JP4904372B2 - Metal elastic roll - Google Patents

Description

  The present invention relates to a metal elastic roll used for the production of a film or sheet made of a synthetic resin, in particular, in the production by extrusion molding of a thermoplastic resin film, while the resin material to be extruded is sandwiched between a rigid main roll and cooled. The present invention relates to a metal elastic roll suitable as a touch roll for rolling.

  In general, in the production of thermoplastic resin films and sheets by extrusion molding, a high-temperature resin material discharged from a T-die of an extrusion molding machine is sandwiched between nips of a main roll and a touch roll pressed against the main roll. Thus, the resin material is rolled to a predetermined thickness while being cooled, and further cut into a required length through a sub-cooling roll or an earthing roll as necessary, or taken up by a winding device. Conventionally, as the main roll and the touch roll, a so-called iron core in which a heat transfer liquid such as water or oil is circulated between the inner and outer cylinders in a double cylinder shape having a large outer cylinder part thickness. A highly rigid metal roll such as a roll is widely used. Moreover, the thing of the same structure is used abundantly as a subcooling roll and an earning roll.

  However, in recent years, the demand for an ultra-thin film having a thickness of 0.2 mm or less has increased. However, in the pair of a main roll and a touch roll made of a conventional high-rigidity metal roll, such an ultra-thin film is used. There was a problem that good molding quality could not be obtained when applied to. This is because the nip portion between high-rigidity metal rolls is in line contact, so in an ultra-thin film in which the discharge amount of the resin material from the T die is reduced, the mirror surface of the roll surface is not sufficiently transferred to the film, so-called Unevenness, wrinkles, cloudiness, etc. occur on the film surface as touch loss, and the surface properties and transparency are lowered. The thickness of the film changes due to slight fluctuations in the width direction and extrusion direction of the discharge amount from the T die. By deteriorating the thickness accuracy.

  Therefore, in the production of ultra-thin films by conventional extrusion molding, an air knife is used instead of the touch roll, and cooling air is blown from the side to the main roll, or the roll surface is elastically deformed as the touch roll. A method using an elastic roll which can be used is employed. And as said elastic roll, what was made to distribute | circulate a heat transfer liquid between inner and outer cylinders by the double cylinder shape where the thickness of an outer cylinder part is small contrary to the above-mentioned highly rigid metal roll (for example, , Patent Documents 1 and 2), or a sealed space formed between a shaft body of a roll core shaft and a thin metal pipe fitted on the shaft body, and a small amount of viscous fluid and gas at atmospheric pressure or higher enclosed (Patent Document 3) and the like are known.

JP 2002-36333 A JP 2008-290310 A Japanese Patent No. 3835583

  However, in the method using the conventional air knife, since the film surface on the air knife side that does not contact the main roll surface is uneven, the surface smoothness and transparency are inferior, and the thickness is also 0.2 mm or less. As a very thin film, a high quality film cannot be obtained.

  On the other hand, when an elastic roll is used, the mirror surface of the roll surface can be reliably transferred to the film by elastic deformation of the roll surface so that the nip portion with the main roll is in surface contact. Can be greatly improved. However, in the conventional elastic roll in which the heat medium liquid is circulated between the inner and outer cylinders in the conventional double cylinder shape, the temperature distribution and pressure distribution of the heat medium liquid circulated between the inner and outer cylinders during molding are uniform throughout the roll. The thickness of the film is likely to change partially due to the difference in hardness of the resin material due to the difference in the degree of cooling and the difference in pinching pressure due to the difference in the degree of deflection of the roll surface, especially like an optical film It was difficult to obtain a sufficiently satisfactory quality as an ultra-thin film that requires a high degree of thickness accuracy. An elastic roll in which a viscous fluid and a gas are sealed in a sealed space between the shaft body of the roll core shaft and the thin metal pipe has a cooling function for the resin material even if the pressure distribution on the roll surface can be equalized. There is a fatal problem that the temperature cannot be adjusted for molding. Furthermore, these conventional elastic rolls have a drawback in that the elastic deformation of the roll surface is constant, so that it is impossible to cope with differences in the type of resin material to be molded, film thickness, molding speed, and the like.

