FIG. 4).

[0055] Since the diameter of the contact piece and / or drive piece 27 area of ​​the pressing roll 11 is larger than the diameter 21 of the thin film pressing area 11c, when the pressing roll 11 and the deflection or forming roll 5 or 5' are brought closer together by shortening the lateral distance between them, the outer periphery or surface 27a of both contact pieces and / or drive pieces 27 first comes into contact with the rolling surface 7 or roll outer shell 8 of the deflection or forming roll 5 or 5' arranged parallel to the pressing roll 11 (the pressing roll or pinching roll 11 is arranged parallel to the roll 5 or 5'). Since the diameter difference 33 at this point between the outer periphery 27a of the contact piece and / or drive piece 27 and the rolling surface 11b of the thin film pressing area 11c is larger than the thickness of the elongated material or thin film F guided through the roll gap 34, the pressing roll 11 does not apply pressure to the elongated material or thin film F in the thin film pressing area 11c.

[0056] When the contact pressure by the contact pieces and / or drive pieces 27 against the rolls 5, 5' is increased, the compressible material of each contact piece and / or drive piece 27, made of a suitable elastic polymer (elastomer), is pressed harder, so that the roll gap 34 between the pressing roll 11 and the deflecting or shaping roll 5, 5' is reduced, and the pressing force of the pressing roll 11 brings the rolling surface 11b of the pressing roll 11 between the contact pieces and / or drive pieces 27 into contact with the thin film being guided through the roll gap in the thin film pressing area 11c, and when the thin film has completed its passage through the roll gap, the rolling surface 11b of the pressing roll 11 presses against the surface of the roll 5 or 5' with the desired contact force.

[0057] Thus, the contact pieces and / or driving pieces 27 of the pressing or pinching roll 11 first come into contact with the rotating deflection or forming roll 5, and due to the friction occurring between the rolling surfaces 7 of the rolls 5, 5' and the contact pieces and / or driving pieces 27, the pressing and pinching rolls 11 increase in rotation speed from the stationary (non-rotating) starting position, so that both rolls rotate synchronously and finally reach the same outer circumferential speed in cooperation. Only when the synchronous peripheral speeds reach the same speed, the elastic material of the contact pieces and / or driving pieces 27 is strongly compressed, and as shown in FIG. 4, the compression of the contact pieces and / or driving pieces 27 causes the radius R FAB and the actual radius R of the contact piece and / or the driving piece 27, which is equal to the minimum dimension of the film width (thickness) FD, i.e., the roll gap 34. KA It is preferable to compress the

[0058] This realizes an indirect drive section of the pressing roll 11 that performs indirect driving via the rotation of the roll 5 cooperating with the pressing roll 11 without using a direct drive section of its own. The indirect drive section is also effectively realized when the rolling surface 11b of the rotating body 11a and / or the thin film pressing area 11c are polished completely smoothly.

[0059] 4, the thin film width FB is at least 1%, preferably at least 5% or at least 7.5% or at least 10% narrower than the gap between the opposing surfaces 27b of both contact pieces and / or driving pieces 27. Since the elongated material or thin film F is ultimately guided substantially within the gap between the opposing surfaces 27b, the oil-impregnated elongated material or thin film F does not slide axially on the surface of the roll 5 or deviate from the surface of the roll 5 even if it is slippery.

[0060] It should be noted that the compressible sleeve 32 of at least one contact piece and / or drive piece 27 can be compressed under pressure within the following ranges: a) the diameter of at least one contact piece and / or driving piece 27 is equal to or less than 5%, 4%, 3%, 2%, 1%, or 0.5% larger than the diameter of the thin film pressing area 11c of the pressing roll 11; or b) A range in which the diameter of at least one contact piece and / or driving piece 27 is larger than the diameter of the pressing roll 11 in the thin film pressing area 11c by the thickness of the resin thin film F guided along the thin film pressing area 11c.

[0061] Two embodiments of the present invention which are partially modified from the above-described embodiment will be described below with reference to Figs. 5a to 6b.

[0062] The embodiment shown in Figures 5a to 6b shows a contact piece and / or drive piece 27 equipped with a ring piece 35, with Figure 6a showing a front perspective view of the ring piece 35 and Figure 6b showing a rear perspective view of the ring piece 35.

[0063] The ring piece 35 is fixed to the rotating body 11a of the pressing roll or the pinching roll 11 so as to be rotatable together with the rotating body 11a (FIGS. 5a and 5b). FIGS. 5a and 5b show only a cross section of the ring piece 35 fixed to the rotating body 11a.

[0064] 6a and 6b show a ring piece 35 having a ring piece inner diameter 35b equal to or at least slightly larger than the outer diameter of the roll outer casing 8, and a cylindrical ring piece outer casing 35a. One end face 35c of the ring piece 35 shown in Figs. 6a and 6b has a flange 35d (also called an end face tongue piece 35d) protruding radially inward, and a plurality of screw holes 35e formed in the flange 35d. Screws for fixing the ring piece 35 to the end face 15 of the pressing roll 11 are coupled to the screw holes 35e, and the ring piece 35 is fixed to the pressing roll or the pinching roll 11 so as to be rotatable together with the pressing roll or the pinching roll 11.

