Adhesive tape

Abstract

To provide a pressure-sensitive adhesive tape that suppresses breakage of the tape at a perforation when the perforation is formed in the production process, and that is easily separated at the perforation when a user uses the tape.SOLUTION: A pressure-sensitive adhesive tape includes a perforation 4 that includes: a plurality of divided portions 41 in one of which a one side region and another side region are divided in a longitudinal direction of the pressure-sensitive adhesive tape 1; a connecting portion 42 which is positioned between the divided portions 41 and 41 adjacent to each other in a width direction of the pressure-sensitive adhesive tape 1, and connects the one side region and the other side region in the longitudinal direction of the pressure-sensitive adhesive tape 1; and a weak connecting portion 43 which connects the one side region and the other side region in the longitudinal direction of the pressure-sensitive adhesive tape 1, and has a smaller breaking strength than that of the connecting portion 42. The adhesive tape has at least one pair in which the connecting portion 42 and the weak connecting portion 43 are adjacent in the width direction of the pressure-sensitive adhesive tape 1.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an adhesive tape that can remove dust and the like from the surface of an object to be cleaned, for example, by being brought into contact with the object to be cleaned. [Background technology]

[0002] The adhesive tape may be formed into a roll by being wound and laminated in the longitudinal direction, and by rolling the roll over the surface of an object to be cleaned, such as a floor, dust and the like on the surface of the object to be cleaned is adhered to the adhesive layer exposed on the outer circumferential surface of the roll, thereby removing the dust and the like from the surface of the object to be cleaned.

[0003] The adhesive tape has a perforation connecting one end edge and the other end edge in the width direction. This perforation allows adjacent one side region and the other side region in the longitudinal direction of the adhesive tape to be separated. Therefore, by unwinding the adhesive tape from the roll and cutting it at the perforation, it is possible to remove the adhesive tape that has become covered with dust and has weakened its adhesiveness. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3272710 (Figure 1) Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when perforating an adhesive tape in the manufacturing process, conventionally, the adhesive tape is wound into a roll, and then cut in the radial direction at once using a cutting blade. However, with this method of perforating, the perforations are located at one point in the circumferential direction, so dust easily gets into the inside of the roll and becomes dirty. In addition, a cross-sectional shape that was almost a perfect circle is bent into an almost V-shape at the perforation over time, and this bend changes to face the radially outward side, changing into an irregular shape with bent parts, such as a droplet shape, and it becomes difficult to roll smoothly over the surface of the object to be cleaned. In addition, since the perforations are located at the same position on the inner and outer layers, for example, a user may accidentally peel off two pieces of adhesive tape, making it difficult to unwind the adhesive tape. These disadvantages exist.

[0006] Therefore, a configuration has been proposed in which perforations are formed at different positions on the inner and outer layers of a roll-shaped body, as in Patent Document 1. This configuration has eliminated the above-mentioned disadvantages. However, with this configuration, it is not possible to provide perforations at one location in the circumferential direction, so it is necessary to form perforations in the adhesive tape before it is wound into a roll-shaped body.

[0007] In other words, since the adhesive tape is wound up by a machine while perforations are made in the adhesive tape, which is in the form of a single sheet, if there are few joints at the perforations (portions where the adhesive tape is connected in the longitudinal direction between the slits of the perforations), the adhesive tape is likely to break during winding. If the adhesive tape breaks, winding by the machine must be stopped, which reduces the efficiency of manufacturing the roll. This problem occurs more noticeably depending on the material of the adhesive tape base material (for example, when recycled paper, which has a relatively low breaking strength, is used). On the other hand, when the user is using the tape, it is easier to separate it at the perforations if there are fewer joints. Thus, contradictory circumstances exist.

[0008] In view of the above circumstances, an object of the present invention is to provide an adhesive tape that is prevented from breaking at the perforations when the perforations are formed during the manufacturing process, while at the same time allowing the user to easily tear the tape at the perforations when in use. [Means for solving the problem]

[0009] The present invention relates to an adhesive tape that is a strip-shaped body having an adhesive layer on one side surface and has perforations connecting one end edge and the other end edge in the width direction, and that can separate adjacent one side region and the other side region in the longitudinal direction at the perforations, the perforations having a plurality of separating portions where the one side region and the other side region are separated in the longitudinal direction of the adhesive tape, connection portions located between adjacent separating portions in the width direction of the adhesive tape and connecting the one side region and the other side region in the longitudinal direction of the adhesive tape, and weak connection portions located in portions between adjacent separating portions in the width direction of the adhesive tape where no connection portions are provided, connecting the one side region and the other side region in the longitudinal direction of the adhesive tape, and having a breaking strength lower than that of the connection portions, and the adhesive tape has at least one pair of the connection portions and the weak connection portions adjacent to each other in the width direction of the adhesive tape.

