Plywood Production Research Articles

Justification of the Manufacturing Plywood Technology on Dry Glues

The use of environmentally safe technologies in the plywood production encourages the use of dry powder mixtures of polyester resin used for gluing veneer. The work presents the results of studies of some characteristics for plywood, which was product on the basis of polyester resin. As a result of experimental studies, the expediency of manufacturing plywood on dry adhesive mixtures of polyester resins has been substantiated. Since the limit of static bending strength along the fibers of the plywood face layers exceeds the standard value. The resistance to chipping on the glued layer of plywood also did not decrease and exceeds the standard value both after dry exposure and after soaking. The studied plywood is characterized by reduced moisture absorption properties. This is due to the thermal modification of the veneer. It was established that with an increase in the modification temperature to , moisture absorption decreases by more than 3.5 %. Thus, the obtained research results allow us to purposefully solve further problems related to the creation of new technologies for the wood products manufacture and to determine the conditions of their operation at various facilities.

Bonding wood with uncondensed lignins as adhesives

Plywood is widely used in construction, such as for flooring and interior walls, as well as in the manufacture of household items such as furniture and cabinets. Such items are made of wood veneers that are bonded together with adhesives such as urea–formaldehyde and phenol–formaldehyde resins1,2. Researchers in academia and industry have long aimed to synthesize lignin–phenol–formaldehyde resin adhesives using biomass-derived lignin, a phenolic polymer that can be used to substitute the petroleum-derived phenol3–6. However, lignin–phenol–formaldehyde resin adhesives are less attractive to plywood manufacturers than urea–formaldehyde and phenol–formaldehyde resins owing to their appearance and cost. Here we report a simple and practical strategy for preparing lignin-based wood adhesives from lignocellulosic biomass. Our strategy involves separation of uncondensed or slightly condensed lignins from biomass followed by direct application of a suspension of the lignin and water as an adhesive on wood veneers. Plywood products with superior performances could be prepared with such lignin adhesives at a wide range of hot-pressing temperatures, enabling the use of these adhesives as promising alternatives to traditional wood adhesives in different market segments. Mechanistic studies indicate that the adhesion mechanism of such lignin adhesives may involve softening of lignin by water, filling of vessels with softened lignin and crosslinking of lignins in adhesives with those in the cell wall.

Rheological Properties of Wood Plastic Composites Based on Polypropylene and Birch Plywood Residues - Sanding Dust

This article summarizes the investigation results of the rheological and thermal stability properties of industrially prepared wood plastic composites based on virgin polypropylene (PP) and birch plywood production waste product, plywood sanding dust (PSD). Wood plastic composites (WPCs) PP+40 wt.% PSD contain different modifiers, such as functional lubricant Struktol TWP, antioxidant 1010, thermal stabilizer 168, ultraviolet (UV) stabilizer 770, and pigment concentrate based on low density polyethylene (LDPE). According to these studies, it was concluded that rheological properties studied by the capillary rheometry method depend on WPC composition and the parameters of rheological measurements. On the contrary, melt flow index (MFI) values did not change so much and fluctuated in the range of 1.52–1.66 g/10 min. The presence of thermal and antioxidant stabilizers promoted an increase in the thermal stability of WPCs, as determined by the thermal gravimetric analysis (TGA) method. The characteristics of fluidity curves indicated the character of typical pseudo-plastic liquids, in which viscosity not only depends on temperature, shear stress, and shear deformation rate but also decreases with an increase in shear deformation rate. That also confirmed the values of the fluidity index (n), which for pseudo-plastic polymer melts are always smaller than 1.

