DE3940698C1 - Water and gas proofing definite lengths of wiring - applying 2 layered tape having room temp. adhesive on side facing leads and heat-melting adhesive on outer layer - Google Patents

Abstract

The wiring system with a number of leads (1) has a defined regim is made lonitudinally water and gas-tight by positioning the leads in a section of the wiring system on a double-layer strip. An inner layer (5) is then adhesive at room temp. An outer layer (6) is of hot-melt adhesive such that the wires are parallel to each other with their axes perpendicular to the longitudinal axis of the strip, in at least one layer over the periphery of a circular support of, e.g. polyurethane foam (3). A hose section (7) is passed over the section and is heat-shrunk over it. ADVANTAGE - Sections of more than 30-40 leads can be sealed without damage to insulation.

Description

In the unpublished DE-OS 38 09 167 of the An Notifier is already a procedure and a kit for Manufacture of defined longitudinal watertight and longitudinal gas-tight areas in a variety of veins pointing wiring system described.

DE 36 31 769 describes a method for forming a longitudinally watertight section in a predetermined range of a multi-core wiring system known in which the individual conductors of the wiring systems (wiring harnesses) at the longitudinal water seal around a solid plastic body can be arranged, the Plastic body as round or profile material with outside the longitudinal ribs or grooves. This plastic body consists of a heat treatment to a ver Larger cross-sectional shape swelling plastic, included tend a thermoplastic hot melt adhesive, which when heated melts, foams and forms closed pores, whereby this material sealing in all gaps between the one penetrates individual conductors of the conductor system.

DE 39 16 510 A1 describes a cable or wire tie knows, which has a substantially cylindrical body points to the extent of several, open to the outside and pa parallel spring clamps are formed. On these spring clips will combine them into a bundle the cable or conductor is pushed on and thereby held. A single cable is assigned to each spring clip.

In the be in the unpublished DE-OS 38 09 167 be The procedures described are the veins of a seal Section of the wiring system on a section a two-layer tape, which is a inner veins sticking at room temperature facing the veins Layer and has an outer hot-melt adhesive layer, with the wires parallel to each other with their longitudinal axes  perpendicular to the longitudinal axis of the two-layer tape the inner band, the two-layer Tape with the veins attached to it to form a winding body rolled up and finally a heat shrinkable Component around the section of the wiring to be sealed systems is shrunk around.

The kit according to the above is not pre-published lichten DE-OS 38 09 167 consists of a section of a two-layer tape, one at room temperature adhesive inner layer and an outer hot melt adhesive has layer, and a portion of a heat shrink component.

For assembly, the double-layer tape is first opened about twice the length of the sum of the diameters of the one loaders that make up the wiring system, abge long. The single cores are then parallel in sequence or in another suitable way in that at room temperature adhesive material embedded under slight pressure tet. This mass sticking at room temperature, preferably a mass of butyl rubber, is plastically deformable  and because of the good adhesion to the veins which the veins hold in the position once specified The remaining free length of the two-layer The tape is then fanned out from above Wiring system section laid and pressed. On the whole is finished with the two-layer tape encased fanned wiring system section wrapped together in a winding body and with an adhesive coated shrink tube section shrunk.

The melt adhesive becomes by the heat supply during the shrinking material of the two-layer tape for flowing brings, and by the shrinkage pressure of the heat shrink this flowable hot melt adhesive material in between the single wires of the wiring system existing cavities pressed so that after solidification of the Hot melt adhesive a defined area of perfect longitudinal waterproofing and longitudinal gas sealing is formed.

The method described above processes a maximum of 35 to 40 individual wires with average wire cross sections of 0.5 to 6.0 mm ² .

Wiring systems are usually processed tet, whose PVC insulating sleeves are one for the Processing necessary short-term temperature resistance of not more than 150 ° C. For this reason in the method described above at Temperatu worked around 200 ° C, depending on the number of wires and Core cross-section the shrinking time is 2.5 to 3 min. By appropriate selection of shrinking times and shrinkage temperatures must be ensured that inside the a large number of cores wound into a roll to flow the hot melt component of the two-layer Band required temperature of about 110 ° C reached becomes.  

