JPH0838995A - Web feeding roll having rugged surface layer and its manufacture - Google Patents

Abstract

PURPOSE:To inexpensively and simply manufacture a roll for feeding a web having a rugged surface layer that consists of a material having a high friction coefficient hardly causing meandering or rolling of a web, inhibiting occurrence of wrinkles, scratches, etc., of the web an allowing the web to stably travel. CONSTITUTION:In this manufacture, a rugged surface layer 2 is formed on a delivery roll 1 by subjecting the roll 1 to spray coating with any one coating material capable of forming a rugged surface selected from solvent evaporation type elastomer coating materials obtained by blending at least one acrylic synthetic resin and one alkyl synthetic resin together, moisture curing type one package polyurethane resin elastomer coating materials, two package polyurethane resin elastomer coating materials and acrylic resin based emulsion coating materials.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web feed roll. More specifically, the present invention is
The present invention relates to a method for manufacturing a web feed roll and a web feed roll in a web processing machine such as a slitter.

[0002]

2. Description of the Related Art In a web processing machine such as a slitter, the web is processed at high speed while cutting the web. In these devices, it is necessary to bring the web into a predetermined tension state so that the web can be stably run without causing meandering, lateral vibration, wrinkles, scratches, and the like. This will be described with respect to a leather slitter which is one of web processing machines.

As shown in FIG. 3, a leather slitter (30)
Is composed of an unwinding part, a front guide part, a slit part, a rear guide part, and a winding part. The unwinding shaft (31), the guide rolls (32), (3
3), nip roll (34), feed roll (35), guide rolls (36), (37), leather cutter (3)
8), guide rolls (39), (40), (41), winding shafts (42), (43). A raw sheet (44) such as a wide paper or film is unwound from an original roll (45) wound around a winding shaft (31) at an unwinding portion, and a known tension control (not shown) is performed. ), A predetermined tension state is established, and the guide roll (32) of the front guide portion,
After passing through (33), the nip roll (34), one of which is a driving roll, and the feed roll (35) are nipped and transported, and introduced into the slitter section. In the slitter part, the original sheet (44) is a guide roll (36),
Between (37), the leather cutter (38) cuts and separates several sheets of a predetermined width. Then, one of the separated sheets is wound around the winding shaft (42) through the guide rolls (39) and (40) in the rear guide part, and the other sheet is wound through the guide roll (41) through the winding shaft. It is rolled up by (43). Sheet is 200-400m
The guide rolls are free rolls that are rotated by friction with the traveling sheet. The peripheral speed of the guide roll is rotated so as to be the same as the traveling speed of the sheet. For this purpose, the sheet is in close contact with the guide roll and the driving force from the sheet is surely transmitted to the guide roll. It is necessary. Air is entrained on the surface of the sheet that travels at high speed and the surface of the guide roll that is rotated, and the contact start portion between the sheet and the guide roll is in a negative pressure state.Therefore, air is trapped in the contact portion between the sheet and the guide roll. As a result, an air layer is formed between the sheet and the guide roll, and the sheet does not come into close contact with the guide roll and easily floats. If so, the driving force from the sheet is not reliably transmitted to the guide roll, uneven rotation of the guide roll occurs, the sheet meanders or shakes sideways, and the sheet has wrinkles and scratches, which makes it a valuable product. It may even cause the sheet to break or even break. Then, it also adversely affects the winding, causing a winding deviation, winding wrinkles, or winding collapse of the winding roll.

Therefore, in order to prevent air from being entrapped between the guide roll and the sheet or forming an air layer, various means such as those shown in the following [I] to [IV] have been conventionally used. Used alone or in combination. [I] Increase the tension on the seat. This makes it possible to prevent the air from being entrapped between the sheet and the guide rolls to some extent. However, if excessive tension is applied to the sheet made of a film or the like, there is a possibility that the sheet may undergo irreversible permanent elongation. Further, in the case of paper or the like, there is a limit to increase the tension because it is damaged by excessive tension.

[II] Increase the winding angle of the sheet around the guide roll. If a too large wrapping angle is adopted, there is a problem that the path length of the sheet becomes long and the number of guide rolls becomes large and the manufacturing cost becomes high.