[0065] 5a and 5b, each ring piece 35 is not fixed directly to the end face of the pressing or pinching roll 11 by screws (although this is possible), but can be fixed by a fixing ring 36 (which is also provided with holes coaxial with the holes 35e in the flange 35d of the ring piece 35). The flange 35d is clamped between the end face 15 of the pressing or pinching roll 11 and the fixing ring 36.

[0066] As can be seen from Figures 6a and 6b, the end tongue 35d is formed as a ring-shaped flange that forms an inner opening 35f, and it is preferable that the inner opening 35f through which the buttock 17 passes has a diameter larger than the diameter of the buttock 17.

[0067] Alternatively or additionally to the embodiment shown, provision can also be made for a ring piece 35 to be attached to the butt 17 of the pressure or clamping roll 11 .

[0068] In the illustrated embodiment, for example, a sleeve 32 of sufficient thickness can be press fitted onto the outer periphery of ring piece housing 35a to provide an outer periphery or housing layer 32a on ring piece 35 so that suitable contact and drive pieces 27 can be conveniently retrofitted to ring piece 35. In Figures 6a and 6b, it is preferred to cover the outer periphery of ring piece housing 35a with a resiliently compressible housing layer 32a.

[0069] 6a and 6b show perspective views of suitable loops from opposite directions which are attached to the pressure or nip rolls 11. FIG.

[0070] In the modified example shown in Figure 5a, the pot-shaped ring piece 35 is attached to the pressing roll or clamping roll 11 by a ring-shaped flange 35d (usually an end surface tongue piece 35d), and the ring piece outer cover 35a forming the contact piece and / or pressing piece 27 covers the outer peripheral region of the pressing roll 11 from the end faces of the pressing roll and clamping roll 11 inward, and the corresponding end of the pressing roll or clamping roll 11 is fitted into the ring piece-shaped or pot-shaped storage space of the ring piece 35.

[0071] The outer peripheral surface 27a of the outer covering layer or outer covering laminate 32a of the ring piece 35 protrudes from the rolling surface 11b, but the amount of protrusion of the outer peripheral surface 27a relative to the rolling surface 11b is very small, so that the outer diameter area of ​​the pressing roll or pinching roll 11 recessed radially inward from the outer peripheral surface 27a of the ring piece 35 is small. The outer diameter of the pressing roll or pinching roll 11 corresponds to the free inner diameter of the ring piece 35 in an unconstrained state or is preferably at least slightly smaller than the ring piece 35, so that the ring piece 35 can be pushed and fixed to the rotating body without problems during installation. The reduced diameter axial projection 17c provided on the end face of the pressing roll or pinching roll 11 is fitted into the opening 35f formed in the flange 35d of the ring piece 35, and the outer diameter of the axial projection 17c is at least slightly smaller than the inner diameter of the opening 35f. The disk-shaped axial projection 17c is engaged in or protrudes through the opening 35f.

[0072] The dimensions of the outer surface of the ring piece 35 and / or the thickness dimensions of the compressible sleeve 32 formed on the ring piece 35 are as described in the above embodiment, and it is preferable to configure the contact piece and / or pressing piece 27 integrally with the pressing roll or clamping roll 11.

[0073] In other words, the pressing roll or clamping roll 11 (Figures 2 and 3) is composed of three parts including a rotating body 11a that constitutes the thin film pressing area 11c and two pressing pieces 27, but in the pressing roll 11 of the embodiment in Figure 6a, the ring piece 35 formed as a separate part is attached (removably) to each pressing piece 27 that constitutes the end face of the rotating body 11a of the pressing roll or clamping roll 11 by adjusting its position in the axial direction.

[0074] The variant embodiment of Fig. 5b shows an axial section of a ring piece 35 which is fixed in a non-rotatable manner at the end or end face region of a basically similar pressing or pinching roll 11. Fig. 5b, which is rotated by 180° (inverted) from the variant of the embodiment shown in Fig. 5a, shows a hollow cylindrical ring piece 35 which is constructed in a pan-like manner by a partially annular or loop-shaped ring-shaped flange 35c and which is attached to the pressing or pinching roll 11. The hollow cylindrical ring piece 35 and the opening 35f of the ring piece 35 do not fit into the thin film pressing region 11c having a diameter 21, but the opening 35f of the ring piece 35 fits into the axial projection 17c of the shaft tail 17, so that the shaft tail 17 protruding from the end face of the pressing or pinching roll 11 protrudes from the ring piece 35.

[0075] This allows the pressing roll or pinch roll 11 to be provided with the rotating body 11a having the same diameter along the entire axial length L of the roll outer casing or rolling surface 11b of the rotating body 11a.