However, the wiring systems contain more than 35 to 40 single cores, achieved with shrinking treatment the temperatures of the outermost veins, i.e. those Veins that most intensely to the heat of the shrinking device exposed to values of more than 150 ° C, causing damage to cause the insulating sheaths of these overheated wires can.

A reduction in shrinkage duration with the aim of It is not possible to reduce the risk of the outer wires overheating possible because with reduced shrinkage time inside the into a roll of coiled wiring system (Cable bundle) no longer the required temperatures (about 110 ° C) to melt (flow) the hot glue be enough. A good flow of the However, hot melt adhesive material is required to Seal cavities between the single wires well. For the reason mentioned above, it is also not possible Lich, the temperature of the shrink devices below the to lower temperatures of 200-300 ° C, since this risk of external veins reduced, at the same time but reaching the to flow the hot melt adhesive required temperature of about 110 ° C inside the Cable bundle would be difficult.

The invention is therefore based on the object, a Ver drive and a kit to create a defined longitudinally watertight and longitudinally gas-tight area in one a variety of wiring system create. In particular, the invention aims to to specify a method and a kit by means of which Wiring systems with more than 35 to 40 wires for Establishment of defined sealing points required can be subjected to shrink treatment without that as a result of overheating damage to the insulating sleeve  len of the single wires occur. At the same time, however be sure that the hot melt adhesive material from sealing in all gaps between the single wires as well as between the single wires and the outer back penetrates shrinking component to fill them.

This task is procedurally by that in claim 1 specified procedures solved.

In terms of the device, the one on which the invention is based Task by the kit specified in claim 7 ge solves.

According to the invention, the entirety of the Ab sealing point in the existing wiring system on the surface of a preferably circular Cross-section supporting body arranged, wherein the cores with the help of the In layer of the two-layer tape in the desired Arrangement are recorded. Preferably the through knife of the support body so in terms of the number of Single cores chosen that the total of cores in one single layer side by side around the circumference of the support body can be arranged. If necessary, the Veins of course in more than one layer all around the circumference of the support body can be arranged.

After arranging the wires using the two-layer Tape on the surface of the support body becomes a heat shrinking component, preferably a Heat shrink tubing section to the sealing site shrunk.

The technical fort that can be achieved with the aid of the invention step arises primarily from the fact that the veins in the area of the sealing point not like that  conventional methods to form a winding body what is heating the innermost veins prevents and overheating of the outer veins but that the veins to be heated on the upper area of a circular cross-sectional shape send support body in preferably a single layer are arranged. In the arrangement of the invention Single cores on the outer surface of such a support body and parallel to its longitudinal axis is during the Heat treatment to melt the hot melt adhesive and shrinking back the shrink tube only that arranged on the surface of said support body, preferably single-layer, thin layer of veins, through to warm. Such a comparatively thin layer leaves warm up quickly and uniformly without local Overheating is to be feared.

Since when executing the method according to the invention as well when using the kit according to the invention all wires with the surrounding hot melt material of the two layered tape on the outer surface of the support body Pers are not arranged as in the conventional How a relatively solid copper cable works in Form of a winding body to be warmed, which is because of Thermal conductivity of copper requires a lot of energy and time needed, but is by arranging the veins around around the circumference of a support body opens up the possibility the entirety of the veins under essentially identical Warm conditions so that there are no areas in which local overheating or which inadequate suitable temperatures for the flow of hot melt adhesive occur.

Essentially, with the help of the invention, the follow achieved the advantages:  

• 1. Since the arranged around the support body Cores of the heat source (present in the shrinking device) To offer a large surface is too warm layer thickness low.
• 2. This small layer thickness can be quickly equal Warm moderate temperature.
• 3. Because the supply of thermal energy to the veins inside very short periods of time, the operating temperature ture of the shrinking devices clearly above that of conventional used operating temperatures of 200-300 ° C increase be used without the temperature of the wire insulation and the hot melt adhesive material rises above 150 ° C.
• 4. With the help of the invention can wire-rich wiring systems with more than 35 to 40 cores within Periods of only 40 to 70 s are sealed the, with working temperatures of the shrinking device from 300-350 ° C can be used.

