The correct method of preheating the suction truck is to cover the radiator first, open the drain valve, and continuously inject 60~70°C clean soft water into the radiator. When touching the drain valve by hand, feel hot. Close the drain valve, add 90 to 100°C clean soft water to the radiator, and crank the crankshaft so that the moving parts are properly pre-lubricated and then start again. Do not rush to start the engine after starting. The engine that has just started has a low viscosity, a high oil viscosity, and it is difficult for the engine oil to fill the friction surface of the motor. In the event that the filling station is insufficient, the time for queueing the taxi will be very long. Taking Xi’an’s CNG taxi as an example, each vehicle needs refueling 4 times/day, 0.5 to 1 hour/time, 0.5 hours/time, at least affecting operating income of 50 yuan per day, and earning 1,500 yuan less per month than diesel cars. , And gas quality is not easy to control, there are many problems, complaints, disputes continue. In August 2004, Shenyang City cancelled the requirement for taxis to install gas appliances. The taxis that have been updated since then are all Jetta diesel vehicles. In addition, the diesel suction truck is reliable and durable, and the failure rate is very low. It is currently impossible for any type of car to use other fuels. Finally, the current domestic gasoline and gas dual-fuel vehicle cars are actually modified, exhaust emissions have not reached the Euro III or even Euro II standards.
Overmolding is a type of Injection Molding process that combines multiple materials into a singular part or product. Overmolding can be used to combine similar materials of a different color, or to combine materials for functional purposes, such as giving a product a soft grip.
Overmolding Process Selection
Overmolding materials
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The decision which of the possible processes and mold design to select depends on:
Materials selected
Production quantities required
Methods available at the production location
Capital available for tooling
Local labor cost
Overmolding Plastic on Metal
When overmolding plastic on metal, the durable plastic is molded over the metal component. Overmolding plastic on metal is often used in manufacturing plastic handles on metal tools and in the medical, aerospace, and consumer goods industries.
Overmolding Plastic on Plastic
When overmolding plastic on plastic, the more rigid plastic component is first molded, and then the more durable plastic material is molded over the previous plastic part. This process is often used to create handheld devices, soft grips for consumer products, and a wide range of medical devices.
