A plastic housing had visible sink marks above its internal ribs. This example shows how an engineering team can investigate the issue, agree on a part change, and check new samples before production.
Case Summary
Client Challenge
In this scenario, an equipment manufacturer found shallow depressions on the visible face of a molded housing. The marks appeared opposite internal ribs and remained noticeable under the lighting used for the customer's incoming inspection.
The housing also had to fit an existing assembly. Any change therefore needed to address the appearance problem while preserving the mounting features and agreed dimensions. The buyer supplied the part model, drawing, resin specification, and reference samples for review.
What Vicmold Did
Compared the Marks With the Part Design
The example review mapped the visible marks to the rib locations and examined the local wall thickness. The buyer and engineering team agreed which surfaces mattered for appearance and which dimensions had to remain unchanged.
Checked the Molding Conditions
Controlled trials examined the effect of packing and cooling conditions using the specified resin. Samples were compared under the same inspection conditions, with checks for flash and dimensional changes as well as surface appearance.
Agreed on a Local Design Change
In this fictional example, process adjustments alone did not meet the agreed appearance standard. The proposed change reduced material concentration at the affected rib junctions. The buyer reviewed the effect on fit and function before approving the corresponding mold modification.
Inspected Revised Trial Samples
New samples were checked for appearance and the agreed dimensions, then sent to the buyer for assembly review. The approved sample and inspection requirements were recorded before the production order was released.
Project Result
In this illustrative outcome, the revised samples met the buyer's agreed appearance requirements and passed the assembly review. Approval covered the modified part design and the sample submitted for production release.
- The affected appearance areas and inspection conditions were clearly defined.
- The buyer approved the design change before the mold was modified.
- Appearance and assembly were checked together before production release.
This example does not claim a measured reduction in rejects, cost savings, or a guaranteed remedy for other parts.