Masker tape

Abstract

To provide a masker tape which has adequate strength and adhesive force, and thereby can prevent cutting in recover, and can prevent a surface to be cured from being peeled.SOLUTION: A masker tape 1 for curing a surface 100 to be cured includes an upper layer tape 10 having an adhesive layer 12 on its rear face, a lower layer tape 20 having an adhesive layer 22 on its rear face, and a film 30 stuck to the adhesive layer of the upper layer tape. The adhesive force of the adhesive layer of the lower layer tape is smaller than the adhesive force of the adhesive layer of the upper layer tape, the width of the lower layer tape is smaller than the width of the upper layer tape, the one end face of the upper layer tape and the end face of the lower layer tape are substantially flush with each other, and the adhesive layer of the upper layer tape is covered with the lower layer tape and the film without a gap. The masker tape has a two-layer structure, and thereby is hard to be cut when being peeled from the surface to be cured. The width of the lower layer tape is smaller than the width of the upper layer tape, and thereby is easy to be bent when being stuck onto the surface to be cured.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a masking tape that has appropriate strength and adhesive power, and thus can prevent the tape from breaking when being removed and the surface to be protected from peeling off. [Background technology]

[0002] When painting buildings and other structures, the surface to be protected (the surface not to be painted) is covered with a film to prevent the paint from adhering to the surface. Masking tape, which is an adhesive tape with a film already attached along one edge, is known as one type of protective material. For example, Patent Document 1 discloses a masking tape that has a structure in which a film is sandwiched between two layers of tape, with the edges of the film located inside the tape. With this masking tape, when the film is subjected to an external force, the lower layer tape supports the external force on both sides of the edges of the film, resulting in the masking tape being less likely to peel off from the surface being protected. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-67805 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the technology disclosed in Patent Document 1, when the masking tape is peeled off from the surface to be protected and collected after the painting work is completed, there is a risk that the high adhesive strength of the tape may cause the tape to break or part of the surface to be peeled off.

[0005] In consideration of these problems, the present invention aims to provide a masking tape that has appropriate strength and adhesive power, thereby preventing the tape from breaking when being collected and the surface to be protected from peeling off. [Means for solving the problem]

[0006] The masker tape of the present invention is a masker tape for protecting a surface to be protected, and comprises an upper layer tape having an adhesive layer on its back surface, a lower layer tape having an adhesive layer on its back surface, and a film attached to the adhesive layer of the upper layer tape, wherein the adhesive strength of the adhesive layer of the lower layer tape is smaller than the adhesive strength of the adhesive layer of the upper layer tape, the width of the lower layer tape is smaller than the width of the upper layer tape, one end face of the upper layer tape and one end face of the lower layer tape are approximately flush with each other, and the adhesive layer of the upper layer tape is covered without any gaps by the lower layer tape and the film. The masker tape of the present invention is a masker tape for protecting a surface to be protected, and comprises an upper layer tape having an adhesive layer on its back surface, a lower layer tape having an adhesive layer on its back surface, and a film attached to the adhesive layer of the upper layer tape, wherein the adhesive strength of the adhesive layer of the lower layer tape is smaller than the adhesive strength of the adhesive layer of the upper layer tape, the width of the lower layer tape is smaller than the width of the upper layer tape, one end face of the upper layer tape and one end face of the lower layer tape are approximately flush with each other, the adhesive layer of the upper layer tape does not adhere to the surface to be protected, and the adhesive layer of the lower layer tape is attached to the surface to be protected. The substrate of the upper layer tape is preferably a cloth or nonwoven fabric, and the substrate of the lower layer tape is preferably a paper. [Effects of the Invention]

[0007] The masking tape of the present invention has a two-layer structure, making it difficult to tear when peeled off from the surface to be protected. Furthermore, because the width of the lower layer tape is smaller than that of the upper layer tape, it is easy to bend when applied to the surface to be protected, which also makes it difficult to lift off from the surface to be protected. Furthermore, by tightly covering the adhesive layer of the upper layer tape with the lower layer tape and film, the adhesive layer of the upper layer tape does not adhere to the surface to be protected, preventing the surface to be protected from peeling off when peeled off. The above effect can be most pronounced if the substrate of the upper tape is cloth or nonwoven fabric and the substrate of the lower tape is paper. [Brief explanation of the drawings]

