Dust removal adhesive roll and method for manufacturing the same

Abstract

To provide an adhesive roll for dust removal which has a cutting line that is easy to peel off, is useful with little waste of resources, and can be manufactured with good workability. [Solution] A roll is formed by winding a long strip of adhesive tape, the tape having an adhesive surface on one side of the base material, around a cylindrical core, and multiple linear cutting lines are formed across the entire width of the adhesive tape at different intervals along the length of the tape. During use, the roll is peeled starting from the cutting line on the top surface of the roll to the next cutting line, successively exposing new adhesive surface on the top surface of the roll and removing foreign matter adhered to the target object. The linear cutting lines are straight or wavy, forming angles of 1 to 30 degrees, and the positions of the cutting lines are such that the length of one strip of adhesive tape gradually increases from the core outward, and when the roll is formed, the overlapping portion of one adhesive tape formed from the start point of peeling to the end point of peeling is short, at 1 to 20 mm, for any strip of adhesive tape peeled from the roll.

Description

[Technical Field]

[0001] The present invention relates to a dust-removing adhesive roll and a method for manufacturing the dust-removing adhesive roll, and more particularly to a dust-removing adhesive roll suitable for a method of removing foreign matter such as dust and material debris adhering to the surface of printed circuit boards, which are widely used in the manufacturing fields of various products, by contacting the adhesive surface of an adhesive tape constituting the dust-removing adhesive roll with the roll and transferring the foreign matter and dirt to the adhesive surface, and then peeling off the dirty and reduced adhesive strength portion of the adhesive tape up to the next cutting line to expose a new adhesive surface, thereby restoring the foreign matter removal performance of the adhesive surface of the adhesive tape and allowing subsequent use. [Background technology]

[0002] In recent years, it is no exaggeration to say that printed circuit boards are used in all industrial fields, and the demand for them is increasing, resulting in an increase in the number of products.Due to the special nature of the products, printed circuit boards must be clean, so foreign matter such as dust and material residue adhering to the surface of printed circuit boards is removed using cleaning machinery.

[0003] Dust removal methods using cleaning machines include contact and non-contact methods. Non-contact devices use compressed air to blow away foreign matter from the surface of an object, which has the advantage of being less likely to damage the surface. However, they are inferior in removing foreign matter compared to contact devices and also have the problem of consuming a large amount of power. On the other hand, contact devices adsorb foreign matter from the surface of an object and transfer the foreign matter to an adhesive roll for removal. Although there is a concern that the surface of the object may be damaged when adsorbing foreign matter, depending on the material, contact devices have excellent foreign matter removal capabilities and are more cost-effective than non-contact devices, offering a major industrial advantage in that they make dust removal economical. The technology proposed in this invention relates to an adhesive roll for dust removal used when cleaning the surface of an object using a contact method.

[0004] In contact-type cleaning devices, to reduce the risk of damaging the surface of the object, foreign matter such as dust and material debris adhering to the surface of a printed circuit board is adsorbed onto a rubber roll, and the foreign matter adsorbed to the rubber roll is transferred to the adhesive surface of a long adhesive tape formed by forming an adhesive layer on one side of a substrate, thereby cleaning the surface of the object. The adhesive tape is then cut off from the portion where the foreign matter has been transferred, resulting in a decrease in adhesive strength. This sequentially exposes a new adhesive surface, allowing the next foreign matter to be transferred onto the adhesive surface in good condition, enabling continuous dust removal. Meanwhile, as mentioned above, a long adhesive tape is required to efficiently and continuously perform a good dust removal process on the mass-used printed circuit boards that are the object of dust removal. Therefore, a long adhesive tape is wound around a core to form an adhesive roll and used for dust removal. To improve the convenience of removing dirty adhesive surfaces after use, it has been proposed to pre-cut the long adhesive tape. Pre-cutting the cutting line allows for easy cutting of a portion of the long adhesive tape.

[0005] For example, Patent Document 1 proposes an adhesive dust removal roll in which a tape of a fixed width having an adhesive layer on one surface is provided with a plurality of discontinuous score lines extending in the width direction, the discontinuous score lines being formed so that the intervals between the discontinuous score lines become successively longer so that the discontinuous score lines are located in approximately the same positions when the tape is wound around a core with the adhesive layer facing outward, and the tape is then wound around the core.

[0006] Patent Document 2 proposes a method for manufacturing a dust-removing roll suitable for removing dust adhering to printed circuit boards. Specifically, the proposed technology includes a step of forming a plurality of continuous cutting lines (continuous cutting lines) extending widthwise from a central portion of a raw adhesive tape wider than the adhesive tape, leaving portions (uncut portions) at a predetermined distance from each end, with the spacing between the continuous cutting lines increasing progressively toward the outer periphery so that the continuous cutting lines overlap at approximately the same positions when the raw adhesive tape is wound around a core. In this technology, the uncut portions at both ends of the raw adhesive tape are cut off from the raw roll to form a plurality of continuous cutting lines extending widthwise from end to end at predetermined intervals in the winding direction, and the spacing between the continuous cutting lines is gradually increased progressively toward the outer periphery so that the continuous cutting lines overlap at approximately the same positions when the adhesive tape is wound around the core. By doing this, it is possible to form a dust removal roll in which the cut portions of the continuous cutting lines are tightly adhered without protruding vertically from the outer surface (adhesive surface) and without spreading in the winding direction. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-61884 [Patent Document 2] Patent No. 3016730 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the adhesive dust removal roll described in Patent Document 1 is rolled over carpets, floors, etc. to clean dust, and the tape having an adhesive layer has discontinuous score lines, which require a cumbersome operation of cutting along the lines when removing the soiled tape. Furthermore, in addition to the cumbersome operation, the printed circuit boards that are the target of dust removal in the present invention need to have their surfaces cleaned to an extremely clean state, and with a structure in which the tape is cut using discontinuous score lines like those in the adhesive dust removal roll, there is a concern that material debris may be generated and adhere to the target object during cutting.

[0009] In contrast to the above, in the method for manufacturing a dust removal roll described in Patent Document 2, the tape is pre-cut along a continuous cutting line provided in the width direction of the adhesive tape, so that portions of the adhesive tape that have become soiled by the transfer of foreign matter can be easily cut and removed. In response to this, the present inventors recognized that although the presence of a continuous cutting line provided in advance on a long adhesive tape is significantly more convenient than cutting the adhesive tape with a knife or the like every time the adhesive surface becomes soiled, the tape will always be cut at the position of the pre-set cutting line, and therefore the design of the cutting line must take all factors into consideration. Based on this recognition, they conducted a study of the prior art.

[0010] The technology described in Patent Document 2 aims to ensure that the cut portions of the continuous cutting lines in the state of the dust removal roll do not bulge vertically from the outer surface and do not spread in the winding direction, remaining in close contact, as shown in the accompanying drawings in Figure 5. For this reason, as shown in the accompanying drawings in Figure 2, the dust removal roll is formed so that the positions of multiple continuous cutting lines provided for peeling and cutting off the long adhesive tape wound around the core into individual pieces (single sheets) are in approximately the same position (i.e., lined up in a row toward the core) when the adhesive tape is wound around the core.

[0011] However, according to the studies of the present inventors, the method for manufacturing a dust removal roll having a configuration in which a plurality of continuous cutting lines are formed as described above is complicated, difficult, and lacks practicality, and therefore, the development of a simpler and more effective dust removal adhesive roll for removing foreign matter is desired. Furthermore, the manufacturing method in the technology described in Patent Document 2 involves leaving portions on both ends of a long, wide adhesive tape where no continuous cutting lines are formed, and cutting off both ends after the tape is formed into a roll, which poses a serious problem from the viewpoint of resource conservation, in that the cut-off winding core and the wound adhesive tape are wasted.

