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KR20200029938A - Heat-shrinkable tube and method for producing same - Google Patents

Heat-shrinkable tube and method for producing same Download PDF

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Publication number
KR20200029938A
KR20200029938A KR1020180108557A KR20180108557A KR20200029938A KR 20200029938 A KR20200029938 A KR 20200029938A KR 1020180108557 A KR1020180108557 A KR 1020180108557A KR 20180108557 A KR20180108557 A KR 20180108557A KR 20200029938 A KR20200029938 A KR 20200029938A
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South Korea
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heat
shrinkable tube
melt adhesive
adhesive layer
hot
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KR102095121B1 (en
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임근학
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임근학
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/18—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using tubular layers or sheathings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/0017—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor characterised by the choice of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/40—Applying molten plastics, e.g. hot melt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/005—Hoses, i.e. flexible

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

본 발명은 핫멜트 접착제층이 내벽에 형성된 열수축 튜브를 이용하여 동파이프나 알미늄 파이프와 같은 연결부재의 접합 연결부위를 기밀하게 커버하는 과정에서 열수축 튜브가 삽입되는 연결부재가 90도 이상으로 밴딩된 부위에도 열수축 튜브의 삽입 작업성이 우수한 열수축 튜브 및 그 제조방법에 관한 것이다.
본 발명은 열수축 튜브의 내벽에 형성되는 핫멜트 접착제층과, 상기 핫멜트 접착제층의 표면은 요철부로 형성되어 접촉면적을 최소화할 수 있도록 한 열수축 튜브와,
또, 이중 압출기를 이용하여 핫멜트 접착제층이 내벽에 형성된 열수축 튜브를 압출하는 압출단계; 전자선 조사기를 이용하여 상기 열수축 튜브를 가교시키는 가교단계; 상기 가교된 열수축 튜브를 소정의 직경으로 팽창시키는 팽창단계 및 냉각단계;를 포함하여 이루어지되 상기 압출단계에서 핫멜트 접착제의 베이스 수지는 용융지수(흐름지수)가 서로 다른 것을 혼합 조성하여 핫멜트 접착제층의 표면에 요철부가 성형되는 압출이 이루어지도록 한 열수축 튜브의 제조방법을 특징으로 한다.In the present invention, the hot-melt adhesive layer is formed on the inner wall by using a heat-shrinkable tube to cover a joint connection portion of a connection member such as a copper pipe or an aluminum pipe. Edo relates to a heat-shrinkable tube having excellent workability for inserting a heat-shrinkable tube and a method for manufacturing the same.
The present invention is a hot-melt adhesive layer formed on the inner wall of the heat-shrinkable tube, and the surface of the hot-melt adhesive layer is formed by an uneven portion, and a heat-shrinkable tube to minimize a contact area,
In addition, an extrusion step of extruding a heat-shrinkable tube having a hot melt adhesive layer formed on an inner wall using a double extruder; A crosslinking step of crosslinking the heat shrink tube using an electron beam irradiator; Including the expansion step and the cooling step of expanding the cross-linked heat-shrinkable tube to a predetermined diameter; the base resin of the hot melt adhesive in the extrusion step is a mixture of different melt index (flow index) of the hot melt adhesive layer Characterized by a method of manufacturing a heat-shrinkable tube so that the extrusion is formed on the surface of the uneven portion is formed.

Description

열수축 튜브 및 그 제조방법 {HEAT-SHRINKABLE TUBE AND METHOD FOR PRODUCING SAME}Heat shrinkable tube and its manufacturing method {HEAT-SHRINKABLE TUBE AND METHOD FOR PRODUCING SAME}

본 발명은 열수축 튜브 및 그 제조방법에 관한 것으로, 더욱 구체적으로는 핫멜트 접착제층이 내벽에 형성된 열수축 튜브를 이용하여 동파이프나 알미늄 파이프와 같은 연결부재의 접합 연결부위를 기밀하게 커버하는 과정에서 열수축 튜브가 삽입되는 연결부재가 90도 이상으로 밴딩된 부위에도 열수축 튜브의 삽입 작업성이 우수한 열수축 튜브 및 그 제조방법에 관한 것이다.The present invention relates to a heat-shrinkable tube and a method for manufacturing the same, and more specifically, heat-shrinking in a process of sealingly covering a joint connection portion of a connecting member such as a copper pipe or an aluminum pipe using a heat-shrinkable tube having a hot melt adhesive layer formed on an inner wall. The present invention relates to a heat-shrinkable tube having excellent workability for inserting a heat-shrinkable tube and a method for manufacturing the same, even in a portion where the connecting member into which the tube is inserted is bent at 90 degrees or more.