[0076] Since the rotors 11a only need to be constructed with an axial length at least slightly greater than the working width or the width of the thin film to be formed, the axial length of the actual rotors 11a of the pressing or clamping rolls 11 can be shortened during formation. The actual contact and drive pieces 27 are attached to the corresponding rotors 11a, and the outer surfaces of the contact and drive pieces 27 are not coated.

[0077] In the above embodiment, a ring piece 35 is fixed to the end surface of the pressing roll 11 or the rotating body 11a, and a suitable pressing material and / or contact material that can be compressed under pressure is formed into a hollow cylindrical shape with an appropriate outer covering thickness and provided on the ring piece 35. After the rolls 5, 5' start to come into contact with the rolling surfaces 7 of the rolls 5, 5', the actual pressing roll 11 can be rotated by frictional contact between the rolls 5, 5' and the ring piece 35.

[0078] For example, during normal operation, the pressing roll 11 can only apply pressure to the thin film when it reaches a certain outer jacket peripheral speed (corresponding to at least 50% of the outer jacket peripheral speed of the rotating roll 5). When the thin film pressing area 11c of the pressing or pinching roll 11 contacts the elongated material or thin film F and presses the thin film F against the rolls 5, 5' with an optimal desired pressing force not exceeding a predetermined limit value, the outer jacket peripheral speed of the pressing roll 11 is preferably at least 60%, preferably at least 70%, 80%, at least 90% or 95% and suitably 100% of the outer jacket peripheral speed of the roll 5 or 5'.

[0079] It should be noted that when the thin film pressing area 11c of the pressing roll or pinch roll 11 contacts the elongated material or thin film F and presses the thin film F with an optimal desired pressing force not exceeding a predetermined limit value against the rolls 5, 5', the contact piece and / or drive piece 27 do not necessarily need to be the ring piece 35. It is sufficient to use a roll-shaped, cylindrical (cylinder)-shaped, for example, wheel-shaped, tire-shaped or similar-shaped contact piece and / or drive piece 27 constituting the fixed part of the pressing roll 11, but there is no need to be limited to these and they may be separate parts. It is preferable that the separate additional part provided in the form of a ring piece can be retrofitted to the pressing roll or pinch roll 11 while forming the contact piece and / or drive piece 27.

[0080] Thus, the contact piece and / or drive piece 27, which may be a fixed or integral part of the pressing roll or clamping roll 11, can also be attached to the pressing roll or clamping roll 11 as a part that can be added later. The ring piece 35 is particularly suitable for the present invention. For example, only a single ring piece needs to be used with only a single contact piece and / or drive piece 27, so that the use of only a single contact piece and / or drive piece 27 may be sufficient, as described above.

[0081] The pressing roll or nipping roll 11 used in the direct driving unit 39 of the present invention, instead of the indirect driving device shown in the above embodiment, will be described with reference to Figs.

[0082] For example, Fig. 7 is a perspective view showing the thin film pressing region 11c of the pressing roll or pinch roll 11 and an end (ring piece) 35 of the pressing roll 11 protruding from the end of the thin film pressing region 11c. Fig. 7 shows a cavity 37 formed penetrating the ring piece 35 and the pressing roll or pinch roll 11, and a direct drive unit 39 (Fig. 8) is attached to the cavity 37.

[0083] A drive unit 39, also called a direct drive unit 39, can be directly inserted and attached to the end face 15 of the pressing roll 11 in the axial direction.

[0084] For example, FIG. 8 shows a perspective view of a direct drive unit 39.

[0085] An alternative construction for the direct drive 39 will now be described with reference to FIG.

[0086] FIG. 9 shows the state in which the direct drive unit 39 of FIG. 8 is inserted into the cavity 37 of the pressure roll and the nip roll 11 and fixed to the end face 36.

[0087] 8 and 9 show perspective views of the direct drive 39 with the mounting part 41 protruding from the rotor 11a in the assembled state. Various connections are provided on the mounting part 41. In this embodiment, the connection is a flush air connection 91. On the opposite side of the flush air connection 91 at an angle of 180°, for example, a second flush air connection can be provided.

[0088] The electrical connection 101 provided on the connection part 41 serves in particular as an electrical plug or plug connection for supplying electrical energy to the electric motor 64. The electrical plug or plug connection is necessary for signal communication conductors and power conductors to be introduced inside the stationary housing 51.

[0089] FIG. 10 shows an axial cross-sectional view of the pressing roll or pinch roll 11 with a direct drive 39 mounted in the cavity 37 of the ring piece 35 from the end face 36 side, and a roll support or holding form imitation 42 (FIG. 11) is provided on the opposing end face 36 of the pressing roll 11. The function and outside dimensions of the imitation 42 can be formed in a form corresponding to the direct drive 39. A structure in which a drive housing 51 serving as a support device for the direct drive 39 is attached to a mounting part 41 that protrudes the rotatable pressing roll and pinch roll 11 to the outside of the direct drive 39 is preferable. The direct drive 39 is arranged inside the mounting part 41 on the fixed bearing side, and the imitation 42 provided on the mounting part 45 on the axial opposite side to the mounting part 41 becomes a floating bearing side that absorbs or compensates for thermal distortion when the longitudinal thermal expansion coefficients of the pressing roll and the pinch roll 11 are different.

