Fish Feed Outer Shell Protruding Ends Oil Leakage
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Solution Overview
Problem
The two-layered structure feed for fish farming, particularly for tuna species, experiences leakage of liquid oil from the seam joints of the outer shell due to thinning, leading to a low non-defective rate and reduced feed intake.
Innovation Solution
The feed features an outer shell with a protruding portion at both ends, increasing the thickness towards the end portions, and a diameter reducing portion with a curved surface, which reduces the likelihood of liquid oil leakage and enhances the feed's palatability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a two-layered structure feed is molded using an encrusting machine, then the feed achieves high feed intake and feed efficiency, but liquid oil leaks from the seam joints of the outer shell at both ends
Solution Approach 1:
The outer shell is designed with non-uniform thickness, featuring protruding portions at both ends that are thicker than the middle section. This local variation in thickness provides enhanced structural strength at the end portions where liquid oil leakage occurs, while maintaining the overall cylindrical shape and feed intake characteristics.
Solution Approach 2:
The end portions of the outer shell are designed with curved surfaces rather than flat or angular structures. These curved protruding portions smoothly transition the thickness variation, providing both structural reinforcement against oil leakage and improved palatability for fish consumption.
2Productivity
If the outer shell is made thinner to improve palatability, then feed intake increases, but liquid oil leakage from seam joints becomes more severe
Solution Approach 1:
The outer shell employs differential thickness design where the middle section remains thin for enhanced palatability and feed intake, while the end portions feature protruding sections with increased thickness to prevent liquid oil leakage. This localized thickening does not compromise the overall palatability while effectively addressing the leakage issue.
3Reliability
If the outer shell thickness is increased to prevent liquid oil leakage, then non-defective rate improves, but feed intake may be reduced
Solution Approach 1:
Instead of uniformly increasing the outer shell thickness throughout, the invention applies localized thickening only at the end portions through protruding structures. This selective approach provides the necessary structural strength to prevent liquid oil leakage and improve non-defective rate, while maintaining a thinner profile in the middle section that preserves feed intake and palatability.
Data Source
AI summary
The purpose of the present invention is to improve the non-defective rate of a feed for fish farming comprising a feed of dual structure through betterment of the shape of an outer envelope of the feed so as to reduce the possibility of leakage, from both ends of the feed, of a liquid oil contained in an inner capsule. The feed for fish farming of Scombridae family fish includes an outer shell forming an outer surface; and an inner filling wrapped by the outer shell such that a side surface presents a substantially cylindrical shape and both end portions are covered and closed by the outer shell, at least one of the both end portions being formed with a protruding portion having a tapering shape in which the outer shell protrudes toward the end portion.