No.548-YKG Coating Applicator (Doctor Blade)
| Brand | Yasuda Precision Machinery |
|---|---|
| Origin | Japan |
| Model | No.548-YKG |
| Compliance | JIS K 5101, JIS K 5400 |
| Application | Controlled-thickness film deposition for coatings and pigments |
Overview
The No.548-YKG Coating Applicator (Doctor Blade) is a precision-engineered laboratory tool designed for the reproducible preparation of uniform thin films of liquid or paste-like materials—primarily paints, varnishes, inks, and pigment dispersions—on standardized test substrates. It operates on the principle of controlled gap deposition: a fixed-height stainless-steel blade edge maintains a precise clearance between itself and the substrate surface during manual, unidirectional draw-down motion. This mechanical gap defines the wet film thickness with high repeatability under consistent operator technique and substrate flatness. The device is not motorized; its performance relies on calibrated geometry, blade edge integrity, and adherence to standardized draw-down protocols defined in Japanese Industrial Standards JIS K 5101 (Testing methods for paints and varnishes) and JIS K 5400 (Methods for testing printing inks). Its design prioritizes dimensional stability, corrosion resistance, and tactile feedback essential for QC laboratories performing routine film thickness validation prior to drying, curing, or subsequent property evaluation (e.g., gloss, adhesion, hardness, or optical density).
Key Features
- Fixed-gap doctor blade geometry with precisely ground stainless-steel cutting edge, ensuring consistent wet film thickness across repeated applications.
- Robust aluminum alloy body with ergonomic handle and non-slip grip surface, optimized for controlled manual draw-down at constant speed and pressure.
- Calibrated gap height corresponding to standard JIS-defined film thicknesses—compatible with common test panels (e.g., glass, metal, or plastic substrates per JIS Z 3101 or JIS K 5600-1).
- Compact, portable, and maintenance-free design requiring no power supply or calibration software—ideal for benchtop use in quality control, R&D, and regulatory testing environments.
- Manufactured in Japan by Yasuda Precision Machinery, adhering to strict tolerancing and surface finish specifications critical for metrological reliability.
Sample Compatibility & Compliance
The No.548-YKG is validated for use with Newtonian and mildly shear-thinning liquid coatings, including solvent-based, water-based, and UV-curable formulations. It is not recommended for highly thixotropic pastes, filled systems with abrasive particles >10 µm, or materials exhibiting rapid edge instability (e.g., severe beading or crawling). Substrate requirements include flatness ≤2 µm deviation over 100 mm and surface energy suitable for wetting (typically ≥35 mN/m). All operational procedures comply with JIS K 5101-4 (Film application methods) and JIS K 5400-3 (Ink film preparation), supporting traceable data generation in GLP-compliant laboratories. While not an electronic instrument, its mechanical conformity enables integration into ISO/IEC 17025-accredited testing workflows where film thickness uniformity is a critical input parameter.
Software & Data Management
This is a purely mechanical, analog coating applicator with no embedded electronics, firmware, or connectivity interfaces. Film thickness is determined solely by the physical gap dimension and verified post-application using contact profilometry (e.g., stylus-based instruments per ISO 4628-2), optical interferometry, or gravimetric methods (mass per unit area). Users are responsible for documenting draw-down speed, ambient temperature/humidity (per JIS Z 8703), substrate batch ID, and operator identity in laboratory notebooks or LIMS entries to satisfy audit requirements under ISO 9001 or IATF 16949. No proprietary software or driver installation is required.
Applications
- Preparation of standardized wet films for ASTM D1210, ISO 2808, and JIS K 5600-2 viscosity and film thickness correlation studies.
- QC screening of batch-to-batch consistency in pigment dispersion stability and rheological behavior.
- Substrate compatibility testing prior to industrial coating line qualification.
- Reference film generation for spectrophotometric color measurement (ASTM E308, ISO 11664-4) and haze evaluation (ASTM D1003).
- Accelerated weathering sample preparation where uniform initial film mass is essential for valid degradation kinetics analysis.
FAQ
What wet film thickness does the No.548-YKG produce?
The nominal gap corresponds to standard JIS-defined thicknesses—common variants include 15 µm, 25 µm, 50 µm, and 100 µm wet film thicknesses. Exact value depends on the specific blade variant ordered; refer to the engraved marking on the blade holder.
Can it be used with ISO or ASTM standards?
Yes—while calibrated to JIS, its geometric principle aligns with ISO 2808 Type A (draw-down bar) and ASTM D823 (Method A), provided substrate preparation and draw-down technique follow those standards’ procedural requirements.
Is cleaning required between samples?
Yes—residual material must be removed using compatible solvents (e.g., acetone for acrylics, xylene for alkyds) followed by lint-free wipe to prevent cross-contamination and edge clogging.
Does Yasuda provide calibration certificates?
No—this is a passive mechanical tool without adjustable components; conformance is verified via dimensional inspection against JIS-specified tolerances during manufacturing. End-user verification may be performed using optical comparators or coordinate measuring machines.
What substrate sizes are compatible?
Optimal performance is achieved on rigid, flat panels ≥100 mm × 150 mm. Smaller substrates require careful alignment to ensure full blade contact and avoid edge effects.
