CN111834040A

CN111834040A - Filling strip for cable and preparation method thereof

Info

Publication number: CN111834040A
Application number: CN202010808554.XA
Authority: CN
Inventors: 缪武杰; 缪小平; 周金玉; 范汉刚
Original assignee: Wuxi Henglong Cable Material Co ltd
Current assignee: Wuxi Henglong Cable Material Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-10-27

Abstract

The invention provides a filler strip for a cable and a preparation method thereof, wherein the filler strip comprises a foaming material substrate, the foaming material substrate is provided with a first attaching surface, a second attaching surface and an outer supporting surface, the first attaching surface is arranged to be supported by a wire core unit of the cable, the outer supporting surface is abutted to a coating layer which coats a plurality of wire core units from the outside, and the section of the outer supporting surface is arc-shaped; the foaming material substrate is of an axisymmetric structure, and the first attaching surface and the second attaching surface are symmetrical; in the first binding surface, the second binding surface and the outer supporting surface, at least the outer supporting surface is provided with a skin layer. The skin layer is preferably a plastic skin layer. The filling strip for the cable can greatly reduce materials, save economic cost, reduce environmental pollution and reduce the weight of the cable.

Description

Filling strip for cable and preparation method thereof

Technical Field

The invention relates to the technical field of cables, in particular to a filling strip for a cable for the cable and a preparation method thereof.

Background

The cable is used for transmitting electricity (magnetic) energy, information wire rod product, it is electron, the most commonly used transmission medium in the electrified field, it mainly comprises the sinle silk of many coating insulation layer's conductive metal silk (or alloy silk), and at the sinle silk skin that the combination was arranged together around covering other functional layers, for example electromagnetic shield, the coating, fire prevention insulating layer, the protective layer, armor and outer jacket etc. form the main part of cable, and fill filler material between the sinle silk, thereby realize that many strand core group is around the outside coating of covering, fire prevention insulating layer, when the shielding layer, guarantee the roundness and the concentricity of cable, avoid the friction between the sinle silk. If no filling material is added, in the production process of the outer sheath, the coating layer and the shielding layer, the thickness is not uniform due to the fact that cabling is not round, or the cable structure is poor in support and unstable in structure, and the cable core is easily damaged under the influence of external force.

Existing filler materials typically include filler ropes and filler strips. The filling strip has the advantages of large-scale production, convenience in filling and the like, is widely applied and can be used from a common power cable to a submarine cable. However, the existing filler strip is generally processed and formed into a solid filler strip by using a recycled material secondary process, for example, PE, nylon and waste mixed materials, the solid filler strip has a large smell and is harmful to the environment, the environment pollution is serious due to the fact that the filler strip contains more harmful substances, a solid structure is adopted, the weight of the whole cable is greatly increased due to the fact that the single weight is large, the cost and the construction amount are increased invisibly, and the solid filler strip is undesirable in engineering.

Prior art documents:

chinese patent documents: 2015210052958 filling strip for cable

Chinese patent documents: 2018102506209 novel submarine cable filling assembly

Chinese patent documents: 2015201347777 Special-shaped filling rope for optical cable or electric cable or photoelectric composite cable

Disclosure of Invention

The invention aims to provide a novel filling strip for a cable, aiming at solving the problems of heavy weight and more materials of a cable filling rope in the prior art, so that the materials and the weight of the filling rope are reduced on the whole.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a filler strip for a cable comprises a foam material substrate, wherein the foam material substrate is provided with a first attaching surface, a second attaching surface and an outer supporting surface, the first attaching surface is arranged to be supported by a wire core unit of the cable, the outer supporting surface is abutted with a coating layer for coating a plurality of wire core units from the outside, and the cross section of the outer supporting surface is arc-shaped;

the foam material substrate is of an axisymmetric structure, and the first attaching surface and the second attaching surface are symmetrical;

in the first binding surface, the second binding surface and the outer supporting surface, at least the outer supporting surface is provided with a skin layer.

