Big Plastic Net Mold (Large Mesh Grid Injection Mold)
1x1 (Single-Cavity) Large Part Mold for Plastic Mesh Grids & Nets | PP/HDPE/PE | Hot Runner Valve Gate | Domestic Production, Low-Cost Mold
Produce a large mesh in a single shot — This 1x1 (single-cavity) injection mold is engineered to produce large plastic mesh grids or nets, featuring a massive rectangular cavity with a complex, finely ribbed core that forms a continuous grid pattern. The ejected white plastic part shows a flexible, open-mesh structure.
Built on a custom heavy-duty steel base with P20, 718H, or 2738 pre-hardened steel, it is designed for high-flexibility, high-impact PP, HDPE, or PE grades, offering the rigidity and long mold life needed for demanding large-part production at a low, domestically-produced cost.
A hot runner (valve gate) system with multi-point valve gates or direct gates optimizes filling of the large, thin grid, while Mold Flow Analysis (MFA) and ISO 9001:2015 / SGS certified processes ensure balanced filling, controlled warpage and consistent quality.
Technical Specifications
Core Characteristics
Large-Scale Grid Production
Capable of producing a large, continuous mesh in a single shot, eliminating the need for welding or assembly.
Complex Rib Design
The fine, intersecting rib structure requires high-precision machining to ensure uniform wall thickness and structural integrity.
Efficient Cooling System
A highly efficient, multi-circuit cooling system with external cooling hoses is designed to handle the large surface area.
Flexible Part Ejection
The grid part is flexible, requiring a carefully designed ejection system to prevent tearing or deformation during demolding.
Processing Difficulties & Countermeasures
1. Complex Grid Filling & Short Shots
DifficultyThe mesh grid consists of many thin, intersecting ribs. The plastic must flow through a complex network of narrow channels before it freezes, making it highly prone to short shots, especially at the far ends of the grid.
CountermeasureMold Flow Analysis (MFA) simulates filling of the entire grid; gate locations (often multiple valve gates) and runner diameters are optimized for balanced, rapid filling, with high-speed injection to fill thin ribs before they freeze.
2. Uniform Cooling of Large Surface Area
DifficultyThe large, flat grid has a huge surface area but very thin ribs. Uneven cooling will warp the grid, making it difficult to lay flat or fit its intended application.
CountermeasureA multi-circuit cooling system with baffled channels or bubblers placed close to the grid surface; external hoses connect to a temperature controller for uniform mold temperature, and MFA optimizes cooling time to minimize warpage.
3. Ejection of Flexible, Fragile Grids
DifficultyThe plastic grid is flexible and fragile. Standard ejector pins can punch through the thin ribs or tear the mesh during ejection, and the large size makes even ejection difficult.
CountermeasureA large stripper plate or air-assisted ejection pushes the entire grid off the core evenly with a carefully calibrated stroke; ejector pins are positioned at rib intersections (the strongest points) to distribute force.
4. Core Alignment & Rib Thickness Consistency
DifficultyThe core and cavity must align perfectly to ensure uniform rib thickness. Any misalignment causes thin spots or flashing, compromising the grid's strength.
CountermeasureHigh-strength guide pins and bushings ensure precise alignment; the core and cavity are machined to tight tolerances using high-speed CNC and EDM, with regular maintenance and alignment checks.
5. Gate Vestige & Flow Marks
DifficultyThe gate location must be carefully chosen to ensure balanced filling and avoid visible flow marks or weak spots on the grid surface.
CountermeasureMFA determines the optimal gate location; for large grids a hot runner valve gate system eliminates cold runner waste and ensures a clean gate vestige, with optimized gate size to minimize flow marks.
6. Warpage & Dimensional Stability
DifficultyPP and HDPE have high shrinkage rates. The large, flat grid is prone to warping, affecting its flatness and fit.
CountermeasureHolding pressure and cooling time are optimized during sampling; the mold uses adjustable cooling zones to fine-tune temperature distribution, and CMM dimensional inspection ensures the final part meets tight tolerances.
Applicable Industries
Our Workflow
A transparent, step-by-step process from design to delivery.
Stage 1: R&D Support & DFM Analysis
We support customer R&D for large plastic grids, creating or improving 3D files (UG, SolidWorks, ProE, AutoCAD, etc.), and provide a Mold Flow Analysis (MFA) report to optimize the grid structure, gate location, and cooling layout.
Stage 2: Mold Process & Cooling Integration
Mold design (DFM report) → check/approve → approved → make mold → integrate cooling system → produce sample → sample confirmed → check final mold quality ready to export.
We specifically validate the cooling efficiency and ejection system for the flexible grid during this stage.
Stage 3: Sample Modification & Warpage Optimization
If the first sample doesn't meet requirements (e.g., warpage or short shots), we modify the mold and fine-tune the cooling circuits and injection parameters to meet your exact requirements.
Stage 4: Sample Delivery
Produce the customer's requested quantity (typically 200-500 shots for validation), with free shipping.
Stage 5: Final Delivery
Deliver goods by sea or air; we can accommodate special requirements (like custom heavy-duty crating for the large mold) based on customer needs.
Why Choose Us?
Partner with a trusted leader in precision injection molding.
20+ Years of Experience
More than 1,500 new injection molds and parts produced since 2006, with deep expertise in large-scale molds and complex grid structures for the agricultural, logistics and construction industries.
ISO9001 Certificated
Strict quality control system, providing ROHS/CE certification for peace of mind. Every mold base and steel insert meets rigorous dimensional and structural standards.
One-Stop Service
Value-added operations simplify your supply chain from design to delivery. From Mold Flow Analysis to cooling system design, we handle the technical complexity so you don't have to.
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- Mobile: +8615000908770
- Tel: +86-21-51662821
- WhatsApp: 8615000908770
- Email: contact@yx-molding.com
- Address: Room 323, Building B, Hongchun Business Park, No. 980 Qinghewan Road, Qingpu District, Shanghai