일반적으로 열수축 튜브는 가열 후에 경화시키면 직경이 수축되는 특성을 가지는 튜브로 구비되어 동파이프나 알미늄파이프와 같은 연결부재의 접합 연결부위를 기밀하게 커버하여 부식 등을 방지할 수 있도록 하고 있다.In general, the heat-shrinkable tube is provided with a tube having a characteristic of shrinking in diameter when cured after heating to cover airtightly connected joints of connecting members such as copper pipes or aluminum pipes to prevent corrosion.

이러한 열수축 튜브는 내벽에 핫멜트 접착제층이 형성되어 열가소성인 핫멜트에 의하여 수축의 형태변화를 제어토록 한 상태에서 피복시키고자 하는 제품을 열수축 튜브의 중공부에 끼운다음 열수축 튜브를 적정 온도에서 가열시키는 수단으로 상기 열수축 튜브가 수축되어 열수축 튜브의 중공부 내부에 배치된 연결부재를 감싸는 형태로 밀착하게 된다. The heat-shrinkable tube is a means for heating the heat-shrinkable tube at an appropriate temperature after inserting a product to be coated in a state where a hotmelt adhesive layer is formed on the inner wall to control the shape change of shrinkage by a thermoplastic hotmelt. As the heat-shrinkable tube contracts, the heat-shrinkable tube is in close contact with the connection member disposed inside the hollow portion of the heat-shrinkable tube.

이러한 열수축 튜브는 튜브 압출기와 핫멜트 접착제 압출기에 의해서 압출기 헤드를 통해 이중으로 압출됨으로써 열수축 튜브의 내벽에 핫멜트 접착제가 도포된 형태를 가지는 통상의 이중 압출수단에 의해 제조가 된다.The heat-shrinkable tube is manufactured by a conventional double extrusion means having a form in which a hot-melt adhesive is applied to the inner wall of the heat-shrinkable tube by being extruded through the extruder head by a tube extruder and a hot-melt adhesive extruder.

이렇게 제조되는 종래의 열수축 튜브의 핫멜트 접착제층의 표면은 도 8과 같이 매끄러운 표면을 갖게 되므로 이를 동파이프나 알미늄 파이프와 같은 연결부재의 상호 접합 연결부위에 열수축 튜브를 삽입하게 될 때, 열수축 튜브의 내벽에 형성된 핫멜트 접착제층의 매끄러운 표면에 의해 연결부재와 접촉되는 접촉면적이 많아지게 되면서 마찰저항이 크게 발생하기 때문에 연결부재가 밴딩되어 있는 경우에는 마찰저항으로 인하여 열수축 튜브의 삽입작업에 어려움이 있었으며, 특히 밴딩부분이 90도 이상인 경우에는 열수축 튜브의 내벽에 형성된 핫멜트 접착제층의 마찰저항으로 인하여 열수축 튜브의 삽입이 불가능할 정도로 삽입작업에 많은 어려움이 발생하여 생산성이 크게 떨어지는 문제점이 있었다.The surface of the hot-melt adhesive layer of the conventional heat-shrinkable tube manufactured as described above has a smooth surface as shown in FIG. 8, and thus, when the heat-shrinkable tube is inserted into a joint joint of a connecting member such as a copper pipe or an aluminum pipe, As the contact area in contact with the connecting member increases due to the smooth surface of the hot-melt adhesive layer formed on the inner wall, frictional resistance is greatly generated, so when the connecting member is bent, it is difficult to insert the heat shrink tube due to the frictional resistance. In particular, when the bending portion was 90 degrees or more, there was a problem in that productivity was greatly reduced due to a lot of difficulties in the inserting operation, such that it was impossible to insert the heat-shrinkable tube due to the frictional resistance of the hot melt adhesive layer formed on the inner wall of the heat-shrinkable tube.