[0012] Therefore, an object of the present invention is to provide a dust-removing adhesive roll for removing foreign matter, which is suitable for a dust-removal method using a contact-type cleaning machine, for example, in which dust and material debris from the surface of a printed circuit board are adsorbed onto a rubber roller and then transferred to the adhesive surface of an adhesive tape, thereby removing the dust. The dust-removing adhesive roll is an easy-to-use adhesive roll for removing foreign matter, which involves peeling off a portion of a long, strip-like adhesive tape with a pre-cut cutting line. Another object of the present invention is to provide a method for producing a dust-removing adhesive roll for removing foreign matter, which can reliably produce a dust-removing adhesive roll for removing foreign matter with the above-mentioned excellent properties using a simple method that fully takes into consideration the conservation of resources. Another object of the present invention is to provide a dust-removing adhesive roll that is easy to use, has a cutting line that peels off easily, and can be produced with good workability. The present invention is not limited to the case where foreign matter is removed by transferring it to the rubber roller described above. It also has an object to provide a dust-removing adhesive roll that removes dust by directly adsorbing foreign matter on the surface of the object to the adhesive surface of the adhesive tape, depending on the object. [Means for solving the problem]

[0013] The above object can be achieved by the present invention, which provides the following dust-removing adhesive roll for removing foreign matter. [1] A dust-removing adhesive roll, which is configured such that a long strip-shaped adhesive tape having an adhesive surface with an adhesive layer formed on one surface of a substrate is wound around a cylindrical core with the adhesive surface facing outward to form a roll, and a plurality of linear cutting lines are formed across the entire width of the long strip-shaped adhesive tape at different intervals in the longitudinal direction of the strip-shaped adhesive tape, and when used, the long strip-shaped adhesive tape is peeled off starting from the cutting line forming the end of the long strip-shaped adhesive tape on the outermost surface of the roll to the position of the next cutting line, whereby a single strip-shaped adhesive tape cut across the entire width is peeled off from the roll and a new adhesive surface is exposed, and in this state foreign matter adhering to an object can be removed. The linear cutting line formed across the entire width of the long strip-shaped adhesive tape is a straight or wavy line provided in an oblique direction at an angle of 1° to 30°, and a dust-removing adhesive roll for removing foreign matter, characterized in that the positions of the plurality of cutting lines provided in the longitudinal direction of the long strip-shaped adhesive tape are designed so that the length of each strip-shaped adhesive tape gradually increases from the cylindrical core toward the outside, and the length of the overlapping portion of each strip-shaped adhesive tape formed between the start point of the peeling and the end point of the peeling in the state of forming the roll before being peeled off is designed to be 1 mm or more and 20 mm or less for each long strip-shaped adhesive tape peeled off from the roll.

[0014] Preferred embodiments of the above-described dust-removing adhesive roll for removing foreign matter of the present invention are as follows. [2] The dust-removing adhesive roll for removing foreign matter according to the above [1], wherein the linear cutting line formed across the entire width of the strip-shaped adhesive tape is a straight line obliquely arranged at an angle of 3° to 15° and is a bent line bent at a position near one end of the adhesive tape. [3] The dust-removing adhesive roll for removing foreign matter according to [1] or [2] above, wherein the outer diameter of the cylindrical core is 50 mm or more and 200 mm or less, and the thickness of the long strip-shaped adhesive tape is 25 μm or more and 200 μm or less. [4] A dust-removing adhesive roll for removing foreign matter according to any one of [1] to [3] above, which is used in a cleaning machine intended to remove foreign matter adhering to the surface of a printed circuit board, or for removing foreign matter from the surface of a material processed by a press machine, rotary machine, or rewind machine, or for removing foreign matter on a film in a packaging film production facility.

[0015] As another embodiment, the present invention provides the following method for producing a dust-removing adhesive roll. [5] A method for producing a dust-removing adhesive roll for removing foreign matter, comprising: a cylindrical core having an adhesive surface on one side of a substrate, and a long strip-shaped adhesive tape having a plurality of linear cutting lines formed across the entire width at desired intervals in the longitudinal direction, the long strip-shaped adhesive tape being wound around the core with the adhesive surface facing outward to form a roll; and in use, by peeling off the strip-shaped adhesive tape one by one from the roll, starting from the cutting line forming the end of the long strip-shaped adhesive tape on the outermost surface of the roll, up to the next cutting line, new adhesive surfaces are successively exposed, thereby allowing foreign matter adhering to an object to be removed, a cutting line forming step of preparing a long strip-shaped adhesive tape having an adhesive surface on one side of a substrate, and forming a plurality of linear cutting lines across the entire width of the long strip-shaped adhesive tape at different intervals in the length direction of the strip-shaped adhesive tape, The shape of the linear cutting line formed in the cutting line forming step is a straight line or a wavy line provided in an oblique direction at an angle of 1° to 30°, and the positions of the plurality of linear cutting lines formed in the cutting line forming step are adjusted so that, when a cutting line forming an end of the strip-shaped adhesive tape on the outermost surface of the roll is taken as the peeling start point and the position of the next cutting line is taken as the peeling end point when one strip of adhesive tape is peeled off, in all of the strip-shaped adhesive tapes to be peeled off one by one from the roll, in a state where the strip-shaped adhesive tape is wound around the cylindrical winding core before being peeled off, the length of an overlapping portion of the strip-shaped adhesive tape formed from the peeling start point to the peeling end point is 1 mm or more and 20 mm or less; a method for manufacturing a dust-removing adhesive roll, characterized in that the long, strip-shaped adhesive tape obtained in the cutting line forming step, in which the linear cutting lines formed across the entire width are provided at desired intervals in the longitudinal direction, is wound around the cylindrical winding core with the adhesive surface facing outward to form a roll.

