Double Belt Press Localized Pressing Stamp for High Pressure Laminates
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Solution Overview
Problem
Conventional double belt presses are unable to generate the high pressures required to produce pore-free laminates from composite materials due to the large size of their pressing plates, which leads to belt deceleration and potential standstill, making continuous production of laminates from composite materials impractical.
Innovation Solution
The use of a pressing stamp with a smaller surface area than the pressing plate, allowing for the generation of high pressures across a wide press gap, combined with independent actuation of the pressing plate and stamp, and the incorporation of sliding surfaces and insulation layers for optimal force transmission and heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional pressing plates are used to generate high pressure, then the pressure required to eliminate trapped air is achieved, but the metal belts decelerate too much and reach a standstill
Solution Approach 1:
The pressing plate is designed with a localized pressing stamp that concentrates the pressing force on a smaller area (the laminate) rather than distributing it over the entire plate surface. This local quality change allows high pressure to be applied where needed while reducing the total force required, preventing belt deceleration
Solution Approach 2:
The invention changes the pressure distribution parameter by using a pressing stamp with smaller surface area than the pressing plate. This parameter change concentrates force locally, achieving the required pressure for pore-free laminates while reducing overall force application that would otherwise cause belt deceleration
2Stress or pressure
If pressing force is increased to achieve high pressure, then pore-free laminates are produced, but the force required causes belt deceleration and standstill
Solution Approach 1:
By concentrating the pressing force through a localized stamp rather than distributing it over the entire pressing plate, the invention achieves high pressure strength where needed while minimizing the total force required. This local quality approach prevents the harmful effect of excessive force causing belt deceleration
3Productivity
If continuous production is implemented, then productivity increases, but belt deceleration and standstill occur due to high pressing forces
Solution Approach 1:
The invention changes the force application parameters by using a pressing stamp with smaller surface area, which reduces the total force required while maintaining high pressure. This parameter change enables continuous production to proceed without belt deceleration, as the reduced force does not cause the belts to slow down or stop
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 continuous and economical production of high-quality laminates of any length by reducing the risk of belt deceleration, achieving high pressure over a wide area, and preventing material warping, while allowing for efficient force transmission and controlled heat input.
Implementation Method 1
Due to the surface of the pressing stamp being smaller in comparison to the pressing plate, the occurring forces acting normal to a belt surface decrease accordingly here, whereby the danger of the metal belts decelerating too much and reaching a standstill can be reduced and/or precluded. By means of the formation of the press device according to the invention, the production of laminates from composite materials by means of a double belt press is made possible. This entails the advantage that the laminates can be produced continuously, whereby the production can be made easier and more economical. Additionally, it is possible to produce laminates of any length. The invention also aids in achieving the advantage that a very high pressure can be generated in the region of the press gap over a great width of the metal belts.
Implementation Method 2
at least one sliding surface each, coming into contact with a surface section of one of the two metal belts, being arranged on the at least one pressing plate and the at least one pressing surface of the pressing stamp and on the at least one counter-pressure element
Implementation Method 3
at least one sliding surface each, coming into contact with a surface section of one of the two metal belts, being arranged on the at least one pressing plate and the at least one pressing surface of the pressing stamp and on the at least one counter-pressure element
Data Source
AI summary
A double belt press has at least one press device having at least one pressing plate and at least one counter-pressure element for the pressing plate spaced from each other. Portions of first and second endless and driven metal belts are guided, opposite one another, through a press gap located between the pressing plate sides facing one another and the plate-shaped counter-pressure element. The press device has at least one pressing stamp having a pressing surface movable toward the counter-pressure element and back again. The first and second endless metal belt portions guided through the press gap are guided between the pressing surface of the at least one pressing stamp and the at least one counter-pressure element, and the pressing surface of the pressing stamp is smaller than a surface of the side of the at least one pressing plate facing the at least one counter-pressure element.