Prediction of thickness distribution of thermoformed multilayer ABS/PMMA sheets

Abstract

In thermoforming, one of the main difficulties is to avoid the presence of weak thickness in the most deformed zones. After the heating stage, a bubbling step, leading to a first rate of deformation, is often used. In this work, we assess how the initial bubbling deformation can be controlled in order to obtain a homogeneous final thickness of the product. Experiments are performed on a multilayer sheet product. An industrial mould, corresponding to a casing of a nonlicensed car, was adapted on a lab thermoformer. After presenting experimental thermal profiles of the multilayer sheets measured during the heating stage, a first geometric model is investigated to predict the thickness distribution. Numerical results are compared with measurements.

Research and application of surface heat treatment for CO2 continuous laser ablation of polymeric methyl methacrylate materials

“…Uneven cooling during the production process oen leads to process defects such as warping and deformation of PMMA materials. 4 As a new green processing technology, the laser processing method improves the integrated processing and forming effect of PMMA sheets signicantly due to its characteristics of high precision, high efficiency, and no environmental pollution, which signicantly improves the integrated processing and forming effect of PMMA sheets. The continuous laser has a stable working state, that is steady state.…”

“…Uneven cooling during the production process often leads to process defects such as warping and deformation of PMMA materials. 4 …”

Application of parabolic blending for the estimation of thickness distribution in thermoformed products

“…Most of the studies have had a focus on changing the process parameters and type of forming for uniform thickness distribution in products. 5–11 Additionally, effort has been made to study the effect of the rheological properties of thermoplastic materials on total product quality. 12,13 In recent years, a number of studies have sought to determine the desired properties of materials non-destructively.…”

Influence of an Increased Fiber Filler Content on the Elongation Behavior of Filled Films in the Thermoforming Process

“…In the thermoforming process, there are a number of factors that influence the final quality of the formed film. Among other things, the final product quality is mainly determined by a homogeneous wall thickness distribution [10][11][12][13][14]. Thermoforming of reinforced components is mainly known from the area of fiberreinforced thermoplastics.…”