[0016] A preferred embodiment of the method for producing the above-mentioned dust-removing adhesive roll of the present invention is as follows. [6] The method for producing a dust-removing adhesive roll according to the above item [5], wherein the linear cutting line formed across the entire width of the strip-shaped adhesive tape is a straight line obliquely formed at an angle of 3° to 15° and is formed into a folded line bent at a position near one end of the adhesive tape. [7] The method for manufacturing a dust-removing adhesive roll according to [5] or [6] above, wherein the outer diameter of the cylindrical core is 50 mm or more and 200 mm or less, and the thickness of the long strip-shaped adhesive tape is 25 μm or more and 200 μm or less. [8] A method for producing a dust-removing adhesive roll for preparing a plurality of rolls each having a long strip of adhesive tape wound around a cylindrical core, the method comprising the step of cutting the wide roll prepared by the method for producing a dust-removing adhesive roll according to any one of [5] to [7] above, together with the core, into a plurality of rolls. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide an adhesive dust removal roll for removing foreign matter, which is easy to use and extremely useful in terms of efficient resource utilization, and which can effectively and stably remove dust, material residue, etc. from the surface of a printed circuit board by transferring it to the adhesive surface and separating it by peeling off a portion of a long, strip-shaped adhesive tape with a pre-marked cutting line. In addition, according to the present invention, it is possible to provide an adhesive dust removal roll for removing foreign matter, which can suppress dust generation caused by the impact caused by steps when peeling off the overlapping portion of the tape, which is a concern when peeling off the tape during use. According to the present invention, it is possible to provide a method for producing an adhesive dust removal roll for removing foreign matter having the above-mentioned excellent properties, by a simple method that fully takes into consideration the viewpoint of resource conservation, and which can be produced without impairing workability. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic diagram illustrating an adhesive tape constituting a dust-removing adhesive roll of the present invention. [Figure 2] 1(b) and 1(c) are schematic diagrams illustrating the state of a first adhesive tape 1, 1' to be peeled off first from the dust removal adhesive roll of the present invention, a second adhesive tape 2, 2' to be peeled off next that is laminated underneath, and a third adhesive tape 3, 3' to be peeled off next that is laminated underneath that, near the cutting line of the roll. The hatched areas in (b) and (c) show the overlapping portions of the tapes when each adhesive tape is in a roll state and is peeled off sequentially during use. [Figure 3A] 1 is a schematic diagram illustrating an example of a cutting line provided on a long strip-shaped adhesive tape, which characterizes the dust removal adhesive roll of the present invention. FIG. [Figure 3B] FIG. 3 is a schematic diagram illustrating another example of a cutting line provided on a long strip-shaped adhesive tape, which characterizes the dust removal adhesive roll of the present invention. [Figure 4]FIG. 1 is a schematic diagram illustrating the method for producing a dust-removing adhesive roll of the present invention, in which a long strip-shaped adhesive tape is provided with a cutting line that characterizes the present invention and wound around a core to produce a dust-removing adhesive roll. [Figure 5A] FIG. 1 is a schematic diagram illustrating a step of cutting a wide dust removal adhesive roll prepared by the method for producing a dust removal adhesive roll of the present invention together with the core into multiple rolls, which is performed when preparing multiple rolls each having a long strip of adhesive tape wound around a cylindrical core. [Figure 5B] FIG. 1 is a schematic diagram illustrating another example of a step of cutting a wide dust removal adhesive roll prepared by the method for producing a dust removal adhesive roll of the present invention together with the core to divide it into multiple rolls, which step is performed when preparing multiple rolls each having a long strip of adhesive tape wound around a cylindrical core. [Figure 6] FIG. 1 is a schematic diagram illustrating an example in which the dust-removing adhesive roll of the present invention is applied to a cleaning machine that removes foreign matter adhering to the surface of a printed circuit board using an adhesive roll via a rubber roller. [Figure 7] FIG. 1 is a schematic diagram illustrating overlapping portions (wasteful portions) of adhesive tape in a roll state that occur near the cutting line of the adhesive tape that is peeled off sequentially and that constitutes a dust-removing adhesive roll in an example of conventional technology. [Figure 8] 8 is a schematic diagram for explaining the difference in overlapping portions of the adhesive tape in a roll state that occurs near the cutting line of the adhesive tape that is sequentially peeled off and that constitutes the dust removal adhesive roll of the prior art shown in FIG. [Figure 9] 1 is a schematic diagram illustrating cutting lines of adhesive tapes that are sequentially peeled off and that constitute a dust-removing adhesive roll according to the prior art. [Figure 10] Figure (a) confirms that a long and wide single-sided adhesive tape can be wound around a core in a better state, and as a result, a dust-removing adhesive roll can be manufactured without any floating or gaps in the laminated state of the adhesive tape, which was slightly observed in Figure (b). DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be described below with reference to preferred embodiments. However, the present invention is not limited to these embodiments. The present inventors have conducted research to solve the technical problems associated with the conventional dust removal adhesive rolls and methods for manufacturing such rolls, and have arrived at the present invention as a result. The present inventors have investigated what needs to be improved in a dust removal adhesive roll, which is formed by winding a long strip-shaped adhesive tape having an adhesive surface on one side of a substrate around a core with the adhesive surface facing outward to form a roll. The present inventors have found that there is room for improvement in a configuration in which, after the adhesive surface of the adhesive tape has been used to remove foreign matter from the surface of an object, a portion of the long adhesive tape wound around the core whose adhesive surface has become contaminated with foreign matter and has reduced adhesive strength is peeled off to expose a new adhesive surface.

[0020] The present inventors first recognized that, because portions of an adhesive tape whose adhesive surface has become soiled with foreign matter and whose adhesive strength has decreased are peeled off and discarded after use, it is necessary to prevent such wasteful disposal as much as possible from the viewpoint of protecting global resources. Furthermore, they recognized that, in order to be able to easily peel off and remove a portion of an adhesive tape whose adhesive strength has decreased due to being soiled with foreign matter without generating peeling debris, it is necessary to provide a continuous cutting line, rather than a discontinuous cutting line such as a perforation, on a long strip of adhesive tape.

[0021] In response to the above, the dust removal roll of the prior art of Patent Document 2 mentioned above proposes providing continuous cutting lines. Specifically, when the adhesive tape is wound around a core, a plurality of continuous cutting lines are arranged to overlap (align) at approximately the same position (see Figure 2 of the accompanying drawings of Patent Document 2), so that the cut portions of the plurality of continuous cutting lines can adhere tightly without protruding vertically from the outer surface (adhesive surface) and without spreading in the winding direction. The present inventors recognized that although providing a plurality of continuous cutting lines allows the adhesive tape to be easily separated by peeling off portions where the adhesive surface has become dirty, there is room for improvement in the length of each adhesive tape to be separated along the continuous cutting lines after use, in the state where the adhesive tape is wound around a core and the plurality of continuous cutting lines are arranged to overlap (align) at approximately the same position.

[0022] By forming a plurality of continuous cutting lines in the same position in the roll, the start positions of peeling will be the same when the adhesive tape is peeled off sequentially, and it is expected that, for example, automation of the operation of peeling off adhesive tapes sequentially can be easily performed. In addition, the adhesive tape with a dirty adhesive surface that is peeled off from the roll, separated, and discarded will be used at the outermost surface of the roll when used, and since there are no overlapping portions of the adhesive tape at that point, none of the discarded adhesive tapes will include any portions with a clean adhesive surface, which is also useful from the perspective of resource conservation.

[0023] However, according to the studies of the present inventors, when an adhesive tape is in a roll state wound around a core, it is complicated and difficult to design and manufacture the individual lengths of adhesive tape to be cut off after use so that the positions of the continuous cutting lines are aligned in a row, and this is a problem that cannot be achieved by a simple method. For example, it is conceivable to achieve this by preparing an adhesive tape of a length sufficient to wrap one circumference around the outer surface of the core, then preparing an adhesive tape of a length equivalent to one circumference to wrap on top of that, and then sequentially preparing adhesive tapes of different lengths, and sequentially winding the prepared adhesive tapes so that the positions of the cutting lines are aligned, but this is not easy. Furthermore, the thickness of the adhesive tape of a dust-removing adhesive roll, which is the optimal application of the present invention, is extremely thin, for example, about 25 μm to 200 μm, and is used to remove dust from the surface of a printed circuit board by adsorbing dust, material residue, etc. on a rubber roller or the like and transferring the adsorbed dust, material residue, etc. to an adhesive tape. Therefore, the difference in the lengths of the individual adhesive tapes sequentially wound toward the outer periphery of the core is slight, and therefore precision is required in design and manufacturing. As a result of the above, there is also the problem that it is more difficult to design and manufacture the product so that the positions of the continuous cutting lines are aligned in the same row.

[0024] Furthermore, the method described in Patent Document 2, in which a plurality of cutting lines are provided on both ends of a long strip-shaped adhesive tape so as to leave portions where no cutting lines are to be formed, the long strip-shaped adhesive tape is wound around a core to form a roll, and then both ends where no cutting lines are provided are cut off in this state, is a complicated process, and above all, the cut-off ends of the core and the long strip-shaped adhesive tape are wasted, which poses a major problem in terms of effective utilization of resources.

