Cosmetic caps
Lipstick Case / Cap (Zinc Alloy)
A zinc alloy case or cap for lipstick bullets, often a two-part closure with a threaded inner sleeve. The shell is die cast in-house and the plastic inner sleeve is injection moulded in-house; plating and laser/print logo are outsourced; final assembly is done in-house.
Overview
- Made by
- Qinxi in-house
- Materials
- Zinc alloy (Zamak 3 / Zamak 5) shell, PP / ABS inner sleeve (injection), Optional mirror / weight (sourced)
- Finish options
- High-gloss gold, Brushed gold, Matte black, PVD coating, Spray paint, UV coating
- Customization
- Bullet diameter and tube fit, Thread or snap closure, Laser / pad-print logo, Plating and coating colour
Applications
- LipstickTwo-part closure on a lipstick bullet
Selection tips
- Confirm the bullet and tube diameter before tooling; a case that does not match the bullet will not close or will rattle.
- Lipstick is skin-contact at the rim; specify nickel-free plating and verify against REACH nickel-release limits.
- A threaded sleeve needs a matching tube thread; confirm the tube design before choosing thread over snap.
- Heavy metal cases need a soft pouch or insert so they do not scratch in the carton.
Manufacturing process & quality control points
- 1
Qinxi owns the 3D models and the dies for both the zinc shell and the plastic liner, so both are made in-house. Bottle neck standard and seat type are fixed at the enquiry stage.
Quality control points
- Neck standard and seat fit · Engineering review of the bottle drawing · Each new tool or project
- 2
The cap shell is die cast on Qinxi's own line, de-gated and tumbled. The neck seat and the outer face are the functional and visible surfaces, so fill and flash there are checked.
Quality control points
- Fill and porosity at the neck seat · Visual check under 600-1000 lx, 300 mm distance · First 5 pieces per cavity per shift
- Neck dimension vs bottle · Caliper and go/no-go gauge vs bottle neck · First article + every 2 hours
- 3
The PP / ABS inner liner is injection moulded on Qinxi's own line and trimmed. The liner carries the thread or seal that meets the bottle neck, so its seat dimension is the key fit check.
Quality control points
- Liner seat dimension and flash · Caliper and go/no-go gauge · First article + every 2 hours
- 4
Plating and coating
Supply chain / partnersThe shell is plated or coated to the target finish. Plating is outsourced to the supply chain; thickness, corrosion and colour are verified against the agreed specification.
Quality control points
- Coating thickness · XRF coating thickness gauge (ISO 3497 / ASTM B568) · One set per finish per batch
- Alcohol / sweat resistance (perfume contact) · Solvent wipe / immersion per agreed protocol · One sample set per batch
- 5
Laser / pad-print logo
Supply chain / partnersA logo is laser engraved or pad printed on the shell. This is done by the supply chain; logo position and legibility are checked.
Quality control points
- Logo position and legibility · 10x loupe vs master · Per lot, AQL 2.5 (ISO 2859-1 general level II)
- 6
Assembly and torque test
Qinxi in-houseThe shell, liner and any weight are assembled and the cap is screwed or pressed onto a test bottle. This final assembly is done in-house; open/close and sealing torque are checked so the cap seats squarely and does not loosen.
Quality control points
- Open/close and sealing torque · Torque gauge on a test bottle · Per lot, AQL 2.5 (ISO 2859-1 general level II)
- Liner-to-bottle seal · Fit check on the actual bottle · One sample set per batch
Relevant compliance
- EU REACH (SVHC)
EU
All metal & plastic parts, electroplated components and fabric coatings
- California Proposition 65
US
All products sold into California containing listed chemicals
- Nickel release (REACH Annex XVII Entry 27)
EU
Nickel-plated metal parts in prolonged & direct skin contact (handles, shafts, rings)
Get a quote for lipstick case / cap (zinc alloy)
Custom shapes, finishes and logos. Email us your artwork or sample photos.