① When machine is running, ensure that hopper is properly installed and raw materials are sufficient.
②Safety door must be closed during operation, control box and power box must always be closed to prevent dust and impurities from entering box.
③Do not remove protective cover of plastic melt cylinder at will to prevent burns and electric leakage. Do not stand on protective cover of plastic melt cylinder during inspection.
④It is strictly forbidden to operate injection or melting action before temperature reaches set electric heating temperature, otherwise it will cause damage to screw or oil pipe; electric heating temperature is indicated by the two signal lights on temperature controller. When temperature is reached, red light is on and heating stops; if temperature is not enough, green light is on, and heating is continued.
⑤It is strictly forbidden to use manual injection when mold is opened and injection station has not exited, otherwise fixed mold plate fixing screw may be damaged or broken or mold may fall off; it is also not allowed to manually control advancement of shooting table, otherwise mold may fall off.
⑥ It is strictly forbidden to clean rubber material of injection nozzle by hand. After temperature rise of screw is reached, hands and face are not allowed to approach injection nozzle. Even if injection does not start, air pressure in barrel can cause molten rubber to be ejected from injection nozzle and hurt people.
⑦After using high-temperature decomposition or high-viscosity raw materials, clean machine and use PE or PP rubber. Choose low-pressure and low-speed operation to prevent rubber from splashing and hurting people during cleaning.
⑧For machines with a long downtime, injection station must be exited and extremely hot melt in barrel is ejected, otherwise it is easy to cause glue breakage or flashing, and mold is also easy to be damaged.

 

During shutdown operation or emergency shutdown, press red emergency stop button to turn off control power. Heating part is not affected, and heating switch directly controls heating. If only hydraulic pump is stopped, just press stop button of hydraulic pump. Normal shutdown procedure is as follows.
①Close hopper gate and continue to operate until all rubber in barrel is ejected.
②In automatic or semi-automatic operation, machine will stop cycle due to lack of material. It can be converted to manual operation mode to discharge all rubber from barrel as much as possible to avoid staying in barrel.
③Open safety door and mold, retract thimble, remove glue wire or oil stains in mold, spray anti-rust oil again, close mold until pin is not straightened, stop when high-pressure clamping position is exceeded, so as to prevent long-time high-pressure clamping from deforming tie rod or difficult to open mold.

Hot runner technology, with its unique technical advantages such as cost saving and shortening the molding cycle, has become an important field of plastic injection molding process.

 

Advantages of hot runner technology compared with conventional cold runner:
Save raw materials and reduce costs;
Shorten molding cycle and improve efficiency of machine;
Improve surface quality and mechanical properties of products;
Point gates can be used without using three-plate molds;
A single product can be economically molded with a side gate;
Increase degree of automation;
Needle valve gate can be used to control gate for freezing;
Quality of injection molded parts of multi-cavity mold is consistent;
Improve surface aesthetics of injection molded products, etc.
Installation of hot runner is directly related to quality of product. Following are precautions for installation of hot runner:
Place mold, level upper mold, clean all holes and mold plates with an air gun.
Check size of each hole, focus on depth, and remove burrs on the mold plate. At the same time, check whether screw holes of lock splitter plate, center nail and anti-rotation pin hole have been processed. Master who made hot runner mold for the first time in this place often missed it.
Sweep hot nozzle sealant position and upper step position which are matched with mold.
Try to install hot nozzle, then remove it to check whether sealant position rubs red lead and whether step position touches mold. If not, stop installation, check cause of error and make adjustments to ensure that fit is tight and does not leak materials. Be careful not to hurt nozzle during this process.
Install all hot nozzles, install center pad, center pin, and anti-rotation pin at the same time, sweep red lead on its flat surface.
Check nozzle plane and height of center pad, and error should be controlled within 0.05mm.
Trial installation of manifold. Pay attention not to miss hot nozzle sealing ring when installing manifold.
Check coordination of manifold and hot nozzle to ensure that all red lead is touched to ensure that there is no leakage of glue.
Arrange wiring of hot nozzle to be neat and beautiful, number each group of wiring in order, and connect wiring to plug.
Formally install manifold, tighten screws of manifold (note that balance must be locked to keep four corners of manifold at same height), control manifold meson to be 0.10-0.15mm higher than plane of peripheral mold frame, and then sweep red lead on manifold meson.
Try to install code template, check whether plane touches meson red lead, and make sure that mold plate is pressed against manifold meson.
Lock mold, stand mold up, check whether fit between gate and tip of nozzle meets requirements from parting surface. Tip should be 0.1-0.2mm lower than gate surface, and tip should not be eccentric. Use a multimeter to carefully check each group of circuits to ensure that there is no short circuit, open circuit, leakage, etc., and each group of circuits corresponds correctly to ensure that all circuits are normal.
Connect thermostat to test heating, the first heating should be within 100℃, keep it for ten minutes for preheating and dehumidification, protecting heater; then, heating to required temperature, if normal, you can arrange hoisting mold test mold.