Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1990-11-21
1992-12-08
Harvey, Jack B.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324689, G01R 2726
Patent
active
051701286
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a device for detecting a sufficient glue coating of a paper strip to be adhesively bonded in a cigarette machine.
To connect cigarette filters to the cigarette portion containing the tobacco, there is usually a filter cover paper which on the one hand wraps the filter and which on the other hand, by means of a projecting edge, connects the cigarette portion containing the tobacco to the filter. As a rule, the filter is joined together with the cigarette portion by gluing.
In cigarette machines in common use nowadays, as a rule the cigarettes are first produced as double cigarettes which are then cut open and drawn apart from one another. Double filters are then introduced into the interspace between the two cigarettes. The filters and the two lateral cigarette portions are then wrapped in the previously glue-coated filter cover paper, a lateral region of the filter cover paper in each case connecting the filter and cigarette to one another.
For particular reasons, filter cover papers used today are often equipped with zones of increased air permeability, in order to allow a ventilation of the filter region. It is therefore inadmissible to apply a glue layer onto the filter cover paper in this region.
It has been shown that it can happen, especially at high production speeds, that the glue coating applied to the filter cover paper has already dried before connection to the filter and the cigarette, to such an extent that there is no guarantee of a sufficient connection. It can happen, furthermore, that the glue-coating layer was applied too thinly and/or that its moisture content was too low. At all events, defective cigarettes are produced, and these can no longer be located during the further production process without additional action.
A process and a device for detecting the presence of a glue layer on a running web are known from EP 0,300,734 A2. Here, the increased light reflection of a glue layer in comparison with a reflection of the paper free of glue is evaluated and the presence of a glue coating thus established.
This process can detect only the presence, but not the thickness of a glue layer. Moreover, incorrect measurements as a result of a soiling of the optical components can occur.
German Offenlegungsschrift 3,143,526 makes known a process for monitoring a sufficient glue coating on a paper strip, in which the presence of a sufficient glue coating is detected by means of a capacitive sensor.
This device is not suitable for use on filter cover papers which have a glue coating in the form of a recurring pattern, since for this a highly accurate guidance of the paper strip in relation to the sensor is necessary and the sensor is incapable of distinguishing a recurring pattern from undesirable interruptions of the glue coating.
The object on which the invention is based is to provide a device for detecting a sufficient glue coating of a paper strip to be adhesively bonded, by means of which both the presence and the state of a glue coating applied especially in a recurring pattern can be detected shortly before the adhesive bonding of the paper strip in a cigarette machine.
This object is achieved by a device for detecting a sufficient glue coating on a first surface of a paper strip to be adhesively bonded in a cigarette machine, comprises a sliding plate having a plate surface engaging a second surface of the paper strip, opposite to the first surface, and over which the paper strip runs in a first direction. A plurality of capacitive sensors, for detecting presence of moisture in the glue coating, on the first surface of the paper strip, are directed toward the second surface of the paper strip, are mounted in recesses in the plate surface of the sliding plate and are arranged in a row extending transversely to the first direction. A control means is coupled to the sensors for evaluating signals emitted from the sensors and for emitting a fault signal for controlling the cigarette machine when the moisture sensed in the glue coating is insufficient.
By
REFERENCES:
patent: 3043993 (1962-07-01), Maltby
patent: 3713966 (1973-01-01), Lippke
patent: 4417934 (1983-11-01), Vaughan
Gaisser Horst
Masurat Heinz
Meyer Meinhard
Pautke Ingo
B. A. T. Cigarettenfabriken GmbH
Harvey Jack B.
LandOfFree
Device for detecting a sufficient glue coating of a paper strip does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for detecting a sufficient glue coating of a paper strip, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for detecting a sufficient glue coating of a paper strip will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-962919