粘度软化与催化到什么程度？ To what extent does the viscosity of silicone seals soften and catalyze?
Processing of high-viscosity silicone rubber, processing of high-viscosity silicone rubber elastomers includes five steps: grinding softening and catalysis, preparing preforms, extrusion or molding, vulcanization, and finishing.
硅氧烷橡胶 弹性体为在任一挤出或模塑应用中使用的处理的初始步骤是磨软化和催化。 Softening and catalyzing, the initial steps in the treatment of high consistency silicone rubber elastomers used in any extrusion or molding application are grinding softening and catalysis. "绉硬化"已存储在库存的供应商或制造者期间发生的弹性 This procedure reverses any elasticity that occurs during the period of "crepe hardening" that has been stored in stock by a supplier or manufacturer
body. Grinding also uses the addition of a peroxide catalyst to the radically cured elastomer by the manufacturer, if desired, or a mixture of two parts of the addition-cured elastomer prior to manufacture.
60,000美元购买和安装的。 Milling and catalysis is not only labor-intensive, but also requires the use of a two-roll mill, which costs about $ 60,000 to purchase and install. The elastomer is passed through the rolling mill multiple times until the composite material is homogeneous, which is then removed in the form of a sheet for further processing.
1. Prefabrication: Once the high consistency elastomer is fully fitted, the next step in the manufacturing process is the preparation of the preform. This does not require special equipment, but is very labor-intensive, especially for large-scale applications that are almost continuous in nature. Used for
For extrusion and injection molding applications, the preform is cut into strips by cutting an elastomer sheet, which is simply prepared for feeding an extruder. In the transfer molding operation, the preform is typically cut with a die-cutting machine and will fit into a plug of a transfer reservoir in a multi-station press.
For compression molding applications, the process is slightly more complicated because the preform must be cut in the basic geometry of the final part.
2. Extrusion: For high consistency elastomers, extrusion is done using a single screw extruder. The preform is fed to the extruder from the roll feed wheel to the extruder barrel, and the elastomer is extruded through a die and mandrel assembly to form the desired profile. Also, also
Supports extrusion with high consistency silicone elastomers. This is achieved by fitting a crosshead assembly into the extruder, passing through the crosshead in the support geometry and extruding a layer of silicone rubber on it.
3. Molding: The application of high viscosity silicon depends on the type of molding equipment used. The transfer and injection molding processes require operators to load the elastomer into the equipment and demold the finished part. For compression molding, the operator must place all
Profile. Because of the relatively slow curing cycles used for high-viscosity elastomers, it is possible to have a large number of cavities for the mold. 1000至2000美元每吨的夹紧力。 The cost of installing a transfer or injection molding machine is approximately $ 1,000 to $ 2,000 per ton of clamping force. Compression molding machines are quite cheap
4. Vulcanization: Vulcanization of extruded products is usually achieved with hot air vulcanization furnaces, or HAVS. These HAVS are available in horizontal and vertical configurations. In horizontal mode, the extruded profile passes through an oven, and hot air is forced on the extrudate to initiate the vulcanization mechanism.
Continued to pass. HAV配备有变速鼓在顶部通过烘箱，在那里它被固化向上拉动挤压型材。 In a vertical furnace structure, the HAV is equipped with a variable speed drum passing through an oven at the top, where it is cured and pulls the extruded profile upwards. The cost of a typical HAV furnace is about $ 30,000. Other types of employment vulcanizing ovens include radiant heat ovens and steaming
Steam oven autoclave.
5, finishing: The degree of finishing depends on the specific application. For the extrusion method, finishing involves visual inspection and cutting the tubing into specific lengths. If the tube has been cured with peroxide, the finishing process also requires an oven post-cure by-product
To remove peroxide. 模塑片材切成各个部分，以及任何烤箱后固化是必要的。 For molding applications, finishing includes trimming or trimming of the molded parts, often using die-cutting machinery to cut from larger molded sheets into various parts, and any oven post-cure is necessary. In addition to wasting materials, high concentration
Silicone finishing is labor-intensive and requires additional equipment such as ovens and die-cutting machines. However, this equipment is relatively cheap to buy.
Qinghe Hongao Sealing Parts Co., Ltd. is an enterprise with self-produced and self-sale, integrating production, processing, import and export trade. The company is a professional manufacturer of EPDM seals, door and window seals, silicone seals, rubber foam strips, foam seals, rubber seals. The factory covers an area of 5,600 square meters, with a construction area of 1,800 square meters. It has 12 million yuan in fixed assets. The company has more than 125 cadres and employees, including 13 senior engineering and technical personnel. market. We always adhere to the principle of "practical and innovative, united and enterprising", and constantly develop and develop.