  In view of the circumstances described above, the present invention provides a metal elastic roll that is excellent in elastic deformability of the roll surface and has a good temperature control function by a heat medium liquid that circulates inside, and a temperature distribution of the heat medium liquid and The pressure distribution is uniform over the entire roll, and in particular, it is possible to provide a touch roll that can be brought into contact with a rigid main roll in extrusion molding of an ultra-thin film having a thickness of 0.2 mm or less, and that can achieve extremely high film quality. The second object is to provide one that can cope with differences in the type of resin material to be molded, film thickness, molding speed, and the like.

If the means for achieving the above object is shown with reference numerals in the drawings, the metal elastic roll Rs according to the invention of claim 1 is a metal having pivot portions 11 and 12 that are coaxially projected at both ends. A roll core shaft 1, a thin metal pipe 2 fitted on the outside of the roll core shaft 1, and sealing fixing for fixing the thin metal pipe 2 to the roll core shaft 1 at both ends in a liquid-tight seal state. Means 3 and heat medium liquid supply means 4;
A plurality of groove-like flow paths 5 continuous from one end side to the other end side are formed on the entire outer peripheral surface of the main body portion 10 of the roll core shaft 1.
On one end side of the roll core shaft 1, an introduction flow path 6 is formed from the introduction port 60 opened at the tip of one pivot portion 11 to one end side of the groove-shaped flow path 5.
On the other end side of the roll core shaft 1, a lead-out flow path 7 is formed from the other end side of the groove-shaped flow path 5 to the lead-out port 70 opened at the tip of the other pivot portion 12.
The thin metal pipe 2 has an inner diameter that forms a gap g between its inner peripheral surface and the top end of the partition wall 13 that separates the adjacent groove-like flow paths 5 and 5 of the roll core shaft 1. It can be bent and elastically deformed within the gap g,
The heat medium liquid L supplied to the introduction port 60 from the heat medium liquid supply means flows into the groove-like flow path 5 through the introduction flow path 6, and the outer peripheral surface of the thin metal pipe 2 and the metal roll core shaft 1. It is configured to be discharged from the outlet 70 through the outlet channel 7 in a state where the entire space 8 including the gap g between the side and the side is filled.

  According to a second aspect of the present invention, in the metal elastic roll Rs according to the first aspect, the sealing and fixing means 3 is detachably screwed to the end of the roll core shaft 1 in a state of being externally fitted to the end of the thin metal pipe 2. The metal ring member 31 is fixed and the seal ring 32 is interposed between the end of the thin metal pipe 2 and the roll core shaft 1.

  According to a third aspect of the present invention, in the metal elastic roll Rs according to the first or second aspect, the plurality of groove-like flow paths 5 are each a multi-spiral groove in which each groove independently surrounds the outer periphery of the roll core shaft 1. It consists of.

  According to a fourth aspect of the present invention, in the metal elastic roll Rs according to any one of the first to third aspects, the introduction flow path 6 includes a central flow path 61 formed from the introduction port 60 along the roll axis, The central flow path 61 is composed of a plurality of branch flow paths 62 that radially diverge from the inner back side to the roll outer peripheral side corresponding to each groove-shaped flow path.

According to the fifth aspect of the present invention, in the metal elastic roll Rs according to any one of the first to fourth aspects, the outlet side pressure of the heat transfer liquid L is reduced by reducing the flow path on the downstream side of the outlet 70. It is set as the structure set larger than.

  The invention according to claim 6 is the metal elastic roll Rs according to any one of claims 1 to 5, wherein the thin metal pipe 2 is a seamless pipe having a thickness of 0.2 to 1.0 mm, and the gap g is 0. It is set as the structure set to the range of 2-2.0 mm.

