JP2008114981A - Breathable roll for conveying molten resin sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a breathable roll used for conveying a molten resin sheet, capable of easily replacing breathable material on a roll surface, equalizing tension of the breathable material in respective parts on a breathable roll surface, reducing cooling and stably conveying without bubble traces and wrinkles on the molten resin sheet. <P>SOLUTION: The breathable roll for conveying molten resin sheet is provided with a drive roll, a suction cylinder which is structured so as to cover a roll surface of the drive roll, and fit in the drive roll, includes many vacuum suction holes arranged on a surface, and is divided so as to be opened from a roll shaft in a radiation direction, plate like cylinder dividing members having a tapered part interposed between the respective suction cylinders, a breathable cylinder provided on a cylinder surface of the suction cylinder, and a cylinder dividing member moving means structured so as to press the cylinder dividing member in an axial direction of the cylinder between the divided suction cylinders. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a breathable roll used for conveying a molten resin sheet, and in particular, the breathable material on the surface of the roll can be easily replaced, the tension of the breathable material on each part of the breathable roll surface is made uniform, and the molten resin The present invention relates to a breathable roll that can be stably conveyed with less cooling and without bubble marks or wrinkles in the sheet.

  In some cases, the molten resin sheet is desired to be joined to other sheets using its heat as it is. In some cases, a molten sheet extruded from a die or the like or an already formed sheet is heated and melted, and transferred and conveyed in a molten state. When the molten resin sheet comes into contact with the metal roll, heat is taken away, and air bubbles are entrapped on the side in contact with the metal surface, and air bubble marks and wrinkles are easily generated. Further, there is a problem that the sheet is deformed due to sticking when it is separated from the metal roll. Therefore, the use of mesh rolls with a mesh surface was studied, but mesh rolls are practically used with a stable outer diameter because the mesh material is easily deformed mechanically and also by thermal strain. There was nothing to serve.

  Breathable rolls used for molten resins tend to get dirty of breathable materials and need to be replaced frequently. In many cases, it is mechanically damaged by dropping a bolt. Therefore, a breathable roll that can easily replace the breathable material on the surface of the breathable roll has been desired.

  The air-permeable roll needs to be stretched uniformly in tension as a whole, and is also difficult to handle because it tends to become uneven due to thermal strain. Further, when the molten resin sheet comes into contact with the air permeable roll, it is necessary to suck the sheet from the inside of the roll so that the molten resin sheet is not wound up by the air inside the air permeable cylinder. For this purpose, it has been demanded that the tension of the breathable material of the breathable roll can be adjusted according to the temperature or the like. A conventional air-permeable roll (for example, JP-A-2003-94467) has no mechanism for finely adjusting such tension. Moreover, although there exists a thing using a planar mesh as a conveyance means of such a molten sheet using a mesh (Unexamined-Japanese-Patent No. 1-306227), the apparatus became complicated and adjustment of the tension of the mesh was not easy. .

  The tension of the breathable material on the surface of the breathable roll may be partially different on the circumference, and a method of adjusting the tension for each part has been desired. Further, the tension may be different at both ends of the roll, and it is desirable that the difference be finely adjusted. Even if the air-permeable roll has a uniform tension, the molten sheet needs to be firmly fixed on this roll. A means for sucking is taken (for example, JP-A-2003-94467). However, if the entire surface of the roll is sucked with negative pressure, suction at a portion where the sheet is not in contact is wasted. Thus, a means for fixing the sheet on the roll by suctioning only the part of the sheet on the air-permeable roll which is in contact with the negative pressure has been desired.

  As a cushioning material or cushioning sheet for packaging, a large amount of plastic bubble sheets are used, in which a number of depressions are formed in the plastic film and the bottom surface is joined with another plastic film to form a number of sealed bubble protrusions. ing. Many plastic foam sheet forming apparatuses have been proposed (for example, Japanese Patent Publication No. 3-74616), but a molten resin sheet needs to be guided to the forming apparatus. At that time, there has been a demand for a guide roll that does not excessively cool the molten resin sheet, does not cause distortion due to non-uniform cooling, and can be stably guided without wrinkles.

JP2003-94467 (page 2-3, FIG. 2) JP-A-1-306227 (page 1-2, FIG. 1) Japanese Patent Publication No. 3-74616 (page 1-2, Fig. 1)

  An object of the present invention is to solve the problems of the conventional breathable rolls described above, and is used for conveying a molten resin sheet, and has a mechanism for preventing bubble marks and wrinkles from entering the sheet. Is presented. Another object of the present invention is to provide a mechanism for firmly holding the sheet so that the sheet is not wound up by the air inside the mesh when it comes into contact with the breathable roll. A further object of the present invention is to provide a breathable roll that can easily peel the sheet from the roll.

