ABCOLN FASHIONS
PVC Patch Glossary: Part 5: Quality Control, Defects and Testing: Essentials of Premium PVC
Broad Categorization and Glossary of:
How is PVC Quality Evaluated
PVC Patch Glossary: Pillar 5
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5.1 Fabrication & Mold Defects
Defining physical defects caused by molding, tooling, dispensing, layering, or fabrication processes
- Flash: Thin excess PVC extending beyond the intended Patch geometry or mold parting area.
- Burr: An unwanted sharp or raised edge of excess material remaining after molding or trimming.
- Short Shot: An incomplete fill where PVC fails to fully occupy the intended mold cavity or detail.
- Air Bubble: A trapped pocket of air within or beneath the PVC surface. Problems and Solutions for Bubbling: Link
- Pinhole: A small opening or void in the PVC surface caused by trapped air, contamination, or incomplete material formation.
- Tooling Mark: An unintended line, impression, scratch, or surface feature transferred from the mold or tooling.
- Mold Shift: Misalignment between mold sections or tooling features resulting in displaced Patch details.
- Misregistration: Incorrect alignment between colors, layers, graphics, or dimensional elements.
- Incomplete Detail: A design feature that fails to fully reproduce its intended shape, depth, or definition.
- Warping: Unintended bending, twisting, or deformation of the Patch from its specified shape.
- Surface Void: An unintended cavity or depression caused by incomplete filling, trapped air, or material displacement.
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5.2 Material & Curing Failures
Defining defects caused by material formulation, contamination, curing conditions, or material instability
- Under-Curing: Insufficient heat or curing time resulting in PVC that has not fully developed its intended physical properties.
- Tackiness: An unwanted sticky or adhesive surface caused by incomplete curing or material formulation issues.
- Over-Curing: Excessive heat or curing time that can alter the intended hardness, flexibility, color, or surface characteristics.
- Scorching: Thermal damage caused by excessive heat exposure, resulting in discoloration or degraded PVC.
- Delamination: Separation between PVC layers, backing materials, or bonded components.
- Plasticizer Migration: Movement of plasticizer through or out of the PVC, potentially causing surface changes or contamination of adjacent materials.
- Oil Sweating: Visible oily or greasy residue appearing on the PVC surface due to migration of plasticizers or other formulation components.
- Color Bleeding: Unwanted transfer of color or pigment between adjacent layers or materials.
- Material Contamination: Unwanted foreign material or chemical contamination introduced during formulation or production.
- Brittleness: Excessive loss of flexibility causing the PVC to crack, fracture, or break under normal stress.
- Cracking: Visible fractures or splits within the PVC caused by material weakness, environmental exposure, stress, or improper curing.
5.3 Surface & Cosmetic Defects
Defining visible surface imperfections, appearance variations, and cosmetic inconsistencies in the finished Patch
- Color Variation: A visible difference in color between the Patch, its intended target, or production units.
- Color Drift: A gradual shift from the approved color target during production or between production batches.
- Surface Blemish: An unintended visible imperfection affecting the appearance of the PVC surface.
- Surface Scratches: Unwanted marks, lines, or abrasions visible on the Patch surface.
- Texture Variation: An unintended difference in surface texture, pattern, or tactile finish.
- Gloss Variation: An inconsistent level of surface reflectivity between areas of the Patch or between production units.
- Discoloration: An unintended change in the original or specified PVC color.
- Contamination: Visible foreign particles, debris, fibers, residue, or other unwanted material embedded in or on the Patch.
- Surface Pitting: Small depressions or irregular cavities visible on the finished surface.
- Sink Mark: A localized depression caused by material shrinkage or uneven cooling during production.
- Uneven Finish: An inconsistent surface appearance resulting from variations in curing, tooling, material distribution, or finishing.
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5.4 Physical & Environmental Testing
Defining tests used to measure Patch durability, material performance, attachment strength, and environmental resistance
- Shore A Durometer: A standardized instrument and scale used to measure the hardness of flexible PVC.
- Peel Strength: The force required to separate an adhesive, backing, or bonded layer from its attached surface.
- Adhesion Strength: The force required to separate bonded Patch components or attachment materials.
- Tensile Strength: The maximum pulling stress a PVC material can withstand before breaking.
- Tear Strength: The resistance of PVC to continued tearing after an initial cut or defect.
- Flex Testing: Repeated bending or flexing used to evaluate resistance to cracking, separation, or structural failure.
- Abrasion Testing: Controlled rubbing or wear testing used to evaluate surface durability.
- UV Weathering: Accelerated ultraviolet exposure used to evaluate fading, discoloration, cracking, and material degradation.
- Temperature Cycling: Repeated exposure to defined hot and cold conditions used to evaluate dimensional and material stability.
- Cold-Crack Resistance: The ability of PVC to resist cracking or fracture when exposed to low temperatures.
- Humidity Resistance: The ability of the Patch and its components to withstand prolonged exposure to moisture and elevated humidity.
- Dimensional Stability Testing: Measurement of changes in Patch shape or dimensions after environmental or physical exposure.
5.5 Inspection & Acceptance
Defining the procedures, tolerances, and acceptance criteria used to determine whether a finished Patch meets specifications
- Visual Inspection: Examination of the finished Patch for visible defects, workmanship, color, detail, and overall appearance.
- Dimensional Inspection: Measurement of the Patch against specified size, thickness, height, and geometric tolerances.
- Dimensional Tolerance: The permitted variation from the specified physical dimensions of the Patch.
- Color Tolerance: The permitted variation from the approved color target.
- AQL (Acceptable Quality Limit): A statistical sampling method used to determine whether a production batch meets defined quality requirements.
- First Article Inspection: Detailed inspection of the first production unit or initial production sample against approved specifications.
- Production Sample: A representative Patch selected from a production run for inspection or testing.
- Defect Classification: Categorization of defects according to their severity and effect on appearance, function, or safety.
- Critical Defect: A defect that could create a safety concern or cause the Patch to fail a critical requirement.
- Major Defect: A defect that materially affects the Patch's appearance, function, durability, or specification.
- Minor Defect: A small imperfection that does not materially affect the Patch's intended function or overall quality.
- Rework: Corrective processing performed to bring a Patch back into specification.
- Reject: A Patch or production batch determined to be outside acceptable specifications and unsuitable for shipment or use.
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