  Next, effects of the present invention will be described with reference numerals in the drawings. First, in the metal elastic roll Rs according to the invention of claim 1, the nip portion is brought into surface contact by the elastic deformation of the thin metal pipe 2 fitted on the outer side of the roll core shaft 1 when pressed against the rigid roll. The heat transfer fluid L flowing between the thin metal pipe 2 and the outer periphery of the roll core shaft 1 exhibits a good cooling and temperature adjusting action. Thus, the heat transfer fluid L is equally distributed to the plurality of groove-like flow paths 5 provided on the entire outer peripheral surface of the roll core shaft 1, so that the temperature distribution as a whole roll becomes uniform. The pressure distribution of the heat transfer fluid L is also uniform over the entire roll. Therefore, in the production by extrusion molding of a thermoplastic resin film, when the metal elastic roll Rs is used as a touch roll for rolling while pressing and cooling the extruded resin material with a high-rigidity main roll Rh The elastic deformation of the roll surface makes the nip with the main roll Rh a surface contact so that the mirror surface of the roll surface can be transferred reliably to the film, and the heat of the resin material is efficiently exchanged with the heat transfer fluid. The film temperature can be maintained at a constant level, so that excellent surface properties and transparency can be obtained even with an ultra-thin film with a thickness of 0.2 mm or less, and the degree of cooling can be improved by the uniform temperature distribution and pressure distribution of the circulating heat transfer fluid. The difference in the hardness of the resin material due to the difference in the thickness and the difference in the pinching pressure due to the difference in the degree of deflection of the roll surface does not occur, so that a very high thickness accuracy can be achieved. Uni can give sufficiently satisfactory quality as high ultrathin film thickness precision is required.

  According to the invention of claim 2, the thin metal pipe 2 can be easily detached from the roll core shaft 1 by removing the metal ring material 31 for attaching the sealing and fixing means 3 from the roll core shaft 1. Therefore, in the production of the thermoplastic resin film by extrusion molding, etc., the thin metal pipe 2 is made to have a different thickness according to the difference in properties depending on the resin type of the resin material, the change of the film thickness or molding speed, etc. Therefore, it is possible to appropriately set the elastic deformability of the roll surface to obtain high film quality, and it is possible to easily replace the thin metal pipe 2 with a new one even when the thin metal pipe 2 is damaged.

  According to the invention of claim 3, since the plurality of groove-like flow paths 5 are composed of multiple spiral grooves, there is no difference in the inner structure due to the circumferential position of the roll surface, and the exact same temperature / Since pressure conditions are met, adverse effects on film quality due to differences in temperature and pressure conditions due to circumferential positions can be completely eliminated.

  According to the invention of claim 4, the heat transfer fluid L supplied from the introduction port 60 passes through the central flow path 61 along the roll axis and individually from each of the radial branch flow paths 62 to each groove-shaped flow path 5. Since the inflow shape is obtained, it is possible to reliably avoid the deviation of the temperature distribution and the pressure distribution of the heat transfer fluid L at the previous stage of the flow into the groove-like flow path 5.

  According to the fifth aspect of the present invention, since the pressure on the outlet side of the heat transfer fluid L is larger than the pressure on the inlet side, the pressure difference acts as the internal pressure of the thin metal pipe 2 and the elasticity as an elastic roll increases.

  According to the invention of claim 6, the thin metal pipe 2 is a seamless pipe having a specific thickness, and the gap g between the inner peripheral surface of the thin metal pipe 2 and the top end of the partition wall portion 13 between the groove-like channels 5 and 5 of the roll core shaft 1. Is in a specific range, excellent elastic deformability of the roll surface is ensured, and the nip portion with the high-rigidity main roll Rh is set to an optimum surface contact state in the film forming and is seamless. High film quality can be achieved by mirror surface transfer of the seamless pipe, and distortion due to excessive deformation of the thin metal pipe 2 can be prevented.

