Effect of inhomogeneous temperature distribution on the impregnation process of the continuous compression molding technology

Abstract

The demand for continuous fiber-reinforced thermoplastics has steadily increased during the last years due to their specific properties. But considering the applications in large-scale production, the price for the organic sheets is still too high in order to compete with the metal counterparts. A starting point for the reduction of the total costs is the acceleration of the impregnation process by in-plane polymer flow. For this reason, this scientific report provides an insight into the production process using a continuous compression molding machine. In order to analyze the in-plane polymer flow and its driving forces, a method for the evaluation of the pressure distribution is presented in a first step. The examination revealed a significant inhomogeneous pressure distribution for the whole pressing area, which could be affected by different temperature settings. Afterward, the impregnation quality was correlated with the different settings, followed by the illustration of a huge potential for increasing the impregnation speed.

In Situ Liquid‐Phase Growth Strategies of g‐C3N4Solar‐Driven Heterogeneous Catalysts for Environmental Applications

“…[ 66 ] On the contrary, by selecting the appropriate carrier, composite catalysts can be provided with the required physical structure characteristics, such as specific surface area, hole radius, mechanical strength, and thermal conductivity. [ 67 ] In the field of photocatalysis, the impregnation method has gained increasing attention owing to its simplicity and high efficiency in building heterojunctions. When the granular carrier is impregnated, the surface structure and morphology of the carrier, such as specific surface area, porosity, and pore size, have various impacts on the photoelectric properties of the composites.…”

Increasing the performance of continuous compression moulding by local pressure adaption

“…An optimisation potential would be a convex curved flow front (Figure 3 right). With a specific adaption of the tool geometry, the macro flow front of the melt can be controlled to a boomerang-shape and the impregnation can be accelerated by a mixture of axial and transversal flow behaviour around the fibre bundles [11,12].…”

Manufacturing of bio-polyamide 11/basalt thermoplastic laminates by hot compaction: The key-role of matrix rheology

“…[8][9][10][11] The key parameters of film stacking are temperature of the mold, pressure, and duration of the compaction, and their correct definition is crucial for the success of the process. [12][13][14] TLs with good mechanical performances are only obtained when the molten polymer permeates the fiber fabrics fillings all the voids and producing a fully consolidated laminate. This ensures an efficient stress transfer from the matrix to the fibers, and the absence of stress concentrators such as (micro)voids further strengthen the TL.…”