Precautions and Processing

Drying

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▪Biodegradable materials have a strong hygroscopic property, so be sure to keep them in a dry place.

▪Dry in an oven dryer at 60℃ for at least 10 hours before using them.

▪Extrude the resin with a hopper dryer (at 70℃) installed.

▪Use up the entire quantity of resin in opened bags. If there is any residue, seal the bag completely and store it in a dry place.

   And DO NOT store resealed or even unopened product for too long. 

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Purging

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▪Biodegradable materials DO NOT have compatibility with conventional polyolefin resins like PE and PP, so DO NOT use them mixed with that kind of resin.

▪Purge the machine thoroughly with a biodegradable resin to remove all of the old deposits of material before processing a biodegradable compound, and slowly

   adjust the temperature until it reaches the processing temperature of the biodegradable compound.

▪After finishing processing, purge the machine with the same material as the one used before processing.

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Film blowing

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▪You can use a universal extruder with L/D ratios ranging from 24:1 to 30:1 and compression ratios ranging from 2.5:1 to 3:1.

▪Set the extruder temperature to 150℃ (±10℃), and DO NOT use the extruder at temperatures above 170℃.​

▪Use a die without a rod. And it is most desirable that the gap of the die is 1 to 1.5 mm and the blow-up ratio is above 2.5.

▪DO NOT preprocess with Corona or Plasma.

▪DO NOT keep the product in a fabric for a long time after producing it and process it for the finished goods within two weeks.​

▪If the film is smudged while producing it, it indicates that the resin has not yet melted completely. So be sure to check this in the film production process.

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Here are some videos of biodegradable film production using a LDPE Extrusion Line.