Gas-Assisted Chair Mould
As a leading chair mould manufacturer in the industry, SINOMOULD possesses outstanding R&D strength and manufacturing experience in gas‑assisted chair moulds, PC transparent chair moulds, rattan chair moulds, and more. We focus on providing global customers with one‑stop gas‑assisted injection moulding solutions. These solutions effectively eliminate sink marks on thick sections of chairs, significantly improve product surface quality and structural strength, and notably reduce clamping force while shortening cycle times. This makes them the core choice for achieving lightweighting and high‑quality appearance in mass production.
Gas-Assisted Mould Parameters
| Mould Name | Gas‑assisted chair mould | Product Dimensions | 500mm × 550mm × 850mm (L × W × H) |
|---|---|---|---|
| Product Description | Gas‑assisted rattan chair | Number of Cavities | 1 cavity |
| Mould Overall Dimensions | 1400mm × 900mm × 850mm | Compatible Injection Machine Tonnage | DKM‑1150Ton (1150T clamping force) |
| Main Mould Steel | 2738H (pre‑hardened plastic mould steel, high polishability and corrosion resistance) | Injection System | Yudo hot runner system (fast color change and pressure balance) |
| Ejection System | Ejector pins | Cycle Time | Approx. 55 seconds (fine‑tuned according to material and wall thickness) |
| Mould Design Life | Over 1 million cycles | Standard Delivery Time | 80 working days |
| Core Process Features | Gas‑assist injection moulding, high‑simulation rattan design, Mould‑Tech texture, high‑precision guiding |
Quality Control Points for Gas-Assisted Chair Mould
To ensure that every chair meets ergonomic strength standards and delivers an excellent surface finish, SINOMOULD focuses on the following key quality control points:
- Elimination of gas fingers and silver streaks: Through in‑depth CAE analysis of the product structure, we successfully eliminate finger‑like gas marks (gas finger effect) and flow marks caused by unstable gas front, ensuring a smooth and flat product surface.
- Strong internal gas channels and structure: Precise gas channel design is the soul of a gas‑assisted mould. SINOMOULD strictly controls the gas penetration depth and residual wall thickness, ensuring a uniform and continuous hollow structure. This enhances local strength, allowing the chair to easily pass a rigorous 4000N load test on the backrest.
- Dimensional and geometric accuracy control: Using Mouldex3D mould flow analysis to predict and compensate for warpage, effectively solving uneven shrinkage on complex parts with many ribs. Practice shows that scientific injection control can reduce dimensional deviation by up to 45%, ensuring precise fit and stable demoulding.
- Precise gas‑inlet balance: Strictly avoids gas‑inlet imbalance that may occur during gas needle compression and release. Balanced runners and gas circuits eliminate local shrinkage, short shots, and other quality risks, achieving a mass production yield rate exceeding 98%.
Machining Essentials for Gas‑Assisted Chair Mould
The manufacturing precision and structural innovation of the mould itself are the foundation of perfect gas‑assisted moulding. SINOMOULD integrates advanced manufacturing technologies in the machining process:
- High‑precision equipment and material assurance: High‑precision 5‑axis CNC machines ensure that machining errors of mould components are kept to an extremely small range. High‑quality mould steels with excellent corrosion resistance and polishability (such as Swedish ASSAB S136, German 1.2344) are selected to ensure cavity surface finish and long service life.
- Intelligent gas needles and optimized gas channels: For the complex, irregular shape of the chair, we use high‑precision self‑cleaning gas needles combined with a design that includes rear‑mould gas needles and venting port switching. This effectively prevents gas needle clogging during the venting stage and achieves excellent nitrogen flow guidance and sealing, reducing maintenance frequency.
- Interchangeable inserts and efficient integration: A highly integrated multi‑insert combination structure allows quick interchange of chair backs, seats, or textures. With a single mould base, customers can flexibly produce multiple chair models or rattan textures. This significantly reduces mould development costs and achieves seamless synergy between gas‑assist injection and efficient product changeovers on the mould side.