그래서, 종래에는 열수축 튜브가 삽입되는 연결부재 부분이 밴딩되어 있는 경우에 열수축 튜브는 직경을 크게 늘리거나 두께를 얇게 형성하여 삽입작업을 용이하게 하기 위한 여러방안들이 제시된바 있으나, 이는 열수축 튜브의 수축범위가 크게 크거나 두께를 얇게 변경하는 경우에는 열수축 튜브의 커버기능도 저하될 뿐만 아니라 열수축 튜브 삽입작업도 크게 개선되지 않은 어려움이 있었다.So, in the related art, in the case where the connection member portion into which the heat shrink tube is inserted is banded, several methods have been proposed to facilitate the insertion operation by greatly increasing the diameter or forming the thickness of the heat shrink tube, but this is a contraction of the heat shrink tube. When the range is large or the thickness is changed thinly, the cover function of the heat shrink tube is not only deteriorated, but also the heat shrink tube insertion operation is not significantly improved.

따라서, 동파이프나 알미늄 파이프등과 같은 연결부재의 접합 연결부위를 커버하기 위한 열수축 튜브의 내벽에 형성된 핫멜트 접착제층의 표면 마찰저항을 최소화하여 열수축 튜브가 삽입되는 연결부재가 밴딩되어 있는 경우에도 삽입 작업성이 우수한 열수축 튜브가 절실히 요구되고 있는 실정이다.Therefore, it minimizes the surface frictional resistance of the hot-melt adhesive layer formed on the inner wall of the heat-shrinkable tube to cover the joint connection portion of the connection member such as copper pipe or aluminum pipe, and is inserted even when the connection member into which the heat-shrinkable tube is inserted is banded. There is an urgent need for a heat-shrinkable tube having excellent workability.

KR 제10-0512461호KR No. 10-0512461 KR 제10-0947707호KR No. 10-0947707 KR 제10-0755571호KR No. 10-0755571 KR 제10-0853896호KR No. 10-0853896 (특허공개문헌 0004) KR 제10-2018-0092074호(Patent Publication No. 0004) KR No. 10-2018-0092074

본 발명은 이러한 문제점을 해결하기 위한 것으로서, 열수축 튜브의 내벽에 형성된 핫멜트 접착제층의 표면을 요철부로 형성함과 아울러 상기 요철부는 열수축 튜브의 삽입 진행방향으로 돌출선을 갖도록 한 구성으로 열수축 튜브의 삽입시에 발생되는 마찰저항을 최소화할 수 있도록 한 열수축 튜브를 제공함에 있다.The present invention is to solve this problem, and the surface of the hot melt adhesive layer formed on the inner wall of the heat shrink tube is formed as an uneven portion, and the uneven portion is inserted into the heat shrink tube in a configuration such that it has a protruding line in the direction of insertion of the heat shrink tube. It is to provide a heat shrinkable tube to minimize the frictional resistance generated at the time.

본 발명은 열수축 튜브의 내벽에 형성되는 핫멜트 접착제층과, 상기 핫멜트 접착제층의 표면은 요철부로 형성되어 접촉면적을 최소화할 수 있도록 한 열수축 튜브를 특징으로 한다.The present invention features a hot-melt adhesive layer formed on the inner wall of the heat-shrinkable tube, and a surface of the hot-melt adhesive layer formed by an uneven portion so as to minimize a contact area.

상기 핫멜트 접착제층의 요철부는 열수축 튜브의 삽입 진행방향으로 돌출선을 갖도록 한 것을 특징으로 한다.The concavo-convex portion of the hot melt adhesive layer is characterized in that it has a projecting line in the direction of insertion of the heat shrink tube.

