Method for Manufacturing a Smoking Article Filter

Abstract

A method for producing filters for smoking articles includes: providing a filter rod, the filter rod having a cylinder shape with a first filter rod end, a second filter rod end and a circumferential filter rod surface; providing an outer wrapper; wrapping the outer wrapper around the filter rod along a filter rod circumferential direction covering at least parts of the circumferential filter rod surface; obtaining a wrapped filter rod; cutting the wrapped filter rod perpendicular to a filter rod longitudinal direction into outer and inner wrapped filter rod segments, wherein first and second outer wrapped filter rod segments include the first and second filter rod ends, respectively, and have a length being less than 10% of a total length of the filter rod and / or less than 10 mm; and obtaining the inner wrapped filter rod segments as the filters and disposing the outer wrapped filter rod segments.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT / EP2020 / 065351, filed Jun. 3, 2020, published in English, which claims priority to European Application No. 19178663.1 filed Jun. 6, 2019, the disclosures of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to a method for producing filters for smoking articles and filters for smoking articles obtained by such a method, according to the preamble of present claims 1 and 15.[0003]Conventional filter cigarettes are produced in large quantities by joining tobacco rods with filter rods and firmly connecting them with a tipping paper, followed by cutting operations. These procedures are well-known in the art. Meanwhile, filters, also called filter sticks, for smoking articles are sold separately to be used for different kinds of smoking articles.[0004]Said filters are typically made...

AI Technical Summary

Benefits of technology

The patent provides a method for making filters with improved visual appearance. It involves using an inner wrapped filter rod segment while discarding the outer wrapped filter rod segments. The filter rod is produced longer than needed for the final filters, so that the outer wrapped filter rod segments can be removed. When the wrapped filter rod is cut, the filter rod and outer wrapper are cut perpendicular to the filter rod's longitudinal direction, which separates the different segments and makes the inner wrapped filter rod segments / filters look better with their shared edge.

Problems solved by technology

By cutting the wrapped filter rod substantially adjacent to filter rod ends and disposing the thereby obtained outer wrapped filter rod segments, manufacturing tolerances affecting the edges / ends of the filter become irrelevant.

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