[0010] According to this configuration, by providing the weak connection portion, it is possible to achieve both ease of separation when using the adhesive tape and resistance to breakage during manufacturing.

[0011] The adhesive tape may further include at least one pair of the connection portions arranged in the width direction of the adhesive tape such that the two connection portions sandwich at least one of the weak connection portions.

[0012] According to this configuration, two connection parts are located on both sides of at least one weak connection part, so that it is possible to achieve a balance in terms of strength.

[0013] The weak connection portion may be formed by a half cut in which the adhesive tape is severed partway in the thickness direction.

[0014] According to this configuration, the weak connection can be easily formed by using a half cut, which is a known method.

[0015] In addition, the strip is wound in the longitudinal direction and stacked to form a roll, and the perforations can be offset in the circumferential direction between the radially outer layer and the radially inner layer.

[0016] With this configuration, separation at each perforation is easier than in a structure in which the perforations are aligned circumferentially, and the cross-sectional shape of the roll-shaped body can be prevented from collapsing from an approximately perfect circle.

[0017] The connection portion may have a dimension of 0.1 to 6.0 mm in the width direction of the adhesive tape.

[0018] According to this configuration, if the connection portion is within this dimensional range, the effect of providing the weak connection portion can be significantly obtained.

[0019] The weak connection may have a dimension of 0.1 to 6.0 mm in the width direction of the adhesive tape.

[0020] According to this configuration, if the weak connection portion is within this dimensional range, the effect of providing the weak connection portion in combination with the connecting portion can be significantly obtained.

[0021] The connection portions and the weak connection portions may be provided at 3 to 24 locations in total in the width direction, and among these, the number of the weak connection portions may be 1 to 8 locations.

[0022] This configuration achieves optimal conditions for both ease of separation during use of the adhesive tape and resistance to tearing during manufacture.

[0023] The pressure-sensitive adhesive layer may be formed on a substrate, and the substrate may be made of recycled paper.

[0024] With this configuration, even if recycled paper is weaker than new paper, the adhesive tape can be easily separated when in use and is not easily broken during manufacture.

[0025] The strip may be wound in the longitudinal direction and stacked to form a roll, and may be provided with markers for finding the perforations.

[0026] This configuration makes it easy to find the perforation for separating one side region from the other side region.

[0027] In addition, the strip is wound longitudinally and stacked to form a roll, and when the one side region is separated from the other side region, reinforcing tape can be attached along the perforation at the longitudinal end of the other side region.

[0028] With this configuration, the reinforcing tape provides stiffness, making it easier to separate at the perforations.

[0029] The strip is wound around a core in the longitudinal direction and stacked to form a roll, and the ratio of the inner diameter of the core to the outer diameter of the roll can be 1.5 or more.

[0030] According to this configuration, even a roll-shaped body having a large diameter can be formed.

[0031] The present invention also relates to an adhesive tape which is a strip-shaped body having an adhesive layer on one side and having perforations connecting one edge and the other edge in the width direction, which allows the one side region and the other side region which are adjacent in the longitudinal direction to be separated by the perforations, and which has a breaking strength of more than 15.0 N and less than 60.6 N per 160 mm width dimension at the portion where the perforations are provided.

[0032] According to this configuration, by setting the breaking strength in the portion where the perforations are provided within this range, it is possible to both prevent the material from breaking at the perforations and make it easy for the user to separate the material at the perforations when using the material. Effect of the Invention

[0033] According to the present invention, when the perforations are formed in the manufacturing process, the risk of the product being torn at the perforations is suppressed, while at the same time, the product can be easily torn apart at the perforations when the product is in use. [Brief description of the drawings]

