Spundbonding spin pack characterized by uniform polymer distribution and method of use

a polymer distribution and polymer technology, applied in the field of meltspinning apparatus and methods, can solve the problems of inadequate control, lack of robustness, inability to accept irregularities in nonwoven webs, etc., and achieve uniform physical and chemical properties, easy scaling, and greater uniformity

Inactive Publication Date: 2005-04-28
AKTIENGES ADOLPH SAURER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0010] In accordance with the principles of the invention, the thermoplastic polymer(s) is/are distributed in the machine direction of the spin pack by a plurality of coathanger distribution chambers so that the flow rate and fluid pressure is substantially uniform in the machine direction before streams of the polymer(s) flow downstream for combining (if necessary) and extruding. As a result, the pressure of any single stream of thermoplastic polymer among the multiple streams flowing through the spin pack downstream of the coathanger distribution chambers is substantially equilibra

Problems solved by technology

Multi-component fibers enable a manufacturer to take advantage of the material-specific properties of different thermoplastic polymers simultaneously, often with synergistic results.
Because of the variations in the fluid pressure of the thermoplastic polymer, unacceptable irregularities are observed in the nonwoven web.
The configuration plates are typically thinner than about 0.060″ and, hence, lack robustness.
Although relatively inexpensive, the inherent inability to adequately control the etching process produces inaccuracies that cause the geometri

Method used

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  • Spundbonding spin pack characterized by uniform polymer distribution and method of use
  • Spundbonding spin pack characterized by uniform polymer distribution and method of use
  • Spundbonding spin pack characterized by uniform polymer distribution and method of use

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Embodiment Construction

[0037] The invention is directed generally to a spin pack for a meltspinning apparatus having improved polymer distribution in the machine direction. Although the filaments will be described herein as being formed using an exemplary meltspinning apparatus, it should be understood that modifications to the exemplary meltspinning apparatus described herein could be made without departing from the intended spirit and scope of the invention.

[0038] With reference to FIG. 1, a spunbonding apparatus 10 is equipped with an extruder 12 that converts a solid melt-processable thermoplastic polymer (Polymer A) into a molten state and transfers the molten polymer under pressure to metering pump(s) 16. A second solid melt-processable thermoplastic polymer (Polymer B) is converted by another extruder 14 into a molten state and transferred under pressure to metering pump(s) 18. Pellets of the solid thermoplastic polymers are placed in hoppers 11, 13 and fed to the corresponding one of extruders 12...

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Abstract

A meltspinning apparatus that provides for uniform distribution of a flow of a melt-processable thermoplastic polymer in a machine direction of the meltspinning apparatus. The meltspinning apparatus includes a spin pack having a plurality of side-by-side coathanger-shaped distribution chambers. Each of the distribution chambers uniformly distributes the polymer flow in the machine direction so that the molten polymer has a substantially uniform residence time in the chamber during distribution.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60 / 513,676 filed on Oct. 23, 2003, the disclosure of which is hereby incorporated in its entirety by reference herein.FIELD OF THE INVENTION [0002] The invention relates generally to melt-spinning apparatus and methods, and more particularly, to a spin pack for a melt-spinning apparatus and methods of forming nonwoven webs with a melt-spinning apparatus. BACKGROUND OF THE INVENTION [0003] The spunbonding process is a melt-spinning technology used for forming nonwoven webs of filaments or fibers composed of one or more thermoplastic polymers such as polyethylene, polypropylene, and polyester. Spunbond nonwoven webs are fashioned into many consumer and industrial products, including disposable hygienic articles, disposable protective apparel, fluid filtration media, and household durables. Spunbonding processes generally involve pumping one or more molten thermoplasti...

Claims

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Application Information

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IPC IPC(8): D01D4/06D04H3/02
CPCD01D4/06B29C48/05B29C48/3001B29C48/345B29C48/705
Inventor ALLEN, MARTIN A.BENTLEY, RACHELLE
Owner AKTIENGES ADOLPH SAURER
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