TW201623130A - Grooved roller, and apparatus and method for manufacturing plastic film using same - Google Patents

Abstract

The present invention provides a grooved roller having a helical groove or an annular groove formed on a roller surface, wherein a protruded portion sandwiched between the grooves is shaped in a manner such that rectilinear light causes the shadows of the protruded portion to be projected to the respective grooves sandwiching the protruded portion, the rectilinear light irradiating the protruded portion in a direction that passes through the center axis of the roller and is perpendicular to the center axis. The present invention provides a grooved roller that will never cause a web or sheet to be electrically charged or scratched even at both edges of the protruded portion.

Description

Roller with groove, manufacturing device and manufacturing method of plastic film using the same

The present invention relates to a manufacturing apparatus and a manufacturing method of a grooved roller and a plastic film using the same.

In the case of a device for processing a plastic film or a sheet or a sheet-like industrial product such as paper, metal foil, cloth, glass, or the like, a roller having a groove on the surface is widely used.

In the case of continuously conveying the conveying roller for the sheet in the longitudinal direction, the contact is blocked by the air film sandwiched between the surface of the roller and the sheet, and the frictional force is insufficient, and the sheet is serpentine. In order to prevent this meandering, air is released by providing a groove on the surface of the roller (Non-Patent Document 1).

In terms of winding a sheet into a roll, in order to adjust the amount of air sandwiched between the sheets or to prevent the sheet from being misaligned, a pressure roller called a contact roller or a touch roller is generally used. (hereinafter referred to as a touch roller) is crimped on one side of the sheet roll. The groove is placed on the surface of the roller to control the amount of air trapped (for example, Patent Document 1).

In the film production apparatus which extrudes a molten resin into a sheet shape and cools and solidifies on a cooling roller to obtain a plastic film (hereinafter simply referred to as a film), an oligomer or an additive which volatilizes from a molten resin is deposited. Accumulating on the cooling roller causes the cooling capacity to decrease or the accumulated dirt to peel off and adhere to the film. In order to prevent this, a grooved pressure roller called a sweeping roller is used. By pressing the film with the cooling roller and the sweeping roller, the film can be taken away by a portion of the oligomer or the like which is often deposited on the cooling roller. However, when the molten resin comes into contact with the cooling roller, the air sandwiched between the resin and the roller is blocked by the pinch point of the cooling roller and the cleaning roller, and becomes an air reservoir (hereinafter referred to as an air reservoir). Wrinkles or cracks occur on the film. In order to prevent this, a groove is provided on the surface of the sweeping roller (for example, Patent Document 2).

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2000-177890

Patent Document 2: Japanese Patent Publication No. 39-21127

[Non-patent literature]

Non-Patent Document 1: Hashimoto's "Basic Theory and Application of Sheet Processing", pp. 205~218

However, when a roller with a groove is used as a conveying roller or a roller, the following problems occur:

(1) In both edges of the convex portion formed by the groove and contacting the sheet, the sheet is strongly charged and a discharge phenomenon occurs.

(2) In the two edges of the convex portion formed by the groove and contacting the sheet, the flaw is issued Born on the sheet.

Further, there is a problem in that the roller is removed: since the groove is formed on the surface of the roller, the flaw occurs on the film at both edges of the convex portion.

The present invention provides a grooved roller which does not cause charging or scratching of a sheet or a sheet even at both edges of the convex portion. Furthermore, the present invention provides a manufacturing apparatus and a manufacturing method of a plastic film using the grooved roller.

The first grooved roller of the present invention which achieves the above object has a groove formed on the surface, and the groove is one or more spiral grooves in the circumferential direction of the roller or a plurality of rings in the circumferential direction of the roller. The groove, the convex portion sandwiched between the groove and the groove has a shape in which the shadow of the convex portion is projected by the straight light to the groove that surrounds the convex portion, and the straight light is passed through the central axis of the roller This central axis is perpendicular to the convex portion.

Further, in the second grooved roller of the present invention, a groove is formed on the surface, and the groove is one or more spiral grooves along the circumferential direction of the roller or a plurality of annular grooves along the circumferential direction of the roller. The convex portion interposed between the groove and the groove is formed by a central portion and a side surface portion that sandwiches the central portion and has a longitudinal elastic modulus that is relatively lower than the central portion. In the state where the side surface portion is not present, the central portion is as follows Shape: The shadow of the center is projected by the straight light to the groove at the center of each folder. Upper, the straight light is irradiated toward the central portion from a direction perpendicular to the central axis through the central axis of the roller.

Further, the apparatus for manufacturing a sheet roll of the present invention includes a plurality of conveying rollers that convey the sheet and a winding device that winds the sheet into a roll, and the sheet that is taken up by the winding device from the conveying roller The at least one roller selected from the group consisting of a touch roller for crimping the roll body and a pinch roller for pressing the sheet with a pair of rollers is the first or second grooved roll of the present invention. child.

