KR101959085B1 - Roll for sheet forming and method for sheet forming - Google Patents

Abstract

(Problem) Improvement of the heating capacity without deteriorating the durability. In addition, a forming roll having different flexibility in the outer cell in the axial direction is obtained.
A cylindrical inner cell 6 disposed inside the outer cell 5 and having an outer diameter smaller than the inner diameter of the outer cell 5; Respectively. In which the outer cell 5 is heated by the temperature control liquid 7 flowing through the space between the outer cell 5 and the inner cell 6, A female threaded or ring-shaped recess 12 extending along the circumference of the shaft is formed. The depth of the concave portion 12 is 0.1 times or more of the thickness in the radial direction of the outer shell 5.

Description

[0001] DESCRIPTION [0002] ROLL FOR SHEET FORMING AND METHOD FOR SHEET FORMING [0003]

The present invention relates to a sheet forming roll and a sheet forming method for forming a long sheet.

As a sheet molding method, there is known a press molding method in which a molten resin extruded from a T-die is sandwiched between a pair of sheet-forming rolls having high rigidity and pressed to form a sheet. In the pressure-forming method, the molten resin can be formed into a sheet-like shape while maintaining an appropriate viscosity by controlling the peripheral temperature of the sheet-forming roll.

Patent Document 1 discloses a roll forming roll having a temperature control function, which is a double pipe roll comprising a thin cylindrical outer cell and an inner cell disposed inside the outer cell. The temperature of the outer periphery of the outer cell, that is, the outer periphery of the double pipe roll, is controlled by flowing a temperature control liquid in a space formed between the outer cell and the inner cell.

Further, in the sheet forming roll disclosed in Patent Document 1, the outer cell can be elastically deformed by using an outer cell made of a thin metal body, and the time during which the sheet to be molded is sandwiched between the sheet forming rolls can be lengthened have. The outer cell of both rolls or one of the outer rolls of the roll for sheet molding can be elastically deformed along the outer peripheral surface of the roll for sheet molding at the time of pressing the sheet. Therefore, compared to the case of a pair of sheet-forming rolls having high rigidity, the time for which the sheet is inserted into the forming roll becomes longer, and the sheet can be smoothed more smoothly.

Patent Documents 2 and 3 disclose a dual pipe roll in which a rubber roll is used as an inner cell and the outer cell is made thinner. The outer circumferential surface of the rubber roll comes into contact with the inner circumferential surface of the outer cell as a thin outer cell which can not apply pressure to the sheet due to insufficient elasticity, so that the pressure is applied to the sheet by the elastic force of the rubber roll. It is possible to make the outer cell thinner, so that the heating ability can be improved. In addition, a thinner sheet can be formed.

Japanese Patent No. 3194904 Japanese Patent No. 3422798 Japanese Patent Application Laid-Open No. 2007-83577

However, in the sheet-forming roll disclosed in Patent Document 1, there is a limitation in size of making the outer cell thinner in order to secure elasticity. When the outer cell is thinned, the deflection of the outer cell becomes large. Therefore, the amount of crown previously formed in the outer cell increases and the outer cell is thin, so that it is difficult to maintain the cylindrical shape and it is difficult to enlarge the roll for sheet molding.

In the rolls for sheet molding disclosed in Patent Documents 2 and 3, rubber rolls are used for the inner back-up rolls, resulting in problems such as poor durability.

In addition, in the conventional sheet forming roll in which the inner surface of the outer cell is flat, the swirling effect due to the turbulence is small and the heat transfer efficiency is low. Therefore, the cooling performance of the outer cell was limited.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a two-sided touch sheet having a thickness of about 0.1 mm, which can be formed by a roll for sheet molding having a width of 2 m or more, Roll. ≪ / RTI > Another object of the present invention is to obtain a roll for sheet molding in which rigidity or flexibility of the thin outer cell is different in the axial direction of the roll for sheet molding.

In order to achieve the above-described object, the sheet forming roll according to the present invention comprises a cylindrical outer cell for press-forming a sheet and an inner cell disposed inside the outer cell and having an outer diameter smaller than the inner diameter of the outer cell. In the sheet forming roll in which the outer cell is kneaded by a tempering fluid that circulates a space between the outer cell and the inner cell, a female screw or ring-shaped concave portion extending along the axis of the outer cell is formed on the inner peripheral surface of the outer cell . The depth of the concave portion is at least 0.1 times the thickness in the radial direction of the outer shell.

Another roll for sheet forming according to the present invention includes a cylindrical outer cell for press-forming a sheet and a cylindrical inner cell disposed inside the outer cell and having an outer diameter smaller than the inner diameter of the outer cell. Wherein the outer cell is tempered by a tempering fluid flowing in a space between the outer cell and the inner cell, wherein a female screw-like or ring-like concave portion extending along the axis of the outer cell is formed on the inner circumferential surface of the outer cell. The pitch of the concave portion is 10 times or less the thickness in the radial direction of the outer cell on the bottom surface of the concave portion.

Another sheet-forming roll according to the present invention includes a cylindrical cell for press-forming a sheet and an axis for supporting the cell. A sheet molding roll wherein a cell is tempered by a tempering fluid flowing through a space between an inner circumferential surface of the cell and an axis is formed with a female screw or ring concave portion extending along the circumference of the cell on the inner circumferential surface of the cell. The depth of the concave portion is at least 0.1 times the thickness in the radial direction of the outer shell.

Another sheet-forming roll according to the present invention includes a cylindrical cell for press-forming a sheet and an axis for supporting the cell. A sheet molding roll wherein a cell is tempered by a tempering fluid flowing through a space between an inner circumferential surface of the cell and an axis is formed with a female screw or ring concave portion extending along the circumference of the cell on the inner circumferential surface of the cell. The pitch of the concave portion is 10 times or less the thickness in the radial direction of the cell on the bottom surface of the concave portion.

In the sheet forming method according to the present invention, a sheet is formed by sandwiching a molten resin between rolls for sheet molding of the present invention.

According to the present invention, it is possible to produce a roll for forming a large sheet having a wide width for forming a relatively thin sheet. In addition, the heating ability can be improved without lowering the durability of the sheet forming roll. In addition, a roll for sheet forming in which rigidity or flexibility of the outer cell thinner in the radial direction is different in the axial direction is obtained.

1 is a schematic view showing a sheet molding apparatus.
2 is a cross-sectional view showing a sheet forming roll.
Fig. 3A is a detailed sectional view showing a roll for sheet molding according to the first embodiment. Fig.
3B is a schematic view showing a guide wall formed in the inner cell of the roll for sheet molding according to the first embodiment.
Fig. 4 is a cross-sectional view showing the sheet forming roll cut along the plane perpendicular to the axial direction.
5 is a cross-sectional view showing a sheet forming roll when a line pressure is applied.
Fig. 6 is a view for explaining the relationship between the direction in which the concave portion extends and the bending easiness of the thin plate.
7 is a cross-sectional view showing a state in which a sheet is sandwiched between rolls for sheet molding.
Fig. 8 is a diagram showing a bending curve in comparison with the sheet forming roll of the present embodiment and the conventional sheet forming roll. Fig.
Fig. 9 is a cross-sectional view showing the shape of a roll for sheet molding to be compared in Fig. 8. Fig.
10 is a detailed sectional view showing a roll for sheet molding according to the second embodiment.
11 is a cross-sectional view showing an outer cell in the third and fourth embodiments.
12 is a cross-sectional view showing an example of the configuration of the depth of the angular recess of the outer cell in the fourth embodiment.
Fig. 13 is a cross-sectional view showing a configuration example of the pitch of a rectangular concave portion of an outer cell in the fourth embodiment. Fig.
14 is a view for explaining a step of machining a concave portion in an outer cell according to the fifth embodiment.
15 is a cross-sectional view showing the shape of a concave portion of the outer cell in the sixth embodiment.
16 is a cross-sectional view showing a roll for sheet molding of the seventh embodiment.
17 is a cross-sectional view showing a roll for sheet molding of the eighth embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0027] The embodiments of the present invention will be described in detail with reference to the drawings.

