KR100378880B1 - Heat shrinkable sleeve and armature therefor - Google Patents

Abstract

The present invention relates to a heat shrinkable sleeve and its reinforcing material, and the inner heat-resistant polymer, the woven joint, the inner high-temperature polymer, and the low-temperature copolymer by cross-linking all of the layers of the heat recovery when the heat recovery by The inner thermophilic polymer of the woven joint in the outer thermophilic polymer is not allowed to flow even during the hot melting, thereby forming a complete layer, thereby further improving the air injection type internal pressure of the communication cable and the air barrier from the outside. It prevents the occurrence of burst during heat recovery, and can reduce the overall thickness of the wrap attached to the heat shrinkable sleeve to 1/3 level compared with the conventional product, which can significantly reduce the recovery or shrinkage time during heat recovery. It is an object to provide a sleeve and its reinforcement. The heat-shrinkable sleeve reinforcement of the present invention is coated with an emulsion zone oily or aqueous adhesive (4) 1 to 3 g / m ² on a low-temperature copolymer (3) film, lamination with aluminum foil (5), aluminum foil ( The other side of 5) is finished by coating the emulsion zone copolymer primer 6 with 1-3 g / m ² , and the heat shrinkable sleeve adheres the reinforcement of the heat shrinkable sleeve described above to the high temperature copolymer 1. After applying the adhesive layer 7 is completed.

Description

Heat shrinkable sleeve and its reinforcement {HEAT SHRINKABLE SLEEVE AND ARMATURE THEREFOR}

The present invention relates to a reinforcement of a heat shrinkable sleeve, and more particularly, to a heat shrinkable sleeve for sealing a connection portion of a communication cable and a reinforcement for improving its function.

4 and 5 show a cross-sectional view of the aforementioned conventional heat shrinkable sleeve and reinforcing material to reinforce it. A conventional heat shrinkable sleeve and its reinforcement will be described with reference to FIGS. 4 and 5.

In general, various cables buried underground, including communication cables, are covered with various covering materials to prevent moisture from penetrating into the connection area when connecting the conductors. Finally, the cables are coated with heat shrinkable sleeves and the joint clips After bonding together, it is joined by applying heat with a burner such as a torch lamp.

The heat shrinkable sleeve is largely divided into a single layer type and a double layer type, and the single layer type heat shrinkable sleeve is used for a small communication cable or a simple connection part, and includes a high density polyethylene (HDPE), a medium density polyethylene (MDPE), and a low density polyethylene (LDPE). In addition, carbon black, silicon dioxide, and other additives are mixed with linear low density polyethylene (LLDPE), polypropylene (PP), and the like to form a hot melt sheet and stretched after crosslinking. However, the single layer heat shrinkable sleeve is used. Due to the low heat shrinkage rate and the inability to completely seal the connection of the communication cable from the outside, a multi-layer heat shrinkable sleeve is used for the multi-wire communication cable connection connection.

The multi-layered heat shrinkable sleeve is a mixture of carbon black and a high temperature copolymer having a density of 0.94-0.96 on the front and back surfaces around the woven composite (2), followed by heat melting, extrusion coating, crosslinking, and a low temperature on the inner surface. After coating the polyamide or ethylene vinyl acetate (EVA), which is the adhesive agent (7), the inner surface of the sleeve is placed on the inner surface of the aluminum foil (5) and the low-temperature copolymer (3) in the form of a film or extrusion coating. It is used to cover the adhesive (7) after laminating it again. Using the multi-layer heat shrinkable sleeve can block external disturbance electromagnetic waves in communication, and it has excellent waterproof effect and provides more complete sealing effect on the connection part of communication cable. You will get

Techniques proposed or used for the aforementioned conventional heat-shrinkable sleeves include products having improved retention and impermeability as specified in European Patent No. 112390 and thicknesses of 10 to 25 μm as specified in British Patent No. 1604379. The product applied with the thin metal sheet has a factor which inhibits the shrinkage of the heat shrinkable sleeve due to the thickness of the metal sheet and can be used for the polymeric matrix disclosed in European Patent No. 116393 and the heat shrinkable property of British Patent Publication No. 2075991. The sealing effect of the communication cable connection by the adhesive using the inner surface of the sleeve, that is, the heat shrinkable sleeve using polyamide and EVA resin was not perfect. In addition, conventional products such as heat-resilient products of Korean Patent Publication No. 96-753 and reinforcement of sleeves for connection connection sealing of heat-shrinkable communication cables, etc., are heated with a polymeric material (1) disposed on the outer side of the woven fabric (2). In order to prevent the physical properties of the polymer from being deteriorated or moved by the torch, in particular, the crosslinking is preferable, and the polymeric material 1a disposed inside is not crosslinked so that it can flow during heat recovery and bind to adjacent reinforcing layers. It was preferable.

