Cut-down flange I - Metal can defects

Cut-down flange I - Metal can defects - Coating defects

Figure 1: Cut-down flange.

Defect name: Cut-down flange
Record No.: 1504
Type of defect (Internal/Surface): Surface
Defect classification: Coating defects, metal can defects
Steel name: Steel
Steel composition in weight %: No data.
Note:
Classification: A cut-down flange is considered a serious seam defect due to the absence of overlap.
Description: A portion of the body flange which is torn or cut with part of the flange turned back against the can body, without being engaged with the end hook, and may protrude below the bottom of the normal seam. Severe forms of this defect result in a hole in the can body just below the double seam.
A unique type of CDF is the "index fault" found on reformed cans which consists of a characteristic tear in the flange approximately 10-15 mm from the reform ridge on the can body, due to flange damage caused by the reformer picker finger.
Common sources: 1. Flange damage during handling of open top cans. 2. Flange damage during filling. 3. Flange damage from other canning line equipment. 4. Flange damage from the grip chain during formation of the can body cylinder. 5. Mis-indexing of collapsed can body blanks during reforming.
Reference: Not shown in this demonstration version.