Pellets, mechanical properties

Tablet press Molding press Pellet mill 10 Up to 1 ton/hr flow and mechanical properties plastic preforms, metal parts, ceramics, clays, minerals, animal feeds...

The upper piston moves down by a fixed length. At this moment, the position of the upper piston defines the dimension of the finished pellet. The pressure applied to the pellet and the density of the finished pellet are implicitely defined by the mechanical properties of the powder and by the movement of the pistons. 

The mechanical properties (compression strength and % compression) are determined by Instron Universal Testing Machine using a pellet of 20mm x 20mm pressed at a pressure of 1000kgcnf2 similar to the method used for plastics [68]. 

Moderate doses, between 1.0 and 20 Mrad (10 to 200 kGy) on partially or completely formed articles and polymer pellets substantially reduce the content of residual monomer98 The mechanical properties of polystyrene are changed only at high radiation doses, which is characteristic of low cross-link yield and glassy morphology.99... 

In most spectroscopic studies, the solids to be studied are usually compressed to form pellets under pressures around 1.5-2 kbar. From an academic point of view, the stability of MTS towards pressure is very important, since most spectroscopic studies of lattice groups or adsorbed probes might be affected by a degradation of MTS during compression. For industrial applications compaction is crucial to handle the powder. Thus the mechanical properties of MTS are a very sensitive topic if we think about the future of these materials. Solids with such high porosity and small wall thickness are very likely to be crushed. Previous studies point out a very weak mechanical strength of MTS [3,4J which can jeopardize further industrial development. It has been demonstrated that these materials have the lowest mechanical stability among the... 

Mani, S., Tabil L.G. and Sokhansanj S. (2006). Effect of Compressive Force, Particle Size and Moisture Content on Mechanical Properties of Biomass Pellets From Grasses. Biomass Bioener., 30, 648-654. 

The polysiloxane network is formed during part fabrication. In injection molding, the acetylenic alcohol, which acts as a fugitive inhibitor of the vinyl-addition reaction, is volatilized at low temperature as the pellets enter the feed throat. The platinum complex is activated at the process temperature of the urethane (170-185 °C). The vinyl-addition reaction is initiated by the melt state, and the parts generated demonstrate mechanical properties consistent with the formation of a silicone IPN. The fabricated parts are translucent. The physical properties of this formulation (PTUE 205) are given in Table 1. 

Simulation can also be applied to longer length-scale phenomena. Examples include attempts to model the structural and mechanical properties of catalyst pellets, the mesopore structure of particle aggregates and phenomenological studies of crystallization. Here I mention just two examples, studies of crystallite morphology and quantitation of the effect of pore blockages on effective sorption capacities. 

Before use, all the polymer pellets were dried at Ta +20 K for at least 48 h. Then, sheets of controlled thickness B were firstly compression molded under vacuum at Ta + 50 K and then cooled down slowly through the glass transition region. Next, samples of dimensions suitable for the SENB tests were cut from the sheets with a diamond saw, machined to produce the notch, and annealed once more at Ta +20 K for 72 h. The purpose of this thermal treatment is double first, it allows the elimination of the residual stresses induced by sample pressing and machining and secondly, it permits removal of eventual moisture which is known to affect dramatically the SAPA mechanical properties [12]. The pre-crack was produced in the samples just before testing. 

Pigments could influence the mechanical properties of a film as well as the dissolution behavior of a drug substance from coated tablets or pellets. According to Rowe different pigments should be compared on the bases of the pigment volume concentration (PVC), which takes density differences into account [Eq. (3)],... 

The further advantage of the use of DMA to measure the mechanical properties of pellets is that it can also measure the loss modulus of the system, which when related to the storage modulus allows the derivation of the "Phase Angle" (89). A value of 0 will be... 

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