Natural rubber SVR10 and SVR20 production process
Rubber raw materials frozen are from orchards, in addition the water latex, the rest frozen in the cup, the latex is on the scraped mouth, and the frozen latex in the process of collecting latex is collectively known as latex. This material is used to produce a separate type of latex with properties different from those from water latex. This type of latex is used for car shells and intestines of all kinds. Countries with a large number of smallholder farmers often produce RSS and then SVR 10 and 20. In Vietnam, the proportion of latex products is more than products from mixed-frozen materials.
1. Sorting – storing raw materials SVR10 and SVR20:
Must manage raw materials from the beginning, separate impurities – wire – frozen, leaving these types together will be difficult to control quality. Today, due to the theft of latex, people often collect cup latex early, in some places, acid is also used to coagulate on the cup, so this latex is clumped, or it is not enough time to stabilize the cup that it is crumpled. into a lump. Small lumps of pus clot (but folk still call it cup latex). Therefore, in the past, it was specified that the cup latex content was 55% of the coagulated latex was 45%, but today it is no longer true because the early extraction procedure as mentioned above is the method of measuring the volume of pus. recommended content Please see “Research”.
If conditions permit, a crepe rolling machine should be used to roll over frozen latex blocks, even waste latex in the form of the early collection as above. Then classify by each type separately and by group of days (depending on the amount of daily collection and the storage capacity of the storage area that determines how many days a group consists of, it is best to store it under a roof, latex). If stored in the sun, the surface of this rubber product will not be able to produce high-grade tires. (Latex does not have to be rolled) In some parts of the world, people mix RSS4 and synthetic latex to produce. Export SVR 10 & 20. Raw latex is stored in clusters (clusters include: origin of raw latex, stored from date to date, quantity), these data must be kept on file for monitoring.
2. Lamination processing SVR10 and SVR20:
a. Prepare for production:
Before production, look at the records, see which clusters of materials have a satisfactory storage time, take a sample (sampling must be representative of each place in the cluster, so that about 4 to 5 locations take about 2 kg). Rolled through a rolling mill 7 times, finished drying to determine Po and impurities. Record the measured value in the monitoring record for mixing, when making many samples to have a basis for mixing between clusters according to the average value rule.
Puss – normal coagulation due to the collection is mixed with many impurities, so cleaning the latex (reducing the impurity criteria is very important). Washing treatment system to produce SVR 10 & 20 latex through many machines, many washing tanks, some places even design conveyor belts for workers to manually select to remove impurities. The control of this stage is mainly rolling and mixing so that the sheet latex is uniform and as clean as possible. After reviewing the records, the conclusion is mixed between the clusters according to the ratio found, using the measuring tool to measure the relative proportions, put in the laundry system, monitor during the machine running to avoid too much pus in the machine. tank, will lose the ability to wash the lake, adjust the machine so that the latex sheet is mixed evenly. , to have small and even nuggets for the drying process.
The operation of the oven is not difficult to follow the manufacturer’s instructions, set the drying mode (drying temperature and drying time for the trolley) according to experience, you can set a temperature mode and see Considering the properties of latex and shaping for the next time, usually frozen latex products have low drying temperature and long time, of course depending on the kiln design of each manufacturer. fixed. Usually, mixed latex products have the disadvantage of being whole, or living together, when this is the case, it is necessary to consider the specific cause, usually due to the stitching of raw materials, rarely because the latex is dry.
4. Packing, packing:
After coming out of the furnace, the latex is accurately weighed and then pressed according to the customer’s requirements, the rubber is pressed into a 35kg or 33.33kg ball, the pressed latex will be cut and packed for testing. on pallets for warehousing and separate batching.
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