PLATech overview -radiation-heat tailored VOC-free, bio-renewable polylactic acid polymer formulations & methods for multiple industrial adhesion applications

This paper presents an overview of research and results about tailoring crystalline and amorphous form polylactic acid (PLA) polymer resin for use as an adhesive for joining a range of substrates, production of wood-based composites plywood and particle wood-based composites, and, for potential use for elevated temperature applications as for wood structures when subject to fires. The range of substrates successfully joined (with and without bio-plasticizer) ranges from metals, woods, glasses, ceramics, stones, and bricks to synthetic fluoro-polymers. Tensile bond strength for steel-to-steel bonding ranged towards 40+ MPa; superior (over 100%) bonding strength was obtained compared with EVA and other standard adhesives for wood and metal surfaces. Three successful industrial product arenas are described: 3-ply composite plywood panels meeting water soak and shear strength industry metrics; particle boards meeting-exceeding rupture strength, elasticity, and water resistance metrics similar to those expected from urea-formaldehyde based adhesive but without VOC release limitation, PVC-free luxury flooring tiles which meet strict requirements for wear cycles, distortion-free adhesion peel strength; and, production of renewable particle boards with elastic modulus and internal bond strengths comparable with boards made with urea formaldehyde. Thermal and gamma ionizing radiation research results are discussed to tailor key adhesive-relation properties: adhesion strength, viscosity, flow rate, molecular weight, hardness, flexibility, and friability. Scoping studies on radiation-based tailoring with a cross-linking agent were found to permit up to 30% improvements in bond strength as well as for enabling application as an adhesive for elevated (100 °C+) temperature applications with ∼30–50% higher operating temperatures compared with commonly used adhesives. A discussion is included about the remaining challenges and recommendations for further research.

Influence of the use of chestnut starch as a binder filler in plywood technology

: Influence of the use of chestnut starch as a binder filler in plywood technology. Fillers play a crucial role in the production of plywood glues, providing enhanced performance and stability to the end product. Plywood, being a composite material, requires fillers to improve its mechanical properties, adhesion, and overall quality. One common filler used in plywood glues is calcium carbonate. It acts as a bulking agent, increasing the volume and density of the adhesive mixture while reducing production costs. Calcium carbonate also enhances the glue's viscosity, ensuring proper bonding and uniform application during the plywood manufacturing process. Another widely used filler is rye or wheat flour, which consists of finely ground grains. The flour not only improves the adhesive's viscosity but also contributes to the overall strength and stability of the plywood. It helps to prevent warping and enhances dimensional stability, making the final product more durable. Additionally, other fillers like talc or clay minerals may be incorporated into the glues to improve their adhesive properties and increase moisture resistance. Chestnut starch is a type of vegetable flour made by grinding edible chestnuts into a powder. It has a different texture and properties than traditional wheat or rye flour. When used as a binder filler in plywood technology, it can be biodegradable and environment-friendly. In the study, there were produced five types of plywood with 0, 1, 5, 10, and 20 parts by weight chestnut flour and one reference. All samples were produced in laboratory conditions and the selected mechanical and physical properties of the produced boards were studied. The mechanical properties of the boards increased with the addition of chestnut flour. In some tests, the results even met the highest requirements of European standards for plywood. According to this finding, a well-chosen addition of chestnut flour could be positively considered in plywood production.

Evaluasi Sistem Pengelolaan Limbah B3 PT Y

Increasing the standard of living and social welfare can be marked by industrialization. Increasing industrialization has had an impact on environmental pollution caused by waste, one of which is B3 waste. PT Y is a processing industry company engaged in the production of plywood. In its production process PT Y produces B3 waste which must be managed according to the characteristics and nature of the B3 waste. B3 waste that is not managed properly will cause pollution and cause problems around it. This study aims to analyze the existing conditions regarding the management of hazardous and toxic waste (B3) from PT Y, evaluate and provide recommendations based on applicable regulations. Evaluation is carried out using the Guttman scale method to compare existing conditions with applicable regulations. The evaluation result of PT Y's B3 waste management is 66% in the "Good" category. Based on the evaluation results, recommendations are obtained that can improve the B3 waste management system to be better and in accordance with the standardsrules that happened.