In the present specification, the term "linear pressure" means a force per unit length in the axial direction of the roll (for example, 100 N / cm) when a pair of rolls is pressed. Line pressure is also called nip pressure.

The " crown " refers to a shape in which the central portion in the axial direction of the roll is thicker than the axial end portion of the roll. Quot; crown amount " refers to the value of the diameter difference between the axially central portion of the roll and the axial end portion of the roll. When the diameter of the axial center portion of the roll is D1 and the diameter of the axial end portion of the roll is D2, Crown amount = D1-D2.

Hereinafter, the present invention will be described in more detail with reference to the embodiments, but the present invention is not limited thereto at all. In the following description, the same parts as those in the above-described embodiment are denoted by the same reference numerals.

(First Embodiment)

Fig. 1 shows a schematic view of a molding apparatus for press-forming a sheet. The sheet 2 to be molded by the molding apparatus 1 is a transparent clear sheet having a thickness in the range of about 0.05 mm to 1 mm and made of resin such as PC (Polycarbonate), PMMA (Polymethylmethacrylate), PET (Polyechylene Terephthalate) And is molded using a material.

As shown in Fig. 1, the molding apparatus 1 includes a T die 3 for extruding a resin material into a sheet form, a roll for sheet forming (hereinafter referred to as a forming roll Quot;) 4a, 4b and 4c. The forming rolls 4a, 4b and 4c have the same width with respect to the axial direction of the forming roll. The sheet is formed by applying linear pressure to the sheet 2 by the forming rolls 4a, 4b and 4c.

The T die 3 extrudes the resin material fed from an extruder (not shown) into a sheet form, and guides the resin material to the gap between the pair of the forming rolls 4a and the forming rolls 4b. The forming rolls 4a and 4b are arranged so that the gap between the forming roll 4a and the forming roll 4b is positioned below the T die 3 in the downward direction of the vertical direction of the T die 3 have.

The forming roll 4a and the forming roll 4b are arranged parallel to each other so as to sandwich the molten resin therebetween. The moldability of the resin material can be enhanced by accommodating the molten resin extruded in the downward direction in the vertical direction in the pair of the forming rolls 4a and the forming rolls 4b.

The forming roll 4b is fixed in position, and the forming roll 4a can be moved in the direction of opening and closing the gap with the forming roll 4b (the direction of the white arrow shown in Fig. 1) by a pressing device . The forming roll 4a and the forming roll 4b are usually rotated at the same peripheral speed and apply a uniform pressure across the width of the forming roll 4a and the forming roll 4b in the axial direction, Mold to a certain thickness.

The sheet 2 is wound on the forming roll 4b after passing through the gap between the forming roll 4a and the forming roll 4b and transported to the downstream side in the carrying direction by the forming roll 4c as required. As in the case of the forming roll 4a, the forming roll 4c can also be moved in the direction of opening / closing the gap with the forming roll 4b (direction of white arrow in Fig. 1) by a pressing device .

After passing through the forming roll 4c, the sheet 2 is cooled and wound into a coil, or cut to a predetermined length. The sheet 2 may be pressure-formed again using a forming roll 4c or another forming roll (not shown), if necessary.

Next, the structure of the forming roll 4a will be described. Fig. 2 shows a cross-sectional view (cross-sectional view taken along the line A-A in Fig. 1) when the forming roll 4a is cut at a plane passing through its central axis.

As shown in Fig. 2, the forming roll 4a is made up of a cylindrical tube 5 made of a thin metal body having elasticity, and an inner cell 6 having an outer diameter smaller than the inner diameter of the outer cell 5, to be. Therefore, a space is formed between the inner circumferential surface of the outer cell 5 and the outer circumferential surface of the inner cell 6, and a flow path 8c through which the temperature control liquid 7 as the temperature control fluid flows is formed. The outer cell 5 and the inner cell 6 shown in Fig. 2 are forcible, and the forming roll 4a is also formed by welding steel. Further, a gas or a vapor-liquid mixed fluid may be used instead of the temperature control liquid 7 as the warming fluid.

The shaft 9 and the flange 10 are welded to both ends of the inner cell 6 so that the shaft 9 can be rotated by the bearing 11. [ One end of the shaft 9 is connected to the motor 23, and the forming roll 4a is rotationally driven by the motor 23 at a predetermined speed. Further, in the forming roll, the side to which the motor 23 is connected is the driving side, and the side opposite to the driving side is the operating side.

The bearing 11 is formed in a pressing device that presses in the direction of opening and closing the clearance between the forming roll 4b and the forming roll 4a (in the direction of the white arrow in Fig. 1) via a bearing casing . As a pressurizing device, a pneumatic or hydraulic cylinder type is usually used. The roll bearing casing is supported so as to be movable by the linear guide, and the forming roll can move in parallel.

A flow path 8a through which the temperature control liquid 7 flows and a flow path 8e around the flow path 8a are formed in the shaft 9 on the operation side. The flow path 8a passes through the center of the forming roll 4a from the operating shaft 9 and is formed on the driving shaft 9. The flange 10 on the drive side is provided with a flow path 8b for communicating the flow path 8a and the flow path 8c and the flow path 8c and the flow path 8e (Not shown) are formed.

Fig. 3A shows a detailed sectional view of the forming roll 4a shown in Fig. 2, which is enlarged from the central portion in the axial direction to the operating side. In Fig. 3A, the center position of the axial length L of the forming roll is indicated by F. Fig. 3A, a concave portion 12 extending along the axis of the outer shell 5 is formed on the inner peripheral surface of the outer shell 5. [ In the first embodiment, the concave portion 12 is formed with a female-threaded groove having a trapezoidal cross-sectional shape perpendicular to the longitudinal direction in which the concave portion 12 extends. The concave portion 12 is constituted by a single screw formed by one continuous groove.

The pitch P of the concave portion 12 adjacent to the outer cell 5 in the axial direction is an important dimension for obtaining the flexibility of the outer cell 5, and the details will be described later.

In the first embodiment, the pitch P of the concave portion 12 is 4 mm, the thickness of the outer shell 5 is 5 mm, and the flexibility of the outer shell 5 is orthogonal to the longitudinal direction in which the concave portion 12 extends And has a different effect in the direction in which it is made. This pitch P is also important from the viewpoint of heat transfer.

The pitch P of the neighboring concave portions 12 should be set to be equal to or smaller than the thickness of the outer shell 5 in the radial direction in order to enhance the uniformity of the temperature control capability in the outer peripheral surface of the outer shell 5. [ The temperature deviation of the sheet 2 contacting the forming roll 4a at the time of forming becomes small, and the crystallization deviation of the sheet 2 is reduced.

The concave forming portion 12p in which the concave portion 12 is formed is formed in a wider range than the sheet contacting portion (sheet width) 2p to which the sheet 2 contacts. A concave portion (hereinafter referred to as a small concave portion 13) having a depth smaller than that of the concave portion 12 is formed at a portion from the end of the concave forming portion 12p to the end of the sheet contacting portion 2p.

The small recesses (13) have the role of eliminating abrupt changes in the thickness of the outer shell (5). Therefore, it is possible to prevent the concentration of stress generated at the position where the thickness is abruptly changed and to prevent the outer cell 5 from being damaged. A taper (not shown) in which the inner circumferential surface of the outer shell 5 is gently changed with respect to the axial direction of the outer shell 5 can be obtained by gradually changing the radial thickness of the outer shell 5 as a substitute for the small recess 13 .

A plating film is formed on the inner peripheral surface of the outer shell 5 to prevent corrosion of the outer shell 5 which is forced. Particularly, since the bottom surface of the concave portion 12 is thinly formed, it is important to prevent corrosion in order to maintain the mechanical strength of the cell for a long period of time. In the first embodiment, Ni plating is performed.

The depth D of the concave portion 12 of the outer shell 5 of the forming roll of the present embodiment is at least 0.1 times the thickness t1 of the outer shell 5 (see FIG. 12). The pitch P of the concave portion 12 (the pitch between adjacent concave portions 12) of the outer cell 5 of the roll of the present embodiment is 10 times or less the minimum thickness tt of the outer cell on the bottom surface of the concave portion 12 13).

