CABLE WINDING TAPE, IN PARTICULAR FOR AN ENGINE COMPARTMENT OF AN AUTOMOTIVE VEHICLE

Abstract

A cable wrapping tape, in particular for the engine compartment of an automobile, has a strip-like carrier consisting of fabric, said carrier is provided at least on one side with a self-adhering adhesive layer which consists of a pressure-sensitive adhesive, wherein the fabric of the carrier consists of a yarn which is formed from a polyamide material and which has a yarn strength of at least 280 dtex. The yarn is formed from 24 to 80 filaments, and the cable wrapping tape meets abrasion class E according to LV 312 both on a mandrel having a 5 mm diameter and on a mandrel having a 10 mm diameter. For increasing the abrasion resistance, it is proposed that the filaments are twisted with one another about a central longitudinal axis (X-X) of the yarn.

Claims

1. A cable wrapping tape comprising a strip carrier consisting of fabric, the carrier on at least one side having a self-adhering adhesive layer consisting of a pressure-sensitive adhesive, wherein the fabric of the carrier consists of a yarn consisting of filaments of a polyamide material and having a yarn linear density of at least 280 dtex, the yarn forming warps and wefts in the fabric of the carrier, wherein the filaments have a number of twists based on a meter length (T/m) in the range of 10 to 400 and whereby only the filaments of the yarn of the warp, only the filaments of the yarn of the weft, or both the filaments of the yarn of the warp and weft are twisted with one another about the central longitudinal axis (X-X) of the yarn, wherein the cable wrapping tape meets abrasion class E or higher, according to LV 312 both on a mandrel having a 5 mm diameter and on a mandrel having a 10 mm diameter.

2. The cable wrapping tape according to claim 1, wherein the warp extends in the longitudinal direction of the cable wrapping tape, and the weft extends in the transverse direction of cable wrapping tape.

3. The cable wrapping tape according to claim 1, wherein the cable wrapping tape has a thickness D of less than 0.50 mm.

4. The cable wrapping tape according to claim 1, wherein the carrier has a grammage from 130 to 250 g/m.sup.2.

5. The cable wrapping tape according to claim 1, wherein the number of warp threads in the fabric of the carrier lies in the range from 17 to 60 per cm.

6. The cable wrapping tape according to claim 1, wherein the number of weft threads in the fabric of the carrier lies in the range from 10 to 30 per cm.

7. The cable wrapping tape according to claim 1, wherein the yarn linear density lies in the range from 280 dtex to 1000 dtex.

8. The cable wrapping tape according to claim 1, wherein the yarn is formed from 48 to 80 filaments.

9. The cable wrapping tape according to claim 1, wherein the yarn is intermingled with 8 to 26 intermingling points per meter.

10. The cable wrapping tape according to claim 1, wherein the filaments of the yarn are textured.

11. The cable wrapping tape according to claim 1, wherein the cable wrapping tape has an elongation at break of 28% to 35%.

12. The cable wrapping tape according to claim 1, wherein the cable wrapping tape withstands a breaking force in the range from 600 N/cm to 800 N/cm.

13. The cable wrapping tape according to claim 1, wherein the pressure-sensitive adhesive of the self-adhering adhesive layer is an acrylate adhesive.

14. The cable wrapping tape according to claim 1, wherein the pressure-sensitive adhesive in the adhesive layer is applied with a specific surface weight from approximately 60 to 150 g/m.sup.2.

15. The cable wrapping tape according to claim 1, wherein the adhesive force on the tape backs lies in the range from 5.0 to 10.0 N/cm.

16. The cable wrapping tape according to claim 1, wherein the adhesive force on steel lies in the range from 6.0 to 10.0 N/cm.

17. The cable wrapping tape according to claim 1, wherein the unwind adhesion lies in the range from 2.0 to 5.0 N/19 mm.

18. The cable wrapping tape according to claim 1, wherein the twisted yarn comprises a right-hand twist, a left-hand twist, or a combination thereof.

