Product Overview

The KR‑404B pendulum‑style Elmendorf tear‑strength analyser quantifies propagation‑tear resistance for sheet‑form materials. Following the standard Elmendorf test principle, multi‑layer specimens with a predefined short pre‑cut slit are secured in clamps. A weighted pendulum, released from fixed starting angle, delivers stored potential energy to extend the existing slit. The consumed energy is captured digitally to calculate material tear‑strength values.

This digital‑readout laboratory instrument complies with GB/T 455, QB/T 1050, GB/T 16578.2, ISO 1974 and TAPPI‑T414 standards. It covers a broad material portfolio: various paper grades, lightweight paper‑board, technical fibre sheets, optical and composite films, non‑woven textiles and thin leather‑like substrates. Widely deployed within pulp‑paper mills, film‑processing workshops, packaging‑R&D centres and accredited third‑party QC laboratories for incoming‑material screening and finished‑product mechanical‑property evaluation.

Core Product Competitive Advantages

1. High‑Precision Pendulum Kinematic Assembly with Strict Dimensional Tolerances Precision‑manufactured tear‑arm maintains 104 ± 1 mm effective length; fixed initial swing angle set at 27.5 ± 0.5°, paired with 20 ± 0.5 mm standard specimen pre‑cut length. Low‑friction pivot bearings minimise energy loss during pendulum swing, laying the foundation for consistent and credible test outputs.
2. Wide Measuring Range for Versatile Material Compatibility Measuring interval spans 100 mN up to 13000 mN. Operators adjust the number of stacked specimen layers according to material toughness. This flexible setup works for fragile thin paper as well as tough composite films and technical fibre products without frequent pendulum‑weight replacement.
3. Excellent Display Accuracy & Repeatable Test Performance Digital read‑out unit keeps indication error within ±1 % and repeatability error ≤1 %. Digital signal acquisition eliminates visual‑parallax defects common in analogue pointer‑type testers, reducing human‑reading deviation during high‑volume batch‑sample testing.
4. Straightforward Specimen‑Handling & Compact Desktop Footprint Clear specimen‑clamping structure enables fast sample loading and pre‑cut positioning. No complex auxiliary fixtures are required. The integrated compact cabinet occupies minimal bench‑top real‑estate, fitting well inside regular paper‑testing labs and production‑site QC rooms.
5. Stable Mechanical Structure Demanding Minimal Maintenance Rigid main‑body construction resists minor external vibration interference. Key moving parts adopt anti‑wear finishing. Operators only need routine surface cleaning and periodic pendulum‑system check‑up to sustain long‑term measuring stability.

Complete Technical Parameter Table

Working‑Environment Requirements: Keep surroundings clean and dry; stay away from intense magnetic‑field sources, heavy‑vibration equipment and corrosive vapours. Compliance Standards: GB/T 455, QB/T 1050, GB/T 16578.2, ISO 1974, TAPPI‑T414

Standard Complete Test Operating Workflow

1. Pre‑Test Preparation Position instrument on a flat, vibration‑isolated lab bench. Complete power‑on self‑check. Cut specimens to standard dimensions and pre‑cut 20 mm slit. Condition samples under specified temperature‑humidity environment. Determine proper stacked‑layer quantity based on expected tear‑strength of target material.
2. Specimen Mounting Stack required number of test pieces, insert and firmly lock multi‑layer sample into upper‑and‑lower clamping jaws. Ensure pre‑cut slit aligns with standard test geometry, avoid specimen distortion or slippage.
3. Pendulum Setup Lift pendulum and lock it at the defined 27.5° initial standby‑angle. Double‑check no object obstructs pendulum swing trajectory.
4. Execute Tear‑Strength Measurement Release pendulum. It swings freely, applying stored kinetic energy to extend the pre‑cut slit through specimen layers. Once tearing action finishes, pendulum comes to rest. Instrument captures energy‑consumption data and outputs tear‑strength reading on digital display.
5. Multi‑Sample Batch Testing & Data Recording Unclamp and remove torn‑specimen. Repeat test runs for parallel samples. Record individual readings and compute average tear‑strength value for quality‑assessment purpose.
6. Post‑Test Tidying Clean clamping jaws of paper or film debris. Reset pendulum to resting position. Shut‑off main power after completing test batches. Perform periodic pendulum‑system inspection and calibration.

Wide Industrial Application Scenarios

Pulp‑Paper Manufacturing Plants

Tear‑resistance QC for base‑paper, printing‑paper and bobbin‑wrapping paper; assess fibre‑interlinking toughness for production‑process optimisation.

New‑Material & Film‑Processing Enterprises

Tear‑performance evaluation for optical films, composite membranes, insulating diaphragms and other flexible polymer sheet‑materials.

Fibre‑Material R&D Departments

Mechanical‑property testing for glass‑fibre, carbon‑fibre sheets and non‑woven fabrics, support new‑material formulation comparison.

Leather & Textile Factories

Tear‑strength inspection for thin leather‑substrates and textile‑fabric sheet‑form samples.

University Paper‑&‑Packaging‑Science Laboratories

Teaching‑experiment hardware for researching tear‑failure characteristics of fibre‑based and polymer sheet‑materials.

Third‑Party Accredited‑Testing‑Organizations

Conduct multi‑standard‑compliant tear‑strength assessment and issue formal inspection‑documents for product‑certification audits.

Standard Factory‑Full‑Delivery Kit

1. KR‑404B Elmendorf‑type digital tear‑strength‑tester main‑unit
2. Standard specimen‑cutting auxiliary tool set
3. Power‑supply connecting‑cable with protective‑ground wire
4. Multilingual printed‑operation‑manual complying with GB/T 455, QB/T 1050, GB/T 16578.2, ISO 1974, TAPPI‑T414
5. Factory‑issued performance‑inspection‑certificate

Global Distributor & After‑Sales‑Support

We provide remote‑one‑on‑one operational guidance covering specimen‑stack configuration, pendulum‑operation steps and periodic calibration notes. Spare‑parts stock includes clamping‑jaw consumables and pivot‑bearing components. Bulk‑order customers can request custom‑voltage variants for overseas‑market deployment. Regional‑exclusive‑agent privileges contain priority‑production‑scheduling, OEM private‑branding‑services and complete‑set high‑definition product‑marketing‑image‑resources.

Product‑Banner‑Marketing‑Slogan

KR‑404B Digital Elmendorf‑Type Tear‑Strength Tester | Multi‑Standard Pendulum‑Tear Analyser For Paper‑Film‑Fibre‑Non‑Woven‑Leather‑Sheet‑Materials

Core‑Feature‑Labels‑For‑Product‑Images

100‑13000 mN Broad Measuring‑Range | Low‑Friction Pendulum Kinematics | ±1 % High‑Indication‑Accuracy | Adjustable Specimen‑Stack‑Layers | Digital Read‑Out Without Parallax‑Error | Compact Desktop‑Layout | Multi‑Material‑Compatibility | GB‑ISO‑TAPPI‑Compliant

Safety‑Operation‑Reminder

Keep hands clear of pendulum swing path during test cycles. Ensure reliable equipment grounding. Avoid strong vibration or magnetic‑field interference at installation site. Conduct regular pendulum‑performance calibration for trustworthy measuring‑data.