Three-line sweater machine when using polyester and cotton woven fabric covering effect, transfer machine should pay attention to what the problem in order to ensure good coverage?
1. Cause Analysis
On the third line sweater knitting machine veil covering the ground yarn fabrics are special fabrics, machine commissioning requirements are relatively high, in theory, it belongs to the one-sided coverage Tim yarn organization, but also with a single circular knitting machine knitting yarn Tim there are differences between the process of covering the organization, following this we do an analysis.
Single circular knitting machine while adding tissue covering yarn, ground yarn and the veil is the same through the yarn guide while feeding the knitting region of the knitting needle hook, by the ground yarn, veil feed angle (horizontal angle, vertical angle ) is different, so that the ground yarn, there are differences in the hook position veil, that is to thread the needle bar away, close to the needle bar veil, above or below ground yarn veil, and through to yarn tension control to ensure the land veil yarn, stitch veil, off circle, back when the ring, remained relatively stable position, so that the veil has always been at the front of the fabric.
While on the sweater machine to yarn veil through two different yarn feed respectively hook, how to ensure that the ground yarn, veil position within the hook relatively stable, has become a key evaluation sweater machine coverage is good or bad . Sweater machine in the weaving process to go through three yarn feeder liners were fed yarn (commonly known as the circle of yarn), veil, to yarn, fabric before the formation of a complete course. When the needle through the woven veil triangle (commonly known as the mountain triangle), the veil is pad into the hook, but in the process, the mountain triangle only stitch was not off circle, and on a row of old coil remains in the needle bar , the new pad into the veil remain in the hook, does not bend into a coil. The machine continues to run after the knitting of ground yarns triangle (commonly known as Hill triangle), needles rise, but the increase in height is limited, which increase in height relative to the triangular mountain, the only reached its tuck height, to ensure that no new veil fed from the needle tongue withdrew, still stay in the hook, as shown in Fig. Then needles began to decline, the ground yarn is pad into the needle hook, this time, the ground yarn, as shown in the relative position of the veil in the hook in Figure 2. Ground yarn on the veil in the next, if not changed this position, the fabric is formed of precisely the veil in front of fabric, yarn in the fabric to the back.
However, if the machine is not adjusted in place, not the case. Because the machine after a hill triangle, new feeding ground yarn, the veil is bent to form a coil, but it is still within the needle from the needle hook did not take off, when it enters the next course of liner yarn triangle needles selectively increased (twill for a needle rises across the two pins), the coils on the rise at this time of the needle will not pin retainer ring brought up. A coil without the needles rising on the needles will be raised to pull, the inner needle has a hook ground yarn coil, veil position vary, forming open field. Move the machine, after the mountains, hills triangle jack twice to close the needle, the needle on the old coil was completely off circle, knitting needle, frequency and amplitude under reciprocating have increased, the old coil needle hook, needle bar sliding process, beyond the veil to form a roll of yarn, resulting in open probability increased.
2. Solution
To solve these problems, it should consider the following two aspects:
a. to the yarn, stitch length veil have differences (ground yarn short, long veil), and the difference is larger, purpose of doing so is to make a large part of the role of the tension on the ground yarn cloth, rather than in a veil on that affect the veil when unseating from cloth tension imaginary circle of yarn attached to the under ground, with the yarn off circle to circle and off circle, will not go beyond the veil off circle to the yarn occurs in the course of phenomenon. Loop length veil general than to the long length of yarn coils 1.2 ~ 1.6 mm (for polyester filament yarn to time).
b. When the knitting yarn liner, as some needles rise does not increase textured yarn pull on the needle, the veil occurs roll, to solve this problem, the general use of the spacer yarn path triangular depression this method, the aim of using sedimentation Woods jaw will not rise on the knitting needle provoked coil, tension, to overcome rising weave pull for coil, shown in Figure 3. But note that, when the machine liner yarn needle flat road triangular needle channel width is too wide (ie, channel width is much larger than the butt needle width, shown in Figure 4), this approach is not valid, and such machines are not available cover classes in knitting sweater fabric.
By the above adjustments, usually good results weave sweater fabric covering. But when the local yarn C yarn, polyester-cotton and polyester filament easily due to adhesions, during debugging only pay attention to the above two points, but also will advance to the hill sinker triangle syringes center direction. This is due to the pad into the veil was not only bent yarn into a circle, triangle when it enters the hill, due to the rise of knitting needles, the veil completely relaxed, when in contact with the ground yarn (polyester yarn), prone to adhesions caused by tumbling. Push the upper part of the hill tight triangle sinker sinker jaws of death is to be pushed tight veil to avoid sticking.
In short, when this type of fabric weave, weaving process should pay attention to analyze every detail, and make appropriate adjustments based on the characteristics of the machine technology curve, and finally achieve their goals. But for this article involved a triangular flat needle machine needle tract too broad, flat needle on the triangle will have to be transformed.