[0090] The configuration of a first embodiment of a direct drive unit 39 incorporated in the pressing roll or the pinch roll 11 will be described with reference to FIG.

[0091] The direct drive unit 39 is composed of a stationary part and a rotating part.

[0092] The drive housing 51 formed in a hollow cylindrical shape directly constitutes the stationary part of the drive unit 39. The drive housing 51 shown in Fig. 10 is formed, for example, in two parts, a hollow cylindrical housing ring 51a and a housing end 51b forming the mounting part 41 fixedly connected to the housing ring 51a. Alternatively, as shown in Figs. 11 and 12, the drive housing 51 may be formed at least substantially integrally with the housing ring 51a which becomes the ring piece 35 and the housing end 51b which forms the mounting part 41.

[0093] The outer periphery of the drive housing 51 rotatably supports a rotating part arranged outside the direct drive unit 39 via a rolling bearing 55. Basically, the support structure of the rolling bearing 55 can be configured taking into consideration known technology. As shown in the figure, two rolling bearings 55 arranged adjacent to each other in the axial direction are accommodated as bearings between the housing part 51a and the torque transmission device 77.

[0094] The rotating shaft or central axis 31 axially penetrating the pressure roll and the clamping roll 11 and the stator 63 concentric with the entire drive unit 39 are arranged in a non-rotating, stationary state within the inner chamber 59 of the drive housing 51 and are ultimately held directly or at least indirectly inside the drive housing 51, for example, as shown, preferably by providing an inner ring 62 (housing ring 51a) as part of the drive housing 51 (embodiment of Figure 12) to form the drive unit 39.

[0095] A rotor 65 constituting the electric motor 64 is disposed radially inward of the stator 63 .

[0096] A rotor 65 is disposed around a drive shaft 67 that passes through the rotation axis or central axis 31, and the drive shaft 67 is rotated relative to the stator 63 by electrical energy from the rotor 65. A gear 69, for example a planetary gear, is disposed at a position axially spaced from the opposing end face 36 and is disposed within the cavity 37 of the ring piece 35 inside the drive housing 51.

[0097] The output shaft 71 protrudes from the gear 69 as an axial extension of the drive shaft 67. In this embodiment, the output shaft 71 is connected to a radial torque transmission piece 75 which constitutes part of a pot-shaped torque transmission device 77 by a selective coupling part (not shown), thereby adjusting the angle, radial and / or axial position of the output shaft 71. The torque transmission device 77 is formed on a flange or mounting ring 83 via a ring-shaped outer step part. When the drive part 39 is directly inserted into the torque transmission device 77, the flange or mounting ring 83 abuts against the end face 36 of the pressing roll 11 and covers the end face 36.

[0098] The direct drive unit (drive device) 39 shown in Figure 10, housed in the drive housing 51, is surrounded by a number of rotating parts connected to the rotating body 11a, in particular a deep pot-shaped or hollow cylindrical torque transmission device 77, which is connected via a pot bottom in the form of a radial torque transmission piece 75 to a rotating member driven by an inner electric motor 64, and is connected from the rotor 65 to a drive shaft 67, a gear 69, an output shaft 71 and an appropriate selective coupling part not shown.

[0099] The stationary drive housing 51, which protrudes outward at its end from the rotating body 11a, is accommodated between the drive system including the gears 69 and a pot-shaped or hollow cylindrical torque transmission device 77 spaced radially from the drive system, and the stationary drive housing 51 is attached and fixed to the support device via a mounting part 41 which also rests at its end.

[0100] The rotating parts arranged inside (rotor 65, drive shaft 67, gear 69, drive shaft 67 and coupling (if provided)) are supported via two ring or rolling bearings 53 and 54, and are preferably arranged axially offset from the drive part 39, with an electric motor 64 with a stator 63 and a rotor 65 being arranged between the two rolling bearings 53, 54. The two rolling bearings 53 and 54 directly or indirectly support the drive shaft 67 relative to the stationary parts of the drive part 39, i.e. the stationary drive housing 51. In the embodiment shown, the rolling bearing 53 arranged inside is supported at a distance from the stationary hollow cylindrical drive housing 51 via a stepped ring 56.

[0101] A pan-shaped or hollow cylindrical torque transmission device 77 (rotating part) arranged outside the drive housing 51 includes an attached first cylindrical part 77a and a second step part 77b, and a second rolling bearing 79 arranged inside the cavity 37 of the rotor 11a is arranged axially apart from the first rolling bearing 55 provided near the end face 36, and is supported by the torque transmission device 77 via the second rolling bearing 79 arranged close to the end of the drive housing 51 and radially adjacent to the torque transmission piece 75. The second rolling bearing 79 can also be formed as a double row rolling bearing. An intermediate ring piece 80, which functions to transmit a supporting force between the drive housing 51 and the second rolling bearing 79, is fixedly connected to the drive housing 51. The intermediate ring piece 80, which is arranged at a radial and axial distance from the gear 69, is also arranged at a radial distance from the torque transmission piece 75, so that the supporting force transmitted to the pot-shaped torque transmission device 77 only via the drive housing 51, the intermediate ring piece 80, and the rolling bearing 79 does not act on the gear 69.

