Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing
This research optimizes the process of plywood production to determine its effectiveness in reducing energy and adhesive consumption for more efficient production with the required quality. The influence of selected parameters including veneer treatment (non-densified and densified), plywood structu...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-05-01
|
| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/12/5/1035 |
| _version_ | 1797569014186115072 |
|---|---|
| author | Pavlo Bekhta Ján Sedliačik Nataliya Bekhta |
| author_facet | Pavlo Bekhta Ján Sedliačik Nataliya Bekhta |
| author_sort | Pavlo Bekhta |
| collection | DOAJ |
| description | This research optimizes the process of plywood production to determine its effectiveness in reducing energy and adhesive consumption for more efficient production with the required quality. The influence of selected parameters including veneer treatment (non-densified and densified), plywood structure, temperature, time and pressure of pressing, on the bonding quality and temperature evolution within the veneer stacks during hot pressing was investigated. Rotary-cut, non-densified and densified birch veneers and phenol formaldehyde (PF) adhesive were used to manufacture plywood samples. The effect of pressure and time of pressing on bonding quality of the plywood was determined. Bonding quality was evaluated by determining the shear strength of the plywood samples. The temperature evolution inside the veneer stacks was measured for birch veneers for different pressing temperatures and pressures for different numbers of veneer layers. The heating rate of the veneer stacks increased as the pressing temperature increased and decreased markedly with an increasing number of veneer layers. At a high pressing pressure, the heating rate of the densified veneer stacks was faster than that of non-densified veneers at the same pressure. The use of densified veneers for the production of plywood can lead to a shorter pressing time (17–50% reduction), lower glue consumption (33.3% reduction) and a lower pressing pressure (22.2% reduction) without negatively impacting the bonding strength of the plywood. |
| first_indexed | 2024-03-10T20:04:56Z |
| format | Article |
| id | doaj.art-d895f7aa0d2e4aae8ba9f4be061ec1a9 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T20:04:56Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-d895f7aa0d2e4aae8ba9f4be061ec1a92023-11-19T23:20:56ZengMDPI AGPolymers2073-43602020-05-01125103510.3390/polym12051035Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During PressingPavlo Bekhta0Ján Sedliačik1Nataliya Bekhta2Institute of Woodworking and Computer Technologies and Design, Ukrainian National Forestry University, 79057 Lviv, UkraineFaculty of Wood Sciences and Technology, Technical University in Zvolen, 960 01 Zvolen, SlovakiaInstitute of Woodworking and Computer Technologies and Design, Ukrainian National Forestry University, 79057 Lviv, UkraineThis research optimizes the process of plywood production to determine its effectiveness in reducing energy and adhesive consumption for more efficient production with the required quality. The influence of selected parameters including veneer treatment (non-densified and densified), plywood structure, temperature, time and pressure of pressing, on the bonding quality and temperature evolution within the veneer stacks during hot pressing was investigated. Rotary-cut, non-densified and densified birch veneers and phenol formaldehyde (PF) adhesive were used to manufacture plywood samples. The effect of pressure and time of pressing on bonding quality of the plywood was determined. Bonding quality was evaluated by determining the shear strength of the plywood samples. The temperature evolution inside the veneer stacks was measured for birch veneers for different pressing temperatures and pressures for different numbers of veneer layers. The heating rate of the veneer stacks increased as the pressing temperature increased and decreased markedly with an increasing number of veneer layers. At a high pressing pressure, the heating rate of the densified veneer stacks was faster than that of non-densified veneers at the same pressure. The use of densified veneers for the production of plywood can lead to a shorter pressing time (17–50% reduction), lower glue consumption (33.3% reduction) and a lower pressing pressure (22.2% reduction) without negatively impacting the bonding strength of the plywood.https://www.mdpi.com/2073-4360/12/5/1035plywooddensificationcore layer temperaturebonding qualityhot pressingveneer stack heating |
| spellingShingle | Pavlo Bekhta Ján Sedliačik Nataliya Bekhta Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing Polymers plywood densification core layer temperature bonding quality hot pressing veneer stack heating |
| title | Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing |
| title_full | Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing |
| title_fullStr | Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing |
| title_full_unstemmed | Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing |
| title_short | Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing |
| title_sort | effects of selected parameters on the bonding quality and temperature evolution inside plywood during pressing |
| topic | plywood densification core layer temperature bonding quality hot pressing veneer stack heating |
| url | https://www.mdpi.com/2073-4360/12/5/1035 |
| work_keys_str_mv | AT pavlobekhta effectsofselectedparametersonthebondingqualityandtemperatureevolutioninsideplywoodduringpressing AT jansedliacik effectsofselectedparametersonthebondingqualityandtemperatureevolutioninsideplywoodduringpressing AT nataliyabekhta effectsofselectedparametersonthebondingqualityandtemperatureevolutioninsideplywoodduringpressing |