KR-720 Automated Free Falling Dart Impact Tester for Flexible Packaging Films
RT-720 High Precision Drop Falling Dart Impact Tester
Apply to plastic film or chip which thickness less than 1mm impact by fall darts in a given great freedom to fall, test the impact quality and energy were when 50% plastic film or chip was damaged.
Product Details：
Product Brief
The KR-720 automatic free dart drop impact testing unit is a precision lab instrument dedicated to evaluating anti-shock toughness of thin flexible films and sheets (max thickness ≤1mm). It follows the standardized staircase testing principle, utilizing electromagnetically controlled free-falling dart to strike flat clamped specimens, then automatically calculating the critical impact mass (F50 value) that causes half of test samples to rupture. The acquired impact energy index acts as core QC indicator for packaging material formulation screening, batch incoming inspection and finished product compliance verification.
This tester fully aligns with ASTM D1709 A/B dual test protocols, ISO 7765-1 and GB/T 9639 national standards, integrating pneumatic clamping, touch intelligent control and built-in thermal printing modules. It is widely deployed in food packaging factories, pharmaceutical film manufacturers, composite material R&D labs and third-party packaging certification institutions.
Core Product Strengths
- Dual Standard Test Modes Fully Compatible
Supports both Method A and Method B without frame replacement:
- A standard: Fixed 660mm drop height, 38mm hemispherical dart, weight range 50–2000g for lightweight PE cling films
- B standard: Extended 1500mm lifting column, 50mm large-radius dart, 300–2000g weight range for heavy-duty co-extruded and aluminized films
Interchangeable dart heads and graded weight sets cover nearly all flexible packaging material testing demands.
- Electromagnetic Dart Release Eliminates Human Error
High-stability electromagnetic chuck locks the dart accurately at preset heights, releasing instantly with one-touch trigger. Unlike manual hook release structures, this design avoids inconsistent falling velocity caused by hand shaking, delivering highly repeatable parallel test data and eliminating subjective operation deviation.
- Uniform Pneumatic Sample Clamping System
Imported pneumatic valve assembly delivers balanced holding force around the entire specimen ring, ensuring flat tension-free fixation of 150mm+ square film samples. No local over-tightening or wrinkling occurs during clamping, preventing premature fracture that distorts final F50 calculation results. Built-in observation lamp illuminates the impact zone for clear post-strike damage inspection.
- 7-Inch Touch Intelligent Data Processing
Color capacitive touch terminal integrates all parameter setting functions: drop height, initial dart mass, weight increment and test cycles. The embedded microchip automatically records rupture/intact status of each specimen, computes F50 critical weight and corresponding impact energy after completing staircase testing. Internal thermal printer outputs full test reports directly without extra PC connection.
- Stable Rigid Frame & Level Calibration Design
Thickened aluminum vertical lifting column paired with heavy anti-slip base plate; built-in horizontal bubble gauge allows quick leveling adjustment before testing to prevent tilt-induced dart offset. All moving components adopt wear-resistant linear slide rails to maintain consistent drop height precision after years of continuous batch testing.
- Complete Safety Protection Layout
Dart falling path adopts enclosed structural design to prevent flying broken film fragments; independent emergency stop button instantly cuts electromagnetic power to halt operation. Dual trigger mode (touch screen + external test button) avoids accidental dart release during sample replacement, meeting strict laboratory safety operation norms.
Full Technical Parameter Specification
| Parameter Item | KR-720 Standard Index |
|---|---|
| Supported Test Standards | ASTM D1709 A/B, ISO 7765-1, GB/T 9639 |
| Test Method A Dimension | H=660mm, 38mm dart, 50~2000g weight range |
| Test Method B Dimension | H=1500mm, 50mm dart, 300~2000g weight range |
| Mass Measuring Precision | ±0.1g (0.1J energy resolution) |
| Specimen Required Size | ≥150×150mm flat film sheet |
| Specimen Fixing Mode | Pneumatic circumferential clamping |
| Control Terminal | 7-inch color touch screen with built-in thermal printer |
| Standard Ambient Test Condition | 23℃, 50% relative humidity |
| Input Power | Single-phase AC220V 50Hz |
| Machine Outer Size (A version) | 500(L)×450(W)×1320(H) mm |
| Machine Outer Size (B version) | 500(L)×450(W)×2160(H) mm |
| Complete Net Weight | 70 KG |
Standard Full Test Operation Workflow
- Equipment Level Check & Parameter Setup
Adjust four base foot pads by referencing horizontal bubble, power on touch panel and select Method A/B according to film material type, input initial dart mass and incremental weight value for staircase testing.
- Film Specimen Clamping
Cut film into standard 150mm square pieces, place flat on the circular clamping fixture, activate pneumatic switch to evenly fasten the specimen without folds.
- Dart Installation & Height Calibration
Match corresponding standard hemispherical dart, assemble graded counterweights to reach target mass; lift the electromagnetic chuck to preset drop height and lock position.
- Automatic Staircase Impact Cycle
Press test trigger to launch free fall; after each strike, record if the film ruptures. The system automatically adjusts dart weight for subsequent rounds following staircase algorithm rules.
- F50 Data Calculation & Report Printing
After finishing the required number of specimen tests, the touch system auto-computes critical rupture mass and impact energy, tap print button to generate standardized test record with all batch data.
- Post-Test Clearing & Shutdown
Release pneumatic clamp to remove damaged film scraps, retract the electromagnetic chuck to standby position, cut air supply and main power for daily storage.
Wide Industrial Application Scenarios
Food & Flexible Packaging Manufacturers
PE fresh-keeping film, multi-layer co-extrusion packaging bags, aluminized vacuum film, paper-plastic composite wrapping materials; evaluate anti-drop damage performance during transportation and storage.
Pharmaceutical Packaging Labs
Medical blister films, sterile composite barrier sheets, drug sealing membranes; carry standard compliance testing for medical packaging access certification.
New Material R&D Institutes
Biodegradable PLA/PBAT films, filled modified thin sheets, anti-crack functional packaging materials; compare toughness of different additive formulas.
Plastic Film Extrusion Factories
Blown film raw material batch quality control, finished winding film factory inspection; optimize extrusion process parameters based on dart impact test results.
University & Third-Party Testing Centers
Polymer thin material teaching experiments, cross-industry packaging product third-party performance testing, issue official standardized inspection reports.
Standard Factory Delivery Kit
- KR-720 main falling dart impact tester host (A version as standard, B height column optional upgrade)
- Complete A/B set hemispherical dart heads and full graded weight assembly
- Pneumatic clamping fixture and air pressure regulating valve assembly
- 7-inch touch intelligent control panel + embedded thermal printer
- Horizontal calibration bubble and emergency safety stop assembly
- Specimen cutting auxiliary ruler and cleaning brush set
- Multilingual operation manual matching international packaging test standards
- Factory precision calibration inspection qualification certificate
Global Distributor & After-Sales Support
We provide one-on-one remote operation demonstration and staircase testing parameter guidance, with long-term stable supply of spare dart heads, counterweights and printer paper rolls. Custom ultra-high energy upgraded configurations and overseas 60Hz voltage conversion versions are available for bulk purchase orders. Exclusive regional agent policies include priority production scheduling, OEM private brand customization and full HD product marketing image packages.
English Image Overlay Text
Main Banner Title: KR-720 Automatic Free Falling Dart Impact Tester ASTM ISO Compliant
Control Panel Tags: TEST METHOD / MASS SET / START TEST / PRINT REPORT / EMERGENCY STOP
Feature Overlay Tags: A/B Dual Modes / Electromagnetic Dart Release / Pneumatic Specimen Clamp / Built-In Thermal Printer / High Repeatability
Safety Operation Tip: Keep Hands Clear Of Dart Falling Path During Testing
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