JP6689704B2 - Binding tape - Google Patents

Description

  The present invention relates to a binding tape used for binding wiring, electric wires and the like.

2. Description of the Related Art Conventionally, a binding tape has been used to bind wires such as communication cables and various electric wires such as electric wires for automobiles (wire harnesses for automobiles).
As a tying tape, a film layer is laminated on one surface of the cushioning material layer with a hot melt adhesive or the like, and an adhesive layer is applied to the other surface of the cushioning material layer to form a three-layer structure, which is used for binding cables and the like. There is a binding tape that is folded with the pressure-sensitive adhesive layer inside so as to sandwich a cable or the like, and the pressure-sensitive adhesive layers are stacked and bonded (Patent Document 1).

  However, a three-layer binding tape in which a film layer is laminated on one surface of a buffer material layer with a hot melt adhesive or the like causes the film layer on the surface to be a buffer material when the ambient temperature rises to about 80 ° C. in a bent state. It could be partially peeled from the layer.

JP, 2014-31432, A

  The present invention has been made in view of the above points, and an object of the present invention is to provide a binding tape having a high peel strength in which the surface layer is not easily peeled off even at a high temperature.

According to a first aspect of the present invention, there is provided a buffer material layer made of an olefin resin foam, a protective layer made of an olefin resin or an olefin thermoplastic elastomer directly laminated on one surface of the buffer material layer, and the buffer material layer. have a pressure-sensitive adhesive layer having a self-adhesive laminated on the other surface, has a film layer laminated directly on the surface of the protective layer, the film layer, a laminate of the stretched film and non-stretched film According to the binding tape, the stretched film is on the outside .

  According to the present invention, since the protective layer made of the olefin resin or the olefin thermoplastic elastomer is directly laminated on one surface of the buffer layer made of the olefin resin foam, the adhesive strength between the protective layer and the buffer layer is high. The peel strength of the protective layer at high temperature is high. In addition, when it has a film layer directly laminated on the surface of the protective layer, the adhesive strength between the cushioning material layer and the protective layer and the adhesive strength between the protective layer and the film layer are high, and the peel strength of the film layer at high temperature is high. Become.

It is sectional drawing of the binding tape which concerns on the reference form of this invention. It is sectional drawing of the binding tape which concerns on embodiment of this invention.

The binding tape 10A of the reference embodiment shown in FIG. 1 is formed of a tape having a predetermined width, and has a cushioning material layer 11A, a protective layer 21A on one surface of the cushioning material layer 11A, and an adhesive on the other surface of the cushioning material layer 11A. Layer 31A.

  The buffer material layer 11A is made of an olefin resin foam. Examples of the olefin resin foam include polyethylene foam and polypropylene foam.

  The olefin resin foam constituting the buffer material layer 11A has an expansion ratio of 5 to 100 times, preferably 10 to 50 times, and a thickness of 0.5 to 6 mm, preferably 0.6 to 4 mm, More preferably, it is 0.7 to 3 mm. When the expansion ratio is less than 5 times or the thickness is less than 0.5 mm, the buffering property is poor, the binding fixing property when the binding tape 10 is wound around a cable or the like is poor, and the workability is poor. On the other hand, if the expansion ratio exceeds 100 times or the thickness exceeds 6 mm, the workability at the time of bundling becomes poor, and the diameter of the binding tape 10 when wrapped around a cable or the like becomes too large, which is an obstacle. To become.

  The olefin resin foam forming the buffer material layer 11A preferably has an open cell structure. By having an open cell structure, the cushioning material layer 11A is easily compressed and deformed, and workability when the binding tape 10A is wound around a cable or the like is improved. The open-cell structure may be either an open-cell structure formed by blending, or a foam formed by the closed-cell structure may be crushed by a calender roll to break (rupture) the closed-cell structure to form an open-cell structure. But it's okay.

  The protective layer 21A is made of an olefin-based resin or an olefin-based thermoplastic elastomer that is directly laminated on one surface of the buffer material layer 11A without an adhesive such as a hot-melt adhesive. The direct lamination of the protective layer 21A can be performed by a single lamination in the known direct lamination or extrusion lamination. The direct laminating or extrusion laminating (single laminating) of the protective layer 21A is performed on an offine resin foam sheet unwound from a roll around which the olefin resin foam sheet constituting the cushioning material layer 11A is wound, It is carried out by extruding an olefin resin or an olefin thermoplastic elastomer from an extruder and unwinding it through a cooling roll.

