Method and apparatus for producing blank-molded glass bodies for

Details Method and apparatus for producing blank-molded glass bodies for Method and apparatus for producing blank-molded glass bodies for

1996-03-20

1998-02-03

Czaja, Donald E.

Glass manufacturing

Processes

Utilizing parting or lubricating layer

65 65, 65 66, 65104, 651822, 65260, 65275, 65284, C03B 1107, C03B 4004

Patent

active

057139750

ABSTRACT:
When blank-molded optical glass bodies are manufactured according to known methods based on blank-molding technology, the product exhibits rings in the glass and folds as well as an impression that precisely coincides with the contact surface of the parison inside the pressing die before the pressing operation. These defects are not permissible in blank-molded lenses, however, because they cause an undesirable optical effect such as changing the glare value in automobile headlights. Such defects are process-dependent and are caused by the fact that the transfer of the parison to the pressing die and the pressing itself are two separate operations that are performed with different tools. According to the invention, the formation of folds and rings in the glass as well as an impression of the contact surface of the parison are prevented by the fact that the removal and the transfer of the parison to the pressing die and the pressing cycle are performed without interruption with one and the same tool (multi-purpose tool). In a further development of the invention, the pressing operation is performed in two steps to take into account the given thermal inhomogeneities in the formed bodies.

REFERENCES:
patent: 3531272 (1970-09-01), Menear
patent: 3811857 (1974-05-01), Deeg et al.
patent: 3814296 (1974-06-01), Schaich
patent: 3922156 (1975-11-01), Martin
patent: 3930819 (1976-01-01), Martin
patent: 3961927 (1976-06-01), Alderson et al.
patent: 4012215 (1977-03-01), Schwab et al.

Affiliated with

Also associated with

Rating

Method and apparatus for producing blank-molded glass bodies for does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for producing blank-molded glass bodies for, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for producing blank-molded glass bodies for will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-658643