SHIJIN Journal — Packaging Insights

UV filters can degrade in light. Opaque or amber PET/HDPE at 100–200 ml protects the formula.

Print fails at the bond to the plastic, usually because low surface energy skipped pretreatment. Catch it early with the 3M tape test and a rub test on the actual bottle, and write the pass counts into the approval note.

A Pantone ‘off’ is usually split across three places: the card, the screen you compared it on, and the plastic itself. Lock one current physical chip, set a ΔE in the PO, and sign a golden sample so the blame game becomes a measurement.

A mould fee is a one-time charge for cutting and proving the steel, not a per-order surcharge. Ownership isn’t automatic — write it into the contract. Protect it by tying the final payment to your signed golden sample.

Mould cost tracks complexity; modifying an existing tool is far cheaper than new steel. Expect about 7–10 days to sample a modified tool, 15–30 for a new custom mould. Sample before full tooling payment, and keep the neck finish clear up front.

A bottle needs material compliance (FDA food-contact for the US, EU 10/2011), not a pile of certificates. Ask for a declaration tied to your resin and market; ISO 9001:2015 covers the quality system, GRS only backs recycled-content claims.

Stock bottles in an existing colour typically start around 5,000 pieces; custom colour often 10,000 and a new mould about 5,000. A very low MOQ on a custom part can mean shared or second-hand tooling — ask whether the mould already exists.

A 3D render shows the shape, not the engineering. A factory still needs wall thickness, neck finish, shrinkage and tolerances before cutting steel — the drawing, not the picture, is what makes the mould predictable.

Pantone on a bottle is a measured target, not a paint. Verify it with a spectrophotometer reading against a signed golden sample, set a real ΔE tolerance in the PO, and send a physical chip — not a screen.

A plain-English guide for formula owners with exfoliating or particulate products: why particles clog pumps, how to match particle size to a pump’s clearances, when a wide-mouth jar beats a pump entirely, which pump styles survive grit, what to confirm with the factory before you order, and a quick decision guide by scrub type.