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Sharma, S. N.
- A Model for Indian Standard Kiln Drying Schedules for Timber Based on Diffusion Theory of Drying
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Indian Forester, Vol 116, No 2 (1990), Pagination: 121-130Abstract
Regressions of the form t-tw + 5 = a/um + bUm akin to the equation of the drying schedUle derived from the diffusion theory of drying, could be fitted to Indian Standard schedules I to VII of IS: 1141-1973 with high degree of correlation, indicating that these empirically evolved schedules by and large conform to the diffusion theory of drying. Values of the drying intensity parameter β derived from constants 'a' for the different schedules were found to be strongly correlated to the group mean basic density of the species falling under different schedules : β = .5954 + .5787 (1/ρ)- .1055 (lρ)2. It was Indicated that in general heavier timbers would call for milder drying schedules, though significant deviations from this trend should be expected in case of individual species on account of differences in physical properties other than basic density that influence moisture movement and drying degrade.
- Studies on Shrinkage Behaviour of Robinia pseudacacia Timber
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Indian Forester, Vol 116, No 10 (1990), Pagination: 832-836Abstract
Shrinkage behaviour of Robina pseudacacia was studied and its total tangential, radial and volumetric shrinkage was found as 7.7 %, 5.1 % and 10 % respectively which compares well with timbers like, Adina cordifolia, Dillellia pentagyna, Holoptelea integrifolia and Machiluus macrantha. Its retention of shape and size relative to teak was found as 73 % compared to teak taken as 100. The mean Inter-section Point (I.S.P) was estimated and found as 24 %. The species may be classed as moderately stable in shape and size, comparable to species commonly in use for furniture and joinery.- Studies on Physical and Mechanical Properties of Sterculia urens
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Indian Forester, Vol 114, No 4 (1988), Pagination: 230-237Abstract
Comprehensive tests done on physical and mechanical properties of Sterculia urens for the first time, have indicated it to be heavy to very heavy, very strong and very hard, but rather poor in splitting coefficient and retention of shape. On the basis of these tests the timber is considered suitable for use as posts, beams, rafters and tool handles. The timber planes and turns to a smooth finish and is also likely to be suitable after proper seasoning and adoption of alternative jointing techniques (such as use of dowels) for door and window frames, ordinary furniture and joinery.- Seasoning Behaviour and Related Properties of some Indian Species of Bamboo
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Indian Forester, Vol 114, No 10 (1988), Pagination: 613-621Abstract
The paper reviews the results of air and kiln drying experiments carried out on 9 species of Indian bamboos in the round. Seasoning behaviour of the species is described besides results of small scale experiments carried out on baking over open fire and water pre-soaking treatment. A process of chemical seasoning of round bamboo for handicrafts is set out. The paper also describes the shrinkage behaviour of round bamboo including variation of sbrinkage and density in the wall thickness. Effect of a pre-freezing treatment on shrinkage and collapse reduction has been discussed. The Intersection point and the variation of electrical resistance with moisture content have been examined.- Wood Bending by Vapour Phase Ammonia Plasticization
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Indian Forester, Vol 114, No 11 (1988), Pagination: 752-760Abstract
Trials with vapour phase ammonia plasticization of air-dried timber have indicated that species like Acrocarpus fraxinifolius, which are not amenable to steam bending, can be bent reasonably successfully and species like Mangifera indica, which respond to some extent to steam bending, can be bent to sharper curvatures by this technique. 13 mm strips of Grevillea robusta needed only 1 hr treatment at 5 kg/cm2 pressure to bend to a radius of 37 mm (R/T = 3) while Acrocarpus fraxinifolitius and Mangifera indica needed 3 hr treatment to achieve the same result. A higher wood moisture content at the time of treatment appeared 10 improve the rate and degree of plasticization and the bending behaviour. Further trials are proposed to produce bent wood furniture items using this technique.- A Comparative Study of CCA Treatment of Tree Guard Poles of Eucalyptus Hybrid by Sap-displacement and Boucherie Processes
