JP2017159311A - Roll molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll molding method capable of molding by simple material connection.SOLUTION: In a roll molding method, a strip-shaped foregoing material is roll molded by a roll former, and a strip-shaped subsequent material, whose tip part is connected to a trailer of the foregoing material with an adhesive tape, is introduced into the roll former in succession to the foregoing material.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a roll forming method, in which a metal band material as a raw material wound in a coil shape (hereinafter simply referred to as a “coil”) is continuously formed, and the material is continuously supplied at the time of replacement. The present invention relates to a technique for connecting two front and rear coils.

  Conventionally, a roll forming line for forming a shape steel, a deck plate, a beam of a guard fence, a steel pipe, and the like is arranged in the order of an uncoiler, a leveler, a roll forming machine, and a cutting machine. A material such as a coiled thin metal strip (such as a steel strip) is unwound and put into the leveler as a continuous plate-like material by an uncoiler. The leveler corrects the arc-shaped habit of the coiled material horizontally, and then the material is fed into a roll forming machine for molding the material into a predetermined shape. The shaped product formed by the roll forming machine is cut into a predetermined length by a cutting machine to obtain a final product shape.

  For example, in Patent Document 1, a metal strip is introduced into a cold roll forming line having the above-described configuration, and a thin plate-like material is continuously formed into the same cross-sectional shape. In the uncoiler, the coil of the metal strip is unwound and the material is fed into the roll forming machine. When the steel plate is unwound to the end of the coil, it is necessary to continuously feed the next material into the roll forming machine. At this time, when feeding the next material into the roll forming machine, it is necessary to connect the tip of the next coil to the end of the previous coil by welding so that the material fed into the roll forming machine is not interrupted. It was.

JP 56-114532 A

  However, in the roll forming method including Patent Document 1, when the terminal end of the previous coil and the tip end of the next coil are connected by welding, it takes time for welding work. Further, since the welded portion has a raised shape due to the welding bead, measures such as cutting the raised portion with a sander or the like are required to introduce the welded portion into the roll forming machine. Furthermore, there is a possibility that the material may be altered due to the heat effect of welding, or that the material may become dirty due to sputtering during welding. In addition to the above-described problems, the worker who performs the welding work needs qualifications and skills for the welding work, and thus there is a problem that the number of workers is limited.

  The present invention meets the above-described needs, and an object of the present invention is to provide a roll forming method in which a coil of a material is connected by a method other than welding in a roll forming machine.

  In the roll forming method according to the present invention, the band plate-shaped preceding material is roll-formed by a roll molding machine, and the band plate-shaped subsequent material has a tip end connected to an end portion of the preceding material by an adhesive tape, Following the preceding material, it is introduced into the roll forming machine.

  In the roll forming method according to the present invention, the connection between the preceding material and the succeeding material is performed using an adhesive tape, so that the work of scraping off the welded portion after welding becomes unnecessary, and the heat effect and material contamination due to welding may occur. Absent. Further, when connecting the preceding material and the succeeding material, the operator can easily carry out without requiring any special qualification. As a result, the work time required for the material connection work can be shortened, and further, the deterioration of the surrounding work environment can be prevented.

(A) is the figure which looked at the cold roll forming line 100 which concerns on Embodiment 1 of this invention from upper direction, (b) looked at the cold roll forming line 100 of (a) from the horizontal side surface direction. It is a figure. It is sectional drawing which showed the example of the cross-sectional shape of the width direction of the molded article shape | molded with the cold roll forming line of FIG. (A) is explanatory drawing which shows the connection part of the material at the time of coil replacement | exchange in Embodiment 1 of this invention, (b) is explanatory drawing which looked at (a) from the horizontal direction. It is a schematic diagram of the state in which the connection part of material entered into the roll forming machine which concerns on Embodiment 1 of this invention. (A) is explanatory drawing which shows the connection part of the material at the time of coil replacement | exchange in Embodiment 2 of this invention. (B) is sectional drawing which shows the AA cross section of (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Each figure is shown schematically, and the relative size and thickness of each member are not limited to the illustrated dimensions. Moreover, in the following drawings, the relationship of the size of each component may be different from the actual one. In addition, in the figure, when the reference numerals attached to the respective parts are not attached with subscripts (a, b, etc.), the reference numerals attached with subscripts are collectively referred to.