By adopting the filling strip, the foaming material substrate is taken as the main body of the filling strip, the problem of single body weight of solid filling caused by adopting traditional PE, nylon and waste mixed materials is avoided, and meanwhile, the foaming material can be adopted to achieve the purposes of reducing materials, saving energy, protecting environment and reducing pollution to the environment. Simultaneously, the basement that adopts expanded material is softer, for the effect that plays the reinforcing and support, sets up the skin layer on outer holding surface for when filling the sinle silk subassembly and going on outer cladding, can play the supporting role of reinforcing, avoid, reduce the problem that the cabling is not round and leads to the thickness inequality.

Preferably, the thickness of the skin layer ranges from: 0.1-3 mm. The skin layer is a plastic or rubber skin layer.

Preferably, the arc of the cross section of the outer supporting surface is distributed continuously or in a discontinuous two-stage manner, or in a discontinuous periodic manner.

Preferably, at least one supporting strip is further arranged in the foaming material substrate and is positioned between the first abutting surface and the outer supporting surface and/or between the second abutting surface and the outer supporting surface. The supporting bars are mutually parallel and/or cross-distributed.

According to the disclosure of the invention, a preparation method of the filling strip for the cable is also provided, which comprises the following steps:

providing a foaming material substrate with an axisymmetric structure, wherein the foaming material substrate is provided with a first attaching surface, a second attaching surface and an outer supporting surface, the first attaching surface is arranged to be supported by the core units of the cable, the outer supporting surface is abutted to a coating layer which coats the plurality of core units from the outside, and the cross section of the outer supporting surface is arc-shaped; the foaming material substrate is formed by symmetrical first attaching surface and second attaching surface;

and covering the outer supporting surface to form a covering layer with the thickness of 0.1-3mm, wherein the covering material is plastic or rubber.

Preferably, the skin covering process adopts one of a co-extrusion process, a glue coating process, a thermal shrinkage film coating and heating shrinkage process and a drawing and glue injection molding process.

It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural view of a filler strip according to an exemplary embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a filler strip according to a second embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a filler strip according to a third embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a filler strip according to a fourth embodiment of the present invention.

Fig. 5 is a schematic structural view of a filler strip according to a fifth embodiment of the present invention.

Fig. 6 is a schematic perspective view of a filler strip according to a first embodiment of the present invention.

Detailed Description

In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.

In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.

In combination with the figure, the invention provides a filling strip for a cable using a foaming material, which adopts the foaming material as a main body of the filling strip, and a skin layer, such as a plastic skin or a rubber skin, is arranged on an outer coating surface of the filling strip, so that when the filling strip is filled into a wire core assembly and is coated externally, a reinforced supporting effect can be achieved, and the problem of uneven thickness caused by non-round cabling is avoided and reduced.

Fig. 1 shows a first embodiment of the filler strip for cables according to the present invention, in which the filler strip 100 has a fan-shaped cross section and a foam base 101, which is formed of foam and has a fan-shaped cross section as shown in the drawing. The size of the foam substrate 101 can be selected and determined according to the size of the core assembly of the cable and the size of the cabled cable. For example, the thickness of the filler strip is integrally controlled to be 0.5-5mm, so that the filler strip can be applied to various occasions such as common cables, special cables, submarine cables and the like.

It should be understood that the aforementioned core assembly of the present invention refers to a conductive unit made of metal, alloy or other conductive material having electrical conduction and/or electrical communication functions, and in some embodiments, in the cable, such core assembly may be a plurality of single cores having electrical conduction functions, for example, for realizing electrical energy transmission, a plurality of single cores having electrical communication functions, for realizing electrical signal transmission, or a double-core cabling with two cores.

As shown in fig. 1, the foam base 101 has a first abutting surface 102 provided to be supported by the core units of the cable, a second abutting surface 103, and an outer supporting surface 104 abutting against a coating layer that coats the plurality of core units from the outside. The coating layer here is, for example, a polyester tape outer covering layer, an electromagnetic shielding layer, an insulating layer, polyvinyl chloride, a polyethylene insulating layer, or the like.

