X-RAY DENSITOMETRY IN THE EVALUATION OF DENSITY IN PARTICLEBOARD PANEL

Gonçalves, Fabricio Gomes; Lelis, Roberto Carlos Costa; Carvalho, Alexandre Monteiro de; Tomazello Filho, Mário

doi:10.5902/1980509833382

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Artigos • Ciênc. Florest. 28 (03) • Jul-Sep 2018 • https://doi.org/10.5902/1980509833382 copy

X-RAY DENSITOMETRY IN THE EVALUATION OF DENSITY IN PARTICLEBOARD PANEL

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This study aimed to determine the apparent density, by gravimetric technique and X-ray microdensitometry of particleboard produced with Acacia mangium wood and search existence of correlation between both methods. It was used urea formaldehyde adhesive and commercial tannin Acacia mearnsii applied in powder form directly to the previously glued particles. The panels manufactured using four compression ratios (1.39, 1.55, 1.73, and 2.00) combined four levels of powdered tannin (0, 10, 20 and 30%), making up 16 treatments (4 panels by treatment). The particleboard apparent density parameters (mean, maximum and minimum) and gravimetric density were determined, analyzed and compared. The density profile presented graphically and interpreted by analysis of variance and multiple linear regression. The apparent density, medium, maximum and minimum for particleboard obtained by microdensitometry X-ray ranged 357-697 kg/m³, 386-824 kg/m³, and 334-634 kg/m³, respectively, and gravimetric method 369-742 kg/m³. The technique was effective in determining variations in the density profile in the thickness of the particleboards in all treatments, as well as direct obtain the apparent density. These variations could be reduced if the tannin used was previously hydrated in water. Was found strong correlation (R² = 0.99) between the mean apparent density obtained by X-ray microdensitometer and gravimetric method.

Keywords:
quality panel; non-destructive analysis; density profile

Tabela 1 Descrição dos tratamentos utilizados na fabricação dos painéis aglomerados homogêneos

Tratamento	Descrição
	Razão de compactação	Proporção de Tanino em pó Aplicado às partículas
	Razão de compactação	previamente encoladas com ureia formaldeído
T1	1,39	0:100
T2		10:90
T3		20:80
T4		30:70
T5	1,55	0:100
T6		10:90
T7		20:80
T8		30:70
T9	1,73	0:100
T10		10:90
T11		20:80
T12		30:70
T13	2,00	0:100
T14		10:90
T15		20:80
T16		30:70

Tabela 2 Valores médios de densidade aparente determinada por microdensitometria de raios X e por método gravimetria dos painéis de partículas de madeira de Acacia mangium

Tratamento	Densidade aparente dos painéis (kg/m³) por Microdensitometria de raios X			Gravimetria Média (kg/m³)
Tratamento	Média	Máxima	Mínima	Gravimetria Média (kg/m³)
T1	450 ± 45 a	510 ± 72 a	420 ± 40 a	460 ± 41 a
T2	420 ± 36 a	470 ± 44 a	390 ± 35 a	440 ± 35 a
T3	470 ± 84 a	520 ± 11 a	430 ± 76 a	480 ± 88 a
T4	440 ± 61 a	480 ± 65 a	410 ± 54 a	450 ± 64 a
T5	450 ± 38 a	510 ± 62 a	410 ± 37 a	460 ± 37 a
T6	470 ± 49 a	530 ± 50 a	430 ± 47 a	500 ± 53 a
T7	450 ± 51 a	520 ± 65 a	370 ± 12 a	470 ± 57 a
T8	550 ± 49 b	640 ± 72 b	490 ± 40 b	570 ± 50 b
T9	510 ± 40 b	590 ± 46 a	470 ± 40 b	540 ± 41 b
T10	540 ± 53 b	630 ± 70 b	490 ± 50 b	560 ± 52 b
T11	530 ± 50 b	630 ± 71 b	480 ± 45 b	570 ± 55 b
T12	470 ± 65 a	540 ± 79 a	420 ± 50 a	490 ± 65 a
T13	570 ± 46 b	670 ± 65 b	500 ± 49 b	600 ± 50 b
T14	610 ± 58 c	720 ± 54 c	560 ± 52 b	650 ± 59 c
T15	620 ± 46 c	750 ± 54 c	550 ± 55 b	660 ± 50 c
T16	590 ± 91 c	690 ± 11 c	520 ± 83 b	610 ± 88 c

Universidade Federal de Santa Maria Av. Roraima, 1.000, 97105-900 Santa Maria RS Brasil, Tel. : (55 55)3220-8444 r.37, Fax: (55 55)3220-8444 r.22 - Santa Maria - RS - Brazil
E-mail: cienciaflorestal@ufsm.br

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