[Embodiment 1]
Fig.1 (a) is the figure which looked at the cold roll forming line 100 which concerns on Embodiment 1 of this invention from upper direction. FIG.1 (b) is the figure which looked at the cold roll forming line 100 of Fig.1 (a) from the horizontal side surface direction. FIG. 1 shows the configuration of a cold roll forming line 100 used in the roll forming method according to Embodiment 1 of the present invention. The cold roll forming line 100 shown in FIG. 1 is an example of a cold roll forming line 100 that implements the roll forming method of the present invention, and each device constituting the cold roll forming line 100 is: The present invention is not limited to that shown in FIG. The arrangement and specifications of each device can be appropriately changed according to the product manufactured by the cold roll forming line 100, the environment in which the cold roll forming line 100 is installed, and the like.

(Cold roll forming line 100)
Roll forming is one of the methods for producing a long product with a uniform cross-sectional shape by bending an elongated strip-like plate in the width direction. In the cold roll forming line 100 according to Embodiment 1, several sets of upper and lower forming rolls are arranged side by side. In the cold roll forming line 100, a strip-shaped material is sequentially bent from the tip through each roll set (also referred to as a “roll stand” including the support base) and finished to a final cross-sectional shape. Go. As the material, a material obtained by winding a strip-shaped metal into a coil shape can efficiently produce a product having a long dimension.

  The cold roll forming line 100 in the first embodiment includes an uncoiler 10, a leveler 11, a roll forming machine 12, a cutting machine 13, and a take-out table 14. On the uncoiler 10 is a coil wound with a strip-shaped metal material. The coil 20 already supplies the strip-shaped metal material to the cold roll forming line 100, and the coil 20 is followed. Next, the coil 30 supplies material to the cold roll forming line 100. The uncoiler 10 supports the coil 20 and unwinds a strip-shaped metal material. The strip-shaped metal material unwound by the uncoiler 10 is sent to the leveler 11. The leveler 11 takes strain such as winding when the material is in a coil state.

  The material from which the strain is removed by the leveler 11 is introduced into the roll forming machine 12. The roll forming machine 12 is configured by arranging a plurality of roll sets 12a to 12i in series. Each of the roll sets 12a to 12i includes a plurality of rolls. The roll is rotated so as to send the material from the leveler 11 side toward the downstream side, and the material that has passed through each of the roll sets 12a to 12i is sequentially sent to the downstream side.

  Each of the roll sets 12a to 12i has a roll shape designed so that the band plate-like metal material has a predetermined shape. The strip-shaped metal material that has entered the roll forming machine 12 has a flat plate shape at first, but when it enters the first roll set 12a, it is plastically deformed into a shape that conforms to the roll shape and is sent to the next roll set 12b. It is done. The material is gradually plastically deformed as it passes through each of the roll sets 12b to 12i, and has a desired cross-sectional shape after leaving the last roll set 12i. In FIG. 1, nine roll sets 12a to 12i are arranged on the roll forming machine 12, but the number of roll sets is not limited to this. The number of roll sets can be determined as appropriate depending on factors such as the degree of complexity of the shape of the product formed by the cold roll forming line 100, the number of bent portions, and the height dimension of the cross-sectional shape.

  The material deformed into a desired cross-sectional shape by the roll forming machine 12 passes through the cutting machine 13. The cutting machine 13 cuts the material when the material reaches a predetermined length, is cut from the material that was a continuous strip from the uncoiler 10 to the cutting machine 13, and has a predetermined length and a desired cross-sectional shape. It becomes a molded product. The product is placed on the take-out table 14 and taken out from the cold roll forming line 100 in order, and is carried to a stock yard or the like.

(Molding in the cold roll forming line 100)
FIG. 2 is a cross-sectional view showing an example of the cross-sectional shape of a molded product 50 formed by the cold roll forming line 100 of FIG. In the first embodiment, the molded product 50 is formed by, for example, molding a steel sheet having a surface plated with zinc. The strip-shaped metal material passed through the cold roll forming line 100 has a flat cross-sectional shape before entering the roll forming machine 12. By being gradually plastically deformed by each of the roll sets 12a to 12b of the roll forming machine 12, a deformed portion 51 is formed on the flat plate.