  Another object of the present invention is to provide a breathable roll that facilitates replacement of the breathable material on the roll surface. Another object of the present invention is to provide a means for making the stretch of the breathable material on the roll surface uniform. Another object of the present invention is to provide means for adjusting the tension of the breathable material at both ends of the breathable roll. Another object of the present invention is to provide a breathable roll that can finely adjust the tension of the breathable material in the breathable cylinder in accordance with the material and temperature of the breathable material. It is a further object of the present invention to provide a breathable roll with good suction efficiency by sucking only the portion of the breathable roll that contacts the sheet with negative pressure and not sucking unnecessary portions.

  Another object of the present invention is to provide a guide roll for stably guiding a molten sheet to a plastic foam sheet forming apparatus.

  This invention was made | formed in order to achieve the said objective, Comprising: The air permeability roll for molten resin sheet conveyance of this invention has the following characteristics. The present invention comprises (a) a drive roll, (b) a roll surface of the drive roll, and is configured to fit with the drive roll, and a number of vacuum suction holes are arranged on the surface, and the drive roll shaft And (c) a plate-like taper that tapers in the radial direction of the suction cylinder. A cylindrical dividing member having a form, (d) a breathable cylinder provided so as to cover the cylindrical surface of the suction cylinder, and (e) a cylindrical dividing member being pushed between the divided suction cylinders The present invention relates to a breathable roll for conveying a molten resin sheet, comprising a configured cylindrical dividing member moving means. According to the present invention, (a) a plurality of axial holes which are air passages arranged in the axial direction of the suction cylinder corresponding to the vacuum suction holes, and (b) suction. A fixed side that is provided in contact with a part of the circumference of the cylinder at the end of the cylinder, and is configured to guide an axial hole in a part of the cylinder to a vacuum source and to suck the axial hole under a negative pressure. And a breathable roll for conveying a molten resin sheet. According to the present invention, the roll diameter of the drive roll is tapered in the axial direction of the roll, and the inner diameter of the suction cylinder disposed so as to be fitted to the drive roll is the taper direction of the drive roll. It is related with the breathable roll for molten resin sheet conveyance comprised so that it might fit with a drive roll by making the taper contrary to. Further, the present invention has a flange on the end plate surface side of the suction cylinder, a nut that is fitted to a screw at an end of the drive roll is tightened, and the cylindrical dividing member is moved in the axial direction of the cylinder by pressing the flange. It is related with the breathable roll for conveyance of the molten resin sheet which consists of the said cylindrical division member moving means comprised so that it might be pushed in and the diameter of a breathable roll may expandly change, and a breathable cylinder may be in a tension | tensile_strength state. According to the present invention, the suction cylinder has a flange on the side of the end plate surface, and the flange is supported on the suction cylinder by a plurality of bolts. By adjusting each bolt with a nut, the cylindrical divided member is flanged. It is related with the air permeability roll for molten resin sheet conveyance which consists of the said cylindrical division member moving means comprised so that it could be pushed in by and can change the diameter of a suction cylinder partially. The present invention also has a flange on the end plate surface side of the suction cylinder, presses a bolt embedded in the flange against the side surface of the cylindrical divided member, and sucks the cylindrical divided member by being pushed between the suction cylinders. The present invention relates to an air-permeable roll for conveying a molten resin sheet, which is configured to be able to partially change the diameter of a cylinder, and includes the cylinder dividing member moving means. Further, the present invention has a flange on the end plate surface side of the suction cylinder, the flange is fixed to the drive roll, and the cylindrical dividing member and the flange are connected by a screw, and the cylindrical dividing member is connected by a screw. It is related with the breathable roll for conveyance of the molten resin sheet which consists of the said cylindrical division member moving means comprised so that the diameter of a suction cylinder could be partially changed by moving to the radial direction outer side of a suction cylinder. Further, the present invention has a flange on the end plate surface side of the suction cylinder, the flange and the cylindrical dividing member are in contact with each other at an oblique surface, and a plurality of flanges are pushed into the axial center of the drive cylindrical shaft. The present invention relates to a breathable roll for conveying a molten resin sheet comprising the cylindrical dividing member moving means, which is configured to change the diameter of the suction cylinder by moving the cylindrical dividing member to the outside in the radial direction of the suction cylinder. Further, the present invention includes at least two cylindrical dividing members disposed at both ends of the drive roll and having different cylindrical taper directions of the cylindrical dividing members, and the cylindrical dividing member moving means at both ends respectively. The present invention relates to a breathable roll for conveying a molten resin sheet comprising cylindrical dividing member moving means configured to move the cylindrical dividing member so that the diameter and tension of the breathable cylinder can be changed at both ends. . Furthermore, the present invention provides a plastic bubble sheet forming apparatus in which a plurality of depressions are formed in a plastic film and a plurality of closed cell projections are formed by joining another plastic film to the bottom surface of the air bubble roll. The present invention relates to a plastic foam sheet molding apparatus used as a roll for guiding a resin sheet to a plastic foam sheet molding apparatus.

