Modification of polycondensation adhesives with animal proteins. Part III. Industrial trials and results. The effort of authors is to determine the possibility of ecological and effective application of animal biopolymers into polycondensation adhesives used in woodworking industry. Modification of condensation adhesives with animal proteins were directed to urea-formaldehyde (Diakol Ml) and phenol-formaldehyde (Fenokol A) resins, with the aim to verify the influence of biopolymers on mechanical properties of plywood. The supposed source of biopolymers is solid waste from leather production (e.g. chromium shavings and chippings, hypodermic and adipose ligament, leather chippings, gelatine production and food packing). The aim of the research was the preparation and optimisation of technology for biopolymer production and following utilisation into adhesive mixtures with the application in woodworking industry in industrial conditions of Bučina Zvolen, a.s.. The solution of the problem of processing and application of animal biopolymers will be improved ecology at leather tanning and also in woodworking industry in the field of adhesive application and utilisation for furniture products.
Chemical stability, water resistance and the strength of glued joint of plywood are the important properties of any adhesive. This paper deals with UF adhesives modified with glutaraldehyde (GA) and collagen. GA was added to the UF adhesive to increase its structural stability. Collagen was added in the form of acid hydrolysate. The hydrolysate is chrome tanned leather waste; we searched the possibility to use the waste as a partial substitute of the adhesive. Shear strength was measured according to the EN 314-1,2: 1993 standard. The obtained results showed that simultaneous presence of collagen and GA in the UF adhesive mixture increased the shear strength of glued joints. The leather hydrolysate can be used as the additive to UF adhesives. Utilisation of leather hydrolysate as the secondary industrial raw material in UF adhesive production can be the positive contribution to the environment.
Pressure at wood gluing. The strength of a glued joint is dependant on several factors, both material and technological. This article focuses on pressing pressure and its effect on glued joints binding wooden members in various wood products.
The contribution evaluates the trials worked out of the 5. Frame programme of European commission „RESTORM". VIPO, a.s. Partizanske in co-operation with TU Zvolen together with UTB Zlín, CSIC Barcelona solves the preparation of biopolymers from the secondary raw sources with supposed application into eco-adhesives. Modification of polycondensation adhesives with animal proteins continued by application trials in laboratory and semi-production range.The aim of the research was the preparation and optimisation of biopolymer production technology and following utilisation into adhesive mixtures with the application in woodworking industry. The supposed source of biopolymers is solid waste from leather production (e.g. chromium shavings and chippings, hypodermic and adipose ligament, leather chippings, gelatine production and food packing).The solution of the problem of processing and application of animal biopolymers will be improved ecology at leather tanning and also in woodworking industry in the field of adhesive application.