Development of plywood bonded with a novel adhesive film made from polystyrene foam waste dissolved in D-limonene

ABSTRACT The polystyrene film as a formaldehyde-free adhesive for plywood production was developed from polystyrene foam waste (PSF) and D-limonene, extracted from orange peel waste. The influence of the weight ratio of solvent (D-limonene) to foam in the range of 1, 1.5 and 2 (w/w) on the properties of adhesive film and plywood panels was studied. In addition, the effects of pressing temperatures of 150°C, 165°C and 180°C on the properties of the plywood were investigated. The adhesive film was characterized by measuring the melt flow index, the average molecular weight of the polymers and by FTIR. The bonding quality of the adhesive films was investigated by shear strength tests. Integrated gel permeation chromatography has also shown that the average molecular weight of PSF is drastically reduced by doubling the solvent content. Shear strength and bending properties were also significantly reduced by doubling the weight ratio of solvent to foam. The mechanical properties of plywood are positively affected with increasing press temperature to 165°C. In general, plywood bonded with an adhesive film prepared with a solvent to foam weight ratio of 1 and press temperature of 165°C was fulfilled the requirement according to EN314-2 for interior use.

Strategic Policy Model for Management of Plywood Industry Using System Dynamic Methods

Purpose: This study aims to obtain a strategic model for the arrangement of the Indonesian plywood industry after the monetary crisis with high uncertainty. Theoretical framework: This study discusses several theoretical frameworks which include Strategic Policy, Plywood Industry, and System Dynamic Modeling. Design/methodology/approach: This study was conducted covering the stages of collecting data and information, as well as the stages of Dynamic System Modeling. Findings: The result of the study is the preparation of dynamic systems through formulation into dynamic sub-models, namely: plywood industrial production, sawn timber industry, chip mill industrial production, log raw material production for the wood industry, log economic contribution to the center and the region, illegal export logs, domestic and exports of the wood industry as well as financial feasibility of the plywood industry. Research, Practical & Social implications: The results of the study are useful for decision makers in Plywood Industry Management on work culture of Indonesia fabricaton because they show that the proposed practices have an important impact on organizational company excellence. Originality/value: The policies carried out in the plywood industry structuring strategy include a national plywood production limitation policy, a national sawn wood production limitation policy, and a cutting restriction policy in the form of the Annual Allowable Cutting in various combinations which are outlined in eight main policies scenarios and translated into 28 scenarios.

Risk prevention of plywood product defects using Failure Mode Effect Analysis (FMEA) in the Indonesian plywood processing industry

ABSTRACT This case study aims to determine factors that cause defects in plywood products using failure mode effect analysis (FMEA) parameters. It also analyzes prevention strategies against plywood product defects in the plywood industry in Indonesia. The study involved 9 participants who are employees of different divisions. The research data were collected from direct observations of the plywood production process, analysis of documents recording plywood product defects, and focus group discussions. Based on the results of thematic analysis using FMEA parameters, this study identified five factors that significantly contribute to the failure of plywood products, as indicated by their highest Risk Priority Number (RPN) values. These factors are: (1) lack of employee discipline, (2) unstable machine temperature and excessive machine capacity usage, (3) waste on the veneer surface, (4) excessive adhesive wastage, and (5) inefficient work performance of the employees. The study suggests that the FMEA concept employed to capture product defects can potentially be used to explore employees’ perspectives and their lived experiences in plywood production. In addition, FMEA can provide improvement feedback to prevent defects in plywood products.

Environmental and Energy Efficiency of Plywood Production Waste Burning

A comprehensive assessment of the energy and environmental efficiency of using plywood production waste as an energy fuel in steam watertube boilers units with a staged combustion scheme has been carried out. The components of the heat balance and emission of harmful substances are determined. The thermal engineering and granulometric characteristics, as well as the elemental composition of the combustible fuel and the formed focal residues, have been studied. Specific surfaces, porosity of entrainment particles were determined and their microscopic studies were performed. Specific surfaces, porosity of entrainment particles were determined and their microscopic studies were performed. It is concluded that it is necessary to modernize the ash cleaning system, and in the future to reconstruct boilers with the installation of tilt-pushing grids when implementing a layer-vortex combustion scheme.