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Indian Forester, Vol 114, No 12 (1988), Pagination: 854-864Abstract
The result of experiment carried out on treatment of freshly felled tree guard poles of Eucalyptus hybrid with CCA by the sap-displacement and Boucherie processes have been described in this paper.- Physical and Mechanical Properties of Acacia auriculaeformis from Karnataka
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Indian Forester, Vol 113, No 8 (1987), Pagination: 567-573Abstract
Physical and mechanical properties and suitability indices of Acacia auriculaeformis, an exotic species currently finding favour for firewood farming, have been evaluated. The data suggests that this species would be well worth trying for furniture, joinery, flooring, constructional purposes and tool handles besides turnery articles if logs in suitable girths are available.- Physical and Mechanical Properties of Enterolobium contortisiliquum (syn.Enterolobium timbouva)
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Indian Forester, Vol 112, No 1 (1986), Pagination: 69-74Abstract
Physical and mechanical properties in green and air dry conditions of Enterolobium contortisiliquum from FRL Campus, Bangalore have been reported. On compar son with "standard teak" (Tectona grandis) it is found that strength values are considerably lower than the corresponding, values. The timber is classified as light, very weak, not tough, very steady and very soft. It is considered worth trying for turnery articles like toys. Models, bangles etc. Besides drawing boards, picture frames and cigar boxes.- Assessing the Quantity of Stacked Pulpwood in Field Transactions
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Indian Forester, Vol 111, No 6 (1985), Pagination: 349-358Abstract
Rationalisation or the experiments carried out for determining volume/weight ratios for use in transactions of pulpwood at forest site have been proposed. The rationale of working out ratios that would assess the air-dry weight or material based on stack volume measurements has been emphasized, and design of experiments for determining such ratios has been presented.- Solar Drying of Veneer and Minor Forest Produce
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Indian Forester, Vol 109, No 5 (1983), Pagination: 309-312Abstract
Packed hed type solar air heaters having total collector area 10.3 m3 in 11 m length have been found to yield maximum outlet air tempentures between 90°C and 105°C during April to June at Dehra Dun at air mass flow rates between 2.77 and 5.54 kg/min. Average journal solar collection efficiencies varied between 45.5 and 62%. It is established that temperatures suitable for accelerate drying of veneer, sheet materials, wood wool and minor forest produce on a cottage or small scale can be easily and cheaply achieved by these solar air healers. A 10.3 m2 collector area has been estimated to sulie for a charge capacity of 51 m3 of 2 m n thick green veneer (chargetime 3½ hrs), somewhat more than 28 kg of sal seed (charge time 6½ hrs), and more than 900, 10-leaf bundles (charge 6½ hrs). Possibilities of supplemental solar heating of existing steam heated dryers by this system also exist.- Some Small-Scale Industries Based on Timbers of the Himalayan Region of Uttar Pradesh
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Indian Forester, Vol 104, No 6 (1978), Pagination: 421-430Abstract
Some small-scale industries based on timbers of the Himalayan region and suitable for establishment in the hill areas have been described. These are manufacture of compressed wood shuttle blocks, cotton mill pirn blocks, pencil slats, tool handles and tent mallet heads, semi-finished frames of tennis and badminton rackets, mathematical instruments etc. Approximate investments involved, machinery and inputs required and manufacturing proceses have also been briefly indicated.- Effect of Depth of Sowing on Germination of Kail (Pinus wallichiana) Seed
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Indian Forester, Vol 99, No 6 (1973), Pagination: 367-371Abstract
The results of the experiments conducted on the effect of depth of sowing on germination of kail seeds are reported. Sowings done up to 15 mllilmetres depth gave higher germination percentage than deeper sowings. Sowing of kail at a depth of 15 millimetres is recommended and sowing deeper than 25 millimetres should be avoided.- Trials on some Andaman Light Hardwooos for Pencil Making
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