Knitted Monofilament Insect Screen for High Opening Rate
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Solution Overview
Problem
Existing insect screens for greenhouses and open-field crops face challenges in providing an effective anti-insect barrier while maintaining adequate ventilation and longevity, as they often have low opening rates and rigidity due to large thread diameters, which restrict air exchange and are prone to fraying and mechanical stress.
Innovation Solution
A screen made from a net produced by chain stitch knitting using monofilaments with diameters between 0.04 to 0.1mm, allowing for higher opening rates and improved air and light transmission, with orifice geometries that can be varied to suit specific insect sizes, and featuring gripping zones for easy manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large diameter threads are used in woven nets, then mechanical strength and resistance to slipping are improved, but opening rate decreases and air exchange is restricted
Solution Approach 1:
The patent changes the fundamental parameters of thread diameter and weaving method. By using very fine monofilaments (0.04-0.1mm) instead of large diameter threads, and switching from woven to knitted construction, the patent achieves both high mechanical strength and high opening rate (>50%) simultaneously, resolving the contradiction between strength and opening rate
2Stability of the object's composition
If large diameter wires are used, then network cohesion is improved, but rigidity increases and folding/unfolding capability is reduced
Solution Approach 1:
The patent changes the material parameters from large diameter wires to very fine monofilaments (0.04-0.1mm) and adopts knitted construction instead of woven. This parameter change reduces rigidity while maintaining network cohesion through the knitted structure's inherent flexibility, enabling easy folding and unfolding for greenhouse opening operations
3Reliability
If woven fabrics are used, then mechanical barrier against insects is ensured, but fraying occurs during cutting and implementation
Solution Approach 1:
The patent replaces the woven mechanical structure with a knitted structure. The knitted construction inherently prevents fraying that occurs in woven fabrics during cutting and installation, while maintaining the mechanical barrier function against insects through the continuous knitted mesh
4Reliability
If low opening rate nets are used, then insect barrier is ensured, but air exchange and crop aeration are compromised
Solution Approach 1:
The patent fundamentally changes the construction parameters by using very fine monofilaments (0.04-0.1mm) and knitted methodology, enabling the net to achieve an opening rate greater than 50% while maintaining effective insect barrier functionality, thus resolving the contradiction between barrier effectiveness and air exchange
Data Source
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AI summary
The anti-insect screen of the present invention comprises a net made of textile threads, said net being made by cast-off stitch knitting on a warp or Rachel machine.