[0008] [Figure 1] (a) is a perspective view of the masking tape, and (b) is a longitudinal cross-sectional view along the width direction. [Figure 2] (a) A longitudinal cross-sectional view of the upper tape, lower tape, and film, (b) A longitudinal cross-sectional view of the masker tape, and (c) A longitudinal cross-sectional view showing the masker tape attached to the surface to be protected. [Figure 3] Vertical cross-sections (a) and (b) of the masking tape used in the first test [Figure 4] Photographs (a) to (c) showing the first test and a table (d) showing the test results. [Figure 5] (a) Photograph showing the second test and (b) table showing the test results [Figure 6] Photographs (a) and (b) showing the third test and a table (c) showing the test results. [Figure 7] Vertical cross-sections (a) to (f) of the masking tape used in the fourth test [Figure 8] Photographs (a) and (b) showing the fourth test and a table (c) showing the test results. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the masking tape of the present invention will be described. Masking tape is a material used to protect surfaces. As shown in FIGS. 1 and 2, the masker tape 1 comprises an upper layer tape 10, a lower layer tape 20, and a film 30. The upper layer tape 10 has an adhesive layer 12 on the back surface of a substrate 11. The substrate 11 of the upper layer tape 10 may be made of cloth, nonwoven fabric, paper, resin film, flat yarn, sponge, or a composite of these, but it is preferable to use cloth or nonwoven fabric. The masking tape 1 is wound in a roll shape. A release agent layer may be provided on the surface of the substrate 11 of the upper layer tape 10 to allow smooth unfolding during use.

[0010] The lower layer tape 20 has an adhesive layer 22 on the back surface of a substrate 21. The substrate 21 of the lower layer tape 20 may be made of cloth, nonwoven fabric, paper, resin film, flat yarn, sponge, or a composite of these, but it is preferable to use paper. One end surface 13 of the upper layer tape 10 and one end surface 23 of the lower layer tape 20 are substantially flush with each other, the adhesive strength of the adhesive layer 22 of the lower layer tape 20 is smaller than the adhesive strength of the adhesive layer 12 of the upper layer tape 10, and the width of the lower layer tape 20 is smaller than the width of the upper layer tape 10. When using commercially available products as the upper layer tape 10 and the lower layer tape 20, for example, a combination in which the width of the lower layer tape 20 is 12 mm and the width of the upper layer tape 10 is 16 mm may be used, but is not limited to this. "Approximately flush" means that the end surfaces 13, 23 of the upper layer tape 10 and the lower layer tape 20 are essentially flush, and even if the end surfaces are slightly misaligned, on the order of 0.5 to 1.0 mm, this is considered to be "approximately flush." As shown in FIG. 2( b ), the lower layer tape 20 is attached to the adhesive layer 12 of the upper layer tape 10 .

[0011] The film 30 is attached to the adhesive layer 12 of the upper layer tape 10. For example, if the width of the upper layer tape 10 is 16 mm and the width of the lower layer tape 20 is 12 mm, the film 30 is attached to the remaining 4 mm of the adhesive layer 12 of the upper layer tape 10. When viewed in a longitudinal cross section along the width direction, the adhesive layer 12 of the upper layer tape 10 is tightly covered by the lower layer tape 20 and the film 30. As a result, as shown in Figure 2(c), the adhesive layer 12 of the upper layer tape 10 does not adhere to the surface 100 to be protected, and only the adhesive layer 22 of the lower layer tape 20 adheres to the surface 100 to be protected. "Covered without gaps" means that when the masker tape 1 is applied to the surface 100 to be protected, the adhesive layer 12 of the upper layer tape 10 is covered by the lower layer tape 20 and film 30 to the extent that the adhesive layer 12 of the upper layer tape 10 does not stick to the surface 100 to be protected; even if there is a gap of about 0.5 to 1.0 mm between the lower layer tape 20 and the film 30, it is considered to be "covered without gaps" as long as the adhesive layer 12 of the upper layer tape 10 does not stick to the surface 100 to be protected. [Example]

[0012] Next, the contents of various tests conducted by the inventors of the present invention will be described. [1st test: vulnerable surface curing test] Tests were conducted using five types of masking tape. Specifically, as shown in Figure 3(a), we prepared masker tapes (1) to (4) using commercially available polyethylene cloth tape, nonwoven fabric tape, paper tape, and cloth tape, and a homemade two-layer masker tape (5) using cloth tape with a paper tape attached to the bottom layer, as shown in Figure 3(b). The width of the masker tapes (1) to (4) was 16 mm, and the width of both the top and bottom tapes of masker tape (5) was 16 mm.

[0013] As shown in Figure 4(a), a calcium silicate board (calcium board) was coated with a brittle emulsion paint (EP) as a base, and the masking tapes (1) to (5) above were attached after the EP had sufficiently dried. Note that the portions of the masking tape films (1) to (5) that were not attached to the adhesive layer of the upper tape were removed. Acryl lysine was sprayed onto the surface as shown in Figure 4(b). When the acryl lysine was sufficiently dry, the masking tapes (1) to (5) were peeled off as shown in Figure 4(c).

