DVD-R bonding process problem highlights two

There are several ways to combine the DVD injection bonding arrangement?

The warping direction of the two DVD halves is flat, convex and concave. There are nine different permutations and combinations in the two halves.

Figure 3: Nine combinations of three different warping halves

The online production line has a single head/double head/three heads, and the single head production line can only produce the combination (AA bond) of 11,12,13, and there are problems with the upper and lower stacking rings, and the redundant upper half. Stacking rings can affect the quality of printing and reduce the life of printing screens, and the use of an injection molding machine to produce single-headed DVDs will reduce the life of the stamper by half; double-headed, triple-headed, or off-line bonding ( AB Bonding) can achieve all nine combinations, and Dummy white sheet can also be treated without stacking rings. However, the two types of half sheets come from different injection molding machines. How to maintain the stability of the concave and convex parts and adjust the two half sheets The bonding parameters of the bonding machine are matched, and the cooperation between the two must be handled with care, especially in off-line production management. When selecting an online double-headed production line, there is an advantage.

Are the two halves of the DVD-R production experience the same?

The manufacturing process that the DVD halves are undergoing is as close as possible to the manufacturing process, but the use of the white film of the same injection machine for bonding is not a necessary condition. Dummy half-sheets produced with three asymmetrical or off-line production have a faster rate of fire, so the warpage of the Dummy half-plane must be different from that of the information. In addition, only half of the information needs to be sputtered on the metal layer, and the 4x DVDR's sputtered silver layer usually needs more than 100 nm to have sufficient reflectivity, regardless of “low power/long time” or “high power/short time” splashes. Heat generated by the plating will cause saddle deformation on half of the information. After sputtering, it will take some time to recover, and most of the stress will remain. These factors will definitely affect the warpage of the finished DVDR.

In addition, the drying of dyestuffs, if not separated by spacers, is likely to produce warpage, which in turn will affect the bonding yield.

(to be continued)