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3 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

3 2018

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Influence of the type and thickness of low-density foamed upholstery materials on the comfort of furniture use

100%

Matwiej Ł. , Pawlik K.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

tom No. 104

504--514

The aim of this study was to analyze the impact of the type and thickness of selected polyurethane foams on the comfort of furniture use. The utilitarian objective included development of dependence catalogue of the comfort of polyurethane foams on their type and thickness. The comfort of polyurethane foams was determined using a sensory mat. Obtained results from determinations were elaborated and presented in tables and graphs. The conclusions stated that the best material (the most comfortable in use) for a woman is VP 3545 foam with a thickness of 40 mm and for man VP 2840 foam with a thickness of 90 mm and the dependence catalogue of polyurethane foams on their type and thickness were prepared.

Strength testing of upholstery frame connections and spring holders

80%

Matwiej Ł. , Skorupińska E. , Sydor M. , Wiaderek K.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

tom No. 104

579--592

The main objective of the completed tests and numerical analyses was to develop guidelines for improving the technical quality of massproduced upholstery frames. The paper describes the results of strength measurements of corner connections, corrugated spring holders and the permissible tension force of these corrugated springs. The experimental tests on the strength of the corner connections were performed for four variants of connection specimens. The tests investigated the strength of three different spring holders and the tension force of two versions of springs. The analysis of stiffness and strength of the entire frame was performed using the Finite Element Method (FEM), based on the data obtained during laboratory tests. Based on the results of the tested specimens of the corner connections, it was found as follows, in particular: 1) the value of the ultimate force on the staples in the connection has no significance for the strength of the connection (connection load capacity is determined by the load capacity of the adhesive-bonded joint; 2) the most advantageous structural variant of the spring holder was demonstrated; 3) the tension force of a single spring in the frame in the cases under consideration was in the range of 160-210 N which, during assembly, may temporarily reach 420 N. The dispersion of these force values is clearly different for springs from different manufacturers. Complementary numerical analyses have shown that the frame structure under analysis was rigid and durable, and as such it should not pose any risk during use.

The effect of the ageing process on physical properties of selected composite materials used in upholstery systems

80%

Matwiej Ł. , Peliński K. , Nowaczyk-Organista M. , Oleszek T.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

tom No. 103

132--145

The aim of this study was to determine the effect of ageing processes on selected physical properties of composite materials used in upholstery systems. The authors conducted tests using accelerated ageing methods, which facilitated continuous monitoring of process conditions and simulation of long-term ageing of materials. Tests were conducted on low-resilience (viscoelastic) polyurethanes and reference polyether materials. Tests showed considerable susceptibility to ageing factors in many key properties of low-resilience systems such as rigidity or Poisson’s ratio. Moreover, the analyses confirmed the practicality of applied accelerated testing methods, both in comparative analyses and their implementation in industrial practice.

Celem niniejszej pracy było oznaczenie wpływu procesów starzenia na wybrane właściwości fizyczne materiałów kompozytowych stosowanych w układach tapicerskich. Autorzy przeprowadzili badanie z wykorzystaniem metod przyspieszonego starzenia, co pozwoliło na ciągłą kontrolę warunków procesu i symulację długofalowego starzenia materiałów. Przebadano materiały z grupy poliuretanów niskosprężystych oraz referencyjnych polieterowych. W wyniku przeprowadzonych badań wykazano znaczą podatność na czynniki starzenia, wielu kluczowych właściwości układów niskosprężystych jak sztywność czy współczynnik Poissona. Badania potwierdziły ponadto praktyczny charakter wykorzystania przyspieszonych metod badawczych, zarówno w analizach porównawczych, jak i wdrożeniu do praktyki przemysłowej.