JP2023145858A - Apparatus and method for forming annular adhesive sheet - Google Patents

Abstract

To provide an apparatus and a method for forming an annular adhesive sheet that allow for easily removing an annular adhesive sheet formed by being held by sheet holding means from the sheet holding means.SOLUTION: An apparatus for forming an annular adhesive sheet EA comprises supply means 10 that supplies an adhesive sheet AS in an outwardly-extending direction SD directed from a front end ASF of the adhesive sheet AS to a rear end ASR and sheet holding means 20 that abuts against an anti-adhesive surface AS2 opposite to an adhesive surface AS1 of the adhesive sheet AS supplied by the supply means 10, superposes the front end ASF and the rear end ASR together to form a superposition ASP, and makes the adhesive sheet AS annular to form an annular adhesive sheet ASC. The sheet holding means 20 abuts against one end side ASA only of the adhesive sheet AS in the outwardly-extending direction SD and forms a protruding region ASH at the other end side ASB of the adhesive sheet AS in the outwardly-extending direction SD into the annular adhesive sheet ASC.SELECTED DRAWING: Figure 1

Description

The present invention relates to an annular adhesive sheet forming apparatus and an annular adhesive sheet forming method.

2. Description of the Related Art A device is known that includes a sheet holding means that holds the adhesive sheet by coming into contact with the non-adhesive surface side of the adhesive sheet, which is the side opposite to the adhesive surface (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 2012-206757

In the annular adhesive sheet forming device 1 (annular adhesive sheet forming device) described in Patent Document 1, one end edge S3 (front end portion) and the other end edge S4 (rear end portion) of the adhesive sheet S (adhesive sheet) are overlapped. When trying to form a circular adhesive sheet together, the entire non-adhesive surface of the adhesive sheet, which is the side opposite to the adhesive surface, comes into contact with the application head 2 (sheet holding means), so the formed circular adhesive sheet becomes difficult to remove from the sheet holding means.

An object of the present invention is to provide an annular adhesive sheet forming apparatus and an annular adhesive sheet forming method that allow easy removal of a formed annular adhesive sheet held by a sheet holding means from the sheet holding means.

The present invention employs the configuration described in the claims.

According to the present invention, since the annular adhesive sheet is formed by contacting only one end side of the adhesive sheet along the extending direction and forming a protruding area on the other end side of the adhesive sheet along the extending direction, the sheet is held. The annular adhesive sheet formed by being held by the means can be easily removed from the sheet holding means.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of an annular adhesive sheet forming device and an operation diagram of the device according to an embodiment of the present invention. FIG. 7 is an explanatory diagram of an annular adhesive sheet forming apparatus according to a modified example.

Hereinafter, one embodiment of the present invention will be described based on the drawings.
Note that the X-axis, Y-axis, and Z-axis in this embodiment are orthogonal to each other, and the X-axis and Y-axis are axes within a predetermined plane, and the Z-axis is an axis perpendicular to the predetermined plane. do. Furthermore, in this embodiment, when viewing from the arrow DR direction parallel to the Y-axis as a reference, and when directions are indicated without specifying a figure, "up" is the direction of the Z-axis arrow and "down" is the direction of the arrow. In the opposite direction, "left" is the direction of the arrow on the X-axis, "right" is the opposite direction, "front" is the front direction in FIG. 1 parallel to the Y-axis, and "rear" is the opposite direction. Note that since FIGS. 1(C) to (F) are views viewed from the same direction as FIG. 1(B), arrows indicating directions are omitted.

The annular adhesive sheet forming apparatus EA of the present invention includes a supplying means 10 that performs a supplying step of supplying the adhesive sheet AS along an extending direction SD from the leading end ASF to the rear end ASR of the adhesive sheet AS; The adhesive sheet AS is brought into contact with the anti-adhesive surface AS2, which is the opposite side of the adhesive surface AS1, of the adhesive sheet AS supplied by the means 10, and overlaps the leading end ASF and the rear end ASR to form an overlapping part ASP. Sheet holding means 20 carries out a sheet holding step of making AS into a ring to form an annular adhesive sheet ASC, and a crimping step is carried out to mutually press the overlapping portion ASP of the annular adhesive sheet ASC held by the sheet holding means 20. The pressure bonding means 30 and the energy applying means 40 perform an energy applying step of applying heat as predetermined energy to the adhesive sheet AS held by the sheet holding means 20 and deforming the adhesive sheet AS into a predetermined shape. We are prepared.
Note that the adhesive sheet AS of this embodiment is one that can be deformed by heat as predetermined energy.

