Effects of Press Parameters on Some Technological Properties of Polystren Composite Plywood

Demirkır, Cenk; Öztürk, Hasan; Çolakoğlu, Gürsel

doi:10.17475/kastorman.285645

Cited by 10 publications

(21 citation statements)

References 3 publications

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“…One of the possible directions is the creation of wood composites based on environmentally-friendly products, where thermoplastics (polyethylene, polypropylene, poly(vinyl chloride), and their copolymers) are used as adhesives. Already, there is a positive experience in the creation and use of wood composites based on thermoplastics [6,7,8,9,10,11,12,13,14,15,16,17,18,19]. Waste polyethylene can be used in the manufacture of oriented strand board (OSB) panels, resulting in the enhancement of thickness swelling, humidity, dimensional stability, water absorption, and screw withdrawal resistance [6].…”

Section: Introductionmentioning

confidence: 99%

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Environmentally-Friendly High-Density Polyethylene-Bonded Plywood Panels

Bekhta

Sedliacik

2019

Polymers

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Thermoplastic films exhibit good potential to be used as adhesives for the production of veneer-based composites. This work presents the first effort to develop and evaluate composites based on alder veneers and high-density polyethylene (HDPE) film. The effects of hot-pressing temperature (140, 160, and 180 °C), hot-pressing pressure (0.8, 1.2, and 1.6 MPa), hot-pressing time (1, 2, 3, and 5 min), and type of adhesives on the physical and mechanical properties of alder plywood panels were investigated. The effects of these variables on the core-layer temperature during the hot pressing of multiplywood panels using various adhesives were also studied. Three types of adhesives were used: urea–formaldehyde (UF), phenol–formaldehyde (PF), and HDPE film. UF and PF adhesives were used for the comparison. The findings of this work indicate that formaldehyde-free HDPE film adhesive gave values of mechanical properties of alder plywood panels that are comparable to those obtained with traditional UF and PF adhesives, even though the adhesive dosage and pressing pressure were lower than when UF and PF adhesives were used. The obtained bonding strength values of HDPE-bonded alder plywood panels ranged from 0.74 to 2.38 MPa and met the European Standard EN 314-2 for Class 1 plywood. The optimum conditions for the bonding of HDPE plywood were 160 °C, 0.8 MPa, and 3 min.

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Section: Introductionmentioning

confidence: 99%

“…The thermoplastic polymers were successfully used for coating of birch plywood [8,9,10]. Formaldehyde-free wood–plastic plywood has been successfully produced using thermoplastic polymers as wood adhesive [11,12,13,14,15,16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Environmentally-Friendly High-Density Polyethylene-Bonded Plywood Panels

Bekhta

Sedliacik

2019

Polymers

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“…The great advantage of such polymers is that the formaldehyde emission of the plywood made by recycled plastics is very low compared to that of ordinary plywood made with urea-formaldehyde resin: the amount of emission is almost zero [18]. Formaldehyde-free wood-plastic plywood has been successfully produced using thermoplastic polymers as wood adhesive [18][19][20][21][22][23][24]. The various thermoplastic polymers were used for veneer bonding: low-density polyethylene (LDPE) [25], high-density polyethylene (HDPE) [17,19,20,24,26,27], PS [21,28], PP [16,23], or PVC [29,30].…”

Section: Introductionmentioning

confidence: 99%

“…Formaldehyde-free wood-plastic plywood has been successfully produced using thermoplastic polymers as wood adhesive [18][19][20][21][22][23][24]. The various thermoplastic polymers were used for veneer bonding: low-density polyethylene (LDPE) [25], high-density polyethylene (HDPE) [17,19,20,24,26,27], PS [21,28], PP [16,23], or PVC [29,30]. The thermoplastic polymers were used for veneer bonding in various forms, such as textile fiber waste (polyurethane, polyamide-6) [16], recycled plastic shopping bags [18,26], or film [17,19,20,[22][23][24]27,29,30].…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that polystyrene wastes can be used in plywood manufacturing as an alternative bonding material for interior uses [21,28]. It was shown that low-pressure pre-heating is a necessary step allowing for increasing the final shear strength of the wood thermoplastic joints and avoiding the indentation of thermoplastic particles to wood [28].…”

Section: Introductionmentioning

confidence: 99%

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Properties of Thermoplastic-Bonded Plywood: Effects of the Wood Species and Types of the Thermoplastic Films

2020

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There are a lack of proper adhesives that meet the wood industry requirements of being environmentally friendly, low cost, and easy to use; thus, the application of thermoplastic polymers, especially films, is promising. This work expands our knowledge about the possibility of using thermoplastic films for the production of environmentally friendly plywood. The effects of the adhesives type and wood species on the properties of plastic film bonded plywood were studied. Sliced veneers of two hardwoods (birch and beech) and one softwood (spruce) were used in the experiments. Three types of thermoplastic films—low-density polyethylene (LDPE), co-polyamide (CoPA), and co-polyester (CoPE)—were used as an adhesive for bonding plywood samples. Melamine–urea–formaldehyde (MUF) resin was used as a reference. The influence of the type of adhesive and wood species as well as their interaction on the properties of plywood was significant. The lowest bonding strength demonstrated plywood samples bonded by LDPE, and the highest bonding strength in the samples was shown in those bonded by CoPA. A significant difference was found between softwoods and hardwoods in terms of their influence on the physical and mechanical properties of plywood samples. From the obtained data, it follows that softwoods provide much lower values of bending strength (MOR), modulus of elasticity (MOE), and bonding strength than hardwoods. The obtained bonding strength values of plastic-bonded plywood panels ranged from 1.18 to 2.51 MPa and met the European standard EN 314-2 for Class 1 (dry conditions) plywood.

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