1 Scope
This standard specifies the light conditions and appearance inspection methods for appearance inspection of special industrial silk. This standard is applicable to the appearance inspection of special industrial silk.
2 Light conditions for appearance inspection
The normal natural light shall be used during the inspection, and the northern light shall prevail to avoid direct sunlight. When the light is insufficient, two 40W fluorescent lamps with white cover can be used, and the light source is 0.9m away from the table.
3 Appearance inspection method
The appearance shall be inspected piece by piece. According to the fabric characteristics and use requirements, there are two inspection methods: A and B. Type A is the inspection bench, and type B is the combination of inspection bench and blackboard roll inspection machine. The two inspection methods shall be selected according to the product quality requirements.
3.1 Type A test method
3.1.1 The inspection table is 90 cm high, 120 cm wide, and 150 cm long. The table top is black.
3.1.2 Spread the silk pieces evenly on the inspection table, and the inspector shall stand at the side of the light source, and conduct the inspection page by page along the weft.
3.2 Test method B
3.2.1 The height of the blackboard checker is 185 cm, the width of the blackboard is 120 cm, the slope is 60 °, and the surface of the blackboard is black.
3.2.2 The silk pieces that have been inspected according to the Class A inspection method shall be inspected along the warp direction by the blackboard coiler, and wound on the paper tube.
3.2.3 The linear speed of the blackboard machine shall be 10 m/min.
3.3 Defect marking, shearing or false shearing
3.3.1 Defect marking
In case of any defect that should be marked during inspection, hang it on the silk edge with white thread as a mark.
3.3.2 Open shear or false open shear
During appearance inspection, in case of defects beyond the scope of defects, the shearing or false shearing shall be carried out according to the use requirements. If false slitting is used, the colored thread shall be hung on the silk edge as a mark.
3.4 Width measurement
Silk pieces shall be spread out in full width on the inspection table and gently trowelled. The width of each piece shall be measured three times at the middle of each piece and above 5m from both ends. It shall be measured five times in case of coupling. measure accurate To 0.1 cm, the measurement results are expressed as arithmetic mean. The average is calculated to 0.01cm Rounded to 0.1 cm. If the width measurement result does not meet the standard, the average of 10 points can be re measured, and the average of 10 times is the final result.
3.5 Measurement of tight and loose edges
Place the silk flat on the inspection table, use a 1Q0 cm measuring ruler to measure once in the longitudinal direction in the middle of the silk web, and then measure once at the same edge. The shortened size is the edge tight and middle loose value.
3.6 Inclination survey
The silk shall be placed flat on the inspection table, smoothed and straightened, and one right angle edge of the angle ruler shall be parallel to the warp, and the other straight angle edge shall be perpendicular to the warp, and the right angle vertex shall be aligned
For the selected weft yarn, measure the vertical distance between the selected weft yarn and another right angle side. The percentage of the ratio of the distance to the amplitude is the weft skew.
3.7 Length measurement
When the finished product is folded to 1m, the length shall be measured first. The measurement shall be carried out three times in the middle of each horse and more than 3m from both ends, and the measurement accuracy shall be 0.1 cm. The measurement results shall be expressed in arithmetic mean. The average is calculated to 0.01 cm and rounded to 0.1 cm. Then count the number of folds and measure the remaining part less than 1 fold, and calculate it according to the following formula:
L=L₀×n+L₁
Where: L -- length of each piece, m
L —— Actual folding length, m; number of folds
L₁ —— Less than 1 fold in length, m。
If the blackboard machine is used for packaging, the reading of the length gauge shall be taken as the length result.
Explanation of appearance defect terms
A1 Lack of warp: a warp on the silk surface is partially broken, showing a thin thin path.
A2 Lack of weft: a weft on the silk surface is partially broken, showing a thin thin path.
A3 cross lay: several warp wires are rolled together during weaving, resulting in tension change, which makes the silk surface appear uneven along the warp direction.
A4 wide sharp warp: if the tension of single or multiple warp wires is too small or too large, the warp direction of the silk surface will show slack lines or tighten straight bright wires.
A5 weft shrinkage: the weft on the silk surface is uneven, with small grains in buckling shape.
A6 Elastic rung: The weft density suddenly increases or decreases, and the silk surface presents loose or tight rungs.
A7 Removal of lint band: the warp is damaged when the silk is removed, and there is one or partial fuzz band on the silk surface.
A8 filament block: A rough knot on the silk surface is formed due to the filaments on the silk strip.
A9 sharp winding: the tension of one or two weft wires is too large, and the silk surface shows the weft wire pulling and shining or the edge is blocked.
Rib winding: Rib shaped winding with discontinuous color or different shades on the silk surface due to uneven tension.
A10 weft stains on the shuttle box: the weft silk in weaving touches the shuttle box and stains it, forming intermittent and regular small segments of weft stains on the silk surface.
A11 spider web: two or more warp and weft yarns float on the silk surface, the weave points are damaged, and the silk surface presents floating warp and floating weft that are separated from the interlacing points.
A12: Jump pattern: Jump pattern: A piece of silk floats on the silk surface without interweaving according to the organization.
Star jump pattern: A warp and weft silk is floating on the silk surface without being woven into the fabric.
A13 Cut edge: the silk edge shows a little weft fracture.
A14 zigzag edge: the silk edge presents zigzag concave and convex.
A15 selvage: the weft on the silk edge is exposed in a small circle.
A16 side hole: the side hole is formed by cutting the warp and weft wires.
A17 Broken edge: broken warp or weft at the edge.
A18 warp and weft stains; Stains on warp or weft threads.
A19 Spots, spots, yellow stains, soap stains: the silk surface presents irregular multiple stains.
A20 rust spot: yellow rust spot on the silk surface.
A21 embossing: the silk surface presents disordered wrinkles.
Crease printing: The silk surface presents dark and light color stripe wrinkles. Wrinkle printing: The silk surface shows partial stripe aurora printing.
A22 Tight at the edges and loose at the middle: the tension of the silk at the edges is too large, and the silk surface has different edges and middle lengths.
A23 auricular edge: the tension of the edgewise wire is too small, forming a loose side like auricular.
A24 weft slant: the weft on the silk surface is slanted or curved.
A25 Uneven sheets: the silk in the same piece is wide and narrow.
A26 loose plate printing: the silk surface formed during dyeing and finishing shows the traces of wood grain.
A27 trumpet print: the silk surface formed during dyeing and finishing presents trumpet shaped crease print.
A28 Grey damage: the fiber is slightly damaged during scouring and finishing, and the silk surface shows regular block traces.
A29 Colored willow and colored rung: the silk surface presents various colored roads and rungs.
A30 dark and light head, dark and light edge, printing up and down, left and right depth, heavy board: the color of silk surface is different before and after, left and right.
A31 unclamp: when stenting and setting, the silk surface is partially concave in an arc without entering the cloth clip or needle plate.
A32 needle hole insertion: when finishing and shaping, the needle plate enters the inner part locally.
A33 Draping: warp or weft threads on the silk surface have local displacement, forming a dense and uneven block.
