Protective tape for wire harness

Abstract

Provided is a wire harness protective tape having excellent tape winding workability, suppression of tape end peeling, and wear resistance. A wire harness protective tape (10) is provided with: a base material (102) that contains a thermoplastic resin and has a thickness of 120 [mu] m to 190 [mu] m, a 10% modulus (N / 19 mm width) of 12.5 to 18.5, and an unwinding adhesive force (N / 19 mm width) of 0.8 to 4.5; and an adhesive layer (104) that is formed on the base material (102).

Description

Technical Field

[0001] This invention relates to protective tape for wire harnesses. Background Technology

[0002] Patent Document 1 describes a protective tape for wire harnesses formed by providing an adhesive layer on a resin substrate. The adhesive layer is an adhesive resin tape formed by an adhesive composition. Furthermore, it describes an adhesive composition consisting of 100 parts by weight (non-volatile portion) of a main agent composed of a mixture of natural rubber latex and synthetic rubber latex, 40 to 120 parts by weight of a rosin-based tackifying resin with a softening point of 130 to 135°C, and 1 to 15 parts by weight of low molecular weight polyisoprene with a weight average molecular weight of 15,000 to 40,000.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-178008 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] However, the protective tape for wire harnesses in Patent Document 1 does not provide a balanced and good overall improvement in tape winding operability, tape end peeling suppression, and abrasion resistance.

[0008] The purpose of this invention is to provide a protective tape for wire harnesses that offers excellent winding operability, end peeling suppression, and abrasion resistance.

[0009] Technical means for solving technical problems

[0010] The protective tape for wire harnesses of the present invention is characterized by having a substrate and an adhesive layer formed on the substrate, the substrate comprising a thermoplastic resin, having a thickness of 120 μm or more and 190 μm or less, a 10% modulus (N / 19 mm width) of 12.5 or more and 18.5 or less, and an unwinding adhesive force (N / 19 mm width) of 0.8 or more and 4.5 or less.

[0011] Invention Effects

[0012] The protective tape for wire harnesses according to the present invention exhibits excellent advantages in tape winding operability, tape end peeling suppression, and abrasion resistance. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the protective tape for the wire harness according to the embodiment. Detailed Implementation

[0014] Hereinafter, a protective strip for wire harnesses according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the invention is not limited by this embodiment. Furthermore, the constituent elements of the following embodiments include elements readily conceived by those skilled in the art or substantially the same.

[0015] [Implementation Method]

[0016] Reference Figure 1 The following describes the implementation method. This implementation method relates to a protective tape for wire harnesses. Figure 1 It is a protective tape for wire harnesses in the implementation method.

[0017] The wire harness protective tape 10 of this embodiment is preferably used in automotive wire harnesses. The wire harness protective tape 10 of this embodiment is used when bundling wire harnesses or when fixing wire harness protective components to wire harnesses. Specifically, it can be used by wrapping around a bundling or fixing point.

[0018] The wire harness protective tape 10 of this embodiment includes a substrate 102 and an adhesive layer 104 formed on the substrate 102. Furthermore, the substrate 102 contains a thermoplastic resin with a thickness of 120 μm or more and 190 μm or less. Additionally, its 10% modulus (N / 19 mm width) is 12.5 or more and 18.5 or less, and its unwinding adhesion (N / 19 mm width) is 0.8 or more and 4.5 or less. Based on this, the wire harness protective tape 10 of this embodiment can comprehensively improve the tape winding operability, the suppression of tape end peeling, and the overall abrasion resistance.

[0019] In existing wire harnesses, thicker polyvinyl chloride (PVC) or polypropylene (PP) tapes, which provide abrasion resistance, are used for wire bundling or protection. A technical problem with these thicker tapes is the undesirable phenomenon of the tape ends peeling off after bundling. While improving the unwinding adhesion of the tape has improved peeling, it reduces the ease of wrapping the tape when bundling the wires. Furthermore, although measures have been taken to re-secure the peeling points with thinner tape, this incurs additional component costs and labor time. Therefore, there is a need for tapes that do not peel off at the tape ends and offer good wrapping ease.