In addition, it is said that it is preferable that the uncrosslinked polymeric material 1a disposed inside and the molten material layer between the fabric and the reinforcing layer have a thickness of 20 to 30 µm. The reinforcement layer may be a single layer or may include two or more layers of material, for example, a mylase or nylon layer attached to one or both sides of a metal layer such as aluminum.

In summary, the heat-shrinkable sleeve, the non-crosslinked polymeric material (1a) during heat recovery because the polymeric material (1a) of the inner layer of the woven fabric (2) is not crosslinked, the reinforcing layer (3a, 4, 5, 8) to improve the binding force.

However, the conventional heat shrinkable sleeve as described above has the following problems.

That is, the conventional heat shrinkable sleeve is a separation process is carried out by performing only the polymeric material outside the heat shrinkable sleeve during crosslinking, the number of bonding layers of the reinforcing material is 8, the low density copolymer film and polyester in the manufacturing process After that, all the processes are made of aluminum adhesive with urethane adhesive, low density copolymer film extrusion coating, Ethylene-Acylic Acid Co-polymer (EAA) copolymer film must be extruded, and the overall thickness of the product Is thick with 100 ~ 105㎛, and in the method of attaching to the sleeve, it is heat-melted with a high temperature copolymer after corona treatment to bond with the wrap, and the copolymer of linear low density polyethylene and EAA ball by filming or extrusion to a thickness of 30 ~ 40 ㎛ a separate bonding step (700 g / m ²⁾ is composed of That will, that will be a rupture of the sleeve caused by heat during torch operation.

In addition, the wrap used as a reinforcing material in a conventional heat shrink sleeve is dried by laminating (adhesive) a polyester film and a polyester film with a urethane adhesive (4) using a urethane adhesive (4) for 24 to 48 hours at 40 to 50 ° C. Next, after bonding the aluminum (5) foil with the urethane adhesive (4) on the polyester (8) side, the product re-maturated at 40-50 ° C. for 24 to 48 hours was co-extruded with LLDPE and EAA copolymer materials to obtain a urethane adhesive. After bonding again, it has a problem that it takes a cumbersome process to make the EAA layer and the polyamide adhesive layer adhere to it under the same conditions, and requires a lot of manufacturing time and manufacturing cost, and produces a wrap for reinforcement in a conventional heat shrink sleeve. If you have a problem that takes only three to four days of ripening time.

Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a heat shrinkable sleeve for sealing a connection portion of a communication cable and a reinforcement for improving its function.

More specifically, when heat-restored by crosslinking all of the outer thermophilic polymer, the woven joint, the inner thermophilic polymer, and the low-temperature copolymer layer, the woven binder may be formed in the inner and outer thermophilic polymer around the woven joint. By preventing the inner high-temperature polymer from flowing down during the hot melting, it can form a complete layer to further increase the internal pressure of the communication cable and the air barrier from the outside, and prevent the occurrence of burst during heat recovery. The purpose of the present invention is to provide a reinforcing material for a heat shrinkable sleeve that can reduce the overall thickness of the wrap attached to the heat shrinkable sleeve to 1/3 as compared to a conventional product and can significantly reduce the restoration or shrinkage time during heat restoration. It is.

The reinforcing material of the heat-shrinkable sleeve of the present invention for achieving the above object is a reinforcing material for reinforcing the function of the sleeve for heat-shrink-bonding the connecting portion of the communication cable, the low-temperature copolymer (3), emulsion zone oil or water-based adhesive ( 4), the aluminum thin film 5 and the emulsion zone copolymer primer 6 are laminated in this order.

The emulsion zone oily or aqueous adhesive 4 is preferably coated with a thickness of 0.5 ~ 1㎛, preferably urethane.

The emulsion zone copolymer primer 6 is preferably coated with a thickness of 0.5 ~ 1㎛.

In addition, the heat shrinkable sleeve of the present invention is a heat shrinkable sleeve for heat shrink-bonding the connecting portion of the communication cable, the high temperature polymer (1), woven composite (2), high temperature polymer (1), low temperature copolymer ( 3), the emulsion zone oily or aqueous adhesive (4), the aluminum thin film (5), the emulsion zone copolymer primer (6), the low temperature adhesive (7) is characterized in that laminated in order.

It is preferred that the high temperature polymer (1), the woven fabric (2), the high temperature polymer (1), and the low temperature copolymer (3) be crosslinked.

