Low Pressure Lamination Research Articles

Novel Glass Polymer Multilayer Composites with High Toughness

With a view to developing low cost glass polymer multilayer composites (GPMLC) with high toughness, four layer laminar glass-epoxy-E glass fabric composites (GEF) were fabricated by a low pressure lamination technique. To promote weaker interfaces a thin sprayed layer of kerosene was introduced between the glass and the reinforcing layer in another group of composites (GEFK) fabricated in a similar manner. In both GEF and GEFK composites, a thin commercial cover slip gas disk (diameter 18 mm, thickness 0.3 mm) was used as the matrix layer. The load displacement plots of the GEF and GEFK composites exhibit a significant degree of non-linearity and stepped load-unload behaviour characteristic of fibre reinforced composites. The specific failure toad (»200 N/mm) and the total work of failure per unit volume (»300 kJ.m−3) of the GEFK composite were found out to be the highest, thus indicating the development of a very high toughness material. These values were much higher than those of the brittle glass matrix, e.g., 20 N/mm and 20 kJ.m−3. The GEF composites showed the second best characteristics.

New lamination technique to join ceramic green tapes for the manufacturing of multilayer devices

Lamination is a quality determining processing step in the manufacturing of ceramic multilayer devices. The common method to join stacked ceramic green tapes is thermo-compression. The binder phases of two adjacent green tapes are joined together at elevated temperatures and pressures. This causes mass flow, which prevents the production of complex 3D structures or fine patterns. The new lamination technique is based on a temporary gluing step. The green tapes are stuck together by an adhesive tape at room temperature under very low pressures. Even though the tapes are separated by the adhesive tape, the ceramic green tapes are joined homogeneously after sintering. In contrast to the thermo-compression method, the new cold low pressure lamination technique reduces deformations, and has a high potential for the lamination of undercut, complex 3D structures with small lines and spaces of the metallization.

Low pressure lamination of ceramic green tapes by gluing at room temperature

An advanced method to laminate ceramic green tapes is described. In contrast to the well-known thermo-compression method, in which a junction is produced at elevated temperatures and pressures, this method allows the laminates to be produced at room temperature under very low pressures. To aid the joining of the tapes, an adhesive system was utilised: a double-sided adhesive tape, consisting of an acrylate adhesive and a carrier film made of polyethyleneterephthalate (PET). The studies were carried out on two alumina-based green tapes having different grain sizes. The laminates were characterised in the sintered state using a scanning electron microscope. The polymeric reactions occurring during heat treatment were revealed by optical microscopy experiments, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and viscosity measurements. It was found that for a successful joining, a low viscosity polymer melt is necessary. At elevated temperatures it functions as a flux for the ceramic particles, allowing them to rearrange. Due to capillary actions the flux creates a drag on the ceramic layers, leading to interpenetration and a homogeneous body.

Color Uniformity in Low Pressure Laminates

Color Uniformity in Low Pressure Laminates

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