Product Overview

The KR‑510 leather low‑temperature flex tester is integrated environmental‑chamber‑type test apparatus for evaluating cold‑resistant flex‑brittleness of leather, synthetic‑leather, rubber, shoe‑sole compounds and finished footwear. Following ASTM D1790, ASTM D1593 and JIS K6545 specifications, specimens are secured inside the insulated refrigerated cabinet and subjected to continuous cyclic bending under stable sub‑zero temperature. After completing predefined flex cycles, operators inspect test‑pieces for crack initiation, surface fracture and coating delamination to assess material suitability for use in frigid‑climate environments.

Adopting vertical‑access cabinet layout, sample‑loading and fixture‑swap operations can be completed without stooping. Multiple interchangeable internal fixtures support leather‑sheet flex, shoe‑sole bending and complete‑finished‑shoe testing scenarios. This floor‑standing unit finds wide application in tanneries, footwear factories, luggage‑goods manufacturers, material‑research labs and accredited third‑party inspection institutes for cold‑resistance batch‑validation and new‑material formulation screening.

Core Product Competitive Advantages

1. Precision closed‑loop refrigeration & PID temperature regulation Equipped with imported fully‑enclosed single‑stage compression refrigeration system. Temperature ranges from ambient down to ‑30 ℃. PID+SSR micro‑processor control delivers ±0.1 ℃ setting accuracy, chamber temperature uniformity ≤±2‑3 ℃. It takes roughly 80 min to cool chamber from room‑temperature down to ‑25~‑30 ℃, maintaining stable thermal conditions for long‑duration cyclic flex‑fatigue testing.
2. Versatile modular interchangeable internal fixture system The inner test cavity is reserved for quick fixture replacement. Users can fit dedicated assemblies for leather‑specimen flexing, shoe‑sole repeated bending or full finished‑shoe cyclic test without modifying main cabinet hardware, covering diverse footwear‑material cold‑resistance assessment workflows.
3. Robust anti‑corrosion chamber construction Inner‑chamber adopts SUS304 stainless‑steel plate to resist moisture‑condensation corrosion. Outer shell uses phosphating electrostatic spray‑coated carbon‑steel plate. High‑density rigid‑polyurethane combined with ultra‑fine glass‑fibre cotton forms multi‑layer thermal‑insulation structure to minimise cold‑loss and cut energy consumption. Large multi‑layer hollow tempered‑glass observation window with built‑in interior lamp enables visual monitoring of specimen status without opening cabinet door.
4. Multi‑layer comprehensive safety‑protection circuit Built‑in hardware interlock safeguards against electric‑leakage, short‑circuit, over‑temperature, compressor over‑pressure, motor‑overload and over‑current risk. Compressor start‑delay function protects refrigeration components and extends whole‑machine service life.
5. Flexible programmable timing & human‑machine operation Time setting ranges 0.1 s‑999.9 h with multi‑unit selectable (S/M/H). Touch‑panel controller clearly displays real‑time chamber‑temperature, set‑points and remaining test‑duration. Casters with brake pads facilitate equipment re‑positioning inside laboratory workshops. Reserved cable‑through holes support auxiliary sensor wiring.

Complete Technical Parameter Table

Compliance Standards: ASTM D1790, ASTM D1593, JIS K6545

Standard Complete Test Operating Workflow

1. Pre‑Test Preparation Position the machine on level workshop ground, lock brake‑casters. Confirm power‑supply connection and safety‑protection circuit status. Install corresponding flex‑fixture according to test‑object (leather / sole / finished shoe). Place prepared specimens onto fixture clamps and lock securely. Close cabinet door tightly. Power‑on unit, set target test‑temperature and pre‑soak dwell‑time. Start refrigeration and wait until inner‑chamber reaches thermal equilibrium.
2. Low‑Temperature Soaking Phase Keep specimens held at target cold‑temperature for prescribed dwell‑duration so sample internal temperature fully synchronises with chamber ambient.
3. Launch Cyclic Flex‑Fatigue Test Trigger flex‑drive mechanism. Specimens undergo continuous reciprocating bending inside constant‑low‑temperature environment. System accumulates test‑time / cycle‑count automatically. Machine will auto‑halt when reaching preset termination condition.
4. Post‑Test Specimen Inspection After test completion, wait for chamber temperature to rise to safe ambient range, then open cabinet door. Dismount specimens. Carefully examine bending zones for cracks, fractures, coating chipping and interfacial delamination. Record failure condition. Multiple replicate‑specimen tests are recommended for statistically‑valid evaluation conclusion.
5. Post‑Test Tidying Clear frost and condensed‑moisture inside cavity. Remove test‑specimens, wipe fixture surfaces. Reset program parameters for next‑batch‑testing. Periodically check refrigeration‑system working status and cabinet‑door sealing‑gasket integrity.