1 is a cross-sectional view of the reinforcing material for heat shrinkable sleeve according to the present invention.

2 is a cross-sectional view of a heat shrinkable sleeve according to the present invention.

3 is a cross-sectional view after the heat shrink by applying the heat shrinkable sleeve according to the present invention to a communication cable.

4 is a cross-sectional view of a conventional heat shrinkable reinforcing sleeve.

5 is a cross-sectional view of a conventional heat shrinkable sleeve.

Explanation of symbols on the main parts of the drawings

1 high temperature polymer 2 woven fabric

3: LLDPE 4: Urethane Adhesive

5: aluminum foil 6: emulsion zone copolymer primer

7: low temperature adhesive 8: polyester

9: LLDPE 10: EAA

11: communication cable

Hereinafter, with reference to the accompanying drawings will be described the present invention.

1 is a cross-sectional view of the reinforcement of the heat-shrinkable sleeve of the present invention, Figure 2 is a cross-sectional view of the heat shrinkable sleeve including the reinforcement in FIG. As shown in the drawing, the heat-shrinkable sleeve reinforcement of the present invention is coated with an emulsion-based oil or water-based adhesive (4) at 1 to 3 g / m ² (thickness 0.5 to 1 μm) on a low temperature copolymer (3) film. Then, the laminate is laminated with the aluminum foil 5, and the other surface of the aluminum foil 5 is coated with 1 to 3 g / m ² (thickness of 0.5 to 1 μm) of the emulsion zone copolymer primer 6, thereby completing.

The heat-shrinkable sleeve of the present invention has a low temperature property in which the polymeric material (1) disposed on the outside is hot melt applied to the woven composite (2) and then the polymeric polymer (1) inside the woven composite (2). The film of the copolymer material (3) was coated with an emulsion oil-based or water-based adhesive (4) at 1 to 3 g / m ² (thickness of 0.5 to 1 μm) to the top surface of the aluminum foil (5) laminated with the aluminum foil (5). It is completed by coating the emulsion zone copolymer primer 6 with 1 to 3 g / m ² (thickness 0.5 to 1 μm) and applying the adhesive 7 to the emulsion zone copolymer primer 6. That is, the reinforcing material of the above-mentioned heat shrinkable sleeve is adhered to the high temperature copolymer 1a, and then the adhesive layer 7 is applied.

The reinforcing material for heat shrinkable sleeve of the present invention is a low-temperature copolymer LLDPE film (3) by bonding the aluminum foil surface (5) with a urethane adhesive (4) to coat the emulsion zone copolymer primer agent (6) on the aluminum foil surface (5) It is completed by coating with a roller 1 to 3 g / m ² (coating thickness 0.5 to 1 μm) and adhering to the polyamide adhesive 7.

In particular, the conventional heat-shrinkable sleeve was bonded to the surface of the EAA film surface 10 by applying a high-frequency corona treatment of 20,000 ~ 25,000V to 100 ~ 130 ℃ hot air in order to bond the polyamide adhesive (7), but the present invention The heat shrinkable sleeve has excellent adhesion and no aging to the polyamide adhesive (7) in which the emulsion zone copolymer primer (6) is hot melt extruded as a low temperature adhesive on the aluminum foil surface (5). It can be used without the need.

Table 1 below shows the test results of the physical properties of the reinforcement of the heat-shrinkable sleeve of the present invention.

Content composition unit Measure Remarks Interlayer adhesion (film and aluminum foil) kg / (25mm) Cannot be peeled off The tensile strength MD kg / mm ² 5.75 ASTM D638 CD 5.40 Breathability % 0.0 KSM 3027 Elongation at Break MD % 74.6 ASTM D638 CD 70.8 Adhesion to polymeric materials kg / mm Cannot be peeled off Adhesion with Polyamide kg / mm Cannot be peeled off Heat deflection temperature ℃ 80 ASTM D648

The above physical property test is a measurement value based on the average value of five samples taken, and is a physical property value for examining the adhesion test between the heat shrinkable sleeve sheet and the wrap product.