Effects of wood dyestuff on the bonding properties of soybean-based adhesive for commercial plywood production

The two main components of commercial soybean-based adhesives (SA), polyamidoamine-epichlorohydrin (PAE) resin and soybean protein, are extremely ion-sensitive. When SA is used to bond dyed wood substance and/or mix with anion dyes for labelling wood composites during commercial manufacturing, the regularly used anion dyes in the wood industry may produce significant differences in the bonding capabilities of SA. In the current study, three common tricolor anion dyes in the wood industry were chosen to evaluate their impacts on the structures and properties of soybean protein, PAE resin, and PAE-modified SA, respectively. Analytical data from FTIR, XRD, TGA, NMR, sol-gel test, and plywood evaluation indicated that dye ions had varying effects on the bonding properties of SAs. The addition of chosen red and yellow dyes to SAs enhanced plywood cycling wet strengths by 41.7–42.8%, whereas the blue dye had little impact. The promoter interactions of red- and yellow-dye ions on the unfolding of globular structures of soybean protein, the self-crosslinking of PAE resin, and the sufficient co-crosslinking of soybean protein by PAE resin all contributed to the formation of compact three-dimensional networks of cured SAs. As a result, this work illuminates a novel method for conveniently improving the bonding capabilities of SAs by adding appropriate dyes.

Lignocelluloses-Based Furan-Acetone Adducts as Wood Adhesives for Plywood Production.

Plywood is made of wood veneers that are bonded with adhesives such as urea-formaldehyde, phenol-formaldehyde and melamine-formaldehyde resins. The plywood made from formaldehyde-based adhesives not only releases formaldehyde but also relies on fossil resources. In this article, we synthesized furan-acetone adducts from lignocellulosic biomass in one pot. The furan-acetone adducts could be directly used as adhesives with the addition of phosphoric acid as a curing catalyst. Particularly, with the addition of 5 wt% diphenylmethane diisocyanate (MDI) as a crosslinking agent, both the wet and dry bonding strength of the plywood prepared from the adhesives could meet the minimum requirement of 0.7 MPa (Chinese National Standard GB/T 9846-2015). The possible adhesion mechanism is that the penetration of furan-acetone adhesives into vessels and cell lumens followed by crosslinking during hot-pressing forms mechanical interlocking at the interface of wood veneers, which provides the main bonding strength of plywood. The findings presented here could provide a new way for the efficient preparation of aldehyde-free green wood adhesives and the value-added utilization of woody biomass.

Development of Mineral-Bonded Plywood with Magnesium Oxychloride as a Binder Using the Hot-Pressing Process.

Environmentally friendly plywood panels were produced by a hot-pressing process using magnesium oxychloride cement (MOC) as a no-added formaldehyde adhesive. Magnesium oxychloride cement binders were prepared with different molar ratios of MgO:MgCl2 (M/C) and H2O:MgCl2 (W/C) ranging from 6 to 12 and 15 to 21, respectively, for plywood production. The binder properties measured were gel time, differential scanning calorimetry (DSC) and Fourier transom infrared spectroscopy (FTIR). The quality of the plywood panels was analyzed based on their mechanical (shear and bending) and physical (thickness swelling and water absorption) properties. A positive effect on the properties of the MOC binder as well as on the properties of the plywood was observed by increasing the molar ratio M/C up to a value of 9. The shear and flexural properties of the plywood specimens were negatively affected by further increasing the molar ratio M/C to 12 and the molar ratio W/C from 15 to 21. Differential scanning calorimetry analysis showed a peak temperature of less than 100 °C for MOC curing, which meets the requirements of hot press technology. No delamination of the plywood specimens was observed after 24 h immersion in tap water or 6 h immersion in boiling water and after a cyclic delamination test. In general, mineral-bonded plywood with magnesium oxychloride shows promising properties for indoor and outdoor use, although the binder quality should still be improved.

