1. Selection of steel healds
The length of the steel healds is related to the requirements of the warp opening. Long healds are used for large openings, and short healds are used for small openings. The length can be determined according to
(2) The C-shaped heddle eye is located at the center of the heddle length, and can be in different positions as needed.
(3) The J-shaped and O-shaped heddle eye is located 5mm above the center of the heddle length. It can also be in different positions according to needs.
2. Selection of C-shaped and J-shaped single-row eccentric steel plate heddle eyes
(1) The shapes and sizes of C-shaped and J-shaped single-row eccentric steel plate heddle eyes are shown in Figure 7-6 and the table 7-5.
(2) The position of the CP-shaped steel heddle eye is in the center, and can also be in different positions according to needs.
(3) The position of the JP-shaped steel sheet heald eye is 5mm above the center of the heald body. It can also be in different positions according to needs.
(4) The position of the OP-shaped steel heddle eye is at the center, 5mm above the center or 10mm above the center.
3. Selection of steel sheet heald density
Steel sheet heald density refers to the number of steel sheet healds per cm on the drawing rod after the fabric is put on the machine. If the density of the steel sheet heald is too large, it will increase the friction between the steel sheet heald and the warp yarns; if the density is too small, it will increase the number of heald frames, causing a large difference in warp tension between the front and rear heald frames. At the same time, the sliding gap of the heddle lug in the heddle threading rod increases, resulting in accelerated wear of the heddle lug.
(1) For the selection of comprehensive density of C-shaped, J-shaped and O-shaped steel sheets, see Table 7-7.
4. Selection of steel healds
Select the type of steel healds according to the cross-section of the heald rod on the heald frame of the loom.
Figure 7-8 Heddle penetration rod is mainly suitable for C-shaped single row and double row steel sheet healds.
Figure 7-9 Heddle penetration rod is mainly suitable for J-shaped single row and double row steel sheet healds.
Figure 7-10 Heddle penetration rod is mainly suitable for closed single-row and double-row steel sheet healds.
5. Abnormal damage and causes of steel healds
(1) Heald eye wear is caused by sand or hard substances in the slurry.
(2) The heddle eye is strained and deformed because the heddle hook used when threading the warp yarn does not match the size of the heddle eye.
(3) Heald lug wear and breakage is caused by the uneven surface of the heddle rod or improper matching of the rounded corners and the arc of the heddle lug. The dimensional tolerance of the heddle rod is too large and exceeds the standard. The fit between the heddle rod and the heddle lug is too tight, or due to The heddle rod clamp falls off, and the heddle rod bends, causing the heddle ears to collide and wear.
(4)Steel sheetComprehensive deformation. The reason is improper operation during disassembly, transportation, cleaning and storage.
6. Weaving defects caused by defective steel heddles
(1) The heddle eyes are rough, straining the warp yarns, and in severe cases, causing warp breakage.
(2) The heald ears penetrate each other on the heald threading rod, which can easily cause menstruation.
(3) The steel sheet healds are of different sizes or bent, resulting in inflexible movement on the heald threading rods, resulting in streaks.
(4) The surface of the steel heald is not clean, and defects will occur on the cloth surface during weaving.
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