[0014] As shown in the “Difficulty to cut” column in the table in Figure 4(d), (3) the paper tape is weak because it uses paper as the base material, and when peeling it off from the calcium silicate board, it was pulled by the acrylic lysine and broke. As shown in the column "Difficulty in peeling off EP," masking tapes that use (1) polyethylene cloth, (2) nonwoven fabric, and (4) cloth as the base material had such a high adhesive strength in the adhesive layer that some of the underlying EP peeled off when they were removed. As a result, it was found that the masker tape (5), which has two layers with the lower layer being a paper tape, is suitable for application to fragile surfaces such as EP. The masker tape (5) has a similar structure to the invention of claim 1 in JP 2011-67805 A.

[0015] [Second test: Non-vulnerable surface curing test] Assuming that the aluminum sashes will be protected with masking tape when painting the exterior walls, an exterior wall base was created with the wall body attached to an aluminum square pipe, as shown in Figure 5(a). The masking tapes (1) to (5) above were attached to a square pipe. The film was removed from the masking tapes (1) to (5). The wall was primed with exterior wall paint, then top-coated twice, and once the paint was sufficiently dry, the masking tapes (1) to (5) were peeled off.

[0016] As shown in the "Removal Difficulty" column in the table in Figure 5(b), masking tape (1) had already started to peel off before it was even peeled off, indicating that it had weak adhesive strength. The masking tape (1) had become smudged and the parting line (the boundary between the aluminum sash and the exterior wall paint) became uneven because the exterior wall paint had seeped into the peeled area. As shown in the "Difficulty to tear" column, (3) the paper tape is made of paper as the base material, so it is not very strong, and when peeling it off from the aluminum sash, it was pulled by the exterior wall paint and tore. As a result, it was found that three types of masking tape are suitable for application to non-fragile surfaces such as aluminum sashes: (2) nonwoven fabric, (4) fabric, and (5) two-layered masking tape.

[0017] [Third test: outdoor durability test] Durability was tested when left outdoors for a long period of time. From the results of the first and second tests, it was found that a two-layer masker tape with a paper tape on the bottom layer, as shown in Figure 3(b), was suitable. Therefore, commercially available masker tapes using cloth tape (two types), polyethylene cloth tape, nonwoven fabric tape, and paper tape were purchased, and paper tape was attached to the bottom layer to create two-layer masker tapes (1) to (5) as shown in Figure 3(b). Both the top and bottom layer tapes were 16 mm wide.

[0018] As shown in Figure 6(a), masker tapes (1) to (5) were attached to the ridge of a Galvalume steel sheet (registered trademark) while being bent in two places. Note that the portions of the masker tape films (1) to (5) that were not attached to the adhesive layer of the upper tape were removed. The surface was left outside from April 30th to May 1st, and then a primer coat was applied on May 2nd, the first top coat on May 6th, and the second top coat on May 7th. After the top coats had sufficiently dried, masker tapes (1) to (5) were peeled off as shown in Figure 6(b). Although there was light rain during the period from April 30th to May 7th, it did not get wet enough to affect the performance of masker tapes (1) to (5).

[0019] As shown in the "Ease of bending" and "Difficulty lifting" columns in the table in Figure 6(c), masking tapes (1), (2), and (3) are made of two layers, one made of cloth and paper, and the other made of polyethylene cloth and paper, which makes them thick, making them difficult to bend when applying. They also tended to lift at the bent points, causing the parting lines to bleed. As shown in the "Difficulty to tear" column, masking tapes (1) to (5) have a double structure that increases their strength, so they do not tear when peeled off. As a result, it was found that masker tapes (4) and (5) were superior overall in terms of ease of bending, resistance to lifting, and resistance to tearing. However, masker tape (5) is made of double-layered paper tape, and its strength may decrease rapidly if it gets wet with rain or night dew.

[0020] [4th test: structural modification test] Masking tapes with a double structure, using cloth or nonwoven fabric as the upper layer and paper as the lower layer, were produced by varying the width and attachment position of the lower layer. Specifically, as shown in Figure 7(a), (A) the masker tape has an upper layer of cloth tape 16 mm thick and a lower layer of paper tape 12 mm thick, with one end face of the upper layer tape and one end face of the lower layer tape being approximately flush with each other; as shown in Figure 7(b), (B) the masker tape has an upper layer of cloth tape 16 mm thick and a lower layer of paper tape 6 mm thick, with one end face of the upper layer tape and one end face of the lower layer tape being approximately flush with each other, forming a gap on the other end face of the lower layer tape; as shown in Figure 7(c), (C) the masker tape has an upper layer of cloth tape 16 mm thick and a lower layer of paper tape 10 mm thick, with one end face of the upper layer tape and one end face of the lower layer tape being offset from each other, forming a gap; and as shown in Figure 7(d), (D) the masker tape has an upper layer The masker tapes were fabricated as follows: a 16mm thick cloth tape and an 8mm thick lower paper tape; one end of the upper and lower tape was offset to form a gap, and a gap was also formed on the other end of the lower tape; (E) as shown in Figure 7(e) was fabricated as a masker tape with a 16mm thick upper nonwoven fabric tape and a 12mm thick lower paper tape (adhesive strength 1.28N / 10mm) so that one end of the upper and lower tape were approximately flush with each other; and (F) as shown in Figure 7(f) was fabricated as a masker tape with a 16mm thick upper nonwoven fabric tape and a 12mm thick lower paper tape (adhesive strength 1.35N / 10mm) so that one end of the upper and lower tape were approximately flush with each other. Masker tapes (A), (E), and (F) have the same structure and are claimed as inventions in this application. The film was attached within a 4mm range of the upper tape.