The metal elastic roll which concerns on one Embodiment of this invention is shown, (A) is a partially broken front view, (B) is a cross-sectional arrow XX line of (A). FIG. 2 is an enlarged view in a virtual line circle Y of FIG. 1. It is a vertical front view of the one end side principal part of the metal elastic roll. It is a schematic diagram of the film forming apparatus using the metal elastic roll. It is a vertical side view which shows the contact condition of the metal elastic roll and main roll in the film forming apparatus.

  Embodiments of a metal elastic roll according to the present invention will be specifically described below with reference to the drawings. As shown in FIGS. 1 (A) and 1 (B), this metal elastic roll Rs is a metal roll such as steel in which pivot portions 11 and 12 are coaxially provided at both ends of a substantially round shaft-shaped main body portion 10. A core shaft 1, a thin metal pipe 2 fitted over the outside of the roll core shaft 1, and a sealing fixing means 3 for fixing the thin metal pipe 2 to the roll core shaft 1 at both ends in a liquid-tight sealed state. And a heat medium liquid supply means 4.

  In the roll core shaft 1, a plurality of (16 in the figure) spiral groove-like flow paths 5 that are continuous from one end side to the other end side are formed on the entire outer peripheral surface of the main body portion 10. These groove-like flow paths 5 constitute a multiple spiral groove that spirals around the outer periphery of the roll core shaft 1 independently of each other.

  Further, on one end side of the roll core shaft 1, there is a central channel 61 formed along the roll axis from an introduction port 60 opened at the tip of one pivot portion 11, and an inner depth of the central channel 61. An introduction flow path 6 is formed, which is composed of a plurality of branch flow paths 62 that diverge radially from the circumferential direction to each one and communicate with one end of each groove-shaped flow path 5. Further, on the other end side of the roll core shaft 1, a central flow path 71 formed along the roll axis from a lead-out port 70 opened at the tip of the other pivotal portion 12, and the central flow path 71 A lead-out flow path 7 is formed which includes a plurality of merge flow paths 72 that diverge radially from the inner depth to the circumferential direction and each communicate with the other end of each groove-shaped flow path 5. In addition, since the both ends of the roll core shaft 1 have a symmetrical structure, the introduction flow path 6 and the discharge flow path 7 have the same flow path configuration.

  The thin metal pipe 2 is a seamless pipe made of general steel or stainless steel, and the inner diameter thereof is slightly larger than the outer diameter of the main body 10 of the roll core shaft 1. As a result, as shown in an enlarged view in FIG. 2, the partition wall 13 separating the inner peripheral surface of the thin metal pipe 2 and the adjacent groove-like flow paths 5 and 5 in the main body 10 of the roll core shaft 1. A gap g is formed between the top end. Here, the thickness t of the thin metal pipe 2 is not particularly limited, but is preferably in the range of 0.2 to 1.0 mm. If it is too thin, the strength is insufficient. The elastic deformation of the surface will be insufficient. The gap g is not particularly limited, but is preferably in the range of 0.2 to 2.0 mm. If it is too small, the elastic deformation of the roll surface is hindered. 2 excessive deformation (plastic deformation) cannot be prevented. The appropriate range of the groove-like channel 5 varies depending on the roll diameter, but when the roll diameter is about 100 to 400 mm, the width w and the depth d are generally set to about 5 to 50 mm.

  The sealing fixing means 3 at both ends of the roll includes a mounting metal ring member 31 that is detachably screwed to the end of the roll core shaft 1 in a state of being fitted around the end of the thin metal pipe 2, and the thin wall A seal ring 32 made of an elastic polymer material such as rubber is interposed between the end of the metal pipe 2 and the roll core shaft 1.

  As shown in detail in FIG. 3, the mounting metal ring member 31 has a radial cross-section of an end wall portion 31a, an outer peripheral wall portion 31b, and an inner peripheral wall portion 31c narrower than the outer peripheral wall portion 31b. It is substantially F-shaped and includes an annular groove 31d between the peripheral wall portions 31b and 31c. The end wall is inserted into the annular groove 31d with the end portion of the thin metal pipe 2 inserted therein and the inner portion is fitted into the annular step portion 14 provided at the end portion of the main body portion 10 of the roll core shaft 1. The part 31a is detachably attached to the roll core shaft 1 via fastening bolts 33 at a plurality of locations in the circumferential direction.

