What unwind direction and core size do I need for roll labels?

What do roll label unwind Positions 1 through 8 mean?

Every commercial label converter and applicator manufacturer uses the same eight-position unwind chart. To read the chart, hold the roll in front of you with the web feeding downward or forward toward your applicator's peel plate. Positions 1 through 4 are Wind Out, meaning the printed labels sit on the outside surface of the roll where you can see them before peeling. Positions 5 through 8 are Wind In, meaning the labels face inward toward the cardboard tube and only become visible as the web unrolls. Within each group of four, the number identifies which edge of your artwork exits the roll first as the liner advances. Choosing the right number ensures your text and barcode land right-side up on the container instead of upside down or sideways.

Which unwind direction do bottle rollers vs flat pouch applicators use?

The easiest way to pick between Positions 1–2 and Positions 3–4 is to look at how your container moves past the peel edge. On a semi-automatic bottle roller or inline wrap-around conveyor, a round glass jar, dropper bottle or beverage can rotates around its vertical axis while the label feeds horizontally across its wall. Because the side edge of the label must touch the cylinder first and pull the rest of the wrap around the curve, horizontal bottle machines almost always require Wind Out Position 3 (right edge leading) or Position 4 (left edge leading). By contrast, flat-surface applicators and manual tabletop pull dispensers feed the label vertically toward the operator or downward onto a flat pouch or box lid. For custom coffee bag labels or box closure seals, Position 1 (top edge leading) or Position 2 (bottom edge leading) presents the label upright as you pull it off the separator bar.

1. Position 3 (right edge leading): most common setting for tabletop bottle rollers and left-to-right conveyor wrap lines.
2. Position 4 (left edge leading): used when the bottle spins in the opposite direction or feeds right-to-left.
3. Position 1 or 2 (top or bottom leading): preferred for flat pouches, jar lids, boxes and manual bench dispensers.

Should I choose a 1 inch or 3 inch core diameter, and what is max outer diameter?

Inside core diameter is the opening of the rigid cardboard tube at the center of the roll, and maximum outer roll diameter (OD) is the total width across the outside of a full roll of labels. Commercial semi-automatic bottle rollers, rotary inline machines and heavy-duty bench dispensers standardize on a 3 inch core diameter. A 3 inch core also keeps the innermost 100 labels on the roll much flatter than a tight 1 inch core, which prevents memory curl when labeling narrow 1 oz dropper vials or lip balm tubes. Always check your machine's maximum outer roll diameter before ordering large runs. While floor-standing inline machines easily hold 8 inch to 12 inch OD rolls so operators reload less often, compact tabletop rollers and desktop dispensers often sit close to the table frame and max out at a 5 inch to 8 inch outer diameter. If a roll is wound too wide for a compact frame, the bottom of the roll drags against the machine base and creates web tension spikes that skew labels on the bottle. Note both your core size and max OD in Step 2 of your printed roll labels quote so we split your quantity across the right number of rolls and wind each SKU onto its own clearly labeled tube.

Why does swapping width and height rotate your artwork on the roll?

When you measure a container for custom bottle labels or custom jar labels, measure only the straight vertical wall between the top shoulder curve and the bottom base curve, then subtract ¼ inch so the label never bridges onto curved glass. For a full wrap around a cylinder, multiply the diameter by 3.1416 (π) and subtract ¼ inch (0.25 in) so the two meeting ends leave a clean seam gap without overlapping. When entering those two measurements into a roll quote, keep track of which dimension is the horizontal width and which is the vertical height of your artwork. Suppose your bottle wrap reads 2 inches tall by 4 inches wide around the cylinder. In Position 3 or Position 4, the 2 inch height sits across the width of the liner web while the 4 inch wrap length feeds along the running direction of the roll. If width and height are accidentally swapped without matching the unwind number, the press will wind the 4 inch dimension across the liner and your labels will feed sideways onto the bottle. Because every CubitPack order includes a free digital proof and 3D mockup before payment, our prepress specialists verify your artwork orientation against your chosen unwind number before plates or dies are set.

1. Straight wall height: measure between neck and heel tapers and subtract ¼ inch total clearance.
2. Full cylinder wrap width: (π × container diameter) minus ¼ inch seam gap.
3. Sensor gap along the liner: standard ⅛ inch (0.125 in) spacing between labels for optical and ultrasonic gap sensors.
4. Free digital proof check: our prepress team marks the unwind position and leading edge on your proof before payment.

What are the most common roll label unwind and core mistakes?

Specifying the wrong wind direction or core size can stall a bottling day before the first case is packed. Watch out for these five errors

1. Ordering Position 1 (top edge leading) for a horizontal bottle roller that actually requires Position 3 (right edge leading) or Position 4 (left edge leading).
2. Requesting a 1 inch core for a commercial labeling machine that has a fixed 3 inch mandrel spindle.
3. Forgetting to check maximum outer roll diameter (OD), resulting in jumbo rolls that rub against the base plate of a compact tabletop applicator.
4. Confusing Wind Out (labels on the outside of the roll, Positions 1–4) with Wind In (labels on the inside of the roll, Positions 5–8).
5. Wrapping 100 percent of a glass jar's circumference with zero gap, which causes the ends to overlap when glass container diameters vary slightly.

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