[0034] [Figure 1] 1 is a perspective view showing a state in which one area of ​​the outermost adhesive tape has been pulled out from a roll of adhesive tape according to one embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a perspective view showing the opposite side of the state shown in FIG. 1. [Diagram 3] 2 is a perspective view showing the roll of adhesive tape (in a state where the outermost adhesive tape has not been pulled out). FIG. [Figure 4] This is an enlarged view from the radial direction, showing the perforation portion of the adhesive tape in the roll form, with the adhesive layer around the connection portion and weak connection portion removed for ease of explanation. [Diagram 5] 5 is a cross-sectional view taken along the line VV in FIG. 4 (wherein the radial direction is highlighted and the adhesive layer is omitted). [Figure 6] 6 is a cross-sectional view taken along line VI-VI of FIG. 4 (wherein the radial direction is highlighted and the adhesive layer is omitted). [Figure 7] 7 is a cross-sectional view taken along the line VII-VII in FIG. 4 (where the radial direction is highlighted and the adhesive layer is omitted). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Next, the present invention will be described by taking up one embodiment. The adhesive tape 1 of this embodiment is a strip-shaped body, has an adhesive layer 3 on one side, has a perforation 4 linearly connecting one end edge and the other end edge in the width direction, and can separate one side region and the other side region adjacent in the longitudinal direction at the perforation 4. This adhesive tape 1 is formed by coating the adhesive layer 3 on a sheet-shaped substrate 2. In this embodiment, the substrate 2 is made of recycled paper. Note that, when the thickness is the same, recycled paper tends to have a smaller breaking strength than new paper (paper newly made from pulp). In the width direction of the adhesive tape 1, the adhesive layer 3 is formed narrower than the substrate 2. In other words, the adhesive layer 3 is not formed on both ends in the width direction of the adhesive tape 1.

[0036] In this embodiment, the adhesive tape 1, which is a strip, is wound around the core 5 in the longitudinal direction and laminated to form a roll 1R, as shown in Figs. 1 to 3. The ratio of the outer diameter of the roll 1R to the inner diameter of the core 5 can be 1.5 or more. In this embodiment, it is about 1.8. However, there is no problem if the ratio is less than 1.5. Here, if the ratio is 1.5 or more, the diameter at the start of winding (the diameter is approximately equal to the outer diameter of the core 5) and the diameter at the end of winding (the diameter of the roll 1R itself) will be significantly different, so that it is necessary to pay attention to the tension control of the adhesive tape 1 when manufacturing the roll 1R.

[0037] Here, the roll-shaped body 1R of this embodiment is manufactured by winding up the strip-shaped (one-piece) adhesive tape 1 on which the perforations 4 have been formed in advance. If the ratio of the outer diameter of the roll-shaped body 1R to the inner diameter of the winding core 5 is large, it becomes difficult to control the tension in the longitudinal direction of the strip during manufacturing. Moreover, if the perforations 4 are being formed, it becomes even more difficult to control the tension. Specifically, as described above, if the ratio exceeds 1.5, winding up the adhesive tape 1 tends to be particularly difficult. In relation to this, in this embodiment, the perforations 4 are provided with a combination of a connection portion 42 and a weak connection portion 43 as described later, so that the tensile strength of the adhesive tape 1 in the strip state can be improved, and therefore even if the ratio is large (specifically 1.5 or more), it is easier to wind up the strip-shaped adhesive tape 1 around the winding core 5 to form the roll-shaped body 1R than when other types of perforations are provided. Therefore, even if the roll-shaped body 1R has such a large diameter, it can be formed without any problems.

[0038] The perforation 4 has a separation portion 41, a connection portion 42, and a weak connection portion 43. The separation portion 41 is a portion where one side region and the other side region are separated (not connected) in the longitudinal direction of the adhesive tape 1. In this embodiment, in a set 4A (described later) in which two connection portions 42 sandwich one weak connection portion 43, the separation portion 41 between the connection portions 42 and the weak connection portion 43 has a dimension of 18.5 mm in the width direction of the adhesive tape 1. In addition, the separation portion 41 between two adjacent sets 4A, 4A has a dimension of 40 mm in the width direction of the adhesive tape 1. Note that the dimension of the separation portion 41 is determined by the dimensional settings of the connection portions 42 and the weak connection portions 43, and is not limited to the above-mentioned numerical value.

