For these reasons, great attention is paid to chemical and technological control
yarns and fabrics, bearing in mind the type of various defects and always having
both the obvious ones - that is, that can be seen and appreciated with
the normal diligence of the operator - that those hidden, which may manifest themselves -
re only after use or after a certain period of time.
Controls on chemical yarns and fabrics concern the following aspects:
to. recognition of qualitative and quantitative fibers, on yarns and on
fabrics;
b. color uniformity on the fabric;
c. degree of color fastness (resistance) to both artificial light
than daytime, to the various types of sweat, to the various types of water
(rain, sea, etc.), fulling, rubbing, etc.
d. degree of impermeability;
is. flammability;
f. breathability;
g. dimensional stability of the fabric to various types of washing.
The most significant technological controls concern:
to. length and fineness of the fibers;
b. twists and count of the yarn;
c. regularity of the yarn section and any impurities;
d. dynamometric resistance of the yarn and fabric;
is. weight per square or linear meter and height of the fabric;
f. burst resistance for knitted fabrics;
g. weaving of traditional and knitted fabrics;
h. resistance to sliding of the seams (before or on the garment
packaged);
the. wear and pilling resistance of fabrics;
j. number of burrs on continuous burr synthetic yarns.

The analyzes for the research of the indicated defects are just some examples of the most recurrent
checks that are carried out on both classic and knitted fabrics. It is clear that for special fabrics intended
born for particular uses or for specific defect research, other types of analysis are envisaged.