A crown is formed in the outer cell 5 in a wider range than the sheet contacting portion 2p (hereinafter, the range in which the crown is formed is referred to as a crown forming portion 15). The outer cell 5 is warped by the load when the sheet 2 is molded. Thus, by forming the crown in advance, a uniform linear pressure is obtained in a state where a load is applied to the forming roll 4a.

In the first embodiment, the crown is not formed in the entire area of the outer shell 5. A taper 17 for gradually reducing the outer diameter toward the end of the outer shell 5 is formed in a range where the crown from the end of the crown forming portion 15 to the end of the outer shell 5 is not formed. By forming the taper 17, end contact of the end of the forming roll 4a and the forming roll 4b (Fig. 1) is avoided.

3A and 3B show a guide wall 20 formed in the inner cell 6. 3A and 3B, the flow path 8c between the inner circumferential surface of the outer cell 5 and the outer circumferential surface of the inner cell 6 is arranged to be inclined with respect to the axial direction on the spiral along the circumference of the inner cell 6 A plurality of guide walls 20a are formed. The guide wall 20a is welded to the outer peripheral surface of the inner cell 6.

As shown in Fig. 3B, the guide walls 20a are formed in a round rod shape or a plate shape, and are dispersed and arranged regularly at a predetermined interval. In addition, the end face of the guide wall 20a is formed narrow in the form of a wedge, whereby the flow resistance of the temperature control liquid 7 is suppressed. The temperature control liquid 7 flowing through the flow path 8c is rectified, dispersed and stirred by the guide wall 20a to flow the temperature control liquid 7 to the entire roll.

In the first embodiment, as shown in FIG. 3B, a plurality of divided guide walls 20a are used, but as shown in FIG. 3B (b), a plurality of guides The wall 20b may be used. 3 (b), the guide wall 20a is formed by welding a circular rod or a plate to the outer peripheral surface of the inner cell 6, but the outer peripheral surface of the inner cell 6 may be cut Or may be integrally formed by processing. A predetermined gap S is secured between the inner wall of the outer cell 5 and the outer wall of the guide wall 20a and 20b,

The thickness of the inner cell 6 is formed to be thicker than the thickness of the outer cell 5 in order to maintain the rigidity of the entire forming roll at a high level because the thickness of the outer cell 5 is thin, And the shaft 9 are welded to each other.

Fig. 4 shows a sectional view (sectional view taken along the line C-C in Fig. 3A) of the forming roll 4a when cut at a plane parallel to the flange 10 on the operating side and passing through the center of the flow channel 8d. 6, six flow passages 8d are formed in the flange 10 from the center of the flange 10 to the outer periphery and are equally spaced from each other. The flow passages 8c, 8e communicate with each other. The drive-side flange 10 also has the same structure.

The temperature control of the outer periphery of the forming roll 4a is performed by circulating the temperature control liquid 7 flowing through the flow path 8c. Cooling water, warm water, or the like is used for the temperature control liquid 7, and the flow rate is adjusted to control the outer circumference of the forming roll 4a to a desired temperature. 2, the flow of the temperature control liquid 7 is first received from the outside by the rotary joint 16 provided on the operation-side shaft 9, and the flow path 8a formed at the center of the forming roll 4a And thus flows toward the driving-side shaft 9. And then flows into the flow path 8c through the flow path 8b formed in the flange 10 on the drive side and reaches the operating side from the drive side along the inner peripheral surface of the outer cell 5. [

The forming roll 4a has the concave portion 12 formed on the inner peripheral surface of the outer shell 5 and has a larger contact area with the temperature control liquid 7 than in the case where the concave portion 12 is not formed have. Therefore, the heat exchange between the outer cell 5 and the temperature control liquid 7 also increases.

A guiding wall 20 is formed on the outer peripheral surface of the inner cell 6 as a convex wall extending spirally along the axis of the inner cell 6. The guiding wall 20 is provided on the outer cell 5 and the inner cell 6, As shown in Fig. The guide wall 20 is arranged so as to be inclined in a spiral manner with respect to the axial direction of the inner cell 6 so that the temperature control liquid 7 disperses and swirls in the flow path 8c and flows on the spiral. As shown in Fig. 4, the flow path 8c communicates with the six flow paths 8d.

On the working end side of the shaping roll, the temperature control liquid 7 passes through the six flow paths 8d, passes through the outer circumferential flow path of the rotary joint 16 on the operating side, ≪ / RTI > The temperature control device has a function of keeping the temperature of the temperature control liquid 7 constant.

In the first embodiment, turbulence is generated because the temperature control liquid 7 flows at almost right angles to the extending direction of the concave portion 12. In general, turbulence is more likely to occur in the turbulent flow than in the laminar flow, and the heat transfer effect is high. Therefore, in the first embodiment in which the concave portion 12 is formed at almost right angles to the flow, efficient heat exchange is performed.

That is, in the first embodiment, the tempering ability of the forming roll 4a is increased due to the effect of increasing the contact area and the effect of causing turbulence.

The flow path 8c of the outer cell 5 has the guide wall 20a spirally arranged with respect to the axial direction of the forming roll as described above so that the temperature control liquid 7 can be rectified in the spiral direction, Dispersed and stirred. Therefore, the temperature control liquid 7 can be uniformly flowed throughout the roll.

3B, when the guide wall 20b has a spiral continuous guide wall 20b, the guide wall 20b has a double helical structure, The cross sectional area becomes narrow and the flow rate of the temperature control liquid 7 becomes faster, and the turbulent flow state can be obtained. Therefore, an effect of suppressing occurrence of temperature unevenness in the forming roll can be obtained by further increasing the cooling ability by the temperature control liquid 7.

In the forming roll of the present embodiment, since the action of stirring the temperature control liquid 7 is obtained by the labyrinth effect of the concave portion 12 on the inner peripheral surface of the outer shell 5, the guide walls 20a, The cooling ability of the forming roll can be further increased.

3A, the predetermined gap S formed between the outer circumferential surface of the guide walls 20a and 20b and the inner circumferential surface of the outer cell 5 easily deforms the outer cell 5 having a resilient thin structure, Is set to be larger than that of a general rigid roll, and is not less than the amount of deflection generated in the sheet forming roll at the time of molding. If the gap S is not ensured, the elasticity of the outer cell 5 is not sufficiently secured, so that the flexible sheet formability is lost.

The gap S is set to a dimension such that the inner peripheral surface of the outer shell 5 abuts against the guide walls 20a and 20b before permanent bending is generated when an excessive load is applied to the outer shell 5, The occurrence of breakage or deformation of the outer cell 5 is prevented, thereby preventing the outer cell 5 from being damaged.

Finally, the lubricant is discharged from the forming roll 4a through the flow path 8d formed in the operating-side flange 10, the flow path 8e formed in the operating-side shaft 9, and the like. Thereafter, the temperature control liquid 7 enters the temperature control device (not shown) via the outer peripheral flow path. The temperature control device has a function of keeping the temperature of the temperature control liquid 7 constant.

In the present embodiment, the axial width of the outer shell 5, which is the main dimension of the forming roll 4a, and the distance between the bearings 11 are 1400 mm and 1660 mm. The sheet contacting portion 2p (FIG. 3A) was set to 1170 mm.

The outer diameter and inner diameter of the outer cell 5 were 300 mm and 290 mm, and the thickness of the outer cell 5 was 5 mm. The outer diameter of the inner cell 6 was 270 mm and the distance between the outer cell 5 and the inner cell 6, that is, the distance between the flow channels 8c was 10 mm. The inner diameter of the inner cell 6 was 230 mm, and the thickness of the inner cell 6 was 20 mm. The inner cell 6 is thicker than the outer cell 5 in order to maintain the rigidity of the entire forming roll 4a.

The pitch P of the concave portion 12 was 4 mm and the depth of the concave portion 12 was 1.9 mm. The ratio of the cross-sectional area of the portion removed by the formation of the concave portion 12 to the portion left as the convex portion due to the formation of the concave portion 12 was set to 58%: 42%.

