Product Overview

The KR‑429 dirt speck tester is dedicated visual‑inspection laboratory equipment for evaluating dust‑speck impurity content on paper and paperboard surfaces. Under standard‑angle fluorescent illumination, operators identify, count and size‑grade visible foreign‑matter specks on sheet specimens by comparing against standard reference speck charts. The final test outcome is expressed as speck count per square‑meter or total equivalent speck area per square‑meter of paper surface.

This desktop unit is fully built to satisfy GB/T 1541‑1989 testing specification for dirt‑speck measurement of paper and board. It is widely deployed in pulp‑and‑paper mills, printing houses, packaging manufacturers, publication‑paper producers and accredited third‑party material‑quality‑verification laboratories for incoming‑material inspection and finished‑paper appearance‑quality grading.

Core Product Competitive Advantages

1. Standard‑Compliant Fixed‑Angle Illumination Module Equipped with a 20 W standard fluorescent light source set at 60‑degree irradiation angle. It creates uniform, stable lighting conditions that eliminate irregular shadow interference, keeping visual‑judgement conditions fully aligned with national‑standard requirements for repeatable manual‑inspection results.
2. 360° Freely‑Rotating Large‑Size Specimen Platform 270 × 270 mm rotary working table allows users to spin the paper sample for multi‑angle observation. Operators can detect specks hidden in blind viewing zones without re‑clamping the specimen, improving inspection completeness and working efficiency.
3. Supporting Standard Speck‑Size Comparison Chart Comes with reference comparison templates covering speck sizes ranging 0.05 mm² up to 5.0 mm². Technicians can quickly classify and record impurity dimensions without extra measuring tools, simplifying on‑site batch‑sample assessment workflows.
4. Compact Light‑Weight Bench‑Top Cabinet Layout Integrated compact cabinet design occupies minimal lab counter‑top area. Total net weight is only 12.5 kg, easy for relocation between different workstations. Power‑switch control is straightforward, requiring almost no operator training for routine inspection work.

Complete Technical Parameter Table

Standard Complete Test Operating Workflow

1. Pre‑Test Preparation Position the tester on flat stable lab bench. Switch on fluorescent lamp and allow short warm‑up period. Cut paper / board samples into standard test pieces according to sampling rules. Prepare standard speck‑comparison chart for reference.
2. Specimen Mounting Lay test sample flat on rotary platform, secure the sheet to avoid shifting during rotation. For double‑sided usable paper, both surfaces shall be inspected sequentially.
3. Multi‑Angle Visual Inspection Observe specimen under standard illumination with recommended viewing distance 250‑300 mm. Rotate the 360° platform step‑by‑step to fully scan the whole sample area. Compare each dirt speck against reference chart to record speck quantity and corresponding size grade.
4. Result Calculation Count specks of each size category, convert raw counts into dirt‑speck index per square‑meter according to standard‑formula requirements. Complete record‑keeping for batch‑sample QC reports.
5. Post‑Test Tidying Remove measured paper specimen. Power‑off the fluorescent light source. Keep platform surface clean of paper dust and fibre debris.

Wide Industrial Application Scenarios

Pulp‑Paper Manufacturing Plants

Appearance‑quality inspection for cultural printing‑paper, tissue paper, packaging base‑paper and cardboard; dirt‑speck grading for finished‑goods release‑testing.

Printing & Publication Enterprises

Raw‑paper incoming‑check for books, magazines and printed‑matter substrates; avoid printing‑defects caused by paper‑surface impurities.

Packaging‑Material Factories

Surface‑defect assessment for carton‑board and decorative‑packaging paper.

Paper‑Material R&D Laboratories

Evaluate pulp‑cleaning process effectiveness for new‑formula paper grades.

Third‑Party Accredited‑Testing‑Organizations

Carry‑out GB/T 1541‑compliant dirt‑speck inspection and generate formal test‑records for product‑certification audits.

Standard Factory‑Full‑Delivery Kit

1. KR‑429 paper‑board dirt‑speck tester main‑unit
2. Standard speck‑size comparison reference chart (0.05‑5.0 mm²)
3. Power‑supply cable
4. Multilingual printed‑operation‑manual complying with GB/T 1541‑1989
5. Factory‑issued performance‑inspection‑certificate

Global Distributor & After‑Sales‑Support

We provide remote‑operational guidance covering specimen‑placing, visual‑inspection procedures and routine lamp‑replacement notes. Spare‑parts stock includes 20 W replacement fluorescent lamp tubes. Bulk‑order customers may request custom‑voltage variants for overseas markets. 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‑429 Paper‑Board Dirt‑Speck Tester | Standard Visual‑Inspection Instrument For Paper‑Surface Impurity‑Speck Counting & Grading, Complies GB/T1541‑1989

Core‑Feature‑Labels‑For‑Product‑Images

60° Standard‑Angle Fluorescent Illumination | 360° Rotating 270×270 mm Platform | 0.05‑5.0 mm² Speck Reference Chart | Light‑Weight Compact Desktop Unit | GB/T1541‑1989 Compliant | Easy‑Operation Visual‑Quality‑Check

Safety‑Operation‑Reminder

Avoid long‑time direct‑gaze toward the fluorescent light source. Replace aged lamp tubes timely to guarantee illumination quality. Keep rotary platform free of paper scraps to ensure smooth rotation.