  The present invention relates to an improvement of a breathable roll used for molding a plastic sheet. The air-permeable roll of the present invention is used for conveying a molten resin sheet. Since the melted resin sheet is easily deformed by tensile tension or the like, and has a non-uniform and distorted structure such as cooling, careful attention is required in the conveying means. The melted resin sheet includes not only a sheet melted by heat with a thermoplastic plastic but also a sheet formed by dissolving in a solvent and containing a solvent such as polyvinyl alcohol or cellulose acetate. In addition, the molten resin sheet includes a case where the thermosetting resin sheet has not yet been cured and has fluidity as a whole. These melted and dissolved resin sheets may be molded by extrusion molding or the like, or may be melt-fluidized by heating or the like after being cooled and molded as a solid sheet. . Further, in the present invention, what is expressed as a sheet includes a sheet having a thickness of 10 mm or less, usually called a film, and a sheet having a thickness of several mm, which is 200 μm or more, called a sheet.

  The present invention relates to improvements in breathable rolls. The breathable roll in the present invention has a roll surface formed of a breathable material. The breathable material is typically a mesh called a metal mesh, a plastic net, a screen mesh, or the like, which is made of a mesh structure in which metal wires or plastic cords are woven, netted, and arranged in various forms. These meshes are defined by the wire diameter (mm), mesh opening (mm), aperture ratio (%), etc. of the metal wire or plastic cord constituting the mesh, but the wire such as the metal wire used in the present invention. The diameter is 0.02 mm to 1.9 mm, the mesh opening is 0.02 mm to 22.4 mm, and the aperture ratio is appropriately selected from the range of 25.0 to 93.7%. The air-permeable roll is constituted by a roll surface having these mesh materials formed in a cylindrical shape, and it is desirable that these mesh materials are formed in a cylindrical shape without joints.

  Another example of the breathable material is a punching plate. The punching plate is a thin plate made of metal or plastic with various perforations. As the metal, stainless steel, nickel, aluminum or the like is used. As the resin sheet, a fluororesin-based sheet or other heat resistant resin sheet is used. As other examples of the breathable material, woven fabrics, knitted fabrics, nonwoven fabrics, and the like formed by entanglement of heat-resistant fibers such as glass fibers and aramid fibers, and fibers such as metal fibers can also be used.

  The air permeability of the air permeable material in the present invention is preferably 20 cc / cm 2 · sec or more, more preferably 200 cc / cm 2 · sec or more, as measured by the JISL 1096 Frazier method.

  The breathable roll of the present invention is constructed on a driving roll that becomes a core. The drive roll has a normal roll shape, and is configured such that the roll can rotate by receiving rotational energy from external power. The inside of the drive roll of the present invention preferably has a structure in which the roll can be cooled by cooling air or cooling water. Further, as the air-permeable roll, a roll having a rotary motor inside the roll, such as an electric roll, is used.

  The roll diameter of the drive roll in the present invention is tapered in the axial direction of the roll, and the inner diameter of the suction cylinder is opposite to the taper direction of the drive roll, so that the roll is fitted to the drive roll. A roll arranged in this manner can also be used. By doing in this way, the drive roll (or suction cylinder) is pushed along the taper by a flange or the like, so that the divided suction cylinder diameter is expanded, and as a result, the breathable cylinder diameter is expanded. The breathable material on the surface can be kept in tension. Further, such a taper shape facilitates the detachment of the suction cylindrical portion from the drive roll, and facilitates assembly and sweeping.

  The air-permeable roll of the present invention has a suction cylinder that is arranged so as to cover the roll surface of the drive roll from above the drive roll and is configured to be fitted to the drive roll. This suction cylinder is characterized in that a large number of vacuum suction holes are arranged on the surface and are divided and arranged so as to be opened in the radial direction from the drive roll shaft. The suction cylinder sucks air from the back surface of the breathable material of the breathable roll and works to bring the molten resin sheet into close contact with the breathable roll. The suction cylinder may be divided into two parts, but it can also be divided into more parts. A large number of vacuum suction holes are arranged on the surface of the suction cylinder, and several tens or several hundreds or thousands when the number is large.