  In each roll set 12a to 12i of the roll forming machine 12, two rolls are arranged with their rotation axes in parallel, and the material passes between them. At that time, of the shape of the molded product 50, the deformed portion 51, which is a portion deformed from the initial flat plate shape, is sandwiched between two molding rolls, and the shape of the gap created by the outer periphery between the two molding rolls Plastically deformed into a shape along On the other hand, the non-deformation part 52 which is a part which is not deform | transforming from the shape (flat plate shape) of the initial material among the shapes of the molded article 50 passes between two forming rolls in each roll set 12a-12i. It is not positively pressed by the forming roll. The gap between the two forming rolls through which the non-deformed portion 52 passes is larger than the plate thickness of the non-deformed portion 52. In the cold roll forming line 100 according to the first embodiment, a gap of 0.1 mm to 0.2 mm is set between the plate thickness of the non-deformable portion 52 and the forming roll. Thereby, when the deformation | transformation part 51 is pressed and deform | transformed by two rolls, since the non-deformation part 52 is not pressed by the forming roll, it moves to the width direction (white arrow direction of FIG. 2) of a material. Can do. By moving the non-deformable portion 52 in this manner, only the portion of the deformable portion 51 that is desired to be deformed can be deformed, and unnecessary extension and distortion do not occur in other portions.

  The shape of the molded product 50 shown in FIG. 2 is an example for explaining the cold roll forming method of Embodiment 1, and is not limited to this shape. Moreover, the material of the molded product 50 is not limited to the steel plate on which galvanization is performed. For example, a stainless steel plate or a copper plate is also used.

(Coil replacement work)
In the cold roll forming line 100 shown in FIG. 1, when a strip-shaped metal material is continuously fed from the coil 20 to the roll forming machine 12, the material wound around the coil 20 is exhausted. When the molding is continued even if the coil 20 is exhausted, it is necessary to feed the material from the coil 30 placed on the uncoiler 10 to the roll forming machine 12. At that time, it is necessary to connect the end of the material fed from the coil 20 to the roll forming machine 12 and the front end of the material wound around the coil 30.

  FIG. 3 (a) is an explanatory view showing a material connecting portion at the time of coil replacement in the first embodiment of the present invention. FIG. 3B is an explanatory view of FIG. 3A viewed from the horizontal direction. Here, the strip-shaped metal material supplied from the coil 20 to the roll forming machine 12 is referred to as a preceding material 21. Further, a strip-shaped metal material supplied from the coil 30 after the preceding material 21 supplied from the coil 20 is exhausted is referred to as a subsequent material 31. When the succeeding material 31 is supplied from the coil 30 after the preceding material 21 supplied from the coil 20 is exhausted, the tip of the succeeding material 31 is attached to the end of the preceding material 21 as shown in FIG. Connect with. When the end of the preceding material 21 and the tip of the succeeding material 31 are connected, the succeeding material 31 is pulled downstream of the cold roll forming line 100 following the preceding material 21 and introduced into the leveler 11 and the roll forming machine 12. To go.

  The end of the preceding material 21 and the tip of the succeeding material 31 are in a state in which the end surfaces are abutted with each other, and the adhesive tape 80 is attached from above. The end of the preceding material 21 and the succeeding material 31 may be abutted after being cut so that the end faces are parallel to each other. By doing in this way, since the preceding material 21 and the succeeding material 31 are abutted with each other with high accuracy, the adhesive tape 80 is secured in a range where the adhesive tape 80 is bonded from the preceding material 21 to the succeeding material 31 and is therefore difficult to peel off. Become.

  As shown in FIG. 3A, the width direction dimensions of the preceding material 21 and the succeeding material 31 may be different. By using a material having a different width direction for the subsequent material 31, it is possible to continuously produce molded products having different width-direction dimensions on the same cold roll forming line 100. When a material having a width direction dimension different from that of the preceding material 21 is used as the subsequent material 31, the one side end 21 a of the preceding material 21 is aligned and connected so as to be on the extension line of the one side end 31 a of the subsequent material 31. .

  FIG. 4 is a schematic view of a state in which a material connecting portion is included in the roll forming machine 12 according to the first embodiment of the present invention. FIG. 4 shows a state where the connecting portion between the preceding material 21 and the succeeding material 31 is positioned between the roll set 12a and the roll set 12b of the roll forming machine 12. FIG. 4 shows an example when the connecting portion of the material enters the roll forming machine 12, and when the connecting portion of the material is positioned between the roll sets of the other roll sets 12b to 12i, The contents described below are applicable.

