Board properties

J. J. Batelka, Corrugating Medium—Its Influence on Box Plant Operations and Combined Board Properties and Package Performance, Institute of Paper Science and Technology, Adanta, Ga., 1993. 

Felby C, Hassingboe J and Lund M. 2002. Pilot-scale production of fiberboards made by laccase oxidized wood fibers board properties and evidence for cross-linking of lignin. Enzyme Microb Technol 31(6) 736—741. 

U50 000 psi IB, minimum = 60 psi and linear expansion, maximum = 0.25. Properties of all examples given in Table II substantially surpass the comercial standard and also surpass the properties of the PF control boards with respect to linear expansion, thickness swelling, and absorption in the one-hour boil test. Internal bonds, both initial and after the one-hour boil test, and water immersion results of the HDA experimental boards were slightly inferior to results of these tests for the PF control boards. Properties of urea-formaldehyde control boards were similar to the PF control boards excepting in the one-hour boil test where complete failure of all bonding took place in about 15 minutes. 

Results obtained using 0.0 moles of hydrochloric acid and 0.1 to 1,0% of benzoyl peroxide were similar. When nitric acid was doubled and O.Oli moles of calcium chloride were substituted for the ammonium chloride the best board properties were obtained, Sulfuric acid, 0.036 moles and 1% benzoyl peroxide gave slightly inferior results but at a significantly lower density. Hence, the results outlined can be considered as roughly equivalent. 

By increasing furfuryl alcohol usage to 20, an exceptionally high internal bond and good dimensional stabilization were realized. Also, an amount of hydrochloric acid lower than any usage reported in Table VII, used with 10 furfuryl alcohol, gave board properties approximating those of the phenol formaldehyde control listed in Table II. 

Although forming and cold press operations density the interfelted sheet, little chemical change is effected at the temperatures used which are well below the boiling point of water. Major changes in board properties and some changes in... 

Winandy, J.E., Wang, Q.W., and White, R.H. 2008. Fire retardant-treated strand board Properties and fire performance. Wood Fiber Sci., 40(1), 62-71. 

Improvement in the particle board properties made by the process based on HNO3 surface activation and ammonium lignosul-fonate-furfuryl alcohol-maleic anhydride binder was reported to result from drying of the HNO3 treated chips (J90). 

Board properties determined were modulus of rupture (MOR), modulus of elasticity (MOE), swelling and water absorption after 24-hour water soak. Testing was done according to Japanese Industrial Standard (JIS) 5906 except that 130x 25 mm bending specimens were tested over a 50 mm span. 

Durability during four times repeated concrete placing was tested with 12 mm thickness Ecology Board for forms. After each run of concrete placing, a part of the boards was subjected to the determination of board properties. The other boards were air-dried for a few days and then used for next run of concrete placing. 

Effect of undefibrated paper particles on board properties... 

In this study, the defibration is one of the key steps for the good board performance. In order to see the effect of the ratio of undefibrated paper particles (incomplete defibration) on the board properties, shredded paper particles (12x3 mm) before going through defibration process were artificially mixed with completely defibrated fibers, and the boards were manufactured. Figure 7 and 8 show MOR and MOE of the boards respectively. 

Plotting 1/Cg against n/a, gives a straight line, from which both concerned board properties are gathered. Graphs show that independent of the size of the apparatus, this statement is backed up quite well. Various examples that influence both those parameters illustrate the use of this formaldehyde emission method. 

Subsequent to publication of the original work done by Udvardy (17), a multiple correlation analysis of all replicates of the data points was conducted at Mobay. A set of regression equations was generated for each binder studied. Each equation predicted one of the board properties in terms of a number of processing variables including panel density. Correlation coefficients were 0.8 for internal bonds for the Mondur E-lll panels with all others being 0.9 or greater. 

Oxidative coupling of lignocelluloslc materials has received major emphasis as a technique for inqiroved adhesion to wood. The underlying principles of oxidative coupling of phenolic compounds are well established (70) and have been practiced to some extent for many years in the manufacture of wet-process hardboard by using ferric sulfate, aluminum sulfate, and sulfuric acid to enhance board properties. Allan (71) measured the uptake... 

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