  The adhesion of the olefin-based resin or the olefin-based thermoplastic elastomer to the buffer material layer 11A is performed by the adhesiveness when the olefin-based resin or the olefin-based thermoplastic elastomer directly laminated on the buffer material layer 11A is cured. There is. By forming the protective layer 21A with an olefin-based resin or an olefin-based thermoplastic elastomer directly laminated on one surface of the buffer material layer 11A, the adhesive strength between the protective layer 21A and the buffer material layer 11A is increased. The peel strength of the protective layer 21A at high temperature is increased.

Examples of the olefin resin forming the protective layer 21A include polypropylene and polyethylene.
The olefin-based thermoplastic elastomer constituting the protective layer 21A has a polyolefin such as polypropylene (PP) or polyethylene (PE) as a hard segment and a rubber component such as ethylene-propylene rubber (EPM, EPDM) as a soft segment. It is a thermoplastic elastomer and has elasticity at room temperature.

  The thickness of the protective layer 21A is preferably 60 to 300 μm, more preferably 100 to 200 μm. When it is less than 60 μm, it is too thin to obtain a function as a protective layer. On the other hand, if it exceeds 300 μm, it is too thick, and it becomes difficult to wind the binding tape 10A around the cable or the like during the binding work.

  The adhesive layer 31A is composed of an adhesive having self-adhesiveness. The self-adhesive property refers to a property in which the same adhesives exhibit adhesiveness and different partners do not exhibit adhesiveness. In the case of an adhesive having self-adhesiveness, the same adhesives are stacked and lightly pressed to adhere to each other, and an appropriate peeling force is required for peeling. The self-adhesive adhesive is composed of natural rubber latex mixed with an adhesion aid. As a tackifier, as a tackifier (tackifier), a terpene resin, a rosin ester resin, a petroleum resin (fatty acid, aromatic), a phenolic antioxidant as an antioxidant, and a solvent. An organic solvent such as toluene may be used.

  Further, it is preferable that the adhesive contains a polyolefin emulsion as an additive. The polyolefin-based emulsion is one in which polyolefin resin particles are dispersed in water using an emulsifier or a dispersant. By using the aqueous dispersion, the thickness of the pressure-sensitive adhesive layer 31A can be reduced, the flexibility of the binding tape 10A can be increased, and the binding workability can be improved. The polyolefin emulsion may be produced by various known production methods, or a commercially available product may be used. Examples of known production methods include a method of emulsion polymerization in the presence of an emulsifier in an aqueous medium, and a method of stirring and mixing a molten resin and an aqueous medium in the presence of shearing force.

  The pressure-sensitive adhesive that constitutes the pressure-sensitive adhesive layer 31A is prepared by charging a homomixer tank with a pressure-sensitive adhesive aid and the like, and then performing normal rotation and reverse rotation for about 30 minutes each at a rotation speed of about 4500 rotations / minute, After that, a predetermined amount of natural rubber latex is blended. The adhesion thickness of the pressure-sensitive adhesive to the buffer material layer 11A (thickness of the pressure-sensitive adhesive layer) is not particularly limited, but is preferably about 10 to 50 μm.

  The binding tape 10A is manufactured by directly laminating the protective layer 21A on one surface of the cushioning material layer 11A by direct lamination or extrusion lamination (single lamination), and then applying the adhesive to the other surface of the cushioning material layer 11A. It can be performed by applying using a known laminator or applicator to form the pressure-sensitive adhesive layer 31A.

The binding tape 10B of the embodiment shown in FIG. 2 is formed of a tape having a predetermined width, and includes a cushioning material layer 11B, a protection layer 21B on one surface of the cushioning material layer 11B, and a film layer 210B on the surface of the protection layer 21B. , And the adhesive layer 31B on the other surface of the cushioning material layer 11B.

The cushioning material layer 11B is made of an olefin resin foam, and has the same material and thickness as the cushioning material layer 11A of the reference embodiment .

