JP2000109252A - Worm roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase roll length and to prevent a meandering of a sheet in use under high speed rotation by forming spiral grooves sorting in a roll central part in the opposite directions so that each lead angle and width are gradually increased toward each end part. SOLUTION: Spiral grooves 15, 17 are sorted in a roll central part 13 in the opposite directions, while their rising tip parts are not connected together but formed slightly apart. The spiral grooves 15, 17 are formed so that their groove width and the absolute values of their lead angles are gradually increased toward both end parts 11a, 11b from the sorted part. In this case, the lead angle means a crossing angle θ between a line 20 orthogonal to a rotation axial line 19 of a roll main body 10 and a line 21 in the spiral groove.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extending wrinkles of a paper layer during a paper making process, preventing meandering of a sheet during continuous transport of the sheet, and removing wrinkles when winding the sheet. The present invention relates to a worm roll used for extending (a so-called wrinkle extending roll, also called an expander roll).

[0002]

2. Description of the Related Art Conventionally, in a papermaking calender roll or the like, as the roll length becomes longer, wrinkles tend to occur in the direction of exposing the paper layer. As a worm roll for extending these wrinkles, there is known a roll in which a spiral groove is formed in a central portion of a roll main body so that the direction is reversed. Further, a roll is known in which a new spiral groove is added stepwise as the spiral groove approaches both ends, and the absolute value of the lead angle (θ) is further increased. For example, such a roll includes a roll for elongating wrinkles of a sheet-like material described in JP-A-8-175726.

In the roll described in the above-mentioned publication, by gradually adding spiral grooves toward both ends, the action of catching the sheet-like material can be increased closer to both ends without reducing the widening action. Further, by forming the lead angle (θ) of the spiral groove such that the absolute value of the lead angle (θ) increases as the position approaches the both ends, it is possible to increase the side effect of the sheet-like material.

[0004]

However, the roll described in the above publication can extend wrinkles not only near the center of the roll but also at the end of the roll as compared with the roll having a single groove, but the groove shape is constant. For this reason, when used in high-speed rotation, meandering of the sheet is prevented, and the effect of extending wrinkles is not always sufficient. In addition, since spiral grooves are added stepwise toward both ends, there is a problem that wrinkles cannot be sufficiently extended at the center of a thin sheet such as an ultrathin film.

The present invention has been made in view of such a situation, and provides a worm roll which can not only prevent the sheet from meandering even when used at high speed but also sufficiently extend wrinkles even when used at high speed. The purpose is to do.

[0006]

The present invention has the following configuration to achieve the above object. That is, the worm roll according to the present invention forms a spiral groove which is distributed at the center of the roll and has opposite directions, and gradually adjusts the lead angle of the spiral groove and the width of the spiral groove toward both ends of the roll. It is characterized in that it is formed so as to be larger. The width of the spiral groove may be gradually increased by forming the angle of the side surface of the spiral groove closer to the roll end portion to gradually increase toward the both end portions of the roll. . Further, the width of the spiral groove is 1 to 20 mm.
And the rate of change is preferably 1 to 3%. The spiral groove may be formed so that its depth gradually increases toward both ends of the roll.
The depth of the spiral groove is 0.5 to 5 mm, and the change rate is 1 to 3%.

[0007] The spiral groove forms a spiral groove which is distributed at the center of the roll and whose direction is reversed.
The lead angle of the spiral groove, the width and the depth of the spiral groove may be gradually increased toward both ends of the roll. Further, by forming the angle of the side face near the roll end of the side face of the spiral groove so as to gradually increase toward the both ends of the roll, the width and depth of the spiral groove are increased toward the both ends of the roll. You may form so that it may become large gradually. Further, the width of the spiral groove is 1 to 20 m.
m, depth is 0.5 to 5 mm, and the rate of change is 1 to
Preferably, it is 3%. In the case where the spiral groove is composed of a plurality of grooves, it is preferable that the rising front end portion at the center of the roll is formed at an equal interval on the same circumference. The start pitch of the spiral groove is 5 to 20 m.
m, and the pitch change rate is preferably 0.5 to 25%, and is preferably increased by 1% for each rotation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiment will be described below in detail. FIG. 1 is a front view of a worm roll according to the present invention, in which a coating layer 11 coated with a rubber material is provided on the surface of a conventional metal roll body 10, and a central portion 13 of the roll body is provided on the surface of the coating layer 11. Are formed in spiral grooves 15 and 17 whose directions are reversed. The roll main body 10 may be a pipe-shaped roll core conventionally used. The spiral grooves 15 and 17 are located at the center 1 of the roll.
3, the leading ends are formed slightly apart without being connected, but the leading ends of the spiral grooves 15 and 17 are connected and V
It may be formed continuously in a letter shape.