In general, regardless of whether the sealing point ge veins or many veins, the following white Other advantages can be achieved:

• - There can be wiring systems with a lot more Sealing veins than with the help of conventional Ver driving or the conventional kit, because thanks the present invention itself very large vein do not pay to local overheating outer veins.
• - This leads to wiring systems with few wires Process according to the invention to significantly shorter Shrinking times than the conventional method.  
• - Furthermore, the length of the sealing point, i.e. H. the Length of the section in which the gaps between the veins and between the outer Shrink sleeve gas and watertight ver are closed, can be dimensioned significantly shorter than in the known method, because when executed of the present invention is a swelling of the Hot melt adhesive from the open ends of the shrunk outer shrink tube not required is such. The shortening of the Ab sealing point allows the sealed Wiring system immediately behind the seal place what with regard to the Automotive engineering often exists in a cramped relationship is of great importance.

In contrast to the conventional method, this requires shrinking outer shrinking component (shrink hose) not necessarily an inner one Hot melt adhesive coating.

The support body of the present invention can be many be designed in different ways. By a a suitable shape of the support body can be adapted Solution can be achieved, the later attachment and / or Positioning the sealing point in wall openings or the like.

Preferred embodiments are in the subclaims of the method according to the invention or of the invention specified kit.

The invention is described below with reference to exemplary embodiments play and described with reference to the drawing  ben. In this shows:

Fig. 1 is a perspective view of a fiction, designed according to the sealing point, in a more than 40 wires having wiring system

Fig. 2 shows a cross section through the sealing point along the line AA in Fig. 2 and

Fig. 3 to 7 examples of adjustments made by suitable shaping of the support body to the later seat of the sealing points in Wandungsdurchläs sen.

Fig. 1 shows a plurality (45) of insulated wires 1 of a cable system referred to as a wiring system in the context of the present invention. These wires 1 are arranged parallel to each other and arranged in the area of a sealing point 2 from around the circumference of a support body with a circular cross-sectional shape. The support body is shown in cross section in FIG. 2 and is designated by reference number 3 . Further, FIG. 1 shows a portion of a two-layer belt 4 which consists of a veins 1 facing layer 5, beispielswei se of butyl rubber, and this layer 5 supporting layer 6 is made of hot-melt adhesive.

In order to arrive at the arrangement shown in Fig. 1, the in the area of the sealing point 2 are first fanned out to a position of substantially parallel to one another veins. In this fanned position, the single wires are embedded under light pressure into the inner adhesive layer 5 of the two-layer tape 4 . The layer 5 is preferably made of butyl rubber, since such a rubber composition is plastically deformable and very well adhesive. Due to the adhesive effect of this inner layer 5 , the wires 1 are held in the desired position. Then the two-layer tape 4 with the wires 1 adhering to it is wound around the circumference of the support body 3 , which is circular in cross-section, so that the wires 1 are arranged in the previously fixed arrangement distributed over the circumference of the support body. In the arrangement shown in FIG. 1, the wires 1 embedded in the butyl rubber of the inner layer 5 are in contact with the surface of the support body. The hot melt adhesive layer 6 forms the outermost layer of the arrangement shown in FIG. 1.

The structure of the arrangement according to FIG. 1 described above is shown in greater clarity in FIG. 2. Thus, Fig. 2 shows a support body 3, on the surface of the wires 1 abut evenly distributed. It can also be seen in Fig. 2 that the veins 1 are each embedded in the butyl rubber compound of the inner layer 5 of the tape 4 . It can also be seen that the inner layer 5 is carried by the outer hot melt adhesive layer 6 of the tape 4 .

FIG. 2 also shows a shrink tube section 7 , which surrounds the arrangement according to FIG. 1.

The two-layer tape 4 shown in Fig. 1 has a width of about 5.5 cm. The outer shrink tube section 7 has a correspondingly selected width. The width of the layers 5 and 6 is chosen from the point of view of expediency.

