Comparison of Joint Coating Technique between New Type of 3LPP Heat Shrink Sleeve and 3LPE Heat Shrink Sleeve

In order to master and apply the joint coating technique of 3LPP (3-layer-polypropylene) heat shrink sleeve (HSS) better and improve its construction quality, the comparison with that of 3LPE (3-layer-polyethylene) HSS was conducted in the respects of selection guide, structure, performance, requirements and procedures of construction. The technical essentials and construction experience of joint coating of 3LPP HSS were summarized. The results show that the temperature should be controlled reasonably and the ratio of hardener to primer should be adjusted according to the change of ambient temperature, and the worker training should be enhanced. Wet film construction method and intermediate frequency heating method are recommended, which can save time and improve heating efficiency and uniformity, and is beneficial to construction quality assurance.