  The inside of the suction cylinder of the present invention has a plurality of axial holes which are air passages arranged in the axial direction of the cylinder corresponding to the vacuum suction holes. The axial holes are connected to the individual vacuum suction holes, and serve to connect the negative pressure of the vacuum source to the individual vacuum suction holes. A fixed side plate is provided in contact with a part of the circumference at the cylindrical end of the suction cylinder. The axial hole in a part of the cylinder is led to a vacuum source, and the axial hole and the vacuum suction hole are provided. It is comprised so that it may become a negative pressure.

  Although the suction cylinder of the present invention is divided, the cylindrical dividing member is narrow in the axial direction of each of the divided suction cylinders. The cylindrical dividing member is plate-shaped and has a taper so that it can be easily pushed into the suction cylinder. There are various types of taper shapes. The basic shape is a member that tapers in the radial thickness of the roll. And it is preferable that it is a member which also makes a taper in thickness in the other direction rather than one side of a roll. These specific types are described in the figures.

  The cylindrical dividing member can be further pushed between the divided suction cylinders to increase the diameter of the suction cylinder. Then, the tension of the breathable cylinder is adjusted by pushing the cylindrical dividing member. The direction in which the cylindrical dividing member is pushed in may be a direction to be pushed outward in the radial direction of the suction cylinder, a direction to be pushed toward the center of the axis in the axial direction of the suction cylinder, or a direction that serves as the two directions. it can. Further, at the time of sorting, the cylindrical dividing member can be easily removed, so that the breathable cylinder can be easily removed from the suction cylinder, and the breathable cylinder can be easily replaced.

  A breathable cylinder is disposed on the surface of the suction cylinder of the present invention. The breathable cylinder is a cylinder made of the breathable material and forms a surface in contact with the molten resin sheet, and at the same time serves as a tag that does not separate the divided suction cylinders. As described above, when the cylindrical dividing member is pushed in, the diameter of the suction cylinder is increased, and the breathable cylinder is fixed with tension. The breathable cylinder used for the molten resin sheet is easily soiled and easily damaged mechanically, and therefore needs to be frequently replaced. In addition, the breathable cylinder used for the molten resin sheet needs to be finely adjusted in tension, including the degree of thermal expansion.

  In the present invention, there is provided a cylinder dividing member moving means which is pushed mainly in the axial direction of the cylinder between the divided suction cylinders. As an example of this moving means, the drive roll has a flange at at least one end, and a screw at the end of the drive roll is tightened by a nut, so that the flange pushes the cylindrical dividing member in the axial direction of the suction cylinder, and the ventilation The diameter of the conductive cylinder can be increased to provide tension. In addition, it is desirable that the tightening by the nut is prevented from loosening by a double nut method. In addition, when removing a cylindrical division member for replacement | exchange of a breathable cylinder, etc., the nut of this thread part is loosened and a flange is removed. Then, the suction cylinder is easily divided by mechanically striking it in the direction opposite to the direction in which the cylindrical dividing member is pushed. The flange used here can be replaced with nuts at both ends of the drive roll.

  As another cylindrical dividing member moving means in the present invention, there is a cylindrical dividing member moving means which is pushed mainly in the radial direction with respect to the cylinder between the suction cylinders into which the cylindrical dividing member is divided. In this case, the drive roll and the suction cylinder are tapered so that they can be fitted to each other. At least one end of the drive roll has a flange, and the screw at the end of the drive roll is fitted to the screw. By being tightened by the nut, the divided suction cylinder and the drive roll are pushed into each other, whereby the diameter of the suction cylinder is increased, so that the diameter of the breathable cylinder can be increased and the tension can be increased. In addition, the flange used here can also be replaced with nuts at both ends of the drive roll.

  Since the air permeable cylinder on the surface of the air permeable roll is flexible and easily deformed, a portion having a weak tension may be generated on the circumference of the cylinder. As a means for solving such a problem, the cylinder dividing member moving means has a plurality of bolts supported by a flange on the suction cylinder, and by adjusting each bolt with a nut, The tension of the circumference in the peripheral part can be strengthened. In this way, the diameter of the suction cylinder can be partially changed by being pushed by the flange, and the tension of the breathable cylinder can be partially changed.

  As another means for adjusting the partial tension of the air-permeable cylinder, a method in which the side surface of the cylindrical dividing member is directly pushed with a bolt from the flange surface can be adopted. At least one end of the drive roll has a flange applied to the end plate surface of the suction cylinder, and the bolt embedded in the flange presses against the side surface of the cylinder division member to push the cylinder division member between the suction cylinders. As a result, the diameter of the suction cylinder can be partially changed.

  Further, the cylindrical dividing member moving means in the present invention comprises at least two cylindrical dividing members disposed at both ends of the drive roll and having different taper directions in the axial direction of the cylinder of the cylindrical dividing member. It is also possible to change the diameter and tension of the air-permeable cylinder at both ends of the roll by moving each cylindrical divided member by the divided member moving means.