19. The cable wrapping tape according to claim 1, wherein the filaments have a number of twists based on a meter length (T/m) in the range of 140 to 260.

20. The cable wrapping tape according to claim 1, wherein the cable wrapping tape meets abrasion class F or G, according to LV 312 both on a mandrel having a 5 mm diameter and on a mandrel having a 10 mm diameter.

21. A cable wrapping tape comprising a strip carrier consisting of fabric, the carrier on at least one side having a self-adhering adhesive layer consisting of a pressure-sensitive adhesive, the carrier having a grammage from 130 to 250 g/m.sup.2, wherein the fabric of the carrier consists of a yarn consisting of filaments of a polyamide material and having a yarn linear density of at least 280 dtex, the yarn forming warps and wefts in the fabric of the carrier, such that the warps extend in the longitudinal direction of the cable wrapping tape, and the wefts extend in the transverse direction of cable wrapping tape, wherein the filaments have a number of twists based on a meter length (T/m) in the range of 10 to 400 and whereby only the filaments of the yarn of the warp, only the filaments of the yarn of the weft, or both the filaments of the yarn of the warp and weft are twisted with one another about the central longitudinal axis (X-X) of the yarn, wherein the cable wrapping tape has a thickness that is smaller than 0.50 mm and meets abrasion class E or higher, according to LV 312 both on a mandrel having a 5 mm diameter and on a mandrel having a 10 mm diameter.

22. The cable wrapping tape according to claim 21, wherein the yarn is intermingled with 8 to 26 intermingling points per meter.

23. The cable wrapping tape according to claim 21, wherein the cable wrapping tape meets abrasion class F or G, according to LV 312 both on a mandrel having a 5 mm diameter and on a mandrel having a 10 mm diameter.

24. The cable wrapping tape according to claim 21, wherein the filaments have a number of twists based on a meter length (T/m) in the range of 140 to 260.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 shows a perspective cross-section through an inventive cable wrapping tape, and

[0020] FIG. 2 shows the view of two yarns for manufacturing a fabric carrier for an inventive cable wrapping tape.

DETAILED DESCRIPTION OF THE DRAWINGS

[0021] As is apparent from FIG. 1, an inventive cable wrapping tape, in particular a cable wrapping tape specified for use in the engine compartment of an automobile, comprises a strip-like carrier 1 consisting of fabric, said carrier is provided on at least one side with a self-adhering adhesive layer 2 which consists of a pressure-sensitive adhesive. On a mandrel having a 5 mm diameter, as well as on a mandrel having a 10 mm diameter, the cable wrapping tape meets at least abrasion class E according to LV 312. However abrasion class F or even G according to LV 312 can also be met.

[0022] The fabric of the carrier 1 consists of a yarn 3a, 3b which is formed from a polyamide material, in particular from PA 6.6, and which has a yarn weight of more than 280 dtex, in particular of 470 dtex. In general, in the context of the invention it can be provided in particular that the yarn weight lies in the range of 280 dtex to 1000 dtex, preferably in the range of 300 dtex to 470 dtex.

[0023] The yarn 3a, 3b which is exemplarily illustrated in FIG. 2 in two embodiments, is formed from 24 to 80 filaments 4, in particular from 48 to 80 filaments 4, preferably from 68 filaments 4. No staple fibers have been used for forming the yarn 3a, 3b.

[0024] The filaments 4 are inventively twisted with one another about a central longitudinal axis X-X of the yarn 3a, 3b, wherein they have in particularbased on a meter lengtha number of twists (T/m) in the range of 10 to 400, preferably in the range of 140 to 260. The starting point for the specification of the number of twists (T/m) in this case is of course a substantially parallel layer of the filaments 4 in an untwisted yarn.

