C. N. Pandey , A. S. Kambo

Abstract

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.

Full Text

     

V. K. Jain , C. N. Pandey , K. L. Arora

Abstract

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.

Full Text

     

S. N. Sharma , C. N. Pandey

Abstract

Regressions of the form t-t_w + 5 = a/u_m + bU_m 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.

Full Text

     

H. P. Singh , C. N. Pandey , S. N. Sharma

Abstract

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.

Full Text

     

S. N. Sharma , C. N. Pandey , H. C. Kanojia , Mani Ram

Abstract

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.

Full Text

     

C. N. Pandey , B. L. Gandhi

Abstract

No Abstract

Full Text

     

C. N. Pandey , B. K. Gaur , H. C. Kanojia , Akash Chandra

Abstract

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.

Full Text

     

S. N. Sanyal , C. N. Pandey

Abstract

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.

Full Text

     

S. N. Sanyal , C. N. Pandey

Abstract

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.

Full Text

     

Yashpal Anand , Ketan Tatu , C. N. Pandey

Abstract

No Abstarct

Full Text

     

Vipin K. Chawla , Ranjana Yadav , C. N. Pandey , R. K. Jain , A. K. Dixit

Abstract

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

Full Text

     

V. K. Upadhyay ¹, Ravikala Kamath ¹, C. N. Pandey ¹

Affiliations
1 Indian Plywood Industries Research and Training Institute, Bangalore-560022, IN

Abstract

This paper assesses the pattern of wood based panel's production, consumption, import and export during 1991-2010 of BRICS (Brazil, Russia, India, China and South Africa) group of countries. The current scenario shows that BRICS production of wood-based panel is total of 119 million m ³ in 2010. When compared with the world scenario these countries have registered an increase in production from 5.5% to 44.4% and also an increase export quantity from 5.0% to 19.4% during 1991 to 2010. However, there has been decrease in the import quantity from 11.9% to 6.2%.Consumption pattern also indicates that there is an increasing growth from 18.6 million m³ in 1992 to 110.27 million m ³ by 2010. On the basis of the projections made it has been estimated that the BRICS countries will be the highest producer of wood based panels comprising nearly 51.47 per cent of the world output in 2015 and will reach to 54.51 per cent (210.85 million m³ ) by 2020 of global share. Among BRICS countries, share of China is expected to be nearly 45.25 per cent(175.01 million m³) which may be the leading country, Russia is second with 4.13 per cent (15.98 million m³ ) followed by Brazil 3.49 per cent (13.52 million m³), India 1.38 per cent (5.34 million m³) and that of South Africa 0.27 per cent (1 million m³) by 2020 of global share.

Keywords

Wood Based Panels, BRICS, Production, Import, Export, Consumption.

Full Text