The sheet contact portion 2p on the outer circumferential surface of the outer shell 5 was subjected to mirror-surface finishing after chrome was plated on the surface. In addition, a general circular arc R curve is used as a crown formed in the crown forming portion 15. [ In the first embodiment, the diameter of the end portion of the outer shell 5 is set to be 1 mm smaller than the outer diameter of the end portion of the crown forming portion 15 as the taper 17.

The forming roll 4a constituted as described above is used for forming a thin sheet 2 having a thickness of from about 0.05 mm to about 1 mm and a nip pressure necessary for forming the sheet 2 is 100 N / cm.

Further, the forming roll 4b, which is the other side of the forming roll 4a shown in Fig. 1, can also be tempered as a double pipe structure capable of flowing the temperature control liquid 7 therein. The thickness of the outer shell 5 of the forming roll 4b is thicker than the thickness of the outer shell 5 of the forming roll 4a and hardly deformed by an assumed line pressure (for example, 100 N / cm) . Therefore, since the forming roll 4b can be regarded as a rigid roll, no crown is formed.

5A shows the sectional shape of the forming roll 4a when a linear pressure is applied to the forming roll 4a by the forming roll 4b. Fig. 5A can be obtained by combining the distortion distortion shown in Fig. 5B and the warping distortion shown in Fig. 5C together.

5B is a cross-sectional view showing the distortion a of the outer cell 5 when a load is applied from the point a of the outer periphery of the outer shell 5 toward the center (the direction of the white arrow). The outline indicated by the solid line is a shape when the load is applied, and the outline indicated by the dashed line is the shape when the load is not applied. In the outer cell 5, the point a at which the load is applied is distorted, and the outer cell 5 is deformed such that the point a is swollen by the distortion.

Therefore, the forming roll 4b and the forming roll 4a are not in contact with each other at one point, but the forming roll 4a comes into contact with the curved surface by the amount corresponding to the distortion deformation a. The width of contact between the forming roll 4b and the forming roll 4a is referred to as nip width 18 (Fig. 5 (a)).

Fig. 5 (c) shows the bending deformation e of the forming roll 4a when an even load is applied over the entire sheet contacting portion 2p of the outer cell 5. Fig. Fig. 5 (d) shows a bending deformation e along the axial direction of the forming roll 4a. As shown in Fig. 5 (d), the outer cell 5 has the maximum flexural strain e at the center in the axial direction, and generates the deflection e. 5C is a sectional view of the forming roll 4a at a position where the deflection deformation e is maximized when the deformation a is not taken into consideration. The center 5c of the outer cell 5 moves by the amount of deflection e.

In the present embodiment, since the thickness of the outer cell is as thin as 5 mm, most of the deformation is deformation a. In the first embodiment, the distortion a and the deflection deformation e at the central portion in the axial direction of the outer shell 5 are about 0.14 mm and 0.06 mm, respectively, and the distortion a ratio of the outer shell 5 is 70%.

The outer shell 5 of the forming roll 4a is significantly deformed at the center in the axial direction of the forming roll 4 and the forming roll 4b which is the other side of the forming roll 4a can be regarded as a rigid roll, . Therefore, the nip portion of the forming roll 4a at the time of the load load is made straight, so that the bending of the forming roll 4a and the forming roll 4b coincides with each other to form the nip. Therefore, the nip pressure can be made uniform over the axial direction by calculating the amount of bending by a predetermined load, and applying a crown corresponding to the amount of bending to the outer cell 5. [

In the first embodiment, the crown amount is formed by increasing the center radius of the forming roll by 0.2 mm. That is, the crown amount at the diameter is 0.4 mm. By applying the crown, a uniform linear pressure is obtained in the width direction of the forming roll 4a when the line pressure specified in the forming of the sheet 2 is applied. In addition, the forming roll 4b is a rigid roll having a large cell thickness, and warpage is negligible, so no crown is provided.

Next, the relationship between the longitudinal direction of the line-shaped concave portion 12 and the mechanical strength of the outer shell 5 will be described.

6A and 6B are views for explaining the relationship between the longitudinal direction in which the line-shaped concave portion 20 formed in the thin plate 19 extends and the ease of bending of the thin plate 19. Fig. The thin plate 19 is folded along the direction parallel to the longitudinal direction of the concave portion 20 by applying a force in a direction orthogonal to the longitudinal direction of the concave portion 20 as shown in Figure 6 (a) (In the case of folding in the direction of the white arrow along section B in Fig. 6 (a)), folding can be performed by a smaller force than a thin plate on which the line-shaped concave portion 20 is not formed . This is because the plate thickness is thin and the section modulus is small in the concave portion 20 positioned vertically with respect to the direction in which the force is applied.

6 (b), a force is exerted in a direction parallel to the longitudinal direction of the line-shaped concave portion 20, so that the thin plate 19 (see FIG. 6) is formed along the direction intersecting the longitudinal direction of the concave portion 20 (In the case of folding in the direction of the white arrow along the section A in Fig. 6 (b)), the case where the thin plate on which the recess 20 is not formed is folded and bent We need the same power. This is because the section modulus in the direction in which the force is applied is substantially equal to the section modulus of the thin plate on which the concave portion 20 is not formed.

Since the concave portion 12 shown in Fig. 3 is formed substantially along the circumferential direction on the inner circumferential surface of the outer shell 5, the concave portion 12 is close to the configuration shown in Fig. 6 (b). Therefore, the outer cell has the same rigidity as in the case where the concave portion is not formed.

Regarding the heat transfer, since the thickness of the outer cell is thinner at the portion where the recess is formed, heat is easily transmitted from the inner circumferential surface to the outer circumferential surface of the outer cell, and the temperature control capability is increased.

Since the outer surface of the outer shell 5 has a large surface area on the inner surface of the outer shell 5 due to the presence of the recess 12, the temperature control ability of the temperature control liquid 7 is increased.

In other words, in the first embodiment, while the stiffness of the outer cell 5 is maintained, the thickness of the outer cell 5 at the point where the recess 12 is formed and the thickness of the outer cell 5 and the temperature- And the swirling effect of the temperature control liquid 7 generated by the concave portion 12, the temperature control ability is increased.

Next, description will be made on non-uniformity of the thickness of the sheet during sheet forming, particularly nip pressure performance against longitudinal stripes of the sheet which are easily generated on the thin sheet.

7, since the concave portion 12 is formed in a ring-like shape extending round the inner periphery of the outer shell 5, the outer shell 5 can be deformed smoothly along the axial direction. 7A and 7B show a state in which the sheet 2 is cut at a plane perpendicular to the sheet 2 when the sheet 2 is sandwiched between the forming roll 4a and the forming roll 4b Fig. 7A shows an outer cell 5 having a concave portion 12 formed therein and FIG. 7B shows an outer cell having a uniform thickness.

7 (b), when the concave portion 12 is not formed, the outer cell 5 is integrally deformed, so that the uncompacted portion 24 is formed in the vicinity of the inflow of the molten resin, (Longitudinal stripes of the sheet) are easily generated. Since the uncompacted portion 24 is not subjected to the pressing of the outer peripheral surface of the outer cell 5, the outer appearance of the uncompacted portion 24 is different from that of the pressed portion, resulting in a streaky appearance of the sheet 2, .

It is difficult to uniformly discharge the molten resin from the T die 3 in the axial direction and the sheet 2 is thin so that the cooling is quick and the molding rolls 4A and 4B 4B, the flow of the molten resin in the axial direction is small, and the uncompacted portion 24 is likely to be generated in the sheet 2. 7A, the outer cell 5 is easily deformed in the direction orthogonal to the longitudinal direction of the concave portion 12 by forming the concave portion 12 in the outer cell 5, (24) can be eliminated. Further, according to the outer cell 5 having the concave portion 12, the thinner sheet 2 can be formed at high speed.

In the present embodiment, since the concave portion 12 is formed in a ring shape around the axis of the outer cell 5, the distortion a is small even when the outer cell 5 has the concave portion 12. Therefore, there is no need to increase the amount of crowns, and a forming roll having good formability with respect to longitudinal stripes of the sheet can be obtained.