As in the example of fig. 1, the cross-section of the outer bearing surface 104 is curved, in particular continuously curved.

Preferably, the foam material substrate is of an axisymmetric structure, and a rubber foam material or a plastic foam material is adopted. The first abutting surface 102 and the second abutting surface 103 are symmetrical about the symmetry axis to adapt to most of the wire core assemblies with the same size and model.

In the example shown in fig. 1, at least the outer support surface 104 of the first attachment surface 102, the second attachment surface 103 and the outer support surface 104 has a skin layer. Specifically, of the three surfaces, the outer support surface 104 needs to be provided with a skin layer 105 to play a role of reinforcing support when the filling strip is filled into the wire core assembly and is externally coated.

With reference to fig. 1, the filling strip of the above embodiment is adopted, the foamed material substrate is used as the main body of the filling strip, the problem of single body weight of solid filling caused by traditional PE, nylon and waste mixing materials is avoided, and meanwhile, the purposes of reducing material consumption, saving energy, protecting environment and reducing pollution to the environment can be achieved by adopting the foamed material. Simultaneously, the basement that adopts expanded material is softer, for the effect that plays the reinforcing and support, sets up the skin layer on outer holding surface for when filling the sinle silk subassembly and going on outer cladding, can play the supporting role of reinforcing, avoid, reduce the problem that the cabling is not round and leads to the thickness inequality.

Preferably, the skin layer is made of plastic or rubber, and the thickness of the skin layer is controlled within the range of 0.1-3 mm. Particularly preferred is a skin layer of between 0.1 and 2 mm.

With reference to fig. 1, the skin layer is in close contact with and conforms to the outer support surface. In the preparation process, the skin covering process adopts one of a co-extrusion process, a glue coating and cladding process, a thermal shrinkage film coating and heating shrinkage process and a drawing and glue injection molding process.

The following is an exemplary description of a specific skinning process:

(1) co-extrusion: preheating a single-screw extruder, wherein the temperatures of screw sections are respectively as follows: 130-160 degrees for the first section, 160-180 degrees for the second section, 180-210 degrees for the third section, and 170-200 degrees for the T-shaped opening mold, wherein the injection port is arranged in the middle of the T-shaped opening mold, the foaming base material is transversely pulled to pass through the opening mold, and the size of the opening mold is 0.1mm-0.5mm larger than that of the foaming base material. The surface resin can be all general-purpose plastics such as PP, PE, PVC, PS and the like. The co-extrusion process is adapted to all the filler strips.

(2) Gluing and coating process

The foaming base material passes through a traction device and respectively passes through a hot glue coating machine, a rotating rubber roller is utilized, hot melt glue is adhered from a heated glue groove at the temperature of 60-120 ℃ and coated on the outer surface of the cable filling strip, a continuous film supply device is arranged behind the glue groove, and a polymer film is pressed and attached to the surface of the cable filling strip through a compression roller. The surface resin may be a film-formable plastic, elastomer. The process is suitable for the cross sections of the binding surfaces to be continuous cable filling strips, and the cross sections of all the surfaces to be continuous cable filling strips.

(3) Thermal shrinkage film heating shrinkage coating process

The foaming base material is pulled forwards, a rotary winding device is arranged in front of the pulling device, and the rotary winding device is provided with a hot pressing roller auxiliary device, and the temperature of the hot pressing roller is 90-130 ℃. The surface resin may be any heat shrinkable film. The process is suitable for cable filler strips in which the cross-section of all faces is continuous.

