Лесотехнически Университет

Summary

Determination of quality of production of the same kind is performed in its predominant part by means of sampling test. This also applies to manufacture of particleboards (PBs). Statistical methods allow assessing and comparing the quality of products. To assess and compare the quality of individual manufacturers with respect to standard requirements, an interval estimate of the arithmetic mean value of indices has been used, and to compare the quality between different manufacturers, a test of hypothesis with respect to mean values of two samples has been used.

After performed tests of laminated particleboards (LPBs) of different manufacturers, statistically significant differences in the quality level between individual manufacturers have been established.

The aim of the investigation is approval of methods for application of statistical methods when selecting a manufacturer / supplier of PBs according to objective criteria related to production quality.

Summary

The quality of each product is a set of a great number of indices and characteristics that define its ability to meet the consumers’ requirements.

By means of survey of specialists, the more important indices determining the quality of particleboards were ranked and weight factors for each index were calculated. With these weight factors, the determination of composite quality index of PBs will be possible. The results also give guidelines for improvement of the quality of this type of material.

Summary

Concealed hinges are most often used in modern furniture constructions. More and more hinge manufacturers are paying attention to this product group with the aim to improve strength and functional characteristics. To establish the suitability of these hinges for application in furniture constructions have been developed European standards. They however embedded only test in which the hinges have to pass or fail a certain test. No data for quantitative measurements related to the functional and operational characteristics of the hinges were found in the literature.

In this study was established information about deformation resistance of concealed hinges under adverse load conditions. Loads of 20 kg and 30 kg were applied vertically to the hinged door on vertical axis. The deflection and the functional parameters were measured.

After the tests it was found out the following:

Different models of hinges have different deflection resistance;

In some hinges the deformations are out of the acceptable values according to the standard.