A method of manufacturing a tube of heat-shrinkable multilayer


H01B17/58 - Tubes, sleeves, beads, or bobbins through which the conductor passes (protective tubings for the installation of lines or cables in buildings H02G0003040000)

 

The invention relates to the industrial areas in which you want to retrieve the method of shrink tubing mechanically strong, electrically insulating, corrosion protection or decorative coating of various objects, such as nodes join or terminations of cables, hydraulic pipes and other Problem to be solved by the invention is to obtain coatings with different properties of its outer and inner layers while maintaining high compression layers in between. The problem is solved due to the fact that in the tube heat-shrinkable multilayer obtained by radial expansion of tubular blanks, previously United under the scheme "tube in tube" and intended for the manufacturing method of the heat shrinkage of the surfaces of various objects, the internal diameter of the tubular blanks of each of the upper layer is not less than 10% less than the outer diameter of the tubular workpiece adjacent lower layer. The inner diameter of a tubular piece of each of the upper layer is not more than 30% less than the outer diameter of the tubular workpiece adjacent lower layer. A tubular piece made of polymeric materials or compositions. 2 C. p. F.-ly, 3 ill.

Known single-layer heat-shrinkable tube and the method of their manufacture from various materials, such as polyethylene, polyvinyl chloride, silicone rubber, etc. (Collection of heat Shrink tube and parts made of polymers and their composites. L., 1988).

A disadvantage of the known method of manufacturing heat-shrinkable tubing is the impossibility of simultaneous production of coatings with different properties of its outer and inner layers, and a coherent shrinking several tubes complicates the Assembly of the whole coating, creates a danger of pollution of interlayer surfaces, as well as the risk of damage to the coated object and the coating as a result of repeated heating.

This solution provides a good mix of the two layers. However, the drawback of this solution is the inability to further increase after the shrinking radial compression of the layers in between, and compression of the coated object, as a result of the extrusion of the inner diameter of the upper layer is equal to the outside diameter of the lower layer and, respectively, after the shrinking these diameters are reduced to the same size. Another disadvantage of this solution is the practical impossibility of manufacturing the multilayered structure, in which different layers are made of materials that require substantially different modes of processing that cannot be achieved in the process of co-extrusion or co-vulcanization.

The problem solved by the invention is to obtain coatings with different properties of its outer and inner layers while maintaining high compression layers in between.

The problem is solved due to the fact that the tube is heat-shrinkable multi-layer designed for the fabrication method thermoregulating United on a "tube in tube", when this pre-made tubular workpiece, for which the internal diameter of each of the upper layer is not less than 10% less than the outer diameter of the tubular workpiece adjacent lower layer. The inner diameter of a tubular piece of each of the upper layer is not more than 30% less than the outer diameter of the tubular workpiece adjacent lower layer. In addition, a tubular preform can be made from different polymeric materials or compositions.

The technical result from use of the present invention is that the formation of the coating as a result of shrinking of laminated tubes each upper layer tends to decrease its inner diameter toward the center to a value less outer diameter adjacent the lower layer due to the proposed distinction respective sizes of tubular workpieces. As a consequence, increases the inward radial compression of the layers, which contributes to the compaction of the material layers and provides a dense, almost solid connection between them. At the same time increases the overall compression of the coated object, which is especially important when the coating of objects with complex configuration. Aceh sizes of tubular blanks at the level of 10%. The reduction of this difference below a set level reduces the desired beneficial effect. The increase of this difference above a predetermined level in 30% makes the connection of tubular workpieces on a "tube in tube". Themselves tubular workpiece can be made of different polymer materials, for example, compositions based on ethylene propylene diene monomer and a silicone rubber or of different compositions based on ethylene-propylene rubber.

Due to the foregoing provides the multilayer coating in which the individual layers can have different color and/or mechanical, electrical and other properties and simultaneously provides a high compression layers in between, and a good compression of the coated object.

In addition to the above proposed solution has the following related technical effects: 1. When the radial extension of the single-layer thick-walled workpiece increases the risk of local mechanical damage of the workpiece material due to the high differences in the degree of stretching her inner and outer surfaces, whereas tensile proposed multilayer preform having the same total thickness in each layer, the distinction of the degree of RedPrairie material and accordingly, reduces the possibility of formation of local lesions.

2. It is known that multi-layer electrical insulation has a higher dielectric strength compared with a single layer of insulation of equal thickness in the absence of interlayer air inclusions, which is provided by the proposed solution.

The invention is illustrated by drawings, where: Fig.1 shows a cross-section of the original tubular billets to the radial expansion and procurement for the inner layer, b - preparation for the middle layer, in preparation for the upper layer, and Fig. 2 shows the connection of tubular workpieces (Fig 1) on a "tube in tube" of Fig. 3 shows the proposed three-layer heat-shrinkable tube (cross-section).

The method is as follows.