The spiral grooves 15 and 17 are formed so that the groove width gradually increases from the distribution portion toward both ends 11a and 11b, and the absolute value of the lead angle increases. The shape of the groove may be any shape as long as the opening is larger than the bottom, and may be determined as an arbitrary groove such as a square groove, a V-shaped groove, or a U-shaped groove. The lead angle is the intersection angle θ between the line 20 perpendicular to the rotation axis 19 of the roll body 10 and the line 21 in the spiral groove, and the spiral grooves 15, 17 gradually lead toward both ends 11a, 11b. As the angle θ increases, the degree of inclination increases. The spiral grooves 15, 17 are formed such that the outer surface angles near both ends 11a, 11b gradually increase toward both ends 11a, 11b.

The spiral grooves 15 and 17 are shaped like V-shaped grooves 1
5a and 17a and a case where only the groove width is gradually increased will be described in detail with reference to FIG. In FIG.
(A)-(c) shows that the groove width changes from the center of the roll toward the end of the roll. The rotation axis 19 of the roll body 10 is provided at the bottom of the V-shaped grooves 15a and 17a.
Are provided at right angles.

For example, in the V-shaped grooves 15a and 17a in the first round from the distribution portion, the angle of the groove wall closer to the roll center portion 13 (half the left side from the perpendicular 23 in FIG. The length of the side wall is T1, the width thereof is L1, and the angle of the side wall near both ends 11a and 11b (the right half from the perpendicular 23 in FIG. 2A) is δ2, and the side wall length is T2. The width is L2, and the depth of the groove is H.

Next, the V-shaped groove 1 in the second round from the distribution portion
At 5a and 17a, the roll is closer to the center 13 (FIG. 2).
Assuming that the angle of the side wall (left half from the perpendicular 23 in (b)) is δ1 and the length of the side wall is T1, the width is L1. On the other hand, the angle of the side wall near both ends 11a and 11b (the right half from the perpendicular 23 in FIG. 2B) is δ3, the length of the side wall is T3, the width is L3, and the depth of the groove is H.

Further, in the V-shaped grooves 15a and 17a on the third lap from the distribution portion, the center of the roll 13 is shifted (FIG. 2).
The angle of the side wall of the left half from the perpendicular 23 of (c) is δ1, the length of the side wall is T1, the width is L1, and both ends 11a and 11b are closer (the perpendicular 23 in FIG. 2 (c)).
The angle of the side wall (right half from the left side) is δ4, the length of the side wall is T4, the width is L4, and the depth of the groove is H.

In the above structure, when the depth H of the groove does not change and the side wall length is formed so as to satisfy T1 ≦ T2 <T3 <T4, L1 ≦ L2 <L3 <L4, and the angle of the side wall is δ1 ≦ δ2. <Δ3 <δ4. That is, the V-shaped groove 15
a and 17a are formed so that the width of the groove gradually increases toward both end portions 11a and 11b, and the angle δ1 of the side wall near the roll central portion 13 is constant, but the angle of the side wall near the roll end portion is constant. The angles δ3 and δ4 are formed so as to gradually increase.

As described above, both ends 11a, 11b
By gradually increasing the width of the groove toward the end, the flow of air is increased at both ends than at the center, so that a rapid flow to the outside is generated.
When the angle of the side wall near the roll end is gradually increased, the air flow becomes even faster. Therefore, the wrinkles are quickly sent to both ends, and a smooth widening action can be obtained. In the above embodiment, the groove width is gradually increased by gradually increasing the angles δ3, δ4 of the side walls near the roll end portions 11a, 11b, but the angles of δ3, δ4 are the same as the angle of δ1. By doing so, the angles of the side walls on both sides of the perpendicular 23 may be made equal. In this case, the groove width may be gradually increased by gradually increasing the angle on both sides of the perpendicular.

