CategoryPre-Stretch & Plug Assist
Excessive Pre-Stretch in Thermoforming
Recognize overextended pre-stretch bubbles that cause early thinning, rupture, unstable contact, and poor final wall distribution.
Thermoforming Wiki
Diagnose thermoforming defects by symptom, cause, process area, and material.
CategoryHeating & Sheet Temperature
Excessive Sheet Sag During Thermoforming
Understand excessive or unstable sheet sag during thermoforming and correct heat input, material variation, drafts, clamping, and sag control.
CategoryVacuum, Pressure & Pneumatics
Excessive Vacuum Dead Volume
Diagnose slow forming caused by oversized vacuum boxes, unused cavities, long manifolds, and trapped system volume that must be evacuated every cycle.
CategoryMold Design & Material Distribution
Feature Collapse After Thermoforming
Prevent ribs, bosses, and deep features from collapsing during cooling or release by improving local thickness, support, cooling, venting, and geometry.
CategorySurface Quality & Contamination
Flow Marks on Thermoformed Parts
Trace flow marks to nonuniform sheet movement, thermal gradients, plug drag, contamination, extrusion bands, or local sticking during forming.
CategorySurface Quality & Contamination
Gloss Variation in Thermoforming
Diagnose patchy gloss caused by local temperature, tool finish, trapped air, pressure, sheet orientation, contamination, or uneven contact.
CategoryMaterials & Sheet Quality
HIPS Brittleness During Forming
Diagnose cracking and brittle tearing in HIPS caused by low sheet temperature, aging, recycled content, sharp geometry, orientation, or unsuitable grade.
CategoryProcess Control & Machine Diagnostics
Heater Element Failure
Diagnose open, shorted, partially failed, or mechanically damaged heater elements that create cold bands, hot spots, slow cycles, and uneven sag.
CategoryProcess Control & Machine Diagnostics
Heater Power Imbalance
Correct unequal electrical power between heater zones or phases that causes asymmetric heating, slow response, recurring hot and cold regions, or overload.
CategoryProcess Control & Machine Diagnostics
Heater Reflector Contamination
Restore radiant heating lost to dust, resin vapor, oil, oxidation, damaged coatings, and warped reflectors behind thermoforming heater elements.