  In addition, the seal ring 32 is fitted to the annular step portion 14 of the main body portion 10 of the roll core shaft 1, and is tightened with the tightening bolt 33 to thereby end the end surface of the inner peripheral wall portion 31 c of the mounting metal ring material 31. And the annular projecting edge portion 15 of the main body portion 10 of the roll core shaft 1, bulging and deforming outward, and press-contacting to the inner surface side of the end portion of the thin metal pipe 2. A liquid-tight seal is formed between the end portion and the roll core shaft 1. An O-ring 34 is also interposed between the outer peripheral wall portion 31 b of the mounting metal ring material 31 and the outer peripheral surface of the thin metal pipe 2.

The heat medium liquid supply means 4 continuously feeds the heat medium liquid L made of oil or water set to a predetermined temperature into the inlet 60 of the roll core shaft 1 at a constant flow rate via a pump (not shown). It has become. The heat transfer fluid L sent to the introduction port 60 passes through the central flow path 71 of the introduction flow path 6 and is divided into a plurality of branch flow paths 72 from the inner part thereof, and each groove flow flows from each branch flow path 72. The confluence channel 72 of the outlet channel 7 flows into the channel 5 and fills the entire space 8 including the gap g between the inner peripheral surface of the thin metal pipe 2 and the outer peripheral side of the metal roll core shaft 1. And it is discharged out of the system through the outlet 70 through the central flow path 71. Thus, the heat medium liquid L is set so that the outlet side pressure becomes larger than the inlet side pressure by restricting the flow path (not shown) on the downstream side of the outlet 70, and the pressure difference is set in the space 8. Acts as an internal pressure to increase the elasticity of the elastic roll Rs. The pressure difference between the outlet side and the inlet side is not particularly limited, but is usually set to about 1 to 5 kg / cm ² .

  In the metal elastic roll Rs having the above-described configuration, the nip portion is brought into surface contact by elastic deformation of the thin metal pipe 2 when pressed against the rigid roll, and between the thin metal pipe 2 and the outer periphery of the roll core shaft 1. A good cooling and temperature adjusting action can be exhibited by the heat transfer fluid L flowing through the. Therefore, for example, when the metal elastic roll Rs is used as a touch roll in contact with the high-rigidity main roll Rh in extrusion molding of a thermoplastic resin film as in the film forming apparatus shown in FIG. 4, the metal elastic roll Rs Is pressed against the main roll Rh with a predetermined load, and the resin material M discharged from the T die D of the melt extruder E is pressed between the rolls Rs and Rh, whereby the roll of the metal elastic roll Rs as shown in FIG. The surface of the roll Rs, Rh is surely transferred to the film F, and the heat of the resin material F exchanges heat with the low-temperature heat transfer fluid L while the surface is deformed elastically so that the surface is recessed. It is efficiently discharged and the film temperature is kept constant. Therefore, even if the film F to be molded is an extremely thin film having a thickness of 0.2 mm or less, excellent surface properties and transparency can be obtained.

  In addition, according to the metal elastic roll Rs, the groove-like flow path 5 is formed on the entire outer periphery of the roll core shaft 1, so that the circulating heat transfer fluid L has a uniform temperature distribution and pressure distribution as the entire roll. Therefore, the difference in hardness of the resin material M due to the difference in the degree of cooling and the difference in pinching pressure due to the difference in the degree of deflection of the roll surface does not occur, and as a result, extremely high thickness accuracy can be achieved, especially like an optical film It is possible to provide a sufficiently satisfactory quality as an ultra-thin film that requires a high degree of thickness accuracy.

