| Abstract: | CONCLUSION. The subject of this diploma thesis was to compare actual knowledge dealing with effects of bacterial damage of chips on final properties (physical-mechanical). Attention was focused on kraft cooking process, evaluation of unbleached chemical pulp and also changes of chemical pulp properties upon oxidative style processing of unbleached chemical pulp was mentioned. Microscopical analysis evidently suggest to fungi erosive influence followed by dissolving of cell walls and creation of holes. Thus increases loss of the weight and rasing porosity in samples which allows cooking solutions go through not only in trachea direction but also in the direction of pits and bordered pits. From examination patterns includes the biggest quantity of lignin after individual oxidative modification beech`s pattern attacking brown rot too. it makes that being erosive in a high degree ligninolitic fungi, in which give out into degradation of holocellulose and cellulose. Negative is in sample of beech which is attacking with c fungi causative white rot, where give out into lignin destruction . Specifications of Klason lignin allocate thereon, that per sulphated cooking get loss of effiency in lignin contents cca o 18,5 +- 0,2 % from atributes cca 22 % in all testing patterns in comparison with original pattern on values round 4 +- 2%. In consideration of lignin contents into input raw material get into big loss lignin contents in sulphonate cooking in woods pattern attackin with brown rot. Proportionaly in loss in lignin volumes go down levels of kappa numbers during which time achievement values white persons were they on levels 44 47 % MgO. For all that will be suppose needs thinking in bleaching and also use combination with strong whitening effects e.g . hydrogen peroxide. Cut-down efficiency oxygen delignification maybe watching in woods attack with brown rot. Alone effect wood-destroying fungi will cause equal loss LVC as per cooking, oxygen delignification and ozone stage together. In spite of loss LVC about sulphated cooking from level 1 174 cm3.g-1 in healthy woods on level of 615 cm3.g-1 in attack wood with brown rot a 624 cm3.g-1 in healthy woods after aplplication oxidative reagents majority values of mechanical facilities bleaching beech`pulp healthy or bacterial defect wood, is moving on levels asking for properties, maybe think, that contents bacterial defect woods in mixture split into delignification of the process will cause important cut-down properties pulp. Departure from the rule are only levels of porozity in all pulp sorts after Z stage. Minimum anomalies show chemical pulp pattern from wood attacking with white rot, also that just in parameters of Expressive loss extractive contents from wood raw materials in comparison with healthy beech is in attacting pattern fungus wood-destroying (at sample beech attack white rot o 50% a at sample beech attact brown rot o 78%). The biggest loss down extractive after acetonovej extraction is in sample attack brown rot. It is infistion, that structure of thi sample is the most distrubance after enzimatic activity from fungi,by consequence give out into degradate extractive material. Allocation quantity global sugar contradistinguish from expectation levels and representative at wholesome woods loss cca 10 %, in wood defect with white rot is that 31 % and in wood attack with brown rot 26 %. These substances they were not specified applications technique and show components, which say products another's structure look like sugar. In ...any... incident but anomalies from expectation extract sugar are higher. ...... are in pulp patterns from sulphated cooking (60 70 %). In pulp patterns from healthy wood present these anomalies after oxygen delignification and ozonic oxidation cca. 12% (O stage) a 18 % (Z stage). Departure from the rule are only levels of contents sugar after oxygen delignification (13 % white rot, 26 % brown rot) and ozone manipulated on chemical pulp curtailment from wood defect white (25,6 %) a hnedou rot (26,3 %). |
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