  In FIG. 4, an upper roll 60a and a lower roll 61a located on the right side show the rolls constituting the roll set 12a. Moreover, the upper roll 60b and the lower roll 61b located in the left side of FIG. 4 show the roll which comprises the roll set 12b. The four rolls shown in FIG. 4 rotate around their respective central axes, the upper rolls 60a and 60b rotate clockwise, and the lower rolls 61a and 61b rotate counterclockwise. Therefore, the preceding material 21 and the succeeding material 31 sandwiched between the upper rolls 60a and 60b and the lower rolls 61a and 61b are sent from the upstream side on the right side in FIG. 4 to the downstream side on the left side.

  The roll set 12a rotates so that the peripheral speeds of the upper roll 60a and the lower roll 61a are substantially equal at the portion in contact with the material, and plastically deforms the material from the upstream side to the downstream side of the cold roll forming line 100. Send out while letting. The same applies to the roll set 12b. However, the speed at which the material of the roll set 12a is sent out is not exactly the same as the speed at which the material of the roll set 12b is sent out. Usually, the speed at which the material is fed out is faster in the roll set 12b than in the roll set 12a, and a force is applied to the material between the roll set 12a and the roll set 12b in the pulling direction. That is, a force is applied in the direction indicated by the arrow 90 in FIG.

  Therefore, when the connecting portion of the material is positioned between the roll set 12a and the roll set 12b, the adhesive tape 80 that connects the preceding material 21 and the succeeding material 31 is pulled in the direction indicated by the arrow 90 in FIG. It takes power.

(Material of adhesive tape 80)
When the connecting portion is positioned between the roll sets 12a to 12i, the adhesive tape 80 is applied with a tensile force as described above, and therefore requires strength in the tensile direction. Therefore, in order to ensure strength, the adhesive tape 80 has a configuration in which, for example, glass fibers and resin fibers are arranged on a resin base material. The direction in which the fibers of the adhesive tape 80 are arranged is the direction in which the adhesive tape 80 is pulled. Moreover, it is more preferable that the direction in which the fibers of the adhesive tape 80 are arranged is arranged not only in the direction in which the adhesive tape 80 is pulled but also in the direction perpendicular thereto. The force applied to the connecting portion of the material is not limited to the direction in which the material is simply pulled, but the material may be displaced in the width direction due to the deformation of the material in each of the roll sets 12a to 12i. This is because a pulling force may also be applied in the direction.

  In addition, the adhesive tape 80 has a strength that allows the base material to withstand the tensile force as well as the adhesive force to withstand the tensile force. In addition, not only the tensile force but also the end of the preceding material 21 and the leading end of the succeeding material 31 may be displaced up and down at the connecting portion of the material. For example, when each of the roll sets 12a to 12i is deformed, the periphery of the deformed portion is also displaced by the deformation of the material. Therefore, since the adhesive tape 80 is subjected to a force to be peeled up and down, the adhesive tape 80 also has an adhesive force that can counter this.

  The material of the adhesive tape 80 is resistant to water and oil. Water or oil may adhere to the cold roll forming line 100 or the material. Therefore, if the material of the adhesive tape 80 is a material that absorbs water or oil and changes its quality, the adhesive tape 80 is cut in the cold roll forming line 100, and the subsequent material 31 does not follow the preceding material 21 in the middle of the line. This is because there is a possibility that a bad effect such as being caught on the surface may occur. Therefore, the base material of the adhesive tape 80 is preferably made of a material such as polyester or polypropylene. Further, the fibers arranged on the above-described base material have resistance to water and oil.

(Attaching position of adhesive tape 80)
In the connection part of the material, the position where the adhesive tape 80 is applied needs to be a part that does not receive a processing force from the forming roll in the roll forming machine 12. For example, in the molded product 50 after being molded by the cold roll forming line 100, it is necessary to affix it to a portion that is not deformed, that is, a portion of the non-deformed portion 52. As shown in FIG. 3, the adhesive tape 80 is pasted across the terminal portion of the preceding material 21 and the tip portion of the succeeding material 31. The pasting position of the material of the adhesive tape 80 in the width direction is within the range of the non-deformable portion 52.

  The deformed portion 51 of the material is sandwiched between the upper roll 60 and the lower roll 61 in each of the roll sets 12a to 12i, receives a load in a direction perpendicular to the surface of the material, and the upper roll 60 and the lower roll 61 Also receives frictional force due to rotation. When the adhesive tape 80 is affixed on the deformation | transformation part 51 by these forces, the adhesive tape 80 cuts and peels, and it may adhere to one of each roll sets 12a-12i, and may get entangled. When the adhesive tape 80 is entangled with the roll, the material cannot be formed into a predetermined shape, and this needs to be avoided.

