Apparatus for quality assessment of a sealing section of a package for food products, and a method thereof
An apparatus for quality assessment of a sealing section of a package for food products. The package includes at least a robustness layer and a plastic layer. The sealing section is formed by holding a first section and a second section of the package against each other while providing heat such that the plastic layer of the first and second section melt and the first and second section adhere to each other. The apparatus includes a sample holder arranged for fixating a sample including the sealing section of the package. At least part of the sample holder is transparent, a magnification device arranged on a first side of the sample holder, and an illumination device arranged on a second side of the sample holder. Light is provided to the magnification device through the sample holder The first and second side are opposite sides of the sample holder.
1. A method for quality assessment of a sealing section of a package for food products, wherein the package comprises at least a robustness layer and a plastic layer, wherein the sealing section is formed by holding a first section and a second section of the package against each other while providing heat such that the plastic layer of the first and second section melt and thereby provide for that the first and second section adhere to each other, the method comprising:
preparing a sample comprising the sealing section of the package,
placing the sample in a sample holder, wherein at least part of the sample holder is transparent, by orientating the sample according to a pre-set orientation and fixating the sample,
illuminating the sample by using an illumination device arranged on a second side of the sample holder,
magnifying the sealing section of the sample by using a magnification device arranged on a first side of the sample holder, wherein the first and second side are opposite sides of the sample holder, and
a step of capturing image data depicting the sealing section comprising:
controlling the light by using a light controlling device,
capturing image data with the light controlling device set in a diffusor light position, and
capturing image data with the light controlling device set in a high contrast position.
2. The method according to claim 1 , wherein:
the step of capturing includes using a camera fixated to a camera holder and a computer connected to the camera, wherein the camera is placed on the second side of the sample holder, and wherein the first and second sides are opposite sides of the sample holder.
3. The method according to claim 2 , further comprising:
polarizing light emitted from the illumination device before reaching the sample by using a first polarizing filter arranged between the sample and the illumination device, and
polarizing light passed through the sample holder before reaching the camera by using a second polarizing filter arranged between the sample and the camera.
4. The method according to claim 3 , wherein before the step of preparing the sample, the method includes: providing the package, which includes at least the robustness layer, the plastic layer, and the sealing section.
5. The method according to claim 4 , wherein before the step of providing the package, the method includes: forming the sealing section by holding a first section and a second section of the package against each other while providing heat such that the plastic layer of the first and second section melt and thereby provide for the first and second sections to adhere to each other.
6. The method according to claim 3 , wherein the first polarizing filter is a −45 degrees polarizing filter, and the second polarizing filter is a +45 degrees polarizing filter.
7. The method according to claim 2 , further comprising:
moving the sample holder in relation to the camera holder by using a stepping motor,
wherein the step of capturing image data depicting the sealing section comprises:
capturing a series of images, wherein each image is associated with a position of the stepping motor, and
stitching the series of images into one and the same image.
8. The method according to claim 1 , wherein the illumination device is provided with a light emitting area having a first length extending in a first length direction and a first width extending in a first width direction, wherein the first length is greater than the first width, wherein the sealing section has a second length extending in a second length direction and a second width extending in a second width direction, wherein the second length is greater than the second width, and wherein the first length direction is parallel with the second length direction.
9. The method according to claim 1 , wherein the robustness layer is a carton layer.
10. A method for quality assessment of a sealing section of a package for food products, wherein the package comprises at least a robustness layer and a plastic layer, wherein the sealing section is formed by holding a first section and a second section of the package against each other while providing heat such that the plastic layer of the first and second section melt and thereby provide for that the first and second section adhere to each other, the method comprising:
preparing a sample comprising the sealing section of the package,
placing the sample in a sample holder, wherein at least part of the sample holder is transparent, by orientating the sample according to a pre-set orientation and fixating the sample,
illuminating the sample by using an illumination device arranged on a second side of the sample holder,
magnifying the sealing section of the sample by using a magnification device arranged on a first side of the sample holder, wherein the first and second side are opposite sides of the sample holder,
capturing image data depicting the sealing section using a camera fixated to a camera holder and a computer connected to the camera, wherein the camera is placed on the second side of the sample holder, and wherein the first and second sides are opposite sides of the sample holder,
polarizing light emitted from the illumination device before reaching the sample by using a first polarizing filter arranged between the sample and the illumination device, and
polarizing light passed through the sample holder before reaching the camera by using a second polarizing filter arranged between the sample and the camera.
11. A method for quality assessment of a sealing section of a package for food products, wherein the package comprises at least a robustness layer and a plastic layer, wherein the sealing section is formed by holding a first section and a second section of the package against each other while providing heat such that the plastic layer of the first and second section melt and thereby provide for that the first and second section adhere to each other, the method comprising:
preparing a sample comprising the sealing section of the package,
placing the sample in a sample holder, wherein at least part of the sample holder is transparent, by orientating the sample according to a pre-set orientation and fixating the sample,
illuminating the sample by using an illumination device arranged on a second side of the sample holder,
magnifying the sealing section of the sample by using a magnification device arranged on a first side of the sample holder, wherein the first and second side are opposite sides of the sample holder,
capturing image data depicting the sealing section using a camera fixated to a camera holder and a computer connected to the camera, wherein the camera is placed on the second side of the sample holder, and wherein the first and second sides are opposite sides of the sample holder,
moving the sample holder in relation to the camera holder by using a stepping motor,
wherein the step of capturing image data depicting the sealing section comprises:
capturing a series of images, wherein each image is associated with a position of the stepping motor, and
stitching the series of images into one and the same image.