The spiral groove preferably has a groove width of 1 to 20 mm and a change rate of 1 to 3%. When the groove width is smaller than 1 mm and the rate of change is 1% or less, the feeding action at the edge of the groove cannot be sufficiently obtained, and when the groove width is 20 mm and the rate of change is 3% or more, the sheet-like material has a small width. The depression becomes large and causes wrinkles.

The start pitch of the first lap from the distribution portion is 5 to 20 mm, and the pitch change rate is 0.5 to 2 mm.
It is preferably set to 5%. If the start pitch is 5 mm or less and the pitch change rate is 0.5% or less, it is not possible to obtain a sufficient widening effect by gradually increasing the lead angle θ toward both ends, and conversely, if the start pitch is 20 mm or more, If the pitch change rate is 5% or more, wrinkles in the central portion are not sufficiently extended, and the pitch is too large to sufficiently capture the wrinkles.

FIG. 3 shows a case where the spiral grooves 15 and 17 are formed as inverted trapezoidal square grooves 15b and 17b. The square grooves 15b and 17b are formed by forming the bottoms of the V-shaped grooves 15a and 17a horizontally and making the angles of the side walls of the grooves small.
Similarly to the V-shaped grooves 15a and 17a, the width of the groove is gradually increased toward both ends 11a and 11b in the square grooves 15b and 17b while keeping the angle of the side wall near the roll center 13 constant at δ5. , The angle δ of the side wall closer to 11b
7, δ8 are formed gradually larger.

That is, in the above configuration, the width of the bottom portion is kept constant, the groove depth H does not change, and the length of the side wall is T7 ≦ T8 <T.
When formed to satisfy 9 <T10, L1 ≦ L2 <L5
<L6, and the angle of the side wall is δ5 ≦ δ6 <δ7 <δ8. That is, the square grooves 15b and 17b are formed at both ends 11a and 1b.
1b, the width of the groove gradually increases, and the angle δ5 of the side wall closer to the roll central portion 13 is constant, but the angles δ7, δ8 of the side wall closer to both ends gradually increase. The length of the side wall gradually increases. With the above configuration, the square grooves 15b and 17b are V-shaped grooves 15a and 1b.
The same operation and effect as those of 7a can be obtained.

In the above embodiment, the case where the depth of the spiral groove is kept constant and only the width is gradually increased toward both ends has been described. Contrary to the above embodiment, the width of the spiral groove is reduced. It may be formed such that only the depth is made constant and gradually increases toward both ends. Groove depth at both ends 11
Even when the air is formed so as to gradually increase toward a and 11b, the flow of air is larger at both ends than at the center, so that a rapid flow to the outside is generated. The spiral groove preferably has a depth of 0.5 to 5 mm and a change rate of 1 to 3%. If the depth of the groove is smaller than 0.5 mm and the rate of change is 1% or less, the feeding action at the edge of the groove cannot be sufficiently obtained, and the depth of the groove is larger than 5 mm and the rate of change is 3% or more. Then, the sheet-like material is greatly dropped into the groove and causes wrinkles.

Next, an embodiment in which only the groove depth is changed without changing the groove width will be described with reference to FIG. 4. The depth of the groove is H <H1 <H2, and the width of the groove is constant. To L5
<L3 <L1 ≦ L2>L4> L6, and the side length is T
1 ≦ T2 <T12 <T14, T1 ≦ T2 <T13 <T1
5. The angle of the side surface is δ10 <δ9 <δ1 ≦ δ2>δ3> δ
It becomes 4.

Further, by combining the above embodiments, the width and the depth of the spiral groove may be formed so as to gradually increase toward both ends 11a and 11b. FIG. 5 shows the relationship between the groove width and the depth in this case. In FIG. 5, the groove width is L1 ≦ L2 <L3 <L5, L1 ≦ L2 <L4 <L6, and the groove depth is H <H1 <. H2 and the side length is T
When formed so that 1 ≦ T2 <T5 <T6 and T1 ≦ T2 <T17 <T18, the angle of the side surface is δ1 ≦ δ2 <δ1.
1 <δ12. That is, the V-shaped grooves 15a and 17a are formed so that the widths of the grooves gradually increase toward the end portions 11a and 11b and become deeper, and the angle δ1 of the side wall near the roll central portion 13 is constant. However, the angles δ11 and δ12 of the side wall near the roll end are formed so as to gradually increase.

