These are commonly used for connectors and adjustment components that require high stress resistance or have high aesthetic requirements. Before production, the raw materials must be thoroughly dried to prevent residual moisture from causing silver streaks or bubbles on the surface of the finished product.
Secondly, the precision of mold design and manufacturing determines the details of the components. School desk and chair components often involve delicate structures such as clips, hinges, and screws. The mold must fully consider the draft angle, cooling channel layout, and venting design. For example, the gear components of a seat adjuster require precise mold cavity dimensions and a high surface finish to ensure smooth meshing and wear resistance.
In controlling injection molding process parameters, temperature, pressure, and time are crucial. The barrel temperature must be precisely set according to the material's melt index to ensure full plasticization. Injection pressure and holding time directly affect the dimensional stability and internal stress of the finished product. For thin-walled panels or large chair shells commonly found in school desks and chairs, multi-stage injection and holding pressure control should be used to prevent shrinkage marks and deformation. Sufficient cooling time is necessary to ensure the product is fully set before ejection.
Post-processing and quality inspection are equally critical. After demolding, the parts need to be deburred, and if necessary, annealing should be used to eliminate internal stress. In addition to dimensional measurement, finished product inspection should simulate actual use scenarios, including load, fatigue, and impact resistance tests, to ensure they meet the strength and durability requirements for long-term teaching environments.
Mold Steel Selection: High-quality mold steel (such as 718H) is commonly used to withstand long-term high-pressure injection wear.
Slider Mechanism Design: Used for molding side clips or grooves, ensuring structural integrity.
Surface Treatment: The cavity is high-gloss polished or textured, directly giving the back frame the desired tactile and visual effect.
Interchangeable Insole Design: Supports quick switching between different patterns or structures, reducing mold costs.