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EXPLANATIONS OF PRODUCTION&QUALITY CONTROL OF BIO-DEGRADABLE FILM

PROCESSING TEMPERATURE
THE PROCESSING TEMPERATURE OF BIO-DEGRADABLE PACKING FILM IS LOWER THAN THAT OF ORDINARY PACKING FILM.USUALLY,WHEN THE BM BIODEGRADABLE MOTHER BATCH CONTENT IS 30%,THE PROCESSING TEMPERATURE IS 10℃
20℃ LOWER THAN ORDINARY PACKING FILM.THE HIGHER THE BM BIODEGRADABLE MOTHER BATCH IS, THE LOWER THE PROCESSING TEMPERATURE SHOULD BE, ESPECIALLY FOR THE MOULD HEAD.IF NECESSARY,IT CAN BE TURNED OFF AFTER THE PLASTICS BLOWING IS NORMAL.WHEN THE BM BIODEGRADABLE MOTHER BATCH CONTENT IS <60%,THE TEMPERATURE DROPS MORE SIGNIFICANTLY WITH THE INCREASE IN BM BIODEGRADABLE MOTHER BATCH,WHILE THE BM BIODEGRADABLE MOTHER BATCH IS >60%,THE DROP OF TEMPERATURE IS SMALLER WITH THE INCREASE IN BM BIODEGRADABLE MOTHER BATCH,IN THE PLASTICS BLOWING PROCESS,IF THE PROCESSING TEMPERATURE IS RAISED,THE TEMPERATURE RISING SHOULD START WITH PLASTICIZING ZONE,SINCE THE BM BIODEGRADABLE MOTHER BATCH  IS VERY SENSITIVE TO THE TEMPERATURE,THE TEMPERATURE-RISING RANGE IS ABOUT 2℃ EACH TIME.IF THE PROCESSING TEMPERATURE HAS TO BE DROPPED,THE TEMPERATURE DROPPING SHOULD START WITH MOULD HEAD.IF NECESSARY,THE TEMPERATURE OF EACH HEATING SECTION SHOULD BE DROPPED EXTENSIVELY.THE RANGE IN PLASTICIZING ZONE CAN BE SMALLER,AND THE RANGE AT MOULD HEAD CAN BE WIDER.
VARIOUS PROCESSING TEMPERATURES&ADJUSTMENT RANGES VARY WITH DIFFERENT EQUIPMENTS.

EXTRUSION AMOUNT
THE EXTRUSION AMOUNT SHOULD NOT BE TOO LARGE.USUALLY AROUND 80% OF RATED EXTRUSION AMOUNT;OTHERWISE, AFTER EXTRUDER RUNS FOR A PERIOD OF TIME,THE FRICTION SHEAR HEAT WILL RISE.(AS COMPARED WITH ORDINARY POLYETHYLENE,THE FRICTION SHEAR HEAT IS HIGHER.THE TEMPERATURE-RISING IS QUICKER AND THE RISING RANGE IS LARGER)IT WILL CAUSE THE ACTUAL TEMPERATURE TO RISE&BUBBLE EMERGENCE ON FILM SURFACE.


OTHER TECHNIQUES

BLOW-EXPANSION RATIO:4:5:1
6:5:1 SOMETIMES 7:1 IF THE BM BIODEGRADABLE MOTHER BATCH CONTENT IS >80,THE BLOW-EXPANSION RATIO SHOULD NOT BE >6.5:1.BECAUSE THE BM BIODEGRADABLE MOTHER BATCH CONTENT INCREASES, THE STARCH CONTENT INCREASES ACCORDINGLY.HOWEVER,WHEN THE POLYETHYLENE CONTENT DECREASES.THE HORIZONTAL TENSILE STRENGTH OF MATERIAL IS RESTRICTED SUBSEQUENTLY.WHEN THE BLOW-EXPANSION RATIO IS TOO LARGE,THE FILM IS EASY TO RUPTURE DUE TO POOR FILM STABILITY AND NON-UNIFORMITY OF FILM THICKNESS.
2.HEIGHT OF COOLING CURVE:SIMILAR TO ORDINARY LOW PRESSURE PACKING FILM.
3.MOULD HEAD: LOW PRESSURE MOULDING HEAD WITH SHAPING ROD. FOR EXAMPLE,(40% MOTHER BATCH) WHEN THE DIAMTER OF MOULD MOUTH IS 100MM,THE PRODUCIBLE WIDTH OF BIODEGRADABLE PACKING FILM IS 700
1000MM,THE BLOW EXPANSION RATIO IS 4.8:16.5:1 WHEN THE DIAMETER OF MOULD MOUTH IS 40MM,THE PRODUCIBLE WIDTH OF BIODEGRADABLE PACKING FILM IS 300MM410MM,THE BLOW EXPANSION RATIO IS 4.8:16.5:1
4.PHYSICAL PROPERTIES