Further, the manufacturing apparatus of the plastic film of the present invention comprises a T-shaped mold, a cooling roller and a sweeping roller, and the first or second grooved groove of the present invention in which one or more spiral grooves are formed along the circumferential direction of the roller is used. The roller serves as the aforementioned sweeping roller.

Further, in the method for producing a plastic film of the present invention, the molten resin is discharged from the T-shaped mold by using the manufacturing apparatus of the plastic film of the present invention, and the molten resin is brought into contact with the cooling roller to be cooled and solidified, and the molten resin is contacted with the cooling roller. Thereafter, the cleaning roller is brought into contact with the molten resin or the cooled and solidified plastic film during the period of leaving.

In the present invention, the "spiral groove" is, for example, as shown in Fig. 1, the longitudinal direction of the groove is not parallel to the roller rotation axis and the roller rotation direction. The spiral groove may not necessarily be a circle around the circumference, and the direction may be changed in the middle, or the groove may be unconnected from one end of the roller axial direction to the other end.

In the present invention, as shown in Fig. 5, the "annular groove" is a groove in which the groove is parallel to the direction in which the rollers rotate and is connected in a ring shape.

In the present invention, the "transport roller" is a spin. A roller that transfers the sheet along the length of the sheet. The widened roller that conveys the sheet while being widened in the width direction is also included in the transport roller.

In the present invention, the "touch roller" is a roller that rotates while contacting the roll of the roll in the winding device of the sheet.

In the present invention, the "clamping roller" is a roller in which one of the rollers of the sheet being conveyed is sandwiched by a pair of rollers.

In the present invention, the "sweeping roller" is a method of manufacturing a plastic film in which a molten resin is discharged from a T-shaped mold and the molten resin is brought into contact with a cooling roller to be cooled and solidified to form a plastic film. The roller of the molten resin or film is contacted during the period from the roller to the exit.

According to the present invention, as described below, it is possible to provide a grooved roller which does not cause charging or scratching on the sheet or the sheet even at both edges of the convex portion. Further, a manufacturing apparatus and a manufacturing method of a plastic film using the grooved roller of the present invention can be provided.

1‧‧‧roller with groove

2‧‧‧Sheet

3‧‧‧Sheet

4‧‧‧Touch roller (contact roller)

5‧‧‧Transport roller

6‧‧‧Clamping roller

7‧‧‧Plastic film

8‧‧‧ widened roller with groove

9‧‧‧ Film roll

10‧‧‧Sweeping roller

11‧‧‧Axis

12‧‧‧ Rubber

13‧‧‧ spiral groove

14‧‧‧ bearing

15‧‧‧ convex (non-groove)

16‧‧‧Outer tubular components

17‧‧‧ journal

18‧‧‧The central part of the convex

19‧‧‧Side side of the convex part

20‧‧‧Ditch Department

21‧‧‧ Shadow projected by the shape of the convex part

51‧‧‧ annular groove

62‧‧‧ molten resin

63‧‧‧T-model

64‧‧‧Cooling roller

67‧‧‧Edge cutter

68‧‧‧ film edge

69‧‧‧Winding Department

71‧‧‧Floating roller

72‧‧‧Edge cutter

74‧‧‧Transportation Department

75‧‧‧Renovation

76‧‧‧Winding Department

83‧‧‧ inclined trench

85‧‧‧ convex

131‧‧‧Axis

132‧‧‧Outer tubular components

O‧‧‧The central axis of the roller

P‧‧‧Light source

S‧‧‧Direct light

D‧‧‧Light of the radial component

N‧‧‧The line passing through the center between the edges of the convex surface and the center of the rotation axis of the roller

Fig. 1 is a schematic plan view showing an embodiment of a first grooved roller of the present invention.

Fig. 2 is a schematic cross-sectional view showing the shape of a groove and a convex portion of the first grooved roller of the present invention, and is a schematic view showing a state in which straight light is irradiated onto the convex portion.

Fig. 3 is a schematic cross-sectional view showing the shape of a convex portion of the first grooved roller of the present invention in an unloaded state.

Fig. 4 is a schematic cross-sectional view showing the shape of a convex portion of a first grooved roller of the present invention in a pressurized state.

Fig. 5 is a schematic plan view showing another embodiment of the first grooved roller of the present invention.

Fig. 6 is a schematic side view showing the apparatus for manufacturing the plastic film of the present invention.

Fig. 7 is a schematic side view showing the apparatus for manufacturing a sheet roll of the present invention.

Figure 8 is a schematic front view of a conventional grooved roller used as a widening roller.