[0025] In addition to the above-mentioned problems, the present inventors have found that the cutting line that serves as the starting point for peeling when peeling off a portion of an adhesive tape that has become contaminated with foreign matter and has reduced adhesive strength also has the following problem. As shown in FIG. 1 attached to the above-mentioned Patent Document 2, conventional cutting lines are provided across both ends of the adhesive tape and are provided as horizontal lines that intersect at right angles to both ends. According to the inventors' investigations, when peeling off a piece of soiled adhesive tape after use, if the cutting line that forms the end is a horizontal line that intersects at right angles to both ends of the adhesive tape as shown in FIG. 9, the adhesive tape must be peeled off starting from the corner that intersects at right angles, which presents a problem of difficulty in peeling. In particular, when the adhesive tape is extremely thin, having a thickness of the order of microns as mentioned above, the problem of difficulty in peeling is even greater. Furthermore, according to detailed studies by the present inventors, in the case of cutting lines that are perpendicular to both ends of the adhesive tape, there is a particular problem in that when the overlapping portion of the adhesive tape is peeled away from the adherend, the shock caused by the step may cause dust to be generated, which may have an adverse effect on precision equipment.

[0026] In response to the above-mentioned problems, the inventors have found that a dust removal adhesive roll having the configuration described below can provide a useful dust removal roll that has not been available before, and have arrived at the present invention. According to the dust removal adhesive roll of the present invention, multiple unique cutting lines are provided at different intervals along the length of the long adhesive tape, allowing adhesive tapes having dirty adhesive surfaces to be smoothly peeled off one by one to sequentially expose new adhesive surfaces. Therefore, for example, foreign matter such as dust and material residue can be transferred to the adhesive surface of the adhesive tape and effectively and stably removed from the surface of a printed circuit board, thereby providing a useful dust removal adhesive roll. The configuration of the dust removal adhesive roll of the present invention is described below.

[0027] The dust-removing adhesive roll of the present invention is formed by winding a long strip-shaped adhesive tape having an adhesive surface with an adhesive layer formed on one side of a substrate around a cylindrical core with the adhesive surface facing outward to form a roll. The substrate and the adhesive layer forming the adhesive surface can be easily manufactured using materials similar to those used in conventional techniques. For example, the substrate can be a film made of a material such as polypropylene or polyester. Toray Industries, Inc. (Toray Industries, Inc.) is a polypropylene film that exhibits high tensile strength in both the longitudinal and transverse directions due to biaxial stretching, which is suitable for suppressing elongation of the substrate. Furthermore, acrylic adhesives, etc., used in conventional techniques can be used as appropriate to form the adhesive layer. A preferred embodiment involves laminating a release agent layer on the adhesive layer.

[0028] The thickness of the substrate and the thickness of the adhesive layer are not particularly limited and may be determined appropriately depending on the application. For example, when foreign matter is removed from the surface of a printed circuit board by adsorbing it onto a rubber roll, the foreign matter adsorbed onto the rubber roll is transferred to an adhesive surface formed on one side of the substrate of an adhesive tape constituting a dust-removing adhesive roll, and the adhesive tape is peeled off from the dirty adhesive surface, an adhesive tape having a thickness of 25 μm to 200 μm is preferably used. More preferably, an adhesive tape having a thickness of 25 μm to 100 μm is used. The thickness of the adhesive layer varies depending on the type of foreign matter to be removed and the thickness of the substrate, but examples include an adhesive layer having a thickness of 10 μm to 50 μm, or an adhesive layer having a thickness of 10 μm to 30 μm.

[0029] The dust removal adhesive roll of the present invention is formed by winding a conventionally known long strip-shaped adhesive tape made of the above-mentioned material around a cylindrical core, with the adhesive surface, which has an adhesive layer formed on one side of the substrate, facing outward to form a roll. The core around which the adhesive tape is wound is cylindrical so that it can be inserted into a rotating shaft during use to rotate the roll. The material and size of the cylindrical core are not particularly limited. However, since the adhesive tape is used by peeling off each sheet one by one to expose a new adhesive surface, the core is preferably configured so that, when wound, the adhesive surface of the adhesive tape is sufficiently large to transfer foreign matter. The length of the cylindrical core is also dependent on the size of the object to be dusted. For example, if the object is a typical printed circuit board, a plastic cylindrical tube, such as a polyester tube, with an outer diameter of 3.3 inches (8.4 cm) and a wall thickness of approximately 3 mm can be used. The length of the cylindrical tube is not particularly limited and can be determined appropriately depending on the width of the adhesive tape of the dust removal adhesive roll to be formed. In addition, production efficiency can also be improved by using a long circular tube, winding a long, wide strip of adhesive tape around the surface of the circular tube to form a roll, and then cutting and dividing the roll as shown in Figures 5A and 5B to form dust removal adhesive rolls of the desired appropriate width.

[0030] The dust removal adhesive roll of the present invention is characterized in that it is formed by winding a long strip-shaped adhesive tape, the long strip-shaped adhesive tape having an adhesive surface with an adhesive layer formed on one surface of a substrate, around a cylindrical winding core as described above, with the adhesive surface facing outward, to form a roll, and that a plurality of linear cutting lines are formed across the entire width of the long strip-shaped adhesive tape at different intervals in the longitudinal direction of the strip-shaped adhesive tape, and that the positions of the plurality of linear cutting lines in the longitudinal direction of the long strip-shaped adhesive tape are configured as follows: Specifically, the positions of the plurality of cutting lines in the longitudinal direction of the long strip-shaped adhesive tape are designed so that the lengths of the strip-shaped adhesive tapes to be sequentially peeled off increase sequentially outward from the cylindrical winding core, and that the length of the overlapping portion of the strip-shaped adhesive tape formed between the start point and the end point of peeling, in the state forming the roll before peeling, is designed to be short so that it is 1 mm or more and 20 mm or less. By shortening the length of the overlapping portion in this way, it is possible to reduce the possibility of dust being generated due to the impact caused by the step when the overlapping portion of the adhesive tape is peeled off from the adherend, as mentioned above.

[0031] In the dust-removing adhesive roll of the present invention, in the overlapping portion of the strip-shaped adhesive tape that is formed between the start point and end point of peeling of a single strip-shaped adhesive tape that is to be peeled off in sequence, which occurs when the roll is being formed before being peeled off, foreign matter is not transferred to the tape located below the overlapping portion, and the tape maintains good adhesiveness, but this portion is also disposed of. For this reason, in addition to reducing the possibility of dust generation as described above, it is preferable that the length of the overlapping portion be as short as possible from the standpoint of effective use of resources.

[0032] On the other hand, as mentioned above, Patent Document 2, a prior art, proposes a configuration in which adhesive tapes used in a wound state around a core have no overlapping portions. In this technology, as shown in Figure 2 of the accompanying drawings, in a rolled state, the cutting line that marks the start point of peeling on the outermost surface of the adhesive tape and the cutting line that marks the end point of peeling are positioned at the same position, and the ends (cut surfaces) of the cutting lines are in contact with each other. Furthermore, the cutting line that marks the end point of peeling and the cutting line that marks the start point of the next peeling are aligned in the same position on a vertical line relative to the surface of the core, and in a single adhesive tape to be peeled, the ends (cut surfaces) of the cutting lines are in contact with each other, and the adhesive tape in this state is wound multiple times. In this way, the dust-removing adhesive roll of the prior art is formed in such a way that the cutting lines that form both ends of the individual adhesive tapes to be peeled one by one after use are in the same position, so that there is no overlapping portion in a single adhesive tape that is peeled off from the roll and discarded. In contrast, as mentioned above, it is complicated and extremely difficult to precisely manufacture the adhesive tape so that the positions of the multiple cutting lines on a vertical line relative to the core surface are as described above. Furthermore, according to the inventors' studies, even if the positions of the ends (cut surfaces) of the cutting lines on a vertical line relative to the core surface can all be made the same, the cut surfaces are not adhered (sticky) to each other. Therefore, if the positions of the ends (cut surfaces) of the cutting lines are all made the same and overlapped (aligned), gaps may be formed at the contact points between the cut surfaces of the cutting lines, or foreign matter may enter the gaps when the roll is rotated to transfer foreign matter to the adhesive surface of the adhesive tape during use. Furthermore, if the cutting lines overlap (align) at the same position, the adhesive surface of the outermost surface of the dust removal adhesive roll will not be good at this overlapping portion. The inventors have found that, due to this, for example, when foreign matter is transferred from the surface of a rubber roller that has adsorbed dust or the like from the surface of an object to the adhesive surface of the adhesive tape constituting the dust removal adhesive roll, the transfer may not be performed stably and satisfactorily, and there is room for improvement.

