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Pandey, C. N.
- Properties and Processing of Populus deltoides Bartr. For Producing Quality Sawn and Seasoned Timber
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Indian Forester, Vol 127, No 2 (2001), Pagination: 238-241Abstract
Plantation grown wood Populus deltoides, though presently available, possess problems in producing standard quality sawn and seasoned timber. Studies on air and conventional kiln drying behaviour revealed that though it is not difficult to dry, the material is prone to severe distortions like bow, crook and honeycombing. The reason for the tendency to warp is predominantly due to juvenile nature of wood and presence of residual growth stress. The major problem of this distortion degrade has been solved by adopting Saw Dry Rip method of sawing and high temperature seasoning. Recent improvements in processing have enabled this species to be commercially used for several value added products such as pencil making, doors and window shutters, light furnitures and for making quality packing cases etc. The details of the sawing and seasoning technology for Poplar are summarized in this paper.- Studies on the Utilization of Eucalyptus Hybrid for the Manufacture of Weft-pirns for Automatic Cotton Looms
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Indian Forester, Vol 118, No 11 (1992), Pagination: 800-806Abstract
The indigenous woods for weft-pirn making have been selected on the basis of available physical, mechanical and wood-working properties. In this report, physical, mechanical and wood-working properties of Eucalyptus hybrid are compared with those of the timbers given in IS: 4417-1967. Data on actual manufacturing trial indicated that Eucalyptus can be utilised for weft-pirn making. Weft-pirns made from Eucalyptus from two different sources appeared comparable with those made from white-cedar and resistance to moisture was within permissible limits. Sawing and seasoning technique for Eucalyptus wood are also discussed.- 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.- 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.- Seasoning Schedules of Four Hill Species-under-utilised Secondary Species of Timber
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Indian Forester, Vol 112, No 2 (1986), Pagination: 124-134Abstract
No Abstract- A New Approach to Seasoning of Eucalyptus Hybrid (Eucalyptus teretlcornis)
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Indian Forester, Vol 110, No 2 (1984), Pagination: 117-121Abstract
Eucalypts being a highly refractory timber develop severe collapse, aurface cracks, warping and twisting during the process of air or kiln seasoning in tangentially sawn planks, which is a conventional and most commonly used proces. The adoption of radial sawing of eucalypt logs have shown that defect free planks can be obtained and can he subsequently seasoned also without cracking, collapse or warping defects. New seasoning schedules for seasoning of Eucolyptul planka of 25 mm thick have also been evaluated.- Nondestructive Testing to Evaluate the Strength Properties of Timber
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Indian Forester, Vol 106, No 12 (1980), Pagination: 843-846Abstract
The purpose of the study described in this report was to investigate the nondestructive testing of maximum crushing strength of wood based on the relationship between its vibrational parameters and mechanical proderties. A close corvilinear relationship between maximum crushing strength and quantity ρ/V A was observed.- Relationship between Ultrasound Attenuation and Specific Gravity of Timber
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Indian Forester, Vol 104, No 9 (1978), Pagination: 615-620Abstract
In this Paper an endeavour has been made to establish simple relationship between ultrasound attenuation and specific gravity at a particular moisture content (as for as practicable) for various timber speeimens. As such from this relation by measuring the ultrasound attenuation quality of the material can be easily estimated in situ.- First Record of Feeding Trails of Dugong in Gulf of Kachchh (GoK), Gujarat
Abstract Views :327 |
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Indian Forester, Vol 138, No 10 (2012), Pagination: 968-969Abstract
No Abstarct- Development of PF Resin from Rice Straw Lignin Solid for Plywood Composite
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Indian Forester, Vol 139, No 8 (2013), Pagination: 720-725Abstract
Lignin-phenol-formaldehyde (LPF) resins were produced by substituting phenol with rice straw lignin in various percentages. Wood adhesive is certainly the most widely explored avenue of lignin utilization. Phenol was replaced by various percentages of lignin to keep the phenolic to formalin weight ratio constant to 1:1.8. 10%, 20% and 30% replacement of phenol by lignin were adopted in making lignin phenol formaldehyde resin (LPF Resin). The plywood panels of 4 mm thick, 30 × 30cm were made and the panels were subjected to test as per IS: 848:2006, specification for synthetic resin adhesives for plywood (Phenolic and Amino plastics). The results indicated that rice straw lignin was a feasible replacement for up to 30% of the phenol in PF resins.Keywords
Rice Straw Lignin, Adhesive, Plywood- Wood-based Panels Scenario in BRICS Countries
Abstract Views :222 |
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Affiliations
1 Indian Plywood Industries Research and Training Institute, Bangalore-560022, IN
1 Indian Plywood Industries Research and Training Institute, Bangalore-560022, IN