The putty scraper is designed and manufactured according to the scraping method in GB1727-89 "General Preparation Method of Paint Film". The putty scraper is suitable for uniformly preparing putty coating film and thick paint coating film on various substrates (tinplate plate, steel plate, aluminum plate) for the purpose of measuring the general properties of the coating film.
Structure and working principle
1. Structure:
The putty coating scraper is composed of a bottom plate, a pressure plate, a film frame and a scraper. There are four compression columns and butterfly nuts on the bottom plate, and the film is prepared after the pressure plate compresses the film frame.
2. Working principle
After fixing the standard membrane frame with a pressure plate on the bottom plate, use a scraper to scrape it from top to bottom to form a uniform putty film thickness under the thickness of the membrane plate. The standard diaphragm of the putty applicator has three different thicknesses (1±0.05, 0.7±0.035, 0.5±0.03) mm. According to the product standard requirements, the putty thickness can be selected and combined. Due to the different solid components in the paint, when the wet film becomes a dry film, the thickness of the dry film formed is also different, so this should be fully considered when choosing to use a standard thickness film frame.
Operation and usage
1. Surface treatment of the bottom plate:
Both the tinplate and the steel plate shall use No. 0 gauze or No. 200 water sandpaper to remove the rust and remove the tin-plated layer by reciprocating longitudinally with a board machine or manually, and then clean it with a solvent (No. 200 paint solvent oil or xylene) and wipe it clean for use. The aluminum plate is cleaned with a solvent and wiped dry before use.
2. Select the standard film frame thickness according to the product requirements, press the film frame with a pressure plate and fasten it with a wing nut.
3. Use a scraper to scrape the putty evenly from top to bottom on the bottom plate to make it a flat putty coating film.
4. After loosening the four wing nuts, remove the pressure plate and the standard film frame, and dry the putty-coated bottom plate squarely in a constant temperature and humidity place or in a blast drying box (drying conditions are specified in product standards). Constant temperature and humidity conditions: The temperature is 25±1℃ and the relative humidity is 65±5%.
Maintenance and calibration , storage
The instrument should be placed in a dry place to prevent corrosion and damage to the instrument.
If the instrument meets the storage conditions and is in normal use, if it is damaged, the "Three Guarantees" will be implemented, and it will be guaranteed for one year free of charge.
Standard Diaphragm
Because the metal scraper is scratched on the standard membrane plate for a long time, it will be worn and the thickness will change, so please check the thickness of the standard membrane frame regularly. If it exceeds the tolerance requirement, it should be replaced. It is not necessary to apply protective oil for a long time to prevent corrosion . Clean with gasoline or solvent after use.
