Wood Composite Board Density Control via Additive Scattering

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Solution Overview

Problem

Existing methods for producing wood-based panels struggle to spatially adapt the physical and chemical properties of the material, limiting the ability to customize properties like thermal conductivity, combustibility, and mechanical load distribution without introducing inhomogeneities or layer formation.

Innovation Solution

Introducing different amounts of additives at various positions within the particle cake during the scattering process, allowing for customized ratios of wood particles to additives and adhesives, and using a device with controlled scattering heads and nozzles to ensure precise distribution of additives and wood particles, ensuring homogeneous raw density and preventing layer formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If additives are sprinkled into the particle cake to change properties, then the physical and chemical properties of the wood-based panel are improved, but inhomogeneities and layer formation occur

Engineering Contradiction:

Improvespatial adaptation of panel propertiesVSAvoidhomogeneity of particle cake

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent applies additives to the wood particles before they are scattered to form the particle cake. This preliminary action ensures that additives are uniformly distributed throughout the particle cake during the scattering process, preventing inhomogeneities and layer formation while achieving spatial adaptation of panel properties.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent combines the scattering of wood particles and the application of additives into a single integrated process. By synchronizing these operations, the additives become incorporated uniformly with the wood particles during scattering, eliminating separate layer formation and ensuring homogeneous composition throughout the particle cake.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If additives are applied to the particle cake after scattering, then the composition is changed, but only surface layers are affected and inhomogeneity occurs

Engineering Contradiction:

Improveproperty customizationVSAvoiduniform distribution of additives

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies additives to wood particles before scattering occurs, ensuring that additives are distributed uniformly throughout the entire particle cake including core and surface layers. This preliminary application prevents the inhomogeneity that would result from post-scattering application.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent transitions from applying additives in a single dimension (surface application) to three-dimensional distribution by incorporating additives into particles before scattering. This dimensional change ensures uniform distribution throughout the entire volume of the particle cake.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Quantity of substance

If particles are removed from the particle cake to adjust density, then the amount of particles is reduced, but the ratio of wood particles to adhesive cannot be adjusted

Engineering Contradiction:

Improveparticle amountVSAvoidratio adjustment capability

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent changes the approach from removing particles to adding controlled amounts of additives during scattering. This parameter change enables independent adjustment of both particle quantity and additive ratios, providing versatile control over the final product composition without the limitations of particle removal methods.

Inventive Principle:

Principle #35Parameter changes

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

Enables the spatial adaptation of wood-based panel properties, such as reduced bulk density, enhanced fire resistance, and customized thermal and electrical conductivity, while maintaining homogeneous raw density and preventing inhomogeneities, thus improving the panel's performance and handling characteristics.

Implementation Method 1

a scattering device for scattering the wood particles and for introducing the at least one additive into the scattered wood particles

Methodology Applied

Scientific EffectParticle flow:

Implementation Method 2

pressing the particle cake to form a wood-based material panel under increased pressure and temperature

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentEP3470192B1Method and device for manufacturing a wood composite board

Publication Date: 2020.06.24 SWISS KRONO TEC AG

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AI summary

The invention relates to a method for producing a wood-based panel (2) with at least one layer having an inhomogeneous density profile, comprising the steps of: (a) scattering a plurality of wood particles into a particle cake, (b) pressing the particle cake into a layer of the wood-based panel (2), characterized by (c) scattering different sized, predetermined quantities of wood particles in at least two areas (4) within the particle cake.