TENSILE STRENGTH
THE TENSILE STREIGTH OF BIODEGRADABLE PACKING FILM IS LOWER THAN ORDINARY PACKING FILM.THE HIGHER THE BM BIODEGRADABLE MOTHER BATCH CONTENT IS, THE LOWER THE TENSILE STRENGTH WILL BE.
FRACTURE ELONGATION RATE
SINCE THE PLASTICIZING STRENGTH,COOLING CURVE HEIGHT OF FILM BUBBLE.BLOW-EXPANSION RATIO,STABILITY OF FILM BUBBLE&THICKNESS HAVE INFLUENCE UPON FRACTURE ELONGATION RATE TO A CERTAIN EXTENT.THE FRACTURE ELONGATION RATE HAS A TENDENCY TO DROP WITH THE INCREASE IN MOTHER BATCH CONTENT, BUT THE EFFECT IS LESS OBVIOUS ON TENSILE SIRENGTH.

DART IMPACT STRENGTH
THE DART IMPACT STRENGTH OF BIODEGRADABLE PACKING FILM IS LOWER THAN ORDINARY PACKING FILM,BUT THE INFLUENCE IS NOT SO SIGNIFICANT.

5.NOTICEABLE PROBLEMS IN THE PROCESS OF PRODUCTION
IF THE BM BIODEGRADABLE MOTHER BATCH CONTENT EXCEEDS 60%, THE ORDINARY POLYETHYLENE CAN BE USED AT FIRST WHILE LIFTING THE FILM.ONCE THE PLASTICS BLOWING BEACOMES NORMAL,THE MATERIAL CONTAINING BIODEGRADABLE MOTHER BATCH CAN BE PUT INTO PRODUCTION.
WHILE PRODUCING BIO-DEGRADABLE PACKING FILM ,THE CHANGE OF SCREEN CLOTH IS MORE FREQUENT THAN THAT OF ORDINARY PACKING FILM. THE HIGHER THE BM BIODEGRADABLE MOTHER BATCH CONTENT IS.THE SHORTER THE INTERVAL WILL BE.FOR INSTANCE, THE SCREEN CLOTH SHOULD BE CHANGED ONCE EVERY 12HOURS FOR ORDINARY PACKING FILM. THE SCREEN CLOTH SHOULD BE CHANGED ONCE EVERY 8 HOURS FOR 30% BM MOTHER BATCH. THE SCREEN CLOTH SHOULD BE CHANGED ONCE EVERY 5 HOURS FOR 60% BM MOTHER BATCH. PRIOR TO SHUT DOWN,THE SCREW&MOULD HEAD SHOULD BE CLEANED WITH PE MATERIAL, IN CASE OF LONG TERM PRODUCTION,THE SCREW&MOULD HEAD SHOULD BE CLEANED PIRIODICALLY(ONCE EACH WEEK).IT IS BETTER TO OPEN THE PACKAGE WHILE USING THE BM BIODEGRADABLE MOTHER BATCH,OTHERWISE IT WILL ABSORB THE MOISTURE&MAY CAUSE THE BUBBLE EMERGENCE ON FILM.THE HOPPER SHOULD BE COVERED.
THE TRANSPARENCY OF BIODEGRADABLE PACKING FILM IS POORER THAN THAT OF ORDINARY PACKING FILM,WHILE THE OPENING PROPERTY IS BETTER.
WHILE PRODUCING THE COLOURED BIODEGRADABLE PACKING FILM.THE QUALITY OF COLOURED MOTHER BATCH GRANULES CAN AFFECT THE QUALITY OF THE FILM, THEREFORE,IT IS BETTER TO CHOOSE COLOURED MOTHER BATCH GRANULES WITH GOOD FLOWABILITY,GOOD DISPERSITY AND GOOD PLASTICITY.BECAUSE OF THE SPECIALITY OF BM BIODEGRADABLE MOTHER BATCH,WHILE PRODUCING THE PACKING FILM WITH A THICKNESS OF MORE THAN 0.02MM TO ADD CERTAIN AMOUNT OF REGENERATIVE MATERIAL IS PERMISSIBLE,BUT THE REGENERATIVE MATERIAL MUST BE PURE AND CLEAN.BESIDES,THE ADDITION CAN NOT EXCEED 50%.

 

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