이중 압출기를 이용하여 핫멜트 접착제층이 내벽에 형성된 열수축 튜브를 압출하는 압출단계; 전자선 조사기를 이용하여 상기 열수축 튜브를 가교시키는 가교단계; 상기 가교된 열수축 튜브를 소정의 직경으로 팽창시키는 팽창단계 및 냉각단계;를 포함하여 이루어지되 상기 압출단계에서 핫멜트 접착제의 베이스 수지는 용융지수(흐름지수)가 서로 다른 것을 혼합 조성하여 핫멜트 접착제층의 표면에 요철부가 성형되는 압출이 이루어지도록 한 열수축 튜브의 제조방법을 특징으로 한다.An extrusion step of extruding a heat shrink tube having a hot melt adhesive layer formed on an inner wall using a double extruder; A crosslinking step of crosslinking the heat shrink tube using an electron beam irradiator; The expansion and cooling step of expanding the cross-linked heat-shrinkable tube to a predetermined diameter; but the base resin of the hot melt adhesive in the extrusion step is a mixture of different melt index (flow index) of the hot melt adhesive layer Characterized by a method of manufacturing a heat-shrinkable tube so that the extrusion is formed on the surface of the uneven portion is formed.

본 발명에 의한 열수축 튜브는 이중 압출수단에 의해 열수축 튜브의 내벽에 형성된 핫멜트 접착제층이 성형됨과 아울러 핫멜트 접착제층의 표면은 열수축 튜브의 삽입 진행방향으로 돌출선을 갖는 요철부가 형성되는 구조를 갖도록 함과 아울러 핫멜트 접착제층의 표면의 요철부는 연결부재에 접촉되는 접촉면적이 최소화하는 구조를 갖기 때문에 열수축 튜브가 삽입되는 연결부재가 90도 이상으로 밴딩되어 있는 경우에도 쉽게 미끄럼 작용으로 열수축 튜브의 삽입작업을 신속하게 할 수 있게 되어 연결부재 접합 연결부위의 커버 기능을 수행하게 되므로 경쟁력을 크게 높일 수 있게 된다.In the heat shrinkable tube according to the present invention, the hot melt adhesive layer formed on the inner wall of the heat shrinkable tube is formed by a double extrusion means, and the surface of the hot melt adhesive layer has a structure in which an uneven portion having a protruding line is formed in the direction of insertion of the heat shrinkable tube. In addition, since the concavo-convex portion of the surface of the hot-melt adhesive layer has a structure in which the contact area in contact with the connecting member is minimized, even when the connecting member into which the heat-shrinkable tube is inserted is bent at 90 degrees or more, the heat-shrinkable tube is easily inserted by sliding. Since it can be done quickly and performs the cover function of the connecting member joint connection part, it is possible to greatly increase the competitiveness.

도 1은 본 발명에 의한 열수축 튜브를 제조하는 과정을 나타낸 개략적으로 나타낸 블록도.
도 2는 본 발명에 의한 열수축 튜브의 구성을 나타낸 단면도 및 일부 확대도.
도 3은 본 발명에 의한 열수축 튜브를 절개하여 열수축 튜브의 내벽면에 형성된 핫멜트 접착제층의 표면을 나타낸 사시도.
도 4는 본 발명에 의한 열수축 튜브 및 열수축 튜브가 삽입되는 연결부재를 나타낸 사진.
도 5는 본 발명에 의한 열수축 튜브가 연결부재에 삽입된 상태를 나타낸 사진.
도 6은 본 발명에 의한 열수축 튜브가 연결부재에 삽입되고 열수축되어 있는 상태를 나타낸 사진.
도 7은 본 발명에 의한 열수축 튜브를 절개하여 열수축 튜브의 내벽면에 형성된 핫멜트 접착제층의 표면에 요철부가 형성된 것을 나타낸 사진.
도 8은 종래의 열수축 튜브를 절개하여 열수축 튜브의 내벽면에 형성된 핫멜트 접착제층의 표면이 매끄럽게 형성된 것을 나타낸 사진.1 is a schematic block diagram showing a process for manufacturing a heat shrink tube according to the present invention.
Figure 2 is a cross-sectional view and a partially enlarged view showing the configuration of a heat-shrinkable tube according to the present invention.
Figure 3 is a perspective view showing the surface of the hot melt adhesive layer formed on the inner wall surface of the heat shrink tube by cutting the heat shrink tube according to the present invention.
Figure 4 is a photograph showing a heat shrinkable tube according to the present invention and a connecting member into which the heat shrinkable tube is inserted.
Figure 5 is a photograph showing a state in which the heat shrink tube according to the present invention is inserted into the connecting member.
6 is a photograph showing a state in which the heat shrink tube according to the present invention is inserted into the connecting member and heat-shrinked.
Figure 7 is a photograph showing that the uneven portion is formed on the surface of the hot melt adhesive layer formed on the inner wall surface of the heat shrink tube by cutting the heat shrink tube according to the present invention.
Figure 8 is a photo showing that the surface of the hot melt adhesive layer formed on the inner wall surface of the heat shrink tube by cutting a conventional heat shrink tube is formed smoothly.