[III] As shown in FIG. 4A, a suction hole penetrating from the surface is provided in the guide roll so as to suck air, or as shown in FIG. An air suction unit is provided to suck air, or, as shown in (c), a suction unit is provided near the contact start portion between the sheet and the guide roll to suck air. In the case of (a), there is a problem that the processing cost becomes high to provide a suction hole penetrating from the surface to the guide roll, and equipment for sucking air is required. Further, in (b) and (c), by disposing the suction part as shown in the figure, a space for the suction part is required, and the equipment cost for disposing the suction part, and further suction The running cost for doing this increases.

[IV] Grooves and recesses are formed on the surface of the guide roll, and a concavo-convex member is wound around the guide roll to form concavities and convexities on the surface of the guide roll. Alternatively, the air may be trapped in the recess and then allowed to escape through the groove or the unevenness, or the air may be kept trapped in the recess until the sheet and the guide roll are separated by the rotation, thereby forming an air layer. By suppressing it, the adhesion between the sheet and the guide roll surface is improved. What is shown in FIG. 5 (a) is one in which fine pitch grooves are precisely engraved obliquely on the surface of the guide roll,
What is shown in (b) is one in which grooves are cut in a cross-cut shape on the surface, what is shown in (c) is what is engraved with diamond-shaped recesses on the surface, and what is shown in (d) is , With a satin finish on the surface by sandblasting,
In (e), a rubber sheet having irregularities is spirally wound on a base material roll of aluminum, iron or the like. The guide roll having grooves, recesses and the like as shown in (a) to (c) is made of aluminum,
When it is made of a metal such as iron, it is manufactured by directly engraving the base material roll using an appropriate processing machine or by engraving and then plating. Precisely engraving grooves, recesses, etc. on a metal base roll requires skill and increases cost.
There is a problem that the delivery time of the product becomes long and the surface of the sheet such as a film is easily scratched because the edges such as grooves and recesses are sharp. Aluminum is preferable because it is lightweight, but it is easily scratched by the edges of a sheet running at high speed, and has poor durability.
Further, since metal has a small friction coefficient, it is necessary to increase the tension applied to the sheet, and as a result, there is a problem that the film or the like is stretched. For this reason, a guide roll is used in which an elastic coating layer made of rubber or the like having a large friction coefficient is applied to a metallic base material roll, and the coating layer is provided with grooves, recesses and the like similar to the above. However, there are still problems that engraving work requires skill, the cost is high, and the delivery time of the product is long. In the case where the surface is satinized by sand blasting or the like as shown in (d), the height difference of the unevenness of the guide roll surface is small, and the effect of letting air escape is not sufficient. The product as shown in (e) requires skill to uniformly wind a rubber sheet having irregularities on a base material roll in a spiral shape, and since the rubber sheet is expensive, the manufacturing cost becomes high, As the delivery time becomes longer and the rubber sheet is less durable, it must be replaced frequently. The same thing as described above usually occurs not only in the guide roll but also in a web feed roll such as a drive roll that comes into contact with one side of the web.

[0008]

SUMMARY OF THE INVENTION The present invention was devised as a result of intensive research in view of the above-mentioned circumstances, and the web causes meandering or lateral vibration, and wrinkles, scratches, etc. occur on the web. Inexpensive and simple manufacturing method of a web feed roll having an uneven surface layer made of a material having a high friction coefficient, which can be stably run without causing the uneven surface layer to be uniformly formed on the base material roll surface. ,
It is also an object of the present invention to provide a method for manufacturing a web feed roll that can be easily formed, and to provide a web feed roll.