  The breathable roll of the present invention is used as a guide roll for guiding a molten resin sheet to a plastic foam sheet molding apparatus. The molten resin sheet is used as a guide roll when the molten resin sheet is formed by a T-die or the like from the extruder and directly guided to the cell sheet forming apparatus. As another case, a sheet that has already been cooled and molded may be led to a bubble sheet molding apparatus that is heated and melted, and is used as a guide roll in that case.

  According to the present invention, a breathable roll having a uniform tension can stably hold and transfer a molten resin sheet. Moreover, it can be set as the air permeability roll of the mechanism in which a bubble trace and a wrinkle do not enter into a sheet | seat. Moreover, this invention can be set as the air permeable roll provided with the mechanism which hold | grips a sheet | seat firmly so that it may not be wound up with the air inside an air permeable roll, when a sheet | seat contacts a gas permeable roll. In addition, there is an advantage that the sheet can be easily peeled off from the roll. The breathable roll of the present invention can easily exchange the breathable material. Moreover, the breathable roll of this invention can adjust partially the tension | tensile_strength in the circumferential part of a breathable roll, and the tension | tensile_strength of the breathable raw material in both ends of a roll. In the present invention, the tension of the breathable material can be finely adjusted according to the material, temperature, etc. of the breathable material. Furthermore, the present invention can provide a breathable roll with good suction efficiency by suctioning only the portion of the breathable roll where the sheet contacts with negative pressure and not sucking unnecessary portions. The breathable roll of the present invention is particularly suitable for use as a roll for guiding a molten resin sheet to a plastic foam sheet molding apparatus.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings. FIG. 1 is a perspective view showing the entire breathable roll 1 of the present invention. The drive roll 2 includes a narrow-diameter portion having screw portions 3 at both ends of the roll and a large-diameter portion (not shown in the figure hidden by a flange or the like). The suction cylinders 4A and 4B are configured so as to cover a large portion of the roll diameter of the drive roll 2 and to be fitted to the drive roll, and are divided so as to be able to be opened in the radial direction from the drive roll axis. is there. The suction cylinders 4A and 4B have a large number of vacuum suction holes on the surface, but are hidden behind the breathable cylinder 5 and cannot be seen in the figure. A number of axial holes 6 communicating with the respective vacuum suction holes are led from the surface of the end plate of the suction cylinder 4 to the inside of the suction cylinder 4. Cylindrical dividing members 7A and 7B having a plate-like form tapering in the radial direction of the suction cylinder interposed between the divided suction cylinders 4A and 4B are provided. A breathable cylinder 5 made of a cylindrical breathable material is provided so as to cover the cylindrical surfaces of the suction cylinders 4A and 4B. The cylindrical dividing member 7 is pushed in the axial direction of the cylinder between the divided suction cylinders 4 by the flanges 8 being pushed by the nuts 9 fitted to the bolts 3. As a result, the diameter of the air-permeable cylinder 5 is increased, and the air-permeable material constituting the air-permeable cylinder 5 can be stretched. Note that members necessary for driving such as gears and chain wheels connected to an external drive source in the drive roll 2 are omitted in this drawing.

  FIG. 2 shows a drive roll 11 in which the drive roll of the present invention is tapered, and a suction cylinder 12 arranged so as to cover it. The drive roll in the present invention does not necessarily have a taper as shown in this figure. However, since the taper is formed, the suction cylinder 12 can be formed by flanges (not shown) or the like at both ends of the drive roll 11. By being pushed in, the diameter of the divided suction cylinder 12 is increased, and the breathable cylinder 5 covering the cylindrical portion of the suction cylinder 12 can be stretched. The suction cylinder 12 has a number of vacuum suction holes 13 on its surface, and these vacuum suction holes 13 are guided to the side plate 14 by the axial holes 6 and further to a vacuum source (not shown). , It is configured to be sucked in the direction of arrow a. The drive roll 11 is rotatably supported by the bearing portion 15 and rotates by being connected to an external drive source by a pulley or the like. The inside of the drive roll 11 is desirably cooled by passing air or water as indicated by an arrow b.

  FIG. 3 shows an example in which the suction cylinder of the present invention is divided into a number of divided suction cylinders 21A, 21B,..., 21E, 21F. Between the divided suction cylinders 21, cylindrical division members 22A, 22B,..., 22E, 22F are sandwiched. The flange 23 is fixed by the divided suction cylinder 21 and the bolt 24. These cylindrical dividing members 22 are pushed into the suction cylinder 21 divided by tightening the bolts 24 to increase the diameter of the suction cylinder, and as a result, the air-permeable cylinder covering the cylindrical portion of the suction cylinder. 5 can be tensioned. By adopting such a structure, the tension of a part (for example, P part) of the air-permeable cylinder 5 can be strengthened. In order to strengthen the tension of the P part of the breathable cylinder 5, the divided cylinders 22A and 22B are pushed in by tightening the bolts 24 on both sides of the divided cylinders 22A and 22B, thereby dividing the suction cylinder. The space above the cylindrical dividing member on both sides of the 21A portion becomes wider, and the tension of the P portion of the breathable cylinder 5 becomes stronger.

