Glass Receptacle Thread Ridge Forming for Precise Capping
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Solution Overview
Problem
Existing glass receptacle manufacturing methods suffer from thread ridge deformations during transfer and cooling, leading to poor capping and high rejection rates, with the neck ring being visibly exposed when capped, and precision in thread formation is inadequate in both blank and blow molds.
Innovation Solution
The method involves molding starting thread ridges in a blank mold with precise finishing thread grooves in a blow mold, ensuring the thread ridges are inserted at a register during blow-molding, maintaining dimensional stability and correcting any distortions, with the thread ridges placed below the neck ring to be hidden by the cap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thread ridges are molded in the blank mold with great dimensional precision, then the thread ridges can be formed with high precision, but during transferring and cooling the threads suffer deformations beyond acceptable tolerances leading to poor capping and high rejection rates
Solution Approach 1:
The thread ridges are preliminarily formed in the blank mold with high precision, then protected from deformation by keeping them outside the blow mold during the blowing process. The neck ring acts as a protective barrier that prevents the pre-formed thread ridges from undergoing the blow-molding process that would cause deformation.
Solution Approach 2:
The molding process is segmented into two independent stages: first forming the thread ridges and neck ring in the blank mold, then separately forming the receptacle body in the blow mold. This segmentation allows the thread ridges to be formed with high precision while avoiding exposure to the blow-molding process that would cause deformation.
2Manufacturing precision
If the neck ring is positioned between the thread ridges and the receptacle body, then the blow-molding process effect on thread ridges is reduced minimizing deformations, but the neck ring remains visible when capped producing an undesirably visual effect
Solution Approach 1:
Instead of placing the thread ridges above the neck ring (conventional approach), the invention inverts the arrangement by positioning the thread ridges below the neck ring. This inversion allows the neck ring to cover and hide the thread ridges when the cap is applied, eliminating the visible neck ring effect while maintaining thread ridge precision through reduced blow-molding exposure.
3Ease of manufacture
If thread ridges are formed solely in the blow mold, then the process is simplified, but the molten glass is cooler and air pressure inside the preform is insufficient to obtain complete insertion of the molten glass in the finishing thread grooves
Solution Approach 1:
The thread ridges are preliminarily formed in the blank mold when the glass is at high temperature and highly plastic, ensuring complete insertion into the thread grooves. This preliminary formation occurs before the glass cools down in the blow mold, eliminating the problem of insufficient insertion that would occur if thread formation were delayed until the blow-molding stage.
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
This approach results in precise, high-tolerance thread ridges that minimize deformations and visual exposure of the neck ring, reducing defects and enhancing the aesthetic appeal of the glass receptacles.
Implementation Method 1
blowing a pressurized gas through the receptacle mouth
Implementation Method 2
due to the contraction produced during the cooling process
Data Source
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AI summary
Improved glass receptacle, automated production method and manufacturing tooling thereof, the glass receptacle comprising a finished receptacle body (11) and a receptacle mouth region (30) including a receptacle mouth (31), a neck ring (32) and finished thread ridges (22) therearound; wherein the finished thread ridges (22) are placed between the neck ring (32) and the finished receptacle body (11), said receptacle being produced by a preform (1) with starting thread ridges formed in a blank mold (40) with starting thread grooves, and later transferred and finished by a blow-molding operation in a blow mold (50) with finishing thread grooves producing a finished receptacle with finished thread ridges.