When the overall composition thickness and heat of the heat-shrinkable sleeve wrap product were tested, the shrinkage time and shrinkage state were tested, and the results shown in Table 2 were obtained.

thickness Shrinkage completion time Internal shape after heat shrink (narrowed gap of aluminum foil) (unit mm) compare 30 8 minutes 17 seconds 0.5-1.0 Wrap shrinks in a circle 50 8 minutes 49 seconds 1.0-1.5 Wrap shrinks in a circle 70 10 minutes 6 seconds 1.5 ~ 2.5 One part of the wrap is unbalanced 100 13 minutes 11 seconds 2.0 ~ 2.7 Wrap forms oval irregular shape 150 17 minutes 32 seconds 3.0 or higher Wrap forms oval irregular shape

The above experiment is the data constructed by the torch method working in a general communication construction by attaching the heat shrinkable sleeve wrap of the product of the present invention to the heat shrink sleeve, and the thickness of the reinforcement was tested according to the thickness of the film bonded to aluminum. .

Experimental results show that the thicker the reinforcement attached to the heat shrink tube, the longer the construction time and the irregular appearance after construction.

Table 3 below shows a comparison between the heat shrinkable sleeve and the conventional heat shrinkable sleeve of the present invention, and Table 3 makes it easy to grasp the difference between the two, and thus the effect will be very clear.

division The present invention Conventional Crosslinking Internal and external polymeric (1), woven composite (2), low-temperature copolymer (3) water simultaneously (batch process) Only polymeric material outside the heat shrinkable sleeve (separation process) Number of bonding layers in the lab 4 8 Manufacture process Bonding the low temperature copolymer (3) with aluminum (5) 2. Coating liquid emulsion zone primer (6) on aluminum (5) side Low Density Copolymer (LLDPE) Film and Polyester Adhesion 2. Bonding aluminum (5) with urethane adhesive (4) to all processes 3. Low Density Copolymer (LLDPE) Film Extrusion Coating in Modal Process 4. EAA copolymer film extrusion coating for all processes Overall thickness of the product (㎛) 30 to 40 100-105 Attachment method with sleeve Hot Melt Adhesion with Low Temperature Copolymer After corona treatment, hot melt with high temperature copolymer Polyamide Adhesion Adhesion with liquid emulsion zone primer coating surface with thickness of 0.1 ~ 0.05㎛ (adhesive force-not peelable) Copolymer of LLDPE and EAA is coextruded or filmed to a thickness of 30 to 40㎛ by separate process (adhesiveness-700g / (15mm)) Torch work No burst of sleeve due to heat The sleeve ruptures due to heat

The present invention is not limited to the above-described embodiments and can be implemented in various modifications without departing from the spirit of the present invention.

As described above, according to the present invention, since the reinforcing material wrap used for the heat shrinkable sleeve is only 30% of the total thickness as compared to the conventional product, the sealing effect is excellent at the connection part of the communication cable during heat shrinkage, Excellent adhesion, there is no interlayer separation after the torch, simplification of the process, there is an effect that the manufacturing cost is low. In particular, there is an effect that the contraction time is significantly shortened during construction.

Claims (7)

In the reinforcing material to reinforce the function of the sleeve to heat-shrink the connection of the communication cable, A reinforcement of a heat shrinkable sleeve, characterized in that the low temperature copolymer (3), the emulsion zone oily or aqueous adhesive (4), the aluminum thin film (5), and the emulsion zone copolymer primer agent (6) are laminated in this order. The method of claim 1, Reinforcement of the heat-shrinkable sleeve, characterized in that the emulsion zone oily or aqueous adhesive (4) is coated with a thickness of 0.5 ~ 1㎛. The method of claim 1, Reinforcement of the heat-shrinkable sleeve, characterized in that the emulsion zone oily or aqueous adhesive (4) is urethane. The method of claim 1, The emulsion zone copolymer primer (6) is a reinforcement of the heat shrinkable sleeve, characterized in that the coating is 0.5 ~ 1㎛ thickness. In the heat shrinkable sleeve for heat-shrink-bonding the connecting portion of the communication cable, High Temperature Polymer (1), Woven Bond (2), High Temperature Polymer (1), Low Temperature Copolymer (3), Emulsion Oily or Aqueous Adhesive (4), Aluminum Thin Film (5), Emulsion Copolymer Primer (6) A heat shrinkable sleeve, characterized in that the low temperature adhesive (7) is laminated in sequence. The method of claim 5, Wherein said thermophilic polymer (1), woven fabric (2), thermophilic polymer (1), and low-temperature copolymer (3) are crosslinked. In the reinforcing material to reinforce the function of the sleeve to heat-shrink the connection of the communication cable, The low temperature copolymer (3) and the emulsion zone oily or aqueous adhesive (4) are laminated, and aluminum deposition is performed on the emulsion zone oil or aqueous adhesive (4), and the emulsion zone copolymer primer is formed on the aluminum deposition layer. Reinforcement of the heat-shrinkable sleeve, characterized in that (6) is laminated.