Sealing system for sealing a tube and an automated method of operating the same

Patent metadata

Field	Value
Publication number	US-11820084-B2
Application number	US-201917413702-A
Country	US
Kind code	B2
Filing date	Dec 18, 2019
Priority date	Dec 21, 2018
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

Disclosed is an automated method (54) which includes directing rays from a source (34) to a tube (38) disposed between relatively movable first and second sealing plates (20, 32), capturing an image (70) of at least a portion of the tube (38) by an image capturing device (26), and transferring the captured image (70) to a processing device (24). The method (54) also includes determining a plurality of tube parameters by the processing device (24) based on the captured image (70), using an image processing technique and determining a plurality of sealing parameters from a database (44) by the processing device (24) based on the determined plurality of tube parameters. Additionally, the method (54) includes controlling the drive unit (22) and a heater (36) by the processing device (24) influenced by the determined plurality of sealing parameters, to respectively compress the tube (36) and perform heat sealing of the tube (38).

First claim

The invention claimed is:

1. An automated method for sealing a tube by a sealing system, the automated method comprising:
directing illuminating rays from a source to the tube disposed between relatively movable first and second sealing plates, wherein at least one of the first and second sealing plates is coupled to a drive unit for causing said relative movement;
capturing an image of at least a so illuminated portion of the tube at an image capturing device and transferring the captured image of the at least portion of the tube from the image capturing device to a processing device;
operating the processing device to determine a plurality of tube parameters the based on the captured image, using an image processing technique;
operating the processing device to determine a plurality of sealing parameters selected from a database and based on the determined plurality of tube parameters; and
operating the processing device to control the drive unit and a heater, influenced at least in part by the determined plurality of sealing parameters, to respectively compress the tube and perform heat sealing of the tube, wherein the compressing of the tube and the performing of the heat sealing of the tube occurs after the determining of the plurality of sealing parameters.

2. The automated method as claimed in claim 1 , wherein the plurality of tube parameters comprises one or more of: an outer diameter of the tube, an inner diameter of the tube, and a material of the tube.

3. The automated method as claimed in claim 2 , wherein determining the plurality of the tube parameters by the image processing technique comprises:
preprocessing the captured image of the at least portion of the tube to separate a tube region from a remaining region; and performing a segmentation of the tube region to separate regions of interest from a background region.

4. The automated method as claimed in claim 3 , wherein performing the segmentation of the tube region comprises:
applying a feature detection algorithm to determine a first boundary representative of an outer surface of the tube based on a first predefined threshold value; and
generating a first binary image based on the determined first boundary representative of the outer surface of the tube.

5. The automated method as claimed in claim 4 , wherein determining the plurality of the tube parameters comprises determining the outer diameter of the tube based on pixel data of the generated first binary image.

6. The automated method as claimed in claim 4 , wherein performing the segmentation of the tube region comprises:
applying the feature detection algorithm to determine a second boundary representative of an inner surface of the tube based on a second predefined threshold value; and
generate a second binary image based on the determined second boundary representative of the inner surface of the tube.

7. The automated method as claimed in claim 6 , wherein determining the plurality of the tube parameters comprises determining the inner diameter of the tube based on pixel data of the generated second binary image.

8. The automated method as claimed in claim 7 , wherein determining the plurality of the tube parameters comprises determining the material of the tube from the database based on a capacitance determined based on an area of one of the first sealing plate and the second sealing plate, a distance between the first sealing plate at a start location and the second sealing plate, and an absolute permittivity of a dielectric material between the first and second sealing plates.

9. The automated method as claimed in claim 1 , wherein the image processing technique comprises using a mathematical function of an artificial neural network.

10. The automated method as claimed in claim 1 , wherein the plurality of sealing parameters comprises a torque of the drive unit, a heating temperature of the heater, a movement distance of the first sealing plate from a start location to a tube sealing location proximate to the second sealing plate, and at least one of a time period and a speed for moving the first sealing plate from the start location to the tube sealing location proximate to the second sealing plate.

11. The automated method as claimed in claim 1 , comprising capturing an image of a seal of the tube by the image capturing device and transferring the image of the seal of the tube from the image capturing device to the processing device.

12. The automated method as claimed in claim 11 , comprising processing the captured image of the seal of the tube to classify a quality of the seal of the tube by the processing device, using a mathematical function generated by artificial neural networks.

13. The automated method as claimed in claim 12 , wherein processing the captured image of the seal of the tube comprises:
selecting a candidate architecture and candidate parameters for each artificial neural network; and
determining an ensemble of artificial neural networks which satisfies a validation threshold, from the plurality of artificial neural networks; and
aggregating predictions from the ensemble of the artificial neural networks to classify the quality of the seal of the tube as one of a plurality of quality categories.

14. The automated method as claimed in claim 12 , comprising updating the mathematical function based on the classified quality of the seal of the tube.

15. The automated method as claimed in claim 12 , comprising predicting a failure of the sealing system based on the classified quality of the seal of the tube.

16. A sealing system for sealing a tube, the sealing system comprising:
a first sealing plate;
a drive unit; a second sealing plate disposed spaced apart from the first sealing plate, wherein at least one of the first and second sealing plates is coupled to the drive unit for causing relative movement of the first and second sealing plates;
a heater capable of heat sealing the tube disposable in a space between the first and second plates;
an illuminating source for directing illuminating rays towards the space;
an image capturing device for capturing an image of at least a portion of the tube in the space; and
a processing device coupled to the image capturing device, the heater, and the drive unit, wherein the processing device is configured to:
receive the captured image of the at least portion of the tube from the image capturing device; determine a plurality of tube parameters based on the captured image of the at least portion of the tube, using an image processing technique; determine a plurality of sealing parameters from a database based on the determined plurality of tube parameters; and
control the drive unit and the heater by the processing device influenced at least in part by the determined plurality of sealing parameters, to respectively compress the tube and perform heat sealing of the tube, wherein the compressing of the tube and the performing of the heat sealing of the tube occurs after the determining of the plurality of sealing parameters.

17. The sealing system as claimed in claim 16 , wherein the plurality of tube parameters comprises one or more of an outer diameter of the tube, an inner diameter of the tube, and a material of the tube.

18. The sealing system as claimed in claim 16 , wherein the plurality of sealing parameters comprises a torque of the drive unit, a heating temperature of the heater, a movement distance of the first sealing plate from a start location to a tube sealing location proximate to the second sealing plate, and at least one of a time

Assignees

• Cytiva Sweden Ab

Inventors

• Lakhani Hanish
• Hosamani Preetam
• Garg Nishu
• Savarimuthu Bhaskaran
• Kannuri Srihari
• Ezzy Juzar Mazhar
• Balaguru Ramu

Classifications

• B29C66/965 Primary

  using artificial neural networks · CPC title

• B29C65/04

  Dielectric heating, e.g. high-frequency welding {, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC} · CPC title

• B29C65/1425

  Microwave radiation · CPC title

• B29C65/16

  Laser beams · CPC title

• B29C65/8253

  by the use of waves or particle radiation, e.g. visual examination, scanning electron microscopy, or X-rays (B29C65/8292 takes precedence) · CPC title