[0039] The connection portion 42 is located between the adjacent divided portions 41, 41 in the width direction of the adhesive tape 1, and is a portion where one side region and the other side region are connected in the longitudinal direction of the adhesive tape 1. In the connection portion 42, the one side region and the other side region are completely connected without any loss in the thickness direction (see Figs. 5 and 6). The connection portion 42 is formed in a dimension range of 0.1 to 6.0 mm (including both end values) in the width direction of the adhesive tape 1. The dimension range is preferably 0.2 to 4.5 mm, more preferably 0.5 to 3.5 mm. In this embodiment, it is set to 2.0 mm. If the connection portion 42 is within this dimension range, the effect of providing the weak connection portion 43 can be significantly obtained.

[0040] The weak connection portion 43 is a portion located between adjacent divided portions 41, 41 in the width direction of the adhesive tape 1, where no connection portion 42 is provided. The weak connection portion 43 is formed in a dimension range of 0.1 to 6.0 mm (including both ends) in the dimension in the width direction of the adhesive tape 1. The dimension range is preferably 0.2 to 4.5 mm, more preferably 0.5 to 3.5 mm. In this embodiment, it is 3.0 mm. Here, it is the same as the connection portion 42 in that one side region and the other side region are connected in the longitudinal direction of the adhesive tape 1, but has a smaller breaking strength than the connection portion 42. The weak connection portion 43 is formed by half-cutting the adhesive tape 1 to the middle of the radial outer side in the thickness direction (see Figs. 5 and 7). By using a half-cut, which is a known method, the weak connection portion 43 can be easily formed.

[0041] The perforations 4 are formed by pressing a cutting blade (not shown) against the strip-shaped adhesive tape 1 in the thickness direction and cutting it intermittently in the width direction. The cutting blade cuts the base material 2 and the adhesive layer 3 in the entire thickness dimension at the position of the dividing portion 41, does not cut at all at the position of the connecting portion 42, and cuts the base material 2 and the adhesive layer 3 in approximately half the thickness dimension at the position of the weak connecting portion 43 (note that in FIG. 4, no line extending in the width direction of the adhesive tape 1 appears at the connecting portion 42, whereas a line extending in the width direction of the adhesive tape 1 appears at the weak connecting portion 43). In this way, each of the dividing portion 41, the connecting portion 42, and the weak connecting portion 43 is formed. Note that the degree of cutting in the thickness dimension at the weak connecting portion 43 can be set arbitrarily.

[0042] The adhesive tape 1 has at least one set of a connection portion 42 and a weak connection portion 43 adjacent to each other in the width direction of the adhesive tape 1. More specifically, there is at least one set 4A in which two connection portions 42 are arranged in the width direction of the adhesive tape 1 so as to sandwich at least one weak connection portion 43. In this embodiment, when the connection portions 42 are indicated as "connection" and the weak connection portions 43 are indicated as "weak", they are arranged in the width direction as "connection-weak-connection-connection-weak-connection". Thus, as shown in FIG. 4, there are two sets 4A ("connection-weak-connection" sets) arranged in the width direction of the adhesive tape 1 as a set of repeating units, in which two connection portions 42 sandwich one weak connection portion 43. At least one weak connection portion 43 (relatively low breaking strength) is arranged in the width direction of the adhesive tape 1. Small Two connection parts 42 (which have relatively high breaking strength) are provided on both sides of the Large By positioning the joint part in such a manner, it is possible to achieve a balance in terms of strength (specifically, breaking strength).

[0043] The adhesive tape 1 has a total of 3 to 24 connection portions 42 and weak connection portions 43 provided in the width direction. Of these, there are 1 to 8 weak connection portions 43. By setting the quantities of connection portions 42 and weak connection portions 43 to these numerical values, it is possible to achieve optimal conditions that achieve both ease of separation during use of the adhesive tape 1 and resistance to breakage during manufacture. In this embodiment, there are a total of 6 connection portions 42 and weak connection portions 43. Of these, there are 2 weak connection portions 43.

[0044] The breaking strength at the portion where the perforation 4 is provided is more than 15.0 N and less than 60.6 N per 160 mm width. The range of this breaking strength is preferably 20 N or more, more preferably 25 N or more, and preferably 50 N or less, more preferably 40 N or less. The breaking strength is measured, for example, by preparing a specimen of the pressure-sensitive adhesive tape 1, attaching an auxiliary plate made of cardboard or the like in the thickness direction to one side region and the other side region in the longitudinal direction sandwiching the perforation 4, and using a tensile tester with the auxiliary plate portion chucked.