[0033] As a result of intensive research into the above-mentioned problems, the present inventors have found that the above-mentioned problems can be solved by configuring a long strip of adhesive tape having an adhesive surface on one side of a substrate as follows, which constitutes a dust-removing adhesive roll formed by winding a long strip of adhesive tape around a cylindrical core, in a manner that allows a used sheet of adhesive tape to be easily peeled off from the roll, and peeling off one sheet of adhesive tape exposes a new adhesive surface that can be used for the next transfer of foreign matter. The dust-removing adhesive roll for removing foreign matter of the present invention is characterized in that the positions of the cutting lines provided along the length of the long strip-shaped adhesive tape are designed so that the length of each strip-shaped adhesive tape to be sequentially peeled increases from the cylindrical core to the outside, and that the overlapping portion of each strip-shaped adhesive tape formed between the start point of peeling and the end point of peeling in the use state (i.e., the state in which the roll is formed) in which foreign matter is transferred to the adhesive surface before peeling is short, at 1 mm or more and 20 mm or less, for each long strip-shaped adhesive tape to be sequentially peeled from the roll. According to the inventors' investigations, the overlapping portion may be at least 1 mm, but considering manufacturing stability, it is preferably at least 3 mm, more preferably about 5 mm, and even more preferably about 10 mm. On the other hand, a longer overlapping portion is undesirable because a larger adhesive surface remains in a good adhesive state in the peeled adhesive tape after use, resulting in a larger portion being wasted and discarded. Additionally, to prevent dust from being generated during peeling, it is preferable to minimize the overlapping area, which should be 20 mm or less, preferably 15 mm or less, and even more preferably 10 mm or less.

[0034] The usefulness of the above-described configuration will be explained with reference to the drawings. FIG. 1 is a schematic diagram illustrating the adhesive tape constituting the dust removal adhesive roll of the present invention. As shown on the left side of FIG. 1, the dust removal adhesive roll of the present invention is formed by winding a long strip of adhesive tape around a cylindrical core to form a roll. The long strip of adhesive tape forming the roll has linear cutting lines formed across the entire width of the adhesive tape at different intervals in the longitudinal direction of the long strip of adhesive tape so that a dirty adhesive surface of one tape can be peeled off after use to expose a fresh adhesive surface of the next tape. The right side of FIG. 1 is a schematic diagram showing the difference in length of each adhesive tape when peeled along the multiple linear cutting lines, and the overlapping portions when wound around the cylindrical core are indicated by diagonal lines. The difference in length of each adhesive tape indicates that the adhesive tape is wound sequentially from side A on the surface of the cylindrical core, and therefore the length needs to be gradually increased toward the outer periphery of side B. For ease of understanding, Fig. 1 shows a state in which one adhesive tape has been peeled off and lined up, but the state of the dust removal adhesive roll before peeling is such that a long strip of adhesive tape, on which a plurality of cutting lines are provided at desired intervals, is wound in a series to form an integrated roll, as shown in Fig. 4. Note that the means for providing the cutting lines is omitted from Fig. 4.

[0035] As shown in Figures 2(a), (b), and (c), the overlapping portions of the adhesive tape are formed in a state where, in a single adhesive tape wound around a core, the vicinity of each peel start point 1, 2, and 3 overlaps each peel end point 1', 2', and 3' of the adhesive tape. As shown in Figures 2(b) and (c), the short sections indicated by diagonal lines in the figures are wasted portions that are cut off and discarded after use while still retaining good adhesiveness. Note that in the cross-sectional views of Figures 2(b) and (c), the end faces of the cutting lines are depicted as being separated from each other in order to clarify the position of the cutting lines. However, as will be described later, because the cutting lines are formed with a sharp, thin blade, the end faces of the cutting lines are very close to each other, and the adhesive tape exhibits high integrity despite the presence of the cutting lines, and is essentially the same as a tape formed from a series of strip-like surfaces.

[0036] In contrast to the dust removal adhesive roll of the present invention having the above-described configuration, the comparative example shown in FIGS. 7 and 8 has a configuration in which linear cutting lines formed across the entire width of the adhesive tape are provided at equal intervals in the longitudinal direction of the long strip-shaped adhesive tape. That is, as shown in FIG. 7 , this is an example in which the length of each adhesive tape is made the same when peeled off. This example has the advantage of being easy to design and manufacture, since it is sufficient to provide cutting lines at equal intervals in the longitudinal direction of the long strip-shaped adhesive tape. However, in this case, when a long strip-shaped adhesive tape is peeled off and cut from a wound long strip-shaped adhesive tape, the waste portion that is cut off and discarded while still maintaining good adhesiveness increases toward the core, as shown by the diagonal lines in FIG. 7 , which is a problem in terms of resource conservation. Another problem is that the possibility of dust generation at the overlapping portion during peeling, as mentioned above, increases as the overlapping portion becomes longer.

[0037] Next, the form of the linear cutting lines of the dust removal adhesive roll of the present invention will be described. As described above, the dust removal adhesive roll of the present invention is obtained by winding a long, strip-shaped adhesive tape around a core in a state in which a plurality of linear cutting lines are formed across the entire width of the strip-shaped adhesive tape at specific positions in the longitudinal direction of the tape at desired intervals, and is characterized in that the plurality of linear cutting lines are straight or wavy lines formed in an oblique direction at an angle of 1° to 30°. Furthermore, the angle is preferably 3° to 30°, and more preferably about 3° to 15°. Fig. 3A shows an example of straight cutting lines formed in an oblique direction, and Fig. 3B shows an example of wavy cutting lines formed in an oblique direction. Both are preferred forms of the present invention. The linear cutting lines that characterize the present invention are oblique lines with an angle of 1° to 30°. If the angle is 1° or more, preferably 3° or more, peeling of the adhesive tape from the end of the cutting line as the starting point for peeling is significantly easier than cutting lines perpendicular to the side edges of the adhesive tape. On the other hand, according to the inventors' studies, if the inclination (angle) of the linear cutting lines is greater than 30°, the effect of ease of peeling can be obtained, but the length of the cutting lines formed increases, resulting in poor workability when forming the cutting lines. According to the inventors' studies, when considering the balance between ease of peeling and workability, it is preferable that the multiple linear cutting lines be straight or wavy lines arranged in an oblique direction with an angle of about 3° to 15°. In addition, according to the inventors' research, by making the linear cutting line oblique at an angle of 1° to 30°, preferably 3° to 15°, it is possible to obtain the effect of suppressing the possibility of dust generation caused by the impact of the step that occurs at the overlapping parts when peeling off as mentioned above.

