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Automated optical inspection of drill holes in spinnerets Disclosure Number: IPCOM000019995D
Original Publication Date: 2003-Oct-16
Included in the Prior Art Database: 2003-Oct-16

Publishing Venue



This invention disclosure describes the implementation of a completely automated optical inspection of drill holes (capillaries) in spinnerets. Those spinnerets are used for example in the textile industry for production of single filaments which are combined to form textile fibers. During production the spinnerets and especially the capillaries get soiled and blocked which has negative impact on the product quality. Therefore, it is necessary to inspect spinnerets regulary with respect to the defects mentioned before.

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Automated optical inspection of drill holes in spinnerets

  Using current systems the inspection of spinnerets is mainly semi-automated i.e. an operator has to check each capillary of a spinneret using e.g a microscope. Existing automated tool for spinneret inspection (e.g. Projectina ASPI) only check the lower side of the capillaries with respect to contamination of the profile cross section.

    Using this novel method for inspection of spinnerets, by means of a combination of different illumination and imaging optics a full set of spinneret parameters can be obtained.

Figure 1 shows the schematic setup of the inspection system:

The automated inspection of the spinneret capillaries is as follows:
(1) Optic 2: Detection of all capillaries from the lower side of the spinneret: Therefore, zoom 2 is shifted to maximum field-of-view (FOV) position. Illumination 1 of optic 1 is used to generate the transmitted light for this view. The positions of the capillaries in this so-called global FOV are detected by means of an integrated image analysis and stored for further evaluation.

Figure 2: Example of an CCD-image in the global field-of-view

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    (2) Optic 2: sequential inspection of the single capillaries at the lower side of the spinneret: Zoom 2 is shifted to minimum FOV. In this case only a single capillary (profile cross section) is imaged onto CCD2. The previously detected positions of the capillaries are shifted one by one under the microscope objective. By using integrated image analysis the inspectio...