A ANALISIS DEFECT PADA PROSES PEMBUATAN KAYU LAPIS DENGAN METODE STATISTICAL PROCESS CONTROL (SPC) DAN ROOT CAUSE ANALYSIS (RCA)

As a society, we need good products, both producers who sell and consumers who buy want their products to be of the expected quality. Conversely, if the quality of the product is not good, it will harm many parties and the bad impact received will not be small. That's why consumer satisfaction is very influential for the company, where consumers can make an assessment and grow confidence in a product that is produced especially plywood products. This study aims to determine the type of defect and its control using the Statistical Process Control (SPC) method. Statistical process control is a decision-making method for monitoring, controlling, analyzing, managing, and improving products and processes using statistical methods with the aid of histograms, Pareto charts, control charts, and fishbone diagrams. Based on the Pareto diagram, the most common product defects are over-sanding defects with a percentage of 46%, followed by under-size defects at 29.6%, and delamination at 24.4%. The main cause of defects in plywood products is the human factor because the operator is new to machine understanding and lacks training, the machine factor is caused by too many targets and a lack of human resources, and the method factor is due to the operator's lack of knowledge about sandpaper

Influence of Upcycled Post-Treatment Bark Biomass Addition to the Binder on Produced Plywood Properties

The valorization of tree bark through chemical treatment into valuable products, such as bark acid, leads to the formation of process residues with a high solids content. Since they are of natural origin and are able to be suspended in water and acid, research was carried out on the recycling of suberic acid residues (SAR) as a bi-functional component of binder mixtures in the production of plywood. The 5%–20% (5%–30% for curing time) mass content of SAR has been investigated with urea-formaldehyde (UF) resin of about 66% of dry content. The results show that the curing time of the bonding mixture can be reduced to about 38% and 10%, respectively, for hot and cold curing, of the initial curing time for the lowest SAR content. The decreasing curing time of the tested binder mixtures with the increase in SAR content was caused by the increasing amount of acidic filler, since amine resins as UF require acidification hardening, and the curing dynamics are strongly dependent, among others, on the content of the acid medium (curing agent). In the case of hot curing, a SAR content of about 20% allowed us to achieve the curing time of bonding mass with an industrial hardener. Investigations into the mechanical properties of examined panels showed a significant modulus of elasticity (MOE) increase with filler content increase. Similar conclusions can be drawn when analyzing the results of the modulus of rupture (MOR) investigations; however, these were only significant regarding hot-pressed samples. The shear strength of the plywood samples increased with the SAR rise for both cold- and hot-pressed panels. The in-wood damage of samples with SAR filler, hot-pressed, rose up to about 30% for the highest SAR filler content. For cold-pressed samples, no in-wood damage was found. The positive effect of veneer impregnation limiter by resin was identified for SAR acting as a filler. Moreover, a higher density of SAR-containing bonding lines was reached for hot-pressed panels. Therefore, the results confirmed the ability to use the SAR as an upcycled component of the bonding mixture for plywood production.