[0045] Here, the results of the breaking strength test conducted by the inventor of the present application will be briefly described. The width dimension of the test piece of the adhesive tape 1 was 160 mm, the tensile speed of the tensile tester was 300 mm / min, and the peak force value when the perforation 4 broke over the entire width of the test piece was measured. The measurement was performed five times for test pieces of the same configuration. As a test piece close to this embodiment, a base material made of recycled paper laminated with polyethylene was used, and the connection parts 42 (2 mm in the width direction of the adhesive tape 1) were formed at four locations and the weak connection parts 43 (2 mm in the width direction of the adhesive tape 1) were formed at two locations. As a result of the test using this test piece, the average breaking strength (unit: N) was 29.1. The individual measured values ​​were 27.7, 30.3, 30.6, 29.6, and 27.3. Furthermore, this test specimen was good in both cuttability (ease of separation) assumed during use and breakability (ease of breaking) assumed during production. The cuttability was evaluated based on human perception. Regarding breakability, a test specimen was evaluated as "good" if the adhesive tape 1 could be wound up without breaking during production of the roll 1R.

[0046] On the other hand, in the first comparative example, the base material was recycled paper laminated with polyethylene, and the connection parts 42 (2 mm in the width direction of the adhesive tape 1) were formed in four places (weak connection parts 43 were not formed), and the average breaking strength was 15.0 N. The individual measured values ​​were 13.2, 14.7, 15.4, 18.2, and 13.7. In this example, the cuttability (ease of separation) assumed during use was good, but the breakability (ease of breaking) assumed during manufacturing was poor (it was easily broken). It is believed that the absence of weak connection parts 43 had an impact.

[0047] In the second comparative example, the base material was made of recycled paper and laminated with polyethylene, and the joints 42 (2 mm in the width direction of the adhesive tape 1) were formed at 16 places (weak joints 43 were not formed), and the average breaking strength was 65.7 N. The individual measured values ​​were 62.6, 55.2, 71.4, 65.6, and 73.5. In the third comparative example, the base material was made of new paper (specifically, pure white paper) and laminated with polyethylene, and the joints 42 (2 mm in the width direction of the adhesive tape 1) were formed at 16 places (weak joints 43 were not formed), and the average breaking strength was 60.6 N. The individual measured values ​​were 55.8, 60.6, 71.0, 49.6, and 66.3. In these examples, the breakability (ease of breaking) assumed during manufacturing was good, but the cutability (ease of separation) assumed during use was difficult (difficult to separate). This is thought to be because the number of connecting parts 42 was large.

[0048] Next, the results of the tear strength test conducted by the inventor of the present application will be briefly described. A test specimen was prepared by cutting the adhesive tape 1 to a width of 50 mm so that the perforation 4 was in the center (i.e., the perforation 4 was in the center in the width direction). One side of the test specimen in the width direction was attached to the upper chuck of a tensile tester across the perforation 4, and the other side in the width direction was attached to the lower chuck of the tensile tester. The tensile speed of the tensile tester was set to 300 mm / min, and the peak force at the time of breakage was measured for each of the connection part 42 and the weak connection part 43. The measurement was performed three times for each test specimen of the same configuration.

[0049] As a specimen close to this embodiment, a substrate made of recycled paper laminated with polyethylene was used, as in the breaking strength test, with four joints 42 (2 mm in the width direction of the adhesive tape 1) and two weak joints 43 (2 mm in the width direction of the adhesive tape 1). As a result of testing this specimen, the average tear strength (unit: N) at joints 42 was 0.8. The individual values ​​measured were all 0.8 for all three times. The average tear strength (unit: N) at weak joints 43 was 0.6. The individual values ​​measured were all 0.6 for all three times.

[0050] By providing the weak connection portion 43 in the perforation 4 in addition to the connection portion 42, the breaking strength can be improved, as is clear from the above-mentioned test results. Moreover, since the weak connection portion 43 is a portion that is partially divided in the thickness direction by half-cutting or the like, the increase in resistance to the user's tearing action can be suppressed more than when the connection portion 42 is increased. Therefore, it is possible to achieve both ease of tearing when using the adhesive tape 1 and resistance to tearing during manufacturing. Regarding resistance to tearing during manufacturing, as described later, in order to form the perforations 4 in the outer layer and the inner layer in the radial direction in the rolled body 1R so as to be shifted in the circumferential direction (FIGS. 6 and 7), it is necessary to partially cut the adhesive tape 1 before winding it into the rolled body 1R to form the perforations 4. In this case, since the perforations 4 are made in the adhesive tape 1, which is a single sheet, the connection portion 42 is pulled by tension in the longitudinal direction, and the adhesive tape 1 may break. If the only consideration is the ease with which the user can separate the adhesive tape 1 during use, it is sufficient to simply reduce the number of connection parts 42. However, doing so would have the disadvantage of making the adhesive tape 1 more susceptible to breaking during production. In this embodiment, by combining the connection parts 42 with the weak connection parts 43, it is possible to improve the resistance to breaking during production while still making the adhesive tape 1 easier to separate during use (while preventing it from becoming more difficult to separate).

[0051] In addition, in this embodiment, the base material 2 is made of recycled paper, but recycled paper can be weaker than new paper. Even in this case, the adhesive tape 1 can be easily separated when in use and is not easily broken during production.

[0052] Furthermore, by providing weak connection portion 43, when a user separates adhesive tape 1 during use, weak connection portion 43 is more likely to break than reinforcing tape 7, which will be described later, so that reinforcing tape 7 is prevented from being torn off along with base material 2, and adhesive tape 1 can be neatly separated at perforation 4.

[0053] In addition, in the roll-shaped body 1R of this embodiment, the perforations 4 are shifted in the circumferential direction between the outer layer and the inner layer in the radial direction (see FIG. 6 for the joint portion 42, and see FIG. 7 for the weak joint portion 43). In this embodiment, the length of one area between the perforations 4, 4 of the adhesive tape 1 is set to be greater than the length of 360° in the circumferential direction of the roll-shaped body 1R at the part where the adhesive tape 1 is wound, and the shift is set so that the outer layer covers the inner layer at the position of the perforation 4. By shifting the perforations 4 in this manner, it is easier to separate at each perforation 4 compared to a structure in which the perforations 4 are aligned in the circumferential direction, and it is possible to suppress the cross-sectional shape of the roll-shaped body 1R from collapsing from an approximately perfect circular shape as in the conventional case. Furthermore, even if the adhesive tape 1 of the outer layer becomes dirty due to adhesion of dust or the like, the adhesive tape 1 of the inner layer is covered by the adhesive tape 1 of the outer layer and is therefore not dirty.

[0054] Moreover, the roll-shaped body 1R of this embodiment includes a mark 6 for finding the perforation 4. This mark 6 makes it easy to find the perforation 4 in order to separate one side region of the adhesive tape 1 from the other side region. The mark 6 can be provided at a position associated with the perforation 4. For example, the mark 6 can be provided along the perforation 4 or so as to overlap the perforation 4. Furthermore, the shape and color of the mark 6 are not particularly limited. The mark 6 can be formed, for example, by printing on the adhesive tape 1. Furthermore, like the reinforcing tape 7 of this embodiment, the mark 6 can be formed by adhering it onto the adhesive tape 1 as an object separate from the adhesive tape 1.

[0055] When one side region of the adhesive tape 1 is to be separated from the other side region, the reinforcing tape 7 is attached along the perforation 4 at the longitudinal end of the other side region. The longitudinal dimension of the reinforcing tape 7 is slightly smaller than the width dimension of the adhesive tape 1. In this embodiment, the width dimension is 3 mm, and the thickness dimension is about 0.6 mm. The dimensions are not limited to these and can be changed in various ways. Since the thickness of the reinforcing tape 7 is increased and stiffness is obtained, the separation at the perforation 4 can be performed along the reinforcing tape 7, making the separation easier. The reinforcing tape 7 is a long and narrow strip extending in the width direction of the adhesive tape 1, and is a different color from the base material 2 and the adhesive layer 3, so that it can also serve as the mark 6. The shape of the periphery of the reinforcing tape 7 may be changed in various ways.

[0056] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit and scope of the present invention.

[0057] For example, the material of the base material 2 in the above embodiment is recycled paper. However, the present invention is not limited to this, and the material may be, for example, virgin paper such as pure white paper, nonwoven fabric, resin film, or sheet-like foam. Furthermore, the surface of each of the above materials may be laminated or subjected to a release treatment (for example, silicone coating).