[Comparison by bending curve]

Fig. 8 shows the formability of the forming roll 4a of the present embodiment with respect to longitudinal stripes of the sheet during sheet chewing, as compared with a conventional forming roll in which no concave portion is formed. In Fig. 8, the vertical axis represents the deflection amount, and the horizontal axis represents the axial length (roll width) of the forming roll. The bending curve is a curve obtained by plotting the amount of warping of the surface of the forming roll of the crown forming portion along the width direction of the forming roll by applying nip linear pressure to the surface of the forming roll. The formability (flexibility with respect to vertical stripe load) of the sheet longitudinal stripes is basically compared with a forming roll having the same crown amount only, that is, the warping amount in the width direction under the same linear pressure load condition.

The flexural curves shown in Fig. 8 were compared in the following three types of rolls as shown in Fig.

As shown in Fig. 9A, the outer cell of the shape (1) of the comparative example had no concave portion and was formed thick to the same extent as in the present embodiment. Corresponds to a shape in which the concave portion 12 is absent in the outer cell 5 of the shape 3 to be described later. In Fig. 8, the bending curve of the shape (1) of the comparative example is indicated by a one-dot chain line.

As shown in Fig. 9 (b), the outer cell of the shape (2) of the comparative example has no concave portion and is formed thinner than the present embodiment. Which corresponds to the forming roll described in Patent Document 1 described above. In Fig. 8, the bending curve of the shape (2) of the comparative example is indicated by a broken line.

As shown in Fig. 9C, the outer cell 5 of the shape 3 of the present embodiment has the concave portion 12, and is formed thicker than the shape (2). In Fig. 8, the bending curve of the shape (3) of the comparative example is shown by a solid line. The amount of deflection of the shape (3) of the present embodiment is almost the same as the amount of deflection of the shape (2) of the comparative example.

The shape (2) of the comparative example and the shape (3) of the present embodiment correspond to approximately the same crown amount. The shape (1) is shown as a reference example of the amount of deflection.

[Line pressure load condition]

A linear pressure load having a width of 10 mm and a length of 1300 mm x 100 N / cm was loaded on the forming roll of the first embodiment. Assuming the occurrence of longitudinal stripes of the sheet, the partial load was distributed in four points in the range of 320 mm in the center of the forming roll to load the concave / convex load, and the flexural flexibility of the forming roll was confirmed Respectively.

In other words, the convex load assumes the portion where the sheet exists, and the concave load assumes the portion where there is no sheet to reproduce the longitudinal stripes of the sheet.

A linear pressure load having a width of 10 mm and a length of 40 mm x 200 N / cm was uniformly dispersed as a partly uniformly dispersed load in a range of 320 mm in the central portion of the forming roll with four sets and a pitch of 80 mm. The average nip pressure within the range of 320 mm in the central portion is equivalent to 100 N / cm.

[Calculation result of bending amount]

As a calculation method, a deflection amount was calculated by an electronic calculator using a general finite element method.

The calculation results of the deflection amount are shown in Fig.

As shown in Fig. 8, three bending curves are shown. As shown by the arrow E, the curves bending up and down due to the load applied to the center are large, and the followability with respect to the partial load, Is superior in the deforming ability of the resin.

The shape (1) of the comparative example is such that the thickness of the outer shell is 4.6 mm and there is no concave portion. Therefore, the amount of warpage is about 1/2 of the shape (3) of the embodiment and the change in the amount of warpage , That is, the flexibility with respect to the vertical stripe load is small.

In the shape (2) of the comparative example, since the thickness of the outer shell is 3.5 mm and there is no concave portion, the amount of warpage is as large as the shape (3) of the embodiment and the change in the amount of deflection There is a great deal of flexibility in the vertical stripe load.

Although the thickness of the outer cell is 4.6 mm in the embodiment (3), the total amount of warpage is the same as the shape (2) of the comparative example because the concave portion is provided. The flexibility with respect to the stripe load is larger than the shape (2) in the comparative example, and flexibility with respect to the vertical stripe load is great. In other words, even in the case of forming rolls of the same crown amount, it is shown that the forming roll of the shape (3) of the embodiment is superior in flexibility to the vertical stripes load as compared with the shape (2).

The evaluation of the flexibility is basically compared with a forming roll having the same amount of warpage in the width direction of the sheet under the same linear pressure load condition.

[Other comparison]

Since the forming roll 4a is formed by welding the outer cell 5, the inner cell 6, the flange 10 and the shaft 9, the outer cell 5 and the inner cell 6 are rotated individually It is possible to rotate at a higher speed than the forming roll. According to the first embodiment, it becomes possible to use at a rotating speed of 100 m / min.

In the forming roll described in Patent Documents 2 and 3 in which the outer cell and the inner cell rotate individually, it is necessary to increase the mechanical strength at the sliding portions of the outer cell and the inner cell. That is, the mechanical strength in the sliding portion becomes the endurance load in this forming roll. Also, liquid leakage tends to occur at the sealed portions of the outer cell and the inner cell, which rotate individually. In the forming roll 4a according to the first embodiment of the present invention, since the outer cell 5 and the inner cell 6 rotate integrally, there is no sliding portion. Therefore, the allowable strength of the material can be the durability of the line pressure, and the durability is improved. In addition, durability is improved by using a metal, such as rubber or plastic, which is hardly used.

The rotary joint 16 can be used similarly to a general rigid roll in order to supply and discharge the temperature control liquid 7 to the forming roll of the present embodiment and there is no problem in the durability of the rotary joint 16. [

(Second Embodiment)

Next, the configuration of the forming roll 4a in the second embodiment will be described.

Fig. 10 is a detailed sectional view of an enlarged portion of the forming roll 4a from the central portion to the operating side in the second embodiment.

In the first embodiment, the concave portion 12 is formed as a continuous female thread. In the second embodiment, as shown in Fig. 10, the concave portion 12 is formed so as to be adjacent to the end portion of the concave portion 12 formed at the most flange 10 side A bypass groove 21 for bypassing the cutting edge is formed in a ring shape along the axis of the outer shell 5. By forming the bypass groove 21, the concave portion 12 can be easily processed.

When the concave portion 12 is formed, the cutting edge is moved from the inner side to the outer side in the radial direction of the outer shell 5 while the outer shell 5 is rotated around the axis. Thereafter, the concave portion 12 is machined by moving the cutting edge in the axial direction of the outer shell 5. It is possible to temporarily hold the cutting knife in the bypass groove 21 by forming the bypass groove 21 as in the second embodiment so that the timing for moving the cutting knife in the axial direction of the outer cell 5 . The bypass groove 21 may be formed at the center of the outer shell 5 in the axial direction.

When the length of the forming roll 4a is long, it is difficult to align the position of the cutting edge material when the recess 12 is formed. In this case, by forming the bypass groove 21 properly, it is possible to easily process the concave portion 12 even with the long forming roll 4a having a length of 2 m or more. By forming the bypass groove 21 at the end of the concave forming portion 12p and the axial center portion of the outer cell 5 in the long forming roll of 2 m or longer for example, So that it can be processed with good precision. The width of the bypass groove 21 in the axial direction is made as small as possible so that the mechanical strength of the entire outer cell 5 is prevented from being lowered and the rigidity and elasticity of the outer cell 5 are prevented from being uneven .

The concave forming width 12p is formed slightly larger than or equal to the sheet contacting portion (sheet width) 2p. The crown forming portion 15 is formed to be larger than the concave forming width 12p. In the second embodiment, the entire outer sheet 5 having the same structure as that of the first embodiment is in contact with the entire sheet width 2p, thereby achieving uniformity of heat transfer, nip pressure conditions, and the like. In the second embodiment, when the concave portion 12 is machined on the constituent material of the outer shell 5, the rotation position of the outer shell 5 and the timing of the feeding of the outer shell 5 can be matched with each other.

In the second embodiment, the axial length (the length of the long side) of the outer cell 5 is 2000 mm. By using the outer cell 5 having such a length, a forming roll having a long side of 2 m or more can be manufactured.