이하 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명하면 다음과 같다. 그리고 본 발명을 설명함에 있어서, 관련된 공지기능 혹은 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우 그 상세한 설명을 생략한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. And in the description of the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

본 발명의 열수축 튜브(100)는 내벽에 핫멜트 접착제층(200)이 형성되어 있는 것으로서, 이러한 열수축 튜브를 이용하여 동파이프나 알미늄 파이프와 같은 연결부재(A)를 상호 연결하는 접합 연결부위를 기밀하게 커버하는 과정에서 연결부재(A)에 열수축 튜브의 삽입 작업성이 우수한 열수축 튜브를 특징으로 한다.The heat-shrinkable tube 100 of the present invention is a hot melt adhesive layer 200 formed on an inner wall, and uses such a heat-shrinkable tube to hermetically seal a joint connecting portion connecting a connecting member (A) such as a copper pipe or an aluminum pipe. It features a heat-shrinkable tube having excellent workability of inserting the heat-shrinkable tube into the connecting member (A) during the covering process.

상기 열수축 튜브(100)는 파이프의 상호 연결부위 뿐만 아니라 강선을 이용한 상호 연결부위와 같이 다양한 형태를 가진 연결부재(A)의 접합 연결부위에 본 발명에 의한 열수축 튜브(100)를 적용하여 커버 기능을 수행할 수 있게 됨은 물론이다.The heat-shrinkable tube 100 is a cover function by applying the heat-shrinkable tube 100 according to the present invention to a jointed connection part of a connection member (A) having various shapes, such as an interconnection part using a steel wire as well as an interconnection part of a pipe. Of course, it is possible to perform.

즉, 압출 성형에 의해 열수축 튜브(100)는 원통형 구조로 되어 있고 튜브의 두께, 내경, 외경 등은 열수축 튜브가 적용되는 용도 및 환경 등에 따라 상이하게 구비되며, 이러한 열수축 튜브(100)의 내벽에 핫멜트 접착제층(200)이 형성되어 있다.That is, the heat-shrinkable tube 100 is formed into a cylindrical structure by extrusion molding, and the thickness, inner diameter, and outer diameter of the tube are provided differently depending on the application and environment to which the heat-shrinkable tube is applied, and the inner wall of the heat-shrinkable tube 100 is provided. The hot melt adhesive layer 200 is formed.

이러한 열수축 튜브(100)의 내벽에 구비된 핫멜트 접착제층(200)의 표면을 요철부(210)로 형성시켜 연결부재(A)에 접촉되는 접촉면적을 최소화시켜 열수축 튜브(100)의 삽입작업시에 핫멜트 접착제층(200)의 표면 마찰저항을 최소화할 수 있도록 함에 있다.When the surface of the hot-melt adhesive layer 200 provided on the inner wall of the heat-shrinkable tube 100 is formed by the uneven portion 210, the contact area in contact with the connecting member A is minimized to insert the heat-shrinkable tube 100. In order to minimize the surface frictional resistance of the hot-melt adhesive layer 200.

