Method and device for testing cigarette packages wrapped with film
First Claim
1. A method for testing moving products (11) having at least two layers, wherein at least one layer (14) of the product (11), which is arranged further inwards, namely an inner layer, is covered at least regionally by at least one, at least partially transparent product layer (16), which is arranged further outwards, namely an outer layer, comprising the steps of:
- a) illuminating the outer layer (16) of the product (11) by unpolarized light, with light that is reflected at the outer layer (16) comprising at least 70% of linearly s-polarized light;
b) the s-polarized component of the light reflected by the outer layer (16) and/or of light reflected by the inner layer (14) and/or a p-polarized component of the light reflected by the outer layer (16) and/or of the light reflected by the inner layer (14) is/are recorded in each case separately using at least one suitable electrooptic recording element (28, 35) in the form of an image or partial image of the product (11),c) the recorded s-polarized and/or the recorded p-polarized light component is/are evaluated in order to be able to draw conclusions relating to features of the outer layer (16) and/or of the inner layer (14),wherein the outer layer (16) is part of a film wrap (12) of a cigarette package (13) and the inner layer (14) is part of the cigarette package (13), wherein the angle of incidence, under which the outer layer (16) is illuminated, is greater than 85% of the Brewster angle of the outer layer (16) and smaller than 115% of the Brewster angle of the outer layer (16), and approximately corresponds to the Brewster angle of the outer layer (16).
1 Assignment
0 Petitions
Accused Products
Abstract
A method for testing moving products having at least two layers, such as cigarette packages wrapped with film, wherein at least one layer of the product, namely an inner layer which is arranged further inwards, is covered at least regionally by at least one, at least partially transparent product layer, namely an outer layer which is arranged further outwards, wherein the outer layer of the product is illuminated under an angle of incidence of about 35°, with light, in which the light that is reflected at this layer comprises at least 70%, at least 90%, or at least 95%, of linearly s-polarized light, the s-polarized component of the light reflected by the outer layer and/or of the light reflected by the inner layer and/or the p-polarized component of the light reflected by the outer layer and/or of the light reflected by the inner layer are recorded in each case using at least one suitable electrooptic recording element in the form of an image or partial image of the product and wherein the recorded s-polarized and/or the recorded p-polarized light component are evaluated in order to be able to draw conclusions relating to features of the outer layer and/or of the inner layer.
5 Citations
21 Claims
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1. A method for testing moving products (11) having at least two layers, wherein at least one layer (14) of the product (11), which is arranged further inwards, namely an inner layer, is covered at least regionally by at least one, at least partially transparent product layer (16), which is arranged further outwards, namely an outer layer, comprising the steps of:
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a) illuminating the outer layer (16) of the product (11) by unpolarized light, with light that is reflected at the outer layer (16) comprising at least 70% of linearly s-polarized light; b) the s-polarized component of the light reflected by the outer layer (16) and/or of light reflected by the inner layer (14) and/or a p-polarized component of the light reflected by the outer layer (16) and/or of the light reflected by the inner layer (14) is/are recorded in each case separately using at least one suitable electrooptic recording element (28, 35) in the form of an image or partial image of the product (11), c) the recorded s-polarized and/or the recorded p-polarized light component is/are evaluated in order to be able to draw conclusions relating to features of the outer layer (16) and/or of the inner layer (14), wherein the outer layer (16) is part of a film wrap (12) of a cigarette package (13) and the inner layer (14) is part of the cigarette package (13), wherein the angle of incidence, under which the outer layer (16) is illuminated, is greater than 85% of the Brewster angle of the outer layer (16) and smaller than 115% of the Brewster angle of the outer layer (16), and approximately corresponds to the Brewster angle of the outer layer (16). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for testing moving products (11) having an inner layer (14) covered at least regionally by at least one, at least partially transparent product outer layer (16), wherein the device has:
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at least one illumination element (20); a polarization filter (27, 31) for filtering p-polarized light and/or a polarization filter (29, 32) for filtering s-polarized light; and at least one electrooptic recording element (28, 35), wherein; a) the at least one illumination element (20) is directed at least at one side of the product (11) such that unpolarized light emitted by the illumination element (20) illuminates the outer layer (16) of the product (11), with light comprising at least 70%, of linearly s-polarized light, b) the polarization filter (27, 31) for filtering the p-polarized light and/or the polarization filter (29, 32) for filtering the s-polarized light is/are arranged in a beam path of the light reflected at the outer layer (16) and/or the inner layer (14), c) the at least one electrooptic recording element (28, 35) is positioned such that it records the s-polarized light and/or the p-polarized light after passage through the polarization filter(s) (27, 29, 31, 32) in each case separately as an image or partial image of the product, and d) the outer layer (16) is part of a film wrap (12) of a cigarette package (13) and the inner layer (14) is part of the cigarette package (13), wherein the angle of incidence, under which the outer layer (16) is illuminated, is greater than 85% of the Brewster angle of the outer layer (16) and smaller than 115% of the Brewster angle of the outer layer (16), and approximately corresponds to the Brewster angle of the outer layer (16). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification