Bundle Sleeve Shrinking Machine

Executive summary Our SK sleeve shrinking machines feed, wrap, seal, shrink and cool a bundle of products in one automatic line, with or without a tray underneath. We choose the model by the largest bundle: from 280 × 180 × 150 mm on the SK-060ABS up to 420 × 350 × 300 mm on the SK-080B. A quick check is that the film width should cover the bundle width plus its height.

Table of Contents

How sleeve shrinking works

  1. Feed. The infeed conveyor groups the products into a bundle.
  2. Wrap. The bundle pushes into a curtain of PE film, so film covers the front, the top and the bottom. The back is covered when the seal bar closes behind the bundle.
  3. Seal. A sealing knife with an anti-stick coating seals and cuts the film behind the bundle.
  4. Shrink. The bundle runs through the tunnel, where two fans spread the heat, and the film tightens with open “bullseye” ends at the sides.
  5. Cool. A strong fan cools the film at the tunnel exit so the bundle holds its shape.

In our video, the stacked packs keep their shape as they enter the film curtain. The shrunk film leaves open ends on both sides, and the bundle needs no tray.

Automatic sleeve shrink bundling machine with film sealer and heat shrink tunnel
Sleeve shrink bundling machine. The sealer wraps the bundle in film and the tunnel shrinks it.

Which SK model fits

Model Max bundle (L × W × H) Max film width Packs per minute Power
SK-060ABS 280 × 180 × 150 mm 350 mm 10–20 up to 8 kW
SK-075C 380 × 200 × 200 mm 500 mm 8–18 up to 12 kW
SK-080A 420 × 300 × 300 mm 600 mm 8–18 up to 20.5 kW
SK-080B 420 × 350 × 300 mm 600 mm 8–18 up to 20.5 kW

For bundles longer than these, the SK-080E takes film up to 1,000 mm wide, and its output depends on product length.

Film width and film per pack

The film has to cover the bundle width and run up both sides to form the open ends, so the film width should be about the bundle width plus its height. The model table follows this rule:

Model W + H Max film width
SK-060ABS 180 + 150 = 330 mm 350 mm
SK-075C 200 + 200 = 400 mm 500 mm
SK-080A 300 + 300 = 600 mm 600 mm
SK-080B 350 + 300 = 650 mm 600 mm

The SK-080B is the exception: its largest width and largest height add up to more than its 600 mm film. At the full 350 mm width, the bundle height should stay at about 250 mm or less, so a bundle cannot be at the largest width and height at once.

The cut length of film per pack is about twice the sum of length and height, because the film covers the top, the bottom, the front and the back. Illustrative example for a stack of bags 400 × 300 × 250 mm:

Check Calculation Result
Film width 300 + 250 550 mm, so SK-080A or SK-080B
Film per pack 2 × (400 + 250) about 1,300 mm
Film per hour at 18 packs/min 1.3 m × 18 × 60 about 1,400 m

We confirm film width and cut length on a sample of your bundle.

Output and power

At 8–18 packs per minute, the SK-080A bundles 480–1,080 packs per hour. Most of the power goes to the tunnel heaters, so the larger tunnel on the SK-080A draws up to 20.5 kW against 8 kW on the SK-060ABS.

Packing forms

The machine packs two, three or four lanes, with or without a tray underneath, and changing the packing form is a switch setting. Feed fixtures are chosen to suit the product shape, and the infeed can be on the right or the left. With printed film, a colour-mark system positions the print on each pack.

Utilities and safety

Utility SK-080A
Power supply 380 V, 50–60 Hz, 3-phase
Air pressure 0.5 MPa (5 bar), as listed
Working height 850–900 mm
Tunnel 1,800 mm long, entrance 600 × 400 mm
Weight 1,050 kg

Conveyor speed is set by inverter, and a roller table can be added at the tunnel exit so packs do not fall. The standards that apply depend on the destination market. For CE markets, ISO 12100 sets the risk-assessment method and EN 415-10 sets general requirements for packaging machines.

Selection checklist for a sleeve shrink bundler

  • Largest bundle: length, width and height.
  • Number of lanes and items per bundle.
  • Tray or no tray.
  • Clear or printed film.
  • Packs per minute needed.
  • Power and compressed air.

Engineering FAQ

Q: How do we choose the film width? A: About the bundle width plus its height. For a 300 × 250 mm cross-section, about 550 mm.

Q: Which model takes the largest bundle? A: The SK-080B, up to 420 × 350 × 300 mm.

Q: How many packs per minute? A: 8–18 on the SK-075C, SK-080A and SK-080B; 10–20 on the SK-060ABS.

Q: Can it work as a trayless shrink bundler? A: Yes. The machine packs with or without a tray, and leaving out the tray saves material when the stack holds its shape.

Q: How much power does it draw? A: Up to 8 kW on the SK-060ABS and up to 20.5 kW on the SK-080A.

Next step

We plan your sleeve shrink bundler in three steps:

  1. Submit your layout drawing with bundle sizes and packs per minute to info@fhopepack.com.
  2. Receive a proposal within 48 hours, with the model and film width.
  3. Book a site survey to plan infeed and outfeed.

Sources

Last reviewed: 2026-10-04

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