The arrangement according to FIGS. 1 and 2 is finally subjected to a heat treatment in order to bring the hot melt adhesive layer 6 to flow and to shrink around the outer shrink tube section 7 around the sealing point 2 . With the help of the flowable hot melt adhesive, all gaps between the wires 1 and between these wires and the surface of the support body 3 as well as between the wires and the outer shrink tube section 7 are completely sealed, so that after the heat treatment and solidification of the hot melt adhesive, neither gas nor Liquid can pass along the veins 1 through the sealing point 2 .

In contrast to the conventional method of working, in which a large number of closely coiled wires are sealed with the aid of a hot-melt adhesive which has been caused to flow and a shrink tube section shrunk on from the outside, it is no longer when the method according to the invention is carried out, ie when using the kit according to the invention neces sary to let the hot melt adhesive flow out of the end sections of the sealing point, since even without such a step a perfect longitudinal water seal and longitudinal gas seal in the area of the sealing point 2 is ensured.

In the conventional method, the ge is allowed to flow brought hot melt glue from the ends of the waterproofing step out in order to check by visual inspection can see if the hot melt adhesive has any voids within the Sealing point filled.

The two-layer tape 4 is of a defined width, where the inner layer 5 is preferably made of butyl rubber, whereas the outer layer 6 of this tape 4 consists of a heat-meltable adhesive material. The layers 5 and 6 of the tape 4 adhere to one another, the hot-melt adhesive tape 6 being wider than the butyl rubber tape 5 .

With regard to the respective temperature requirements  can the tape at least in a low temperature version for temperatures of around 85 ° C and in a high temperature be designed from about 105 ° C.

The outer shrink tube section 7 can be provided with an inner layer, not shown, made of a hot glue material.

The support body 3 must be permanently resistant to water and water, such as gasoline, diesel oil and lubricants. Furthermore, the support body 3 should be only slightly heat-absorbing but light and elastic. The tem perature load capacity of the support body must speak at least the temperature load capacity of the insulating sleeves of the wires 1 ent.

The following materials are suitable for the production of the support body 3 :

• - modified, foamed polyurethane with closed pores;
• - cork and elastomers and
• - thermoplastics.

The support body 3 according to the invention are produced by extrusion, injection molding, pressing, molding from natural materials and blow molding.

The outer shape of the support body 3 generally depends on the intended area of use. However, the support body should have at least one section with a circular cross-sectional shape. The diameter of the support body, in particular the diameter in the region of the circular cross-sectional shape, is chosen so that the wires of the wiring system section to be sealed can be arranged evenly spaced around the support body in the manner shown in FIG. 2. Should a one-lay arrangement of the wires around the support body according to the arrangement shown in FIG. 2 not be possible for special reasons, a further layer of wires must be placed over the individual layer shown in FIGS. 1 and 2.

In the longitudinal direction, ie in the longitudinal direction of the wires 1 , the support body 3 can be shaped very differently. As already mentioned, this shape is primarily chosen according to the local conditions prevailing at the place of use. This choice is based on the idea that the shape of the support body should be largely adapted to the later attachment / positioning of the sealing point in wall openings or the like.

Some examples of preferred shapes of the support body 3 are given in FIGS. 3 to 7. Since it is always illustrated in these figures that the shape of the support body 3 and the design of the speak.

Fig. 3 shows a spherical support body 3 , wherein we are any veins are still the two-layer tape Darge.

FIG. 4 shows a support body 3 which widens in diameter in the longitudinal direction from left to right, with a correspondingly designed sealing point. The shape of the support body 3 shown in FIG. 4 is particularly suitable to ensure a good fit of the sealing point, since the support body can be fastened in a bottle neck like a ken bottle. A large number of wires 2 is shown schematically.

According to Fig. 5 of the supporting body 3 has a retracted waist 8 between the left end and the right end thereof. Such a shape enables the fastening or positioning of a sealing point inside a rubber seal, which extends in a form-fitting manner into the waist 8 in the manner illustrated in FIG. 5.

A large number of wires 1 is also shown schematically in FIG. 5.

According to Fig. 6 of the support body 3 has on the left te Be a cylindrical portion of greater diam ser and on the right side from a cylindrical section of smaller diameter. A conical section extends between these two cylindrical sections.

According to Fig. 7, the support body 3 rich has a spherical shape in its same Mitt and in its two end regions a zylinderische shape.

