2. adapting form (elastic rubber circle airproof)hollow hall wrapping pipe
3. adapting hollow wall wrapping A pipe with electric hot melt
4. Adapting structural wall pipe 1 (strengthening rib) with electric hot melt B type
5.Adapting structural wall pipe 2 (strengthening rib) with electric hot melt B type
6. real wall (tractable) drain-pipe
Technical advantages:
Can produce HDPE burrowing drain pipe with many structural walls to solve once forming of bell and spigot and technical bottle-neck problems. The equipment can adopt independent configuration with different grades for socket belt electric melt B type structural wall according to demands from customers.