[0020] Furthermore, considering the operability of the tape during winding, when the unwinding adhesive force is reduced, tape end peeling occurs after winding onto the wire. The causes of end peeling include low adhesive force and substrate shrinkage after the tape is peeled off. Therefore, the inventors of this invention discovered that because excessively high adhesive force increases the burden on the operator, it is necessary to use a substrate with low adhesive force and minimal shrinkage (deformation). Moreover, the inventors of this invention discovered that by exploring the 10% modulus of the tape, the range of unwinding adhesive force, and the range of substrate thickness, a tape that does not experience end peeling, has good winding operability, and also exhibits excellent abrasion resistance can be obtained.

[0021] The substrate 102, in other words, is a film made of a thermoplastic resin. Preferably, the thermoplastic resin is at least one selected from the group consisting of polyvinyl chloride (PVC), polypropylene, and polyethylene. Polyvinyl chloride is more preferred.

[0022] The adhesive layer 104 is typically formed from an adhesive composition. As the main component of the adhesive composition, examples of rubber-based materials include unmodified natural rubber latex, acrylic-modified natural rubber latex, and acrylic polymers. Specifically, from the viewpoint of unwinding adhesion, at least one material selected from the group consisting of unmodified natural rubber latex, acrylic-modified natural rubber latex, and acrylic polymers is preferred. In addition to the aforementioned main component, known additives may be added to the adhesive composition as needed. Examples of additives include tackifying resins such as rosin ester resins, terpene resins, aliphatic and aromatic hydrocarbon resins, softeners such as low molecular weight isoprene rubber (IR) and polyisobutylene, and antioxidants such as phenolic antioxidants.

[0023] The adhesive layer 104 is formed on the substrate 102 by a known method. For example, an adhesive composition is applied to the substrate 102 using various coating machines and dried to form the adhesive layer. Alternatively, the adhesive layer can be formed on a release liner beforehand and then transferred onto the substrate 102. Therefore, in the resulting wire harness protective tape 10 of this embodiment, the adhesive layer 104 comprises natural rubber latex and acrylic polymers. Specifically, from the viewpoint of unwinding adhesion, it comprises at least one selected from the group consisting of unmodified natural rubber latex, acrylic-modified natural rubber latex, and acrylic polymers. The thickness (paste thickness) of the adhesive layer 104 is preferably 5 μm or more and 50 μm or less.

[0024] Regarding the 10% modulus and unwinding adhesive force of the wire harness protective tape 10 in this embodiment, it can be controlled by appropriately adjusting the type or formulation ratio and thickness of the raw material components for the substrate 102 and the adhesive layer 104.

[0025] Furthermore, the wire harness protective tape 10 of this embodiment may also include layers other than the substrate 102 and the adhesive layer 104, as needed. For example, a primer layer such as nitrile rubber (NBR) may be provided between the substrate 102 and the adhesive layer 104. If a primer layer is provided, the adhesion of the adhesive layer 104 to the substrate 102 can be improved.

[0026] [Example]

[0027] The present invention will now be further described with reference to embodiments and comparative examples. The present invention is not limited to the following examples.

[0028] [Example 1]

[0029] A protective tape for wire harnesses is obtained by forming an nitrile rubber (NBR) base coating and a rubber-based adhesive layer on a polyvinyl chloride (PVC) substrate with a thickness of 140 μm. Specifically, the adhesive layer comprises unmodified natural rubber latex and acrylic-modified natural rubber latex, with a thickness ranging from 5 μm to 50 μm. Furthermore, Table 1 shows the 10% modulus (N / 19 mm width) and unwinding adhesion (N / 19 mm width) for the obtained protective tape for wire harnesses 10.

[0030] [Examples 2 to 6]

[0031] Except for appropriately changing the thickness of the substrate containing polyvinyl chloride (PVC), the formulation ratio of the main agent contained in the adhesive layer, and the thickness of the adhesive layer, a primer layer and an adhesive layer are formed on the substrate in the same manner as in Example 1 to obtain a protective tape for wire harnesses. Furthermore, the thickness of the adhesive layer is in the range of 5 μm to 50 μm. Table 1 shows the 10% modulus (N / 19 mm width) and unwinding adhesion (N / 19 mm width) for the obtained protective tape for wire harnesses 10.