[0102] A plurality of stationary components, particularly the drive housing 51, are arranged at small radial intervals inside the rotating pot-shaped or hollow cylindrical torque transmission device 77, forming the pot-shaped torque transmission device 77. As described above, the pot-shaped torque transmission device 77 is composed of, for example, a first cylindrical portion 77a continuing to the rotating housing bottom 75 (torque transmission piece 75), and a step portion 77b expanding from the first cylindrical portion 77a toward the end face 36 and in the radial direction. In other words, the pot-shaped or hollow cylindrical torque transmission device 77 has a hollow cylindrical expanded step portion 77b arranged close to the end face 36, and the dimensions of the expanded step portion 77b are determined in a form in which the rolling bearing 55 is accommodated between the cylindrical wall portion of the expanded step portion 77b and the stationary drive housing 51. As shown in the figure, two rolling bearings 55 are arranged and accommodated inside the expanded step portion 77b adjacent to each other in the axial direction.

[0103] Next, a mounting ring 83 forming the end face 36 of the pressing roll 11 is provided on the torque transmission device 77, a plurality of axial holes 85 are formed in the mounting ring 83 at intervals in the circumferential direction, and a plurality of fixing screws 87 can be fitted into the plurality of holes 85 from the end face 36 and screwed into a plurality of coaxial female screw holes 11d formed in the end face of the rotating body 11a of the pressing roll or pinch roll 11. The radius of the mounting ring 83 corresponds to the radius of the protruding ring piece 35, and specifically, it is preferable that they have the same diameter.

[0104] A structure can be realized in which a rotor 65 arranged radially inward can be rotated by connecting a plurality of stationary parts of the direct drive unit 39, particularly the stationary drive housing 51, to the stator 63, and the rotation speed of the rotor 65 is reduced by the gear ratio of the subsequent gear 69. The rotating body 11a is ultimately rotated via the subsequent output shaft 71, a plurality of torque transmission devices 75 and 76 behind the output shaft 71, an attachment ring 83 which rotates integrally with the rotating body 11a of the pressing roll and the pinching roll 11.

[0105] Using a suitable controller and stationary drive housing 51, the rotational speed of the rotor 11a can be precisely set, varied and / or controlled.

[0106] As can be seen from the cross-sectional view of FIG. 10, the stationary drive housing 51 and the mounting portion 41 attached to the stationary drive housing 51 protrude from the end face 36 of the pressure roll and nip roll 11 by only a portion of their axial length.

[0107] In addition, as shown in FIG. 10, the stationary drive housing 51 axially supports and supports the multiple rotating parts of the pressing roll, the clamping roll, and the clamping roll 11 by means of rolling bearings 55 and 79 arranged spaced apart in the axial direction, thereby preventing the electric motor 64 from tilting relative to the rotating body 11a of the pressing roll and the clamping roll 11.

[0108] The same advantages according to the invention can be achieved when using a direct drive 39 as opposed to the indirect drive described in figures 2 to 6b: the length of material to be shaped, in particular a thin film, can be pressed and held against the rotating roll or drawing roll 5 in a much gentler and more controlled manner.

[0109] For example, a cleaning valve 91 (also called a cleaning or cooling air connection part) shown in Figures 9 to 12 can be suitably provided directly on the drive part 39 side to clean the inside of the rotating body 11a with a gaseous medium, for example air, when necessary.

[0110] The flush air connection 91 or flush valve connection 91 comprises a conduit arranged radially with respect to the axis of rotation or central axis 31. In the variant of Fig. 10, the conduit is connected to the interior space 59 of the drive housing 51. In the variant of Figs. 11 and 12, the conduit is connected to an elongated hole 93 arranged radially offset from the axis of rotation or central axis 31, the elongated hole 93 passing through the housing end 51b, which communicates with the interior space 59 of the drive housing 51 (which houses the rotor 65 and the stator 63) and which comprises the mounting part 41. In the following embodiments, other structures and other operations of the flush air device on the drive side will be described.

[0111] 11, in the roll support 45 (replica 42), which is preferably provided as a floating bearing, a central air hole 89 is provided, which is arranged concentrically with the axis of rotation or central axis 31 and which is connected to an outlet 88 provided at the end of the mounting part 45. By means of a cleaning medium supplied from a cleaning air connection 91 and flowing through the entire pressing roll 11, the temperature of the pressing roll 11 can, for example, be regulated and in particular cooled.

