ADHESIVE TAPE

Abstract

The subject of the invention is an adhesive tape, in particular a wrapping tape for bundling cables in automobiles. Said tape is provided with a tape-like carrier and with an adhesive coating applied to all or part of one or two sides of the carrier. The carrier is constructed merely of a planar structure layer on the basis of plastic fibres. According to the invention, the carrier requires a piercing force of more than 0.2 N/m.sup.2 mass per unit area of the carrier when pierced with a needle having a diameter of 0.14 mm to 0.16 mm.

Claims

1. An adhesive tape, particularly wrapping tape for bundling cables in automobiles, the tape comprising: a substrate strip, and an adhesive coating that is applied to all or part of one or both sides of the strip, the strip being composed of only one textile layer made of plastic filaments, the strip requiring a puncture force of greater than 0.2 N per 10 g/m.sup.2 weight per unit area of the strip with a puncture needle having a diameter of from 0.14 mm to 0.16 mm.

2. The adhesive tape according to claim 1, wherein the strip requires a puncture force of greater than 0.3 N per 10 g/m.sup.2 weight per unit area of the strip.

3. The adhesive tape according to claim 1, wherein the plastic filaments of the strip are composed entirely or partially of a polyamide.

4. The adhesive tape according to claim 3, wherein the plastic filaments of the strip are aromatic polyamide filaments.

5. The adhesive tape according to claim 1, wherein the strip is constructed from mixed polyamide filaments and polyester filaments.

6. The adhesive tape according to claim 1, wherein the strip is a textile substrate or nonwoven substrate.

7. The adhesive tape according to claim 6, wherein the nonwoven substrate is physically bonded by being sewn over with yarns and/or needled with water jets and/or air jets and/or calendered by rolling.

8. The adhesive tape according to claim 6, wherein the nonwoven substrate is chemically bonded by application of binder.

9. The adhesive tape according to claim 1, wherein the strip has a weight per unit area of at least 40 g/m.sup.2.

10. A method of testing a wrapping tape for bundling cables in a motor vehicle, the method comprising the step of: securing a sample piece of the wrapping tape to an underlayment over a groove or opening therein; pressing against the secured tape on the underlayment a needle having a tip with a diameter of from 0.14 mm to 0.16 mm; increasing and monitoring the force applied by the tip to the underlayment; and determining the applied force when the needle pierces the tape.

11. The method according to claim 10, further comprising the step of: approving for use the tape when the determined force exceeds 0.2 N per 10 g/m.sup.2 weight per unit area of the strip

Description

EMBODIMENT

[0034] 1. A specimen, more particularly a square sample piece with a side length of about 20 mm and a weight per unit area of 60 g/m.sup.2, is produced and clamped on the above-described underlayment for the purpose of measuring puncture resistance or puncture force. The sample piece of the first example is formed with a substrate that is made of a polyester nonwoven that is additionally reinforced with sewing yarns in a manner comparable to a so-called Maliwatt. The individual synthetic filaments of the polyester nonwoven are staple fibers.

[0035] The measured puncture force is 0.16 N. Made of the weight per unit area of 60 g/m.sup.2, this results in a puncture force of about 0.03 N per 10 g/m.sup.2 weight per unit area of the strip composed of the polyester nonwoven.

[0036] The puncture force of this adhesive tape according to the prior art thus falls short of the puncture force of greater than 0.2 N per 10 g/m.sup.2 required according to the patent by nearly a factor of 10.

[0037] 2. In contrast, as a comparative and second example, an adhesive tape according to the invention was examined for puncture resistance. In this case, an aramid nonwoven backing is used as the strip, the nonwoven or nonwoven substrate being bonded by water jet needling. For purposes of comparison, the weight per unit area of the strip is about 60 g/m.sup.2 here as well.

[0038] The puncture force measured here is 4.7 N. This results in a puncture force of 0.78 N per 10 g/m2 weight per unit area of the strip, so that the inventive limit of 0.2 N/10 g/m.sup.2 weight per unit area of the strip is clearly exceeded.