(Third Embodiment)

Fig. 11 (a) is a partial cross-sectional view of the outer cell 5 according to the third embodiment cut along a plane parallel to the axial direction. In the first and second embodiments, the cross-sectional shape of the recess 12 is formed in a trapezoidal shape. In the third embodiment, the cross-sectional shape of the recess 12 is a U-shaped inner surface, Shaped. By forming the U-shaped portion, the corners in the concave portion 12 are roundly formed in the shape of an arc, so that the stress concentration is reduced and the durability of the concave portion 12 can be enhanced. Further, the cross-sectional shape of the concave portion 12 is not limited, and there is no particular limitation. It should be noted, however, that the cross-sectional shape in which the cut-out coefficient of the valley portion becomes large, such as the so-called V-groove having the inner surface of the V-shaped phase, may be cracked and damaged.

(Fourth Embodiment)

Fig. 11 (b) is a partial cross-sectional view of the outer cell 5 according to the fourth embodiment cut along a plane parallel to the axial direction. In the fourth embodiment, the cross-sectional shape of the concave portion 12 is formed into a rectangular shape which is nearly rectangular. The rectangular recess 12 is formed so that its corner portions are formed in an arc shape, and the cut-out coefficient of each corner portion is not increased.

The maximum stress at the time of nip loading of the outer cell 5 occurs on the inner peripheral surface of the outer cell 5 and the area of the remaining ribs (convex portion) on the inner surface of the rectangular recess 12 is large, ) Of the outer shell 5 is lowered, and the safety factor of the strength of the outer shell 5 is increased, so that the life of the forming roll becomes longer.

The operation in the fourth embodiment is the same as that in the first embodiment, but since the cross-sectional shape of the recess 12 is a rectangular shape close to a rectangle, processing is simplified.

The depth of the concave portion 12 and the range of the pitch P of the concave portion 12 in the angled concave portion 12 of the outer shell 5 in the fourth embodiment will be described.

[Action]

The operation of the depth of the recess 12 will be described with reference to Figs. 12 (a) to 12 (c).

The depth D of the concave portion 12 of the outer shell 5 of the forming roll of the present embodiment is formed to be 0.1 times or more the thickness t of the outer shell 5 in the radial direction.

Figs. 12 (a) to 12 (c) show a variant example in which the angular recess 12 is an example and the depth t1 of the recess 12 is changed.

In the forming roll of the present embodiment, the main purpose is to ensure the flexibility of the forming roll by the concave portion 12 formed in the inner peripheral surface of the outer shell 5. Further, the forming roll of the present embodiment is intended to achieve uniformity of heat transfer to the sheet 2, and to improve the heat transfer performance.

In the use of a forming roll, particularly a touch roll, the linear pressure of the sheet is about 10 to 100 N / cm in the case of a light load roll, and about 100 to 500 N / cm in a heavy load roll. The thickness t1 in the radial direction of the outer shell 5 is varied in accordance with various combinations of the diameter, axial length, and line pressure of the forming roll, but is formed within a range of about 2 mm to 20 mm.

As the depth of the recessed portion 12, for example, as shown in Figs. 12 (a) to 12 (c), a configuration example formed of the dimensions D1, D2, and D3 is exemplified.

[Deep concave]

As shown in Fig. 12 (a), the concave portion 12 formed relatively deeply at the depth D1 is a relatively thin forming roll for a sheet. The thickness t1 of the outer cell 5 is set to 4 mm and the depth td of the concave portion 12 is formed to be about 3 mm in order to sufficiently obtain the flexibility of the outer cell 5. In this case, do.

Although the depth td (= D1) of the concave portion 12 is 0.75 times the thickness t1 of the outer cell 5 in this configuration example, the depth td of the concave portion 12 is 0.9 And the upper limit of the depth td of the concave portion 12 is not particularly limited.

With this deep concave portion 12, the shape of the peripheral surface of the forming roll can be maintained in a circular shape and the outer cell 5 can be thinned. For example, a large forming roll having a length of 2 m or more is manufactured There is an effect that is possible.

[Shallow recess]

As shown in Figs. 12 (b) and 12 (c), a depth range effective as the concave portion 12 formed to be relatively shallow is described.

12 (b) and 12 (c), as an example of a structure that sufficiently obtains the flexibility of the outer cell 5 in the concave portion 12 which is relatively shallow at the depth D2, The thickness t1 is 5 mm and the depth td (= D2) of the concave portion 12 is 1 mm and the depth td of the concave portion 12 is 0.2 times the thickness t1 of the outer cell 5, The width of the concave portion 12 with respect to the concave portion 12 is set to 1/2 of the pitch P of the concave portion 12. In the case of this configuration, with respect to the value of the moment of inertia I of the outer shell 5, the cross section parallel to the longitudinal direction of the concave portion 12 and the length of the concave portion 12 (Cross section in the width direction) orthogonal to the direction.

As a result of comparison, when the concave portion 12 is provided, the value I of the moment of moment of inertia of the cross section in the cross section parallel to the longitudinal direction of the concave portion 12 is reduced to 52% The value I of the moment of moment of inertia of the cross section at the cross section at the end face of the concave portion 12 is reduced to 78% and the effect of reducing the bending along the longitudinal direction of the concave portion 12 is large. As a result, flexibility can be imparted to the outer cell 5 having the concave portion 12. There is also a portion where the concave portion 12 is not formed in the section parallel to the longitudinal direction of the concave portion 12 but the effect of decreasing the value of the sectional moment of inertia I by the concave portion 12 is And can be determined by the value I of the moment of inertia of the cross section due to the recess 12 remaining as a whole in the outer shell 5 as a whole.

Therefore, even if the concave portion 12 having a depth of 1 mm, which is 0.2 times the thickness t1 of the outer cell 5, has the effect of imparting flexibility to the outer cell 5 and has sufficient depth as the depth of the concave portion 12, Even if it is 0.1 times the thickness t1 of the substrate 5, the flexibility is obtained.

In the case of the concave portion having a depth of 0.5 mm which is 0.1 times the thickness t1 of the outer shell 5 and is the same as described above, the value of the moment of inertia of the cross section in the cross section parallel to the longitudinal direction of the concave portion 12 When the value I of the second moment of inertia at the cross section orthogonal to the longitudinal direction of the concave portion 12 is reduced to 89% so as to bend along the direction parallel to the concave portion 12 . In other words, the degree of concave of the depth that is 0.1 times the thickness t1 of the outer cell 5 also provides the effect of imparting flexibility to the outer cell 5.

The effect of improving the heat transfer performance by increasing the contact area with the temperature control liquid 7 in the concave portion 12 of the outer shell 5 is the same as that of the concave portion 12 as shown in Fig. Even if the depth of the concave portion 12 is shallow, the pitch P of the concave portion 12 is made small, so that the contact area with the temperature-increasing liquid increases. However, since the primary object of the present invention is to improve the flexibility with respect to the axial direction of the outer cell 5, the flexibility of the outer cell 5 is preferentially secured.

Although a molding roll of an ultra-thin sheet having a thickness of about 50 占 퐉 is described as an example with respect to the depth of the concave portion 12, a thin sheet having a thickness of about 0.1 mm is subjected to a high load at a nip pressure of about 300 N / Even in the case of a heavy-load roll, the present embodiment can be applied in the same manner, which is effective for imparting flexibility. Therefore, the depth of the concave portion 12 in the present invention may be at least 0.1 times the thickness t1 of the outer shell 5.

[Action]

The operation of the concave portion 12 with respect to the pitch P will be described.

The outer cell 5 of the forming roll of the present embodiment is formed so that the pitch P of the concave portions 12 (the pitch between the adjacent concave portions 12) is smaller than the pitch P of the outer cells 5 on the bottom surface of the concave portion 12 10 times the minimum thickness tt in the radial direction.

Figs. 13 (a) to 13 (c) show various modifications of the pitch P of the concave portion 12 by taking a rectangular concave portion as an example.

As described above, in the forming roll of the present embodiment, the main purpose is to secure the flexibility of the forming roll by the concave portion 12 formed on the inner peripheral surface of the outer shell 5. Further, the forming roll of the present embodiment is intended to achieve uniformity of heat transfer to the sheet 2, and to improve the heat transfer performance.

