1.Definition of latitude: Usually refers to the […]
1.Definition of latitude:
Usually refers to the weft (coil) direction of the machine (needle) fabric, the yarn from the side perpendicular to the selvage causes one or several bending phenomena in the full width range.
In a broad sense, the weft also includes the presence of one or more bows on the full width of the pattern, such as the pattern, the strip, etc. in the processing steps such as printing, jacquard, embroidering, and gold-plating. The latter are sometimes referred to as flower skews. The test method is similar.we provide pocket fabric(pocketing fabric),you can know it.
2,the type of latitude: divided into bow, double bow, double hook bow, anti-double bow, hook bow and so on
Latitude = latitude / width * 100%
3.Determination of the latitude:
At the time of inspection, check each fabric for defects. When calculating the latitude, it is generally necessary to measure each time in the head, middle and tail of the cloth to reflect the change of the latitude in the longitudinal direction.
For each type of fabric, each factory forms its own method of operation according to its actual inspection conditions, and there is no clear plan. This should be improved as follows:
(1)The measurement should be carried out on the platform. Pay attention to the flat fabric and test the weft inclination without accidental tension to prevent the system error caused by the suspension measurement on the inspection vehicle.
For the new inspection vehicle, the gauge device is usually pressed and rotated on the cloth surface, and the fabric is blocked at the contact point to form a zonal arch.
Although, in some traditional cloth inspection machines, the length of the spindle rotation will be slightly better, but the weight of the cloth will form a natural weft bow, and the degree of bowing will vary depending on the type of cloth and the running speed of the cloth. The test is evenly tested and the test is performed on the inspection machine. The difference between the two is between 0.8% and 1.5%.
(2)The latitude and longitude of the cloth surface and the obvious yarn path should be used as much as possible. Although tearing or drawing is a common method, one can only perform a mid-weft bow that lacks cloth at both ends and lacks representativeness;
Second, the limited variety can not be promoted. For example, the drawing method can only be applied to the cloth in the form of loose structure, and the tearing method can only be carried out on the cloth with low tearing strength, and this method will affect the original distribution pattern of the weft yarn in the tearing triangle. .
Some garment factories take alignment on the cutting table (see the side of the table perpendicular to the edge of the cloth) to observe the skew of the actual weft (yarn circle). This method is also more suitable.
In addition, the weft can also be measured from the reverse side, whichever is clear. However, the double sided fabric must be based on the agreed front.
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