What is the structure of the hydraulic press used to produce plastic pallets?

Production of plastic pallet methods mainly include: injection molding, hollow blow molding, hot molding, molding harmony body assisted injection molding, etc.  Plastic pallet production molding equipment according to the characteristics of its production process, can choose different machines and equipment production.  The raw materials of hot-pressed plastic pallets are polypropylene and high-density polyethylene, which are mostly made of waste plastics.  Using hydraulic press molding plastic pallet production, simple operation, high efficiency, energy saving, suitable for mass production.

Hot pressing plastic pallet forming hydraulic press can choose four column type or frame type two structures.  We have many years of design and production experience, the equipment is commonly used 500 tons, 800 tons, 1000 tons of four column hydraulic press. Taking the 800 ton plastic pallet forming hydraulic press as an example, the characteristics and pressing process of the two hydraulic presses are introduced here.

Four column 800 tons hydraulic press machine for plastic pallet forming:

1.Four-column 800 tons plastic pallet forming hydraulic press adopts three-beam four-column double cylinder structure, with ejector cylinder, convenient demoulding.

2.hydraulic system for cartridge valve integrated hydraulic station, equipped with oil tank, two cartridge valve, motor, oil pump, oil filtration system;

3.the control system for servo drive system and industrial touch screen PLC control system, can be preset action: sliding block fast down → sliding block slow down → exhaust → pressure retention → pressure relief → sliding block return → bottom cylinder ejection product complete demoulding → bottom cylinder back.

4.with independent power mechanism and electrical system, centralized control by button.

5.four column hydraulic press machine work pressure, pressing speed, no-load fast descending and slow journey and scope, all can according to the process to be adjusted, and the ejection process to complete, can take out process, stretching process three kinds of process, each process and constant pressure, cheng is two kinds of process to choose,  The constant pressure molding process has ejection delay and automatic return after pressing.

Plastic pallet molding process: the plastic raw materials are plasticized by the screws of two extruders, and the upper and lower sheets are extruded respectively through the die. A plurality of foot piers are formed on the upper sheet, and then the upper sheet and the lower sheet are bonded together through the upper and lower dies of the die. The sheet products are heat sealed by a hydraulic press to form a plastic pallet with foot piers at one time, High production efficiency.

Frame type 800 tons hydraulic press for plastic pallet forming:

1.The whole frame or composite frame structure is welded with all steel plates; Four corner eight face right angle guide rail has high precision, good rigidity and hydraulic preloading. The hydraulic system adopts two-way cartridge integrated valve; The whole system works stably and reliably, with long service life, less leakage and fewer fault points. The electrical system of the frame type 800 ton  hydraulic press is controlled by “PLC” programmable controller, and can be configured with proportional pressure regulation, safety grating and mobile workbench according to user requirements (convenient for mold replacement). The hydraulic press of the system has the double action function of upper slider and lower cushion. According to the requirements of users, the cushion can be set as ejector or used for stretching.

2.frame type 800 tons hydraulic press for  plastic pallet forming adopts cartridge valve integrated system, and has independent electrical and hydraulic power mechanism.  Through the selection of operation panel, two forming processes of constant process and constant pressure can be realized.  The hydraulic press of this series has good rigidity, high precision and strong ability of resisting partial load.

Molding process of moulded plastic pallet: To polypropylene and other thermoplastic resin as matrix materials, and compatibility agent, antioxidant and other auxiliary materials, under the action of a double order twin-screw mixing to make material, will squeeze the clumps of material onto the frame type plastic pallet mould forming hydraulic press work station, start the hydraulic press, a molding, set up the holding time, cooling, the product out, the product can be removed.

The hot pressing plastic pallet forming hydraulic press can adopt four column structure or frame structure. But the price of frame type 800 ton plastic pallet forming hydraulic press is higher than that of four column structure. The specific choice depends on the needs of customers and production process. The pressing action of the hot pressing plastic pallet forming hydraulic press is generally: sliding block fast forward, fast pre pressing, slow pressing and forming (sometimes exhaust), pressure relief and film pulling return, ejection and film stripping, ejection and return. The action part of the press is generally composed of high and low pressure combined pump. During rapid pre pressing, both high and low pressure pumps are involved. After the pressure reaches a certain value or is pressed to a certain set position, the low-pressure pump releases pressure, while only the high-pressure pump works. In this way, low-speed pressing is formed, which is convenient for full material flow and gas discharge from the membrane cavity. Due to the large adhesion of plastic parts, the film pulling force (initial return force) of the press is large. The return force is small. The equipment can also be used for the molding of thermosetting materials and thermoplastic materials.

Hydraulic press belongs to universal machine, can be customized according to the different needs of customers.  If you need to purchase hydraulic press, please contact Tsinfa company.