The squeegee blade is installed on the blade holder through the support shim. The support shim can increase the flexibility of the squeegee blade, and its thickness is 0.25 ~ 0.35mm. The installation position, angle, and extension length of the squeegee have an important influence on the printing, so they put forward certain requirements for the technicians.
1. Installation location
In gravure printing, volatile ink is used. The shorter the arc between the contact point of the doctor blade and the printing plate and the imprinting point, the smaller the change in ink viscosity, the more favorable for the transfer of ink, and the better the print quality. Generally, the distance between the contact point of the doctor blade and the printing plate and the printing point is about 1/4 of the diameter of the printing plate cylinder.
2. Installation angle
The forward installation and reverse installation respectively form the ink accumulation area. The ink accumulation area formed by the forward installation has a tendency to be pushed outward by the doctor blade, while the ink accumulation area formed by the reverse installation has the ink plate to the doctor blade. In comparison, the reverse installation scraping effect is good. When the printing pressure is constant, whether the ink transfer in the ink hole on the printing plate cylinder is good is directly determined by the viscosity, so the positive installation is mainly used in gravure printing, and the contact angle is generally 70 °.
3. Extension length
Different printing requirements have different requirements for the thickness of the doctor blade, which leads to different extension lengths during installation; the doctor blades of the same thickness also have special attention to the extension length during installation. Generally, the extension length of the doctor blade is 25 mm, and the extension length of the support pad is 12.5 mm. The squeegee blades have different extension lengths and different degrees of curvature during squeegee formation, forming hard and soft squeegees. These two states are related to the thickness and extension length of the squeegee blades. The ink scraping effect is not good during hard scraping, the abrasion of the scraper blade and plate cylinder is more serious, and the service life is shortened; the soft scraping can extend the service life and easily produce dust. Therefore, the length of the extension must be strictly controlled.
Poly L-lactide-co-glycolide PLGA
Poly(lactic-co-glycolic acid) is a copolymer which is used in a host of Food and Drug Administration approved therapeutic devices, owing to its biodegradability and biocompatibility. PLGA are currently widely used in many fields, such as bone nail; coatings; lifting thread; absorbable suture; microspheres, gel for drug delivery etc.
The CAS Registry number of Poly(L-lactic acid) PLLA is 30846-39-0. It is white powder or floccule.
What we can do are PLGA5050,PLGA7525,PLGA8515,PLGA9010,etc.
We can provide Intrinsic viscosity from 0.30-2.25 dl/g, Mw from 6000-30000.
For each batch a certificate of analysis is provided, showing the analytical data determined in our quality control laboratory. Additional analytical data can be made upon request.
When stored in the original packaging at low temperatures (2-8°C), PLGA keeps its initial properties for at least two years.
RIMLESS is the exclusive distributor, exporter and global brand licensor of REBORN. We take REBORN and RIMLESS as the core brands, biomedical materials and their applications in the medical field as the main business, and the high-end medical devices as the research and development direction.
We have exported over 50 countries and areas in the world and won a very good reputation and long-term partnership with our customers.
Medical Grade Copolymer PLGA,Biomedical Poly L-lactide-co-glycolide,Poly L-lactide-co-glycolide Polimer,Poly L-lactide-co-glycolide
Rimless Industry Co.,Ltd. , https://www.rimlessmedbeauty.com