Unknown

Abstract

Adhesive tapes, especially for lengthwise jacketing of elongate items such as cable harnesses in motor vehicles and methods for producing and using said adhesive tapes are disclosed. Each adhesive tape comprises a carrier having a width B.sub.T based on the cross direction and at least one layer of adhesive applied on a bottom side of the carrier, wherein the adhesive layer bearing a second carrier, which has a lower width B.sub.Schutz than the width B.sub.T of the first carrier. The first carrier with the adhesive layer protrudes two-sidedly relative to the side edges of the second carrier, where the first protrusion has a width of B.sub.Start and the second protrusion has a width of B.sub.Hülle. The first carrier is a woven fabric having a basis weight of 50 to 200 g/m.sup.2 and the second carrier is a textile carrier having a basis weight of 300 to 1000 g/m.sup.2.

Claims

1. An adhesive tape comprising: a first carrier having a top side and a bottom side, wherein the first carrier, based on the cross direction, has a width B.sub.T; and at least one layer of adhesive applied on the bottom side of the first carrier, the at least one layer of adhesive bearing a second carrier, that has a lower width B.sub.Schutz than the width B.sub.T of the first carrier, wherein first carrier with the at least one layer of adhesive protrudes two-sidedly relative to side edges of the second carrier and has a first protrusion having a width of B.sub.Start and a second protrusion having a width of B.sub.Hülle, wherein the first carrier is a woven fabric, the second carrier is a textile carrier selected from the group of drawn-loop spacer knit, formed-loop spacer knit, woven double fabric, flat knit fabric and needle-punched nonwoven fabric, the first carrier has a basis weight of 50 g/m.sup.2 to 200 g/m.sup.2, and the second carrier has a basis weight of 300 to 1000 g/m.sup.2.

2. The adhesive tape according to claim 1, wherein at least one marker line extending in longitudinal direction on the top side of the first carrier is arranged above longitudinal edges of the second carrier.

3. The adhesive tape according to claim 1, wherein B.sub.Start has a width of 3 to 20 mm, B.sub.Schutz has a width of 50 to 200 mm or a width of 100 to 400 mm, if the item is to be wrapped with two plies, and/or B.sub.Hülle has a width of 50 to 200 mm.

4. The adhesive tape according to claim 1, wherein construction of the woven fabric is as follows: the warp thread count is 10 to 60/cm; the weft thread count is 10 to 40/cm; the warp threads possess a yarn weight between 40 and 500 dtex; and the weft threads possess a yarn weight between 40 and 660 dtex.

5. The adhesive tape according to claim 1, wherein the first carrier has a colouration.

6. The adhesive tape according to claim 1, wherein the adhesive coatweight, based on the carrier area, is between 40 and 160 g/m.sup.2.

7. The adhesive tape according to claim 1, wherein a thickness of the second carrier is not more than 4000 μm and/or the second carrier has a basis weight of 350 g/m.sup.2 to 850 g/m.sup.2.

8. The adhesive tape according claim 1, wherein a needle-punched nonwoven is used as second carrier.

9. The adhesive tape according to claim 1, wherein an acrylate-based adhesive is used as the adhesive.

10. A method comprising: jacketing an elongate item with the adhesive tape according to claim 1 such that the elongate item is enveloped in an axial direction by the adhesive tape.

11. An elongate item jacketed with the adhesive tape according to claim 1.

12. A vehicle comprising the elongate item according to claim 11.

Description

[0194] The intention of the text below is to illustrate the invention in more detail using a number of figures, without wishing thereby to impose any unnecessary restriction on the invention.

[0195] FIG. 1 shows a method of abrasion measurement,

[0196] FIG. 2 shows a measurement method for noise damping according to the BMW and Ford standards;

[0197] FIG. 3 shows a dropping tower test in accordance with standard VW 60360-3,

[0198] FIG. 4 shows the adhesive tape in a lateral section,

[0199] FIG. 5 shows the adhesive tape, in a somewhat different configuration, in a lateral section,

[0200] FIG. 6 shows a further variant of the adhesive tape in a lateral section, and

[0201] FIG. 7 shows a detail of a cable loom which is composed of a bundle of individual cables and is jacketed with the adhesive tape of the invention.

[0202] The adhesive tape according to FIG. 4 has a first carrier 401 made of woven fabric with a width B.sub.T. On the topside of the first carrier 401 there are two marker lines (marker line start 404, marker line end 405) which are arranged above the long edges of the second carrier 403. Applied over the full area on the bottom side of the first carrier 401 is an adhesive 402. Applied below the adhesive 402 is the second carrier 403, which has a width B.sub.Schutz which is lower than that of the first carrier 401. The second carrier 403 leaves two adhesive stripes free on either side, with the respective widths B.sub.start and B.sub.Hülle.

[0203] The first adhesive stripe is intended for preliminary securement; the second secures the adhesive tape after wrapping.

[0204] If, after the first wrapping, the marker line end 405 lies over the marker line 404, so that the latter is just no longer visible, the user knows that the second carrier 403 has looped the item once completely (360°), and therefore that the adhesive tape matches the diameter of the item to be jacketed (or the width of the second carrier 403 is ideally matched to the periphery of the item to be jacketed).

[0205] FIG. 5 shows an adhesive tape with a somewhat different configuration, in a lateral section. The marker line end 405 is offset to the centre of the second carrier 403. With regular wrapping, this means that the cable loom is initially wrapped once with the second carrier 403 (360°). Since at the same time the distance between the two marker lines 404, 405 corresponds to the width B.sub.Hülle, the cable loom is ultimately wrapped once again by the first carrier 401 (360°). If the marker line end 405 is just no longer visible after wrapping, being masked by the end of the first carrier, the user knows that the adhesive tape is positioned optimally.

