With the development of coating technology and the requirement of optical lens is increasing, for it is particularly important to the work of cleaning the glass lenses.
Clean the dirt is mainly
Traditional cleaning method is to use gauze, air-laid paper and so on wiping materials with chemical reagents such as gasoline, ethanol, acetone, ethyl ether, adopt the soak, wipe the means of manual cleaning.
This method is completely by artificial finished, time-consuming, laborious and cleanliness poor consistency, obviously not suitable for large-scale optical cold working industry.
Gradually replace manual cleaning and ultrasonic cleaning technology, and further promote the development of the optical cold processing industry.
The main principle of ultrasonic cleaning is of high frequency ultrasound (
Usually 25 KHZ to 40 KHZ)
Vibration in the liquid medium, the vacuum cavitation bubble and is produced in the process of the merger, the demise of the huge force, clean up dirt on the surface of the object with cleaning medium.
Ultrasonic cleaning has good consistency and clean no dead Angle, high washing efficiency, etc. The cleaning fluid without hand touching, safe and reliable, at the same time to eliminate the manual cleaning have damage on the workpiece.
In addition ultrasonic cleaning use of flexible, can according to the need to select the suitable object cleaning temperature, power, frequency, cleaning time, cleaning agents, etc. , ensure the quality of the lens cleaning effectively.
IPA technique is a kind of the use of IPA steam for dehydration dry cleaning process, mainly by the wash, rinse, dehydration, drying of four processes.
Because the washing solvent cleaning and water-based cleaning process points, and some to solvent cleaning, solvent steam drying for water-based cleaning;
Also some solvent cleaning are first, then using emulsifier dissolved solvent, and then to water-based cleaning.
Obviously, the latter on the process more smooth, compact, simple also to equipment requirement.
After washing the optical lens surface will not have a combination of strong dirt, there may be only a mixture of several cleaning and loose dirt.
Using water dissolve after washing lotion and dirt on the surface of the lens, elimination of process called rinse.
Major factors that affect the rinse including lotion rinse performance, the purity of rinse water, temperature, liquidity, as well as the ultrasonic frequency and so on.
After rinsing, the optical lens cleanliness should be consistent with the rinse water cleanliness, enter the IPA, under the action of ultrasonic, IPA can be quickly complete miscibility and pure water, causing the lens surface state and miscibility of IPA, same this process is called dehydration, the influencing factors of dehydration include dehydration time, the purity of IPA (
Generally higher than 97%)
, ultrasonic frequency.
Finally enter the IPA steam drying tank, IPA under the high temperature oil heating boiling, and formed in the condensing zone concentration and temperature relatively stable zone of the steam, the steam on the surface of the glass lenses that low-temperature condensation liquefaction, like shower wash surface of the lens, until the lens surface temperature and steam temperature, the same lens in bracket driven to rise back to the cooling area, in the process of the lens to get dry.
Dry the influencing factors including the purity of IPA, condensation of the length of stroke, the chain of ascension, the drying time and so on.
Pure water process is a kind of using hot water one or cold water to dry to dry cleaning process.
Mainly by washing, rinsing, drying of three processes.
The same process of washing and rinsing with IPA.
The main difference between dry.
Drying is divided into hot water slowly lifts and cold water dry two kinds.
Resistivity is greater than 15 M Ω m. reached the maximum water surface tension under high temperature, rinse lenses immersed among them after surface wetting.
In sloping slowly pulling away, due to the great, the surface tension of the water quickly to leave in surface shrinkage into the spherical lens, lens after dehydration in filtering under the hot and dry.
As a result, the hot water slowly lift the influence factors of drying methods include the purity of water, temperature and slow pulling speed, the inclination of the workpiece, hot air cleanliness.
Another kind of cold water to dry process is relatively simple, pure water rinse after lens directly into the centrifugal dryer, by using the principle of centrifugal separation to separate pure water on the surface of the glass lenses and drying effect, which can save space and the use of IPA, suitable for low requirements for the lens.
Selection of pure water machine cleaning glass lenses to pure water water quality requirement is very high, generally resistivity should be above 15 million, lower than the resistivity likely watermark and the phenomenon of white dots, but for cleaning such as acrylic plastic lenses resistivity you just need to more than 10.
Domestic market more pure water machine technology is generally USES the RO membrane filtration and ionization of the mixed bed resin of Yin and Yang, for mobile phone lens, optical glass it is recommended to use the pure water machine, double tank of the mixed bed can rotate used interchangeably and won't delay the production, in addition to more advanced is the RO membrane + EDI filtration system, the pure water machine does not need resin ionization filtration and regeneration of Yin and Yang, pure water water quality keep stable state, from a lot of trouble and saving the cost of regeneration, but the price is a lot higher than the resin type pure water machine, in the long run, or EDI type or more cost-effective.
For the size of the glass lenses factory of pure water machine, water production generally choose half a ton, a ton or more greatly.
11 slot with a conventional ultrasonic optical glass lens cleaning machine as an example, the collocation of one and a half tons of pure water machine is more appropriate.
Position put don't too far away, so as not to affect the water quality, put by ultrasonic cleaning machine.
Optical glass cleaning is evidence for the selection of cleaning process of fouling formation on the surface of glass adopts the different process, the different reasons of avoid by all means one size fits all.
Such as cleaning white glass after glass and screen printing, to separate cleaning, adjustment and cleaning time, temperature, concentration of detergent for cleaning and replacement frequency, especially for flat grinding after simple white glass after cleaning, to use ultrasonic cleaning in time, middle residence time shoulds not be too long, had better use pure water soak for a period of time.
Some of the deinking rework glass, surface dust, oil and the water has dried up, added special potion before cleaning processing, can thoroughly clean.
For screen printing after the glass need to give special attention to when washing, screen printing ink and the LOGO can't change color, fall off or defective, become warped edge, according to the timely adjustment process such as cleaning agent of PH value, decrease the ultrasonic power and cleaning water temperature, optical glass lenses in order to achieve the best cleaning effect.