  The protective layer 21B is made of an olefin-based resin or an olefin-based thermoplastic elastomer that is directly laminated on one surface of the buffer material layer 11B without using an adhesive such as a hot-melt adhesive. The direct lamination of the protective layer 21B is carried out by known sandwich lamination in extrusion lamination. The extruded laminate (sandwich laminate) of the protective layer 21B is a sheet of the offine resin foam unwound from a roll around which the sheet of the olefin resin foam forming the cushioning material layer 11B is wound, and the film layer 210B. Between the film wound from the roll in which the film constituting the film is wound, an olefin resin or an olefin thermoplastic elastomer is extruded from an extruder, and the olefin resin is placed between the film of the offine resin foam and the film. Alternatively, the olefin-based thermoplastic elastomer is sandwiched and unwound through a cooling roll.

  The adhesion of the olefin resin or the olefin thermoplastic elastomer constituting the protective layer 21B to the buffer material layer 11B and the adhesion between the protective layer 21B and the film layer 210B are performed by the olefin resin constituting the protective layer 21B or This is performed by the adhesiveness when the olefinic thermoplastic elastomer is cured.

  By forming the protective layer 21B with an olefin-based resin or an olefin-based thermoplastic elastomer that is directly laminated on one surface of the buffer material layer 11B, the adhesive strength between the protective layer 21B and the buffer material layer 11A is increased. The peel strength of the protective layer 21B at high temperature is increased.

The olefin resin and the olefin thermoplastic elastomer forming the protective layer 21B are the same as the olefin resin and the olefin thermoplastic elastomer forming the protective layer 21A of the reference embodiment .

Since the protective layer 21B has the film layer 210B on the surface, it is preferable that the protective layer 21B has a thickness smaller than that of the protective layer 21A of the reference embodiment so as not to impair the flexibility of the binding tape 10B during the binding operation. Specifically, the thickness of the protective layer 21B is preferably 10 to 50 μm, more preferably 12 to 40 μm. When it is less than 10 μm, it is too thin to obtain a function as a protective layer. On the other hand, if it exceeds 50 μm, it is too thick, and it becomes difficult to wind the binding tape 10B around the cable or the like during the binding work.

  The film layer 210B is directly laminated on the surface of the protective layer 21B without an adhesive such as a hot-melt adhesive. Further, the olefin resin or olefin thermoplastic elastomer constituting the protective layer 21B is directly laminated on the buffer material layer 11B, and the film layer is formed on the olefin resin or olefin thermoplastic elastomer constituting the protective layer 21B. By the structure in which 210B is directly laminated, the adhesive strength of the protective layer 21B to the cushioning material layer 11A and the adhesive strength of the film layer 210B to the protective layer 21B are increased, whereby the film layer 210B at high temperature is increased. Peel strength is increased.

  The material of the film layer 210B is not particularly limited, and examples thereof include polyethylene, polypropylene, polyamide, and polyethylene terephthalate. The film forming the film layer 210B is manufactured by a known film forming method such as a T-die method, a ring die method (an inflation method) or the like.

  The film layer 210B is preferably a laminate of a stretched film and a non-stretched film. By using a laminate of a stretched film and a non-stretched film, it is possible to obtain a film layer which is excellent in tensile strength and tear strength, has a soft feeling, has high abrasion resistance, and is easily adapted. Further, it is preferable that the stretched film is on the outer side and the non-stretched film is on the inner side (the protective layer 21B side). As a result, the wear resistance on the outer side is improved and the binding workability is improved. The stretched film is more preferably a biaxially stretched film from the viewpoint of improving strength and abrasion resistance.

  The method for laminating the stretched film and the non-stretched film is not limited, and wet lamination (using an aqueous adhesive or water dispersion adhesive), dry laminating (solvent adhesive or reactive adhesive), hot melt lamination ( It may be a laminate using an adhesive such as a hot melt adhesive) or an extrusion laminate.

The pressure-sensitive adhesive layer 31B is composed of a pressure-sensitive adhesive having self-adhesiveness, and is the same as the pressure-sensitive adhesive layer 31A of the reference embodiment .

