Pacorr’s Polariscope Strain Viewer is a specialized instrument used to detect stress patterns, birefringence, and hidden defects in transparent products such as PET bottles, containers, and optical parts. It helps manufacturers ensure structural consistency, visual clarity, and safety by inspecting internal strains that may not be visible to the naked eye.
This testing is critical in the packaging industry, especially for PET bottle manufacturers, where uneven cooling, poor molding, or handling stress can compromise product quality and customer satisfaction
- Shipping Area: All over the world
- Model: PSP-1
Key Features
- Dual light source – monochromatic and polarized
- Compact and table-top design
- Comes with standard strain interpretation chart
- High transmission LED illumination
- Suitable for PET preforms and blow-molded bottles
- Optional digital model with camera and software analysis
Technical Specifications
- Viewing Area: 260 x 260 mm
- Light Source: LED / CFL
- Observation Modes: White light and polarized light
- Frame Material: Powder-coated steel or acrylic (as per model)
- Compatible Sample Types: Preforms, containers, bottle necks
- Operation: Manual or digital
Applications
- PET bottle manufacturing
- Preform quality testing
- Cosmetic packaging inspection
- Pharmaceutical bottle QC
- Transparent molded parts analysis
- Laboratory R&D for polymers and plastics
Why Strain Detection Matters
- Identifies molding defects due to temperature variation
- Ensures clarity and aesthetic appeal of transparent packaging
- Prevents micro-cracks and structural failure under pressure
- Helps calibrate blow molding machine settings
- Reduces product rejection due to internal stress
Real Industry Use Case – PET Bottle Manufacturer
- Client: A beverage bottling unit producing 25,000 bottles per day
- Problem: Bottles showed cracking at necks during capping process
- Pacorr's Solution: Installed Polariscope Viewer for neck and preform inspection
- Result: Detected uneven stress during preform heating and fixed the blow molder temperature profile
- Impact: 80 percent reduction in bottle rejection and smoother production runs
Working Principle
The Polariscope Strain Viewer works by passing polarized light through a transparent sample. If internal stresses exist, they alter the light path, producing visible color patterns or fringe lines. These patterns can be interpreted using the reference chart provided to determine the type and location of the strain.
Stress Pattern Types Detected
- Birefringence due to uneven cooling
- Molding distortion at neck or base
- Non-uniform wall thickness strain
- Thermal stress post-manufacturing
- Residual stress from packaging or capping
Suitable Products for Testing
- PET bottles of all sizes
- Preforms of 19 mm, 28 mm, 38 mm neck
- Transparent jars and containers
- Plastic droppers and tubes
- Ampoules and small vials
Benefits of Using Pacorr’s Polariscope
- Ensures consistent product quality before filling
- Prevents customer complaints due to leaking or broken containers
- Reduces production downtime by identifying defects early
- Supports validation of molding machine settings
- Enhances visual quality and brand perception
Model Options Available
- Standard Polariscope Viewer – Manual operation with white and polarized light
- Digital Polariscope Viewer – Integrated camera with software for image recording
- Mini Polariscope – Portable model for preform and cap neck inspection
Compliant Standards and Guidelines
- IS 14434 – Indian standard for PET bottle quality inspection
- ASTM D1003 – Haze and clarity measurement in transparent plastics
- ISO 22007-2 – Determination of stress birefringence
- Customized tests for QC protocols of leading beverage brands
How to Use the Polariscope Strain Viewer
- Switch on the light source
- Place the transparent sample on the viewing stage
- Observe the sample under white light and polarized light
- Identify color fringes, stress points, or clarity issues
- Refer to the strain chart for evaluation
- Accept or reject based on visual pattern
Frequently Asked Questions (FAQ)
Q1. What is the use of a Polariscope Strain Viewer
It is used to detect internal stress and birefringence in PET bottles preforms and transparent materials for quality assurance.
Q2. Can it detect defects in plastic caps or vials
Yes it can be used for transparent caps vials ampoules and molded plastic items.
Q3. Is the Polariscope available in a digital model
Yes Pacorr offers a digital model with camera and software for recording and analysis.
Q4. What is the price range of Polariscope Strain Viewer in India
Depending on the model features and viewing size the price ranges from 28000 to 95000 INR.
Q5. How is it different from visual inspection
Polariscope reveals internal stress invisible to the eye using polarized light making it much more accurate than simple visual checks.
Ensure your transparent packaging passes every quality check with confidence.
Get the Pacorr Polariscope Strain Viewer today.
Call us at +91-8882149230 or email [email protected] for a demo or quotation.
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Thanks to Pacorr Testing instruments, we have all the required quality testing instruments that have helped us to ensure the best quality delivered to our clients.
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