It is preferable that the linear pressure of the sheet 2 is about 10 to 500 N / cm and the thickness t1 in the radial direction of the outer shell 5 is about 10 to 500 N / cm, as described above with respect to the depth of the concave portion 12, It is about 2 mm to 8 mm. The pitch P of the concave portion 12 is an example of the configuration of P1, P2, and P3.

[Small pitch]

As shown in Fig. 13A, by making the pitch P small as in the concave portion of the pitch P1, the flexibility and the heat transfer characteristic of the forming roll can be made even more uniform in the axial direction of the forming roll. However, by making the pitch P of the concave portion 12 small, the processing time of the concave portion 12 becomes long, resulting in an increase in manufacturing cost.

In the first embodiment described above, the minimum thickness tt of the outer cell 5 is 3.1 mm, the thickness t1 of the outer cell 5 is 5 mm and the pitch P is 4 mm (pitch P / thickness t1 of the outer cell 5) ) Is 0.80, which is relatively low. The ratio of (pitch P / minimum thickness tt of outer cell 5) is 1.29.

[Large pitch]

As shown in Figs. 13 (b) and 13 (c), by increasing the pitch P, the concave portion 12 can be easily machined. However, There is a possibility that unevenness may occur. The ratio of the concave portion 12 of the pitches P2 and P3 (pitch P / thickness t1 of the outer cell 5) shown in Figs. 13 (b) and 13 (c) is about 1.3. The ratio of (pitch P / minimum thickness tt of outer cell 5) is 3.2.

In the design of the forming roll in the current situation, even if the minimum thickness tt of the outer cell 5 is 1.0 mm, the thickness t1 of the outer cell 5 is 8 mm, and the pitch P is about 10 mm, it is sufficiently feasible. In the case of this configuration, the ratio of (pitch P / thickness t1 of the outer cell 5) is about 1.25, which is relatively a shelter value. The ratio of (pitch P / minimum thickness tt of outer cell 5) is 10. In this case, as an index for setting the pitch P, it is convenient to use the ratio of the pitch P / the minimum thickness tt of the outer cell that affects the occurrence of thermal unevenness.

Therefore, the ratio of the pitch P of the concave portion 12 in the present invention (pitch P / minimum thickness tt of the external cell 5) may be 10 times or less.

(Fifth Embodiment)

The shape of the concave portion 12 shown in Fig. 14 aims at preventing excessive cooling of the remaining rib (convex portion). The concave portion 12 is provided for obtaining the flexibility in the axial direction of the outer cell 5 or in the case where the remaining ribs on the inner peripheral surface of the outer cell 5 are excessively cooled, Unevenness occurs in the axial direction. Therefore, in the present embodiment, heat transfer from the remaining ribs of the concave portion 12 is cut off, and unevenness in heat transfer performance is reduced. By reducing the thickness of the remaining ribs in the axial direction of the outer shell 5, the cross-sectional area of the heat transfer from the tip of the remaining ribs is reduced and the remaining ribs are prevented from being excessively cooled.

Therefore, as shown in Fig. 14, the width Wb of the bottom surface of the concave portion 12 of the present embodiment is formed to be larger than the width Wa of the tip end of the remaining rib, which is the width between adjacent concave portions 12. When the concave portion 12 is machined, the cutting of the concave portion 12 is performed by moving the cutting knife in the L-shaped cross section shown in Fig. 14 in the axial direction of the outer cell 5. It can be processed into a shape that widens toward the bottom surface side (outer side in the radial direction of the outer shell 5) inside the concave portion 12. [

(Sixth Embodiment)

The concave portion 12 may be formed by combining a plurality of shapes. Fig. 15 shows a cross-sectional view of a configuration example of the recess 12 of the outer shell 5 in the sixth embodiment. As shown in Fig. 15, two screw-type concave portions 12a and two trapezoidal concave portions 12b are alternately arranged so as to be alternately arranged, and a pair of rectangular-shaped concave portions 12a and a trapezoidal concave portion 12b 12b are pitch P between adjacent concave portions, and concave portion leads PP are formed. The two types of rectangular recesses 12a and the trapezoidal recesses 12b have different depths, widths in the axial direction, and shapes of the recesses 12, The flexibility of the outer cell 5 can be secured as in the first and second embodiments.

The forming direction in which the concave portion 12 extends may be an oblique direction with respect to the axial direction of the outer shell 5. That is, the concave portion 12 is formed as a female thread of a multi-threaded screw. By making the direction in which the recess 12 extends, relative to the axial direction, the groove portion and the crest portion come into contact with each other at the contact portion with the forming roll 4b, so that the rotation of the forming roll becomes smooth. This is the same principle that the helical gear rotates more smoothly than the spur gear.

By arranging the concave portion 12 so as to be inclined with respect to the axial line, it is possible to adjust the rigidity of the outer shell 5 and the spring constant in the cross-sectional direction orthogonal to the axial line and in the cross-sectional direction parallel to the axial line, The degree of freedom in designing the roll is improved, and a forming roll having various properties can be obtained. For example, a touch roll having a large nip width can be manufactured.

(Seventh Embodiment)

As shown in Fig. 16, the outer cell 5 may be configured to be fitted with respect to the shaft 9 so that the outer cell 5 can be attached to and detached from the roll body.

It is possible to constitute a plurality of types of linear forming rolls by attaching and detaching the outer cell 5 to and from the roll body so that only the outer cell 5 can be replaced when the surface of the outer cell 5 is damaged.

The outer cell 5 is inserted in the axial direction from the operating side of the outer cell 5 with respect to the shaft 9 and fixed to the flange 10 with the fixing bolt 29. [ A seal 35 such as an O-ring is disposed on both end surfaces of the outer shell 5 to prevent the leakage of the temperature control liquid 7 by the seal 35. [ By preparing two types of outer cells 5 and exchanging the outer cells 5, it is possible to reduce the manufacturing cost of the forming rolls as compared with the case of manufacturing a plurality of forming rolls.

Since the outer diameter of the outer cell 5 on the operation side is the same as the outer diameter of the molded portion of the sheet 2, the operator can visually check the nip roll state to check the presence or absence of the bank It is convenient because it is. The outer diameter of the drive side (motor side) of the outer cell 5 is larger than the outer diameter of the operation side to fix the outer cell 5 to the flange 10. [

The length of the operating side of the outer cell 5 can be made by aligning the end face in the longitudinal direction (axial direction) with the forming roll as the mating side. It is not necessary to form the operation side long, but the drive side is in contact with the forming roll which is the other side, so that only the portion of the flange 10 is formed long.

In the above-described first to sixth embodiments, the two-roll rollers, that is, the outer cell 5 and the inner cell 6 are provided. However, the inner rollers 6 may not be provided.

As shown in Fig. 16, the forming roll of the seventh embodiment has the shaft 9 for supporting the cell 5 corresponding to the outer cell 5 in the above-described embodiment without the inner cell 6 . On the inside of the forming roll, a guide wall 20 is formed on the circumferential surface of the shaft 9 so as to extend spirally along the axis.

In the configuration shown in Fig. 16, the shaft 9 is constituted as one shaft which passes through the cell 5 in the axial direction, but it may be constituted by connecting a plurality of divided shaft portions. In this configuration, the shaft portion located at the center of the forming roll is a structure in which the cell 5 is only connected. This configuration is preferable when it is applied to a forming roll having a relatively large diameter and a relatively short axial length.

In this configuration, the thickness of the cell 5 is relatively large, and can be applied, for example, to a forming roll having a relatively high linear pressure of about 300 to 500 N / cm. This configuration may be applied to a cast roll instead of a touch roll.

The cell 5 in the seventh embodiment has a larger diameter and a larger surface area than those of the first to sixth embodiments, thereby enhancing the temperature control capability. It is suitable for forming rolls requiring high speed and high cooling capacity such as cast rolls for forming BOPP (Bi-oriented Polypropylene: biaxially oriented polypropylene). When the forming roll in the sixth embodiment is used, the thickness of the sheet 2 is 0.15 mm to 0.8 mm and the forming speed is 120 m / min.

