50 kg/h PET Sheet Extruder for Seedling Tray Production

50 kg/h PET Sheet Extruder Product Introduction 

The 50 kg/h PET Sheet Extruder is an advanced extrusion solution for producing uniform, durable, and high-quality seedling tray sheets. It is widely used in nurseries and greenhouses for growing vegetables, flowers, herbs, and small fruit plants. The extruder’s single-screw design ensures precise control of sheet thickness and uniform material flow. The integrated PLC system allows operators to adjust temperature, screw speed, and cooling parameters efficiently, while the high-performance heating and cooling system guarantees consistent extrusion even under varying ambient conditions. The extruder produces defect-free sheets suitable for thermoforming or further molding into seedling trays, providing an efficient, reliable solution for small to medium-scale agricultural operations.

Working Principle：

Plastic granules or PET flakes are first fed into the hopper and gradually conveyed into the single-screw extruder. Inside the extruder, the granules are subjected to friction and shear from the screw, where they are melted uniformly. The molten plastic is then pushed through a precision flat sheet die, forming a continuous sheet. This sheet passes through a calibrated roller system and cooling zone, ensuring uniform thickness, smooth surface, and proper flatness. The PLC system monitors and adjusts temperature, screw speed, and cooling parameters to maintain consistent quality. Finally, the finished sheet is wound onto rolls for storage or further thermoforming into seedling trays. This controlled process reduces waste, prevents air bubbles, and ensures high-quality tray production.

Technical Specifications：

Production Capacity	50 kg/h
Material Type	PET, PP, PS
Screw Type	Single Screw
Screw Diameter	65 mm
L/D Ratio	25:1
Max Sheet Width	600 mm
Sheet Thickness	0.5–2 mm
Extrusion Motor Power	7.5 kW
Heating Power	6 kW
Temperature Zones	4 Zones, PLC Controlled
Cooling Method	Water-Cooled Rollers
Control System	PLC Touchscreen
Hopper Capacity	50 L
Machine Dimension (L×W×H)	4500 × 900 × 1500 mm
Net Weight	1200 kg
Max Screw Speed	60 rpm
Die Type	Precision Flat Sheet Die
Roller Diameter	150 mm
Sheet Surface Finish	Smooth, Uniform, Defect-Free
Power Supply	380 V, 50 Hz, 3 phase

Main features：

• Precise Single-Screw Extrusion: Ensures uniform sheet thickness and high dimensional accuracy.
• PLC-Controlled System: Enables easy adjustment of extrusion speed, temperature, and process parameters.
• High-Efficiency Heating and Cooling: Maintains smooth material flow and consistent sheet quality.
• Stable and Durable Operation: Robust construction ensures long service life and minimal maintenance.
• Defect-Free Sheets: Eliminates bubbles, warping, and uneven thickness for reliable tray molding.

Application Scenarios：

• Nurseries: Producing seedling trays for vegetables, flowers, herbs, and small fruit plants.
• Greenhouses: Continuous production of durable trays for high-volume plant propagation.
• Agricultural Research: Manufacturing uniform trays for plant growth experiments and testing.
• Vegetable Farming: Sheet production for trays used in tomato, lettuce, cucumber, and pepper seedlings.
• Floriculture: Trays for flower propagation including roses, chrysanthemums, and orchids.
• Herbal Farming: Seedling trays for mint, basil, thyme, and other herbs.
• Small Fruit Cultivation: Trays suitable for strawberries, blueberries, and similar crops.

FAQ

• Q: What materials can this extruder process?
  A: It can process PET, PP, PS, and other thermoplastic granules suitable for seedling tray sheets, providing high-quality, defect-free output.
• Q: What is the maximum sheet width and thickness?
  A: The machine can produce sheets up to 600 mm wide and 0.5–2 mm thick, adjustable according to tray requirements.
• Q: How is the sheet thickness controlled?
  A: Sheet thickness is controlled via screw speed, die gap, and calibrated rollers, monitored and adjusted through the PLC system.
• Q: Can it run continuously for long periods?
  A: Yes, the extruder is designed for stable, continuous operation with robust cooling and heating systems to maintain consistent quality.
• Q: Is the machine easy to operate for non-technical staff?
  A: Absolutely, the PLC touchscreen interface allows intuitive adjustment of temperature, speed, and process parameters.

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