The main parameters to check when sewing multi-layer FIBC bag seams and thick webbing are maximum stitch length, needle penetration, presser-foot clearance, needle size and motor output. Multi-layer PP woven fabric, folded seams, lifting webbing and reinforced joints demand a machine that can penetrate many layers at once while keeping a long, strong stitch. The DS9800 is configured around 0–14 mm stitch length, 800–1000 stitches/min and a 210 × 420 mm presser foot lift area.
FIBC Body Fabric
FIBC body fabric is heavy woven polypropylene, often 160–220 g/m² per layer. When several panels overlap at a seam, the combined thickness rises sharply, so the machine must deliver steady torque and penetration.
Folded Seams
FIBC seams are usually folded before stitching to add strength. A folded seam triples the effective thickness in a narrow band, requiring a long stitch and high presser-foot clearance so the fabric does not jam.
Lifting Webbing
Lifting loops and webbing are the strongest parts of a jumbo bag and can be several millimetres thick. Sewing through webbing demands heavy needles (7×230 / 7×250 / 7×300) and enough motor power to keep the needle moving.
Multi-Layer Joints
Where the body meets the top hem and the lifting loops, multiple layers converge. This is the most demanding point and the main reason a standard machine fails on FIBC production.
Needle Penetration and Stitch Length
Needle penetration and stitch length work together. A long stitch length (0–14 mm on the DS9800) reduces the number of penetrations per metre, lowering needle heat and seam stress, while correct needle size ensures clean penetration through thick webbing.
Parameter Reference Table
| Buyer Concern |
Parameter to Check |
DS9800 |
| Multi-layer sewing |
Max stitch length |
0–14 mm |
| Continuous production |
Sewing speed |
800–1000 stitches/min |
| Thick seam clearance |
Presser foot lift |
210 × 420 mm |
| Needle compatibility |
Needle size |
7×230 / 7×250 / 7×300 |
| Motor output |
Motor |
550 W |
FAQ
How many layers can be sewn in one pass?
With a 210 × 420 mm presser foot lift area and a 0–14 mm stitch, multiple overlapping layers of PP fabric plus webbing can pass in one pass.
Which needle size suits thick webbing?
7×250 and 7×300 needles are typically used for the thickest webbing and multi-layer joints.
Why is stitch length important for thick seams?
A longer stitch reduces penetrations per metre, lowering needle heat and seam stress on heavy fabric.
Is 800–1000 stitches/min too fast for thick material?
The DS9800 pairs this speed with a 550 W motor and long stitch length, so it sustains speed without stalling in thick seams.
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