Skin Packaging

A blister pack needs a mould to form a cavity before the product goes in. Skin packaging removes that step. The product is laid on a porous board that carries a heat-activated coating, the board sits on a vacuum platen, and a sheet of ionomer, LDPE or PE-based skin film is heated to around 150–200 °C until it sags, then dropped over the product while vacuum is pulled through the board. The film shrinks onto every contour of the product and fuses to the coating between and around the items. The only "tooling" is the printed card and, for tight shapes, a simple locating fixture.

Materials: the film is most often an ionomer (Surlyn-type) for clarity, toughness and hold-down on heavy items, or a plain LDPE or blended PE film for cheaper packs. Gauges run from 75 micron for light items to 150–200 micron for tools and metal parts. The board is a solid bleached or duplex card of about 350–600 GSM, or E-flute corrugated for heavy products, with a porous heat-seal coating on the print side. Because vacuum must pull through the board, non-porous boards and full-coverage varnishes fail — the printer needs to know the card is for skin packaging.

Skin packaging wins where the product is irregular, heavy or produced in short runs: hand tools, brass fittings, plumbing components, automotive spares, fasteners, small motors, sample kits and industrial replacement parts. A distributor in Rajkot packing forty different spare parts for a catalogue can run them all on one machine with one card size and no moulds; a blister supplier would need forty tools. The film hold-down also stops heavy parts shifting, which is the weakness of a face-seal blister with a loose product.

Its limitations are appearance and reclosability. The film surface is slightly matte and shows every contour, so it looks industrial rather than premium; it is single-use, since removal tears film and coating; and multiple small items can be hard to separate cleanly. Where retail presentation, a glossy cavity or tamper-evident reclosing matters, a trapped blister or clamshell is the better format. Skin packs also need a porous card, which rules out fully laminated glossy boards.

Note the confusion with vacuum skin packaging (VSP) for fresh meat and fish, which uses a barrier film and tray for shelf life. The principle is the same — film drawn down onto the product — but the materials, machines and purpose are different, and this glossary entry refers to the display and industrial-parts format.

We produce skin packs alongside our blister and clamshell formats, so a product line can be split by volume: skin cards for low-volume or irregular items, blisters for the fast movers, with matching printed cards across both.