[0009]

In order to solve the above-mentioned problems, the method of manufacturing a web feed roll having an uneven surface layer according to the present invention comprises spray-coating a base material roll with a paint capable of forming unevenness. Is used to form an uneven surface layer on the substrate roll. Further, the coating material capable of forming unevenness is at least a solvent evaporation type elastomer coating material of a mixture of acrylic synthetic resin and alkyd synthetic resin, a moisture curing type one-component polyurethane resin elastomer coating material, 2
It is preferably either a liquid polyurethane resin elastomer paint or an acrylic resin emulsion paint. Further, as the web feed roll (1),
It is characterized in that a coating material capable of forming unevenness is spray-coated on a base material roll to form an uneven surface layer (2) (see FIG. 1). And, the uneven surface layer formed by spray coating is at least a solvent-evaporating elastomer paint of acrylic synthetic resin and alkyd synthetic resin mixture, a moisture-curable one-component polyurethane resin elastomer coating, and a two-component polyurethane resin elastomer It is preferable that it is formed from a paint having an irregularity-forming ability, which is made of any one of paint and acrylic resin emulsion paint.

The invention of this application will be described in detail below.
First, the base material roll used in the present invention is preferably lightweight and has sufficient strength, for example, a light metal such as aluminum can be used, but a base material roll using a carbon fiber reinforced composite material, A base roll coated with a cork powder-dispersed composite material or the like can also be used.
Of course, even iron or the like can be used as long as it has a lightweight structure. When the web feed roll is a guide roll, it is used as a free roll with a shaft as shown in FIG. 6 (a) and as a free roll without a shaft as shown in (b). Prior to coating, the base roll is preferably subjected to pretreatment, if necessary. The pretreatment is different depending on the material of the base material roll, the paint used, etc., but for example, the substrate is exposed by lathe processing, pickling, cleaning treatment such as degreasing, electrolytic polishing, etching treatment such as chemical polishing, sandblasting, Necessary treatments such as sandpaper proofing, primer treatment, etc. are appropriately performed.

As the paint, it is desirable that the coating film has a high coefficient of friction among the paints capable of forming irregularities, and various kinds of chipping paints are suitable. As the chipping paint, for example, a paint for solvent evaporation type elastomers of a mixture of acrylic synthetic resin and alkyd synthetic resin; trade name "Rubber Chipping L Black" (manufactured by Nippon Koza Co., Ltd., Sancreo Co., Ltd.), moisture curable 1 liquid Polyurethane resin elastomer paint; trade name "Inner Coat 2" (Nippon Koza Co., Ltd., Sancreo Co., Ltd.), two-component polyurethane resin elastomer paint; trade name "U-300"
0 "(manufactured by Yokohama Rubber Co., Ltd.), acrylic resin emulsion paint; trade name" SS Underguard "(manufactured by Sansai Kako Co., Ltd.) and the like. These coating materials are spray-coated so as to form irregularities on the surface of the base material roll to form an irregular surface layer having a desired thickness and a desired height. The uneven surface layer may be formed by coating one kind of coating layer, and then coating layers of the same kind or other kinds may be laminated thereon, and further, if necessary, an appropriate topcoating, for example, a coating having excellent abrasion resistance. It is needless to say that the overcoating may be applied to such an extent that the unevenness is not affected. Needless to say, the coating material capable of forming irregularities is not limited to the above.

As a device for coating these paints, for example, in the case of one liquid, an air spray type coating device (10) as shown in FIG. 2 can be used.
The apparatus includes a spray application mechanism, a spray application mechanism transfer means, a paint supply means, an air supply means including an air compressor,
It has a base roll fixing / rotating means. The spray application means is
It is equipped with a nozzle (11) and a head (12) holding the nozzle, and the spray coating mechanism transfer means feeds the rotation of a motor (13) composed of a stepping motor or the like to the feed screw (1).
4) to be transmitted to the head (12), and the head (12) can be moved in the left-right direction at a predetermined speed along the head guide shaft (15). The distance between the tip of the nozzle (11) and the base material roll (3) can be made variable by appropriate adjusting means (not shown). In addition, the paint supply means can supply the paint from the paint tank (16) to the nozzle (11) of the head (12) via the metering pump (17) and the air compressor (18). It is adapted to be sprayed from the nozzle (11) by the air sent through the supply pipe. Then, the base material roll (3) is rotated by a motor (19) such as a servomotor via the base material roll fixing / rotating means. With such a spray coating device, a coating material is spray-coated on the surface of the base material roll to form an uneven surface layer. Therefore, the amount of air supplied from the air compressor (18) and the metering pump (1
7) the amount of coating material supplied, the moving speed of the head (12),
The rotation of the base material roll (3) is appropriately controlled by a control means (not shown) according to the type of coating material, the desired uneven shape, and the like. In this case, (i) continuous coating may be performed in which the head (12) is moved in the left-right direction while the base material roll (3) is rotated at a predetermined speed, and spray coating is performed, or
(Ii) The head (12) is moved forward in the entire width direction of the base material roll (3) for spray coating, and then the base material roll (3).
May be rotated by a predetermined angle, and the head (12) may be moved back to carry out spray coating intermittently. In the case of a two-pack type paint, a structure in which a set of a paint tank and a metering pump is further added to the air spray type coating apparatus of FIG. 2 may be used (not shown). Note that FIG. 2 shows the case where the shaft-applied base material roll is spray-coated, but when the shaft-less base material roll is spray-applied, both ends of the shaft-free base material roll are sandwiched by conical chucks. The rotation may be performed according to 19).