[0025] Here this substantially parallel layer is not only understood to mean that a certain skew of the filaments 4 to one another over the length in an untwisted yarn can never be ruled out, but also that an untwisted yarn can be intermingled, wherein in particular 8 to 26 intermingling points per meter can be present. The interminglingalso referred to as interlacingis an additional finishing of the yarn threads wherein the filaments 4 of the yarn are intertwined at points by a swirling with air. The cohesion of the individual filaments 4 is thus not achieved by a twisting, but by an interlacing of the filaments 4. Such intermingling points, which represent interlace knots, which generally do not disappear during twisting, are indicated in FIG. 1 by the reference number 5. The intermingling can be carried out with smooth filaments 4, however it is also possible, and inventively preferred, to combine an intermingling with a texturing.

[0026] The texturing advantageously contributes to the abrasion resistance. In the textile industry, texturing refers here to a process whereby synthetic fibers can be permanently rippled. Due to this finishing, the smooth synthetic filaments 4 or yarns 3a, 3b obtain a character similar to that of natural fiber and a textile feel. The texturing usually takes place under the influence of heat and pressure, wherein a thermoplasticity of the fibers is exploited. Fiber loops are generated by a rippling of the fibers during the texturing, whereby an increase in volume results, wherein the elastic ductility increases while the thermal conductivity decreases. A variety of in particular mechanical, mechanical-thermal, and chemical-thermal methods are known for carrying out the texturing.

[0027] The threads of the yarn 3a, 3b form warps in the carrier 1, said warps preferably extend in the longitudinal direction of the tape, and wefts which preferably extend in the transverse direction of the tape.

[0028] As is apparent from the drawings, different directions of rotation can be used for the yarns 3a, 3b. Thus the yarn 3a illustrated at the left side of FIG. 2 can have a right-hand twist where it is evident that when the thread is hung vertically, the individual filaments 4 extend parallel to the slant of an S. The yarn 3b illustrated at the right side of FIG. 2 has a left-hand twist where it is evident that when the thread is hung vertically, the individual filaments 4 extend parallel to the slant of a Z. In the fabric of the carrier 1 according to FIG. 1, the yarns 3a lying substantially vertical in the image plane are those with left-hand twist of their filaments 4, and the yarns 3b lying substantially horizontal in the image plane are those with right-hand twist of their filaments 4.

[0029] The cable wrapping tape has a thickness which is indicated by reference number D and is smaller than 0.50 mm. In particular, the thickness D lies in a range of 0.28 to 0.32 mm. The thickness D of the cable wrapping tape is composed here of the thickness D1 of the carrier 1 and the thickness D2 of the adhesive layer 2, which is determined by the gram mage and the thickness of the adhesive.

[0030] In particular, a cable wrapping tape was manufactured as an exemplary embodiment for the invention, the carrier 1 of said cable wrapping tape had the fabric construction reproduced in Table 2 below. The parameters specified in Table 2 as basic data of the carrier 1 were determined according to the following standards: DIN EN ISO 2286-1 (1998-07) for the specific weight of the carrier 1, fiber strength (linear density in dtex) according to DIN 53830-3 (1981-05), thread thickness according to DIN EN 1049-2 (1994-02), and DIN EN ISO 9237 (1995-12) for the air permeability.

[0031] With regard to Table 2 it is highlighted here that the air permeability, i.e. the porosity, of the carrier 1 increases only to a slight extent due to the twisting of the filaments 4 in the yarns 3a, 3b. This advantageously affects the coatability of the carrier 1 with adhesive, the viscosity of said adhesive need not be changed much or at all in comparison to conventional tape.

[0032] The carrier 1 was coated on one side with approximately 100 g/m.sup.2 of a UV-curing acrylate adhesive. For forming the adhesive coating 2, the acrylate was cured and the material wound on itself. The roll thus formed was subsequently assembled in a desired manner as adhesive tape wound on itself.

