CategoryMaterials & Sheet Quality
Separate moisture-related bubbles in ABS sheet from overheating, extrusion voids, contamination, and surface degradation, then correct handling and drying.
- Symptom
- Bubbles & Blisters
- Cause
- Moisture & Material Condition, Heating & Temperature
- Material
- ABS
CategoryMaterials & Sheet Quality
Recognize ABS overheating through gloss change, color shift, odor, surface instability, sag, and property loss, then correct heat exposure and material condition.
- Symptom
- Burns & Discoloration, Surface Appearance
- Cause
- Heating & Temperature, Moisture & Material Condition
- Material
- ABS
CategoryMaterials & Sheet Quality
Prevent fine cracks in thermoformed acrylic by controlling forming stress, moisture, machining, flame polishing, assembly load, and chemical exposure.
- Symptom
- Tearing, Cracking & Whitening
- Cause
- Moisture & Material Condition, Contamination & Handling
- Material
- Acrylic / PMMA
CategoryMaterials & Sheet Quality
Correct dull acrylic surfaces and weak detail by balancing forming temperature, tool finish, air evacuation, sheet type, stretch, and contact pressure.
- Symptom
- Surface Appearance, Poor Detail & Incomplete Forming
- Cause
- Heating & Temperature, Moisture & Material Condition
- Material
- Acrylic / PMMA
CategoryVacuum, Pressure & Pneumatics
Identify localized air burn caused by rapid compression of trapped gas and correct venting, first-contact sequence, airflow, and pressure application.
- Symptom
- Burns & Discoloration
- Cause
- Pressure & Airflow, Vacuum & Venting
- Material
- General / Multiple Materials
CategoryVacuum, Pressure & Pneumatics
Diagnose trapped-air pockets, dull areas, and incomplete contact caused by sealed flow paths, smooth tools, poor vent placement, or early sheet contact.
- Symptom
- Poor Detail & Incomplete Forming
- Cause
- Vacuum & Venting, Mold Geometry & Material Distribution
- Material
- General / Multiple Materials
CategoryMold Design & Material Distribution
Correct one-sided thinning and uneven draw caused by asymmetric geometry, thermal gradients, plug misalignment, sheet position, or directional sheet properties.
- Symptom
- Thinning & Thickness Variation, Process Variation & Asymmetry
- Cause
- Mold Geometry & Material Distribution, Heating & Temperature
- Material
- General / Multiple Materials
CategoryProcess Control & Machine Diagnostics
Correct uneven tool closure, plug position, sealing, and draw caused by platen tilt, axis desynchronization, guide wear, frame deflection, or setup error.
- Symptom
- Process Variation & Asymmetry
- Cause
- Machine Setup & Controls, Mold Geometry & Material Distribution
- Material
- General / Multiple Materials
CategoryTrimming & Secondary Operations
Prevent reinforced thermoformed shells from warping or blistering because of resin exotherm, cure shrinkage, poor adhesion, moisture, or uneven backing.
- Symptom
- Warping & Dimensional Distortion
- Cause
- Cooling, Shrinkage & Release, Moisture & Material Condition
- Material
- General / Multiple Materials
CategoryCooling, Shrinkage & Demolding
Locate restricted or blocked mold cooling passages that create hot zones, long cycles, sticking, warpage, gloss differences, or cavity imbalance.
- Symptom
- Warping & Dimensional Distortion
- Cause
- Cooling, Shrinkage & Release, Contamination & Handling
- Material
- General / Multiple Materials
CategoryVacuum, Pressure & Pneumatics
Recognize blocked mold vents that cause local soft detail, trapped air, dull spots, and recurring incomplete features, then restore the air path safely.
- Symptom
- Poor Detail & Incomplete Forming
- Cause
- Vacuum & Venting, Contamination & Handling
- Material
- General / Multiple Materials
CategoryTrimming & Secondary Operations
Diagnose weak adhesive bonds caused by contamination, incompatible chemistry, residual stress, surface treatment, poor fit, moisture, or cure conditions.
- Symptom
- Tearing, Cracking & Whitening
- Cause
- Contamination & Handling, Moisture & Material Condition
- Material
- General / Multiple Materials
CategoryHeating & Sheet Temperature
Diagnose sharp sheet splits caused by low forming temperature, cold tooling, damaged edges, aggressive plug motion, sharp radii, or excessive draw.
- Symptom
- Tearing, Cracking & Whitening
- Cause
- Heating & Temperature, Mold Geometry & Material Distribution
- Material
- General / Multiple Materials
CategoryTrimming & Secondary Operations
Reduce burrs, feathered edges, and polymer whiskers by correcting tool sharpness, punch clearance, cutting direction, support, and trim temperature.
- Symptom
- Surface Appearance
- Cause
- Machine Setup & Controls, Moisture & Material Condition
- Material
- General / Multiple Materials
CategoryMold Design & Material Distribution
Identify chill marks created by premature contact with a cold mold or plug and correct tool temperature, contact sequence, surface finish, and sheet condition.
- Symptom
- Surface Appearance
- Cause
- Heating & Temperature, Mold Geometry & Material Distribution
- Material
- General / Multiple Materials
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