[0112] Since the shaft of the rotating body 11a (shown in the axial cross section of FIG. 11) of the pressing roll and the pinching roll 11 should not support or bear the load, the mounting part or roll mounting support 45 provided on the opposite side of the pressing roll or the pinching roll 11 is formed in a structure similar to that of the driving part 51 in terms of the load support function in terms of the axial length and the structure around the diameter, and for example, two rolling bearings including a rolling bearing or a rolling bearing pair 155 corresponding to the rolling bearing pair 55 and a different rolling bearing 179 are arranged axially apart. The mounting part 45 arranged on the outside almost functions as a dummy 42 and is preferably formed as a floating bearing. The pressing roll 11 is directly held and supported on the opposite side of the driving part 39 via the mounting part 45 and can rotate freely with respect to the non-rotating stationary dummy 42.

[0113] Fig. 12 is an axial cross-sectional view of an embodiment showing a slightly modified and enlarged driving section side of a pressing roll basically corresponding to the embodiment shown in Fig. 11. The embodiment of Fig. 12 has an advantage in particular in that the pressing roll 11 has a small roll diameter.

[0114] In the direct drive 39 shown in Figures 11 and 12, the inner rolling bearing 79 supporting the inner reaction torque is omitted. In the variant embodiment of Figure 12, in a stable gear output shaft configuration, the output shaft 71 is supported and held by a support device 75 which acts as a radial torque transmission piece. For example, the support device 75 can be formed as a coupling through which the cleaning agent flows, and, if appropriate under the specific circumstances, a stepped bearing annulus can be accommodated inside the support device 75 to hold and support the gear output shaft or rotor output shaft in engagement therewith.

[0115] The above structure allows the transmission of bending moments from the double row bearing 55 via the inner ring 62 in the area of ​​the rotor / stator arrangement, the intermediate ring 56 shown on the left side of Figures 10 to 12, and the gears with the stable gear output shaft 71.

[0116] On the opposite side, the external force is supported through the outer ring piece, i.e., the ring piece-shaped torque transmission device 77, and the external force is transmitted to the mating ring piece at the end of the roll, which can be formed as a separate enlarged step portion 77b or be part of the torque transmission device 77 as the enlarged step portion 77b.

[0117] 11 and 12 show the flush air connection 91 and its duct connection as a slot 93. FIG.

[0118] A second connection of selected design for cleaning air is provided, especially at high operating temperatures, or alternatively may be provided if recommended for reasons of available installation space.

[0119] A second circumferentially spaced radially disposed flush air connection (e.g. when space considerations preclude the other) may be provided as a design option, similar in structure, location and method of operation to the first flush air connection.

[0120] In the embodiment of Fig. 12, for example, air flows from the first cleaning air connection 91 through the long hole 93, the inner chamber 59 of the transmission motor 64 and the two holes 51c into the intermediate chamber between the gear 69 and the outer tube 77 (torque transmission device 77), and then through the support device or coupling 75 into the cavity 37 of the pressing roll 11. Although not shown, gaps and openings through which the air can escape or flow are provided in the support device or coupling 75. The method of air escape at the opposite end of the pressing roll 11 is as described above.

[0121] An electrical connection 101 for powering the electric motor 64 and transmitting electronic control data is similar to the flush air connection 91 which communicates with a slot 103 in the housing end 51 b and with the interior chamber 59 of the drive housing 51 .

[0122] 10, the air flow supplied to the cleaning air connection 91 flows, for example, through the intermediate ring 56 having passage openings into an intermediate chamber between the gear 69 and the hollow cylindrical gear housing 51 or gear housing part 51a, and further through a number of passages or holes (not shown) into the intermediate chamber between the outside of the gear housing 51 and the rotation transmission device 77. The air flows into the cavity 37 of the pressing roll 11 through a number of passages or holes 77c formed in the ring-shaped torque transmission device 77.

[0123] It should be noted that the outer surface of the outermost rotating ring-shaped rotation transmission device 77 is radially spaced from the inner surface of the hollow rotor 11a to form a gap 97 along most of the length of the rotation transmission device 77.

[0124] In the embodiment shown in FIG. 10, the electrical connection 101 , which specifically powers the electric motor 64 and carries electronic control data, is similar to the wash air connection which communicates with the interior chamber 59 of the direct drive housing 51 .

[0125] In short, the drive is provided on only one side of the rotor 11a, which preferably forms a fixed bearing, i.e. the direct drive 39. It is theoretically possible to provide corresponding drives operating synchronously, preferably on both end faces.

[0126] The direct drive unit (drive device) 39 performs not only a drive function but also a bearing function, a rotating arm connection function, and a machine base connection function.

[0127] The dimensions of the geometric spatial configuration of the floating bearing of the imitation 42 arranged opposite the illustrated single direct drive 39 are configured to be comparable to or similar to those of the direct drive 39. A cleaning air outlet may also be provided on the imitation 42 side.

[0128] Finally, it should be noted that the press roll drive used in the present invention may be used in the manufacture of a wide variety of films and film-based products, such as battery separator films and other film-based products.

