3D-Printed Press Pad for Uniform Pressure and Heat Distribution
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Solution Overview
Problem
Hydraulic heating presses face challenges in achieving uniform pressure and temperature distribution due to thickness tolerances in press arrangements, leading to non-transparent spots and uneven resin distribution, which results in flawed floor tiles.
Innovation Solution
A press pad produced using a 3-D printing process with a support fabric of metal threads and an elastomeric material applied according to digitized data of the press arrangement's topography, allowing for precise compensation of thickness and temperature differences, ensuring uniform pressure and heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If high specific pressing pressures are applied to compensate for thickness tolerances, then uniform pressure distribution is achieved, but resin flow increases excessively leading to insufficient resin layers and uneven gloss
Solution Approach 1:
The press pad incorporates regions with different elastomeric material densities or compositions to create localized pressure variations. Areas with higher elastomeric content provide greater pressure compensation where thickness tolerances are larger, while areas with lower elastomeric content prevent excessive resin flow where tolerances are tighter. This local differentiation allows uniform pressure distribution without causing excessive resin flow anywhere on the press surface.
Solution Approach 2:
The invention changes the physical parameters of the press pad by varying the elastomeric material properties (density, hardness, compressibility) across different regions. This parameter variation enables the press pad to adapt its pressure distribution characteristics to compensate for local thickness variations in the press arrangement, achieving uniform pressing pressure without uniform resin flow issues.
2Ease of manufacture
If press pads with uniform thickness are used, then manufacturing is simplified, but they cannot compensate for uneven thickness tolerances across the press surface
Solution Approach 1:
Instead of uniform thickness, the press pad features locally varied elastomeric material distribution where material density or layer thickness differs across the surface. This local quality variation enables the pad to conform to uneven press arrangement tolerances, providing appropriate pressure compensation in each region while maintaining a relatively simple overall structure.
Solution Approach 2:
The press pad uses a composite structure combining metal threads with elastomeric material in varying proportions across different regions. This composite approach allows tailored mechanical properties in different zones - areas with higher elastomeric content provide greater compliance for pressure compensation, while metal thread density provides structural support and heat conduction, achieving both manufacturing feasibility and functional performance.
3Productivity
If the press arrangement operates with thickness tolerances of 0.25-0.50 mm, then production efficiency is maintained, but non-transparent spots and voids form due to insufficient pressure compensation
Solution Approach 1:
The press pad implements local quality variations in elastomeric material distribution to provide targeted pressure compensation for the 0.25-0.50 mm thickness tolerances. Regions with higher elastomeric content compensate for areas with larger thickness variations, ensuring sufficient pressing pressure is maintained across the entire surface during short-cycle pressing, thereby preventing void formation and maintaining surface quality without extending press time.
Solution Approach 2:
The elastomeric material in the press pad acts as a pre-positioned cushion that anticipates and compensates for thickness variations before pressing begins. This beforehand cushioning effect ensures that pressure is evenly distributed from the start of the pressing cycle, preventing vapor bubble entrapment and non-transparent spots while maintaining the short press times required for production efficiency.
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 solution enables the production of void-free surfaces with uniform gloss and heat conductivity, addressing the issues of non-transparent spots and resin distribution, even for complex embossing structures.
Implementation Method 1
press pad (1) includes a support fabric (S) and an elastomeric material (4)
Implementation Method 2
support fabric advantageously including metal threads
Data Source
AI summary
A press pad for a hydraulic single- or multi-stage heating press, the press pad comprising: a support fabric advantageously including metal threads; and an elastomeric material application made from a crosslinked rubber material, characterized in that the elastomeric material application is applied by a 3-D printing method to the support fabric by a printing arrangement, wherein the application is performed as a function of predetermined digitized data of a 3-D topography of the desired elastomeric material application.