A User's Guide to PE Foam Sheet Extrusion Line FB105

A.Summary

PE Foam Sheet Extrusion Line Model FB105 is a specialized equipment of producing EPE (expanded PE)sheets.It mixes the melted LDPE colophony with butane,talaum powder,shrink-resistant acidifier and other additives.It extrudes from the machine and foams at the die-lip. Finally cools by the air ring and the molding ring,and extends to pre-set length of expanded PE sheets.
Production capacity of this machine:100--150 kg/h;Product thickness: 0.5-8 mm;width:900-1,300mm

1. Screw: It is delicately made with top quality 38CrMnALAn nitriding steel. Thermal and nitriding treatment and surface chromeplating made the screw having the characteristics of high intensity,surface high rigidity and long life.The diameter of the screw is 105mm,4740mm long(two-sect style),ratio of length/diameter reaches L/D=1:45.The plastifying ability and qualities of the screw is improved.
2. Cylinder: It is delicately made with top quality 38CrMnALAn nitriding steel.Thermal treatment(seasoning+nitriding) to prevent wearing from long time service.Connections between the cylinder,material feeding sect and die-head employed by flanges.
3. Material-Feeding Sector: The two ends are connected to the cylinder and the gear box. The raw material is sent to the extruder from here.The user should keep some cooling water in circulation in order to prevent the temperature arising,which will result in pastiness and agglomeration of the raw-material,even block the material-feeding hole.
4. Main-Motor of Extruder: The main motor is an adjustable AC motor, model Z4 2000 31, power 55KW.It is cooled by air.Main motor is connected to the screw in the main machine via the gear box.
5. Butane Input and Butane Pump: The butane pump is a high pressure measuring pump.This pump jets the deliquesced butane into cylinder by a high-pressure of 10-15Mpa(100--150Kg/cm).The butane mixes with the melted LDPE in the entrance of the machine cylinder. A non-return valve is equipped in the entrance of butane into the cylinder to insure the melted LDPE will never shoot back in case that the pressure in the cylinder is higher than the butane pressure.This is also to insure production safety.
6. Input of Shrinkage Resistant Agent and Shrinkage Resistant Agent Pump: Shrinkage resistant agent pump sends the heated shrink- resistant agent into cylinder with a pressure of 10-15Mpa(100-150mm/cm).The melted shrinkage resistant agent is mixed with LDPE in the shrinkage resistant agent's entering sector. A non-return valve is equipped in the entering sector to prevent the melted LDPE from shooting back in case that the pressure in the cylinder is higher than the shrinkage resistant agent's.This is to insure the production safety.
7. Die-Head: Melted raw material is extruded from this sector.The raw material started to froth at entering the die-lip.The thickness of theexpanded PE sheet depends on the die lip and drawing speed.
8. Molding Drum: The width of the expanded PE sheet relies on this sector,so the cooling water or the cooling air should all be provided to this sector.
9. Pull Roller: The sheets extended by the molding drum should be draught after entering this sector.At this time the drawing speed should keep balanced in order to insure the quality of the material.The diameter/length of the draught roller is 480/1,550mm. It is also equipped with a speed-changeable motor so as to timing the drawing speed.
10. Swingout Winding Roller: This part is equipped with a meter counter to set the sheet's length.It rotates 180 degrees when the winding length of the first roller reaches the set requirements. Then the second roller starts winding.