Wide Industrial Application Scenarios

Footwear & Leather‑Goods Manufacturing Enterprises

Low‑temperature flex‑brittleness QC inspection for shoe‑upper leather, synthetic‑leather, rubber‑soles and finished cold‑climate footwear; screen raw‑material batches for winter‑use shoe and luggage‑product development.

Tanneries & Polymer‑Material R‑D Departments

Study cold‑induced brittleness behaviour of tanned‑leather and flexible polymer composites; optimise tanning formulation and rubber‑compounding parameters to improve low‑temperature durability.

Footwear‑Product‑Supervision‑Inspection Institutes

Carry‑out multi‑standard‑compliant cold‑resistance flex‑verification for leather‑and‑footwear production‑batches.

University Material‑Science‑Research Laboratories

Experimental‑teaching‑equipment for polymer‑and‑leather low‑temperature‑brittleness‑performance‑research‑subjects.

Third‑Party Accredited‑Footwear‑&‑Leather‑Testing‑Organizations

Conduct formal low‑temperature flex‑resistance assessment and generate inspection‑documents for product‑certification‑audits.

Standard Factory‑Full‑Delivery Kit

1. KR‑510 leather low‑temperature flex tester main floor‑standing host‑unit (integrated refrigerated chamber + driving‑mechanism)
2. Standard base mounting frame; observation window with built‑in interior lamp
3. Universal specimen‑clamping assembly; test‑object shelf set
4. 25 mm & 50 mm diameter cable‑through hole accessories
5. Power‑supply connecting‑cable for three‑phase power‑input
6. Multilingual printed‑operation‑manual complying with ASTM‑JIS‑relevant‑test‑specifications
7. Factory‑issued performance‑inspection‑certificate

Optional spare‑parts & custom‑options: dedicated fixtures for leather / sole / finished‑shoe testing, replacement door‑sealing‑gasket, custom‑voltage power‑supply‑adaptation for overseas‑markets, non‑standard temperature‑range customisation.

Global Distributor & After‑Sales‑Support

We provide remote‑one‑on‑one operational guidance covering fixture‑replacement, temperature‑program‑setup, specimen‑mounting and refrigeration‑system routine maintenance. Spare‑parts stock includes sealing‑gaskets, filter‑components and fixture‑accessories. Bulk‑order customers can apply for custom‑power‑supply‑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‑510 Leather Low‑Temp Flex Tester | ASTM‑D1790‑JIS‑K6545‑Compliant Leather‑Footwear‑Rubber‑Cold‑Brittleness‑QC‑Testing‑Instrument

Core‑Feature‑Labels‑For‑Product‑Images

ASTM‑D1790‑ASTM‑D1593‑JIS‑K6545‑Compliant,Leather‑Low‑Temp‑Flex‑Tester,Ambient‑To‑‑30℃‑Refrigerated‑Chamber,PID‑SSR‑Precision‑Temp‑Control,SUS304‑Inner‑Chamber,Modular‑Interchangeable‑Fixtures,Multi‑Layer‑Thermal‑Insulation,Hollow‑Glass‑Observation‑Window,Comprehensive‑Multi‑Channel‑Safety‑Protection,0.1s‑999.9h‑Programmable‑Timer,Floor‑Standing‑Brake‑Caster‑Design,Leather‑Synthetic‑Leather‑Rubber‑Finished‑Shoe‑Low‑Temperature‑Anti‑Brittleness‑Performance‑Evaluation

Safety‑Operation‑Reminder

Do not open cabinet door during deep‑cooling running‑phase to avoid frost‑bite risk and heavy‑condensation inside chamber. Compressor has mandatory start‑delay protection; do not repeatedly power‑cycle unit in short intervals. Ensure three‑phase power‑supply wiring is correct and reliable equipment‑grounding is completed before power‑on. Regularly inspect door‑gasket sealing performance. Wear protective gloves when handling cold‑chamber internal parts after low‑temperature testing.