Method and device for hot-shaping glass containers
A method for molding end portions on glass containers that store pharmaceutical active ingredients is provided. The glass containers are produced from a glass tube by hot-forming, an end portion having a neck opening using a centrally disposed opening forming tool interacting with a shaping tool at one end of the glass containers. In the method, dimensional data is provided for the respective glass tube and the position of the shaping tool is adjusted in a motorized manner in the axial direction (z) of the glass containers so as to correspond to the provided dimensional data for the respective glass tube.
1. A method for forming glass containers with an opening at an end portion from a glass tube, comprising:
determining dimensional data of a specific glass tube with a non-tactile inspection system;
storing the determined dimensional data of the specific glass tube as tube-specific data in a database or a datasheet;
controlling a position of an exteriorly disposed shaping tool in an axial direction of the glass tube based on an adjustment calculated from the determined dimensional data of the specific glass tube using the tube-specific data read from the database or datasheet; and
interacting a centrally disposed opening forming tool and the exteriorly disposed shaping tool with an end of the specific glass tube to form the end portion with the opening.
2. The method of claim 1 , wherein the step of controlling the position is carried out prior to the step of interacting, and wherein the step of interacting further comprises keeping the position in the axial direction constant during the interacting.
3. The method of claim 1 , further comprising controlling a position of the forming tool in the axial direction of the glass tube based on the determined dimensional data and independent of the shaping tool.
4. The method of claim 1 , wherein the shaping tool comprises a plurality of shaping tools and wherein the step controlling the position comprises conjointly controlling the position of the plurality of shaping tools.
5. The method of claim 4 , further comprising, prior to the step of interacting, controlling a position of the forming tool in the axial direction of the glass tube based on the determined dimensional data.
6. The method of claim 1 , further comprising adjusting a position of a heater in the axial direction based on the dimensional data.
7. The method of claim 1 , wherein the determined dimensional data is selected from a group consisting of a wall thickness of the end of the glass tube, an external diameter the end of the glass tube, an internal diameter of the end of the glass tube, and any combinations thereof.
8. The method of claim 1 , further comprising processing the determined dimensional data by an open-loop or closed-loop control installation to output a control variable, wherein the step of controlling the position comprises inputting the control variable into an actuator that adjusts the position of the shaping tool based on the control variable.
9. The method of claim 8 , wherein the step of processing the determined dimensional data comprises comparing the determined dimensional data of the specific glass tube with nominal values for the specific glass tube.
10. The method of claim 1 , further comprising holding the shaping tool in a constant plane that is perpendicular to the axial direction.
11. The method of claim 1 , wherein the interacting step comprises introducing the forming tool into a neck opening of the end portion in the axial direction.
12. The method of claim 11 , wherein the interacting step further comprises moving the shaping tool, in the form of rotatably movable shaping rolls, into contact with an outside of the neck opening.
13. The method of claim 11 , wherein the interacting step further comprises contacting a plate of the forming tool with a mouth of the neck opening.
14. The method of claim 1 , further comprising:
holding a plurality of glass tubes in holding chucks that are distributed circumferentially around a rotary table by a portion other than the end portion;
defining a plurality of processing stations around the rotary table; and
rotating the rotary table so that the holding chucks present the end portions to a respective one of the plurality of processing stations, wherein the shaping tool is disposed at one of the processing stations,
wherein the step of controlling the position has a temporal period that is shorter than a temporal period for the step of rotating the rotary table.
15. The method of claim 1 , further comprising filling the glass container with a pharmaceutical active ingredient through the opening.
16. The method of claim 1 , wherein the controlling of the position of the exteriorly disposed shaping tool in the axial direction of the glass tube is by at most 0.15 mm.