Tews Elektronik Dipl. -Ing. Manfred Tews

Tews Elektronik

Tews Elektronik Gmbh&co. Kg

Other

Manfred Tews

Fette Gmbh

Fette Compacting Gmbh

Aiger Group Ag

Rainer Herrmann

Udo Schlemm

Stefan Zaage

Harald Ceslik

Hendrik Richter

Ingo Schmidt

Ulrich Arndt

Wolfgang Sexauer

Jan Sikora

Jôrn Eggers

Jörn Eggers

Dimitar Yankov Yanchev

A method and device for measuring the position of sections with an absorbing substance in multi-segment filter rods of the tobacco processing industry by measuring a varying shift of the resonance frequency A and/or spread of the resonance line B during movement of the rod in the longitudinal direction, using a microwave resonator, which has a field concentration in a spatial area, wherein this spatial area is smaller in the rod direction than the segment length to be determined, forming a difference quotient &#x394;A of the resonant frequency shift A and/or &#x394;B of the resonance line spread B relative to the longitudinal direction, determining local extreme values of the respective difference quotients, and assigning local extreme values as a position of a transition from a section with higher content of absorbing substance to a section without, or with lower content, of absorbing substance, and vice versa.

Method and device for measuring the position of segments with absorbing substances in multi-segment filter rods of the tobacco processing industry

Method for measuring a moisture value F of dielectric materials using at least one microwave resonator, one shift A of the resonant frequency being respectively evaluated for at least two resonance modes with resonant frequencies which are different from one another and a density-independent moisture value being calculated from the measured shifts in the resonant frequency.

Method and device for measuring a moisture value of dielectric materials

A device for producing cigarettes in the tobacco processing industry that has a tobacco processing unit and a paper feeding unit, which feeds a paper having LIP strips to the tobacco processing unit, wherein the paper feeding unit has a measurement device, which continuously detects the LIP strips, wherein the measurement device has a microwave resonator, through whose measurement region the paper having the LIP strip is passing, and which detects a shift of the resonance curve and/or a broadening of the resonance frequency.

Device for producing cigarettes in the tobacco processing industry and a method therefore

A method for quality surveillance of powdered press material for a rotary press, in which the press material is fed from a reservoir via a preferably vertical feed channel to a filling device, which continuously fills dies of a rotor with press material wherein to the feed channel and/or the filling device is assigned a microwave resonator with an analysis unit, which measures the moisture and/or the density and/or the size of the granules of the press material, and at least one press variable of the microwave resonator is used for changing a control variable of the rotary press.

Rotary press for quality surveillance of powdered pressed material

Method and apparatus for the measurement of mass or density and/or for the measurement of the humidity in a plurality of portioned units in a non-metallic carrier material, which provides the following: a microwave measuring instrument, consisting of at least one microwave resonator for generating at least one resonance mode in a spatially limited measurement area and an analyzing unit for analyzing at least one variable of the at least one resonance mode, a conveying device for the carrier material, which transports the carrier material with the portioned units through the measurement area, the microwave measuring instrument measures at least one variable of the at least one resonance mode at a time when only the carrier material without portioned unit is in the measurement area, and at a time when the portioned unit is at least partially in the measurement area, the analyzing unit subtracts the variable measured for the carrier material from the measurement values for the portioned unit, and determines a value of the humidity and/or of the mass or density of the portioned unit from at least one difference by way of an input-output map.

Apparatus and method for the measurement of mass and density and/or for the measurement of the humidity of portioned units

An apparatus for the measurement of mass and/or moisture of dielectric objects, with an analysing unit, at least one high frequency generator, at least one high frequency detector and with a high frequency resonator, wherein the at least one high frequency generator can generate at least two modes which are independent from each other, having different resonance frequencies in the resonator, the at least one high frequency detector can measure the occurring frequencies for each mode in the resonator, and the analysing unit can determine a shift of the resonance frequency (A) and a change of the resonance curve for the measured frequencies in each mode, and can calculate the mass and/or moisture of the dielectric object from the determined values for the shift of the resonance frequency (A) and the change of the resonance curve.

Apparatus and method for the measurement of mass and/or moisture of dielectric objects

A filter rod measuring station is equipped with measuring devices which measure at least the mass (M) of a filter rod and the draw resistance (PD) of the filter rod, and a microwave measuring device is provided for measuring the mass of the softener and/or the moisture content and/or the dry mass of the filter rod.