[0038]

[0033] Furthermore, as for the linear cutting lines provided on the dust removal adhesive roll of the present invention, for example, as shown in Fig. 5B, a linear cutting line formed across the entire width of the strip-shaped adhesive tape is a straight line formed in an oblique direction at an angle of 3° to 15° and is a folded line bent at a position near one side edge of the adhesive tape. Fig. 5B shows a manufacturing method for obtaining a plurality of dust removal adhesive rolls of the present invention having the folded cutting lines configured as above. In the manufacturing method for the dust removal adhesive roll of the present invention, a roll is produced by winding a long strip-shaped adhesive tape, on a core, with a plurality of linear cutting lines formed across the entire width of the strip-shaped adhesive tape at desired positions in the longitudinal direction of the tape at appropriate intervals. In this process, a wide dust removal adhesive roll such as that shown in Fig. 5B(a) is produced. Specifically, when providing a plurality of linear cutting lines in the manufacturing process of the dust removal adhesive roll, a plurality of cutting lines (two sets in the example of FIG. 5B(a)) are provided, each of which is linear and obliquely oriented at an angle of 3° to 15°, and which can be configured to form a folded portion bent at a position near one side edge of the adhesive tape. Next, as shown in FIG. 5B(b), one roll manufactured as described above is divided by cutting the roll together with the core and the adhesive tape wound around the core at the end of the folded portion of the cutting line. In this manner, two narrow roll products can be efficiently manufactured. By providing the cutting lines as oblique linear cutting lines with an angle of 1° to 30° in the various forms described above, the dust removal adhesive roll of the present invention can be obtained, which has a shape such that the end of the cutting line, which serves as the starting point for peeling, effectively functions as a peel trigger when peeling off a sheet of adhesive tape after use.

[0039] As described above, a preferred embodiment of the present invention is one in which the linear cutting line is a wavy line obliquely arranged at an angle of 1° to 30°, preferably 3° to 30°, and even more preferably 3° to 15°. FIG. 3B shows an example of a wavy cutting line obliquely arranged. By forming the cutting line constituting the dust removal adhesive roll of the present invention in a wavy line shape, the following effects can be expected, for example, when the adhesive surface of the roll is brought into direct contact with the surface of a printed circuit board to remove foreign matter. When the cutting line is a wavy line, the contact when the dust removal adhesive roll leaves the printed circuit board is point contact rather than line contact, and this is expected to reduce gaps and shocks caused by unevenness in the adhesive tape.

[0040] Next, a method for producing the dust removal adhesive roll of the present invention will be described. As described above, the dust removal adhesive roll of the present invention can be easily produced by the following method using the same materials as those used in the dust removal rolls of the prior art. The production method of the present invention, for example, includes a step of preparing a long strip-shaped adhesive tape having an adhesive surface made of an acrylic adhesive or the like on one side of a substrate made of a polypropylene film, and a step of forming cutting lines to form a plurality of cutting lines across the entire width of the long strip-shaped adhesive tape at different intervals in the longitudinal direction of the strip-shaped adhesive tape, and the positions of the plurality of linear cutting lines formed in the cutting line forming step are such that, when the cutting line forming the end of the strip-shaped adhesive tape on the outermost surface of the roll is taken as the peeling start point and the position of the next cutting line is taken as the peeling end point when one sheet of strip-shaped adhesive tape is peeled off, the length of the overlapping portion of the strip-shaped adhesive tape formed between the peeling start point and the peeling end point is 1 mm or more and 20 mm or less in the state of the roll before peeling in which the strip-shaped adhesive tape is wound around a cylindrical core. Furthermore, the method for manufacturing a dust-removing adhesive roll of the present invention is characterized in that the long, strip-shaped adhesive tape obtained in the cutting line forming step, having a plurality of linear cutting lines formed across its entire width and spaced at desired intervals in the longitudinal direction, is wound around the cylindrical winding core with the adhesive surface facing outward to form a roll.

[0041] The process of forming multiple cutting lines at different intervals along the length of the strip-shaped adhesive tape, which characterizes the present invention, does not require the process of forming continuous linear cutting lines (continuous cutting lines) in a wide raw adhesive tape that extend across the center in the width direction while leaving sections (uncut sections) at a predetermined distance from each end, as is done in the dust removal roll manufacturing method described in the above-mentioned Patent Document 2, thereby simplifying the manufacturing process. Furthermore, not only is the process of cutting off the uncut sections at both ends unnecessary, but the problem of large amounts of rolls remaining at both ends without the cut-off cutting lines is also avoided.

[0042] In the step of forming cutting lines in the production method of the present invention, it is necessary to provide a plurality of cutting lines formed across the entire width of the long strip-shaped adhesive tape at different intervals in the length direction, as shown in Fig. 4. With regard to providing cutting lines at different intervals in the length direction of the long strip-shaped adhesive tape, as described above, it is necessary to design the adhesive tape wound around a core and successively overlapped on the outer periphery of the core so that a single strip-shaped adhesive tape peeled from the roll after use has an overlapping portion as defined in the present invention. As a method for forming cutting lines across the entire width of a long strip-shaped adhesive tape, for example, the following methods can be appropriately used.

[0043] The cutting line characterizing the dust removal adhesive roll of the present invention must be configured such that, after use, the adhesive tape is peeled off starting from the cutting line forming the edge of the outermost surface as the starting point, and then easily separated at the next starting point. As described above, the long strip-shaped adhesive tape constituting the present invention comprises a substrate made of a plastic strip-shaped film (sheet) and an adhesive layer formed on one side thereof. The thickness of the adhesive tape varies depending on its application, but is, for example, 25 μm or more and 200 μm or less. For example, it is conceivable to form a cutting line that leaves a thin portion in the thickness direction so that the adhesive tape can be separated along the cutting line when peeled. However, this method is hardly a simple and reliable means for forming a good cutting line that can reliably separate the adhesive tape along the cutting line.

[0044] The cutting lines that characterize the dust removal adhesive roll of the present invention can be easily formed by using the methods described below. For example, as shown in Fig. 4, from a roll of a long strip-shaped adhesive tape before the formation of cutting lines, the adhesive tape is placed on a conveying means (material) such as a conveyer belt (not shown) and fed toward a cutting device (not shown). After the cutting lines are formed by the cutting device, the adhesive tape with the cutting lines formed thereon is placed on a conveyer belt (not shown) or the like and conveyed to a winding device (not shown). The winding device then continuously winds the tape around a cylindrical core, thereby preparing the dust removal adhesive roll of the present invention. In Fig. 4, the cutting lines are depicted as thick for the sake of explanation, but each strip-shaped adhesive tape cut by forming the cutting lines with a sharp thin blade is sequentially wound around the winding core to form a roll while remaining in a continuous, integrated state. As a result, a dust removal adhesive roll having the configuration of the present invention can be easily formed, in which a plurality of cutting lines are provided at desired intervals along the length of the long strip-shaped adhesive tape. The cutting device used in the present invention can be, for example, a device used for half-cutting, which cuts only the seal or sticker laminated on a release paper while leaving the release paper in place. When half-cutting is performed, the cut cross section is significantly cleaner, and it is possible to form a cutting line in which the cut cross sections are closely spaced. Therefore, as described above, it is possible to maintain high integrity of the long strip-shaped adhesive tape despite being cut. This can be confirmed by observing the portion of the formed dust-removing adhesive roll where the adhesive tape wound around the side core is laminated, and finding that there are almost no gaps that would result from the separation of the cut cross sections. As a blade for forming the cutting line, it is preferable to use a die-cutting roll or the like used in cutting sheet materials such as paper and stickers.

[0045] The cutting lines characterizing the present invention require that, in addition to the specific positions at which the multiple cutting lines are formed, the linear cutting lines formed across the entire width of the strip-shaped adhesive tape be straight or wavy, with an oblique angle of 1° to 30°, as shown in Figures 3A, 3B, 5A, and 5B. It is more preferable that the straight or wavy lines be obliquely formed with an angle of approximately 3° to 15°. This configuration allows the tip of the oblique line to effectively function as a trigger for peeling the adhesive tape. The inventors' studies have confirmed that, compared with horizontal cutting lines as shown in Figure 9, oblique cutting lines are extremely effective as edges to be used when peeling the adhesive tape. Oblique cutting lines can be easily formed using the die-cut roll or the like mentioned above. Furthermore, when forming a cutting line, devices such as die-cut rolls can freely change the angle of the diagonal cutting line, and in addition, by simply stopping or slowing down the die-cut roll for a desired time, it is possible to form a clean diagonal cutting line at a desired angle at a desired position along the length of a long, strip-shaped adhesive tape.

