Everything about tape pant,woven sacks and plastic extrusion

PROBLEM  CAUSES  SOLUTIONS FILM PUNCTURE Hold up particle Change screen pack. Check Row Material Moisture. Check heat stability of master batch. GELES, HARD OR UNPLASTICIZED PROFILE Improper back pressure. Improper temp gradient. Moister in master batch. Change temp. Profile. Use fine wire mesh. Reduce die lip opening. Reduce adaptor flow area. Change screw geometry. Pre-dry master batch. D ENIER  VARIATION Extruder surging. Film thickness variation across width. Spacer thickness variation. Improper drive Performance. Refer problem III in general extrusion processing. Reduce throughput rate. Increase die volume. Adjust die lip. Check uniformity of die temp. Check spacer thickness. Use carbon steel blade. Check drive performance. Check temperature of orientation unit across width. Check flow velocity of hot air across width. TAPE BREAKAGE Excessive stretch ratio. Low orientation temp. Hold up particle in film. Very stiff film. Extruder surgin...

Woven Sack (Raffia)  - Raffia Plant Formula &calculations  Tape plant  like raffia  tape  stretching  plant  is an ideal plastic extrusion machinery for producing chemical bags, cement bags, rice bags, lamination fabrics and tarpaulin. This plastic extrusion equipment is used in high and quality generating plastic process to form a continuous profile from plastic raw material BELOW ARE THE FORMULAS USED IN THE PROCESSING :  Spacer Size (mm) =  (Stretching Ratio) ^1/2 x Width of Tape Stretching Ratio = ( Spacer Size/Tape Width )^2 Stretching Ratio = Stretching Godet Speed(Second godet) / holding Godet Speed(first godet) Production Kg/hr = Denier x Final Line Speed x No of Tapes x 60 / (9000x1000) Production Kg/hr = Denier x Final Line Speed x No of Tapes/ 150000 Elongation % = Tape Final Length - Initial Length x 100 / Final Length Tape Thickness Stretched = denier / (9000 x Tape Width x Density) Un-streched Tape Thickness = (Str...