DD283171A5 - METHOD FOR INCREASING THE CROSS-STRENGTH AND FOR MODELING FLEECE WEBSITES PRODUCED FROM FIBER TONES OR FLEECE sewn fabrics - Google Patents

Abstract

The invention relates to a method for increasing the transverse strength and for the patterning of non-woven knitted or non-woven fabric knitted fabrics. The aim and object of the invention is the quality improvement and the broadening of the patterning possibilities. According to the invention, the stuffing device which feeds the fibers of the nonwoven fabric into the hooks of the needles is displaced stepwise across the needle axis in a stepwise manner over more than two needle pitches. Fig. 2 {fiber webs; Non-woven knitted fabric; Nonwoven stitchbonded fabric; Stuffer; offset; Transverse strength; patterning}

Description

For this 1 page drawings

Field of application of the invention

The invention is used in the production of nonwoven knitted fabrics. It serves on the one hand to improve the performance characteristics and on the other hand to increase the range of products.

Characteristics of the known state der.Technlk

There are already procedures? For the production of nonwoven sewing knits known in which non-spun fibers are processed into fabrics. In this case, the fibers are supplied in the form of a nonwoven fabric and submitted with the help of conveying or stuffing the sliding needles of a stitchbonding machine, detected by these and fed into prefabricated baseways, resulting in stitches on the left side of the goods. For these products, the strength of the finished goods is determined by the base webs (e.g., DD-PS160596, DD-PS258C29).

In the case of methods without base webs, in many cases the strength in the transverse direction is not sufficient and special measures are required to ensure that they are guaranteed. For better fiber integration one works with stuffing devices.

The known stuffing devices carry out a stroke-lowering movement, but can also be displaced laterally by one pitch, wherein a fixed offset repeat of 2 rows of stitches must be maintained.

From the available literature, methods are known in which the needles are misaligned with respect to the cardle roll carrying fibers, e.g. in fiber hand large circular knitting process.

Also known is a lateral offset of bursting and carding rolls of a delivery device for isolated fibers (DD-PS221484). It should be increased by the offset, the skew of the fibers to the einbindenden needles and the detection can be ensured.

Object of the invention

The object of the invention is to improve the quality of such nonwoven fabrics made of non-spun fibers. On the one hand, a firmer and denser integration of the fibers of wales into wales is to be achieved and, on the other hand, the ability to pattern the said fabrics to a certain extent.

Presentation of the essence of the invention

The invention is based on the object of improving the transverse strength of nonwoven knitted or nonwoven stitched fabrics without increasing the nonwoven fabric and at the same time creating pattern possibilities using the fiber material s to be processed for such fabrics.

The object is achieved by the dio fibers of the nonwoven in the hook 1er needles promotional stuffing device is offset transversely to the needle longitudinal axis gradually over a total of two or more than two needle pitches controlled.

According to the invention, the displacement path can be selected according to a desired pattern. The offset can be controlled via cams. When using timing chains, the offset paths and offset directions can be selected independently.

As a stuffing device, flat brushes or the like are preferably used.

The essence of the invention is therefore to provide that certain non-woven fabric for processing by controlled Veraatz the stuffing device to produce by stitching a fabric and so to create a strong connection between multiple wales.

The stroke-lowering movement of the stuffing device is maintained in a known manner, but in addition there is an offset movement through cams or chain link control o.a. according to pattern to the left or right. The fibers present in the non-woven fabric make this movement and are thus incorporated into several adjacent wales. Due to the multiple and offset integration, the strength of such fabrics in the transverse direction is increased and the elongation is reduced.

If a longitudinally striped nonwoven fabric or rovings, lunts or the like additionally provided with the nonwoven fabric are fed together and likewise staggered, then wavy lines or other arbitrary patterns result from the controlled offset of the stuffer device.

Appropriately, the needle-to-needle offset occurs; H. In jumps corresponding to the needle pitch. E3 is also possible to set deviations from the pitch. As a result, the strength in the transverse direction and the elongation can be influenced.

The size of the total offset depends on the selected offset control. When using cam plates with a 16-line repeat, the offset can be made to the left or right via 8 slide needles. When using timing chains, the offset paths and directions are more independently selectable

AusfuhrungsbeJspiel

In two embodiments, the invention will be explained in more detail. The drawings show in

Fig. 1: the exemplary offset path of a stuffing device in a 16-series rtapport Fig. 2: an example offset path in offset control with pattern chains.

Fig. 1 shows the offset path when using cams with a 16-row repeat (MR 1-16) recognize. The offset is made over 8 rows of wales for wicks MS 8-1 to the right and in the same way over 8 rows of wales for stitchbands 8-1 to the left, so that after 16 rows of stitches the repeat begins anew.

In Fig. 2 it can be seen that with the same offset width of 8 wales MS 1-8 a rapport over 23 rows of stitches MR 1-23 is formed, wherein occur within the rapport several changes of direction of the repeat. Such offset controls can only be realized with pattern chains.

Claims (3)

A method for increasing the transverse strength and for the patterning of nonwoven webs produced from nonwoven fabrics, characterized in that the stuffing device conveying the fibers into the hooks of the needles is controlled transversely to the longitudinal axis of the needle over two or more than two needle pitches is offset. 2. The method according to claim 1, characterized in that the offset path is selected according to the desired pattern. 3. The method according to claim 1, characterized in that the offset is controlled by cams, chains or chain links or other means.