그리고, 상기 핫멜트 접착제층(200)의 요철부(210)는 열수축 튜브(100)의 삽입 진행방향으로 돌출선(210a)을 갖도록 한 구성으로 열수축 튜브(100)의 삽입시에 돌출선(210a)을 따라 원활한 미끄럼 작용을 수행하도록 함이 바람직하다.In addition, the concave-convex portion 210 of the hot-melt adhesive layer 200 is configured to have a projecting line 210a in the direction of insertion of the heat-shrinkable tube 100. When the heat-shrinkable tube 100 is inserted, the projecting line 210a is provided. It is preferable to perform a smooth sliding action along.

또, 상기 핫멜트 접착제층(200)의 요철부(210)는 도면상에서는 일직선상의 균등한 간격으로 돌출선(210a)이 표현되어 있으나, 열수축 튜브(100)의 이중 압출과정으로 성형되는 요철부(210)의 돌출선(210a)은 불규칙한 형태(랜덤)로 성형되는 것이므로 본 발명에서는 이를 한정하지 않는다.In addition, the concavo-convex portion 210 of the hot-melt adhesive layer 200 is expressed in the drawing with a projecting line 210a at equal intervals in a straight line, but the concavo-convex portion 210 is formed by a double extrusion process of the heat shrink tube 100 ), The protruding line 210a is formed in an irregular shape (random), so the present invention is not limited thereto.

이러한 본 발명의 열수축 튜브를 제조하는 방법은 이중 압출기를 이용하여 핫멜트 접착제층(200)이 내벽에 형성된 열수축 튜브(100)를 압출하는 압출단계; 전자선 조사기를 이용하여 상기 열수축 튜브(100)를 가교시키는 가교단계; 상기 가교된 열수축 튜브(100)를 소정의 직경으로 팽창시키는 팽창단계 및 냉각단계;를 포함하는 통상의 과정으로 이루어지되 상기 압출단계에서 핫멜트 접착제의 베이스 수지는 용융지수(흐름지수)가 서로 다른 것을 혼합 조성하여 핫멜트 접착제층의 표면에 요철부가 성형되는 압출이 이루어지도록 한다.The method of manufacturing the heat-shrinkable tube of the present invention includes an extrusion step of extruding the heat-shrinkable tube 100 having a hot melt adhesive layer 200 formed on an inner wall using a double extruder; A crosslinking step of crosslinking the heat shrink tube 100 using an electron beam irradiator; The cross-linked heat shrink tube 100 is expanded to a predetermined diameter by an expansion step and a cooling step; and the base resin of the hot melt adhesive in the extrusion step comprises a different melt index (flow index). By mixing the composition so that the extrusion of the uneven portion is formed on the surface of the hot-melt adhesive layer.

이러한 본 발명의 열수축 튜브를 제조하는 과정은 도 1과 같이 통상의 이중 압출수단에 의해 제조되는 것으로, 압출기의 헤드(320)에 튜브 압출기(300)와 핫멜트 접착제 압출기(310)가 구비되어 있고, 상기 튜브 압출기(300)와 핫멜트 접착제 압출기(310)에 의해서 압출기 헤드(320)를 통해 이중으로 압출됨으로써 열수축 튜브의 내벽에 핫멜트 접착제가 도포된 형태를 가지게 되며, 이렇게 압출된 튜브는 조사 단계로 이동되어 전자선 가속기(330)에서 발생하는 전자선을 이용하여 가교시킨다음 팽창 유닛(340)을 통해 팽창공정을 수행한 다음 냉각시키는 방법을 사용하여 열수축 튜브를 구성하는 최종 제품을 제조하게 된다.The process of manufacturing the heat-shrinkable tube of the present invention is manufactured by a conventional double extrusion means as shown in FIG. 1, and the tube extruder 300 and the hot melt adhesive extruder 310 are provided at the head 320 of the extruder, The tube extruder 300 and the hot melt adhesive extruder 310 are double-extruded through the extruder head 320 to have a form in which hot melt adhesive is applied to the inner wall of the heat shrink tube, and the extruded tube moves to the irradiation step It is then crosslinked using electron beams generated from the electron beam accelerator 330 to perform an expansion process through the expansion unit 340 and then to produce a final product constituting a heat shrink tube using a cooling method.

