The principle of vacuum forming machine : vacuum forming and hot forming. The forming process is mainly softened by vacuum pump vacuum, PVC, PET, PETG, APTT, PP, PE, PS and thermoplastic film are molded into various shapes. Vacuum cover, plastic tray, plastic, etc. At present, the common products on the market are: daily necessities blister packaging, small plastic blister packaging, automotive supplies blister packaging, electronic product blister packaging, food blister packaging, cosmetic blister packaging, computer peripheral equipment blister packaging, toy blister Packaging, sports goods blister packaging, stationery, blister packaging, etc. Its main structure is from feeding, pull-up, electric stove, brake, multi-function adjustable size, lower template, upper die, brake, knife switch, slicing, and vacuum device and matching, etc. It uses an automatic control system for electrical equipment such as motors, reducers, time relays, intermediate relays, and travel switches. The requirements of the control system of the vacuum forming machine are to ensure the simple operation of the function, the high precision of the mechanical action and the temperature control, the short production time, and the energy saving of the production machinery under the same conditions as much as possible.
The composition and function of the blister:
The composition and function of the blister:
1. Clamp the plastic molding equipment, which is fixed on the clamping device alone. Fixed-size table clamping devices are easier to use in general-purpose thermoforming and composite thermoforming machines. Some are the whole machine and a set of clamps. There are two types of clamping devices: one is frame type and the other is split type. The frame clamp consists of two frames. A table between two frames. When the frame is opened, it will generally remain under the fixed frame. The bottom frame of all types of single-station molding machines is directly fixed in the molded room. Semi-finished and finished products are hand-operated in manual and semi-automatic machines, and when the frame size is large, there is an open frame within the safe operation of the device. For larger parison gliding, the clamping force can be adjusted in a relatively wide range, so that the two rubberized rollers compress the springs and are equipped with pressure regulating devices. The continuous clamping block forming machine works together with the front and rear brakes on both sides of the zipper. It is best to use automatic control of the clamping device to help improve product quality and efficiency for quick action.
2. One of the main processes of vacuum heating thermoplastic film and film forming process is heating. The duration and quality of the electrothermal heat depends on the structure of the heater, the thermal inertia of the surface temperature through the radiation heat transfer, the distance between the gauges and the heater, the radiation absorption coefficient and the characteristics of the material and the thermophysical properties of the surface of the heater. Commonly used radiator heater electric heater, crystal and infrared heater.
3. The vacuum system consists of vacuum pumps, vacuum equipment, storage tanks, valves, pipes, vacuum gauges, etc., used for vacuum forming different types of vacuum pumps. The vacuum pump should be 0.07 ~ 0.07 Mpa (over 520 mm Hg). Gas storage tanks are usually welded with a steel plate in a cylindrical box with an ellipse at the bottom. The tank capacity should be at least half the capacity of the largest forming chamber. You must have the proper valve, vacuum tube, and the ability to control vacuum stenosis. The amount of rotational power of the vacuum pump depends on the molding equipment and the forming speed, which is larger than that of the molding equipment and is usually 2 - 4 kW. Specific requirements for the production and development of large-scale plants in the central vacuum system.
4. Pneumatic system of compressed air equipment itself with compressors, oil storage tanks, workshop director path sets, valves, and so on. The molding machine requires a pressure compressed air of 0.4 - -0.5 MPa and is widely used in various piston-type air compressors for vacuum forming machines. You can also use a large number of screw air compressors throughout the plant. In addition to the large amount of compressed air that should be in the shape, there is a part for the stripping, external cooling and manipulation of the early product mold frame and operating instructions and other parts of the action.
5. Cooling equipment to increase production efficiency, it is usually necessary to release the cooling before vacuum forming the product. Ideally, the inner and outer surfaces of the contact mold portion are cooled, preferably using a built-in cooling coil and mold. Non-metallic molds, such as wood, gypsum, fiberglass reinforced plastics, epoxy resins, such as molds, cannot use water, can be air cooled, and water is added to cool the vacuum molded outer surface portion. Annealed production areas can be used to improve the impact resistance of parts if natural cooling is used. Emphasis on cooling in water, although the production efficiency is high, the product is bigger.
6. The stripping device version is to put the product from the mold, the mold and the perforation, usually most of the occasion is due to the shrinkage of the product cooling and the mold, through the vacuum to attract the air hole or the opposite direction to release. Especially for small drafts or stampers, while using a demolding mechanism against or turbulent stripper dancers, sometimes single and smear release agents or mold surface spray Teflon treatment.
7. Control equipment and control systems generally include vacuum forming vacuum forming and machining processes, including instruments, meters, pipes, valves, various parameters and motion control. Control methods include manual, electromechanical automatic control, computer control, etc. The specific choices are based on initial investment and labor, technical requirements, raw material costs, production equipment and maintenance costs.
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