The supply means 10 is configured to feed out a raw fabric RS with an adhesive sheet AS temporarily attached to a release sheet RL, peel the release sheet RL from the raw fabric RS, and supply the adhesive sheet AS. That is, the supply means 10 includes a base member 11 that directly or indirectly supports each member constituting the supply means 10, a support roller 12 that supports the raw fabric RS, and a guide roller 13 that guides the raw fabric RS. , a peeling plate 14 as a peeling means for folding back the release sheet RL at the peeling edge 14A and peeling the adhesive sheet AS from the release sheet RL; supported by an output shaft (not shown) of a rotating motor 15A as a driving device; Peeling that exists between the drive roller 15 that pinches the release sheet RL between the drive roller 15B and the pinch roller 15B, which is supported by the output shaft of a drive device (not shown), and during automatic operation of the annular adhesive sheet forming apparatus EA. A collection roller 16 is provided as a collection means that always applies a predetermined tension to the sheet RL and collects the release sheet RL.

The sheet holding means 20 includes a rotary motor 21 as a driving device, a cylindrical sheet holding member 22 supported by its output shaft 21A, and the sheet holding member 22, and holds the leading end ASF of the adhesive sheet AS. The adhesive sheet AS is provided with a suction hole 23 and a decompression means 24 (holding means) such as a decompression pump or a vacuum ejector that applies suction force to the suction hole 23, and contacts only one end side ASA of the adhesive sheet AS along the extension direction SD. , an annular adhesive sheet ASC is formed by forming a protruding area ASH on the other end side ASB of the adhesive sheet AS along the extension direction SD.
The sheet holding member 22 is provided with an opening of a suction hole 23, and is located above the sheet holding surface 22A, which abuts one end side ASA of the adhesive sheet AS to hold the adhesive sheet AS, and the sheet holding surface 22A, It includes an upper surface 22B connected to the output shaft 21A of the rotation motor 21, and a lower surface 22C located below the sheet holding surface 22A.

The crimping means 30 includes a linear motor 31 as a driving device, a crimping member 32 supported by its output shaft 31A, a linear motor 33 as a driving device, and a crimping member 34 supported by its output shaft 33A. It is equipped with Note that the surface of the pressure bonding member 34 facing the pressure bonding member 32 is subjected to a non-adhesive treatment so that it does not adhere to the adhesive surface AS1 on which fluororesin, silicone, etc. are laminated.

The energy imparting means 40 includes a heating device 41 such as a coil heater or a heating side of a heat pipe.
In this embodiment, the energy applying means 40 deforms the protruding area ASH in the direction of the lower surface 22C of the sheet holding member 22 by applying heat to the protruding area ASH.

The operation of the above annular adhesive sheet forming apparatus EA will be explained.
First, a user (hereinafter simply referred to as "user") of the annular adhesive sheet forming apparatus EA (hereinafter simply referred to as "user") sets the annular adhesive sheet forming apparatus EA in which each member is placed at the initial position shown by the solid line in FIG. 1(A). After setting the original fabric RS as shown in the figure, a signal to start automatic operation is inputted via an operation means (not shown) such as an operation panel or a personal computer. Then, the supply means 10 drives the rotary motor 15A to feed out the original fabric RS, so that the leading end ASF of the first adhesive sheet AS is aligned with the peeling edge 14A of the peeling plate 14, as shown by the solid line in FIG. 1(A). When the predetermined length is peeled off, the rotation motor 15A stops driving.

Next, the supply means 10 drives the rotary motor 15A to feed out the original fabric RS, so that the leading end ASF of the adhesive sheet AS reaches the suction hole as shown in the chain double-dashed line in FIG. 1(A) and in FIG. 1(B). 23, the rotation motor 15A stops driving. Thereafter, the sheet holding means 20 drives the pressure reducing means 24, and starts sucking and holding the leading end ASF of the adhesive sheet AS through the suction hole 23, as shown in FIG. 1(C). Next, the supplying means 10 and the sheet holding means 20 drive the rotation motors 15A and 21 to rotate the sheet holding member 22 in the clockwise direction RD when viewed from above while supplying the adhesive sheet AS. Wrap the adhesive sheet AS around 22. As a result, one end side ASA of the adhesive sheet AS comes into contact with the sheet holding surface 22A, and the adhesive sheet AS is held by the sheet holding member 22, and the other end side ASB of the adhesive sheet AS that is not held by the sheet holding surface 22A. This becomes a protruding area ASH.