[0032] [Comparative Examples 1 to 5]

[0033] Similar to Example 1, except for appropriate changes to the thickness of the polyvinyl chloride (PVC) substrate, the proportion of the main agent in the adhesive layer, and the thickness of the adhesive layer, a primer layer and an adhesive layer are formed on the substrate to obtain a protective tape for wire harnesses. Furthermore, the thickness of the adhesive layer is in the range of 5 μm to 50 μm. Table 1 shows the 10% modulus (N / 19 mm width) and unwinding adhesion (N / 19 mm width) for the obtained protective tape 10 for wire harnesses.

[0034] [Measurement Method]

[0035] [Tensile test (10% modulus)]

[0036] According to JIS Z 0237, for protective tape for wire harnesses (19mm wide), a tensile testing machine is used with the chuck clamping interval set to 100mm, and the tape is peeled off at a speed of 5mm / s. After peeling, the strength is read when the tape elongates by 10mm (10%).

[0037] [Low-speed unwinding adhesive force]

[0038] In accordance with JIS Z 0237, a tensile testing machine is used. A protective tape for the wire harness, wound in a roller shape, is inserted into the roller of the fixture and peeled off at a speed of 5 mm / s. The test points are 40 mm, 60 mm, and 80 mm, and the calculation is based on the average value of these three points.

[0039] 〔thickness〕

[0040] According to JIS C 2107, using a micrometer, cut five 19mm wide test pieces from the roller, let them rest for at least 5 minutes to remove deformation, and then allow the top surface of the gauge to fall quietly onto the surface of the test piece, reading the minimum value. Furthermore, for substrates containing polyvinyl chloride (PVC), the thickness is calculated in the same manner. Then, for each test piece, subtract the substrate thickness from the minimum value to obtain the adhesive layer thickness.

[0041] [Evaluation Method]

[0042] [Operational Determination]

[0043] Based on the test results of low-speed unwinding adhesive strength, the following criteria shall be used for judgment.

[0044] ○: 0.8N / 19mm width or more, 4.5N / 19mm width or less

[0045] ×: Less than 0.8N / 19mm width, or more than 4.5N / 19mm width

[0046] [End peeling]

[0047] After the wire harness, which is φ10mm in diameter, is wound with protective tape, it is placed at 80°C for 4 hours. Subsequently, the peeling at the end of the tape is confirmed.

[0048] ○: Peeling less than 1 mm was observed.

[0049] ×: Delamination of more than 1 mm was observed.

[0050] [Abrasion resistance]

[0051] Two test pieces (protective tape for wire harnesses) of appropriate length are attached to a φ10mm aluminum tube, overlapped (doubled), and placed in an abrasion tester specified in JASO D 608. A load of 4.4N is applied to the test pieces.

[0052] Then, the wear belt is moved at a speed of 1500 mm / min, and the belt length before the aluminum tube comes into contact with the belt is read.

[0053] ◎: 450mm or more

[0054] ○: 300mm or more but less than 450mm

[0055] ×: Less than 300mm

[0056] [Table 1]

[0057]

[0058] Explanation of reference numerals in the attached figures

[0059] 10: Protective tape for wire harnesses

[0060] 102: Substrate

[0061] 104: Adhesive layer

Claims

1. A protective tape for wire harnesses, characterized in that, It has a substrate and an adhesive layer formed on the substrate. The substrate comprises a thermoplastic resin and has a thickness of 120 μm to 190 μm. The 10% modulus, calculated based on N / 19mm width, is between 12.5 and 18.

5. The unwinding adhesive force, measured in N / 19mm width, is between 0.8 and 4.

5.

2. The protective tape for wire harnesses according to claim 1, The thermoplastic resin is at least one selected from the group consisting of polyvinyl chloride, polypropylene and polyethylene.

3. The protective tape for wire harnesses according to claim 1 or 2, The adhesive layer comprises at least one selected from the group consisting of unmodified natural rubber latex, acrylic-modified natural rubber latex, and acrylic polymers.

4. The protective tape for wire harnesses according to claim 1 or 2, The thickness of the adhesive layer is more than 5 μm and less than 50 μm.

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