Slip sheets are thin sheets of fiberboard, plastic, or corrugated material used to move unit loads without a wooden pallet. They matter in logistics because they reduce weight, save space, and lower shipping costs when the warehouse has the right handling equipment. A forklift with a push-pull attachment grips the sheet tab, pulls the load onto a platen, carries it, and then pushes it into place.
This system is common in export shipping, food and beverage distribution, and high-volume warehouses where cube utilization is critical.
A slip sheet works because the load is stacked tightly on a flat sheet with one or more protruding tabs for gripping. The push-pull attachment uses a clamping jaw, a sliding faceplate, and a platen to move the load while keeping the boxes supported. Compared with pallets, slip sheets can increase trailer or container capacity, but they require careful unitizing, smooth floor conditions, and trained operators.
Good system design includes load stability checks, tab orientation, sheet material choice, and clear procedures for receiving facilities that may not have push-pull equipment.
Key Facts
- Slip sheet thickness is often about 0.6 mm to 2 mm, far thinner than a standard pallet.
- Typical weight saving: load with slip sheet = product weight + sheet weight, not product weight + 15 kg to 25 kg pallet weight.
- Cube utilization gain = space saved by removing pallet height from each stacked unit load.
- Push-pull cycle: clamp tab, pull load onto platen, transport, push load off platen.
- Friction matters: too little friction can cause load shifting, while too much friction can tear the tab or overload the attachment.
- Total load weight must stay within forklift capacity: W_total = W_goods + W_sheet + W_attachment effect.
Vocabulary
- Slip sheet
- A thin handling sheet placed under a unit load so the load can be moved without a pallet.
- Push-pull attachment
- A forklift attachment that grips a slip sheet tab, pulls the load onto a platen, and pushes it off at the destination.
- Platen
- A thin flat metal platform on a push-pull attachment that slides under and supports the slip-sheeted load during handling.
- Unit load
- A group of items arranged and secured so they can be handled as one shipping or storage unit.
- Tab
- The projecting edge of a slip sheet that the push-pull clamp grips to move the load.
Common Mistakes to Avoid
- Using slip sheets with ordinary forks only, which is wrong because the sheet tab must be gripped and pulled by a push-pull attachment for reliable handling.
- Ignoring the receiving facility's equipment, which is wrong because a customer without push-pull capability may be unable to unload the shipment efficiently.
- Choosing a sheet material only by cost, which is wrong because moisture, load weight, surface friction, and tab strength determine whether the sheet will survive handling.
- Stacking boxes loosely on the sheet, which is wrong because slip-sheet loads need tight patterns, wrapping, or strapping to resist sliding during pull, travel, and push-off.
Practice Questions
- 1 A shipment has 40 unit loads. Each wooden pallet weighs 20 kg, and each slip sheet weighs 1 kg. How many kilograms of tare weight are saved by using slip sheets instead of pallets?
- 2 A trailer can carry 26 palletized loads. Removing pallets allows 2 extra slip-sheeted loads to fit. If each load contains 900 kg of product, how many additional kilograms of product can the trailer carry?
- 3 A warehouse wants to switch from pallets to slip sheets for export orders. Explain three conditions that must be checked before making the change, including equipment, load stability, and the receiving site.