Filter rod measuring station as well as method for measuring the mass of a softener, the moisture and/or the dry filter material in a filter rod

Apparatus and method for detection and segregation of faulty cigarettes in a production/packaging installation for cigarettes having an apparatus by means of which faulty cigarettes are segregated from the conveyed sequence of cigarettes, wherein the apparatus and method use a generator and evaluation circuits for radio-frequency electromagnetic fields and use a sensor past whose end surface the ends of the cigarettes are passed and which applies the radio-frequency electromagnetic fields to the end surface of the sensor, whose size corresponds approximately to the size of the end surface of the cigarettes, with the changes in the electromagnetic fields as a cigarette passes being evaluated.

Apparatus and method for detection and segregation of faulty cigarettes

A Method and an apparatus for measuring the mass and/or moisture of the contents of incompletely filled capsules, containing, in particular, medicinal products, pharmaceutical products, vitamins and similar products, with the aid of microwaves is disclosed. The displacement of the resonant frequency and broadening of the resonance curve caused by the capsules in at least one resonator is determined and evaluated. Measurements are made integrated over the whole capsule as well as with high local resolution for various portions and cross sections of the capsule.

Method and device for measuring mass and/or moisture of the content of capsules

A method and the apparatus for determining the mass of portioned units of active substances, in particular capsules, tablets or dragees, involves leading the units of active substances through a microwave resonator and determining the mass from the displacement of the resonant frequency and the broadening of the resonance curve.

Method and apparatus for determining the mass of portioned units of active substances

Apparatus and method for determining the triacetin content in cigarette filter plugs during the manufacture of the filter plugs from a filter tow. The apparatus including a filter tow storage container, a filter tow stretching device, a device for feeding triacetin, to the filter tow, a plug-forming device, a device for dividing the plug into portions, a first microwave sensor disposed downstream of the plug-forming device, and a second microwave sensor disposed upstream of the feed device for the triacetin. The triacetin content is determined by transmitting a high frequency electromagnetic field through the filter plug both before and after the triacetin is added and measuring the frequency shift and spread of the electromagnetic field to determine mass signals Aand A, respectivley. Ais compared to Ato calculate the triacetin content of the filter plug.

Method and apparatus for determining the triacetin content in filter plugs

The method of detecting foreign bodies in continuous mass streams of fibrous material, strand-like material or material similar to bulk goods with the aid of microwaves, in which the mass flow is led through the field of a microwave resonator and in which the change (A) in the resonant frequency, effected by the material, and the change (B) in the width of the resonance curve of the microwave resonator is determined, is distinguished in that the ratio (B/A) of the changes is evaluated and compared with corresponding averages, and the presence of a foreign body is reported when the ratio differs from the averages by more than a predefined value.

Method of detecting foreign bodies in mass streams

A device for testing the quality of rope-like materials in the form of yarns, rollings, fiber bands and the like employs a microwave resonator and devices for determining the displacement of the resonant frequency and the widening of the resonance curve due to the rope-like material present in the microwave resonator. Mechanical devices are provided for transporting the rope-like materials through the measuring volume of the microwave resonator. The microwave field is homogeneous in the measuring volume and the measuring device is a microwave generator constructed for measuring the mass per length and the moisture of the rope-like materials. Sensitivity of the device is improved by using metallic elements to concentrate the electromagnetic field in the measuring volume.

Device for testing the quality of rope-like materials

The device for measuring the mass and/or the moisture of a material running through a spinning preparation machine is distinguished in that it has a microwave resonator () and associated adapted measurement electronics. The method for measuring the mass and/or the moisture of a material running through a spinning preparation machine is distinguished in that the measurement is carried out with the aid of microwaves.

Device and method for detecting the mass and the moisture content for spinning preparation machines

The microwave leakage field sensor for measuring moisture and/or density of dielectric materials is distinguished by the fact that it is of essentially rotationally symmetrical design and transmissive for electromagnetic radiation in the axial direction toward at least one side, and that an essentially rotationally symmetrical alternating field of standing waves can be generated in it, the spatial period of which field in the peripheral direction is less than the vacuum wavelength at the frequency of the alternating field.

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Hamburg, Germany

Rainer Herrmann