Guangxi Nanning Hot Runner Company shares how to control hot runner cost   ——Hot and constant heat flow channel Today, in the development of hot runners, in today's financial crisis, everything is mainly cost-saving, and the hot runner industry is no exception. The cost of hot runner injection molds has an empirical estimation method abroad, generally according to the number of nozzles. The average cost of nozzles is 1000~1500 US dollars. The average selling price of open nozzles in China's domestic hot runners is 3,000 yuan each, and the average selling price of needle-type nozzles is 5,000-6,000 yuan each, plus plastic parts. The complexity of the hot runner is very high, which is the main reason for the slow development of hot runner injection molds from the beginning. What kind of structure is required for a plastic product, whether it is a cold runner, a hot runner, or a hot and cold mixed runner depends on various factors. After the solution of a set of injection molds is determined, the following work must be completed.    First, determine the position of the inlet according to the structure and use requirements of the plastic parts. As long as the plastic structure allows, the nozzle and nozzle tip do not interfere with the forming structure within the fixed mold insert, and the feed port of the hot runner system can be placed anywhere in the plastic part. Feed port locations for conventional plastic injection molding are typically selected empirically. For large and complex shaped plastic parts, the position of the injection molding inlet can be simulated by computer aided analysis (CAE) to simulate the flow of molten plastic in the cavity, analyze the cooling effect of various parts of the mold, and determine the ideal feed. Mouth position.    Second, the nozzle tip form of the hot runner system is determined. The use of plastic materials and products is a key factor in the choice of nozzle tip form. The production volume of the plastic parts and the manufacturing cost of the mold are also important factors in selecting the nozzle tip form.    Third, the number of cavities per mold is determined according to the production batch of the plastic part and the tonnage of the injection molding equipment.    Fourth, the number of nozzles is determined by the determined feed port position and the number of cavities per die. If a product is formed and one or more inlets are selected, a single-head hot runner system is used as long as one nozzle; if a product is formed, one or more cavities or one or more cavities are selected. For the mouth, multiple nozzles are required, that is, a multi-head hot runner system is used, except for a mold structure having a cross flow passage.    Fifth, the size of the radial dimension of the nozzle is determined according to the weight of the plastic part and the number of nozzles. At present, the nozzles of the same form have a plurality of size series, which respectively meet the molding requirements of plastic parts in different weight ranges.
XB450 Compressed Asbestos Rubber Sheet
Description:Compressed Asbestos Rubber Sheet is high quality Asbestos Sealing Gasket materials,it made by good asbestos fiber with synthetic rubber ,mixture and compression molding it.
Usage:Suitable for high temperature and high pressure,temperature 450 centigrade and 6.0MPa,for water and saturated vapour,super vapour,gas inert gases transmitted in the joints of facilities and pipelines.
TEMP:450℃(max)
PRESS:6.0MPa(max)
Dimension:
1500×1500mm;1500×1000mm;1540x1360mm
1270×1300mm; 3810×1300mm
Thickness: 0.5~6.0mm
Technical data:
Lateral Tensile Strength/MPa ≥ 18.0
Aging coefficient ≥ 0.9
Loss on ignition/% ≤ 28.0
Compression ratio/% 7~17
Recovery/% ≥ 45
Creep relaxation rate/% ≤ 50
Density(g/cm3) 1.6~2.0
Product photoes:
4100×1500mm; 4500 x 1500mm;2000×1500mm;
XB450 Compressed Asbestos Rubber Sheet
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HEBEI HENGDA SEALING MATERIALS CO.,LTD. , http://www.hengdasealing.com