Blow Nozzle Sealing in Plastic Bottle Preform Production
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Solution Overview
Problem
Conventional plastic bottle production processes, such as injection blow molding and stretch blow molding, face challenges with oversized blow nozzles that can damage the neck section, poor sealing, and high production costs due to the need for large-diameter blow nozzles and peripheral support rings.
Innovation Solution
The process involves sealing between the blow nozzle and preform within the preform, eliminating the need for oversized blow nozzles and peripheral support rings, allowing for smaller nozzle diameters and reduced material usage, with sealing occurring internally within the preform using annular or conical surfaces for enhanced stiffness and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing takes place between the blow nozzle and the support ring surface, then the preform can be sealed during blow molding, but the blow nozzle must have a very large diameter which can damage the neck section
Solution Approach 1:
The sealing function is extracted from the support ring surface and relocated to the inside surface of the preform body. This eliminates the need for the blow nozzle to contact the support ring and neck section, thereby preventing damage to the neck section while maintaining sealing reliability.
Solution Approach 2:
The inside surface of the preform body acts as an intermediary sealing surface between the blow nozzle and the support ring. This intermediary location allows sealing to occur without the blow nozzle needing to accommodate the support ring diameter, thus avoiding neck section damage.
2Reliability
If the blow nozzle diameter is increased to seal on the support ring surface, then sealing can be achieved, but production costs increase due to oversized nozzles and support rings
Solution Approach 1:
The sealing function is extracted from the support ring structure, eliminating the need for oversized support rings and blow nozzles. This reduces material usage and manufacturing costs while maintaining sealing effectiveness.
Solution Approach 2:
The preform body itself serves as the sealing surface, eliminating the need for expensive, oversized support rings and blow nozzles. This approach uses the preform's own structure for sealing, reducing overall component costs.
3Ease of operation
If the blow nozzle diameter is increased to accommodate the neck section, then the neck section can be held during blowing, but the pour opening becomes overly large
Solution Approach 1:
The support function for the neck section is extracted from the blow nozzle and transferred to the support ring. This allows the blow nozzle to have a smaller diameter that does not affect the pour opening size, while the neck section remains properly supported during the blow molding process.
4Reliability
If sealing pressure is increased to prevent medium escape, then sealing reliability improves, but wear and damage to the blow nozzle and support ring increase
Solution Approach 1:
The sealing contact is extracted from the support ring surface and relocated to the inside surface of the preform body. This eliminates the repeated high-pressure contact between the blow nozzle and support ring, reducing wear and damage while maintaining sealing reliability through the preform's own structural integrity.
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 prevents deformation of the neck section, reduces production costs, and ensures a reliable seal during the blow molding process, enabling the production of plastic bottles with larger pour openings while maintaining control over the blow nozzle adjustment and mechanical composition.
Implementation Method 1
inflated using the blow nozzle by overpressure according to the mold cavity
Implementation Method 2
The sealing of the blow nozzle on the circular ring surface of the support ring must take place with relatively large applied pressures in order to prevent escape of the inflation medium
Data Source
AI summary
Method for producing a plastic bottle, and preform and blowing mold suited therefore are disclosed. An exemplary process can produce a plastic bottle, for example, a PET bottle. Such a bottle can be produced from a preform which has a body which is closed on one side, which is connected to a neck section with a pour opening, in which the preform which has been produced in a plastic injection process or an extrusion process is placed in the mold cavity of a blow mold and inflated using the blow nozzle by overpressure according to the mold cavity. Sealing can take place between the blow nozzle and the preform within the preform.