[0046] FIG. 6 is a schematic diagram illustrating an example of the use of the dust-removing adhesive roll of the present invention. The example shown in FIG. 6 illustrates a method for simultaneously removing foreign matter adhering to the front and back surfaces of a printed circuit board. As shown in FIG. 6, first, the suction surfaces of a pair of rubber rollers are placed against the front and back surfaces of the printed circuit board and rotated to adsorb foreign matter, such as dust, from the front and back surfaces of the printed circuit board. A pair of clean rolls (trade name, manufactured by Rayon Co., Ltd.) was used as the rubber rollers. The dust-removing adhesive roll of the present invention is placed in contact with the suction surfaces of the pair of clean rolls and rotated in this state, thereby transferring the foreign matter adsorbed to the suction surfaces of the clean rolls to the adhesive surface of the dust-removing adhesive roll of the present invention. After transfer, one piece of adhesive tape whose adhesive surface has been soiled by the transfer of foreign matter from the dust-removing adhesive roll of the present invention is peeled off and discarded, thereby stably removing foreign matter, such as dust, from the front and back surfaces of the printed circuit board. The peeled adhesive tape has a portion of its adhesive surface that is not transferred with foreign matter, measuring 1 mm to 20 mm, resulting in minimal waste. It was also confirmed that peeling off a single piece of adhesive tape with a dirty adhesive surface was easier than with conventional products.

[0047] While the above-mentioned use example illustrates the removal of foreign matter from the surface of an object such as a printed circuit board via a rubber roll, the dust-removing adhesive roll of the present invention can also be used to remove foreign matter directly from the surface of an object without using a rubber roll, thereby broadening its application. Specifically, the dust-removing adhesive roll of the present invention is suitable for removing foreign matter from the surface of a material processed by a processing machine such as a press machine, a rotary processing machine, or a rewinding processing machine, or for removing foreign matter from a film in a packaging film production facility. More specific use examples of the dust-removing adhesive roll of the present invention include the following. For example, in the context of printed circuit boards, the roll can be used to remove foreign matter after slit formation at a copper foil manufacturer, before the exposure process and before the lamination process at a printed circuit board manufacturer, or before solder printing of electronic components in an SMT process (surface mounting process). Furthermore, the roll can be used to remove foreign matter from films before coating, printing, or bonding in various film manufacturing processes.

[0048] In use, the operation of peeling off one strip of adhesive tape from the roll by starting from the cutting line forming the end of the long strip of adhesive tape on the outermost surface of the dust removal adhesive roll of the present invention and cutting across the entire width to the position of the next cutting line may be performed manually or automatically, but in either case, the end of the oblique cutting line that serves as the starting point for peeling has a shape that effectively functions as a peeling trigger, making it possible to peel off one strip of adhesive tape from the roll more quickly than with conventional rolls. Therefore, the application of the dust removal adhesive roll of the present invention is particularly useful in industrial applications, as it enables stable, smooth, and rapid automatic operation when automatically exposing new adhesive surfaces of the adhesive tape in sequence to continuously remove dust from the surface of an object. [Example]

[0049] The present invention will be described in detail below with reference to examples of the present invention. [Examples 1 to 7, Comparative Examples 1 to 3] A polyester cylindrical tube with an outer diameter of 3.3 inches (84 mm), a wall thickness of 3.5 mm, and a length of 1320 mm was prepared as a cylindrical core. A long, wide polypropylene film with a width of 1300 mm, a length of 2000 m, and a thickness of 60 μm was prepared as a raw substrate. More specifically, a long, wide film of Torayfan (trade name, manufactured by Toray Industries, Inc.) was used, which had been biaxially stretched to exhibit high tensile strength in both the longitudinal and transverse directions (i.e., capable of suppressing expansion and contraction of the substrate). An acrylic adhesive was then applied to one side of this substrate to a thickness of 10 μm to form an adhesive surface, thereby obtaining a raw substrate for a long, wide single-sided adhesive tape. The obtained long, wide single-sided adhesive tape was wound into a 25 m roll. Next, 25 m of the rolled single-sided adhesive tape was unwound as shown in Figure 4, and cutting lines were sequentially made across the entire width of the single-sided adhesive tape using a cutting machine (not shown) at positions where the desired length had been unwound, and the single-sided adhesive tape with multiple cutting lines made was wound into a roll around a prepared core having a length of 1,320 mm. Next, the obtained wide roll was cut into two pieces together with the core, dividing it into two rolls with a width of 650 mm, to produce dust-removing adhesive rolls. When cutting into two, 10 mm was cut off from each end of the roll before cutting to align the end faces of the rolls.

[0050] In the above, a blade similar to that used in die-cut rolls used in cutting sheet materials such as paper and stickers was used as the blade for forming the cutting lines in the cutter to form cutting lines across the entire width of the single-sided adhesive tape. As a result, it was possible to consistently form clean, accurate diagonal cutting lines at the desired positions and angles. Furthermore, as shown in Figure 4, it was confirmed that the single-sided adhesive tape on the conveyor belt with multiple cutting lines formed thereon could be wound integrally around a prepared core to form a roll.

[0051] Using the above-mentioned manufacturing method, dust removal adhesive rolls of Examples 1 to 7 and Comparative Examples 1 to 3 were each produced so that the overlapping portions of the adhesive tape and the shapes of the multiple cutting lines satisfied the conditions shown in Table 1. Then, using each of the obtained dust removal adhesive rolls, a test was conducted in which foreign matter on an object simulating a printed circuit board was transferred to the adhesive tape of each dust removal adhesive roll and removed in the manner shown in FIG. 6, and after removal, the contaminated adhesive tape was peeled off to expose a new adhesive surface, thereby evaluating each dust removal adhesive roll. During the test, the operating conditions for removing foreign matter with the adhesive tape of each dust removal adhesive roll were the same. The evaluations were performed as follows.

[0052] (Wasteful part) After removing the foreign matter with the adhesive tape from each dust-removing adhesive roll, the unsoiled area of ​​each peeled adhesive tape was measured, and the unsoiled area was designated as "waste area" and evaluated according to the following criteria. The results are shown in Table 1. ◎: 5mm or less ○: Over 5mm and 10mm or less △: Over 10mm and 20mm or less ×: Over 20mm

[0053] (Easy to remove adhesive tape at start) After removing foreign matter with the adhesive tape from each dust removal adhesive roll, a single contaminated adhesive tape was peeled off under the same conditions. The "ease of peeling" was evaluated by measuring the time from the start of the peeling operation to the time when peeling of the adhesive tape actually began. Specifically, the operation of removing foreign matter from the surface of the target object with the adhesive tape from each dust removal adhesive roll was repeated 10 times, with each adhesive tape being peeled off one by one to expose a new adhesive surface. Each time, the time from the start of the peeling operation to the time when peeling began was measured, and the average value was calculated for evaluation. The evaluation was performed by evaluating the time when the above-mentioned time was shortened compared to when the adhesive tape from the dust removal adhesive roll of Comparative Example 1, in which multiple horizontal cutting lines were used, with a rating of ○. The results are shown in Table 1.

[0054] (Shock from bumps) Using a specimen simulating a printed circuit board with no foreign matter on its surface, the adhesive tape from each dust removal roll was peeled off under the same conditions as in the previous "ease of peeling" test. This procedure was repeated 20 times: peeling off one adhesive tape, then peeling off each tape one by one to expose a new adhesive surface. The 20 peeled tapes were then observed to determine whether dust generation was observed. The results are shown in Table 1. If no dust generation was observed on any of the tapes, the result was rated "absent." If dust generation was observed on at least one tape, the result was rated "present."

