In designing a multi-product flowline, problem of material handling and workilow arise on one hand and of machine utilization on the other. Because of variations in the number of operations on parts and in their operation sequences, a sequence of machines that satisfies one particular family of parts is unlikely to satisfy all the other families. On the other hand, if a sequence is generated to accommodate all the families of parta, a simple flowline is unlikely. This is the problem of the layout of multi-product flowlines.Most of the solution techniques available are for the single-machine case which is a restricted aapect of the problem. Solution of the general machine case has received very little attention in the literature.This paper considers all the facets of the problem. It advances a solution technique baaed on the link-analysis or travel-charting method. The technique is all embracing and hence can be tailored to satisfy the requirements of either a single machine or the general machine situation. Manual implementation of the design algorithm ia illustrated by an example.
Accumulation of knowledge in and practical experience of simple flowlines and group technology flowlines indicates that no comprehensive classification of the alternative configurations is available. Those developed in the mass production context do not sufficiently reflect the possibilities in group systems, while those quoted in the group technology context tend to be superficial. This paper is aimed at overcoming t.his problem. It. integrn tus all the variet.ics of flowlines into (HlP (·Iassifit-atioll scheme. It also Sllgg(~St.s the materials flow system for each identified flowline in the scheme.
IntroductionThe evolution of a flowline classification is a complex exercise, not only because there are differences in language, terminology and concepts among writers and industries, but also because some of the concepts are still in their infancy and hence not throroughly established. However, an attempt will be made here at evolving a scheme of classification of the production flowlines; only, however, after a perusal and agglomeration of some of the existing concepts due to Wild, Burbidge, Carrie and Petrov.
Response surface methodology was used to investigate the effects of temperature, thickness and time on the drying of water yam slices and to determine the optimised condition for hot air drying. The predominant falling rate drying regime was observed. Experiments were performed at air temperature of 60 o C, 70 o C and 80 o C, slice thickness of 4, 6 and 8mm and drying times of 60, 165 and 270minutes. Based on response surface and desirability functions, the optimum conditions for water yam drying were: air temperature70 O C, 74.9 O C, slice thickness 6mm, 6.6mm and drying time 165minutes, 116.1minutes for untreated and treated water yam respectively. At this point, the predicted responses for drying rate were 0.000345kg/m 2 s, 0.000358kg/m 2 s respectively.
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