[0021] As shown in Figure 8(a), a fragile emulsion paint (EP) was applied to a calcium silicate board, and after the EP had sufficiently dried, the masking tapes (A) to (F) were attached in a linear pattern. Note that the portions of the masking tape films (A) to (F) that were not attached to the adhesive layer of the upper tape had been removed. Acryl lysine was sprayed on top of it, and when the acryl lysine was sufficiently dry, the masking tapes (A) to (F) were peeled off as shown in Figure 8(b).

[0022] As shown in the "EP peeling resistance" column in the table in Figure 8(c), masker tapes (B), (C), and (D) had a high rate of EP peeling. This is presumably because masker tapes (B), (C), and (D) had gaps, allowing the adhesive layer of the upper cloth tape, which has a stronger adhesive strength than the adhesive layer of the lower paper tape, to stick to the EP.

[0023] The inventors of the present application further conducted a test in which the masking tapes (A) to (F) were attached to a plate while being bent. As shown in the "Ease of bending" column in the table, masker tapes (A), (E), and (F) were easy to bend and apply. As shown in the table in Figure 6(c), in the third test, masker tapes (1) and (2), which used cloth tape on the top layer and paper tape on the bottom layer, were difficult to bend, causing them to lift, but in the fourth test, it is presumed that they were easier to bend because the width of the bottom layer tape was made smaller than that of the top layer tape. As a result, it was found that masker tapes (A), (E), and (F) were overall superior in terms of the resistance to peeling, lifting, tearing, and ease of bending of the EP. This can be attributed to the effect of making the width of the lower layer tape smaller than that of the upper layer tape, making one end face of the upper layer tape roughly flush with one end face of the lower layer tape, and tightly covering the adhesive layer of the upper layer tape with the lower layer tape and film, which prevents the adhesive layer of the upper layer tape from sticking to the surface being cured. [Industrial Applicability]

[0024] The present invention provides a masking tape that has appropriate strength and adhesive power, and can prevent the tape from breaking or the surface to be protected from peeling off when collected, and has industrial applicability. [Explanation of symbols]

[0025] 1 masking tape 10 Upper layer tape 11 Base material 12 Adhesive layer 13 One end face of the upper layer tape 20 Lower Tape 21 Base material 22 Adhesive layer 23 One end face of the lower tape 30 Film 100 Cured surface

Claims

1. In masking tape for curing a surface to be cured, The tape includes an upper layer tape having an adhesive layer on the back surface thereof, a lower layer tape having an adhesive layer on the back surface thereof, and a film attached to the adhesive layer of the upper layer tape, the adhesive strength of the adhesive layer of the lower-layer tape is smaller than the adhesive strength of the adhesive layer of the upper-layer tape; the width of the lower layer tape is smaller than the width of the upper layer tape; one end surface of the upper layer tape and one end surface of the lower layer tape are substantially flush with each other, A masking tape characterized in that the adhesive layer of the upper layer tape is covered with the lower layer tape and the film without any gaps.

2. In masking tape for curing a surface to be cured, The tape includes an upper layer tape having an adhesive layer on the back surface thereof, a lower layer tape having an adhesive layer on the back surface thereof, and a film attached to the adhesive layer of the upper layer tape, the adhesive strength of the adhesive layer of the lower-layer tape is smaller than the adhesive strength of the adhesive layer of the upper-layer tape; the width of the lower layer tape is smaller than the width of the upper layer tape; one end surface of the upper layer tape and one end surface of the lower layer tape are substantially flush with each other, A masking tape characterized in that the adhesive layer of the upper layer tape does not adhere to the surface to be protected, and the adhesive layer of the lower layer tape adheres to the surface to be protected.

3. 3. The masking tape according to claim 1, wherein the substrate of the upper layer tape is a cloth or nonwoven fabric, and the substrate of the lower layer tape is a paper.

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