Glass Preform Pressing System with Adaptive Piston Stroke
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pre-form-press systems for forming glass containers often result in ridge formation between the press stamp and guide ring, leading to poor sealing and assembly issues, and quality problems due to mass fluctuations in glass drops.
Innovation Solution
A pre-form-press system with a controlled piston hub that compensates for mass fluctuations in glass drops by adapting the piston stroke, and an internal cooling device to prevent thermal expansion and ensure process stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the press ram is radially guided by a non-split guide ring with guide play or gap, then the press ram can be centered and guided, but glass mass can enter the gap causing burr formation at the mouth entrance
Solution Approach 1:
The harmful guide ring is completely removed from the system. Instead of using a guide ring that creates gaps and burrs, the invention uses the preform cavity wall itself as the guiding surface, eliminating the source of burr formation while maintaining guiding function.
Solution Approach 2:
The guiding function previously performed by the separate guide ring is merged into the preform cavity structure. The press ram is guided directly by the preform cavity wall, combining the containing and guiding functions into a single integrated structure.
2Manufacturing precision
If the end working position of the press ram is determined by glass mass resistance, then the preform cavity is completely filled, but the final position varies with glass gob mass fluctuations
Solution Approach 1:
The press ram position is predetermined by the fixed geometry of the preform cavity rather than being determined during the process by variable glass resistance. The cavity dimensions are set in advance to ensure consistent positioning regardless of glass mass variations.
Solution Approach 2:
The preform cavity acts as an intermediary structure that translates variable glass mass into consistent press ram positioning. The fixed geometric boundaries of the cavity provide a stable reference that eliminates the direct correlation between glass weight and final position.
3Device complexity
If a fixed piston stroke is used to pre-form the base, then the pressing process is simple, but mass fluctuations cause excessive glass penetration or insufficient filling
Solution Approach 1:
The piston stroke is made dynamically adjustable rather than fixed. The system can adapt the stroke length to compensate for glass mass variations, ensuring consistent preform quality while maintaining a relatively simple mechanical pressing mechanism.
Solution Approach 2:
The piston stroke parameter is made variable to compensate for glass mass fluctuations. By adjusting this single parameter, the system maintains optimal pressing conditions across different glass weights without requiring complex mechanism changes.
4Shape
If the press ram has slight conicity to guide the neck finish, then the neck area is properly formed, but glass mass enters the gap between guide ring and press ram causing sharp-edged forming seams
Solution Approach 1:
The guide ring that causes the harmful interaction between conicity and gap formation is removed. The press ram's conical shape alone is sufficient to guide the neck finish without requiring a separate guide ring, eliminating the source of sharp seams.
Solution Approach 2:
Instead of using a guide ring to constrain the conical press ram, the invention allows the conical press ram to directly shape the neck area without radial constraint, inverting the traditional guiding approach and eliminating burr formation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents ridge formation and ensures high-quality glass container production by compensating for mass fluctuations and maintaining process stability through internal cooling.
Implementation Method 1
an internal cooling device (17, 23) for cooling the pressing element (10)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A blank mould base pressing system (9) for forming a burr-free mouth entry for a glass container to be produced, which blank mould base pressing system comprises a piston (9.1) which is operated by charging with gas pressure, preferably with compressed air (18), and a pressing element (10) having a pressing-element profile (10.3), wherein the piston (9.1), when it is charged with gas pressure on one side, brings the blank mould base pressing system (9) into a pressing position in relation to a glass gob (1) which is in a blank mould (2) and is to be moulded and, on contact of the pressing-element profile (10.3) with the glass gob (1), forms a base for the glass container to be produced, wherein the blank mould base pressing system (9) has a means for controlling or regulating the stroke of the piston (9.1), wherein said stroke of the piston (9.1) serves to compensate for mass fluctuations of the glass gob (1), and a method for producing a parison (1.1) by means of the aforementioned blank mould base pressing system (9), wherein the blank mould base pressing system (9) has an internal cooling device for cooling by means of a cooling medium, and a method for producing a parison (1.1) by means of the blank mould base pressing system (9) according to the invention.