It is necessary that the layer thickness, the height of the unevenness, and the interval between the uneven surface layers satisfy the various conditions. That is, the uneven surface layer has sufficient abrasion resistance, the coating surface strength is sufficient, the roll accuracy,
It has good cylindricity and roundness, and it is in a range where weight-balanced coating can be performed, air drawn into the irregularities easily escapes, and power transmission efficiency due to friction between the web and the feed roll. However, it is necessary to satisfy the various conditions such as not leaving the deformation distortion due to the unevenness on the web. Also, the physical properties of the paint used,
It is determined in consideration of the type, thickness, traveling speed, etc. of the web that is the object to be conveyed, and cannot be specified unconditionally, but the layer thickness of the uneven surface layer is usually 0.
2 to 5.0 mm, the height of the unevenness is preferably 0.1 to 3.0 mm, and the interval between the unevenness is preferably 0.2 to 6.0 mm. If the thickness of the uneven surface layer is less than 0.2 mm, the background of the base material roll will be exposed and it will be difficult to form sufficient unevenness, and it will be easily peeled off from the base material roll and easily damaged by the web. If it exceeds 5.0 mm, it is difficult to apply the roll while keeping the roundness thereof, which is not preferable. Concavo-convex height is 0.1 mm, concavo-convex interval is 0.2
If it is less than mm, the air trapped between the unevenness of the roll and the web is difficult to escape, and the web is easily lifted from the roll direction, which is not preferable, and the unevenness height is 3.0 mm and the unevenness interval is 6.0 mm. If it exceeds, the deformation strain due to the unevenness may remain on the web, which is not preferable. The thickness of the uneven surface layer, the uneven height, and the uneven spacing depend on the spray coating conditions such as the paint used, its concentration, air pressure, distance from the nozzle, nozzle diameter, nozzle moving speed, and rotation speed of the base material roll. It is different. In the uneven surface layer, the uneven height and the uneven spacing have the following relationships with the air pressure, the distance from the nozzle, the nozzle diameter, the coating speed, and the density. That is, (a) when the pressure of the air increases, the height of the unevenness becomes low and the interval between the unevenness becomes short. (B)
The longer the distance from the nozzle, the higher the uneven height,
The uneven spacing becomes shorter. (C) The larger the nozzle diameter, the longer the uneven spacing. (D) As the coating speed becomes slower, the unevenness interval becomes longer. (E) As the density increases, the height of the unevenness increases. Therefore, taking these into consideration, desired unevenness is formed on the surface of the base material roll.

According to the air spray type coating apparatus shown in FIG. 2, the air pressure is 2 to 5 kg / cm ² , the distance from the nozzle is 200 to 300 mm, and the nozzle moving speed is 250 to 3
When the substrate roll is continuously rotated at 00 mm / sec, it is preferable to apply the coating at a rotation speed of 25 to 30 rpm. After application, the solvent volatilization drying and solidifying type paint can be dried naturally or
After drying by heating, in the case of a moisture-curing type, two-component curing type, etc. reactive coating, after leaving it to stand naturally, it is cured to obtain a product.

