WILPAC Dairy Packaging Lines: Fine Powder Dosing, Hygienic Servo Film Pulling and Whole-Line Integration

Dairy products fail on a packing line in three specific ways. Milk powder dusts into every gap, bridges in the dosing head and welds itself into the seal seam, so the bag looks perfect and leaks three weeks later. Cheese is a living product that keeps respiring inside the pack, so any residual oxygen or a single wrinkle in the barrier film becomes a mould spot in the display cabinet. Yogurt and fermented milk are temperature sensitive and must be filled cold, quickly and without condensation dripping into an open pouch. A line that is not designed around these three behaviours will pass inspection on day one and generate complaints in month two.

Milk powder is the hardest of the three. Bulk density shifts between production batches, the powder carries air after spraying and it is highly electrostatic. WILPAC lines therefore combine a screw or multihead weighing section with a sealed dosing chamber held under slight negative pressure, so dust is captured at the source instead of settling on the sealing jaws. Film transport is driven by servo film pulling with closed loop tension control: the film reaches the forming shoulder at constant tension, the pouch stays square, and the seal seam is never contaminated by a dust film that would reduce peel strength. Nitrogen flushing is available where residual oxygen must stay below two percent.

Cheese, whether sliced, grated or in blocks, needs the opposite treatment: minimum headspace, maximum barrier and a pack that survives cold chain handling. WILPAC builds vacuum and modified atmosphere formats for these products, with low impact loading, high barrier film structures and a controlled sealing window that keeps the seam intact through chilling and transport. Every dairy line can be completed with metal detection, check weighing and X-ray inspection, so a pack is verified by weight and by foreign body screening before it reaches the case packer. Coding and vision verification close the loop with lot level traceability, which dairy buyers increasingly require as a condition of supply.

For yogurt, drinking yogurt and fermented milk, WILPAC supplies spout pouch and premade pouch filling lines with hygienic stainless steel frames, IP65 washdown protection and drainable surfaces. Filling takes place in a temperature controlled enclosure to limit condensation, and CIP routines are programmed per product family to cut changeover time between plain, fruit and high acid recipes. Servo driven sealing keeps the same seam quality at low and high output, which matters because dairy runs are long and continuous rather than short and intermittent. From single machine upgrades to complete lines including case packing and palletising, WILPAC delivers the whole line from one engineering team, with commissioning, operator training and long term spare parts support.