그리고, 본 발명을 구성하는 열수축 튜브(100)의 내벽에 구비된 핫멜트 접착제층(200)의 조성물은 베이스 수지, 왁스, 점착부여수지, 가소제, 충전제, 산화방지제 등으로 이루어진 통상의 핫멜트 접착제 구성성분으로 되어 있다.And, the composition of the hot-melt adhesive layer 200 provided on the inner wall of the heat-shrinkable tube 100 constituting the present invention is a common hot-melt adhesive component composed of a base resin, wax, tackifying resin, plasticizer, filler, antioxidant, etc. It is made.

상기 핫멜트 접착제의 베이스 수지는 에틸렌 아세트산 비닐(EVA) 공중합 수지, 폴리에틸렌계 수지, 폴리에스테르계 수지, 폴리올레핀 엘라스토머(POE), 에틸렌 프로필렌 디엔 고무(EPDM) 등에서 선택되는 1종으로 이루어진다.The base resin of the hot melt adhesive is composed of one selected from ethylene vinyl acetate (EVA) copolymer resin, polyethylene resin, polyester resin, polyolefin elastomer (POE), and ethylene propylene diene rubber (EPDM).

본 발명의 핫멜트 접착제는 상기와 같이 통상의 구성성분으로 이루어지되 핫멜트 접착제의 베이스 수지는 용융지수(흐름지수)가 서로 다른 것을 혼합 조성함으로써 핫멜트 접착제층(200)의 압출시에 베이스 수지의 서로 다른 용융지수(흐름지수)에 의해 핫멜트 접착제층(200)의 표면이 요철부(210)가 성형되도록 한 것이다.The hot-melt adhesive of the present invention is composed of the usual components as described above, but the base resin of the hot-melt adhesive is different in composition of the base resin during extrusion of the hot-melt adhesive layer 200 by mixing and mixing different melt indexes (flow index). The surface of the hot melt adhesive layer 200 is formed so that the uneven portion 210 is formed by the melt index (flow index).

예를 들어, 에틸렌 아세트산 비닐(EVA) 공중합 수지의 경우에도 제품에 따라 용융지수, 밀도, 연화점, 융점 등이 서로 다른 물성을 가지고 있으며, 이러한 서로 다른 물성의 EVA 수지를 혼합 조성하여 핫멜트 접착제의 베이스 수지로 적용하되 1~2의 용융지수를 EVA 수지와 3~5의 용융지수를 가진 EVA 수지를 혼합하여 조성된 베이스 수지를 가진 핫멜트 접착제를 압출하는 경우에 용융지수가 서로 다른 EVA 수지는 흐름편차가 발생하면서 요철부를 성형하게 된다.For example, even in the case of ethylene vinyl acetate (EVA) copolymer resin, the melt index, density, softening point, melting point, etc., have different physical properties depending on the product. When applying a resin but extruding a hot melt adhesive having a base resin formed by mixing an EVA resin having a melt index of 1 to 2 with an EVA resin having a melt index of 3 to 5, EVA resins with different melt indexes have flow deviations. As it occurs, the uneven portion is molded.

즉, 이중 압출에 의해 열수축 튜브(100)의 내벽에 형성되는 핫멜트 접착제층(200)의 표면은 핫멜트 접착제를 구성하는 베이스 수지의 용융지수가 서로 다른 물성에 의해 열수축 튜브(100)의 삽입 진행방향으로 랜덤한 돌출선(210a)이 핫멜트 접착제층(200)의 표면에 자연스럽게 형성되는 것이다.That is, the surface of the hot-melt adhesive layer 200 formed on the inner wall of the heat-shrinkable tube 100 by double extrusion is inserted in the direction of insertion of the heat-shrinkable tube 100 due to different physical properties of the base resin constituting the hotmelt adhesive. As a result, a random protrusion line 210a is naturally formed on the surface of the hot melt adhesive layer 200.