[0015]

[Function] According to the processing conditions such as coating material, coating amount, spraying pressure, spraying distance and the like when spraying a coating material having the ability to form irregularities on the base material roll, a desired height and interval can be set on the base material roll. An uneven surface layer can be formed, and a web feed roll having a surface structure suitable for various webs can be easily and inexpensively manufactured without requiring skill.

[0016]

The present invention will be described in more detail with reference to the following examples. Of course, the present invention is not limited to the following examples. (Example 1) A base roll made of aluminum having an outer diameter of 76 mm and a length of 1300 mm with a shaft was subjected to a surface roughness undercoat treatment with 300 count sandpaper, followed by a mitchup primer treatment, and then FIG. Spray coating was applied to the base material roll by using the spray coating apparatus shown in FIG. As the coating material, a solvent evaporation type coating material for a solvent-evaporated elastomer in which an acrylic synthetic resin and an alkyd synthetic resin were mixed; trade name "Rubber Chipping L Black" (manufactured by Nippon Koza Co., Ltd., Sancreo Co., Ltd.) was used. Nozzle diameter 5m
m, air pressure 4 kg / cm ² , coating distance with the base material roll 2
00 mm, roll rotation speed 30 rpm, nozzle movement speed 300 mm / sec, and wait for spontaneous evaporation of the solvent.
Average thickness of irregular surface layer 1.2 mm, average height of irregularity 0.8
mm, and an unevenness interval of 1.4 mm was obtained. Here, the unevenness height and unevenness interval of the uneven surface layer are measured after drying by a stylus type roughness meter (trade name: Contracer CP-200: manufactured by Mitutoyo Corporation).
Was measured by The obtained roll was slittered in the form shown in FIG. 3 (trade name; SNR-130 type slitter:
Installed as a guide roll for Toshin Co., Ltd., 0.0
Stretched polypropylene film with a thickness of 2 mm (hereinafter OPP
When the film is slit at a running speed of 300 m / min, the film is closely adhered to the guide rolls without being lifted and is guided in a good condition. No scratches are formed on the film surface, no elongation occurs, and good winding. I was able to get the appearance roll. In addition, even after long-term operation, the guide roll surface was slightly worn.

(Example 2) The same base roll as in Example 1 was used, and the same base treatment, the same primer treatment and the same spray coating apparatus as in Example 1 were used except that the coating material was different. As the paint, a moisture-curable one-component polyurethane resin elastomer paint; trade name "Inner Coat 2" (manufactured by Nippon Koza Co., Ltd., Sancreo Co., Ltd.) was used. For spray coating, the nozzle diameter is 8 mm, the air pressure is 4 kg / cm ² , the coating distance to the base material roll is 300 mm, and the roll rotation speed is 30.
rpm, nozzle movement speed 300 mm / sec,
After curing with moisture, the average thickness of the uneven surface layer is 1.6 m
m, the average height of the unevenness was 1.1 mm, and the unevenness interval was 1.8 mm. Here, the uneven height and uneven spacing of the uneven surface layer were measured by the same method as described in Example 1. The obtained roll was mounted as a guide roll of the same slitter as in Example 1, and an OPP film having a thickness of 0.02 mm was used as a guide roll.
When slit at a running speed of 0 m / min, the film is guided in a good condition without sticking up from the guide rolls, and the film surface is not scratched or stretched. I was able to get the roll. In addition, even after long-term operation, the guide roll surface was slightly worn.

