Valve Block Segmentation for Blow Molding Reliability
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Solution Overview
Problem
Conventional stretch blow molding processes for forming and filling plastic containers face challenges in controlling wall thickness distribution, especially during the pre-blow phase, and existing devices that use fluid to form containers struggle with reliable and cost-effective valve constructions capable of handling both gases and liquids.
Innovation Solution
A valve block for a form-filling machine with separate blow gas channels and a product channel, where the blow gas channels are regulated by different valves than the product channel, allowing for reliable and cost-effective construction by avoiding the need for valves to withstand liquid media, and incorporating a piston or gravity to convey products into the nozzle channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate valves are used for blow gas channels and product channel, then reliability and cost-effectiveness of valve construction is improved, but device complexity increases
Solution Approach 1:
The valve block is segmented into separate blow gas channels and product channels with distinct valve control systems. The blow gas channels have dedicated blow valves while the product channel has separate product valve control, allowing each system to be optimized independently for its specific medium (gas or liquid) without requiring a single complex valve design to handle both.
2Adaptability or versatility
If valves are designed to withstand liquid media, then they can control both gas and liquid, but cost and complexity increase
Solution Approach 1:
The valve system is divided into separate control paths: blow gas valves that only need to handle compressed air and product valves that handle liquid product. This segmentation allows each valve type to be manufactured with appropriate materials and sealing designs optimized for its specific medium, avoiding the need to manufacture all valves with the more expensive liquid-resistant specifications.
3Reliability
If blow gas channels are arranged above the shut-off valve, then separation of gas and liquid control is improved, but device complexity increases
Solution Approach 1:
The blow gas channels are positioned in a vertical arrangement above the shut-off valve in the valve block structure. This spatial arrangement in the vertical dimension creates clear separation between the gas control path (upper channels) and liquid product control path (lower channel), preventing cross-contamination and allowing independent operation of each system.
Data Source
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AI summary
The present invention relates to valve blocks for a treatment station of a mold filling machine. The valve block (100) for a treatment station (5) of a mold filling machine comprises a nozzle channel (130), a first chamber (107) and a second chamber (112) in fluid communication with the nozzle channel (130), wherein the first chamber (107) is separated from the nozzle channel (130) by a first shut-off valve (108) and the second chamber (112) is separated from the nozzle channel (130) by a second shut-off valve (114), and a first blow gas channel (101) in fluid communication with the first chamber (107) and with a first blow gas channel valve (104); and a product channel (110) in fluid communication with the second chamber (112).An alternative valve block (100) for a treatment station of a mold filling machine comprises a nozzle channel (130), a first blow gas channel (101) in fluid communication with the nozzle channel (130) and with a first blow gas channel valve (104), a product channel (110) in fluid communication with the nozzle channel (130), wherein the product channel is separated from the nozzle channel (130) by a shut-off valve (114); wherein the first blow gas channel valve (104) is arranged above the shut-off valve (114).