  FIG. 4 shows another example in which the cylindrical dividing member 22 is pushed into the divided suction cylinder 21. The flange 31 is pressed against the cylindrical dividing member 22 by a nut 34 fitted to a screw 33 carved in the drive roll 32. A push bolt 35 is embedded in the flange 31, and the side surface of the cylindrical divided member 21 can be pushed in by tightening the push bolt 35. Since only the portion of the cylindrical dividing member 22 that is pushed in strengthens the tension of the air-permeable cylinder 5, even in this method, the tension of a part of the air-permeable cylinder can be strengthened. In this figure, the example in which the flange is fixed to the drive shaft roll is shown, but it may be fixed to the suction cylinder as shown in FIG. In addition, in this figure, the example pushed by the push bolt from one side of the end plate surface was shown, but when pushed too much by the push bolt from both sides, the bolt that was pushed too much is loosened, By pushing with a push-in bolt, excessive push-in can be adjusted.

  FIG. 5 shows an example in which the cylindrical dividing member 41 is moved in the radial direction in the divided suction cylinder 21. The cylindrical divided members 41 a and 41 b are pressed into the suction cylinder 21 by nuts 42 that fit into screws 33 carved in the drive roll 32. After being pressed, the flange 44 is fixed to the nut 42 by bolts 43a, 43b, 43c, 43d. The flange 44 and the cylindrical dividing member 41a are connected by a lifting bolt 45a and a lifting nut 46a. By tightening the lifting nut 46b, the cylindrical dividing member 41a is pulled upward in the radial direction (upward in this figure). . Similarly, the flange 44 and the cylindrical dividing member 41b are connected by a lifting bolt 45b and a lifting nut 46b. By tightening the lifting nut 46b, the cylindrical dividing member 41b is pulled upward in the radial direction (downward in this figure). It is done. In addition, although the example which pulls up with a nut was shown in this figure, a cylindrical division member can also be pushed up to a cylinder outer side direction with a volt | bolt. Further, in the method shown in this figure, if there is a portion that is too widened by the lifting nut 46, it can be finely adjusted by loosening the lifting nut 46.

  FIG. 6 shows another example in which the cylindrical dividing member 51 is moved in the radial direction within the divided suction cylinder 21. The flange 53 is pushed in by tightening the nut 52 fitted to the screw 33 carved in the drive roll 32. The flange 53 and the cylindrical dividing members 51a and 51b are in contact with each other at an oblique surface at the contact point. When the flange 53 is pushed toward the center of the drive roll 32, a large number of cylindrical dividing members 51 such as the cylindrical dividing members 51a and 51b are simultaneously formed. Pushed up radially outward. Although not limited to this figure, the parts where the mechanical parts slide relative to each other are preferably finished with a hard and wear-resistant surface, and a lubricant such as grease is preferably applied. In addition, the nut 52 can also serve as the flange 53 by forming the inclined surface of the nut 52 in this figure like the flange 53. Further, by combining this figure and the mechanism of FIG. 5, not only the case where the entire cylindrical dividing member 51 can move outward in the radial direction as shown in this figure, but also the individual cylindrical dividing members 51a, 51b,. The radial movement can also be finely adjusted.

  FIG. 7 illustrates a mechanism for adjusting the tension of the air-permeable cylinder (not shown because it is complicated) at both ends of the roll. The cylindrical dividing member 56a has a taper of a type that is thick on the left side of the drawing and becomes thinner toward the right side. The cylindrical dividing member 56b has a taper that is thin on the left side of the drawing and becomes thicker toward the right side. These cylindrical dividing members 56a and 56b are made to narrow between the divided suction cylinders 57a and 57b, and the cylindrical dividing member 56a (or both of 56a and 56b) is pushed in from the left side by a flange, a push bolt, etc. The tension of the breathable cylinder on the left side can be increased.