  The binding tape 10B is manufactured by directly laminating the protective layer 21B and the film layer 210B on one surface of the buffer material layer 11B by extrusion lamination (sandwich lamination), and then applying the adhesive to the other surface of the buffer material layer 11B. This can be performed by applying the agent using a known laminator or applicator to form the pressure-sensitive adhesive layer 31B.

  The binding tapes 10A and 10B are used for binding cables such as communication cables and various electric wires such as electric wires for automobiles (wiring harnesses for automobiles) with the adhesive layers 31A and 31B inside. It is folded so as to be sandwiched from the outside, and the pressure-sensitive adhesive layers 31A and 31B are overlapped and lightly pressed.

  The binding tapes 10A, 10B have good wear resistance due to the protective layer 21A on the outer surface or the film layer 210B on the surface of the protective layer 21B, and are bound by the cushioning properties of the cushioning material layers 11A, 11B serving as intermediate layers. Protects cables and other cables and improves workability. Furthermore, since the pressure-sensitive adhesive layers 31A and 31B, which are the innermost surfaces that come into contact with cables and the like, have self-adhesiveness, they do not stick to the cables and the like during bundling work, and the bundling work is easy, and after bundling Also in the above, since the adhesive layers 31A and 31B are not adhered to the cable or the like, it is possible to shift the binding tapes 10A and 10B on the cable in a bound state and adjust the binding position.

Furthermore, in the binding tape 10A of the reference embodiment, since the protective layer 21A on the outer surface is directly laminated (direct laminated or extrusion laminated) on the buffer material layer 11A, the adhesive strength between the protective layer 21A and the buffer material layer 11A. And the peel strength of the protective layer 21A at high temperature is high.

Furthermore, binding tape 10B embodiment, the protective layer 21B is directly laminated (extrusion lamination) in the buffer material layer 11A, and is directly laminated (extrusion lamination) to the surface of the film layer 210B is the protective layer 21B Therefore, the adhesive strength between the cushioning material layer 11B and the protective layer 21B and the adhesive strength between the protective layer 21B and the film layer 210B are high, and the peel strength of the film layer 210B at high temperature is high.

・Reference example 1
Reference Example 1 is an example of the first embodiment in which a film layer is not provided on the surface of the protective layer. The protective layer is PP (polypropylene resin), deflection temperature under load: about 110 ° C. (JIS K6921-2), and thickness is 150 μm. The cushioning material layer is made of PP (polypropylene foam), open cells, expansion ratio of 20 times, thickness of 1.8 mm, product number: FOLEC LZ-2000, manufactured by Inoac Corporation. The pressure-sensitive adhesive layer is a self-adhesive pressure-sensitive adhesive (product number: Inotac, manufactured by Inoac Corporation) and has a thickness of 20 μm.

・Reference example 2
Reference example 2 is an example of a reference mode in which a film layer is not provided on the surface of the protective layer. The protective layer is TPO (olefin-based thermoplastic elastomer), deflection temperature under load: about 100 ° C. (JIS K6921-2), and thickness is 150 μm. The buffer material layer and the pressure-sensitive adhesive layer are the same as in Reference Example 1.

-Example 3
Example 3 is an example of an embodiment having a film layer directly laminated to the surface (outer surface) of the protective layer. The protective layer is PP (polypropylene resin), deflection temperature under load: about 110 ° C. (JIS K6921-2), and thickness is 15 μm. The film layer is a laminated body (OPP # 50 / DL / CPP # 50) film (manufactured by Toppan Printing Co., Ltd.) in which OPP (biaxially oriented polypropylene) and CPP (non-oriented polypropylene) are dry laminated (DL), and the thickness is 100 μm. , CPP (unstretched polypropylene) was used as the cushioning material layer side. The buffer material layer and the pressure-sensitive adhesive layer are the same as in Reference Example 1.

-Example 4
Example 4 is an example of an embodiment having a film layer directly laminated to the surface (outer surface) of the protective layer. The cushioning material layer was made of PE (polyethylene foam), open cells, expansion ratio of 30 times, thickness of 2.0 mm, product number: PE Light LH3002, manufactured by Inoac Corporation, and other configurations were the same as in Example 3. is there.

