Heat Seal Mylar Bags.

The inner LLDPE sealant layers are melted and fused together under a heated jaw. Nothing is glued. Temperature, dwell time and pressure are set against the specific film, and all three matter, since too little dwell leaves a weak seal and too much heat thins the laminate.

Everything about seal quality comes back to that sealant layer, which is why we match it to the fill and the line.

Because nothing interrupts the film, a full-width seal is the tightest barrier this format offers. It suits anything opened once: single-serve, sachets, sample packs and bulk internal packs. The bag height is lower than a zippered equivalent, which improves case efficiency.

If the pack is reopened over days, that is a zipper job rather than this one.

Contamination in the seal area, usually powder or oil caught in the seam during filling. The films cannot fuse through it. We build in extra headspace above the fill line so the seal area stays clean, and we recommend confirming parameters on your own sealer with the real product.

A high-temp sealant is specified for hot-fill lines where a standard sealant would soften.

Through a tear notch cut just below the seal, so the pack opens without scissors. An easy-peel sealant is the alternative, a modified inner layer that parts cleanly by hand instead of tearing raggedly. Either can carry tamper evidence, since a broken seal is visible.

We recommend the notch on almost every heat-seal bag unless the pack is opened on a line.

Matte lamination is the standard for speciality and single-serve, and gloss is the pick for retail colour. A kraft outer suits natural sachets and sample packs, a clear window shows the product in a bag that is only opened once, and spot gloss adds detail over matte.

Unprinted stock is also available for internal, bulk and white-label use where the print is applied elsewhere.

Common faces are 3 × 5, 4 × 6 and 6 × 9 inches, measured width by length. Because there is no zipper, the same fill needs less bag height than a resealable version, so allow for headspace but not for a closure strip. Roll stock is supplied for form-fill-seal lines where the bag is formed, filled and sealed in one pass.

Runs start at 500 units, with roll stock quoted by length for machine lines. Above 1,000 the unit price steps down, and orders can go to 100,000. Free dieline help includes marking the seal and notch positions on the artwork so nothing important sits in the jaw area.

Standard runs take 7 to 10 business days and rush runs 5 to 7 business days. Samples take 5 to 7 business days, and we suggest sealing a few on your own equipment to dial in temperature, dwell and pressure before bulk.

The sample charge comes off the production order, and we ship across the USA.