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Apparatus and method for forming filter rods

A filter and equipment technology, applied in applications, e-liquid filter elements, tobacco, etc., can solve the problems of high waste of extrusion tools, different tow strength, etc., and achieve uniform processing, uniform pulling strength, and quality increased effect

Active Publication Date: 2019-10-25
PHILIP MORRIS PROD SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Where the delivery rolls are not at exactly the same speed, the strength applied to the tow will not be the same, and thus the properties of the fibers entering the extrusion tool will not be the same, resulting in a lower quality of the resulting filter rod
This drop in quality can be particularly significant at the beginning of the extrusion process until the delivery rolls are synchronized with each other, potentially resulting in high waste every time the extrusion tool is started

Method used

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  • Apparatus and method for forming filter rods

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Embodiment Construction

[0027] figure 1 The shown device comprises a first source 1 and a second source 2 . Both sources include filter material.

[0028] Cellulose acetate can be used as filter material. The filaments may subsequently be treated with a plasticizer to promote interfiber bonding of the various filaments, including tows, for the purpose of providing the filler with uniform density and overall cohesive characteristics. The tow may comprise a plurality of cellulose acetate filaments extending longitudinally and coextensively along the mass of the tow. The cellulose acetate may have a total denier of 25,000 to 75,000, more preferably in the range of 30,000 to 50,000, the foregoing being based on a fiber denier of about 1 to 16 and preferably 3 to 6 denier. Other materials are suitable for use as fillers and may include polyolefins, polyethylene and paper tow.

[0029] As a preliminary process for forming filter rods, the filter material described in representative form as a cellulose ...

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Abstract

The invention relates to an apparatus for forming filter rods for aerosol-generating articles. The apparatus comprises a first and a second source, the first source being provided to supply filter material in the form of a first tow, and the second source being provided to supply filter material in the form of a second tow. The apparatus further comprises a single driven delivery roller for advancing the first tow and the second tow and an extrusion tool for processing the first tow and the second tow. The delivery roller is arranged such that the first and second tows are advanced from the first and second source towards the extrusion tool by the delivery roller only. The extrusion tool is configured to process several sources of filter material simultaneously to create one filter rod. The invention also relates to a method for forming filter rods for aerosol-generating articles.

Description

technical field [0001] The present invention relates to apparatus for forming filter strips for aerosol generating articles. Background technique [0002] Filter rods may be formed from fibrous filter material by extrusion techniques. In some cases, it is necessary to cure the components of the fibrous filter material during the extrusion process, for example by heat. The fibers progress continuously until they solidify, which prevents them from gaining sufficient volume for a filter rod. To balance this lack of volume, more than one source of fibrous filter material can be processed simultaneously in the same extrusion tool to produce a filter rod. [0003] In order to process more than one tow, the solution is to place as many delivery rollers as tows in parallel before the extrusion tool in order to advance the fibers individually. However, with different speeds between the delivery rollers, the loading of material into the extrusion tool may be unstable. [0004] Spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A24D3/02
CPCA24D3/0204A24D3/0237A24D3/17A24D3/0287
Inventor G·卡普里尼
Owner PHILIP MORRIS PROD SA
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