The machine number of the warp knitting machine is expr […]
The machine number of the warp knitting machine is expressed by the number of stitches per unit length of the needle bed.
Where: E - machine number;
T——needle distance, mm;
L - unit length, inch inch (25.4mm).
The definition of the warp knitting machine number is the same as that of the weft knitting machine, but it differs in the selection of the length unit. For different warp knitting machines, the specified lengths on the needle bed are as follows.
(1) 1 inch (25.4 mm): A method commonly used in modern warp knitting machines, Example E28, which is 28 needles per inch.
(2) 30mm: Domestic Z303 type adopts 30mm, such as 32 needles/30mm, 24 needles/30mm.
(3) 1 inch (German, 23.6mm): Used by old machines, it is no longer used.
(4) 25mm: used on the stitching machine, generally indicated by F, for example 12F, ie 12 stitches / 25mm.
(5) Pipe knitting machines are generally expressed by pipe pitch, for example 3mm, 5mm, 7mm, 10mm.
(6) On the Raschel warp knitting machine, the number of the needle is expressed by the number of needles of 2 inches, that is, the number of needles in the needle bed of 50.8 mm is used as the machine number, and is represented by ER, for example, ER32. Now start using the number of stitches of 1 inch, for example, if the machine number is 24, write it as E24.
The number of the multi-comb warp knitting machine is generally E14, E18, E24, and the machine number of MRE32/24SU is E28. The Jacco warp knitting machine's machine numbers are sometimes expressed as E6/12, E7/14, E9/18 and E12/24, which means that the machine is fully equipped with the machine number configuration, and the Jacquard card is configured with the half machine number. In the RJWB series, the machine number is expressed as E24/12, which means that the machine is fully equipped with the machine number configuration, and the Jacquard card is configured with the half machine number. In addition, the machine number is related to the product use. Generally, E14 and E18 are used to produce curtains and tablecloths, and E18 and E24 are used to produce mesh fabrics for lace and clothing.
The fineness of the machined yarn of a certain machine is mainly determined by the yarn gap between the needle and the sinker (or the knock-off comb), the yarn capacity and the bearing capacity of the hook, and also with the yarn. Bulkiness is related to the degree of hairiness and in many cases is determined by actual testing. The yarn gap Δ(mm) between the needle and the sinker can be calculated as follows:
Where: a - the thickness of the needle, mm;
B——the thickness of the sinker, mm;
T - stitch length, mm.