The use of polyolefins-based hot melts for wood bonding

Use of innovative environmentally friendly adhesives for wood veneer bonding

“…Complete elimination of the toxicity of glues is possible only if for wood bonding thermoplastic polymers (hot-melts) like polyolefines or biodegradable synthetic or natural polymers like polyvinyl alcohol, starch, polylactic acid, soy, benzilated lignocellulose products, etc. are used [3][4][5][6]. For example, polyolefines (polyethylenes, polypropylenes, ethylene vinyl acetate Corresponding author, kajaks@ktfrtu.lv copolymers) were shown to serve as excellent glues (hot-melts) for wood veneer bonding in plywoods [3][4][5].…”

“…are used [3][4][5][6]. For example, polyolefines (polyethylenes, polypropylenes, ethylene vinyl acetate Corresponding author, kajaks@ktfrtu.lv copolymers) were shown to serve as excellent glues (hot-melts) for wood veneer bonding in plywoods [3][4][5]. The durability of polypropylene and modified polypropylene glues is equal to that of melamine-and phenol-formaldehyde resins.…”

“…They fill the bordering pit cavities and it is indicated that polypropylene melt dominantly ensures good mechanical adhesion into various wood elements and spaces in the veneer. The depth of penetrated polyolefin glues can reach 30^0 microns in wood surface [5]. The moisture content (8-25%) of core veneer does not influence gluebility [4].…”

“…The moisture content (8-25%) of core veneer does not influence gluebility [4]. All adhesive joints show good water resistance [5,6].…”

The Study of the Adhesive Activity and Modification Possibilities of Melamine-Urea-Formaldehyde (MUF), Urea-Formaldehyde (UF) Resins

“…NH4Cl (16 % solution in water) was used as a hardener. Adhesive properties were evaluated by shear strength measurements of the single overlap birch wood veneer joints [11]. Bending properties were tested for glued two veneer layer specimens (width of 2.54 cm, length of 15 cm), but impact strength was examined for specimens with width of 1 cm and length of 7 cm.…”