TABLE-US-00002 TABLE 2 Construction of the Fabric of the Carrier 1 of an Inventive Cable Wrapping Tape Compared to a Known Carrier Fabric Parameter Unit Comparison Carrier Invention Material PA Fabric PA fabric Material Type PA 6.6 PA 6.6 Warp Filament Type Smooth or Textured; Smooth or Textured; Piece-Dyed Piece-Dyed Weft Filament Type Smooth or Textured; Smooth or Textured; Piece-Dyed Piece-Dyed Grammage g/m.sup.2 185 5 185 5 Air Permeability l/m.sup.2s 50-200 50-400 Warp Yarn Weight dtex 470 470 Weft Yarn Weight dtex 470 470 Warp Filament Count 68 68 Weft Filament Count 68 68 Warp Twist Direction None S or Z Weft Twist Direction None S or Z Warp Twist Count T/m 0 180 5 Weft Twist Count T/m 0 180 5 Warp Yarn Thread 1/cm 20 3 20 3 Count Weft Yarn Thread 1/cm 16 3 16 3 Count

[0033] In addition to the high values of abrasion resistance and low tape thickness D in comparison to composite materials, the inventive tape manufactured in this manner had a very good temperature stability (125 C./150 C. according to LV 312), was processable manually and by machine, pliant, and showed no flagging in processing.

TABLE-US-00003 TABLE 3 Basic Data of an Inventive Cable Wrapping Tape (Invention) Compared to a Known PA Fabric Cable Wrapping Tape (Comparison) Property Unit Comparison Invention Carrier Material PA PA Carrier Weight g/m.sup.2 130-250 130-250 (185 5) (185 5) Warp Thread Count 1/cm 17-60 17-60 (20 3) (20 3) Weft Thread Count 1/cm 10-30 10-30 (16 3) (16 3) Adhesive Application g/m.sup.2 95-105 95-105 Tape Thickness D mm 0.27-0.30 0.28-0.32 Mechanical Values Elongation at Break % 25-30 28-35 Breaking Force N/cm 400-500 600-800 Adhesive Force On Steel N/cm 6.0-10.0 6.0-10.0 On Tape Backs N/cm 5.0-9.0 5.0-10.0 Unwind Adhesion N/19 mm 2.0-5.0 2.0-5.0 Flagging No Flagging No Flagging 30 min, 24 h Abrasion Resistance with Strokes 6600-8000 11000-15500 5 mm Mandrel

[0034] In Table 3 above, the basic data of an inventive cable wrapping tape (Invention column) with its possible variation ranges andspecified in parenthesespreferred variation ranges are compared to those of a known PA fabric cable wrapping tape (Comparison column) of the aforementioned type.

[0035] Determination of the specified technical parameters was effected here according to the respective common standards: DIN EN ISO 2286-1 (1998-07) for the specific weight of carrier 1, DIN EN 1942 (2008-06) for the thickness D, DIN EN 14410 (2003-06) for the mechanical values, DIN EN 1939 (2003-12) for the adhesive force, and DIN EN 1944 (1996-04) for the unwind adhesion of the adhesive tape. The flagging behavior and abrasion resistance were determined according to LV 312.

[0036] It is clear from Table 3 that, among other things, the property changes explained above with respect to the tensile strength of the yarn 3a, 3b (Breaking force cell), where said property changes occur with increasing twisting of a yarn 3a, 3b, are also valid for the abrasion resistance of the yarn 3a, 3b, although no direct causal relationship exists between these two properties and these properties are determined by other methods of measurement. The inventively achievable abrasion resistance surprisingly increases up to about two abrasion classes (class F or G) higher than with the known adhesive tape (class E), which was already extremely high compared to previously known PET tapes with low tape thickness D.

[0037] The foregoing description of various embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Numerous modifications or variations are possible in light of the above teachings. The embodiments discussed were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled. For example, the tabular listing of the inventively preferred parameters in Tables 2 and 3 does not mean that the ranges and/or values contained in a cell are disclosed necessarily only in connection with the ranges and/or values in a cell or all cells, or that they must be changed simultaneously therewith.