HIGH DENSITY POLYETHYLENE TUBE AND JOINT

• Main Authors: NAGATA JUNYA, HONBOU KYOUKO, TERAO YOSHINORI
• Format: Patent
• Language: English; Korean
• Published: 07.08.2020
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR POWER PLANT; PERFORMING OPERATIONS; PHYSICS; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS

Provided are a high-density polyethylene pipe and a joint, which suppress degradation due to external factors such as radiation, oxygen, ultraviolet rays, and the like and a chemical crack due to chemical substances. To this end, the high-density polyethylene pipe (10) and the joint comprise: a conduit (1) whose principal component is high-density polyethylene with the density ranging from 0.940 g/cm^3 to 0.980 g/cm^3; an inner gas barrier film (2a) which covers the inner surface of the conduit (1), and includes an ethylene-vinyl alcohol copolymer resin; an outer gas barrier film (2b) which covers the outer surface of the conduit (1), and includes an ethylene-vinyl alcohol copolymer resin; a fusing prevention film (3b) which covers the outer surface of the outer gas barrier film (2b), and includes a resin whose melting point is 150°C or higher; and an outer layer (4b) which covers the outer surface of the fusing prevention film (3b), and whose principal component is low-density polyethylene with the density ranging from 0.910 g/cm^3 to 0.930 g/cm^3. Therefore, the integrity of the pipe can be maintained for a long period. 방사선, 산소, 자외선 등의 외적 인자에 의한 열화나 화학 물질에 의한 케미컬 크랙이 억제되는 고밀도 폴리에틸렌관 및 조인트를 제공한다. 고밀도 폴리에틸렌관(10) 및 조인트는, 밀도가 0.940g/㎤ 이상 0.980g/㎤ 이하인 고밀도 폴리에틸렌을 주성분으로 하는 도관(1)과, 도관(1)의 내표면을 덮고, 에틸렌·비닐알코올 공중합 수지를 포함하는 내측의 가스 배리어 필름(2a)과, 도관(1)의 외표면을 덮고, 에틸렌·비닐알코올 공중합 수지를 포함하는 외측의 가스 배리어 필름(2b)과, 외측의 가스 배리어 필름(2b)의 외표면을 덮고, 융점이 150℃ 이상인 수지를 포함하는 융착 방지 필름(3b)과, 융착 방지 필름(3b)의 외표면을 덮고, 밀도가 0.910g/㎤ 이상 0.930g/㎤ 이하인 저밀도 폴리에틸렌을 주성분으로 하는 외층(4b)을 구비한다.