(Effect of Embodiment 1)
In addition, based on Embodiment 1, the preceding material 21 and the succeeding material 31 are connected and processed in the cold roll forming line 100, and the succeeding material 31 is succeeded by the cold roll forming line 100 following the preceding material 21 without any problem. Could be introduced. Molding in the cold roll forming line 100 was performed under the following conditions. The formed material is a steel plate for a deck plate that is galvanized. The thickness is 1.2 mm (“t” shown in FIG. 2), the height dimension h after molding is 13.5 mm, the plate width is 289 mm for the preceding material 21, and 239 mm for the succeeding material 31. The adhesive tape 80 is “Flamen Tape (registered trademark)” NO. 9550 was used. The adhesive tape 80 used has a tensile strength of 320 N / 10 mm and an adhesive strength of 10 N / 10 mm (both tensile strength and adhesive strength are determined by the “Slion method”). The adhesive tape 80 is attached in a range of 400 mm in the longitudinal direction of the material (“L” shown in FIG. 3) and about 180 mm in the width direction of the material (“W” shown in FIG. 3). Molding was performed by evenly pasting the preceding material 21 and the succeeding material 31. The “Slion method” is a standard based on JIS-Z-0237 (2009).

  According to the roll forming method according to the first embodiment, in the cold roll forming line 100, it is a simple operation of simply sticking the adhesive tape 80, and the operator does not particularly need qualifications and skills, and the preceding material 21 And subsequent material 31 can be connected. Conventionally, the preceding material 21 and the succeeding material 31 are connected by welding. However, according to the first embodiment, there is no thermal effect and contamination due to welding, and the cold roll forming line 100 is necessary for welding. It is no longer necessary to install a new facility. As a result, the work time required for the connection work at the time of material replacement in the cold roll forming line 100 can be shortened, so that the productivity of the molded product 50 can be improved.

[Embodiment 2]
The second embodiment is obtained by changing the pasting area of the adhesive tape 80 that has been pasted on the first embodiment. In the following embodiment, the description will be focused on the changes made to the first embodiment. Other configurations are the same as those in the first embodiment.

  Fig.5 (a) is explanatory drawing which shows the connection part of the material at the time of coil replacement | exchange in Embodiment 2 of this invention. FIG.5 (b) is sectional drawing which shows the AA cross section of Fig.5 (a). The preceding material 221 and the succeeding material 231 are connected as shown in FIG. The adhering positions of the adhesive tapes 280a and 280b cover both ends of the preceding material 221 and the succeeding material 231 in the width direction, and are folded and pasted from the front surface to the back surface of the material. The adhesive tapes 280a and 280b also cover end surfaces on the side surface side of the material at both ends in the width direction of the material, and are attached to both the front and back surfaces. Therefore, even when the end of the preceding material 221 and the tip of the succeeding material 231 are displaced in different directions in the cold roll forming line 100, the displacement can be suppressed, and the adhesive tapes 280a and 280b Peeling can also be prevented. In the second embodiment as well, the adhesive tapes 280a and 280b are attached to the non-deformable portion 52.

(Effect of Embodiment 2)
In addition, based on Embodiment 2, the preceding material 221 and the succeeding material 231 are connected with the adhesive tape 280 in the cold roll forming line 100, the processing is performed, and the succeeding material 31 is cold after the preceding material 21 without any problem. It could be introduced into the roll forming line 100. Molding in the cold roll forming line 100 was performed under the following conditions. The molded material is a steel plate for a deck plate that is galvanized as in the first embodiment. The thickness is 1.2 mm (t shown in FIG. 2), the height after molding is 13.5 mm (h shown in FIG. 2), and the plate width is 289 mm for both the preceding material 221 and the succeeding material 231. As in the first embodiment, the adhesive tape 80 is a “Flamen Tape (registered trademark)” NO. 9550 was used. The adhesive tape 80 used has a tensile strength of 320 N / 10 mm and an adhesive strength of 10 N / 10 mm (both tensile strength and adhesive strength are determined by the “Slion method”). The adhesive tape 80 is attached in a range of 400 mm (“L” shown in FIG. 5A) in the longitudinal direction of the material. About the width direction of material, it is affixed so that the non-deformation part whole region of the surface (upper surface of material in the cold roll forming line 100) may be covered ("Wa" and "" shown in FIG.5 (b)). Wb "). If the back surface of the material (the lower surface of the material in the cold roll forming line 100) is attached to a range of at least about 10 mm, the subsequent material 231 can be introduced into the roll forming machine 12, It is more advantageous if they are applied in the same range.