Claims

1. a pressing roll (11) having a rotating body or rotating drum (11a) with an axial length (L) that forms a rolling surface (11b) for stretching the resin thin film (F) and is disposed opposite the deflection roll or molding roll (5); The rolling surface (11b) of the rotating body or rotating drum (11a) of the pressing roll (11) is at least a part of the axial length (L WKA A thin film pressing region (11c) is formed or provided between the forming roll (5) and the pressing roll device for a longitudinal stretching device, The pressing roll (11) is driven by a drive device that includes a direct drive unit (39) or an indirect drive unit or is configured with a direct drive unit (39) or an indirect drive unit; The direct drive unit (39) is rotatably connected to a ring piece (35) fixed to the rotating body or rotating drum (11a) of the pressing roll (11) or the direct drive unit (39), The direct drive unit (39) is removably attached to the ring piece (35) on at least one closing side of the pressing roll (11); A pressing roll device for a longitudinal stretching apparatus, characterized in that the direct drive unit (39) has a shaft tail (17) that protrudes beyond the end face (15) of the pressing roll (11) only over a portion of the length that is at most less than 50% of the total axial length of the pressing roll (11).

2. A stationary drive housing (51) of the direct drive part (39) arranged in the cavity (37) of the pressing roll (11) is supported by at least one rolling bearing (55) or two rolling bearings (55, 79) arranged axially spaced apart from each other with respect to the externally rotating direct drive part (39); 2. The press roll device for a longitudinal stretching apparatus according to claim 1, wherein the rolling bearing (55) provided near the closed end of the direct drive part (39) protruding from the press roll (11) is formed as a double row rolling bearing.

3. The stationary drive housing (51) includes a stationary stator (63) disposed within the stationary drive housing (51); The stationary stator (63) surrounds a rotor (65) that is rotatably disposed radially inward of the stationary stator (63), 3. The press roll device for a longitudinal stretching apparatus according to claim 2, wherein the rotor (65) is connected to a drive shaft (67) disposed at a greater distance from the end face (15) of the press roll (11).

4. 4. The pressure roll device for a longitudinal stretching device according to claim 2 or 3, wherein a gear (69) downstream of the rotor (65) provided in the drive housing (51) reduces the rotation speed.

5. The drive shaft (67) extending from the rotor (65) and / or the output shaft (71) extending from the subsequent gear (69) are a) connected directly or indirectly via radial torque transmission pieces (75) to and / or supported by a cylindrical or hollow-cylindrical torque transmission device (77); b) supported directly or indirectly through a rolling bearing (79) on a cylindrical or hollow cylindrical torque transmission device (77); 5. The press roll device for a longitudinal stretching apparatus according to claim 3, wherein the torque transmission device (77) is detachably connected to an end face (15) of the rotating body (11a) of the press roll (11).

6. The mounting portion (41) protruding outwardly and provided on the direct drive portion (39) forms a fixed bearing, The roll support (45) is provided so as to be mountable within the cavity (37) of the pressing roll (11) and protrudes from the end face (15) on the opposite side of the pressing roll (11).

6. The pressure roll device for a longitudinal stretching apparatus according to claim 1, wherein the roll supports (45) form floating bearings.

7. The mounting portion (41) protruding from the end surface (15) of the pressing roll (11) having the direct drive portion (39) is a) at least one cleaning air connection (91) for supplying a cleaning medium which is discharged at the opposite end face (15) of the pressing roll (11); b) a pressure roll device for a longitudinal stretching apparatus according to any one of claims 1 to 6, comprising at least one electrical connection (101) for supplying power and / or transmitting data to the electric motor (64).

8. a) directly or b) at least through the slots (93, 103) formed in the front housing end (51b) of the drive housing (51); The flush valve (91) and / or the electrical connection (101) of the mounting portion (41) communicates with the interior (59) of the drive housing (51) and At the opposing ends of the pressing roll (11), a roll support (45) inserted into the pressing roll (11) is provided with an air hole (89); The ventilation hole (89) has an outward opening (88) formed at an end of the mounting portion (45), 8. The press roll device for a longitudinal stretching apparatus according to claim 7, wherein the cleaning medium supplied from the cleaning valve (91) is guided through the press roll (11) and the air hole (89).

9. The drive housing (51) is a) comprising two parts: a hollow cylindrical housing part (51a) in the form of a housing ring piece (51a) and an end part (51b) in the form of a housing cover (51b) fixedly connected to the housing part (51a) to form the mounting part (41); or b) A pressing roll device for a longitudinal stretching device according to any one of claims 1 to 8, comprising a ring-shaped housing portion (51a) formed at least substantially integrally therewith, and a front housing end (51b) forming the mounting portion (41).

10. The indirect drive of the pressing roll device is a) at least one contact drive piece (27) arranged axially offset with respect to the thin film pressing area (11c) of the pressing roll (11); or b) two contact driving pieces (27) formed between the thin film pressing areas (11c) of the pressing roll (11); At least one or two contact driving pieces (27) are arranged to contact the thin film pressing area (11c) of the pressing roll (11) at least in an unloaded state. FAB ) larger than the radius (R KA ) having a diameter of 2. The pressure roll device for a longitudinal stretching device according to claim 1, wherein at least one or two contact drive pieces (27) include or are made of a material that is compressed under pressure at least in the rotating thin film pressing area (11c).

