Resin-Coated Can Cooling for Uniform Edge Trimming
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Solution Overview
Problem
The softening of resin coatings on resin-coated cans due to elevated temperatures during molding causes uneven trimming when cutting edge portions, leading to defective cans.
Innovation Solution
A device comprising a press machine, a trimmer, and a cooling device in the form of a chute with air ducts and nozzles to cool the cans before trimming, ensuring uniform cutting of the resin coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resin-coated cans are trimmed by a trimmer after drawing and/or drawing-and-ironing using a press machine, then the molding process can be completed, but the resin coating becomes soft and extends at the edge portions causing uneven cutting
Solution Approach 1:
The patent applies preliminary action by cooling the resin-coated can immediately after molding while it is still hot and before the trimming operation. The cooling device is positioned to cool the can surface, particularly the edge portions, to below the glass transition temperature of the resin coating before trimming occurs. This preliminary cooling prevents the resin from being too soft during cutting, thereby achieving uniform cutting while maintaining productivity.
2Manufacturing precision
If the resin-coated can is cooled before trimming, then uniform cutting of resin coating is achieved, but additional cooling equipment and process steps are required
Solution Approach 1:
The patent merges the cooling function with the existing molding press machine by integrating a cooling device into the molding apparatus. The cooling device is positioned to cool the can immediately after molding, combining the molding and cooling operations into a single integrated process. This reduces the need for separate cooling equipment and process steps, thereby achieving uniform cutting without significantly increasing device complexity.
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
Uniform cutting of resin coatings is achieved, reducing the number of defective cans by effectively managing the temperature of the cans post-molding.
Implementation Method 1
a cooling device to cool at least, of resin-coated cans passing through the chute, portions to be trimmed by the trimmer
Data Source
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AI summary
An object is to provide a device and a method for producing resin-coated cans that make it possible to uniformly cut resin coating when resin-coated cans are trimmed after being pressed. A device for producing resin-coated cans includes a press machine, a trimmer, a chute connecting the trimmer to the press machine, and a cooling device to cool at least, of resin-coated cans passing through the chute, portions to be trimmed by the trimmer. A method for producing resin-coated cans, in which the resin-coated cans are conveyed to a trimmer by a chute after being processed by a press machine, includes cooling at least, of the resin-coated cans passing through the chute, portions to be trimmed by the trimmer.