• Categories:Industry News
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• Time of issue:2020-11-03 14:03
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(Summary description)Proper Content of Active Bentonite Reachtop always look into the very fine details of the quality controlling during the whole manufacturing process.Follwoing is the view on proper content of active bentonite. The proper content of active bentonite in the moulding sand is just as important as choosing the correct type of bentonite. Below are mentioned the reasons why it is important to use high-active bentonite in the moulding sand. The positive effects are to • obtain high green compression strength in order to produce stronger moulds that are easier to convey and to avoid mould deformation in the parting line. • maintain a high green tensile strength in order to avoid tear-off at stripping and weakened sand cods in the mould cavities. • obtain a higher wet tensile strength in order to avoid mould scabbing in the water condensation zone and sand expansion defects. • ensure good moulding sand plasticity to avoid sand “spring-back” and that the sand starts flowing through the injection slot and down into the moulding chamber between the shot operations. • stabilize the mould cavity to avoid such casting defects as shrinkage and other porosities, casting expansions, sand ero-sion and sand inclusion. The recommended content of active bentonite measured by means of the Methylene Blue test must be: >7% for mould height up to 600 mm. >8% for mould height from 600 to 850 mm. Reachtop is specialized in ductile iron grooved fittings and couplings. The company has passed ISO9001 quality system, and grooved products has been approved by FM,UL,CE. With DISA moulding line, Inductotherm furnace and Inductotherm pouring system, the steady high quality and timely delivery will be guaranteed.