Then, the rotation of the sheet holding member 22 continues, and as shown in FIG. 1(D), the adhesive surface AS1 of the leading end ASF of the adhesive sheet AS and the anti-adhesive surface AS2 of the trailing end ASR of the adhesive sheet AS. When the annular adhesive sheet ASC is formed by adhering and forming the overlapping portion ASP, the sheet holding means 20 stops driving the rotation motor 21. Note that when the leading end ASF of the next adhesive sheet AS following the first adhesive sheet AS is peeled off by a predetermined length at the peeling edge 14A of the peeling plate 14, the supply means 10 stops driving the rotation motor 15A. Next, the crimping means 30 drives the linear motor 33, and after crimping the one end side ASA in the overlapping portion ASP with the crimping member 34 and the sheet holding member 22, as shown in FIG. 1(E), the linear motor 31 The crimping members 32 and 34 press the other end ASB of the overlapping portion ASP, and after the crimping is completed, the crimping members 32 and 34 are returned to their initial positions.

Thereafter, the energy applying means 40 drives the heating device 41 to start heating the protruding area ASH, and the sheet holding means 20 drives the rotation motor 21 to rotate the sheet holding member 22. As a result, the annular adhesive sheet ASC that has passed above the heating device 41 is deformed by the heat generated by the heating device 41, and as shown in FIG. It bends. Next, when the entire protruding area ASH is bent toward the lower surface 22C of the sheet holding member 22, the sheet holding means 20 and the energy applying means 40 stop driving the rotary motor 21 and the heating device 41, and then the sheet holding means 20 The drive of the pressure reducing means 24 is stopped, and the adsorption/holding of the leading end ASF of the adhesive sheet AS is released. Then, when the user or a conveying means (not shown) supports the annular adhesive sheet ASC and removes it from the sheet holding member 22, and conveys the removed annular adhesive sheet ASC to the next process, the sheet holding means 20 drives the rotation motor 21. , the sheet holding member 22 is returned to the initial position, and the same operation as described above is repeated thereafter.

According to the embodiments described above, the adhesive sheet contacts only one end side ASA of the adhesive sheet AS along the extension direction SD, and the protruding area ASH is formed on the other end side ASB of the adhesive sheet AS along the extension direction SD. Since the annular adhesive sheet ASC is formed by using the annular adhesive sheet ASC, the annular adhesive sheet ASC held and formed by the sheet holding means 20 can be easily removed from the sheet holding means 20.
Note that in the above embodiment, the annular adhesive sheet ASC was removed from the sheet holding means 20 after bending the protruding area ASH toward the lower surface 22C of the sheet holding member 22; The annular adhesive sheet ASC may be removed from the sheet holding means 20 before being bent, and in this case also the same effect as described above can be obtained.

The means and steps in the present invention are not limited in any way as long as they can perform the operations, functions, or steps described with respect to the means and steps; It is not limited to the process at all. For example, the supplying means may be of any type as long as it can supply the adhesive sheet along the extending direction from the leading end to the rear end, and the supplying means may be of any type as long as it can supply the adhesive sheet along the extending direction from the leading end to the rear end. There is no limitation as long as it falls within the range (the same applies to other means and steps).

