HANGING PROCESS

Result of grinding the crumbs into sheets about 60 cm wide with a thickness of 6-7 mm.

Weakness has turned into a homogeneous sheet / Blanket.

Blanket rolled and then sent to the Maturation Warehouse for the "Curing" process.

1 roll weighs approximately 350 kg (wet weight). The level of dry rubber in a wet blanket produced is around 70% (pre-maturation value).

Maturation

1. Blangket drying is done by arranging sheets in the clothesline.
2. Hanging process lasts for 15-20 days.
3. Rubber raw material will dry faster in the Dryer process and the possibility of fewer white spots.
4. Fig. Blangket arranged in Maturation Warehouse
5. Each clothesline will be arranged so that each blanket can be identified according to their age and owner with adequate ventilation space
6. The purpose of drying blankets is to maintain the PRI value and to participate in reducing the Moisture Content in Blanket.
7. Usually the level of dry rubber after maturation for 15-20 days is 80-90%.
8. The PRI value is a measure of the amount of rubber plasticity that is still stored if the rubber is heated for 30 minutes at 140 degrees Celsius.
9. PRI testing is carried out to measure the degradation (decrease) of resistance of raw rubber to oxidation at high temperatures.
10. Values ​​of more than 80% indicate that the resistance of raw rubber to oxidation is large. By knowing the PRI value, it can be estimated whether or not rubber becomes soft and sticky if it is stored or heated for a long time. This is important later in the process of vulcanizing rubber making finished goods, in order to obtain rubber properties that are stronger and more robust in accordance with quality parameters that must be met by the final product for SIR 20:10