ТЕХНОЛОГИЧЕСКИЙ ПРОЦЕСС ПОЛУЧЕНИЯ ЛУЩЕНОГО ШПОНА: ВЛИЯНИЕ ВНЕШНИХ ТЕМПЕРАТУРНЫХ УСЛОВИЙ НА ОТТАИВАНИЕ И ПРОГРЕВ ДРЕВЕСИНЫ

To obtain high-quality peeled veneer, heating of wood is a mandatory technological operation. In winter, it is necessary to first thaw, and then warm up the wood to a certain temperature on the surface of the pencil. The operation of thawing and warming up is performed in open or closed water pools. One of the main factors of this technological operation is their duration. The available calculation formulas for employees of plywood enterprises are quite complex, since a number of values are selected from a large number of literary sources, and in the future, a number of parameters are calculated that determine the duration of thawing and heating of wood. In recent years, enterprises, in order to intensify the process of heating wood, are switching from open to closed pools. The results of the continuation of the TRP of wood in a closed water basin presented in the work will allow specialists to determine the desired time parameters without additional calculations. The results obtained showed that the determining factors for the duration of the TRP of wood in the production of plywood are not only the temperature of the air and the temperature of the water in the pool, but also the density of wood. Thus, for denser types of wood (birch, larch) used in the production of plywood, more time is required for thawing and heating. Moreover, the main heating of wood occurs at a pool water temperature of 60 °C, when thawing of wood occurs. After that, the duration of heating the wood to a temperature of 20 °C on the surface of the pencil is significantly reduced, especially at a pool water temperature of 80 °C.

Design and Development of Composite Plywood that Integrates Fire Resistance, Water Resistance and Wear Resistance

In order to improve the fire resistance, water resistance and wear resistance of ordinary plywood products in the wood processing industry, three composite structures of plywood products S1, S2 and S3 were designed in this paper, and a reasonable production process was proposed. Through the physical and mechanical properties and fire resistance testing and technical and economic analysis, the applicability of composite plywood was evaluated. The results of the study showed that the physical mechanics of the three kinds of composite structure plywood met the standard requirements, and their fire resistance was far better than that of ordinary plywood. Among them, the S1 structural board had the best overall physical and mechanical properties. The S3 structural board showed the best fire resistance, which was about 1.9 times more than that of ordinary plywood, and the added cost was the lowest. The thin cork board added to the S2 structural board had poor fire performance since the air in the cork board cavities had a certain combustion-supporting effect, which inhibited the fire resistance of high-pressure laminate (HPL) layer. Moreover, the additional cost of the S2 board was the highest, and its comprehensive performance was the worst. The S3 structural plywood product composed of HPL fireproof board with a thickness of about 1 mm in the surface layer and ordinary plywood with a thickness of about 12 mm in the core layer was the most cost-effective product, which could meet the needs of various fields such as construction, home furnishing, decoration and transportation.

Preparation of bisDOPO-NH2-POSS flame retardant and its application to plywood using modified urea-formaldehyde resin

ABSTRACT A new type of polyhedral oligomeric silsesquioxanes bisDOPO-NH2-POSS flame retardant consisting of one polyhedral oligomeric silsesquioxane (POSS), two units of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and reactive –NH2 groups, was synthesized and characterized by FTIR, 1H NMR, and 31P NMR. It was applied to modified conventional environmentally friendly E0 grade urea formaldehyde (UF) resin to prepare flame-retardant plywood. Two other POSS structure flame retardants were used for comparison. The results showed that the addition of bisDOPO-NH2-POSS flame retardant to E0 UF resin improved bonding strength while lowering formaldehyde emission owing to the increase in cross-linking of the UF molecule chain in condensation. TGA curves showed that bisDOPO-NH2-POSS-E0 UF exhibited the highest thermal stability. The flammability characteristics of the plywood were evaluated by a cone calorimeter test (CCT), and the results indicated that the heat release and smoke production of flame-retardant plywood were lower than those of the control E0-UF plywood. Moreover, compared to E0-UF plywood, the char residue remaining after the CCT test of the flame-retardant plywood with POSS structure increased. In particular, bisDOPO-NH2-POSS-E0-plywood had a continual compact outer carbon layer, which was conducive to effectively forming a physical barrier to hinder the penetration of oxygen and heat and exhibiting the outstanding synergistic effect of phosphorous, silicon and nitrogen.

