Trouble Shooting
Molding Defects
Weld lines
The term "weld line" is used to describe the narrow V-shaped line that occurs at the point where two different flow fronts meet.
| Characteristics |
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| Cause |
Molding
conditions
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Die Conditions
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Die conditions
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Molding Machine Conditions
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| Countermeasures |
There is no theoretical means for its elimination; accordingly, its effect must be minimized or the resulting marks must be moved from a decorative face to a side face. To the untrained eye, a weld line may seem to be a crack. In terms of product specifications, the presence of weld lines in areas of stress concentrations may lead to strength problems, and therefore, countermeasures should be implemented in advance. Shaping conditions used to minimize weld lines
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Verification : Die temperature which is most effective in minimizing weld lines
 |
 |
| Normal molding Die temperature: 40deg.C Weld section (central) Width: Approximately 10 mm Depth: Approximately 120 mm |
High-speed heat and cool molding Die temperature: 100deg.C Weld section (central) Not visible with the naked eye |
UMG ABS Ltd. accepts no responsibility for the quality or safety of any customer products which use our materials or which have made use of any type of data provided by this company.
Customers are requested to independently determine the suitability of our materials for their products. We also request that sufficient attention also be paid to laws, regulations, and industrial rights.
| Characteristics |
|
|||
|---|---|---|---|---|
| Cause |
Molding
conditions
|
Die Conditions
|
Die conditions
|
Molding Machine Conditions
|
|
|
|
|
|
| Countermeasures |
There is no theoretical means for its elimination; accordingly, its effect must be minimized or the resulting marks must be moved from a decorative face to a side face. To the untrained eye, a weld line may seem to be a crack. In terms of product specifications, the presence of weld lines in areas of stress concentrations may lead to strength problems, and therefore, countermeasures should be implemented in advance. Shaping conditions used to minimize weld lines
|
|||
Verification : Die temperature which is most effective in minimizing weld lines
|
|
| Normal molding Die temperature: 40deg.C Weld section (central) Width: Approximately 10 mm Depth: Approximately 120 mm |
High-speed heat and cool molding Die temperature: 100deg.C Weld section (central) Not visible with the naked eye |
UMG ABS Ltd. accepts no responsibility for the quality or safety of any customer products which use our materials or which have made use of any type of data provided by this company.
Customers are requested to independently determine the suitability of our materials for their products. We also request that sufficient attention also be paid to laws, regulations, and industrial rights.