In Figs. 3 to 7 are the attachment sites, which are punched han are essentially Wandungsdurchlässe, designated by the reference numeral 9.

The support bodies 3 can be designed as solid bodies, hollow bodies or as hollow bodies having at least one wall running transversely to the longitudinal axis. A hollow body prevents a penetration and the passage of gas and / or liquid in the longitudinal direction as well as a body having a transverse to the longitudinal axis partition. If, for example, the ball shown in FIG. 3 were solidly formed and the conical support body shown in FIG. 4 was formed like a thimble, the entry and passage of gas or liquid through the support body would be impossible.

If one forms the support body 3 as a hollow body, the interior of such a support body (not shown) can, for example, accommodate a first end of a fastening tube, the second end of which is screwed into a wall.

The preferred field of application for the invention The method and the kit according to the invention is the Vehicle and mechanical engineering, where often the need consists of a variety of electrical conductors standing wiring system through an opening in a Pass through wall. Such a wall can for example the partition between the engine compartment and the passenger cell of an automobile. If in particular liquid like water, along the veins of such a pipe systems flow or crawl, such rivers can liquids in contact with bare connection points, like plugs, get there and extremely annoying short to draw conclusions. With the help of defined Longitudinal watertight and longitudinal gastight sealing points can prevent such an evil. Advantage however, those described in this invention are described Sealing points in the area of wall penetrations or the like provided.

Claims (13)

1. A method for producing a defined longitudinally watertight and longitudinally gas-tight region in a multi-core wiring system, in which the cores of a section of the wiring system are positioned on a section of a two-layer tape which has an inner layer which is adhesive at room temperature and faces the cores and one has an outer layer of hot-melt adhesive, the wires in the area of the sealing section being aligned parallel to one another with their longitudinal axes perpendicular to the longitudinal axis of the two-layer tape on the inner tape, and finally a heat-shrinking component is shrunk around the section of the wiring system to be sealed, characterized in that
that the two-layer tape with the wires adhering to it is wound around the circumference of a support body which is circular in cross section such that the wires are distributed over the circumference of the support body in at least one layer and that the heat-shrinkable component is shrunk onto the section of the wiring system having the support body becomes. 2. The method according to claim 1, characterized in that a cylindrical support body is used. 3. The method according to claim 1, characterized in that a spherical support body is used. 4. The method according to any one of claims 1 to 3, characterized characterized in that a support body is used which in the direction parallel to the longitudinal axes of the  Is gas and liquid tight. 5. The method according to any one of claims 1 to 4, characterized characterized in that a support body is used which is designed as a hollow body. 6. The method according to any one of claims 1 to 5, characterized characterized in that the shape of the support body is chosen so that a later attachment and / or Position the resulting sealing point in Wall passages or the like is favored. 7. kit for producing a defined longitudinally watertight and longitudinally gas-tight area in a multi-core wiring system, with a section of a two-layer tape ( 4 ) which has an inner layer ( 5 ) which is adhesive at room temperature and an outer hot-melt adhesive layer ( 6 ), and with a section of a heat-shrinking component ( 7 ), characterized in that a supporting body ( 3 ) having a circular cross-section is provided, around the circumference of which the wires ( 1 ) of the wiring system can be positioned with the aid of the two-layer tape ( 4 ). 8. Kit according to claim 7, characterized in that the support body ( 3 ) has a substantially cylindrical shape. 9. Kit according to claim 7, characterized in that the support body ( 3 ) has a substantially spherical shape. 10. Kit according to one of claims 7 to 9, characterized in that the support body ( 3 ) in the direction parallel to the longitudinal axes of the wires ( 1 ) is gas and liquid-tight. 11. Kit according to one of the preceding claims 6 to 10, characterized in that the support body ( 3 ) is designed as a hollow body. 12. Kit according to one of the preceding claims, characterized in that the support body ( 3 ) has such a shape that it favors an attachment / positioning of the resulting sealing point in wall openings or the like. 13. Kit according to claim 1, characterized in that the inner layer ( 5 ) of the two-layer tape ( 4 ) which is adhesive at room temperature consists of butyl rubber.