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Apparatus for Dispensing & Conditioning Layers of Filter Paper Disclosure Number: IPCOM000127542D
Publication Date: 2005-Aug-31
Document File: 3 page(s) / 187K

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The Prior Art Database

Related People

James Cunnington: ATTORNEY [+1]


Device for conditioning and dispensing layers of filter paper/pads for smoking articles. The device allows layers of paper to be conditioned prior to use in machine smoking tests according to standard conditions, in particular for testing the ignition propensity of a cigartte. The apparatus is cylindrical and stores layers of filter paper in groups of ten, each group separated by an air permeable mesh.

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Apparatus for Dispensing & Conditioning Layers of Filter Paper

Described herein is an apparatus for dispensing and/or conditioning layers of  filter paper, and in particular the filter paper layers for machine smoking of cigarettes, including machine smoking of cigarettes to test the ignition strength of cigarettes.


A filter paper holder is required to allow filter paper, such as Whatman’s No.2 filter paper, to be fully conditioned according to the ASTM2187-02b protocol (Standard Test Method for Measuring the Ignition Strength of Cigarettes) to test the ignition propensity of a cigarette. For this purpose, different (5, 10 or 15) layers of the filter paper need to be separated so that they can be conditioned before use. The standard method involves smoking at least 40 cigarettes, one at a time on top of a conditioned 10-layer group of filter pads. Another requirement dictates that the filter pads be flat and free from contamination before use. This is essential to maintain a good contact with a cigarette.

The present apparatus was designed to allow adequate air flow to circulate about stacks of filter paper arranged in layers of 10 papers, as well as holding the papers flat.  The need to hold the Whatman No.2 filter paper, which measure 150 mm in diameter, flat and also to minimise the space taken up by the apparatus in a laboratory means that the most appropriate shape for the design is that of a cylinder. 

Description of the Dispenser Unit

The conditioning and dispensing unit comprises a body portion and a base portion. The body portion is preferably cylindrical in shape and of a width at least equal to the diameter of a filter pad. A number of holes are present in the body portion to allow air to circulate within the unit and effectively condition the filter pads contained therein. As many holes as possible should be put around the cylinder wall to aid the conditioning process within a controlled laboratory environment specified by the ASTM2187-02b Standard. The size of holes may be in the range of 2 mm to 20 mm.  The preferred number of holes surrounding each 10-layer of filter pads are between 20 to 50, allowing the spacing of the holes to between 2 mm to 20 mm.  

The conditioning and dispensing unit can be made from a range of materials, such as engineering plastics, wood, Perspex, stainless steel, or any other porous material. The filter pads are then placed in the unit 10 sheets at a time.  Each group of filter papers are separated by a plastic wire mesh with a thickness of about 5 mm. Other materials can be used to make the mesh so long that they...