Bi-component fiber for the production of spunbonded fabric

Abstract

A bi-component fiber (1), in particular for the production of spunbond fabrics (4), with a first component (2) and a second component (3), whereby the first component (2) has a first polymer as an integral part and the second component has a second polymer as an integral part. It is provided that the difference between the melt-flow indices of the first component (2) and the second component (3) is less than or equal to 25 g / 10 minutes and that the melt-flow indices of the first component (2) and the second component (3) in each case are less than or equal to 50 g / 10 minutes.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to a bi-component fiber, in particular for the production of spunbond fabric, with a first component and a second component, whereby as integral parts, the first component has a first polymer and the second component has a second polymer. In addition, the invention relates to a spunbond fabric with at least one bi-component fiber of the above-mentioned type.[0003]2. Description of Related Art[0004]Bi-component fibers of the type in question usually have a first component that consists of a first polymer and a second component that consists of a second polymer. In this case, different types of bi-component fibers can be distinguished, which in each case have different characteristic distributions of the components in the fiber cross-section. Bi-component fibers, in which the first component surrounds and thus encompasses the second component in the cross-section of the fiber, are referred to as core...

AI Technical Summary

Benefits of technology

The invention provides a way to improve the properties of bi-component fibers, especially in the case where the two components have similar and small MFIs. By selecting specific MFIs for the components, the synergistic effects between the properties of the two components can be realized. This results in improved mechanical properties in spunbond fabrics made from these fibers, including increased nail tear resistance and tearing force. In conventional fibers, these two measures typically result in a drop in one of the two measures when trying to improve the other. The use of bi-component fibers with the selected MFIs also allows for an increase in recycled materials without negatively affecting the properties of the components. The invention also allows for the formation of a core-sheath fiber, where the components with the higher MFI form the sheath and surround the component with the higher melting point.

Problems solved by technology

In practice, however, the use of these synergistic effects is limited to the extent that the properties of the components cannot routinely be combined in the described, only advantageous way.

Another problem that arises in the case of bi-component fibers is the limited recyclability of the bi-component fibers in their production.

In this case, however, it is technically impossible or uneconomical to separate the components of the bi-component fibers.

The associated change in the properties of the bi-component fiber is in general undesirable and can be tolerated only up to a certain degree.

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