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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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30.1 Cardigan

The front part of a cardigan consists of two halves, each of which is composed of a body and a strip. The strip is the part where the buttons or the buttonholes are (depending on the side) and it is woven in such a way that it is more consistent and stronger than the body.
Traditionally, body and strip are woven separately and then sewn together, but nowadays there are machines that weave simultaneously body and strip as a single part, the advantage being that operations during the manufacture of the garment are eliminated. The drawback is that since the strip has a different stitch and is woven under other parameters, it sometimes ends up being longer or shorter than the body, resulting in a defective part.
To determine the weaving conditions for the strip that guarantee that the length of body and strip are the same, a 23 design is carried out with the following factors:
A: Type of strip: Interlock (–) and tubular (+)
B: Number of needles: 4 and 10
C: Graduation of the stitch (length of the mesh in the interior part): 9.0 and 10.8
The following results are obtained, in the standard order of the design matrix:
Unnumbered Table
The objective is to determine the weaving conditions such that the time and the difference between body and strip length are minimized. It is ...

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