Fig. 9 is a schematic cross-sectional view showing the shape of a groove and a convex portion of the first grooved roller of the present invention used as a widened roller.

Fig. 10 is a schematic cross-sectional view showing the shape of a convex portion of the first grooved roller of the present invention used as a widened roller in a no-load state.

Fig. 11 is a schematic cross-sectional view showing the shape of a convex portion in a pressurized state of the first grooved roller of the present invention used as a widened roller.

Fig. 12 is a schematic cross-sectional view showing the shape of a convex portion of a conventional grooved roller in an unloaded state.

Fig. 13 is a schematic cross-sectional view showing the shape of a convex portion of a conventional grooved roller in a pressurized state.

Fig. 14 is a schematic cross-sectional view showing the shape of a convex portion of a conventional grooved roller used as a widened roller in an unloaded state.

Figure 15 is a diagram showing a conventional grooved roller used as a widening roller. A schematic cross-sectional view of the shape of the convex portion in a pressurized state.

Fig. 16 is a schematic cross-sectional view showing another embodiment of the first grooved roller of the present invention.

Fig. 17 is a schematic cross-sectional view showing an example of the shape of a groove and a convex portion of the first grooved roller of the present invention.

Fig. 18 is a schematic cross-sectional view showing an example of the shape of a groove and a convex portion of a conventional grooved roller.

Fig. 19 is a schematic view showing a state in which light containing a radial component is irradiated onto a convex portion of the first grooved roller of the present invention.

Figure 20 is a schematic cross-sectional view showing the shape of a convex portion of a second grooved roller of the present invention.

Fig. 21 is a schematic cross-sectional view showing the shape of a convex portion of another embodiment of the second grooved roller of the present invention.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

[First roller with groove]

Fig. 1 is a schematic plan view showing an embodiment of a first grooved roller of the present invention. As shown in Fig. 1, the grooved roller 1 is covered with a rubber 12 on the outer circumference of the shaft 11, and a groove 13 is provided on the surface of the rubber 12.

As for the configuration of the shaft 11, the following configuration can be exemplified:

(1) A simple hollow roller shape as shown in Fig. 1 is a structure in which a journal portion 17 for supporting by a bearing 14 is provided at an end portion of the hollow cylindrical body 16. The roller of this configuration can suppress the manufacturing cost or weight of the roller.

(2) A structure in which a flow path in which a heat transfer medium flows is provided is provided inside. this The constructed roller controls the surface temperature of the roller and can therefore be used in processes that require cooling or heating.

(3) A structure in which the center shaft and the outer tubular member are connected to each other via a bearing. The roller of this configuration can be used as a driven roller having a small mechanical loss by a motor driven by a motor or the like.

(4) A double pipe structure in which the center shaft 131 and the outer tubular member 132 which are disposed concentrically as shown in Fig. 16 are connected only in the axial center portion. When the roller of this configuration is used as a pinch roller or a touch roller, since the outer tubular member 132 is bent in the same direction as the counterpart roller or the sheet roll, uniform pressure can be obtained in the axial direction.

(5) A journal portion is provided at both ends of the outer tubular member via a bearing, and a bending moment is applied to the journal portion to control a curved structure in which the outer tubular member is bent. The roller of this configuration can obtain uniform pressure in the axial direction by bending the outer tubular member in the same direction as the opposing roller or film roll by the bending mechanism.

The material of the shaft 11 can be appropriately selected from general mechanical construction materials, and for example, steel or stainless steel, aluminum, fiber reinforced resin or the like is preferably used.

The type of the rubber 12 is not particularly limited, and may be, for example, natural rubber, nitrile rubber, chloroprene rubber, ethylene propylene rubber, ruthenium rubber, chlorosulfonated polyethylene, amine [formic acid] ester rubber, fluororubber, and the like. The mixture and the mixture of various additives containing a filler in the rubber are appropriately selected and used in accordance with the use environment or the properties of the resin. For example, as in the case of sweeping the rollers, for the purpose of heating from the outside, ethylene propylene rubber, ruthenium rubber, chlorosulfonation polymerization is used. A rubber containing a non-diene rubber as a main component such as ethylene, an amine [ethyl formate] rubber or a fluororubber is preferable, and a ruthenium rubber is particularly preferable. Since the non-diene rubber has good heat aging resistance, the rubber elasticity can be maintained even in a heating environment, and the effects of the present invention can be maintained for a long period of time. In particular, ruthenium rubber is excellent in heat aging resistance, and is excellent in mold release property of a resin which is melted or softened by heating. Further, in the case where an ozone generating source such as an electrostatic application device is provided in the vicinity, an ethylene propylene rubber or the like having excellent ozone resistance is preferably used.

Various surface treatments such as chemical liquid treatment or coating, sputtering, and the like may be applied to the surface of the rubber 12 for the purpose of adjusting the friction coefficient, imparting mold release property, and improving wear resistance.

The rubber hardness of the rubber 12 is not particularly limited, but a range in which a general rubber can be produced can be appropriately selected from Hs30 to 90JISA (JIS K 6301:1995) in accordance with the required performance. Further, from the viewpoint of pressure dispersibility, in the case where a rubber having a low hardness (Hs30JISA or less) is further required, a rubber in which a rubber is made into a sponge shape is suitably used.

The method of coating the rubber 12 on the shaft 11 can be appropriately selected from various methods. For example, applying a bonding material to the surface of the shaft, winding the unsulfurized rubber sheet, applying heat and pressure, performing a method of vulcanization, molding, or inserting the shaft into a rubber which is previously vulcanized and molded into a cylindrical shape And the next method.

At least one spiral groove 13 or a plurality of annular grooves 51 as shown in Fig. 5 are provided on the surface of the rubber 12. In the case of a spiral groove, the groove can be processed over the entire circumference of the roller by at least one processing, so that the processing cost is good. As with fixed knife rollers for slitting sheets, the groove needs When connecting in a ring shape in the direction of rotation, it is suitable to use an annular groove. The number of the spiral grooves 13, that is, the number of grooves in the radial direction of the grooved roller 1 can be appropriately set depending on the use of the grooved roller or the function desired to be realized by the groove. Further, the plurality of spiral grooves 13 may also cross each other. For example, in the case of the widened roller of Fig. 8, in order to obtain a large amount of widening, the closer the guide angle θ of the groove is to 0°, the better the number of grooves is one or two. article. In the case of the touch roller used for the winding device, if the guide angle θ is small, the sheet may fall into the groove and cause wrinkles. Therefore, in order to increase the lead angle θ, it is preferable to use five or more strips.

Fig. 2 is a view showing an example of a cross-sectional shape of a groove and a convex portion of the first grooved roller of the present invention. A groove 13 and a convex portion 15 sandwiched between the groove and the groove are formed on the surface of the grooved roller 1. The convex portion 15 has a shape in which the shadow 21 of the convex portion 15 is projected by the straight light S to the groove 13 that surrounds the convex portion 15, and the straight light S passes through the central axis O of the roller and is separated from the central axis The vertical direction is illuminated toward the convex portion. As shown in FIG. 2, the straight light S is a straight light source P that extends in parallel from the dot 13 or the groove 13 and straightly advances the shortest distance of the virtual light toward the center O of the roller rotation axis. The straight traveling light S does not contain the radiation component D as shown in Fig. 19 which does not go from the light source P toward the center of the roller rotation axis. In other words, each of the side faces of the groove 13 is provided with a portion away from the line N passing through the center between the edges of the two convex portions 15 of the groove 13 and the center O of the rotation axis of the roller. With such a groove shape, it is possible to prevent charging or scratches from occurring on the sheet at both edges of the convex portion 15.

The cross-sectional shape of the convex portion 15 of the grooved roller 1 is not limited to a shape in which the width of the convex portion as illustrated in Fig. 2 is gradually narrowed from the roller surface toward the roller center portion, and may be, for example, a convex portion. Width from the roller table The shape that faces the center of the roller once narrowed and then widened. Even in the shape in which the width of the convex portion is once narrowed and then widened, "the convex portion sandwiched between the groove and the groove has a shape in which the shadow of the convex portion is projected on each of the wrappers by the straight light S. In the groove of the convex portion, the straight light S is irradiated toward the convex portion from the central axis O of the roller from the central axis O, so that the effect of the present invention can be obtained. In short, the grooved roller of the present invention is such that the convex portion sandwiched between the groove and the groove has a shape in which the shadow of the convex portion is projected by the straight light S on each groove that surrounds the convex portion, and the straight line The light S may be irradiated toward the convex portion from a direction perpendicular to the central axis by the central axis O of the roller.

Fig. 12 is a schematic cross-sectional view showing a surface portion of a grooved roller having a typical groove shape. Fig. 13 is a schematic view showing a state in which pressure is applied to the convex portion of Fig. 12. The tension of the sheet or the pressure of the contact pressure of the sheet roll is applied to a conventionally shaped grooved roller, and the pressure locally increases at both edges of the convex portion, and charging or scratching occurs on the sheet. . The present inventors have found that the increase in pressure, as shown in Fig. 13, is caused by the elastic deformation of the convex portion due to the pressure and the bulging of the convex portions.

Figure 14 is a schematic cross-sectional view showing a portion of a generally widened roller surface with grooves. In the case of a general widened roller with a groove, the convex portion collapses due to the pressure, and is deformed as shown in Fig. 15, so that the edge on the opposite side of the collapse direction strongly hits the sheet. Therefore, charging or scratching occurs similarly to the grooved roller of the shape of Fig. 12.

Figure 3 is a schematic cross-sectional view showing the surface portion of the first grooved roller of the present invention. Figure 4 is a view showing the pressure applied to the first aspect of the present invention. A schematic view of the case of the convex portion of the roller of the groove. As shown in Fig. 2, the convex portion 15 has a shape in which the shadow 21 of the convex portion 15 is projected by the straight light S on the groove 13 that surrounds the convex portion 15, and the straight light S passes through the roller. The central axis O is irradiated toward the convex portion from a direction perpendicular to the central axis O. Then, the convex portion is deformed into a convex portion at both edges as shown in Figs. 3 to 4 . Thereby, the increase in pressure on both edges of the convex portion can be released, thereby preventing charging or scratching. Further, in the case of the widened roller having the groove, as described above, by forming the shape of the convex portion shown in Fig. 9, it is deformed as shown in Figs. 10 to 11, so that the same effect can be obtained.

The following method can be exemplified as a method of obtaining the shape of the convex portion of the grooved roller of the present invention. When the cross-sectional shape of the groove 13 is bilaterally symmetrical, a Leutor grinding machine having a shape in which the center of the groove 13 in the width direction and the normal N of the center of rotation of the roller is the axis and the groove cross-sectional shape is rotated is produced. The rubber 12 can be cut. If the cross-sectional shape of the groove 13 is asymmetrical left or right or a complicated shape, it may be melted by a material that is electrically connected to a metal wire having the same shape as the groove cross-sectional shape.

[Second grooved roller]

20 and 21 are schematic cross-sectional views showing the shape of a convex portion of the second grooved roller of the present invention. The convex portion 15 of the second grooved roller is constituted by a central portion 18 and a side portion 19 that sandwiches the central portion 18 and has a longitudinal elastic modulus that is relatively lower than the central portion 18. Further, in a state in which the side surface portion 19 is temporarily removed, the shape of the center portion 18 is such that the shadow of the center portion 18 is projected by the straight light S on the groove that surrounds the center portion, and the straight light S passes through the roller. The central axis O is irradiated toward the central portion 18 from a direction perpendicular to the central axis. Since the longitudinal elastic modulus of the side portion 19 is lower than that of the central portion 18, the deformation of the central portion 18 is not hindered by the side portion 19. Therefore, the deformation of the central portion 18 when the pressure is applied to the convex portion 15 is exactly the same as that of the convex portion 15 of the first grooved roller, so that charging or scratching can be prevented from occurring on the sheet. Further, since the side portion 19 is filled in the portion recessed on both side surfaces of the center portion 18, the cleaning of the groove can be easily performed. As a result, it is easy to prevent contaminants such as low molecular weight substances from accumulating in the groove portion 13, and then contaminating the process or the product due to falling off or scattering. The side surface portion 19 is not connected to the bottom surface of the groove portion 13 as shown in Fig. 20, and may be connected to the bottom surface of the groove portion 13 as shown in Fig. 21 . When the side surface portion 19 is connected to the bottom surface of the groove portion 13, the side surface portion 19 is made of a material having an antifouling property, so that the cleaning of the groove portion 13 can be more easily performed, and contamination can be easily prevented.

In the method of obtaining the convex portion 15, the convex portion 15 is placed on the second grooved roller and the central portion 18 and the side surface portion 19 are different materials, and the following method is used: After the central portion 18 is obtained by the method of the convex portion, the rubber having a longitudinal elastic modulus lower than that of the central portion 18 is filled in the groove portion 13, and then vulcanized, and the groove portion 20 is processed by a well-known processing method such as grinding.

[Manufacturing device for sheet roll]

Fig. 7 is a schematic side view showing an embodiment of a manufacturing apparatus for a sheet roll of the present invention. The sheet 2 conveyed from a front process (for example, an extension process, a coating process, a roll-out process, and the like) (not shown) is controlled by the conveyance unit 74 for a predetermined conveyance tension, and the trimming portion 75 trims an unnecessary edge (bump) portion 73. And/or slitting (cutting) into a predetermined product width, and winding the coiled portion 76 into a roll shape.

The conveying roller 5 used in each part is driven by a motor The movable driving roller, the driven roller that is rotated by the frictional force from the sheet 2, or the roller that is rotated by an indirect driving method called intentional driving or the like. The driving roller controls the conveying speed by controlling the tension of the sheet 2 by friction. The conveyance speed is determined by the tension of the driving roller control sheet 2, and the frictional force of the sheet 2 is indispensable. However, it is difficult to secure the frictional force by sandwiching the air between the sheet 2 and the conveying roller 5. Even if the driven roller is used, there is a case where the friction is insufficient due to the trapped air, and the rotation is poor. As one of means for releasing the trapped air to ensure friction, a roller having a groove is generally used. As described above, if a conventional grooved roller is used for the conveyance roller 5, the pressure is increased at the edge of the convex portion, so that the sheet 2 is charged or damaged in the portion where the pressure is increased. Since the problem can be solved, it is preferable to use the grooved roller 1 of the present invention for conveying the roller 5.