(Eighth embodiment)

The heating and cooling method of the forming roll of the present embodiment is not limited to the heating and cooling method using the above-described temperature control liquid 7, but may be applied to other heating and cooling methods using electric induction, gas and gas-liquid mixed fluids, And a heat and cooling method in which heat pipe liquid as a temperature-controlled fluid is sealed and heat exchange is indirectly performed through the heat pipe liquid.

[Gas heating method]

In the embodiment described above, the temperature-controlled liquid 7 is used, but a gas may be used. The concave portion 12 of the outer shell 5 of the above-described embodiment functions also as a so-called heat exchange fin, so that the temperature control capability is obtained even if a gas is used. When a gas is used as the warming fluid, it is preferable to increase the flow rate as compared with the case of using a liquid.

[Two-step warming method]

In the above-described embodiment, the temperature of the forming roll is regulated by directly directing the temperature-controlled fluid such as liquid or gas into the space on the inner circumferential side of the outer cell 5. However, for example, The first temperature fluid and the second temperature fluid may be used in the space on the side of the first temperature fluid and the temperature of the forming roll may be adjusted by indirectly exchanging heat between the first temperature fluid and the second temperature fluid.

17 shows a cross-sectional view of a configuration example of the forming roll of the eighth embodiment. As shown in Fig. 17, in the forming roll of the seventh embodiment, a cylindrical partition cell 30 as a separate cell in which the temperature control liquid 7 as the first tempering fluid is internally circulated is provided inside the outer cell 5 Respectively. In the present embodiment, the heat pipe liquid 31, which is a gas-liquid mixed fluid, is sealed as the second temperature fluid between the inner peripheral surface of the outer shell 5 and the outer peripheral surface of the partition cell 30. [ The heat pipe liquid 31 is sealed so as to fill, for example, about 2/3 of the space volume between the outer shell 5 and the partition cells 30. [ A spiral guiding wall 20b is formed on the outer periphery of the shaft 9 so that the temperature control liquid 7 flowing in the partitioning cell 30 is stirred.

The outer cell is provided with plugs 32a and 32b communicating with the space between the outer cell 5 and the cell shell 30 so as to be able to inject, discharge and seal the heat pipe liquid 31. [ If necessary, a pressure gauge may be disposed in the vicinity of the plugs 32a and 32b. By detecting the pressure in the space in which the heat pipe liquid 31 is sealed, the presence or pressure of the gas in the space and the pressure can be controlled .

The space filled with the heat pipe liquid 31 in the structure shown in Fig. 17 is not filled with the heat pipe liquid 31 directly in the space. Instead of filling the space with the heat pipe liquid 31 ) May be sealed so that a plurality of pressure-resistant structures are arranged and the periphery thereof may be filled with the temperature control liquid 7. In the case of this configuration, as the temperature control liquid 7, a liquid such as water or oil which does not cause a gas-liquid change at the use temperature of the forming roll is selected, and the pressure control of the tubule or the like can be performed with a simple configuration.

According to the forming roll of the present embodiment, as in the above-described embodiment, it is possible to obtain flexibility and to obtain uniform temperature characteristics in the axial direction of the outer peripheral surface of the outer shell 5 using the uniform temperature performance of the heat pipe liquid 31 Is obtained.

 (Other Embodiments)

In the first embodiment, the concave portion 12 is extended in a helical pattern like a single screw, but a plurality of ring-shaped concave portions extending to draw a circle may be formed. In this case, a complete axisymmetric structure is obtained around the axis of the forming roll 4a, and the deviation of the mechanical strength of the outer shell 5 is reduced. By reducing the depth of the concave portion corresponding to the small concave portion 13 step by step and changing the mechanical strength of the outer cell 5 stepwise, the stress at the boundary where the concave portion starts to be formed can be relaxed .

1 is applied to the forming roll 4a in which the sheet 2 is not wound, but the forming roll 4b on which the sheet 2 is wound is not limited to the above- . In the first to seventh embodiments, an example of the thickness of the sheet to be formed has been described. However, the present invention is not limited to the above-described sheet for forming thickness.

Further, the forming roll of the present embodiment may be applied to a roll other than the forming roll of the sheet.

Since the forming roll of the present embodiment is excellent in cooling and heating ability, a roll requiring heating, preheating, and cooling other than the roll for sheet forming, such as a dryer roll of a paper making apparatus, Of other industrial rolls.

1: Molding device
2: Sheet
4a, 4b, 4c:
5:
6:
7:
8a, 8b, 8c, 8d, 8e:
12:

Claims (16)

A cylindrical outer cell for press-forming the sheet,
And a cylindrical inner cell disposed inside the outer cell and having an outer diameter smaller than an inner diameter of the outer cell,
Wherein the outer cell is temperature-controlled by a temperature-controlled fluid flowing through a space between the outer cell and the inner cell,
A plurality of female screw recesses or ring-shaped recesses extending in the axial direction of the outer shell are formed on an inner peripheral surface of the outer shell over a wider range than a contact portion of the outer shell,
Wherein the pitch of the concave portion does not change within the range and is not more than 10 times the thickness in the radial direction of the outer cell on the bottom surface of the concave portion. The method according to claim 1,
Wherein a convex wall extending in a spiral manner is formed on an outer peripheral surface of the inner cell along an axis of the inner cell, and a flow path through which the heating fluid flows is formed by the convex wall,
A predetermined gap is formed between the tip of the convex wall and the inner peripheral surface of the outer cell,
Wherein the predetermined gap is equal to or greater than a deflection generated in the sheet forming roll at the time of forming. 3. The method of claim 2,
Wherein the convex wall is divided into a plurality of portions along the circumferential direction of the inner cell and arranged at intervals. A cylindrical cell for press-forming the sheet,
And a shaft supporting the cell,
Wherein the cell is temperature-controlled by a temperature-controlled fluid flowing through a space between an inner peripheral surface of the cell and the shaft,
A plurality of female screw recesses or ring-shaped concave portions extending along the circumference of the cell are formed in the inner peripheral surface of the cell over a wider range than the contact portion of the seat in the axial direction of the cell,
Wherein the pitch of the concave portion does not change within the range and is not more than 10 times the thickness in the radial direction of the cell on the bottom surface of the concave portion. 5. The method according to any one of claims 1 to 4,
Wherein the outer cell or the cell has a small recess on both sides of the range in which the recess is formed with respect to the axial direction of the outer cell or the cell, the recess being smaller in depth than the recess. 5. The method according to any one of claims 1 to 4,
Wherein the heating fluid is a base. 5. The method of claim 4,
And a separate cell disposed in a space between the cell and the shaft and through which the temperature-controlled fluid flows,
Wherein a gas-liquid mixed fluid is enclosed in a space between an inner peripheral surface of the cell and an outer peripheral surface of the separate cell. 8. The method according to any one of claims 1 to 4 and 7,
Wherein the cross-sectional shape perpendicular to the longitudinal direction of the concave portion is formed in a trapezoidal shape in which the width orthogonal to the longitudinal direction is smaller toward the bottom surface of the concave portion. 8. The method according to any one of claims 1 to 4 and 7,
Wherein the cross-sectional shape orthogonal to the longitudinal direction of the concave portion is a shape having a U-shaped inner surface or a square shape. 8. The method according to any one of claims 1 to 4 and 7,
Wherein the cross-sectional shape orthogonal to the longitudinal direction of the concave portion is formed so that the width of the bottom surface of the concave portion is larger than the width between the adjacent concave portions in a direction perpendicular to the longitudinal direction. 8. The method according to any one of claims 1 to 4 and 7,
Wherein the concave portion includes a plurality of types of concave portions differing in pitch, shape and depth from each other between adjacent concave portions. 8. The method according to any one of claims 1 to 4 and 7,
Wherein the concave portion is plated on an inner surface thereof. 8. The method according to any one of claims 1 to 4 and 7,
Wherein the outer cell or the cell has a crown. 8. The method according to any one of claims 1 to 4 and 7,
Wherein the outer cell or the cell is configured to be freely attachable to and detachable from the outer cell or the shaft supporting the cell. A sheet molding method for molding a sheet by sandwiching a molten resin between the sheet forming rolls according to any one of claims 1 to 4. delete

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