SL series heat air internal circulation PE film shrink packaging machine is a quite advanced shrink packaging machine in China. Adopts metal ripple heating pipe, compares to far infrared heating pipe (quartz heating pipe), has such advantages like not easily broken; heating speed fast; more well-distributed; using life longer. SL-5045 and SL-4530machines adopt transducer to control the speed adjustment. SL series all adopt temperature number illustrated controller and heat air internal circulation. It is widely used for package of beverage, foodstuff, medicine, electron, cigarette, wine, tea,  stationery, handicraft, plastic products, floor, and daily-used articles, etc. SL series heat air internal circulation PE film shrink packaging machine .