Plastics is one of the world’s largest and fastest growing industries, ranked as one of the few multi-billion dollar industries. Due to the vast improvements in polymers and production processes, plastics are now amongst the world’s most widely used materials, with the world consumption of polymers surpassing steel in volume and weight. Injection molding represents approximately 32% (by weight)...

Title of Thesis: Computer Aided Design of Side Actions for Injection Molding of Complex Parts Ashis Gopal Banerjee, Master of Science, 2006 Thesis directed by: Associate Professor Satyandra K. Gupta Department of Mechanical Engineering Often complex molded parts include undercuts, patches on the part boundaries that are not accessible along the main mold opening directions. Undercuts are molded...

In the framework of structural optimization via a level-set method, we develop an approach to handle the directional molding constraint for cast parts. A novel molding condition is formulated and a penalization method is used to enforce the constraint. A first advantage of our new approach is that it does not require to start from a feasible initialization, but it guarantees the convergence to ...

Background and aims. The aim of this study was to compare flexural strength of specimens processed by conventional and injection-molding techniques. Materials and methods. Conventional pressure-packed PMMA was used for conventional pressure-packed and injection-molded PMMA was used for injection-molding techniques. After processing, 15 specimens were stored in distilled water at room temperatur...

Polymeric microneedles fabricated by microinjection molding techniques have been demonstrated using Topas COC as the molding plastic material. Open-channel microneedles with cross-sectional area of 100 lm · 100 lm were designed and fabricated on top of a shank of 4.7 mm in length, 0.6 mm in width, and 0.5 mm in depth. The tip of the microneedle has a round shape with a radius of 125 lm as limit...

1. Abstract A novel strategy for handling the molding constraint for cast parts is presented. In a first step, a simple projection method for the velocity field is applied. If the optimized shape violates thickness constraints, this projection method is no longer sufficient and a general molding constraint is applied at the same time with thickness control. We apply an augmented Lagrangian meth...

Asymmetrical headshape in infants has increased markedly since the 1992 recommendation of the American Academy of Pediatrics to reduce the risk of sudden infant death syndrome by avoiding the prone sleeping position. Cranial molding correlated to restrictive intrauterine environment, birth trauma, torticollis, positioning, lack of full bone mineralization, neurological deficits, and any combina...

The aim of the present investigation is to compare two rapid molding (RM) solutions, namely polyjet printing (PP) and silicon molding (SM), for the manufacture of plastic components. The comparison has been made on the basis of dimensional accuracy (as per IT grades), mechanical properties (namely surface hardness, surface roughness) and production cost. The comparison of the experimental resul...

To observe the therapeutic effect of rats with spinal cord injury through HBO and BMSCs transplantation. Jointly manufacture 60 SCI rat models, which shall be divided into the control group, BMSCs group and treatment group by adopting the random number table, 20 rats for each group. The HBO treatment shall be conducted to the rats in the treatment group for 2 times every day after molding; what...

background : this research provides an insight into exposure information and particle size distributions of bisphenol a (bpa), a common environmental hormone, at polycarbonate (pc) molding plants in southern taiwan. methods : the inhalable dust sampler as iom and the micro-orifice uniform deposition impactor (moudi) were used for samples collection to evaluate the level and particle size distri...