CategoryMold Design & Material Distribution
Correct sheet bridging across recesses or between features by changing heat, pre-stretch, venting, cavity spacing, downholders, and contact sequence.
- Symptom
- Folds, Webbing & Bridging
- Cause
- Mold Geometry & Material Distribution, Vacuum & Venting
- Material
- General / Multiple Materials
CategoryCooling, Shrinkage & Demolding
Eliminate drag and scuff marks caused by low draft, rough tool surfaces, contamination, shrinkage, misalignment, or premature release.
- Symptom
- Surface Appearance, Sticking & Release Damage
- Cause
- Cooling, Shrinkage & Release, Contamination & Handling
- Material
- General / Multiple Materials
CategorySurface Quality & Contamination
Eliminate recurring spots, pits, scratches, and pickup marks transferred from damaged, dirty, corroded, or poorly repaired thermoforming tools.
- Symptom
- Surface Appearance
- Cause
- Mold Geometry & Material Distribution, Contamination & Handling
- Material
- General / Multiple Materials
CategoryCooling, Shrinkage & Demolding
Diagnose gradual mold temperature change that alters cooling time, shrinkage, release, detail, gloss, and dimensional stability during a production run.
- Symptom
- Warping & Dimensional Distortion, Process Variation & Asymmetry
- Cause
- Cooling, Shrinkage & Release, Machine Setup & Controls
- Material
- General / Multiple Materials
CategoryMold Design & Material Distribution
Control dimensional drift caused by nonuniform mold temperature, thermal expansion, cooling-circuit imbalance, weak support, or unstable startup conditions.
- Symptom
- Warping & Dimensional Distortion
- Cause
- Cooling, Shrinkage & Release, Machine Setup & Controls
- Material
- General / Multiple Materials
CategoryClamping, Sheet Loading & Tool Setup
Find leakage between the mold, baseboard, vacuum box, inserts, and mounting hardware that weakens local or overall thermoforming vacuum.
- Symptom
- Poor Detail & Incomplete Forming, Process Variation & Asymmetry
- Cause
- Mold Geometry & Material Distribution, Vacuum & Venting
- Material
- General / Multiple Materials
CategoryCooling, Shrinkage & Demolding
Correct cavity-to-cavity temperature differences that produce unequal shrinkage, release timing, dimensions, gloss, and cycle stability.
- Symptom
- Warping & Dimensional Distortion, Process Variation & Asymmetry
- Cause
- Cooling, Shrinkage & Release, Machine Setup & Controls
- Material
- General / Multiple Materials
CategoryMold Design & Material Distribution
Correct cavity-to-cavity thickness variation caused by thermal gradients, unequal draw demand, plug differences, sheet tension, and array layout.
- Symptom
- Thinning & Thickness Variation, Process Variation & Asymmetry
- Cause
- Mold Geometry & Material Distribution, Heating & Temperature
- Material
- General / Multiple Materials
CategoryVacuum, Pressure & Pneumatics
Correct cavities that form at different rates because of unequal venting, manifold resistance, local leaks, thermal gradients, or cavity position.
- Symptom
- Process Variation & Asymmetry
- Cause
- Vacuum & Venting, Mold Geometry & Material Distribution
- Material
- General / Multiple Materials
CategoryTrimming & Secondary Operations
Prevent layer separation at trimmed edges by checking tie-layer strength, moisture, forming strain, cutter condition, support, impact, and cut direction.
- Symptom
- Tearing, Cracking & Whitening
- Cause
- Moisture & Material Condition, Machine Setup & Controls
- Material
- General / Multiple Materials
CategoryMold Design & Material Distribution
Diagnose unstable flat panels that pop or rock after forming and correct geometry, thickness, cooling, residual stress, support, and trim conditions.
- Symptom
- Warping & Dimensional Distortion
- Cause
- Mold Geometry & Material Distribution, Cooling, Shrinkage & Release
- Material
- General / Multiple Materials
CategorySurface Quality & Contamination
Identify oil and lubricant contamination that causes stains, adhesion loss, surface defects, smoke, or bonding failure and remove its source safely.
- Symptom
- Surface Appearance
- Cause
- Contamination & Handling
- Material
- General / Multiple Materials
CategoryHeating & Sheet Temperature
Diagnose orange peel texture on thermoformed parts and correct excessive heat soak, unstable sheet surfaces, uneven heating, or incoming-sheet defects.
- Symptom
- Surface Appearance
- Cause
- Heating & Temperature, Moisture & Material Condition
- Material
- General / Multiple Materials
CategoryCooling, Shrinkage & Demolding
Diagnose parts that stick because of insufficient draft, shrinkage, hot release, roughness, contamination, vacuum lock, or a true undercut.
- Symptom
- Sticking & Release Damage
- Cause
- Cooling, Shrinkage & Release, Mold Geometry & Material Distribution
- Material
- General / Multiple Materials
CategoryMaterials & Sheet Quality
Understand whitening and haze from PET crystallization and control resin history, sheet heating, dwell, forming speed, mold temperature, and cooling.
- Symptom
- Warping & Dimensional Distortion
- Cause
- Heating & Temperature, Moisture & Material Condition
- Material
- PET
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