(4) Drawing glue injection molding process

The foaming base material is pulled forward and passes through a mold with the length of 0.5-1.5 m, the front end of the mold is provided with a glue injection port, the mold cavity is 0.1-1 mm wider than the base material from the front end 1/4 of the mold length, the temperature of the mold is divided into three or four sections, the temperature of each section is T1, T1+20, T1+ T1+10 or T1, T1+10, T1+20 and T1+10, the temperature of T1 is the first section, and the temperature of T1 is 60-160 ℃. The surface resin can be soft or hard polyurethane, unsaturated polyester resin, phenolic resin, epoxy resin, etc.

Fig. 2-5 illustrate exemplary filler strips for cables according to further embodiments of the present invention. Each having a foam substrate and skin layer similar to the embodiment of fig. 1, but differing from the structure and configuration shown in the embodiment of fig. 1 in that the shape of the outer support surface of the foam substrate in the embodiment of fig. 2-5 is different and there is a corresponding difference in the shape of the skin layer to which it is fitted.

Fig. 2 shows a filler strip 200 according to a second embodiment of the invention, having a foam substrate 201, the foam substrate 201 defining a first abutment surface 202 for abutment with a core unit of the cable, a second abutment surface 203 and an outer support surface 204 for abutment with a cladding layer externally covering a plurality of core units. Wherein, the cross-sectional shape of the outer supporting surface 204 is an arc shape which is discontinuously distributed in two segments. The foam substrate 201 is also of an axisymmetric configuration. The first abutting surface 202 and the second abutting surface 203 are symmetrically arranged.

The outer supporting surface 204 of the foam material substrate 201 is provided with a skin layer 205 to play a role of reinforcing support when the filling strip is filled in the wire core assembly and is coated outside, and the material, the thickness and the process can adopt the same design as the embodiment of fig. 1.

As shown in fig. 2, the middle position of the cross section of the outer support surface 204 has a first recess 206, the first recess 206 preferably being symmetrical about the axis of symmetry.

Thus, in this embodiment, the skin layer 205 can be tightly attached to and fit with the outer support surface 204.

Fig. 3 shows a filler strip 300 of a third embodiment of the invention, having a foam substrate 301. The foam base 301 defines a first abutment surface 302 for abutment with a core unit of the cable, a second abutment surface 303 and an outer abutment surface 304 for abutment with a cladding layer externally cladding the plurality of core units. The cross-sectional shape of the outer support surface 304 is an arc shape that is continuously distributed. The foam substrate 301 is also of axisymmetric construction. The first abutting surface 302 and the second abutting surface 303 are symmetrically arranged. A reinforcing skin layer 305 is provided on the outer support surface 304 of the foam substrate 301.

The difference from the embodiment shown in fig. 1 is that the foam material substrate 301 of the filler strip of the embodiment of fig. 3 further has a second recess 306 between the first abutting surface 302 and the second abutting surface 303, which is in an inverted V shape. The second recess 306 is symmetrical about the axis of symmetry. In other embodiments, the second recess 306 in the embodiment of fig. 3 may also be shaped like a circular arc, a trapezoid, etc.

Fig. 4 shows a filler strip 400 of a fourth embodiment of the invention, similar to the example of fig. 2, having a foam substrate 401, the foam substrate 401 defining a first abutment surface 402 for abutment with a core element of the cable, a second abutment surface 403 and an outer support surface 404 for abutment with a cladding layer externally covering a plurality of core elements. The foam substrate 401 is also an axisymmetric structure. The first abutting surface 402 is disposed symmetrically to the second abutting surface 403. A reinforcing skin layer 405 is provided on the outer support surface 404 of the foam substrate 401.

In contrast to the embodiment shown in fig. 2, the arc shape of the cross section of the outer support surface 404 is intermittently periodic and is arc-shaped as a whole.

Fig. 5 shows a filler strip 500 of a fifth embodiment of the invention, similar to the embodiment shown in fig. 1, having a foam substrate 501, the foam substrate 501 defining a first abutment surface 502 for abutment with a core unit of the cable, a second abutment surface 503, and an outer support surface 504 for abutment with a cladding layer externally cladding a plurality of core units. The foam substrate 501 is also of an axisymmetric configuration. The first abutting surface 502 is disposed symmetrically to the second abutting surface 503.