-Example 5
Example 5 is an example of an embodiment having a film layer laminated directly to the surface (outer surface) of the protective layer. The film layer is a laminate (stretched PET # 25 / DL / CPP # 50) film (manufactured by Toppan Printing Co., Ltd.) obtained by dry laminating (DL) stretched PET (biaxially stretched polyethylene terephthalate) and CPP (unstretched polypropylene), thickness. The thickness was 75 μm, and CPP (unstretched polypropylene) was used as the buffer material layer side. Other configurations are similar to those of the third embodiment.

-Comparative example 1
In Comparative Example 1, an olefin-based hot melt adhesive (HM-1) and a softening point of about 96 ° C. (JAI-7 (ring and ball method)) were used as the protective layer of Example 3, and the olefin-based hot melt adhesive was used. This is an example in which the same laminate film as in Example 3 was laminated and adhered after being applied to one surface of the buffer material layer with a thickness of 35 μm. Other configurations are similar to those of the third embodiment.

・ Comparative example 2
Comparative Example 2 uses a modified olefin-based hot melt adhesive (HM-2) as the protective layer of Comparative Example 1 and a softening point of about 157 ° C. (JAI-7 (ring and ball method)), and uses the modified olefin-based hot melt adhesive. In this example, the agent is applied to one surface of the buffer material layer with a thickness of 35 μm, and then the same laminate film as in Example 3 is laminated and adhered. The other configurations are the same as those in Example 3 and Comparative Example 1.

Tape abrasion, heat resistant laminating property, and heat resistant peel strength were measured for Reference Example 1, Reference Example 2, Examples 3 to 5 and Comparative Examples 1 and 2. The measurement results are shown in Table 1. In the comprehensive evaluation of Table 1, the overall evaluation is “◎” when all the results are “◯”, and the overall evaluation is “x” when even one is “×”.

  Tape abrasion is JASO D608-92, heat resistant low voltage electric wire for automobiles 5.12. (1) Measured based on the abrasion tape method. The evaluation was "O" when the measurement result was 3000 mm or more, and "X" when it was less than 3000 mm.

The heat-resistant laminating property was measured by folding the binding tape of each Reference Example, each Example and each Comparative Example 180 degrees with the pressure-sensitive adhesive layer inside and stacking the pressure-sensitive adhesive layers to self-adhesive, and then measuring the diameter 3 It was wound around an inch paper tube and fixed, and after 120 hours under an atmosphere of 80 ° C., it was confirmed whether or not there was peeling between the cushioning material layer and the protective layer. The evaluation was "O" when there was no peeling and [X] when there was peeling.

  For heat-resistant peel strength, prepare three test pieces each having a width of 25 mm and a length of 125 mm (N = 3), at an atmospheric temperature of 80 ° C., using a T-type peel tester, a test speed of 300 mm / min, and a gripping distance of 100 mm. (Peeling margin: 25 mm), the peeling load was measured by averaging the maximum values of the test force. The evaluation was "O" when it was 1N or more, and "X" when it was less than 1N.

In each of Reference Example 1, Reference Example 2, and Examples 3 to 5, tape abrasion, heat-resistant laminating property, and heat-resistant peel strength are all “◯”, and the comprehensive evaluation is “⊚”, and the peel strength at high temperature is high. It was a thing.
On the other hand, in Comparative Examples 1 and 2, both the heat-resistant laminating property and the heat-resistant peel strength were evaluated as “x”, and the peel strength at high temperature was higher than that of Reference Example 1, Reference Example 2, and Examples 3 to 5. It was inferior.

  As described above, according to the present invention, a binding tape having a high peel strength of the surface layer at high temperature can be obtained.

10A, 10B Bundling tape 11A, 11B Buffer material layer 21A, 21B Protective layer 210B Film layer 31A, 31B Adhesive layer

Claims (1)

A buffer material layer made of an olefin resin foam, a protective layer made of an olefin resin or an olefin thermoplastic elastomer directly laminated on one surface of the buffer material layer, and a self layer laminated on the other surface of the buffer material layer. have a pressure-sensitive adhesive layer having adhesiveness,
Having a film layer directly laminated on the surface of the protective layer,
A tying tape , wherein the film layer comprises a laminate of a stretched film and a non-stretched film, and the stretched film is on the outside .

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