(Example 3) The same base roll as in Example 1 was used, and the same base treatment, the same primer treatment and the same spray coating apparatus as in Example 1 were used except that the coating material was different. As the paint, acrylic resin emulsion paint;
Product name "SS Underguard" (manufactured by Sansai Kako Co., Ltd.)
Was used. Spray application, nozzle diameter 8mm, air pressure 4k
g / cm ² , coating distance to substrate roll 300 mm, roll rotation speed 30 rpm, nozzle moving speed 300 mm / sec, and after drying, average thickness of uneven surface layer is 1.4 m
m, the average height of the unevenness was 0.9 mm, and the unevenness interval was 1.4 mm. Here, the uneven height and uneven spacing of the uneven surface layer were measured by the same method as described in Example 1. The obtained roll was mounted as a guide roll of the same slitter as in Example 1, and an OPP film having a thickness of 0.02 mm was used as a guide roll.
When slit at a running speed of 0 m / min, the film is guided in a good condition without sticking up from the guide rolls, and the film surface is not scratched or stretched. I was able to get the roll. In addition, even after long-term operation, the guide roll surface was slightly worn.

(Example 4) Using the same substrate roll as in Example 1, the same base treatment and the same primer treatment were performed. Next, the base material roll was spray-coated using a spray coating device capable of simultaneously spraying the two liquids from a nozzle. As the paint, a two-component polyurethane resin elastomer paint; trade name "U-3000" (manufactured by Yokohama Rubber Industry Co., Ltd.) was used. For spray coating, nozzle diameter is 8 mm, air pressure is 4 kg / cm ² , coating distance with base material roll is 300 m.
m, roll rotation speed 30 rpm, nozzle movement speed 300
mm / sec, and after curing by a two-component reaction, the uneven surface layer has an average layer thickness of 1.5 mm and an uneven height of 1.1 mm.
An unevenness interval of 1.6 mm was obtained. Here, the uneven height and uneven spacing of the uneven surface layer were measured by the same method as described in Example 1. The obtained roll was mounted as a guide roll of the same slitter as in Example 1, and an OPP film having a thickness of 0.02 mm was slit at a running speed of 250 m / min, and the film was adhered without rising from the guide roll. It was possible to obtain a take-up roll that was guided in a good condition, had no scratches on the film surface, and did not grow, and had a good winding appearance. In addition, even after long-term operation, the guide roll surface was slightly worn.

[0020]

Since the present invention is configured as described in detail above, it has the following effects. According to the processing conditions such as coating material, coating amount, spraying pressure, spraying distance, etc. when spray-coating the coating material having the irregularity forming ability on the base material roll, a desired height on the base material roll, an uneven surface layer having a gap is formed. Since it is possible to form the web feed roll having a surface structure suitable for various webs without requiring skill, it is possible to reduce the cost and shorten the delivery time of the product. When the uneven surface layer of the web feeding roll is worn, it can be easily regenerated by removing the uneven surface layer and spraying.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a guide roll obtained by the present invention, (a) is an overall view, and (b) is a partially enlarged view.

FIG. 2 is a perspective view showing an example of a coating apparatus used in the present invention.

FIG. 3 is a schematic view showing a leather slitter.

FIG. 4 is a schematic view showing a conventional web guide roll device provided with a suction means.

FIG. 5 is a front view showing a conventional guide roll having grooves, irregularities, etc. on its surface.

FIG. 6 is a front view showing a guide roll.

[Explanation of symbols]

 1 Feed roll 2 Uneven surface layer

Claims (4)

[Claims] 1. A method for producing a web feed roll, comprising forming a textured surface layer on the base material roll by spray-coating a coating material capable of forming a textured surface on the base material roll. 2. A coating material capable of forming unevenness, at least
It is one of solvent-evaporative elastomer paints, a mixture of acrylic synthetic resin and alkyd synthetic resin, moisture-curable one-component polyurethane resin elastomer coating, two-component polyurethane resin elastomer coating, and acrylic resin emulsion coating. The method for manufacturing a web feed roll according to claim 1, wherein 3. A web feed roll, characterized in that a coating material capable of forming irregularities is spray-coated on a substrate roll to form an irregular surface layer. 4. An uneven surface layer formed by spray coating has at least a solvent-evaporative elastomer coating mixture of an acrylic synthetic resin and an alkyd synthetic resin, a moisture-curable one-component polyurethane resin elastomer coating, and a two-component polyurethane. 4. The web feed roll according to claim 3, wherein the web feed roll is formed of a coating material having a concavo-convex forming ability, the coating material comprising resin elastomer coating material or acrylic resin emulsion coating material.