The supply means 10 is provided by forming a closed loop cut or a notch in the entire width direction of the short dimension in the band-shaped adhesive sheet base material temporarily attached to the band-shaped release sheet RL, thereby supplying a predetermined area partitioned by the cut. The adhesive sheet AS may be peeled off and supplied from the original fabric RS which has been made into the adhesive sheet AS, or a band-shaped adhesive sheet original fabric in which a band-shaped adhesive sheet base material is temporarily attached to a band-shaped release sheet RL is used. Then, in the middle of unwinding the belt-shaped adhesive sheet raw material, a cut in the adhesive sheet base material in a closed loop shape or across the entire short width direction is formed with a cutting blade serving as a cutting means, and a predetermined area partitioned by the cut is formed. The adhesive sheet AS may be peeled off and supplied from the original fabric RS on which the adhesive sheet AS is made, or the adhesive sheet AS may be peeled off from the original fabric RS on which the adhesive sheet AS is temporarily attached to the release sheet RL. The sheet AS may be peeled off and supplied, or the adhesive sheet AS may be peeled off and fed from the fan-folded original fabric RS without being wound, for example, or without being wound. For example, a collection means for collecting the release sheet RL by fan-folding it, cutting it into pieces with a shredder, etc., or randomly accumulating it, or it is not necessary to adopt a collection means, or the release sheet RL The adhesive sheet AS that is not temporarily attached to the RL may be fed out.
As shown in FIG. 2, the supply means 10 may be configured to supply the adhesive sheet AS with the release sheet RL temporarily attached to the overlapping portion ASP in the rear end portion ASR. In this case, before the trailing end ASR is bonded to the adhesive surface AS1 of the leading end ASF, the supply means 10 drives the rotation motor 15A to rotate the drive roller 15 in the direction in which the release sheet RL is fed out from the collection roller 16. let As a result, as shown in FIG. 2(A), the overlapping portion ASP in the rear end portion ASR is covered with the release sheet RL. Next, in the same manner as in the above embodiment, the crimping means 30 drives the direct-acting motors 31 and 33, and as shown in FIG. After crimping the side ASA, the crimping member 32 and the crimping member 34 crimp the other end side ASB of the overlapping portion ASP. Thereafter, the crimping means 30 drives the linear motors 31 and 33 to return the crimping members 32 and 34 to their initial positions, and then the supplying means 10 drives the rotary motor 15A and the release sheet RL is moved by the collecting roller 16. The drive roller 15 is rotated in the winding direction, and the release sheet RL is peeled off from the rear end portion ASR of the adhesive surface AS1, as shown in FIG. 2(C). With such a configuration, when the overlapping portion ASP is crimped with the crimping member 34, it is possible to prevent the adhesive surface AS1 of the rear end portion ASR from adhering to the crimping member 34, and also prevent the crimping in the crimping member 34. There is no need to perform non-adhesive treatment on the surface facing the member 32.

The sheet holding means 20 may move the supply means 10 without or while rotating the sheet holding member 22 and wrap the adhesive sheet AS around the sheet holding member 22, or may have a truncated conical shape or a truncated pyramid shape. The sheet holding member 22 may have a shape such as an elliptical columnar shape, a polygonal columnar shape such as a triangle or a square, a flat plate shape, a spherical shape, a hemispherical shape, or any other shape. Hold the sheet AS, contact only one end side (the other end ASB side in the above embodiment) of the adhesive sheet AS along the extending direction SD, and contact the other end side (the other end side ASB side in the above embodiment) of the adhesive sheet AS along the extending direction SD. In the above embodiment, the annular adhesive sheet ASC may be formed by forming a protruding area ASH on the one end side (ASA side), and the outer edge shape of at least one of the upper surface 22B and lower surface 22C of the sheet holding member 22 may be, for example, , a circular shape, an elliptical shape, a polygonal shape such as a triangular or square shape, or other shapes, and instead of or in combination with the configuration for suctioning and holding the tip ASF, for example, a so-called chuck motor as a driving device can be used. A configuration may be adopted in which the tip ASF is held with a chuck cylinder or the like, or a device that sprays a liquid such as water or a mixed liquid, or a gas such as air or a mixed gas, or adheres it to the adhesive surface AS1 of the adhesive sheet AS. The adhesive sheet AS supplied from the supply means 10 may be pressed against the sheet holding member 22 by using a sheet pressing means composed of a roller or the like that has been subjected to a non-adhesive treatment. The annular adhesive sheet ASC supported by a robot or the like and held by the sheet holding member 22 is conveyed to a predetermined position, and the annular adhesive sheet ASC held by the sheet holding member 22 is affixed to a predetermined adherend. You may also