  Further, in the second embodiment, the preceding material 221 and the succeeding material 231 are separated in the cold roll forming line 100 even under the condition that the plate widths of the preceding material 221 and the succeeding material 231 are changed to 189 mm with respect to the above conditions. Connected and processed. Then, the succeeding material 31 could be introduced into the cold roll forming line 100 following the preceding material 21 without any problem.

  According to the roll forming method according to the second embodiment, it is possible to firmly connect the preceding material 221 and the succeeding material 231 while obtaining the same effects as those of the first embodiment. Thereby, even if the tensile force generated between the roll sets 12a to 12i in the roll forming machine 12 is increased or the material is displaced in the vertical direction, the adhesive tape 80 at the connecting portion of the material is peeled off or cut. There is nothing to do. That is, the subsequent material 231 can be more reliably introduced into the cold roll forming line 100.

  In the second embodiment, the adhesive tapes 280a and 280b are attached to two locations, but the preceding material 221 and the succeeding material 231 may be connected in a state where only one of them is attached. In addition, the preceding material 221 and the succeeding material 231 are connected in the adhesive tape application region in which one of the adhesive tapes 280a and 280b described in the second embodiment is combined with the adhesive tape 80 of the first embodiment. May be.

  DESCRIPTION OF SYMBOLS 10 Uncoiler, 11 Leveler, 12 Roll forming machine, 12a-12i Roll set, 13 Cutting machine, 14 Picking table, 20 Coil, 21 Prior material, 21a Side end, 30 Coil, 31 Subsequent material, 31a Side end, 50 Molded product, 51 deformed part, 52 non-deformed part, 60 upper roll, 60a upper roll, 60b upper roll, 61 lower roll, 61a lower roll, 61a lower roll, 80 adhesive tape, 90 (indicating tensile force) arrow, 100 Cold roll forming line, 221 preceding material, 231 following material, 280a adhesive tape, 280b adhesive tape.

Claims (11)

The strip-shaped leading material is
Roll formed by a roll forming machine,
The subsequent material in the form of a strip is
A roll forming method in which a front end portion is connected to an end portion of the preceding material by an adhesive tape, and is introduced into the roll forming machine following the preceding material. The end portion of the preceding material and the tip portion of the subsequent material are:
The roll forming method according to claim 1, wherein the roll forming methods are connected in a state where the end faces are butted. The preceding material and the subsequent material are:
The roll forming method according to claim 1, wherein the roll forming metal is a strip-shaped metal wound in a coil shape. The roll forming machine
Provided with a forming roll that transforms the introduced material into a predetermined shape,
The adhesive tape is
Either of the preceding material and the leading material of the succeeding material are pasted across the end portion, and the leading material and the succeeding material are pasted on a portion that is not deformed by a forming roll. 2. The roll forming method according to item 1. The adhesive tape is
The roll forming method according to claim 1, wherein the roll forming method is applied from a front surface to a back surface at side end portions of the preceding material and the subsequent material. The preceding material and the subsequent material are:
The board width is different,
One side end in the width direction of the preceding material is
The roll forming method according to claim 1, wherein the roll forming method is connected so as to come on an extension line of one side end portion in the width direction of the subsequent material. The leading end of the preceding material and the leading end of the succeeding material are:
The roll forming method according to claim 1, wherein the roll forming method is connected after being cut by a predetermined length. The adhesive tape is
The roll forming method according to claim 1, wherein the base material contains at least one of glass fiber and resin fiber. The glass fiber and the resin fiber are
The roll forming method according to claim 8, wherein the preceding material and the subsequent material are arranged along a direction in which the preceding material flows in the roll forming machine. The glass fiber and the resin fiber are
Furthermore, the roll forming method according to claim 9, wherein the preceding material and the succeeding material are arranged along a direction perpendicular to a direction in which the material flows in the roll forming machine. The adhesive tape is
The roll forming method according to any one of claims 1 to 10, wherein the tensile strength is 320 N / 10 mm or more and the adhesive strength is 10 N / 10 mm or more.

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