As another means for securing the friction, the pinch roller 6 that presses the sheet 2 with a pair of rollers is sometimes used. By using the pinch roller 6, the air between the sheet and the roller can be excluded, and the friction can be ensured by the pinch pressure. However, the excluded air is only blocked in the nip portion, so air is accumulated between the sheet 2 and the roller 5 in front of the nip portion, and wrinkles sometimes occur on the sheet 2, especially in the thin The sheet with low rigidity is also obvious. As one of means for preventing this wrinkle, a roller having a groove is sometimes used as the pinch roller 6. As the pinch roller 6, it is preferable to use the grooved roller of the present invention. By using the grooved roller of the present invention, it is possible to prevent charging or damage of the sheet 2 which occurs in the conventional grooved roller. In particular, in the case of conveying a thin and rigid sheet, the grooved roller of the present invention is suitable.

Further, one of the conveying rollers 5 has a widening roller for flattening the wrinkles of the sheet, or after cutting the sheet in the width direction, to prevent the cut sheets from overlapping each other to make them along the width Move in direction. In the case of a widened roller having a grooved roller type, it is generally an inclined groove roller 8 as shown in Fig. 8. However, as described above, the convex portion may be collapsed and deformed by the inclined groove, causing the edge portion of the convex portion to strongly hit the sheet, which may cause a problem such as charging or damage of the sheet. It is preferable to use the grooved roller of the present invention having the shape of a convex portion as shown in Figs. 9 and 10 for the widened roller 8. According to the grooved roller of the present invention, the convex portion is deformed as shown in Fig. 11, so that charging or damage can be prevented.

In the winding portion 76, in order to adjust the amount of air between the film layers of the wound sheet roll 3, to prevent wrinkles, clogging, and the like, abutment to the sheet roll body 3 is called using a touch roller or a contact roller. Roller 4. Further, in particular, the roller having the groove is used for the touch roller (contact roller) 4 for the purpose of achieving a large amount of air being wound between the sheet layers. Further, the above-described inclined groove type widened roller 8 is generally used as the touch roller (contact roller) 4. For the same reason as applied to the pinch roller 6, it is preferable to use the grooved roller 1 of the present invention as the grooved touch roller.

As described above, by using the apparatus for manufacturing a sheet roll of the present invention, it is possible to obtain a sheet roll having no defects such as discharge marks due to charging and charging, and scratches.

[Manufacturing device for plastic film]

Fig. 6 is a schematic side view showing an embodiment of a manufacturing apparatus for a plastic film of the present invention. In the manufacturing apparatus of the plastic film of the present invention, As shown in Fig. 6, the molten resin 62 discharged from the T-die is cooled and solidified by the cooling roller 64 to obtain a film 7.

Then, if necessary, the film 7 is extended along the length direction or/and the width direction in the stretching process, and the cutting or edge trimming is performed in the slitting process, and the film is wound into a roll shape in the winding process to obtain a film roll 9 . Thereafter, the product roll is obtained through a slitting process or other processing process as needed.

In the T-die 63, the molten resin 62 which is melt-kneaded and sent is continuously discharged from a slit provided in the depth direction on the drawing by an extruder (not shown), and the molten resin 62 is extruded into a sheet shape.

The molten resin 62 is not particularly limited, and depending on the use of the film 7, for example, a resin such as polyester or polypropylene, polyethylene, ethylene-methyl methacrylate copolymer, ethylene-vinyl acetate copolymer, fluororesin, or the like can be used. A resin in which various additives are added to the resin, or a resin in which these resins are laminated.

The cooling roller 64 uses, for example, a roller having a structure in which a flow path through which a refrigerant flows is provided, and the surface temperature can be controlled.

The material of the surface of the cooling roller 64 is not particularly limited, and a metal, ceramic, resin, a composite film of a resin and a metal, and a carbon-based film such as diamond-like carbon may be used. The surface shape of the cooling roller 64 can be appropriately set depending on the speed of the casting process, the thickness of the film 7, the temperature of the molten resin 62 and the cooling roller 64, and the like.

[sweeping roller]

The sweeping roller 10 is in contact with the molten resin 62 (or the film 7 cooled and solidified) after the molten resin 62 contacts the cooling roller 64 to leave. The molten resin 62 (film 7) is sandwiched together with the cooling roller 64. The dirt, such as an oligomer or an additive which volatilizes from the molten resin 62 and adheres to the cooling roller 64, is continuously taken away by the film 7 to the extent that it does not affect the quality. As a result, it is possible to prevent the cooling capacity of the cooling roller 64 from being lowered by the dirt or the accumulated dirt from adhering to the film 7 once peeled off.

