Butcher Paper, Perforated Tray or Pad: A Twelve-Case Run on Pork Shoulder

We ran the test in a 40 m³ chiller at 2 °C with twelve 20 kg cases of bone-in pork shoulder from a single lot, four cases on each of three methods: polyethylene-coated butcher paper, a perforated polypropylene tray over a drip pan, and a 400 gsm three-layer absorbent pad in a solid tray. Same air temperature, same stacking, same 26-hour thaw. The results were not close, and one of them was a surprise.

Most plants pick between these methods on price per unit, which is the least informative number available. This article reports what the twelve cases showed, converts each method to a cost per hundred kilos thawed, and sets out which line each method actually suits.

The Test Setup and What We Measured

Each case carried a 3.4 percent drip expectation, which is 680 millilitres per 20 kg case. We weighed the collection at hours 6, 12, 18 and 26, recorded product surface condition, and photographed the base of each case at the end. We also recorded the time each method added to the pack-out.

• Butcher paper, 40 gsm PE-coated, wrapped loosely and taped.
• Perforated PP tray, 4 mm holes at 30 mm centres, sitting in a 20 mm drip pan.
• Absorbent pad, 400 gsm, three-layer, cut to 540 by 340 mm in a solid 600 by 400 mm tray.

Where Each Method Fails

Butcher paper held liquid until hour 12 and then passed it. Coated paper is a barrier, not an absorbent, so the 680 millilitres pooled in the folds and eventually found the seams. At hour 26 all four paper-wrapped cases had wet bases and the product showed paper marking on the contact face, which cost two cases their premium grading. Paper also added 55 seconds per case at pack-out.

Perforated trays drained well, which is what they are designed to do. The surprise was that draining is not drying: liquid sat in the drip pan 15 mm deep, the product sat in vapour-saturated air directly above it, and surface colour on the lower face was measurably paler. The tray stack also became unstable once pans were wet and slid.

Pads held 610 to 660 millilitres of the 680 in all four cases, with the remainder retained in the tray corners where it dried overnight. No product marking, no base wetness, and 18 seconds per case at pack-out.

Cost Per Hundred Kilos, Including Labour

Unit price alone puts butcher paper cheapest at roughly 0.02 to 0.04 currency units per case, perforated trays at 0.15 to 0.25, and pads at 0.30 to 0.55 depending on grammage. Adding labour changes the ranking. At a loaded rate of 22 per hour, paper adds 55 seconds (0.34 per case), perforated trays 40 seconds (0.24), and pads 18 seconds (0.11).

Paper therefore lands at about 0.37 per case, perforated at 0.44, and pads at 0.50 to 0.66. Per hundred kilos, that is 1.85, 2.20 and 2.50 to 3.30. The gap narrows to almost nothing, and it reverses entirely if a single case per hundred is downgraded for paper marking, which at a 4 percent value loss on a 120 case wipes out the saving many times over.

Which Method Wins on Which Line

Butcher paper still earns its place where thaw is short and drip is low: whole muscle beef at 1.5 percent, thawed for eight hours, wrapped for protection rather than absorption. Perforated trays suit operations with a floor drain and a tilt, where the liquid leaving the tray is genuinely managed downstream and the pan is emptied on a schedule someone owns.

Pads win where the tray leaves the chiller with product in it, where drip is above 3 percent, or where product surface appearance carries a premium. That covers most pork, all poultry, and every fillet line.

The decision is not which material absorbs best. It is which method still works at hour twenty, when nobody is watching. Our SAP pad cores for case and tray thaw are the part of that method that keeps working overnight.