Beyond ecodesign, internationalized markets enhance the global warming potential in the wood furniture sector

Circular Economy principles encourage the implementation of bio-based and renewable materials over non-renewable technical counterparts. Wood-based materials can effectively address finite resource depletion and the accumulation of non-biodegradable waste into terrestrial and marine environments. In this context, the furniture industry has long relied on the use of wood for manufacture goods. However, the use of renewable materials is not directly translated into sustainable consumer goods. Accordingly, this work analyzes the life cycle environmental impacts of an eco-designed and locally-manufactured wooden bunk bed and compares local and international market scenarios to understand its cradle-to-grave environmental footprint. Using primary data, the life cycle assessment (LCA) methodology is followed to quantify and compare the environmental impacts of a currently commercially available wooden bunk bed over alternative scenarios. To facilitate future comparison, 1 kg of furniture is used as a functional unit. The cradle-to-grave system boundaries are established according to the reference “Furniture, except seats and mattresses” Product Category Rule. The upstream, core and downstream life-cycle stages are considered, and the environmental impacts are presented into eight different categories. To provide the bigger picture, obtained results are compared with literature. A cradle-to-grave CO2-eq footprint of 1.71 kg per kg of an already eco-designed bunk bed is obtained, 15.1% below average traditional furniture. The downstream stage contributes to the 58.3% of the total greenhouse gas emissions, while the upstream and core phases present a share of 26.2% and 15.5%, respectively. Such a large contribution of the downstream phase originates from the transportation to the final customer (82.6% of this phase). For upstream and core phases, plywood production (53.1% share during the upstream) and electricity consumption (75.1% share during the core) are the main hotspots. Furthermore, this work quantifies the global warming potential of current internationalized wood furniture markets. Local furniture sale can reduce the CO2 emissions of the wooden bunk bed by 40%. Instead, selling the bed abroad involves a CO2 emission increase of 59%, while raw material importation enhances the impacts by 39–45%. The adoption of local production and consumption patterns emerge the most effective measures to reduce the environmental impacts of the furniture industry as the purchase of an overseas manufactured wood bunk increases the emissions by 79%. This research aims not only to bring light in the scientific community in LCA calculations but also help producers and consumers in the transition towards more sustainable consumption and production patterns in the wooden furniture market.

Rheological, Thermal and Mechanical Properties of Wood Plastic Composites (WPCs) Based on Virgin and Recycled Polypropylenes and Birch Plywood Waste

Article summarizes investigation results of rheological, thermal and some mechanical properties of industrially prepared wood plastic composites (WPCs), based on virgin and recycled polypropylenes (vPP, rPP) and birch plywood production waste product-plywood sanding dust (PSD). Investigated WPCs contain 40 and 50 wt. % PSD different another modifier, such as functional lubricant Struktol TWP-113, antioxidant 1010, thermal stabilizer 168, UV stabilizer 770 and different color pigments. According to our studies, we can conclude that rheological properties studied by capillary rheometry method depends on WPCs composition and experimental parameters: shear stress, shear deformation rate and temperature. The curves of the fluidity indicate to the character of typical pseudo-plasticity of all polymer melts of which viscosity not only depends on temperature, but also decreases with an increase of shear stress and shear deformation rate Pseudo-plastic properties confirm also the signed values of fluidity index (n) which for pseudo-plastic liquids always are smaller than one. TGA measurements showed that all systems have the high thermal stability and the weight losses after dynamic heating up to processing temperature 215°C are not more than 5.53 %, but during isothermal heating (1 h) at 215°C only 4.51%. Differential scanning calorimetry (DSC) showed a small changes of melting temperatures, but the beginning of thermal destruction temperature fluctuates between 256.96 and 188.5°C. Density of all composites changes in limits 1.02-1.09 g/cm3, temperaturesby Vika 154.4-158.7°C, microhardness 125.1-151.8 MPa and impact strength 7.81-15.39 kJ/m2