  FIG. 8 illustrates an example of the cylindrical dividing member used in the present invention divided into various types. The cylindrical dividing member 58a in FIG. 1A is tapered when the drive shaft side (bottom surface) is thick and the air-permeable cylinder side (top surface) is thin (du <db), which is the basic shape of the taper of the present invention. It is. The height h is the same on the left and right (h1 = h2), and the thickness of the bottom and top plates is the same on the left and right (d1 = d2). The type of this figure is effective when the cylindrical dividing member is pushed only in the radial direction of the suction cylinder as shown in FIGS. The cylindrical dividing member 58b in FIG. (B) shows an example in which the left and right sides of the basic shape 58a are on the left side and the upper surface and the bottom surface are thick (d1> d2). The left side need not be large on both the top surface and the bottom surface, but it is desirable that at least the left side of the bottom surface be large. The height h is the same on the left and right (h1 = h2). The type of this figure (b) is particularly suitable for the correspondence between the cylindrical dividing member and the divided suction cylinder in the case of FIGS. The cylindrical dividing member 58c in FIG. 5C is shown in the above-described 58b when the height h is larger on the left side (h1> h2). The type shown in FIG. 2C is particularly suitable when the cylinder in FIG. 2 and the suction cylinder divided into the divided members are fitted together by being tapered. As other types, there are examples such as d1 = d2, h1> h2, and du <db.

  FIG. 9 is a perspective view of an apparatus in which the breathable roll of the present invention is used in a plastic foam sheet forming apparatus. The surface of the rotating cylinder 61 has a number of vacuum suction holes 62, and each vacuum suction hole 62 communicates with an axial hole 63. The number of the vacuum suction holes 62 and the number of the axial holes 63 are rough because they are complicated in the figure, but the actual devices are arranged more densely. The axial holes 63 are desirably distributed at equal positions in the circumferential direction of the cylinder as viewed from the side surface of the cylinder 61. The vacuum suction holes 62 are arranged in a row in the horizontal direction. For example, the axial holes 63a communicate with the row of vacuum suction holes 62 in the range indicated by the dotted line. A fixed side plate 64 (shown by a dotted line) is provided on a part of the side surface of the cylinder 61, and is led through a duct 65 to a vacuum source (not shown). In addition, it is desirable to attach a fixed side plate to the other side surface of the cylinder 61 and perform negative pressure suction from both surfaces of the cylinder, but this is omitted in the figure. Since the fixed side plate 64 is in airtight contact with the rotating cylinder 61, the axial hole 63 is depressurized while rotating from a vacuum source connected to the side plate 64. On such a rotating cylinder 61, a molten film 65 serving as a raw material for the cap film is guided through a breathable roll 66 that serves as a turn roll. Then, the guided molten film 65 is vacuum-formed by the vacuum suction hole 62 communicating with the axial hole 63 in the range of the side plate 64 decompressed by the axial hole 63 on the cylinder 61 to form bubble protrusions. The When bubble projections are formed on the cap film, a molten film 67 as a raw material for the back film is introduced, passed through a breathable roll 68 serving as a turn roll, laminated with the cap film, and then a plastic bubble sheet 69. By using the air-permeable rolls 66 and 68 of the present invention, which serves as a turn roll, in the apparatus as shown in this figure, the molten film is stabilized without cooling and without wrinkles or slack. Then, it is guided to a plastic bubble sheet molding apparatus, and a high-quality plastic bubble sheet can be molded. Further, although not shown in the drawing, the plastic bubble sheet 69 is often laminated with a liner film on the surface of the projection of the bubble sheet in the subsequent process of this drawing. When this breathable roll of the present invention is used as a turn roll when transferring the molten film, which is the raw material of the liner film, to the laminating section, high-quality and stable lamination is achieved without wrinkles on the liner film. can do.

  The breathable roll of the present invention is used for conveying a molten resin sheet, and is particularly suitable for conveying a molten sheet to a plastic foam sheet forming apparatus.

The perspective view of the breathable roll of the present invention. Sectional drawing which shows the example of the air permeable roll of this invention. The other sectional view showing the example of the air permeability roll of the present invention. Sectional drawing which shows the example of a means to move the cylindrical division member in the air permeable roll of this invention. Sectional drawing which shows the other example of the means to move the cylindrical division member in the air permeable roll of this invention. Sectional drawing which shows the other example of the means to move the cylindrical division member in the air permeable roll of this invention. Sectional drawing which expanded a part of air permeability roll of this invention. The perspective view which shows the various types of the cylindrical division member in this invention. The perspective view of the apparatus which shows the example in which the air permeable roll of this invention is used for the plastic foam sheet forming apparatus.

