Start With Core Inner Diameter, Not Speed

The first question in any tape packing machine selection is not how fast the machine runs. It is the inner diameter of the paper core your tape is wound on. We build two single-roll shrink-wrapping lines that look similar on the outside but are split by core ID, and mixing them up is the most common mistake we see in incoming inquiries.

The SD-60SS handles cores of 38–42 mm. That covers standard electrical tape and most general-purpose PVC tape. The SD-77HM is built for 76 mm cores only — 38 mm and 56 mm will not seat on its mandrel. These are not a low-end and a high-end pair. They are two separate paths divided by core size, and there is no “upgrade” from one to the other; picking the wrong core size means the roll simply will not load.

If your line runs mixed core sizes, the SD-920HM wraps 76 mm as its main size and also accepts 56 mm and 38 mm cores. It runs in packs (several rolls wrapped together) rather than one roll at a time, which uses a different throughput unit — covered below.

Single Roll vs Multi-Roll Throughput

Speed is quoted in different units depending on the machine, and the unit matters more than the number. Single-roll machines are rated in rolls per minute. The SD-60SS runs 0–65 rolls/min. The SD-77HM runs 0–55 rolls/min. Note that the SD-77HM carries “high speed” in its model name, but its rated speed is actually lower than the SD-60SS — do not read the name as a speed upgrade.

Multi-roll machines are rated in packs per minute, where one pack holds several rolls side by side. The SD-920HM runs 0–50 packs/min. A pack and a single roll are not the same unit, so 50 packs/min cannot be lined up against 65 rolls/min. Decide first whether your product leaves the line as individual rolls or as bundled packs, then read the speed in the matching unit.

Where the Packer Sits on Your Line

A packing machine is rarely the first station. On a typical tape line the order is: mother roll coating or slitting → rewinding → cutting to width → shrink packaging → sleeve labeling → carton erecting and sealing → palletizing. The packer sits right after cutting. If you are still preparing cores in-house, the upstream step is a dedicated paper pipe cutter; the SD-F001 four-axis paper pipe cutter sizes cores to the exact inner diameter your tapes need before they reach the wrapping station, so the packer never waits on a wrong-sized core.

Pick the Right Shrink Tunnel

The wrapper seals center-folded film around the roll; a separate shrink tunnel pulls it tight with heated air. Two tunnels fit the same wrappers. The SD-4020 is the economical unit: single-frequency drive, about 9 kW, no insulation blanket, lower purchase cost, and the area around it runs warmer. The SD-4522 is the energy-saving unit: dual-frequency drive, about 6 kW, insulated walls, cooler surroundings, higher cost. For most plants a wrapper such as the SD-1060 or SD-BL450 can pair with either tunnel; if budget is tight, the SD-4522 in the line can be swapped for an SD-4020 without changing the wrapper.

Film and Roll Size Limits

Both single-roll wrappers use center-folded PVC or POF shrink film. Roll outer diameter up to about 100 mm on the SD-60SS and SD-77HM; check the mandrel length against your tape width before ordering so the knife does not overtravel. The SD-920HM takes wider packs because it wraps multiple rolls side by side, which also changes the film width you stock.

What We Build In

Every unit ships with CE marking and light-curtain guarding on the access points, so the line stops if a hand crosses the beam. Installation is done over a video call — a typical line is running the same day, with debugging finished within one to three days, no engineer on a plane. We have machines from a 2019 batch still running two shifts seven years later without a major rebuild.

A Malaysian customer running our line reported a 20% increase in output, a 30% drop in labor cost, and a 19% reduction in defect rate after switching from manual packing to an automated wrapper and tunnel. We quote that as one customer’s result on one line, not an average across all installations.

Before You Send an Inquiry

Know three numbers: core inner diameter, target rolls or packs per minute, and how the packer connects to your existing cutter and tunnel. With those, we can match you to the SD-60SS, SD-77HM, or SD-920HM and the right shrink tunnel without a trial-and-error order. If you are not sure which core size your tape uses, send a photo of the core end and we will confirm the model before you buy.