11. The compressible material of the at least one membrane pressing area (11c) is compressed under pressure and the diameter of the at least one contact drive piece (27) is a) the diameter of the thin film pressing area (11c) of the pressing roll (11) is equal to or is less than 5% larger than the diameter of the thin film pressing area (11c) of the nipping roll; or b) the diameter of the thin film pressing area (11c) of the press roll (11) is larger than the diameter of the thin film pressing area (11c) of the press roll (11) by the thickness of the resin thin film (F) guided along the thin film pressing area (11c) of the press roll (11).

12. 12. The pressure roll device for a longitudinal stretching device according to claim 10 or 11, wherein at least one or two contact drive pieces (27) have or contain rubber, a rubber-like material and / or silicon as a material that is compressed under pressure.

13. The pressing roll device includes a pressing roll (11) and at least one or two contact driving pieces (27), as well as a deflecting roll or a forming roll (5) forming a roll pair; 13. The press roll device for a longitudinal stretching apparatus according to claim 10, wherein the press roll (11) cooperating with the deflection roll or shaping roll (5) is in rolling contact or rolling contact with the rolling surface (7) and / or the roll outer shell (8) of the deflection roll or shaping roll (5) via at least one or two contact drive pieces (27), and the press roll is in rolling contact or rolling contact while forming a radial difference (33) in the thin film pressing area (11c) of the sandwiching roll and / or in the axial area provided between the contact drive pieces (27).

14. 14. The press roll device for a longitudinal stretching apparatus according to claim 13, wherein the press roll (11) adjusts the radial position of the deflection roll or shaping roll (5) while compressing the material to be compressed under pressure in the region of the contact drive piece (27) so that the thin film (F) guided between the thin film pressing region (11c) of the press roll (11) and the rolling surface (7) of the deflection roll or shaping roll (5) is brought into contact with the rolling surface (7) of the deflection roll or shaping roll (5) with a preselectable contact pressure.

15. At least one contact drive piece (27) is provided and / or formed on the ring piece (35); The press roll device for a longitudinal stretching apparatus according to any one of claims 10 to 14, wherein the ring piece (35) is rotatably fixed to the press roll (11) and / or the shaft tail (17) of the press roll (11) and attached to the end face (15) of the press roll (11).

16. At least one ring piece (35) has an outer cover (35a) of the ring piece (35) and a flange or end surface tongue piece (35d) protruding radially inward, 16. The press roll device for a longitudinal stretching apparatus according to claim 15, wherein the ring piece (35) is rotatably attached or attachable to the press roll or the nip roll (11) at an end face (15) of the press roll or the nip roll (11).

17. 17. A pressure roll device for a longitudinal stretching apparatus as claimed in claim 15 or 16, wherein a hollow cylindrical or deep pan-shaped ring piece (35) is attached to the pressure roll or the nip roll (11), and the outer cover (35a) of the ring piece (35) covers the ring piece (35) over at least a portion of its length by at least 90%.

18. The ring piece (35) is screwed to the end face (15) of the pressing roll or the pinching roll (11) by a fixing ring (36), The flange (35d) is sandwiched between the end face (15) of the pressing roll or sandwiching roll (11) and the fixed ring (36), 18. The pressure roll device for a longitudinal stretching apparatus according to claim 15, wherein the screws pass through holes in the fixing ring (36) which align with holes (35e) in the flange (35d) of the ring piece (35).

19. A stretching apparatus comprising the pressure roll device for a longitudinal stretching apparatus according to at least one of claims 1 to 18.

20. A method for changing a roll gap (34) between a pressing roll (11) and a molding roll (5) of a pressing roll device for a longitudinal stretching device according to at least one of claims 10 to 19, a) arranging a pressure roll (11) parallel to the deflection or shaping roll (5) and adjusting the position of the pressure roll (11) transversely, in particular perpendicularly, to the axis of rotation of the deflection or shaping roll (5) so that the surfaces of the two contact drive pieces (27) come into contact with the rolling surface (7) and / or the roll housing (8) of the deflection or shaping roll (5); b) increasing the compression force of the compressible material with at least one or two contact drive pieces (27) while adjusting the position of the pressure roll (11) relative to the deflection or shaping roll (5) to increase the rotational speed by frictional contact with the surface (7) and / or roll housing (8) of the deflection or shaping roll (5); c) A method for varying the pressing roll gap, characterized in that the contact force of the pressing rolling surface (11b) on the thin film (F) is generated only when the surface rotational speed of the pressing roll (11) reaches at least 50% of the speed corresponding to the surface rotational speed of the deflection or forming roll (5), thereby reducing the roll gap (34) to the thickness of the thin film (F) guided through the roll gap (34).

Images