Production of a pharmaceutical container from the melt
View Patent ↗The invention proposes a process for the production of a container for pharmaceutical and medical applications made from glass, preferably from a borosilicate glass, wherein the container is produced by a press-blow process where the container is initially preformed in a pressing step, by making a ram press a dispensed glass drop into a mold that is open at its bottom, and where the parison so produced is given its final form by a subsequent blowing step.
1. The process of producing a container from glass, the container having a shape of a hollow body open on both ends, the process comprising the steps of:
providing a mold having an open top and an open bottom;
providing a ram;
melting a glass;
dispensing a molten glass drop into said mold;
striking said ram down into said mold for pressing said glass drop, thereby preforming a parison;
heating said parison in a medium portion thereof to a temperature at which viscosity of said glass is less than 10 4.7 dPas; and
blowing said parison while rotating said parison for near-net shaping a container form of said parison;
wherein said striking and pressing step comprises in a first pressing step preforming the parison using a first ram without a cone channel;
removing said first ram;
and in a second pressing step pressing a second ram into said parison for shaping a cone channel in said parison.
2. The process of claim 1 , wherein said container is produced with a cylindrical medium portion with a flange at its one end and a cone on its other end; and
wherein said second ram is moved toward said flange from a side opposite thereof.
3. The process of claim 2 , wherein the container is produced with a full-length cone channel in its cone.
4. The process of claim 2 , wherein the parison has a wall thickness that tapers from the cone toward the flange in the cylindrical portion of the container.
5. The process of claim 1 , wherein the parison is given substantially the form of a hollow truncated cone in the pressing step.
6. The process of claim 1 , wherein the parison is cooled on at least one of its two ends after the down stroke of the first ram to a temperature at which viscosity of the glass is less than 10 10 dPas.
7. The process of claim 1 , wherein the glass drop is dispensed directly into said mold and is then pressed into said mold by said first ram.
8. The process of claim 1 , wherein the cone is cut off at an outer end thereof in order to open up the cone channel.
9. The process of claim 1 , wherein the parison is cooled on at least one of its two ends after the down stroke of the second ram to a temperature at which viscosity of the glass is less than 10 10 dPas.
10. The process of claim 1 , wherein a vacuum is applied during said first pressing step.
11. The process of claim 1 , wherein a vacuum is applied during said second pressing step.
12. A process of producing a container from glass, the container having a shape of a hollow body open on both ends, the process comprising the steps of:
providing a mold having an open top and an open bottom;
providing a ram;
melting a glass;
dispensing a molten glass drop into said mold;
striking said ram down into said mold for pressing said glass drop, thereby preforming a parison;
heating said parison in a medium portion thereof to a temperature at which viscosity of said glass is less than 10 4.7 dPas; and
blowing said parison while rotating said parison for near-net shaping a container form of said parison;
wherein the container is produced with a cylindrical medium portion with a flange at its one end and a cone on its other end; and
a parison is formed in a first pressing step, using a ram that is conical over its full length; said ram is replaced in a subsequent step by a mandrel having the shape of a cone channel; said parison is driven to rotate; and
molding rolls are pressed from the outside against said parison in a region of the cone for shaping said parison.
13. The process of claim 12 , wherein said parison is reheated in a region of the cone before said molding rolls are applied against said parison.
14. The process of claim 12 , wherein a vacuum is applied during said pressing step.
15. A process of producing a container from glass, the container having a shape of a hollow body open on both ends, the process comprising the steps of:
providing a mold having an open top and an open bottom;
providing a ram;
melting a glass;
dispensing a molten glass drop into said mold;
striking said ram down into said mold for pressing said glass drop, thereby preforming a parison;
heating said parison in a medium portion thereof to a temperature at which viscosity of said glass is less than 10 4.7 dPas; and
blowing said parison while rotating said parison for near-net shaping a container form of said parison;
wherein the container is produced with a cylindrical medium portion with a flange at its one end and a cone on its other end; and
wherein said cone channel is produced by a stroke of a mandrel guided in said ram, after the glass volume supplied has been shaped in the pressing step.