Double Wall Composite Drum Assembly for Impact Resistance
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Solution Overview
Problem
Existing stainless-steel barrels used in the food and medical fields are fragile, difficult to clean, and prone to deformation upon impact, necessitating a more durable and easy-to-clean alternative.
Innovation Solution
A double wall composite barrel assembly comprising a stainless-steel inner shell enclosed within a plastic outer drum, where the outer drum is rotomolded to form a closed head design with a bung opening in register with the inner shell's filling opening, enhancing durability and cleaning ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stainless-steel barrels are used, then durability and resistance to deformation are improved, but ease of cleaning deteriorates
Solution Approach 1:
The barrel is divided into two distinct parts: an inner stainless-steel shell for durability and an outer plastic drum for ease of cleaning. This segmentation allows each material to perform its optimal function without the drawbacks of using a single material for the entire structure.
Solution Approach 2:
The invention uses a composite structure combining stainless-steel and plastic materials. The inner shell uses stainless-steel for strength and deformation resistance, while the outer drum uses plastic for ease of cleaning and maintenance, creating a hybrid system that overcomes the limitations of single-material barrels.
2Reliability
If stainless-steel liners are used, then reliability for food and medical applications is improved, but device complexity increases
Solution Approach 1:
The barrel structure is segmented into an inner stainless-steel shell for reliability in food and medical applications, and an outer plastic drum for structural support. This segmentation maintains the reliability benefits of stainless-steel while simplifying the overall structure compared to fully metal construction.
Solution Approach 2:
By combining stainless-steel and plastic in a composite structure, the invention achieves the reliability required for food and medical fields through the stainless-steel inner shell, while the outer plastic drum provides simplified structural support, reducing overall device complexity.
3Strength
If stainless-steel barrels are used, then strength is improved, but ease of manufacture deteriorates
Solution Approach 1:
The manufacturing process is segmented into two independent steps: first manufacturing the inner stainless-steel shell, then manufacturing the outer plastic drum around it. This segmentation allows each component to be manufactured using optimal processes for its material, improving ease of manufacture while maintaining durability.
Solution Approach 2:
The composite structure enables independent manufacturing of the stainless-steel inner shell and plastic outer drum, allowing each material to be processed using its most suitable manufacturing techniques, thereby improving overall ease of manufacture while maintaining the strength benefits of stainless-steel.
4Strength
If outer shell is added, then protection against impact is improved, but weight increases
Solution Approach 1:
The outer plastic drum provides impact protection where needed, while the overall structure maintains a reasonable weight balance. The plastic material offers adequate impact resistance without the excessive weight that would result from using a fully metal construction.
Solution Approach 2:
The composite structure combines light plastic material with stainless-steel inner shell, achieving impact resistance through the layered construction while keeping the overall weight lower than a fully metal barrel, as plastic has a lower density than stainless-steel.
Data Source
AI summary
The present disclosure concerns process for manufacturing a closed head composite drum assembly, comprising: providing an inner shell defining a material-receiving cavity forming a material-filling opening in the inner shell; rotomolding at least partially a closed head outer drum defining an inner shell-containing cavity, the closed head outer drum at least partially enclosing the inner shell; and forming a bung opening in the closed head outer drum substantially in register with the material-filling opening. It also concerns a double wall closed head drum assembly.