The means for pressing the cleaning roller 10 toward the cooling roller 64 is not particularly limited. However, the convenience of the pressing force or the like can be easily changed, and it is preferable to use a cylinder that uses air pressure. Since the appropriate position at which the cleaning roller 10 contacts the molten resin 62 differs depending on the type or thickness of the film 7, the speed of the casting process, the temperature of the cooling roller 64, and the like, the cleaning roller 10 is changeable in contact with the molten resin 62. The location is well constructed. By changing the distance between the contact position and the contact point of the molten resin 62 and the cooling roller 64 to an appropriate distance, the surface shape of the cooling roller 64 or the cleaning roller 10 can be prevented from being transferred onto the molten resin 64 (film 7). Alternatively, the dirt on the surface of the cooling roller 64 can be sufficiently transferred onto the molten resin 62 (film 7). Although the pressing force of the sweeping roller differs depending on the type or thickness of the molten resin 62 (film 7), it is preferably in the range of 10 to 500 N/m. If the pressing force is in this range, it is possible to prevent the film 7 from being scratched by excessive pressing force, and it is possible to easily transfer the dirt on the cooling roller 64 to the molten resin 62 (film 7).

The sweeping roller 10 in the apparatus for manufacturing a plastic film of the present invention is a grooved roller 1 of the present invention in which one or more spiral grooves 13 are formed along the circumferential direction of the roller.

The configuration of the shaft suitable for the grooved roller (hereinafter referred to as the sweeping roller) for sweeping the roller 10 can be exemplified as follows:

(1) A simple hollow roller structure as shown in Fig. 1. This structure The manufactured roller can suppress the manufacturing cost of the shaft.

(2) A structure in which a flow path through which a refrigerant for cooling flows is provided inside the shaft. In the roller of this configuration, even if the resin having a high temperature contacts the surface of the roller, the temperature of the rubber 12 can be kept constant or lower, so that the rubber 12 can be prevented from being deteriorated by heat.

(3) The structure of the double pipe as shown in Fig. 16. The roller of this configuration can flatten the axial pressure distribution with the cooling roller 64. Further, since the outer tubular member 162 is curved in the same direction as the cooling roller 64, the pressure against the molten resin 64 (film 7) can be made flat in the axial direction of the roller. As a result, it is possible to suppress the pressure from being locally excessive due to the unevenness of the pressure, so that the sweeping mark to be described later is generated and deteriorated.

(4) The shaft 11 is a simple hollow roller shape, and the outer diameter of the rubber 12 coated on the outer circumference is a crown-shaped structure. The roller of this configuration can be expected to have the same effect as the roller of the double pipe structure.

The material of the shaft 11 can be appropriately selected from general mechanical construction materials, and for example, steel or stainless steel, aluminum, fiber reinforced resin or the like is preferably used.

The type of the rubber 12 for sweeping the roller 10 is not particularly limited, and may be, for example, natural rubber, nitrile rubber, chloroprene rubber, ethylene propylene rubber, ruthenium rubber, chlorosulfonated polyethylene, amine [formic acid] ester rubber, fluororubber, In addition, a rubber mixture of these rubbers, and a rubber in which various additives containing a filler are mixed in the rubber, and the properties of the use environment or the resin are appropriately selected and used. For example, when the molten resin 62 (film 7) has adhesiveness or high temperature, it is preferable to use a rubber containing a ruthenium rubber having excellent mold release property and heat resistance as a main component. Stinky in electrostatic application device When the oxygen generating source is provided in the vicinity, it is preferable to use an ethylene propylene rubber or the like which is excellent in ozone resistance.

The rubber hardness of the rubber 12 is not particularly limited, but a range in which a general rubber can be produced can be appropriately selected from Hs30 to 90JISA (JIS K 6301:1995) in accordance with the required performance. For example, in the case where the width of the film or film which is likely to occur in the sweeping mark is wide, since the dispersion of pressure is important, it is preferable to use a rubber having a low hardness (Hs30 to 60 JISA). On the other hand, in the case where the film width is narrow or the durability of the rubber 12 is emphasized, it is preferable to use a rubber having a high hardness (Hs60 to 90 JISA). Further, from the viewpoint of pressure dispersibility, in the case where a rubber having a low hardness (Hs30JISA or less) is further required, it is preferred to use a rubber having a sponge shape.

The so-called sweep mark has the disadvantage that the groove pattern on the surface of the roller 10 is transferred onto the film of the product. The sweep mark can be classified into the following two forms:

(1) The portion of the groove (the convex portion) where the surface of the roller 10 is not formed is transferred to the film, and the dirt on the film is not transferred to the groove portion, and the presence or absence of dirt generated by the dirt is not transferred.

