Product Overview

The KR‑411B manual circular sample cutter is dedicated specimen‑preparation auxiliary hardware for Cobb water‑absorption testing and grammage determination of paper and paper‑board. It precisely punches out 100 cm² standard circular specimens in a single lever‑press stroke. Highly consistent sample area eliminates measuring deviation brought by manual cutting with knives or scissors, providing qualified test‑pieces for Cobb water‑absorbency measurement, basis‑weight calculation and other physical‑property tests.

Designed in compliance with QB/T 1671 standard, this compact bench‑top punch sampler is widely deployed in pulp‑paper mills, packaging‑material factories, quality‑supervision institutions and packaging‑R&D laboratories for routine QC‑sample‑preparation work.

Core Product Competitive Advantages

1. High‑Precision Hardened Circular Cutting‑Die Assembly Hardened alloy steel cutting‑ring guarantees precise 100 cm² sampling area, area‑tolerance controlled within ±0.35 cm², dimensional accuracy reaches ±0.01 mm. It produces burr‑free, distortion‑free circular specimens and avoids abnormal test‑result fluctuation caused by irregular sample outlines.
2. Labor‑Saving Lever‑Punch Manual Operation Ergonomic long‑lever transmission‑structure. Operators finish complete circular die‑cutting with one‑hand pressing motion. Built‑in spring‑return mechanism automatically lifts cutting‑die after each punch. No power supply required, ready‑to‑use on any flat lab‑bench.
3. Broad Material‑Thickness Compatibility Supports raw‑material thickness ranging 0.1 mm to 1.2 mm, compatible with ordinary printing paper, coated‑paper, liner‑board and thin‑corrugated‑paper grades, covering most common paper‑board lab‑sampling scenarios.
4. Compact Sturdy Bench‑Top Mechanical Build Integrated heavy‑duty metal frame, net‑weight only 15 kg. Small footprint saves valuable laboratory counter‑top space. Anti‑slip base prevents shifting during high‑force punching strokes for stable long‑term batch‑sampling.
5. Excellent Compatibility With Paper‑Lab Test Workflow Specimens produced by KR‑411B can be directly used for Cobb water‑absorption tester, analytical‑balance grammage testing and other physical‑property‑analysis instruments. It forms a complete sample‑preparation solution together with other paper‑test auxiliary cutters.

Complete Technical Parameter Table

Compliance Standard: QB/T 1671

Standard Complete Test Operating Workflow

1. Pre‑Test Preparation Place the cutter on flat rigid laboratory bench. Inspect circular cutting‑ring for paper‑dust, nick or blunt‑edge damage. Lay original paper / paper‑board sheet flat on the base platform.
2. Specimen Positioning Align target sampling zone right underneath the circular cutting‑die, keep raw‑sheet fully flat without wrinkles or offset.
3. Lever‑Driven Punch‑Cutting Press down the operating lever steadily until die fully penetrates paper‑board material. Release lever; spring‑mechanism lifts cutting‑ring back to standby‑position.
4. Retrieve Qualified Circular Specimen Take‑out punched circular sample. Inspect cutting edge for burrs or incomplete cutting. Discard defective pieces and repeat punching if required. Finished samples are ready for Cobb absorption test or grammage weighing.
5. Post‑Operation Tidying Clear paper‑chip residues from die‑cavity and base‑plate. Protect sharp cutting‑ring from heavy‑impact. Store instrument in dry environment. Periodically inspect sharpness of cutting‑die and replace worn ring.

Wide Industrial Application Scenarios

Pulp‑Paper Manufacturing Plants

Produce standard circular specimens for Cobb water‑absorption and grammage incoming‑inspection of various paper and board grades.

Packaging‑Material Production Enterprises

Sample‑preparation for absorbency‑performance comparison of coated‑paper and packaging‑base‑paper.

University Paper‑Science Laboratories

Auxiliary sample‑making hardware for paper‑packaging‑major teaching‑experiments, matched with Cobb‑absorption‑testers and analytical balances.

Third‑Party Accredited‑Testing‑Organizations

Produce QB/T 1671‑compliant circular specimens for official paper‑material‑performance‑inspection‑projects.

Standard Factory‑Full‑Delivery Kit

1. KR‑411B Cobb‑absorption circular sample‑cutter main‑unit
2. Standard 100 cm² hardened circular cutting‑ring assembly
3. Multilingual printed‑operation‑manual complying with QB/T 1671
4. Factory‑issued performance‑inspection‑certificate

Optional spare‑parts: replacement circular cutting‑ring (ordered separately).

Global Distributor & After‑Sales‑Support

We provide remote‑one‑on‑one operational guidance covering lever‑punch‑operation and cutting‑ring maintenance notes. Spare‑parts stock includes replacement cutting‑rings. Bulk‑order customers can combine‑purchase with Cobb‑absorption‑testers. 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‑411B Circular Sample Cutter | QB/T1671‑Compliant 100cm² Specimen‑Prep Tool For Cobb‑Absorption & Grammage‑Testing

Core‑Feature‑Labels‑For‑Product‑Images

100cm² Standard Sampling‑Area | High‑Hardness Circular‑Cutting‑Ring | ±0.35cm² Area‑Tolerance | Labor‑Saving Lever‑Spring Punch | 0.1‑1.2mm Thickness‑Coverage | Burr‑Free Specimen Edge | Compact Desktop‑Structure | QB/T1671‑Compliant

Safety‑Operation‑Reminder

Keep fingers away from cutting‑ring zone during lever‑pressing stroke. Prevent sharp cutting‑ring from heavy‑impact collision. Clean paper‑chips after batch‑cutting work. Replace worn‑out cutting‑ring on a regular‑basis.