이와 같이 된 본 발명의 열수축 튜브의 내벽에 형성된 핫멜트 접착제층의 표면은 열수축 튜브의 삽입 진행방향으로 돌출선을 갖는 요철부(210)가 형성되어 있기 때문에 연결부재(A)에 접촉되는 접촉면적이 최소화되어 열수축 튜브가 삽입되는 연결부재(A)가 90도 이상으로 밴딩되어 있는 경우에도 쉽게 미끄럼 작용으로 열수축 튜브의 삽입을 용이하게 할 수 있게 되어 작업 생산성을 크게 높일 수 있게 된다.The surface of the hot-melt adhesive layer formed on the inner wall of the heat-shrinkable tube of the present invention is formed with a concave-convex portion 210 having a protruding line in the direction of insertion of the heat-shrinkable tube, so that the contact area contacting the connecting member (A) Even when the connecting member (A) into which the heat shrink tube is inserted is minimized is bent at 90 degrees or more, it is easy to easily insert the heat shrink tube by sliding, thereby greatly improving work productivity.

이상에서 본 발명은 상기 실시예를 참고하여 설명하였지만 본 발명의 기술사상 범위 내에서 다양한 변형실시가 가능함은 물론이다.In the above, the present invention has been described with reference to the above embodiments, but it is of course possible to perform various modifications within the technical scope of the present invention.

100 : 열수축 튜브 200 : 핫멜트 접착제층
210 : 요철부 212 : 돌출선
300 : 튜브 압출기 310 : 핫멜트 접착제 압출기
320 : 압출기 헤드 330 : 전자선 가속기
340 : 팽창 유닛 A : 연결부재
100: heat shrink tube 200: hot melt adhesive layer
210: uneven portion 212: protrusion line
300: tube extruder 310: hot melt adhesive extruder
320: extruder head 330: electron beam accelerator
340: expansion unit A: connecting member

Claims (3)

열수축 튜브(100)의 내벽에 형성되는 핫멜트 접착제층(200)과,
상기 핫멜트 접착제층(200)의 표면은 요철부(210)로 형성되어 접촉면적을 최소화할 수 있도록 한 것을 특징으로 하는 열수축 튜브.
The hot melt adhesive layer 200 formed on the inner wall of the heat shrink tube 100,
The surface of the hot-melt adhesive layer 200 is formed by the concave-convex portion 210 so that the contact area can be minimized.
제 1항에 있어서,
상기 핫멜트 접착제층(200)의 요철부(210)는 열수축 튜브(100)의 삽입 진행방향으로 돌출선(210a)을 갖도록 한 것을 특징으로 하는 열수축 튜브.
According to claim 1,
The hot-melt adhesive layer 200 of the concave-convex portion 210 is a heat-shrinkable tube, characterized in that it has a projecting line (210a) in the insertion direction of the heat-shrinkable tube (100).
열수축 튜브의 제조 방법으로서,
이중 압출기를 이용하여 핫멜트 접착제층이 내벽에 형성된 열수축 튜브를 압출하는 압출단계;
전자선 조사기를 이용하여 상기 열수축 튜브를 가교시키는 가교단계;
상기 가교된 열수축 튜브를 소정의 직경으로 팽창시키는 팽창단계 및 냉각단계;를 포함하여 이루어지되
상기 압출단계에서 핫멜트 접착제의 베이스 수지는 용융지수(흐름지수)가 서로 다른 것을 혼합 조성하여 핫멜트 접착제층의 표면에 요철부가 성형되는 압출이 이루어지도록 한 것을 특징으로 하는 열수축 튜브의 제조방법.
As a method of manufacturing a heat shrink tube,
An extrusion step of extruding a heat shrink tube having a hot melt adhesive layer formed on an inner wall using a double extruder;
A crosslinking step of crosslinking the heat shrink tube using an electron beam irradiator;
Including the; expansion step and cooling step of expanding the cross-linked heat-shrinkable tube to a predetermined diameter;
In the extrusion step, the base resin of the hot melt adhesive has a melt index (flow index) mixed with each other, so that a concave-convex portion is formed on the surface of the hot melt adhesive layer to perform extrusion.
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KR102204970B1 (en) * 2019-12-11 2021-01-19 이상덕 Extruder of heat-shrinkable tube

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