[0058] In the above embodiment, when the connection portion 42 is indicated as "connected" and the weak connection portion 43 is indicated as "weak", they are arranged in the width direction as connected-weak-connected-connected-weak-connected, and the configuration of one set 4A (a set of repeating units) in which the connection portions 42, 42 sandwich the weak connection portion 43 is "connected-weak-connected". However, the arrangement of the connection portions 42 and the weak connection portions 43 is not limited to this. For example, they may be arranged as "connected-weak-weak-connected", "weak-connected-connected-weak" or "connected-weak-connected-weak".

[0059] In addition, in the roll-shaped body 1R, with regard to the perforations 4-4 being misaligned in the circumferential direction between the radially outer layer and the inner layer, in the above embodiment, the length of one area between the perforations 4, 4 of the adhesive tape 1 is set to be greater than the length of 360° in the circumferential direction of the roll-shaped body 1R at the portion where the adhesive tape 1 is wound, and the misalignment is such that the outer layer covers the inner layer at the position of each perforation 4. However, conversely, the length of one area between the perforations 4, 4 of the adhesive tape 1 can also be set to be smaller than the length of 360° in the circumferential direction of the roll-shaped body 1R at the portion where the adhesive tape 1 is wound, and the misalignment is such that a part of the inner layer is exposed from the outer layer at the position of each perforation 4. [Explanation of symbols]

[0060] 1 adhesive tape 1R roll 2 Base material 3 Adhesive layer 4 Perforations 41 Divided part 42 Connection 43 Weak joint 4A Connections sandwiching weak connections 5 Roll core 6. Landmarks 7 Reinforcement Tape

Claims

1. An adhesive tape that is a strip-shaped body, has an adhesive layer on one side surface, has a perforation connecting one end edge and the other end edge in the width direction, and can separate one side region and the other side region adjacent to each other in the longitudinal direction at the perforation, The perforations include a plurality of dividing portions in which the one side region and the other side region are divided in the longitudinal direction of the adhesive tape; a connection portion located between adjacent divided portions in a width direction of the adhesive tape, the connection portion connecting the one side region and the other side region in a longitudinal direction of the adhesive tape; a weak connection portion located in a portion where the connection portion is not provided between the divided portions adjacent to each other in the width direction of the adhesive tape, connecting the one side region and the other side region in the longitudinal direction of the adhesive tape, and having a breaking strength smaller than that of the connection portion, The adhesive tape has at least one pair of the connection portion and the weak connection portion adjacent to each other in the width direction of the adhesive tape.

2. The adhesive tape according to claim 1 , comprising at least one pair of said connection portions arranged in a width direction of said adhesive tape such that two of said connection portions sandwich at least one of said weak connection portions.

3. The adhesive tape according to claim 1 , wherein the weak connection portion is formed by a half cut in which the adhesive tape is severed halfway in a thickness direction.

4. The strip is wound in a longitudinal direction and stacked to form a roll, The adhesive tape according to any one of claims 1 to 3, wherein the perforations are offset in the circumferential direction between the radially outer layer and the radially inner layer.

5. 5. The adhesive tape according to claim 1, wherein the connection portion has a dimension of 0.1 to 6.0 mm in the width direction of the adhesive tape.

6. 6. The adhesive tape according to claim 1, wherein the weak connection portion has a dimension of 0.1 to 6.0 mm in the width direction of the adhesive tape.

7. The connection portions and the weak connection portions are provided in a total of 3 to 24 locations in the width direction, The pressure-sensitive adhesive tape according to claim 5 or 6, wherein the number of the weak connections is 1 to 8.

8. The adhesive tape according to any one of claims 1 to 7, wherein the adhesive layer is formed on a substrate, and the substrate is made of recycled paper.

9. The strip is wound in a longitudinal direction and stacked to form a roll, The adhesive tape according to any one of claims 1 to 8, further comprising a mark for finding the perforations.

10. The strip is wound in a longitudinal direction and stacked to form a roll, The adhesive tape according to any one of claims 1 to 9, wherein when the one-side region is separated from the other-side region, a reinforcing tape is attached along the perforation at the longitudinal end of the other-side region.

11. The strip is wound around a core in the longitudinal direction and stacked to form a roll, The pressure-sensitive adhesive tape according to any one of claims 1 to 10, wherein the ratio of the outer diameter of the roll to the inner diameter of the core is 1.5 or more.

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