GBPI GH-D – Electronic Thickness Tester (Sub-Micron Contact Gauge Apparatus)
- High-precision automated electronic thickness tester for plastic films, sheets, papers, and foil barrier laminates
- Full testing compliance with ASTM D374, ASTM D645, ISO 4593, ISO 534, TAPPI T411, and DIN 53105
- Ultra-fine mechanical displacement resolution of 0.1 μm (0.0001 mm) with measuring range up to 6 mm
- Standardized contact mechanical probe with strictly regulated contact pressure (17.5 ± 1 kPa or customized)
- Automated motorized probe descent and optional automatic specimen web feeder for multi-point profile testing
- Integrated touch-screen interface displaying real-time thickness, multi-point average, maximum/minimum, and deviation
- Indispensable quality control apparatus for blown film extrusion lines, paper mills, and pharmaceutical foil converting
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The GBPI GH-D is an advanced, high-resolution contact mechanical electronic thickness tester engineered for the micrometer-level dimensional quantification of flexible plastic films, laminated barrier webs, sheet materials, paperboards, metal foils, and non-woven textiles. Built in rigorous accordance with internationally recognized physical metrology criteria—including ASTM D374 (standard test methods for thickness of solid electrical insulation), ISO 4593 (plastics film and sheeting determination of thickness by mechanical scanning), ISO 534, and TAPPI T411—this instrument serves as the definitive reference standard for film gauge consistency.
Film thickness is the primary physical baseline that governs water vapor permeation, oxygen barrier transmission rates, tensile strength, heat seal integrity, and raw material conversion costs. Subtle cross-direction gauge bands or machine-direction thickness fluctuations cause roll unevenness, wrinkling during high-speed printing, and premature pouch seal failure. Functioning as a high-precision electronic thickness tester, the GH-D lowers a flat, precision-ground circular contact foot onto the specimen supported on a heavy granite and hardened steel anvil under an exact, standardized deadweight contact pressure.
Sub-Micron Displacement Resolution & Automated Contact Cycle
The instrument incorporates an ultra-precise linear inductive displacement sensor delivering a resolution of 0.1 microns (0.0001 mm). To completely eliminate human operational variability and specimen dynamic indentation shock, crosshead descent is governed by a micro-stepping motor that gently lowers the contact probe at a controlled velocity of 1.5 to 2.5 mm/s.
Multi-Point Automated Specimen Feeding
Equipped with an optional programmable specimen step-feeder, the GH-D automatically advances continuous film strip specimens through up to 30 sequential measurement stations. The onboard microprocessor calculates real-time thickness profiles, range, variance, and standard deviation curves across the entire web sample.
Widely adopted by film extruders, paper converters, battery separator manufacturers, and third-party inspection laboratories, the GH-D delivers objective, certified thickness verification to maintain tight extrusion tolerances and optimize material yields.
GBPI GH-D Electronic Thickness Tester – Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Test Principle | Contact Mechanical Deadweight Inductive Displacement Method |
| Applicable Standards | ASTM D374, ASTM D645, ASTM D1777, ISO 4593, ISO 534, TAPPI T411, DIN 53105 |
| Thickness Measuring Range | 0 to 2 mm (Standard) / 0 to 6 mm (Extended Range Optional) |
| Measurement Resolution | 0.1 μm (0.0001 mm / 0.004 mil) |
| Measurement Accuracy & Linearity | ±0.5 μm (Over full calibrated measuring span) |
| Contact Pressure | 17.5 ± 1 kPa (Film standard) / 50 ± 1 kPa / 100 ± 2 kPa (Paper standard) |
| Contact Foot Area | 50 mm² (Φ8.0 ± 0.1 mm) Film / 200 mm² (Φ16.0 ± 0.1 mm) Paper |
| Automated Test Point Programming | 1 to 30 measurement points per continuous specimen strip |
| Probe Lowering Speed | 1.5 mm/s to 2.5 mm/s (Controlled motorized gentle landing) |
| Overall Instrument Dimensions | 460 mm (L) × 360 mm (W) × 440 mm (H) |
| Total Instrument Net Weight | Approximately 32 kg (High-mass vibration-damping anvil) |
| Electrical Supply Requirements | AC 220V ± 10%, 50 Hz / 60 Hz Single Phase |
Key Performance Features of the GBPI GH-D
- Sub-Micron 0.1 μm Precision: High-stability inductive sensor accurately resolves thickness variations down to one-tenth of a micron, providing certified data for high-barrier films and battery separators.
- Standardized Mechanical Deadweight: Applies exact gravitational contact pressure without spring fatigue, meeting the strict mechanical contact criteria of ASTM D374 and ISO 4593.
- Vibration-Isolated Granite Base: Heavy solid granite and hardened tool steel anvil base eliminates environmental shop floor vibrations and thermal expansion errors.
- Motorized Controlled Probe Velocity: Stepper motor crosshead lowers the contact foot smoothly, preventing material deformation or localized indentation bounce.
- Automated Strip Feeder Option: Automatically indexes roll film strips across up to 30 sequential measurement locations to map cross-web thickness profiles effortlessly.
- Microprocessor Statistical Analysis: Digital touchscreen console calculates average thickness, maximum, minimum, range, and standard deviation with integrated thermal printing.
Standard Package & Accessories
| Item | Description | Quantity | Type |
|---|---|---|---|
| 1 | GH-D Electronic Thickness Tester Mainframe with Color Touchscreen | 1 Set | Standard |
| 2 | Standard Flat Contact Measurement Foot (Film / Paper Specified) | 1 Pc | Standard |
| 3 | Precision Standard Gauge Block Set for Calibration Verification | 1 Set | Standard |
| 4 | Motorized Specimen Automatic Strip Feeder Assembly | 1 Set | Optional |
| 5 | Standard Power Cable and Ground Wire | 1 Set | Standard |
| 6 | Factory Calibration Verification Certificate and Operation Guide | 1 Set | Standard |
Primary Testing Applications
Plastic Packaging Films & Pouches
Thickness gauge uniformity verification for BOPP, BOPET, BOPA, LDPE, and coextruded high-barrier film rolls before printing and lamination.
Battery Separator Membranes
Sub-micron thickness profile qualification for ultra-thin microporous polyethylene (PE) and polypropylene (PP) lithium-ion battery separator films.
Paper, Board & Synthetic Sheets
Caliper thickness measurement for pharmaceutical folding cartons, aseptic liquid packaging boards, release liners, and synthetic paper webs per TAPPI T411.
Aluminum Foils & Metallic Barrier Webs
Direct micrometer verification of pharmaceutical blister lidding aluminum foils (20 to 25 micron) and ultra-thin aseptic foil layers (6 to 9 micron).