Production Line
Sichuan Forever Radiation Technology Co.,Ltd has 3mev10ma electron traveling wave linear accelerator made in Japan and 10MeV electron traveling wave linear accelerator made in Russia 1mA electron accelerator, EPS ﹣ electron beam irradiation processing system, dry electronic thin tube continuous expanding machine made in Korea, wet large diameter continuous expanding machine made in Korea, pipe compound extrusion unit made in Korea, continuous gluing machine made in America, sheet continuous laminating machine, continuous stretcher, continuous crimping machine, end cap automatic expanding machine and other production equipment, as well as Huck rheology tester made in Germany and Regel electronics Universal testing machine, 150KV partial discharge testing system, crosslinking degree testing system and other experimental testing equipment have established the most advanced and complete variety of heat shrinkable products production base in China.
We can guarantee quality because of our most advanced production line.
OEM/ODM
We are constantly working on better design, better production procedures,and always try to pay attention to those details.
Sichuan Forever Radiation Technology Co.,Ltd is the birthplace of China's radiation crosslinking materials. As the National Rradiation Crosslinking Heat Shrinkable Material Technology Center, the pipeline radiation crosslinking heat shrinkable material technology has been extended to most of China's pipeline radiation crosslinking heat shrinkable manufacturers. The products are manufactured according to Chinese Standard GB/T23257 / Russian Standard GOST P 51164 / European Standard EN12068 / German Standard DIN30672 / International Standard Organization ISO21809. China's first DVGW testing and certification enterprise in 2005.
R&D
The first heat-shrinkable sleeves were introduced over 35 years ago when polyethylene pipeline coatings started to replace bituminous or tape coatings in the oil and gas industry. Back then, the processing for polyethylene to make the sleeve backing was new technology and the adhesives used in sleeves were much the same as those used on pipeline coatings.
The technology used to make sleeves has advanced significantly since then, with new methods of cross-linking the polyolefin backings and new generation adhesives that are formulated to provide performance under more demanding pipeline conditions.
Polyolefin Backing
Heat-shrinkable means just that, heat them up and they shrink, or more correctly, they recover in length. A heat-shrinkable sleeve starts out with a thick extruded polyolefin sheet (polyethylene or polypropylene) that is formulated to be cross-linkable. After extruding the thick sheet, it is taken to the “beam” where it is passed under a unit that subjects the sheet to electron irradiation.[2] The irradiation process cross-links the polyolefin. This improves the molecular structure such that the polyolefin will work as part of a heat-shrinkable sleeve and provide the required level of mechanical protection while in-service. It makes the polyolefin perform more like a tough, heat-resistant, elastic material or rubber,[3] rather than like a plastic material.
After cross-linking, the sheet is stretched by feeding it into a machine that heats it up, stretches it and cools it down. Because the sheet has been cross-linked, after stretching, it will want to recover to its original length when re-heated.
An adhesive is then applied to the sheet and we use proprietary techniques depending on the type, viscosity and melting temperature of the adhesive. The adhesive is the key to ultimate performance of the installed system, which is why different adhesive types will be specified depending on the pipeline operating conditions.
The adhesive has many functions; it adheres the installed sleeve to the steel at the coating cutback and mainline coating, it resists shear forces imparted by soil pressure after the pipeline is buried and provides long term corrosion protection to the steel. The choice of which adhesive to use is based on the pipeline design and operating conditions. As an example, for small diameter flow lines operating at ambient temperatures, a soft mastic-based adhesive may be chosen, while on large diameter pipelines operating at higher temperatures, a hard, semi-crystalline hot-melt adhesive is used. The adhesive needs to be chosen based on its corrosion protection properties, adhesion strength, and resistance to shear forces imparted by pipe movement and the effects of soil pressures.
The products are manufactured according to Chinese Standard GB/T23257 / Russian Standard GOST P 51164 / European Standard EN12068 / German Standard DIN30672 / International Standard Organization ISO21809. China's first DVGW testing and certification enterprise in 2005.