Machine sewn seams may be folded fell or French fell type.

True

False

Question

Machine sewn seams may be folded fell or French fell type.

True

False

BlackTom AI · Accepted Answer

Fell seams (including the common flat‑felled) and French‑fell (French) seams are standard machine‑sewn seam types used to enclose raw edges and provide a neat, strong finish. Machines are fully capable of creating folded, fell, and French‑fell seams quickly and consistently.

1) Relevant knowledge points and concepts:
- Folded seam: fabric edges are folded before stitching so raw edges are hidden.  
- Flat‑felled seam: both raw edges are folded and topstitched, producing a very strong, flat finish (seen on jeans).  
- French seam: a two‑step seam where wrong sides are sewn together narrowly, then the assembly is turned and sewn again so raw edges are enclosed.  
- Machine sewing: modern sewing machines perform the necessary sequential stitches and topstitching to produce these seams efficiently.

2) Step‑by‑step reasoning:
- The statement says machine sewn seams may be folded, fell, or French fell. Each of these seam types is defined by folding and stitching techniques, not by exclusive hand methods.  
- Flat‑felled and French seams require sequential straight stitching operations and fold manipulation that sewing machines can and routinely do.

3) Intermediate steps (how machines make the seams):
- French seam: sew a narrow seam with wrong sides together (≈3mm), trim, press, fold so right sides are together, then sew a second seam (≈6–8mm) to encase raw edges. Both stitches are machine operations.  
- Flat‑felled seam: stitch wrong sides together, trim one seam allowance, fold the longer allowance over the trimmed one, press and topstitch through all layers—again all performed on a machine.

4) Why the correct answer is correct:
- The mechanical actions (stitching, folding, trimming, topstitching) required for these seams are standard machine capabilities; machines produce consistent, durable fell and French seams more quickly than hand sewing.

5) Why the other option (False) is incorrect:
- Claiming False would imply these seams cannot be machine sewn, which is incorrect because industry practice and standard sewing technique use machines for folded, fell, and French seams.

6) Conclusion:
- Therefore the statement is True, matching the provided answer.

Machine sewn seams may be folded fell or French fell type. True False判断题

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