Greenhouse Screen Yarn Framework Extraction

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Solution Overview

Problem

Current greenhouse screens face challenges in minimizing radiation losses due to high emissivity of the yarn framework, reducing light transmission, and maintaining robustness while allowing for efficient water vapor transmission and easy installation, which are essential for energy-efficient and productive greenhouse environments.

Innovation Solution

A greenhouse screen design featuring a multilayer film with a thermoplastic polymer top layer and a yarn framework thermally bonded to the film strips, reducing the amount of yarn coverage on the upper side to minimize radiation losses and increase light transmission, while maintaining capillary action for water vapor transmission and robustness through thermal bonding and strategic placement of yarn threads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If aluminum laminate strips are knitted into the structure to achieve low emissivity, then radiation losses are reduced, but the yarn framework covering the top layer aluminum increases emissivity and decreases energy saving

Engineering Contradiction:

Improveradiation lossesVSAvoidyarn framework coverage

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent removes the harmful element (yarn framework) from the critical area (top layer surface) by positioning all yarn framework elements on the underside only, leaving the top layer exposed to minimize radiation losses while maintaining structural integrity through the underside framework

Inventive Principle:

Principle #2Taking out (Extraction)

2Loss of energy

If the amount of yarn is decreased to minimize radiation losses, then energy saving is improved, but the robustness of the screen may be compromised

Engineering Contradiction:

Improveradiation lossesVSAvoidrobustness

Core Design Contradiction:

Loss of energyVSStrength

Solution Approach 1:

The patent applies different yarn framework configurations to different sides of the screen: the underside has a complete yarn framework for structural robustness, while the top side has no yarn framework to minimize radiation losses, creating asymmetric local qualities optimized for each function

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent resolves the contradiction by moving the yarn framework to a different spatial dimension (underside only) rather than reducing its quantity, maintaining structural strength in the vertical dimension while eliminating radiative heat loss at the horizontal top surface

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Illumination intensity

If the amount of yarn used to construct the screen is decreased, then light transmission is improved, but the robustness and water transmission properties may be affected

Engineering Contradiction:

Improvelight transmissionVSAvoidrobustness

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The patent extracts the yarn framework from the light transmission path (top layer) and relocates it to the underside, eliminating light blocking while preserving structural support functions through the relocated framework

Inventive Principle:

Principle #2Taking out (Extraction)

4Loss of energy

If a two-layer greenhouse screen structure is used with reflective strips glued on top, then energy saving is improved, but the screen becomes less drapable and creates a big bundle in rested position

Engineering Contradiction:

Improveenergy savingVSAvoiddrapability

Core Design Contradiction:

Loss of energyVSEase of operation

Solution Approach 1:

The patent merges the reflective function and the structural framework into a single integrated layer rather than using separate reflective strips, eliminating the need for additional layers and their associated drapability issues while maintaining energy saving properties

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent makes the yarn framework multi-functional by having it provide both structural support and serve as the sole location for reflective elements, eliminating the need for separate reflective strips and simplifying the overall structure

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The solution significantly reduces radiation losses and increases light transmission, enhances the screen's robustness, and maintains efficient water vapor transmission, leading to improved energy savings and crop production without compromising other essential properties.

Implementation Method 1

a yarn framework thermally bonded to the film strips

Methodology Applied

Scientific EffectThermal bonding: Heating

Implementation Method 2

maintaining capillary action for water vapor transmission

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentEP2757869B1Greenhouse screen

Publication Date: 2015.11.04 LUDVIG SVENSSON INT

Figure 1A~1B
Figure 2~3
Figure 4

AI summary

The invention refers to a greenhouse screen comprising strips (11) of film material that are interconnected by a yarn framework of transverse threads (13a, 13b) and longitudinal threads (12) to form a continuous product, wherein the yarn framework is thermally bonded to at least one side of the strips (11) of film material, wherein also those parts of the yarn framework that is thermally bonded to the strips have liquid-transporting capacity by capillary action. The amount of yarn in the yarn framework interconnecting and holding the strips can herewith be reduced.