A reinforcing skin layer 505 is provided on the outer support surface 504 of the foam substrate 501.

The difference between the two embodiments of fig. 1 is that a protrusion, preferably in a V shape, is further disposed between the first abutting surface 502 and the second abutting surface 503 of the bottom of the foam substrate to perform the function of reinforcing the support.

The thickness of the entire filler strip is further reduced in the example of fig. 5, reducing the thickness of a portion of its foam base to 0.2-0.5 mm.

In the example shown in fig. 2-5, compared with the example shown in fig. 1, the material consumption is further greatly reduced, the economic cost is saved, the environmental pollution is reduced, and the weight of the cable is reduced.

In an optional example, at least one supporting bar can be further arranged in the foam material substrate and is positioned between the first abutting surface and the outer supporting surface and/or between the second abutting surface and the outer supporting surface, so that the effect of reinforcing and supporting is realized, and the condition that cabling is not round in the outer coating process is avoided.

Preferably, the plurality of supporting bars are distributed in parallel and/or crossed with each other.

According to the disclosed embodiment of the invention, a preparation method of the filling strip for the cable is further provided, which comprises the following steps:

and covering the outer supporting surface to form a covering layer with the thickness of 0.1-2mm, wherein the covering material is plastic or rubber.

Wherein, the skin material is polyethylene or polypropylene.

The foaming material substrate is a rubber foaming material or a plastic foaming material.

The cable prepared by the invention takes a three-core and six-core wire core assembly as an example for cable stranding, the size of the filling strip is determined according to the size of a single core, the filling strip shown in figures 1-5 of the invention is used for filling, the concentricity and complete roundness requirements meeting the performance requirements can be realized, the weight of the traditional solid plastic/mixed material filling is obviously reduced, the material cost is reduced, and the weight is reduced by more than 20 percent on the premise of realizing the performance of equivalent support cabling by taking a one-ton cabled cable as an example.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A filler strip for a cable, comprising a foam substrate having a first abutment surface arranged to abut a core unit of the cable, a second abutment surface and an outer support surface abutting a coating layer externally coating a plurality of core units, the outer support surface having an arc-shaped cross-section;

2. The filler strip for a cable of claim 1, wherein the skin layer has a thickness in the range of: 0.1-3 mm.

3. The filler strip for a cable of claim 1 wherein the skin layer is a plastic or rubber skin layer.

4. The filler strip for a cable of claim 1 wherein the skin layer conforms closely to and conforms to the outer support surface.

5. The filler strip for a cable of claim 1 wherein the outer support surface has a continuous arcuate cross-section.

6. The filler strip for cables as claimed in claim 1, wherein the arc of the cross-section of the outer support surface is interrupted in two segments.

7. The filler strip for cables as claimed in claim 1, wherein the arc shape of the cross section of the outer support surface is intermittently periodically distributed.

8. The filler strip for a cable of any one of claims 1 to 7 wherein the foam base further comprises at least one support strip disposed therein between the first abutment surface and the outer support surface and/or between the second abutment surface and the outer support surface.

9. The filler strip for cables as claimed in claim 8, wherein a plurality of said support strips are arranged parallel and/or cross to each other.

10. The filler strip for a cable of claim 1, wherein the foam base is a rubber foam or a plastic foam.

11. A preparation method of a filling strip for cables is characterized by comprising the following steps:

12. The method of manufacturing a filler strip for a cable according to claim 11, wherein the skin material is a polyolefin-based polymer.

13. The method of manufacturing a filler strip for cables as claimed in claim 11, wherein the filler strip is polyethylene or polypropylene.

14. The method for preparing the filler strip for the cable according to claim 11, wherein the skin process adopts one of a co-extrusion process, a glue coating process, a heat shrinkage film coating and heating shrinkage process, and a drawing and glue injection molding process.