The tubular blanks 1, 2 and 3 are made of polymeric materials or compositions, and for different layers can be selected from different materials or all blanks 1, 2 and 3 can be made of the same material. The internal diameters of the workpieces 2 and 3 is less than the outer diameters respectively of the blanks 1 and 2. To ensure the connection of the tubular blanks 1, 2 and 3 on a "tube in tube" tubular billet lower layers.

Example 1. You must obtain electrically insulating coating zone connect wires of the power cable, which includes a connecting sleeve with an outer diameter of 28-30 mm and two exhaust section of the cable with a diameter of 18-20 mm Accepted that such coverage must have a two-layer construction, and for good fit sleeves and cable sections of the inner layer should have a hardness of 30-40%, and the thickness of 2-2 .5 times less than the thickness of the outer layer.

To obtain a heat-shrinkable tube made of two tubular blanks 1 and 2, made by standard methods of insulating mixtures based on ethylene-propylene rubber. The mixes ensure the tube of heat-shrinkable properties, as well as providing strength (in arbitrary units shore) tubular workpiece 1 - 40-45, and the tubular workpiece 2 - 60-65. The workpiece 1 has an outer diameter of 18 mm and a wall thickness of 2 mm, the workpiece 2 has an internal diameter of 14.4 mm, which is 20% less than the outer diameter of the workpiece 1, and a wall thickness of 5 mm Workpiece 2 partially pre-expanded to increase the inner diameter of up to 19 mm, Then the workpiece 1 is inserted into the workpiece 2 on the "tube in tube", after which the two-ply blank of the second tube has an average inner diameter of 38.5 mm, total average wall thickness of 3.9 mm, a hardness of the inner and outer layers, respectively, 43 and 64 srvc. units on shore. After the shrinking of the tube onto the connecting sleeve and the exhaust sections of the cable is formed smooth, mechanically strong and solid on the outside floor, well-fitting cover the entire area and having a virtually seamless connection layers in between.

Example 2. You must obtain a decorative three-layer colored coating having a stepped construction. To obtain a heat-shrinkable tubing used three tubular blanks 1, 2, 3, manufactured by standard methods of the color (e.g. red, blue, white) mixtures based on ethylene-propylene rubber, giving the tubes heat-shrinkable properties. The workpiece 1 has an outer diameter of 21 mm, wall thickness 3 mm, length 200 mm, the workpiece 2 has an internal diameter of 14.7 mm, which is 30% less than the outer diameter of the workpiece 1, the outer diameter of 19.7 mm and a length of 150 mm, the workpiece 3 has an inner diameter of 17.7 mm, which is 10% less than the outer diameter of the workpiece 2, the outer diameter of 21.7 mm and a length of 100 mm Pre workpiece 2 and "e" partially radially expanded correspondingly to values of the inner diameter 22 and 26 mm, Then you'll find the I on the workpiece 2 on the "tube in tube". After that, the obtained three-layer workpiece radially expanded to increase the inner diameter of 2.5 times. The obtained three-layer heat-shrinkable tube has an average inner diameter of 37.5 mm, the maximum outer diameter (for layer formed by the workpiece 3) 45 mm. After the shrinking of the tube to cover the object, such as a curved metal tube with an outer diameter of 17 mm, is formed smooth tri-color manual floor.

Example 3. You must obtain a two-layer dielectric coating having an inner layer of insulating mixture on the basis of silicone rubber, and an outer layer of insulating mixture based on ethylene-propylene rubber. This decision significantly expands the ability of directional selection electrical and mechanical properties of the pavement due to the combination of two layers of different chemical composition materials. To obtain a heat-shrinkable tubing used two tubular blanks 1 and 2, made by standard methods of insulating compounds based on silicone (preparation 1) and ethylene propylene diene monomer (preparation 2) rubbers. The mixes ensure the heat-shrinkable tube St is the internal diameter of 11 mm, which is 15% less than the outer diameter of the workpiece 1, and a wall thickness of 5 mm Workpiece 2 partially pre-expanded to increase the inner diameter up to 14 mm and is put on the workpiece 1 on the "tube in tube". The resulting two-ply blank is radially expanded to increase the inner diameter of 1.9-2 times. The obtained heat-shrinkable tubing has an average internal diameter of 20 mm and an average wall thickness of 4 mm After heat shrinkage of the obtained tube on the layout of the node connecting two lengths of cable (with dimensions of 13-14 and 17-18 mm) is formed smooth, mechanically strong, monolithic floor, well-fitting layout of the connection node.

Claims

1. A method of manufacturing a tube of heat-shrinkable multi-layer, which is made of a tubular piece, produce radial expansion of a tubular piece of each of the upper layer, connect the workpiece on a “tube in tube” and then produce a radial expansion of the obtained multilayer tube, characterized in that the tubular workpiece of each upper layer is carried out so that its inner diameter is not less than 10% less than the outer diameter of the tubular zagotovka do so, that its inner diameter is not more than 30% less than the outer diameter of the tubular workpiece adjacent lower layer.

3. The method according to p. 1 or 2, characterized in that the tubular piece made of polymeric materials or compositions.

 

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