[0206] FIG. 6 shows the adhesive tape according to FIG. 4, but with the layer 402 of adhesive not applied over the full area on the first carrier, but instead having two adhesive-free stripes, which are located above the second carrier 403. As a result the adhesive tape becomes more flexible.

[0207] FIG. 7 shows the adhesive tape in another embodiment after the wrapping of various cables 506. The cables 506 are looped completely by one ply of second carrier 503 (360°), and in addition the first carrier 501 loops the cables 506 with a further complete rotation (360°) for the purpose of securement, so producing a surround which meets the requisite properties in relation in particular to the guillotine test.

EXAMPLES

Outline of the Examples

[0208] The adhesive tape of the invention is described below in a preferred embodiment by means of a number of examples A to G, without any intention thereby to subject the invention to any restriction whatsoever.

[0209] In addition, a comparative example V is given, which shows an unsuitable adhesive tape.

[0210] A woven polyethylene terephthalate fabric (fibre linear density 167 dtex, thread count warp 44/cm, thread count weft 25/cm) has an acrylate-based example PSA (pressure-sensitive adhesive) applied to it, to give an adhesive surface weight of 90 g/m.sup.2.

[0211] Alternatively a woven polyamide fabric (fibre linear density 470 dtex, thread count warp 21/cm, thread count weft 21/cm) is used, and has an acrylate-based example PSA applied to it, with a coatweight of 95 g/m.sup.2.

[0212] Various textiles are laminated to the adhesive as second carriers (also called protective textile plies).

[0213] The adhesive tapes are then subjected to the different measurement methods.

[0214] Polyamide density: 1140 g/dm.sup.3 and

[0215] PET density: 1300 to 1400 g/dm.sup.3

TABLE-US-00006 Protective Examples textile ply A B C D Material PET PET PET PET class Material Needlefelt Needlefelt Needlefelt Double-ply type woven fabric Basis     400    600     800    630 weight [g/m.sup.2] Thickness    1680   2650    3450   1420 [μm] Density     238    226     231    443 [g/dm.sup.3] Abrasion    6525 25 460  57 200   8070 5 mm mandrel [double strokes] Damping      15     16      18      4 in [db(A)] Combination of protective textile ply with woven PET fabric adhesive tape Thick-    1880   2840    3640   1630 ness [μm] Abrasion  22 400 64 870  89 560 68 430 5 mm mandrel [double strokes] Damping      14     15      17      4 in [db(A)] Drop tower      25     25      50     50 test [J] Flexural     461    889    1276    671 stiffness in application direction [nnN] Temper-       4      4       4      4 ature class Protective Examples / Counter-example textile ply E F V G Material PA 90 wt % PET PET PA class PET 10 wt % Material Flat knit Formed-loop Nonwoven Flat knit type fabric spacer knit binder- fabric consolidated Basis     875    523     696    260 weight [g/m.sup.2] Thick-    1450   2430     550    680 ness [μm] Density     605    215    1265    382 [g/dm.sup.3] Abrasion  22 980 12 788  86 400   4865 5 mm mandrel [double strokes] Damping in       8    >20       2      6 [db(A)] Combination of protective textile ply with Combination woven PET fabric adhesive tape of protective textile ply with woven PA fabric adhesive tape Thickness    1660   2810     750   1160 [μm] Abrasion 133 200 23 677 124 100 27 652 5 mm mandrel [double strokes] Damping       8    >20       2      7 in [db(A)] Drop tower      25     50       5     50 test [J] Flexural     316    712   >2000    148 stiffness in application direction [nnN] Temper-       3      4       4      3 ature class When the second carrier used is a binder-consolidated nonwoven, described for example in EP 995 783 Al, the result is a relatively stiff but hard adhesive tape, which the skilled person would have expected to be insensitive to impulsive events.

[0216] Surprisingly the opposite is the case.

[0217] Given a comparable thickness, adhesive tapes of this kind show much less protection against impulsive events—in the drop tower test, the surround produced with the adhesive tape suffers fractures at an exposure energy of just 5 J. After the fracture, the lead insulation of the cable may suffer damage.

[0218] Comparative example 1 does offer a high abrasion protection, but the drop tower test destroys the protective sleeve very quickly.

[0219] Needle-punched nonwovens (needlefelts) have a lower density by comparison with woven fabrics. The results in the drop tower test surprisingly show equally high values: with the same values for the protective effect, the protective surround can be produced with a lower weight of material. The high values in the drop tower test are likewise displayed by drawn-loop spacer knits, formed-loop spacer knits and flat knits.

Implementation of the Tests

[0220] Unless expressly stated otherwise, the measurements are carried out under test conditions of 23±1° C. and 50±5% relative humidity.

LIST OF REFERENCE NUMERALS

[0221] 101 Sample holder [0222] 102 Steel mandrel [0223] 103 Test element, sample [0224] 104 Downholder, sample securement [0225] 105 Replaceable steel wire [0226] 106 Applied weight [0227] 107 Cyclical movement [0228] 108 Drive [0229] 201 Frame of test set-up [0230] 202 Aluminium impact plate [0231] 203 Movable round bar [0232] 204 Microphone [0233] 205 Test element, sample [0234] 301 Frame of test set-up [0235] 302 Drop weight [0236] 303 Drop tool T-profile [0237] 304 Test cable [0238] 305 Protective surround, sample [0239] 401 First carrier [0240] 402 Applied adhesive [0241] 403 Second carrier [0242] 404 Marker line start [0243] 405 Marker line end [0244] 501 First carrier [0245] 502 Applied adhesive [0246] 503 Second carrier [0247] 504 Marker line start [0248] 505 Marker line end [0249] 506 Cable