(2) A flaw in which the surface shape of the cooling roller 64 or the cleaning roller 10 is transferred due to pressure at the contact portion.

When the grooved roller having the shape of the conventional convex portion as shown in Fig. 12 is used as the sweeping roller 10, the sweep mark caused by the flaw strongly occurs on both edges of the convex portion. By using the grooved roller of the present invention as the sweeping roller 10, the pressure rise at both edges of the convex portion can be released, so that the occurrence of the sweep mark due to the flaw can be prevented.

[Examples]

(Example)

The manufacturing apparatus of the plastic film shown in Fig. 6 was used. The polypropylene was discharged from the T-shaped mold 63 in a single-layer structure, and cooled and solidified by a cooling roller 64 having an outer diameter of 900 mm rotated at a speed of 50 m/min to prepare a polypropylene film having a thickness of 100 μm, which was taken up by a coiler. A film roll 9 was obtained. The sweep roller 10 has the configuration shown in Fig. 1. The rubber 11 having a rubber hardness of Hs40JISA was coated on the shaft 11 made of carbon steel at a thickness Rt of 15 mm, and the outer diameter was set to 230 mm. There are two spiral grooves on the surface of the sweeping roller. As shown in Fig. 17, the groove width Pw is set to 30 mm, the groove width Gw is set to 30 mm, the groove bottom width Bw is set to 40 mm, and the groove depth Gd is set to 10 mm. The obtained film was visually observed to confirm the presence or absence of the erasing mark, and as a result, the occurrence of the erasing mark could not be confirmed.

(Comparative example)

The groove provided on the surface of the sweeping roller was set to the shape shown in Fig. 18, the convex portion width Pw was set to 30 mm, the groove width Gw was set to 30 mm, and the groove depth Gd was set to 10 mm, and Film formation was carried out in the same apparatus and conditions as in Example 1, to obtain a film roll 9. The obtained film was visually observed to confirm the presence or absence of the erasing mark, and as a result, the scanning mark caused by the flaw occurred in the portion where the both edges of the convex portion contacted.

[Industrial availability]

The invention can be used as a grooved roller in the process of industrial products of sheets or sheets, and is particularly suitable for the manufacture of plastic films, but the scope of application is not limited by such ranges.

11‧‧‧Axis

12‧‧‧ Rubber

13‧‧‧ spiral groove

15‧‧‧ convex

21‧‧‧ shadow

N‧‧‧The line passing through the center between the edges of the convex surface and the center of the rotation axis of the roller

O‧‧‧The central axis of the roller

P‧‧‧Light source

S‧‧‧Direct light

Claims (5)

A grooved roller having a groove formed on a surface thereof, wherein the groove is one or more spiral grooves along the circumferential direction of the roller or a plurality of annular grooves along the circumferential direction of the roller, sandwiching the groove and The convex portion between the grooves has a shape in which the shadow of the convex portion is projected by the straight light to the groove that surrounds the convex portion, and the straight light passes through the central axis of the roller and is directed from a direction perpendicular to the central axis Irradiated by the convex part. A grooved roller having a groove formed on a surface thereof, wherein the groove is one or more spiral grooves along the circumferential direction of the roller or a plurality of annular grooves along the circumferential direction of the roller, sandwiching the groove and The convex portion between the grooves is formed by a central portion and a side surface portion that sandwiches the central portion and has a longitudinal elastic modulus lower than that of the central portion. In a state where the side surface portion is not provided, the central portion has a shape of a central portion. The shadow is projected by the straight light on the groove of the center portion of the bag, and the straight light is irradiated toward the center portion from the direction perpendicular to the central axis by the central axis of the roller. A manufacturing apparatus for a sheet roll body, comprising: a plurality of conveying rollers that convey a sheet and a winding device that winds the sheet into a roll, and the sheet roll that is wound by the winding device from the conveying roller The at least one roller selected from the group consisting of the contact roller that is crimped and the pinch roller that presses the sheet with a pair of rollers is the grooved roller of claim 1 or 2. A manufacturing device for a plastic film, comprising a T-shaped mold, a cooling roller and a sweeping roller, The grooved roller of claim 1 or 2 in which one or more spiral grooves are formed along the circumferential direction of the roller is used as the above-described sweeping roller. A method for producing a plastic film, comprising: using the plastic film manufacturing apparatus of claim 4, discharging molten resin from the T-shaped mold, and causing the molten resin to contact the cooling roller to be cooled and solidified, after the molten resin contacts the cooling roller The cleaning roller is brought into contact with the molten resin or the cooled and solidified plastic film during the period of leaving.