In jumbo bag sewing, frequent bobbin replacement can interrupt continuous production, especially when sewing long seams or multiple layers. The DS9800 uses a large shuttle hook and double-bobbin thread capacity to extend sewing time between bobbin changes.

The Problem: Constant Bobbin Changes

When sewing FIBC and jumbo bags, operators often face long, uninterrupted seams, sometimes several metres of folded PP woven fabric at a time. Standard bobbins hold only a small amount of thread, so the operator must stop, cut the thread, replace the bobbin and re-start the seam. Each stop breaks rhythm and, over a shift, dozens of stops add up to significant lost time.

Why Bobbin Changes Matter to Efficiency

A bobbin change is not just a few seconds of thread. It involves stopping the machine, lifting the presser foot, releasing the fabric, threading the new bobbin and re-aligning the seam. On long jumbo bag seams, every change risks an inconsistent stitch at the restart point and slows the whole production line. Reducing the number of changes directly increases output per shift and improves seam consistency.

How a Large Shuttle Hook Works

A large shuttle hook holds a physically larger bobbin, so it carries more under-thread per fill. Combined with double-bobbin thread capacity, the machine can sew far longer before the under-thread runs out. Instead of changing the bobbin several times per bag, the operator can complete extended seam runs in a single pass, keeping the production flow continuous.

Suitable Sewing Conditions

• Long continuous seams on FIBC and jumbo bag bodies
• Multi-layer folded seams and reinforced joints
• High-volume production lines where downtime is costly
• Thick PP woven fabric and heavy webbing

DS9800 Configuration

FAQ

How often do I still need to change the bobbin?
The large shuttle hook and double-bobbin capacity extend runtime significantly, so changes are far less frequent than on a standard machine.

Does a large shuttle hook affect stitch quality?
No. Consistent under-thread tension across long seams helps maintain even, reliable stitches.

Is this setup suitable for repair work?
It is mainly intended for continuous FIBC production; repair and supplementary stitching are covered by models such as the GB6-180-2.

Can it sew multi-layer jumbo bag fabric?
Yes. Combined with a 210 × 420 mm presser foot lift area and long stitch length, it handles multi-layer seams.

What motor powers the DS9800?
A 550 W motor drives the machine at 800–1000 stitches/min for continuous heavy-duty sewing.