The crimping means 30 is a so-called chuck motor or a chuck cylinder as a driving device instead of the two direct-acting motors 31 and 33, and is used to press the overlapped portion ASP of the annular adhesive sheet ASC held by the sheet holding means 20. Alternatively, the overlapping portions ASP of the annular adhesive sheets ASC held by the sheet holding means 20 may be pressed together by spraying a liquid such as water or a mixed liquid or a gas such as air or a mixed gas. Alternatively, after the protruding area ASH is deformed in the direction of the lower surface 22C of the sheet holding member 22 by the energy applying means 40, the overlapping parts ASP of the annular adhesive sheets ASC held by the sheet holding means 20 are pressed together. Alternatively, the crimping member 32 and the crimping member 34 may crimp the other end side ASB in the overlapping portion ASP, and the one end side ASA in the overlapping portion ASP may not be crimped, or the crimping member 34 and the sheet holding member 22 The one end side ASA in the overlapping part ASP may be crimped, and the other end side ASB in the overlapping part ASP may not be crimped, the direct drive motor 31 and the crimping member 32 may not be employed, and the present invention The annular adhesive sheet forming apparatus EA may or may not be provided with it.

The energy applying means 40 applies heat to the protruding area ASH while wrapping the adhesive sheet AS around the sheet holding member 22, avoiding the tip part ASF, and applies heat to the overlapping part ASP after the overlapping part ASP is formed. By doing so, the protruding area ASH may be deformed in the direction of the lower surface 22C of the sheet holding member 22, or the protruding area ASH may be deformed or the protruding area may be deformed so that the protruding area ASH comes into contact with the lower surface 22C of the sheet holding member 22. The protruding area ASH may be deformed so that the ASH does not come into contact with the lower surface 22C of the sheet holding member 22, or electromagnetic waves such as ultraviolet rays, infrared rays, visible rays, sound waves, X-rays, or gamma rays may be used as predetermined energy. It is also possible to apply hot water, hot air, cold water, cold air, etc., and the predetermined energy can be arbitrarily determined in consideration of the characteristics, properties, properties, materials, composition, composition, etc. of the adhesive sheet AS. A predetermined value can be applied to the adhesive sheet AS, taking into account various conditions such as the characteristics, properties, properties, materials, composition, structure, shape, dimensions and weight of the adhesive sheet AS, atmospheric conditions, and other factors. The amount and strength of energy can be arbitrarily changed, a predetermined energy may be applied to the entire protruding area ASH at once, or, for example, it may be placed inside the sheet holding member 22. However, it may or may not be included in the annular adhesive sheet forming apparatus EA of the present invention.

The adhesive sheet AS may be one that can be deformed using electromagnetic waves such as ultraviolet rays, infrared rays, visible light, sound waves, X-rays, or gamma rays, or heat such as hot water, hot air, cold water, or cold air, or may be deformable by using predetermined energy. It may be a material that deforms with contraction, a deformation with expansion, a deformation without contraction or expansion, or a material that does not deform with predetermined energy.

The materials, types, shapes, etc. of the adhesive sheet AS and the adherend in the present invention are not particularly limited. For example, the adhesive sheet AS and the adherend may have a circular shape, an oval shape, a polygonal shape such as a triangle or a quadrangular shape, or other shapes, and the adhesive sheet AS may have an adhesive such as a pressure-sensitive adhesive or a heat-sensitive adhesive. If a heat-sensitive adhesive sheet AS, a support tape ST, and another adhesive sheet are adopted, a suitable heating means such as a coil heater or the heating side of a heat pipe may be used to heat them. It may be bonded by an appropriate method such as by providing a. In addition, such adhesive sheets AS include, for example, a single-layer adhesive sheet with only an adhesive layer, a two-layer adhesive sheet with a base material and an adhesive layer laminated, and a single-layer adhesive sheet AS with an adhesive layer between the base material and the adhesive layer. Three layers or three or more layers in which multiple intermediate layers are laminated, three or more layers in which one or more cover layers are laminated on the top surface of a base material, a base material, an intermediate layer, or a cover layer. Any type of material may be used, such as a removable sheet, a single-layer double-sided adhesive sheet consisting only of an adhesive layer, or a double-sided adhesive sheet with adhesive layers laminated on both outermost surfaces of one or more intermediate layers. . Furthermore, the adherends include, for example, foods, resin containers, semiconductor wafers such as silicon semiconductor wafers and compound semiconductor wafers, circuit boards, information recording substrates such as optical disks, single bodies such as glass plates, steel plates, ceramics, wood plates, and resins. It may be an object or a composite formed of two or more of them, and members or articles of any form can also be targeted. Note that the adhesive sheet AS can be used for any purpose such as an information label, a decorative label, a protective sheet, a dicing tape, a die attach film, a die bonding tape, a recording layer forming resin sheet, etc. It may be a sheet, film, tape, etc.

