Synchronous Wood Press Segmentation for Uniform Curing
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Solution Overview
Problem
Existing wood product press apparatuses face challenges with slow heat transfer to the interior, premature adhesive curing, and structural complexity, particularly in continuous presses using convection or high-frequency heating, leading to issues like sudden water evaporation and adhesion failure.
Innovation Solution
A synchronous press apparatus with multiple presses in series, where each section of the product undergoes uniform treatment with controlled compression and heat input, allowing for equalization of internal temperature and vapor pressure, and adjustable operation parameters to optimize heat transfer and compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If convection heating is used in continuous presses, then heat can be conducted to the product, but heat transfer from surface to interior is slow and surface temperature increase causes sudden water evaporation
Solution Approach 1:
The continuous press is divided into multiple pressing sections (first pressing section, second pressing section, etc.) arranged in series. Each section applies compression and heating independently, allowing controlled heat transfer progression through the product layers without causing sudden evaporation. The segmentation enables gradual heat penetration while maintaining overall curing efficiency.
Solution Approach 2:
The stacking device pre-arranges veneer sheets and adhesive layers in a controlled manner before compression. The preliminary stacking configuration ensures proper heat distribution patterns and prevents localized overheating that would cause sudden water evaporation during the pressing process.
2Temperature
If high-frequency heating is used, then uniform heating in depth is achieved, but sudden local evaporation of water occurs and adhesion points may snap open
Solution Approach 1:
The pressing process is segmented into multiple sections that apply heat and compression progressively. This segmentation prevents sudden temperature spikes and localized evaporation that would cause adhesion failure, while still achieving uniform heating through the coordinated action of multiple pressing sections.
Solution Approach 2:
The multiple pressing sections operate in a coordinated sequence, applying compression and heat in periodic cycles throughout the product length. This periodic action ensures uniform heat distribution while allowing controlled evaporation and adhesion bonding at each section, preventing sudden local evaporation problems.
3Productivity
If a synchronous press with long construction is used, then production capacity is reasonable, but the device becomes structurally demanding and requires long stacking device
Solution Approach 1:
The pressing system is segmented into multiple independent pressing sections that can be arranged in series. This segmentation allows the system to achieve synchronous processing of multiple product sections simultaneously, increasing production capacity while keeping each individual pressing unit compact and structurally simple.
Solution Approach 2:
Instead of extending the pressing device lengthwise to increase capacity, the invention uses a multi-section arrangement where pressing sections are positioned at different locations along the product path. This dimensional arrangement achieves high productivity without requiring a excessively long single pressing unit.
4Productivity
If the leading end of product waits in stacking device, then product can be fed continuously, but adhesive absorbs moisture and cures prematurely
Solution Approach 1:
The stacking device performs preliminary arrangement of veneer sheets and adhesive layers in a controlled environment before compression. This preliminary action ensures proper moisture content and adhesive state are maintained during the feeding process, preventing premature curing while enabling continuous production.
Solution Approach 2:
The stacking device acts as an intermediary between the continuous feeding process and the compression process. It controls the moisture and temperature conditions during the waiting period, preventing adhesive premature curing while maintaining continuous product flow through the system.
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
This configuration ensures consistent and efficient curing of adhesives, reducing premature curing and adhesion failures, while simplifying the structural design and improving production capacity by maintaining uniform treatment across the product.
Implementation Method 1
The heating may be implemented by using the convection principle in which the heat is conducted to the press belts, and from them onwards to the product.
Implementation Method 2
High-frequency heating (RF, HF) is also commonly used, where the wave-energy created by the heating device is led directly to the product for achieving a dielectric heating effect.
Implementation Method 3
the product in place between the plates is compressed by forcing the press plates towards each other
Implementation Method 4
During compression, heat is conducted to the product by using some of the aforementioned methods
Data Source
AI summary
A press apparatus for curing adhesive on inner adhesion surfaces of substantially continuous wood products (1) under synchronous compression heating. The apparatus includes at least two presses (2) having a mutual distance from each other fulfilling the precondition: L/(n−1), where L is the working length of each press and n is the number of presses in series.