On a leather jacket, the seam-opening step is short but exposed. The pieces are already stitched; what remains is to open the seam allowance and press it flat along the join. It is the kind of operation that has normally been done at an iron, by an operator who reads heat and pressure by feel and judges the result by looking at the surface of the leather afterwards.

That step is now also done by equipment. The XST-235-7H1, developed by Dressed Santo for leather garment production, handles both halves of the operation: the allowance is opened, then flattened against a heated surface whose temperature is set at the panel. Nothing in the pass puts moisture into the leather.

Inside the Pass: Seam Opening, Temperature and Speed

Two operations that are usually separate are combined at this station. The manufacturer lists automatic seam opening, steam-free pressing and precision temperature control among the design features of the model. The third of these is what makes the first two useful together: on leather, temperature is a setting that follows the material being fed rather than a value decided once and left alone.

Three figures describe how the pass is run, and each answers a question a workshop will ask. Speed can be adjusted around a rated 100 mm/s, so a short run or a curved section can be taken at a slower pace. Width covers seam and edge measurements between 5 mm and 20 mm. And the stroke does not break partway: a full-length seam is completed in one movement rather than in segments separated by a waiting cycle.

The drive is specified as two servo motors of 100 W each, with the machine rated at 280 W in total. The manufacturer's own figure for learning to run it is about three minutes.

Why the Seam on Leather Is Not a Speed Question

In steam pressing, heat arrives with moisture, and the moisture does not leave with it. On leather the consequence is not hidden. The manufacturer gives one set of reasons for keeping steam out of this operation altogether: preventing deformation and discoloration. A leather panel has no later layer to be covered with, and its surface is the part a buyer sees and handles, so anything that reaches it during the pass becomes part of the finished appearance.

That changes what a factory should compare. The useful question at this station is not how many pieces a pass can put through in an hour, but whether the pass can be run steam-free, with no water reaching the leather, and whether temperature can be set to suit the material actually being fed.

Where It Is Designed to Work, and Where It Stops

The applications set out for this model are leather garment seams. The manufacturer's materials show the pass running along a leather strip and a finished leather jacket, and seam opening for leather garments is the operation the machine is built around. It is a finishing station: the seam arrives already stitched, and the machine neither joins pieces nor sews.

Two boundaries are worth stating. Width fixes what the station accepts, so a style whose seams measure outside 5-20 mm is not a job for this machine. And no machine can know whether a particular leather suits the process: temperature is adjustable, but the number to dial in for a given delivery is a matter of trial rather than assumption.

What Has to Be in Place Before the Station Changes

No station runs on nothing, and this one runs on air and electricity rather than on a boiler with a water supply. Shop air is specified at 0.6-0.7 MPa. Power comes from a single-phase supply of AC 220V ±10% at 50/60 Hz. A workshop whose air line already reaches the finishing position is making a connection; a workshop without one is taking on a compressor and air preparation as well as the machine. That belongs in the decision before the equipment comparison, not after it.

Three items settle most of the uncertainty around the operation itself. The first is fit: whether the seams in the styles now in production measure within the range the station accepts. The second is the temperature setting for each leather to be run. The third is a sample pass on the leather the factory actually buys, because a value that held on a supplier's swatch is not evidence about next month's delivery.

Conclusion

The XST-235-7H1 does not change what seam opening is. It changes who performs it and what the station depends on. The operation moves from an iron in an operator's hands to a machine pass with a set temperature, a set width and a rated speed, while the steam and the boiler leave the finishing area and compressed air arrives in their place. For leather garment production, where the surface of the material is the visible result, that exchange is the part worth evaluating: whether the seams a factory actually runs fall inside the machine's range, and whether its settings can be established and repeated on the factory's own leathers.