In the above embodiment, both ends 11 of the roll are used.
The groove width was gradually increased by gradually increasing the angles δ11 and δ12 of the side walls closer to a and 11b. However, by making the angles of δ11 and δ12 the same as the angles of δ1, both sides of the perpendicular 23 were formed. The angles of the side walls may be the same. In this case, by gradually increasing the groove depth, the groove width can be formed so as to gradually increase at the same time.

FIG. 6 shows the length T of the side wall closer to the roll center 13.
5 shows another embodiment of a V-shaped groove in which the length of the side wall near both ends is gradually increased while 1 is kept constant, and the width and depth of the groove are gradually increased toward both ends of the roll. That is, the V-shaped grooves 15c and 17c are formed by gradually increasing the groove width and depth toward both ends 11a and 11b while keeping the length T1 of the side wall near the roll center 13 constant.
The angle of the side wall closer to δ1>δ13> δ14, and the length of the side wall closer to both ends 11a and 11b is T2 <T19 <
At T20, the angle of the side wall gradually increases, and δ2
<Δ15 <δ16. With the above configuration, the V-shaped groove 1
5c, 17c are V-shaped grooves 15a, 17a and square grooves 15b,
The same operation and effect as those of 17b can be obtained.

In the above, the same components are denoted by the same reference numerals. Also, V-shaped grooves 15a, 17a, square grooves 15b, 17
The conditions of the V-shaped grooves 15 and 17 are applied to the conditions such as the groove width, the groove depth, the lead angle, and the pitch change rate in the b-shaped and V-shaped grooves 15c and 17c. Further, in the above embodiment, the angles δ1 and δ5 of the side wall near the roll central portion 13 (the left half from the perpendicular 23 in FIG. 2) are formed at a predetermined angle, but as shown in FIG. The angle may be 0 degrees, that is, the same plane as the perpendicular line 23. Further, the roll surface has a straight shape and a crown shape, but the conditions such as the groove shape can be carried out regardless of the shape of the roll surface.

In each of the above embodiments, a single spiral groove distributed at the roll central portion 13 is used, but a plurality of spiral grooves can be formed according to the roll length, application, rotation speed, and the like. . When a new spiral groove is added, the leading end of the groove at the center of the roll body is preferably provided on the same circumference of the roll, and the interval is provided at a position equally dividing the circumference. 8 and 9 show an embodiment in which two spiral grooves are formed. That is, the spiral grooves 15A, 15B, and 17A, 17
B, and the leading edge is provided at a position where the same circumference X is bisected.

That is, the leading end of the spiral groove 15A is located at the center of the front in FIG.
Is located at the center of the back surface, and is provided at opposite positions where the same circumference is bisected, as is apparent from FIG.

FIG. 10 is a sectional view showing a case where three spiral grooves are provided, and FIG. 11 is a sectional view showing a case where four spiral grooves are provided. Each is provided at equal intervals on the same circumference. As shown in FIGS. 10 to 11, when a plurality of spiral grooves are used, the tension can be increased simultaneously in the circumferential direction and the axial direction, so that the wrinkle removing effect can be further improved. When a plurality of spiral grooves are provided, a plurality of grooves having the same shape may be provided, or grooves having different shapes may be combined.

According to the present invention, the spiral groove is distributed at the center of the roll body, and not only the lead angle is gradually increased toward both ends, but also the width of the groove is gradually increased toward both ends. Or gradually increase the depth of the groove,
Further, by gradually increasing the width and depth of the groove, the tension of the sheet-like material can be increased toward the roll end. Therefore, the flow of air becomes faster as it approaches the end, so that the temperature control becomes easier. Further, it is possible not only to extend wrinkles, but also to quickly discharge dust, paper dust, excess water and the like adhering to the roll.

Also, when coating a sheet-like material, the flow rate of the coating liquid can be freely changed, so that the coating liquid can be uniformly coated by flowing at an optimum speed, and the coating liquid can be reduced. .