Explanation of symbols

1: breathable roll, 2: drive roll, 3: threaded part, 4: suction cylinder,
5: Breathable cylinder, 6: Axial hole, 7: Cylindrical divided member, 8: Flange,
9: Nut.
11: Drive roll, 12: Suction cylinder, 13: Vacuum suction hole,
14: Side plate, 15: Bearing part.
21: suction cylinder, 22: cylindrical divided member, 23: flange,
24: bolt, P: part of a breathable cylinder.
31: Flange 31, 32: Drive roll, 33: Screw,
34: Nut, 35: Push bolt.
41: Cylindrical dividing member, 42: Nut, 43: Bolt, 44: Flange.
45: Lifting bolt 46: Lifting nut
51: Cylindrical dividing member, 52: Nut, 53: Flange.
56a, 56b: cylindrical dividing members, 57a, 57b: suction cylinders.
58a, 58b, 58c: cylindrical dividing member 61: cylinder, 62: vacuum suction hole, 63: axial hole,
64: side plate, 65: duct,
65: Molten film, 66: Breathable roll, 67: Molten film,
68: Breathable roll, 69: Plastic foam sheet.

Claims (10)

(A) a driving roll;
(B) The roll surface of the drive roll is covered and configured to be fitted with the drive roll, and a large number of vacuum suction holes are arranged on the surface so that the drive roll shaft can be opened in the radial direction. A suction cylinder that is divided into two parts;
(C) a cylindrical divided member having a plate-like shape that is interposed between each of the divided suction cylinders and is tapered in the radial direction of the suction cylinder;
(D) a breathable cylinder provided to cover the cylindrical surface of the suction cylinder;
(E) the cylinder dividing member moving means configured to be pushed between the divided suction cylinders;
A breathable roll for conveying a molten resin sheet, comprising: Inside the suction cylinder of claim 1,
(A) a plurality of axial holes which are air passages arranged in the axial direction of the suction cylinder corresponding to the vacuum suction holes;
(B) It is provided in contact with a part of the circumference at the cylindrical end of the suction cylinder, and is configured to guide the axial hole in a part of the cylinder to a vacuum source and to suck the axial hole under a negative pressure. A fixed side plate,
A breathable roll for conveying a molten resin sheet. The roll diameter of the drive roll is tapered in the axial direction of the roll, and the internal diameter of the suction cylinder disposed so as to be fitted to the drive roll is opposite to the taper direction of the drive roll. The breathable roll for conveying a molten resin sheet according to claim 1, wherein the breathable roll is configured to be fitted to the drive roll by forming a taper of the tape. There is a flange on the end plate surface side of the suction cylinder, and a nut that fits into a screw at the end of the drive roll is tightened, and the cylindrical split member is pushed in the axial direction of the cylinder by pushing the flange, 2. The breathable roll for conveying a molten resin sheet according to claim 1, comprising the cylinder dividing member moving means configured such that the diameter of the breathable roll is expanded and the breathable cylinder is in a tensioned state. The suction cylinder has a flange on the end plate surface side, and the flange is supported by the suction cylinder by a plurality of bolts. By adjusting each bolt with a nut, the cylindrical dividing member is pushed by the flange. The breathable roll for conveying a molten resin sheet according to claim 1, comprising the cylindrical dividing member moving means configured to be able to partially change the diameter of the suction cylinder. The suction cylinder has a flange on the side of the end plate surface, the bolt embedded in the flange is pressed against the side surface of the cylindrical dividing member, and the cylindrical dividing member is pushed between the suction cylinders to thereby form the suction cylinder. The breathable roll for conveying a molten resin sheet according to claim 1, comprising the cylindrical dividing member moving means configured to be able to partially change the diameter. The suction cylinder has a flange on the side of the end plate surface, the flange is fixed to the drive roll, and the cylindrical dividing member and the flange are connected by a screw, and the cylindrical dividing member is connected by the screw. 2. The molten resin sheet conveying breathability according to claim 1, comprising the cylindrical dividing member moving means configured to be able to partially change the diameter of the suction cylinder by moving outwardly in the radial direction of the suction cylinder. roll. A flange is provided on the end plate surface side of the suction cylinder, the flange and the cylindrical dividing member are in contact with each other at an oblique surface, and a plurality of the cylindrical divisions are performed by pressing the flange into the axial center of the driving cylindrical shaft. The breathable roll for conveying a molten resin sheet according to claim 1, comprising the cylindrical dividing member moving means configured to change the diameter of the suction cylinder by moving a member radially outward of the suction cylinder. . The drive roller is composed of at least two cylindrical split members disposed at both ends of the drive roll and having different cylindrical taper directions in the cylindrical split member, and the cylindrical split members are respectively moved by the cylindrical split member moving means at both ends. The breathable roll for conveying a molten resin sheet according to claim 1, comprising the cylinder dividing member moving means configured to be moved so that the diameter and tension of the breathable cylinder can be changed at both ends. . 2. The plastic air bubble sheet forming apparatus in which a plurality of hollows are formed in a plastic film, and a plurality of closed air bubble projections are formed by joining another plastic film on a bottom surface of the plastic film. A plastic foam sheet molding apparatus used as a roll for guiding a resin sheet to the plastic foam sheet molding apparatus.

Images