The driving equipment in the above embodiment includes a rotary motor, a direct-acting motor, a linear motor, a single-axis robot, an electric equipment such as an articulated robot with joints of two or three or more axes, an air cylinder, a hydraulic cylinder, and a rodless cylinder. Actuators such as cylinders and rotary cylinders can be used, and a direct or indirect combination of these can also be used.
In the above embodiment, when a rotating member such as a roller is employed, a driving device for rotationally driving the rotating member may be provided, or the surface of the rotating member or the rotating member itself may be made of deformable material such as rubber or resin. It may be made of a member, the surface of the rotating member or the rotating member itself may be made of a member that does not deform, or other members such as rotating or non-rotating shafts or blades may be used instead of the roller. Alternatively, if a peeling means such as a peeling plate or a peeling roller or a peeling member that peels off the object to be peeled is used, a plate-like member, a round bar, etc. may be used instead of or in combination with the above-mentioned examples. , a member such as a roller may be employed, the peeling member may be made of a deformable member such as rubber or resin, or a member that does not deform, and a supporting (holding) means may be used. If a device that supports (holds) the supported member (held member), such as a It is also possible to adopt a structure in which the supported member is supported (held) using tape), adhesive (adhesive sheet, adhesive tape), magnetic force, Bernoulli adsorption, suction adsorption, drive equipment, etc.; If a device that cuts the material to be cut or forms a cut or a cutting line in the material to be cut is used, a cutter blade, laser cutter, ion beam, thermal power, or It is also possible to use a method that uses heat, water pressure, heating wire, spraying of gas, liquid, etc. to cut the material, or to move the material to be cut using a combination of appropriate drive equipment. .

EA...Annular adhesive sheet forming device 10...Supplying means 20...Sheet holding means 30...Crimping means 40...Energy applying means AS...Adhesive sheet ASA...One end side ASB...Other end side ASC...Annular adhesive sheet ASF...Tip portion ASH...Protrusion Area ASP...overlapping part ASR...rear end AS1...adhesive surface AS2...anti-adhesive surface RL...release sheet RS...original fabric SD...extending direction

Claims (5)

A supply means for supplying the adhesive sheet along an extending direction from the leading end to the rear end of the adhesive sheet;
The adhesive sheet is brought into contact with the non-adhesive surface side opposite to the adhesive surface of the adhesive sheet supplied by the supplying means, the leading end portion and the rear end portion are overlapped to form an overlapping portion, and the adhesive sheet is shaped into an annular shape. An annular adhesive sheet forming apparatus comprising: a sheet holding means for forming an annular adhesive sheet;
The sheet holding means contacts only one end side of the adhesive sheet along the extending direction, and forms a protruding area at the other end side of the adhesive sheet along the extending direction, thereby forming the annular adhesive sheet. An annular adhesive sheet forming device characterized by: 2. The annular adhesive sheet forming apparatus according to claim 1, further comprising a pressure-bonding means for mutually pressure-bonding the overlapping portions of the annular adhesive sheets held by the sheet holding means. The supplying means is configured to feed out a raw material on which the adhesive sheet is temporarily attached to a release sheet, peel the release sheet from the raw material, and supply the adhesive sheet, and to supply the adhesive sheet to the overlapping portion at the rear end. 3. The annular adhesive sheet forming apparatus according to claim 1, wherein the adhesive sheet is supplied with the release sheet temporarily attached. The adhesive sheet is provided to be deformable by a predetermined energy,
Claims 1 to 3, further comprising energy applying means for applying the predetermined energy to the adhesive sheet held by the sheet holding means and deforming the adhesive sheet into a predetermined shape. The annular adhesive sheet forming device according to any one of the above. a supplying step of supplying the adhesive sheet along an extending direction from the leading end to the rear end of the adhesive sheet;
The adhesive sheet is brought into contact with the non-adhesive surface side opposite to the adhesive surface of the adhesive sheet supplied in the supply step, the leading end portion and the rear end portion are overlapped to form an overlapping portion, and the adhesive sheet is shaped into an annular shape. In a method for forming an annular adhesive sheet, the method comprises:
In the sheet holding step, the adhesive sheet is held by contacting only one end side of the adhesive sheet along the extending direction and forming a protruding area on the other end side of the adhesive sheet along the extending direction. A method for forming an annular adhesive sheet characterized by: