Product Overview

The KR‑430 microcomputer‑driven bending stiffness analyser quantifies flexural rigidity for paper, cardboard and other sheet‑shaped non‑metallic substrates. It measures the bending moment required to deflect a clamped specimen to preset angles, delivering objective stiffness‑value outputs.

Equipped with a colour graphic LCD terminal and fully‑motorised deflection mechanism, this bench‑top device eliminates manual operation‑induced deviations. It supports regular stiffness assessment as well as crease‑stiffness evaluation for pre‑creased board samples. Widely adopted by paper mills, carton‑packaging manufacturers, printing houses, packaging R&D labs and accredited third‑party material‑verification institutes for incoming‑batch QC, finished‑goods inspection and new‑material performance comparison.

Core Product Competitive Advantages

1. Fully‑Motorised Angle‑Driving Mechanism Motor‑controlled deflection motion supports arbitrary angle configuration within 1°‑90°, with default preset positions of ±7.5° and ±15°. Test dwell time can be freely programmed from 3 s up to 30 s. Stable drive motion greatly cuts human‑operation errors and improves test repeatability for batch‑sample work.
2. Six‑Selectable Bending‑Length Configurations Quick‑switch fixture setup supports six standard bending lengths: 50 mm, 25 mm, 20 mm, 15 mm, 10 mm, 5 mm (tolerance ±0.1 mm). It adapts to thin lightweight paper through thick heavy‑weight cardboard without hardware modification.
3. Automatic Zero‑Calibration & Rich On‑Board Data Functions Built‑in auto‑zero routine removes baseline offset before each measurement; no manual pre‑adjustment is needed. The unit captures real‑time stiffness‑vs‑time curves on‑screen, automatically calculates max/min/average statistics, stores test records and generates hard‑copy reports via integrated thermal printer.
4. High‑Precision Sensing & Compact Cabinet Layout High‑resolution force‑sensor delivers 0.1 mN readout resolution with indication variability kept ≤1 %. Single‑chip microcontroller handles the whole workflow including parameter management, signal acquisition and arithmetic computation. The compact table‑top cabinet saves laboratory counter‑top footprint and requires minimal operator training.
5. Expandable For Crease‑Stiffness Testing When paired with an optional dedicated sample cutter, the instrument can perform crease‑stiffness tests for folded cardboard specimens, expanding application coverage for packaging‑material research projects.

Complete Technical Parameter Table

Optional Auxiliary Hardware: cardboard stiffness sample cutter. Sampling dimensions: standard stiffness specimen 70 × 38 ± 0.1 mm; crease‑stiffness specimen 38 × 36 mm (max sample thickness below 1 mm).

Standard Complete Test Operating Workflow

1. Pre‑Test Preparation Place tester on stable level lab bench. Power‑on equipment, let system complete self‑check and auto‑zero calibration. Select target bending‑length, deflection‑angle and dwell‑time parameters on the graphic‑display interface. Cut paper / cardboard specimens to required dimensions, or use optional cutter to prepare creased test‑pieces.
2. Specimen Clamping Secure cut sample firmly inside the specimen‑holding fixture, ensure proper alignment matching selected bending‑length setting.
3. Automatic Bending‑Stiffness Measurement Trigger test‑start command. Motor‑driven load‑arm bends the specimen to preset angle and maintains configured dwell duration. The sensor continuously collects bending‑moment data.
4. Data Review & Report Output After measurement finishes, stiffness result is shown on‑screen. Conduct multi‑point sampling for one batch; view statistical computed values. Print inspection report via built‑in thermal printer as required.
5. Post‑Test Tidying Release the fixture and remove measured specimen. Clear paper dust from clamping station. Shut‑down instrument once all sample batches are completed.

Wide Industrial Application Scenarios

Pulp‑Paper & Cardboard Manufacturing Plants

Flexural‑rigidity quality‑control for base‑paper, coated paper and finished cardboard; incoming‑raw‑material acceptance inspection and finished‑product performance grading.

Printing & Packaging Material Enterprises

Stiffness‑property assessment for carton blanks, packaging board and pre‑creased folding‑box stock; evaluate folding‑process suitability for packaging‑design optimisation.

Paper‑Material R&D Departments

Performance comparison for newly‑developed paper‑board formulations; support lightweight‑packaging‑material development work.

University & Packaging‑Technology Research Institutes

Teaching‑experiment apparatus for paper‑packaging‑majors; mechanical‑characteristic research for fibre‑based sheet‑materials.

Third‑Party Accredited‑Testing‑Organizations

Conduct standard‑compliant bending‑stiffness and crease‑stiffness evaluation and issue formal inspection‑documents for product‑certification and factory‑acceptance audits.

Standard Factory‑Full‑Delivery Kit

1. KR‑430 paper‑cardboard bending‑stiffness‑tester main‑unit
2. Standard multi‑position bending‑length fixture assembly
3. Built‑in thermal printer with initial roll of printing paper
4. Multilingual printed‑operation‑manual
5. Factory‑issued performance‑inspection‑certificate

Optional accessory: dedicated cardboard stiffness sample cutter.

Global Distributor & After‑Sales‑Support

We provide remote‑one‑on‑one operational guidance covering parameter configuration, specimen clamping and routine equipment‑calibration procedures. Spare‑parts stock includes force‑sensor assemblies, printer‑consumables and fixture‑replacement 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‑430 Microcomputer‑Controlled Bending‑Stiffness Tester | For Paper‑Cardboard Flexural‑Rigidity & Crease‑Stiffness Quality‑Assessment

Core‑Feature‑Labels‑For‑Product‑Images

Motor‑Driven Adjustable 1‑90° Bending‑Angle | Six‑Selectable Bending‑Length | Auto‑Zero Calibration | Real‑Time Stiffness‑Time Curve | On‑Board Thermal‑Printer | Batch‑Statistical Calculation | Expandable For Crease‑Stiffness Test | Compact Bench‑Top Layout

Safety‑Operation‑Reminder

Do not place fingers inside moving load‑arm and fixture gap during automatic‑testing cycles. Keep fixture area free of paper‑dust and fibre residues. Conduct periodic sensor‑verification to sustain measuring‑data accuracy.