[0031]

According to the worm roll according to the present invention, even when the worm roll has a long surface and is used at a high speed, it is prevented from being wrinkled as a calender roll for paper making and film, and is wound up neatly. be able to. Further, not only an excellent wrinkle spreading effect can be obtained, but also dust, paper powder, water and the like in the groove can be quickly discharged. Further, it is possible to cope with changes in the material and thickness of the sheet-like material, line speed, and the like.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a worm roll will be described below. The roll had an outer diameter of 152.76 mm, an overall length of 2,000 mm, and the roll had a crown shape with a secondary crown. The crown amount was 2 mm / diameter, and the surface was formed of chloroprene rubber (rubber hardness 60 degrees). For the groove pattern, spiral grooves distributed to both ends were processed symmetrically, leaving a central portion of 5 mm. As shown in FIG. 7, the shape of the rising groove at the center portion is such that the side wall of the groove near the roll center is a vertical surface, the side walls from both ends are inclined surfaces, the groove width L is 5 mm, and the groove depth h is The lead R was 2 mm, the lead R was 10 mm, and the increase rate of the lead was as shown in Table 1.

[0033]

[Table 1]

Using the roll having the above structure as a worm roll for papermaking, the degree of wrinkles remaining after conveyance was observed.
No wrinkles were seen and the effect of spreading wrinkles was extremely high.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view for explanation when the width of a spiral groove is gradually increased toward both ends of a roll.

FIG. 3 is an enlarged cross-sectional view illustrating another embodiment in which the shape of the spiral groove is changed.

FIG. 4 is an enlarged cross-sectional view for explaining another embodiment when the depth is changed while keeping the width of the spiral groove constant.

FIG. 5 is an enlarged cross-sectional view illustrating another embodiment in which the width and the depth of the spiral groove are changed.

FIG. 6 is an enlarged cross-sectional view illustrating another embodiment in which the width and the depth of the spiral groove are changed.

FIG. 7 is an enlarged cross-sectional view illustrating the shape of a groove in another embodiment.

FIG. 8 is a partial front view of a roll provided with two spiral grooves.

FIG. 9 is a sectional view of a roll provided with two spiral grooves.

FIG. 10 is a sectional view showing an embodiment in which three spiral grooves are provided.

FIG. 11 is a sectional view showing an embodiment in which four spiral grooves are provided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Roll main body 11 Coating layer 13 Roll center part 15, 17 Helical groove 19 Rotation axis of a roll main body 20 Line perpendicular to a rotation axis 21 Line in a spiral groove 23 Line perpendicular to a rotation axis

Claims (10)

[Claims] 1. A spiral groove which is distributed in the center of the roll and whose direction is reversed is formed, and the lead angle of the spiral groove and the width of the spiral groove gradually increase toward both ends of the roll. A worm roll characterized by being formed. 2. The width of the spiral groove is gradually increased by forming the angle of the side surface of the spiral groove closer to the roll end toward the both ends of the roll. The worm roll according to claim 1, wherein the worm roll is formed. 3. The worm roll according to claim 1, wherein a width of the spiral groove is 1 to 20 mm, and a change rate thereof is 1 to 3%. 4. A spiral groove which is distributed in the center of the roll and whose direction is reversed is formed, and the lead angle of the spiral groove and the depth of the spiral groove gradually increase toward both ends of the roll. A worm roll formed on a worm roll. 5. The worm roll according to claim 4, wherein the spiral groove has a depth of 0.5 to 5 mm, and a change rate thereof is 1 to 3%. 6. A spiral groove which is distributed in the center of the roll and whose direction is reversed is formed, and the lead angle of the spiral groove, the width and the depth of the spiral groove are gradually increased toward both ends of the roll. A worm roll characterized in that the worm roll is formed so as to be formed. 7. The width and depth of the spiral groove are increased by gradually increasing the angle of the side surface of the spiral groove closer to the roll end toward the both ends of the roll. 7. The worm roll according to claim 6, wherein the worm roll is formed so as to gradually increase in size. 8. The helical groove has a width of 1 to 20 mm, a depth of 0.5 to 5 mm, and a rate of change of 1 to 3%. The warm roll described in the above. 9. The roll according to claim 1, wherein the spiral groove is formed of a plurality of grooves, and the leading end portions at the center of the roll are formed at equal intervals on the same circumference.
8. The worm roll according to any one of items 8 to 8. 10. The start pitch of the spiral groove is 5 to 10.
20 mm, and the pitch change rate is 0.5 to 25%.
The worm roll according to any one of claims 1 to 9, wherein the worm roll is increased by 1% for each rotation.