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The sheet extrusion line is a comprehensive set of automated production equipment that heats and melts plastic raw materials through an extruder, molds them, and forms them, followed by subsequent cooling and setting, traction and fixed speed, trimming correction, and winding. The product thickness is usually 0.2-10mm, with a fixed width and a uniform cross-section, a flat plastic sheet.
According to the different raw materials and production processes, there are PET sheet extrusion lines, PLA sheet extrusion lines, etc. Taking the PET sheet extrusion line as an example, it can be divided into single-screw production lines, single-screw exhaust production lines, twin-screw exhaust production lines, twin-screw dryer-free vented extrusion lines, and other types.
The plastic granules enter the extruder from the hopper, melt under the rotation of the screw and the heating of the barrel, filter through the screen changer and enter the sheet mold, form into a flat sheet flow, and then cool and set by the calendering/three-roller setting machine, pulled by the traction device, and collected by the coiling machine or cutting stacking device after the edge is cut.
It is widely used in food packaging, advertising signs, construction, industry, furniture, home appliances, medical, and other industries. It can produce coffee cups, vegetable/fruit boxes, food containers/trays, and other products.
The extruder is the core of the production line and consists of a screw, a barrel, a motor, a feeder, a heating device, etc., which is responsible for heating, melting, and squeezing plastic raw materials.
T-die Also known as a die, it is a mold with a slit-like discharge port, which is mainly used to squeeze molten resin into a film or sheet. Our company mainly usesthe JC-times brand molds.
The screen changer is a key melt filtration equipment supporting the extruder and connected in series in front of the die (T-die). Its core role is to filter impurities, rubber particles, and coke in the molten resin to ensure the surface finish and thickness uniformity of the sheet, while protecting the subsequent die and metering components from being worn.
In the sheet production line, the melt pump is the core voltage regulating and precise metering equipment. It is usually connected in series between the extruder and the screen changer (or between the screen changer and the T-die). The core role is to stabilize the melt pressure, accurately control the melt delivery volume, and ensure the uniformity of sheet thickness and the operating stability of the production line.
Three-roller calender: controls the thickness, surface quality, and flatness of the product. The three-roller sheet is mainly 45-degree oblique and 90-degree vertical. The three-roller PET needs a horizontal J-shaped structure because of its good material fluidity.
The roller temperature control system is the core supporting temperature control unit of the three-roller calender. Its core role is to accurately regulate the surface temperature of the three rollers, match the requirements of the sheet melting and setting process, and ensure the surface finish, flatness, and thickness uniformity of the sheet. At the same time, it helps the sheet to quickly cool and set, and is suitable for the continuous operation of the production line.
The cooling bracket is an important piece of equipment in the production process of sheets. It is mainly used to further cool and shape the sheets after calendering to ensure the dimensional stability and good performance of the sheets.
Round knife cutting device: responsible for accurately removing unqualified edge materials on both sides of the sheet to ensure that the width of the sheet is consistent and the edges are flat. The core is precisely fixed-width cutting, which adapts to the continuous cutting needs of sheets of different thicknesses and materials, and ensures that the edges of the sheets are free of burrs and crimping.
Waste edge winding device: it is linked with the round knife trimming unit to simultaneously recycle and cut waste edges, keep the production site clean, realize waste recycling and reuse, and reduce the loss of raw materials.
The tractor is the core power conveying equipment from the middle to the end of the production line. Its core role is to provide stable and uniform traction for the sheet, connect the cooling setting, trimming, winding/cutting processes, and accurately control the conveying speed of the sheet to ensure that the sheet is not stretched and deformed, the size is stable, and the entire production line is synchronized to achieve continuous operation.
The winding machine of the sheet extrusion line is the core equipment at the end of the production line. It undertakes the qualified sheets after traction and trimming, and wraps them into rolls in a regular manner to ensure that the finished sheets have no folds, no tensile deformation, and high edge alignment. It is convenient for subsequent storage, transportation, and secondary processing, and is suitable for the continuous winding needs of sheets of different materials and thicknesses.
Sheet winder specifications: single-station center winder; double-station winder; three-station winder.
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