Seedling Tray Moulds
Custom Seedling Tray Moulds | Precision Injection Tooling Solutions
SUNJOY Mould designs and manufactures high-precision injection moulds for agricultural seedling trays and germination plug flats. Engineered for high-speed automated lines, our tooling maintains 0.6mm wall thickness and structural rigidity, custom-configured for target press tonnages with cycle times under 28 seconds.
Product Specifications
|
Technical Parameter |
Specification Range |
Engineering Standard |
|
Mould Base Material |
LKM, HASCO, DME standard |
Pre-hardened steel blocks (45#, S50C) |
|
Core & Cavity Steel |
DIN 1.2738, P20, H13, 2316 |
Vacuum heat-treated to HRC 32-48 |
|
Cavity Configuration |
16, 32, 50, 72 cavities |
Balanced modular layout |
|
Hot Runner System |
YUDO, Incoe, Synventive |
Valve gate / Open thermal control |
|
Ejection Mechanism |
Stripper plate + pin combination |
Anti-rotation guided ejection |
|
Cooling System |
Conformal / Spiral baffled channels |
Optimized turbulent flow design |
|
Expected Tool Life |
1,000,000 to 3,000,000 shots |
Routine maintenance required |
|
Compatible Resins |
PP, PS, PE, biodegradable blends |
High flow index optimization |
Product Advantages
Wall Thickness Uniformity: Core-cavity offset controlled within plus-minus 0.02 mm via CNC milling and EDM matching, eliminating weak points in thin-walled cells.
Release-Optimized Geometry: Internal draft angles engineered to 1.5 degrees to 2.5 degrees with SPI A2/SPI B1 surface finishes, preventing root-adjacent plastic tearing during extraction.
Thermal Equilibrium Control: Drilled cooling lines positioned at 1.5 to 2 times hole diameter from cavity walls, minimizing warpage in multi-cavity plates.
High-Speed Interchangeability: Standardized plate pockets allow direct on-press replacement of individual cavity inserts, reducing workshop downtime.
Quality Control & Inspection
Steel Certification: Material chemical composition reports and ultrasonic flaw detection (UT) certificates provided prior to machining.
Dimensional Verification: All machined cavities, cores, and slides inspected via CMM against client 3D STEP/IGES data.
T0 Trial Testing: Initial 50-shot dry run followed by full-pressure resin injection trials. Dimensional reports, ejection mechanics video logs, and 10 sample parts shipped with tooling.
Customization & Engineering Support
DFM & Moldflow Analysis: Parting line definition, gate location optimization to eliminate visible surface blemishes, and fill-time simulation predicting weld lines and air traps.
Custom Cavity Layouts: Tooling footprints matched to specific platen dimensions, tie-bar spacing, and nozzle radii (Haitian, Engel, Arburg).
Drainage & Aeration Design: Bottom drainage hole cores and aeration slot inserts integrated directly into injection sequence, removing secondary punching steps.
Applications
Commercial Vegetable Transplants
Rigid multi-cavity trays for automated seeding lines (tomatoes, peppers, cucumbers).
Forestry & Nursery Propagation
Deep-cell plug trays engineered for taproot development in sapling production.
Automated Greenhouse Systems
Trays dimensionally calibrated for robotic grippers, destackers, and high-speed indexing conveyors.
After-Sales & Technical Support
Spare Parts Package: Standard replacement kit includes 2 ejector pins per size, 1 hot runner heating element, and 2 spare core inserts.
Remote Engineering Assistance: Direct access to tooling engineers via video diagnostics for process tuning and cycle time reduction.
Global Logistics & Export Packaging: Vacuum-sealed rust preventative wrapping in fumigation-free wooden crates compliant with international freight standards.
FAQ
Q: What is the lead time from DFM approval to T0 trial?
A: 35 to 55 calendar days, contingent on cavity count, steel grade, and hot runner complexity. A detailed Gantt chart issues upon design sign-off.
Q: How is warpage prevented in thin-walled seedling tray moulds?
A: Mitigated during Moldflow analysis by balancing volumetric shrinkage rates, matching cooling circuit flow rates across plates, and ensuring uniform ejection pressure distribution via stripper plates.
Q: Can moulds process biodegradable resins like PLA or PHA?
A: Yes. Bioplastic tooling requires adjusted shrink-rate calculations (lower than standard PP/PS), modified gate sizing for melt viscosity, and specific anti-corrosion internal coatings.
Q: What is the procedure if T0 samples fail dimensional checks?
A: Discrepancies identified via CMM data overlap undergo in-house steel modifications or EDM adjustments, followed by a free T1 trial run prior to final crating.
Q: Do you supply injection molding machines alongside tooling?
A: Specialized strictly in custom injection mold design and manufacturing. Machinery integration consultants are recommended for complete turn-key production cells.
Q: What data is required for an accurate tooling quotation?
A: 2D/3D part geometry files (STEP, IGES, Parasolid), anticipated annual volume, target machine tonnage/brand, and required cavity count or cycle time.
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