[0055] (Ease of removal of one adhesive tape) After removing foreign matter with the adhesive tape from each dust removal adhesive roll, one contaminated piece of adhesive tape was peeled off under the same conditions, and the "ease of removal" was evaluated by measuring the time from start to finish of the peeling. Specifically, the operation of removing foreign matter from the surface of the target object with the adhesive tape from each dust removal adhesive roll was performed sequentially, peeling off each piece of adhesive tape one by one to expose a new adhesive surface, and this was repeated 10 times, and the time required for each was measured and evaluated. The evaluation was performed by comparing the time required for removal with the adhesive tape from the dust removal adhesive roll of Comparative Example 1, which had multiple horizontal cutting lines, and evaluating it according to the following criteria. The results are shown in Table 1. ◎: The time was clearly reduced compared to when the adhesive tape of Comparative Example 1 was used. ○: The time was slightly reduced compared to when the adhesive tape of Comparative Example 1 was used. △: It took a little longer than when the adhesive tape of Comparative Example 1 was used. ×: It took significantly longer than when the adhesive tape of Comparative Example 1 was used.

[0056] TIFF0007812589000002.tif121170

[0057] According to the studies of the present inventors, it is more preferable to form a long and wide single-sided adhesive tape prepared by the same method as described above with a release paper laminated thereon, and to form cutting lines using a half-cut, in which only the long and wide single-sided adhesive tape is cut while the release paper remains. The present inventors have confirmed that by producing a long and wide single-sided adhesive tape using a release paper in this manner, it is possible to wind a long and wide single-sided adhesive tape around a core in a good state without any lifting or gaps. This can be confirmed by the laminated state of the adhesive tape wound around the core on the side surface of the obtained adhesive roll. Specifically, as shown in the enlarged side view of (b) in Figure 10, when an adhesive tape with multiple cutting lines is wound around a core to form an adhesive roll, any lifting or gaps that occur appear as a small number of black dots on the side surface of the adhesive roll, and can be confirmed by this. In contrast, in the dust removal adhesive roll of the present invention produced by the method using the release paper described above, almost no black dots are observed in the area where the adhesive tape is laminated on the side of the adhesive roll, as shown in the enlarged view of the side of Fig. 10(a), and it has been found that a long, wide single-sided adhesive tape can be wound around the core without floating or gaps. The inventors believe that this is because the use of a release paper in production makes it possible to more effectively suppress the elongation and shrinkage of the adhesive tape that occurs when the single-sided adhesive tape is wound around the core.

Claims

1. a roll comprising a long strip-shaped adhesive tape, the long strip-shaped adhesive tape having an adhesive surface with an adhesive layer formed on one surface of a substrate, wound around a cylindrical core with the adhesive surface facing outward, the long strip-shaped adhesive tape having a plurality of linear cutting lines (excluding discontinuous cutting lines) formed across the entire width of the long strip-shaped adhesive tape at different intervals in the longitudinal direction of the strip-shaped adhesive tape, the long strip-shaped adhesive tape being separated from the outermost cutting line of the roll during use, by peeling the long strip-shaped adhesive tape from the outermost cutting line forming the end of the long strip-shaped adhesive tape to the position of the next cutting line, a single strip-shaped adhesive tape separated across the entire width of the roll is peeled off, exposing a new adhesive surface, and foreign matter adhering to an object can be removed in this state; The linear cutting lines (excluding discontinuous cutting lines) formed across the entire width of the long strip-shaped adhesive tape are straight or wavy lines provided in an oblique direction at an angle of 3° to 15°, and a plurality of cutting lines provided in the longitudinal direction of the long strip-shaped adhesive tape are designed to be positioned so that the length of each strip-shaped adhesive tape gradually increases outward from the tubular core, and the length of an overlapping portion of each strip-shaped adhesive tape formed between the start point of peeling and the end point of peeling in the state of forming the roll before being peeled off is designed to be 1 mm or more and 20 mm or less for any of the long strip-shaped adhesive tapes peeled off from the roll.

2. 2. A dust-removing adhesive roll for removing foreign matter as described in claim 1, wherein the linear cutting line (excluding discontinuous cutting lines) formed across the entire width of the strip-shaped adhesive tape is a bent line bent at a position near one end of the adhesive tape.

3. 3. The dust-removing adhesive roll for removing foreign matter according to claim 1 or 2, wherein the outer diameter of the cylindrical core is 50 mm or more and 200 mm or less, and the thickness of the long strip-shaped adhesive tape is 25 μm or more and 200 μm or less.

4. 3. A dust-removing adhesive roll for removing foreign matter as described in claim 1 or 2, which is either for use in a cleaning machine intended to remove foreign matter adhering to the surface of a printed circuit board, or for use in removing foreign matter from the surface of a material processed by a processing machine such as a press machine, a rotary processing machine, or a rewind processing machine, or for use in removing foreign matter from a film in a packaging film production facility.

5. a method for manufacturing a dust-removing adhesive roll for removing foreign matter, the method comprising: a cylindrical core having an adhesive surface formed on one surface of a substrate; and a long strip-shaped adhesive tape having a plurality of linear cutting lines (excluding discontinuous cutting lines) formed across the entire width and spaced at desired intervals in the longitudinal direction, the core being wound around the core with the adhesive surface facing outward to form a roll; and in use, strip-shaped adhesive tape can be peeled off one by one from the roll, starting from the cutting line forming the end of the long strip-shaped adhesive tape on the outermost surface of the roll and extending to the next cutting line, thereby successively exposing new adhesive surfaces and allowing the removal of foreign matter adhering to an object, a cutting line forming step of preparing a long strip-shaped adhesive tape having an adhesive surface provided on one surface of a substrate, and providing a plurality of linear cutting lines (excluding discontinuous cutting lines) formed across the entire width of the long strip-shaped adhesive tape at different intervals in the longitudinal direction of the strip-shaped adhesive tape, The linear cutting lines (excluding discontinuous cutting lines) formed in the cutting line forming step are straight or wavy lines obliquely formed at an angle of 3° to 15°, and the positions of the plurality of linear cutting lines formed in the cutting line forming step are adjusted such that, when a cutting line forming an end of the strip-shaped adhesive tape on the outermost surface of the roll is taken as the peeling start point and the position of the next cutting line is taken as the peeling end point when one strip of adhesive tape is peeled off, in all of the strip-shaped adhesive tapes to be peeled off one by one from the roll, in a state where the strip-shaped adhesive tape is wound around the cylindrical winding core before being peeled off, the length of an overlapping portion of the strip-shaped adhesive tape formed from the peeling start point to the peeling end point is 1 mm or more and 20 mm or less; a method for manufacturing a dust-removing adhesive roll, the method comprising winding the long, strip-shaped adhesive tape, obtained in the cutting line forming step, having a plurality of linear cutting lines (excluding discontinuous cutting lines) formed across the entire width at desired intervals in the longitudinal direction, around the cylindrical winding core with the adhesive surface facing outward to form a roll.

6. 6. The method for manufacturing a dust-removing adhesive roll according to claim 5, wherein the linear cutting lines (excluding discontinuous cutting lines) formed across the entire width of the strip-shaped adhesive tape are formed so as to be bent at a position near one end of the adhesive tape.

7. 7. The method for producing a dust-removing adhesive roll according to claim 5, wherein the outer diameter of the cylindrical core is 50 mm or more and 200 mm or less, and the thickness of the long strip-shaped adhesive tape is 25 μm or more and 200 μm or less.

8. 7. A method for producing a dust-removing adhesive roll for preparing a plurality of rolls each comprising a long strip of adhesive tape wound around a cylindrical core, the method comprising the step of cutting the wide roll prepared by the method for producing a dust-removing adhesive roll according to claim 5 or 6, together with the core, into a plurality of rolls.

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