  That is, in this metal elastic roll Rs, the space 8 between the main body part 10 of the roll core shaft 1 and the thin metal pipe 2 is communicated with the gap g, but the flow of the heat transfer liquid L is a groove. Therefore, the flow of the heat transfer liquid L is not easily biased as a whole roll, and the thin metal pipe 2 is deformed when it is elastically deformed at the nip portion with the main roll Rh. Along with this, the excess heat medium liquid L in the inner space is rapidly discharged to the outlet channel 7 side in a form that increases the flow velocity of the groove-like channel 5 facing the deformation position. Therefore, the amount of heat transferred to the heat transfer fluid L due to heat exchange with the high temperature resin material M at the nip is immediately discharged out of the system without staying around the deformation position, so that a uniform temperature distribution is maintained throughout the roll. At the same time, the increase in internal pressure at the deformed position is immediately eliminated by the increase in the amount of discharged liquid from the groove-like flow path 5 facing the deformed position, so that a uniform pressure distribution is maintained for the entire roll.

  On the other hand, in the metal elastic roll in which the space between the main body portion 10 of the roll core shaft 1 and the thin metal pipe 2 is a simple annular space, the flow of the heat transfer liquid L is induced like the groove-like flow path 5. Since there is no functional part, the flow of the heat transfer liquid L tends to be biased as a whole from the beginning, and when the thin metal pipe 2 is elastically deformed so as to be recessed at the nip part with the main roll Rh, the deformed part The heat transfer fluid L inside is moved to both sides in the circumferential direction by the amount of space reduction. However, since the temperature of the moved heat medium liquid L is increased by heat exchange at the nip portion, the amount of heat transferred from the resin material M to the heat medium liquid L is biased around the deformation position and affected by the flow. The temperature distribution of the entire roll becomes non-uniform, and the temperature of the heat transfer fluid L in the deformed portion that is displaced in the circumferential direction by the rotation of the roll is always higher than that during supply. The heat exchange efficiency is also lowered, and the cooling of the film F is difficult to proceed. Further, as the heat transfer fluid L moves from the deformation position to both sides in the circumferential direction, the internal pressure on both sides in the circumferential direction increases, so that the pressure distribution as a whole roll becomes non-uniform.

  The pressing force of the metal elastic roll Rs with respect to the main roll Rh can be arbitrarily set by adjusting the inter-axis distance by the cotter advance / retreat operation that is generally interposed between the bearing portions of both the rolls Rh, Rs. Although there is no restriction | limiting in particular as the pressing degree, Usually, what is necessary is just to set so that the surface contact length n (refer FIG. 5) of the metal elastic roll Rs in a nip part may be set to about 2-5 mm.

  By the way, in the configuration in which the heat transfer fluid L is circulated throughout the inner periphery of the roll as described above, the flow of the heat transfer fluid L is introduced before operation in order to strictly set and maintain the pressing force against the main roll Rh. It is necessary to exhaust the air completely. However, in the metal elastic roll in which the space between the main body 10 of the roll core shaft 1 and the thin metal pipe 2 is a simple annular space, even if the heat transfer liquid L is introduced, light air escapes from the liquid flow and is horizontally disposed. The air pressure layer tends to remain on the upper side of the roll, the pressing force is deviated from the set value by the air layer, and the pressing force often fluctuates due to a volume change due to compression of the air layer. On the other hand, in the configuration having the groove-like flow path 5 on the peripheral surface of the main body portion 10 of the roll core shaft 1 like the metal elastic roll Rs, when the heat transfer liquid L is introduced, the groove is formed on the upper side in the roll. Since the air is entrained in the liquid flow along the flow path 5 and is easily discharged, the space 8 between the main body 10 of the roll core shaft 1 and the thin metal pipe 2 is completely only the heat transfer liquid L. Thus, the pressing force against the main roll Rh can be maintained stably as a strictly set value, and a high-quality film F with a constant thickness can be continuously produced.

  On the other hand, there are many types of resin materials to which extrusion molding of the above-mentioned thermoplastic resin film is applied. Depending on the type, there are differences in properties such as spreadability in the melted / softened state, and even the same resin material is a film product. In many cases, different thicknesses are required, and in some cases, it is necessary to change the molding speed in relation to the melt extrusion conditions and subsequent processes. The properties of these resin materials, film thickness, molding speed, etc. Due to the difference, the elastic deformability of the roll surface necessary for obtaining an appropriate surface contact state as the elastic roll is different. However, in the conventional elastic roll specification of the inner and outer double cylinders, since the elastic deformation of the roll is constant, only a film with a certain thickness can be formed under the same molding conditions for a single resin material, and for each film product. A dedicated elastic roll is required, and the entire roll must be replaced due to damage to the outer cylinder.

  On the other hand, in this metal elastic roll Rs, the thin metal pipe 2 is easily detached from the roll core shaft 1 by detaching the metal ring material 31 for attaching the sealing and fixing means 3 from the roll core shaft 1. Since it can be exchanged, by replacing the thin metal pipe 2 with a suitable thickness according to the difference in properties depending on the resin type of the resin material, changes in film thickness, molding speed, etc., various film products In addition, the thin metal pipe 2 can be easily replaced with a new one even when the thin metal pipe 2 is damaged, and the equipment cost can be greatly reduced as compared with the conventional case.

  In the film forming apparatus shown in FIG. 4, the metal elastic roll Rs of the touch roll on the upper side and the sub cooling roll Rc on the same side can be separated from the main roll Rh having high rigidity via the air cylinders C1 and C2. The resin material M discharged from the T-die D of the melt extruder E is supplied from the side to the nip portion between the metal elastic roll Rs and the main roll Rh that are vertically contacted with each other. The Then, the film F rolled while being cooled while passing between both rolls Rs and Rh is further cooled by passing between the main roll Rh and the sub-cooling roll Rc, and is cut through the guide rolls G1 and G2. And is sent to subsequent processes such as winding. Although not shown, the main roll Rh and the sub cooling roll Rc are made of a general high-rigidity metal roll having a thick double cylinder structure on the outer cylinder side, and a heat transfer liquid between the inner and outer cylinders. Is now in circulation.

  The metal elastic roll Rs according to the present invention includes a plurality of groove-like channels 5 provided on the outer periphery of the main body portion 10 of the roll core shaft 1 in a linear shape along the roll longitudinal direction. However, if the plurality of groove-like flow paths 5 are multi-spiral grooves as in the embodiment, there is no difference in the inner structure depending on the circumferential position of the roll surface, and exactly the same temperature and pressure conditions over the entire circumference of the roll surface. Therefore, there is an advantage that the adverse effect on the film quality due to the difference in temperature and pressure conditions depending on the circumferential position can be completely eliminated. Thus, the number of the groove-like flow paths 5 is variously set according to the roll diameter, but is generally in the range of 8 to 24.

  Moreover, in this invention, it replaces with the radial distribution flow path 62 corresponding to each groove-shaped flow path 5 as the said embodiment as the introduction flow path 6 of the one end side of the roll core axis 1, and the main body of the roll core axis | shaft 1 An annular groove communicating with one end side of all the groove-like flow paths 5 and a plurality of radial communication holes extending from the inner back of the central flow path 61 to the annular groove may be provided on the outer periphery of the end portion of the portion 10. Good. However, in the configuration in which the radial distribution flow path 62 is provided as in the above-described embodiment, the supplied heat transfer liquid L flows into each grooved flow path 5 from each of the branch flow paths 62 individually. There is an advantage that the deviation of the temperature distribution and the pressure distribution of the heat transfer liquid L in the previous stage of flowing into the groove-like flow path 5 can be reliably avoided.

  Further, in the present invention, various sealing and fixing methods other than those exemplified in the embodiment can be adopted as the sealing and fixing means 3 at both ends of the roll. However, as in the above-described embodiment, the mounting metal ring member 31 that is detachably screwed to the end of the roll core shaft 1 in a state of being fitted to the end of the thin metal pipe 2, and the thin metal pipe 2 As described above, the thin metal pipe 2 can be replaced with one having a different thickness or a new one due to damage. There is an advantage that it can be easily exchanged. In this case, the mounting metal ring material 31 and the seal ring 32 may have various cross-sectional shapes other than those illustrated, and a plurality of seal rings 32 may be combined.

  The metal elastic roll Rs of the present invention is not limited to the vertical and horizontal three roll type film forming apparatus illustrated in FIG. 4, but is a vertical type or horizontal three type film, or a four type film including a backup roll. In addition to being applicable to a molding apparatus, it can be used as an elastic roll with a temperature adjusting function in contact rolls for various uses including calendar molding. Further, the temperature adjusting function by the liquid metal elastic roll Rs can be used when the heating medium liquid L is heated to a temperature higher than that of the object to be molded, contrary to the exemplified cooling action. Further, the size of the liquid metal elastic roll Rs is not particularly limited, but a roll diameter of 100 to 400 mm and a roll length of about 300 to 1000 mm are preferable.

DESCRIPTION OF SYMBOLS 1 Roll core shaft 10 Main-body part 11,12 Pivot part 13 Partition part 2 Thin metal pipe 3 Sealing fixing means 31 Ring material for attachment 32 Seal ring 4 Heat transfer liquid supply means 5 Grooved flow path 5
6 Introduction Channel 60 Introduction Port 61 Central Channel 62 Distribution Channel 7 Outlet Channel 70 Outlet 8 Space L Heat Transfer Fluid Rs Metal Elastic Roll g Gap t Thin Metal Pipe Thickness

Claims (6)

A metal roll core shaft having a pivot portion protruding coaxially at both ends, a thin metal pipe fitted over the outside of the roll core shaft, and the thin metal pipe at both ends with respect to the roll core shaft A sealing and fixing means for fixing in a liquid-tight sealing state, and a heat medium liquid supply means,
A plurality of groove-shaped channels that are continuous from one end side to the other end side are formed on the entire outer peripheral surface of the main body portion of the roll core shaft,
On one end side of the roll core shaft, an introduction channel is formed from an inlet opening at the tip of one of the pivot portions to one end side of the groove-shaped channel,
On the other end side of the roll core shaft, a lead-out flow path is formed from the other end side of the groove-shaped flow path to a lead-out opening opened at the tip of the other pivot part,
The thin metal pipe has an inner diameter that forms a gap between the inner peripheral surface thereof and the top end of the partition wall that separates the adjacent groove-like flow paths of the roll core shaft, and is bent within the range of the gap. Elastically deformable,
The heat medium liquid supplied from the heat medium liquid supply means to the introduction port flows into the groove-shaped flow path through the introduction flow path, and the inner peripheral surface of the thin metal pipe and the outer peripheral side of the metal roll core shaft. A metal elastic roll configured to be discharged from the outlet through the outlet channel in a state where the entire space including the gap is filled.   The sealing and fixing means includes a mounting metal ring member that is detachably screwed to the end of the roll core shaft in a state of being fitted to the end of the thin metal pipe, and the end of the thin metal pipe and the roll core. The metal elastic roll of Claim 1 comprised by the seal ring interposed between shafts.   3. The metal elastic roll according to claim 1, wherein each of the plurality of groove-shaped flow paths includes a multi-spiral groove in which each groove independently spirals around the outer periphery of the roll core shaft.   The introduction flow path diverges radially from the inner opening side of the center flow path to the outer peripheral side of the roll corresponding to each groove-shaped flow path from the introduction opening along the roll axis. The metal elastic roll according to any one of claims 1 to 3, comprising a plurality of branched flow paths. The metal elastic roll according to any one of claims 1 to 4 , wherein the outlet side pressure of the heat transfer fluid is set to be larger than the inlet side pressure by narrowing the flow path on the downstream side of the outlet port .   The metal according to claim 1, wherein the thin metal pipe is a seamless pipe having a thickness of 0.2 to 1.0 mm, and the gap is set in a range of 0.2 to 2.0 mm. Elastic roll.

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