custom shape eyeshadow palette factory

Specific requirements for customized packaging of eyeshadow palettes of different shapes

1.1 Adaptability of special-shaped boxes

Surface transition processing: Complex curves such as shell-shaped/fan-shaped need to adopt the "progressive bending method", and add a transition buffer zone based on the 5-8mm bending radius to avoid material fatigue fracture caused by stress concentration^^

Polyhedron precision control: Hexagonal/diamond cutting and other multi-faceted structures implement the "3D die cutting + laser calibration" dual process, the cutting surface error is ≤0.5mm, and the intersection of the edges needs to be chamfered by 0.1mm^^

1.2 Functional enhancement design

Slide system optimization: Drawer-type special-shaped slide rails are made of polyoxymethylene resin (POM), the friction coefficient is controlled at 0.15-0.25, and the pull-out life is ≥10,000 times^^

Hinge enhancement plan: The zinc alloy shaft must contain a 0.5mm thick silicone shock-absorbing layer, and the opening and closing torque is kept within the range of 3.5-4.2N·m^^

II. Material and process advanced standards

2.1 Application of special materials

Transparent special-shaped box: 1.5mm PETG sheet needs to be heat-set at 80℃/2h, cooling rate ≤5℃/min to ensure arc stability^^

Metallic effect treatment: nano-imprint texture depth ≥50μm, vacuum coating layer thickness 0.2-0.3μm, salt spray test 72h without oxidation^^

2.2 Precision connection process

Curved surface splicing technology: 0.3mm PVC strips need to be pre-coated with UV curing glue, and after bonding, they must be tested for 5 times at -20℃~60℃ high and low temperature cycles without cracking^^

Magnetic suction system upgrade: NdFeB magnets (N52 grade) need to be encapsulated with double-layer epoxy resin, and the magnetic attenuation rate is ≤3%/year^^

III. Improvement of quality inspection system

Strengthening drop test: The "edge landing priority" test method is used for irregular protrusions, and the 1m height is dropped to the MDF board (density 720kg/m³)^^

Quality inspection of curved surface printing: UV flatbed printing needs to be combined with a 3D scanner, the color difference ΔE≤1.2, and the adhesion test reaches ASTM D3359 B-level standard^^

Durability verification: The magnetic structure is subjected to accelerated aging test at 50℃/95%RH environment, and the suction force remains ≥85% of the initial value after 500 cycles^^

IV. Comprehensive control of environmental protection and safety

Material traceability system: FSC-certified recycled paper must be marked with Mix number, and the phthalate content of plastic parts is ≤0.1% (w/w)^^

Humanized design: All contact surface R angles are ≥2mm, and the child safety lock structure must pass the EN71-3 test^^

Anti-counterfeiting process integration: It is recommended to add a micro-laser anti-counterfeiting code (minimum line width 0.05mm) in the hidden part of the special-shaped structure^^

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