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Multiple layers are formed by coextrusion, lamination, or various coating technologies. The material of construction of multilayered packaging ranges from paper to plastics to metals. Most multilayered packages are not readily recyclable. [2] Basf company and Uflex recently developed multilayered food packaging from 100% recyclable materials ...
Often co-extrusion is used to apply one or more layers on top of a base material to obtain specific properties such as UV-absorption, texture, oxygen permeation resistance, or energy reflection. A common post-extrusion process for plastic sheet stock is thermoforming , where the sheet is heated until soft (plastic), and formed via a mold into a ...
Coextrusion is common in sheet and film extrusion, allowing for speedy production of multi-layered parts. This is accomplished by joining multiple polymer melts in either the manifold or approach stage. Layers of different thicknesses may be formed by introducing melts at different flow rates or different manifold sizes.
A variant of wet spinning is dry-jet wet spinning, where the spinning solution passes through an air-gap prior to being submerged into the coagulation bath. This method is used in Lyocell spinning of dissolved cellulose, and can lead to higher polymer orientation due to the higher stretchability of the spinning solution versus the precipitated ...
Extrusion coating is the coating of a molten web of synthetic resin onto a substrate material. It is a versatile coating technique used for the economic application of various plastics , notably polyethylene , onto paperboard , corrugated fiberboard , paper , aluminium foils , cellulose , non-wovens , or plastic films .
The substrate side of the board contains a heat-activated adhesive that bonds the print to the substrate. This can be any of a number of board products or another sheet of laminate. The pouch containing the print, laminate, and substrate is passed through a set of heated rollers under pressure, ensuring that all adhesive layers bond to one another.
Material extrusion-based additive manufacturing (EAM) represents one of the seven categories of 3D printing processes, defined by the ISO international standard 17296-2. While it is mostly used for plastics, under the name of FDM or FFF , it can also be used for metals and ceramics.
Layer-by-layer (LbL) deposition is a thin film fabrication technique. The films are formed by depositing alternating layers of complementary materials with wash steps in between. This can be accomplished by using various techniques such as immersion, spin, spray, electromagnetism, or fluidics. [1]