5-7 OCTOBERISFR2011

47

TOLEDO (SPAIN)

INFLUENCE OF CONTAINED ADHESIVES ON THE PYROLYSISCHARACTERISTICS OF WOOD BIOMASS
Yuji-Oshima, Mariko Adachi Shin Suzuki, Zar Zar Hlaing, Momoko Nagase, and Hideki Nakagome
Graduate School of Engineering, Chiba University, Chiba, Nakagome Laboraory
e-mail: oshima@graduate.chiba-u.jp

Abstract
In recent years the use of plywood and laminate lumber as construction material has been increasing rapidly. The wood
waste, containing synthetic polymer, such as adhesives, is expected to become a large quantity of material during thenext 15~20 years. Although the demand for quality waste wood is increasing, waste wood material mixed ith plastics orcontaining adhesives has low recycling value, and in most cases it is discarded. Therefore, it is necessary to develop
techniques for processing it effectively. One technique for creating gaseous and liquid fuel out of wood is pyrolysis. The
study investigated the outcome of pyrolysis in which synthetic polymers (plastics and adhesives) and wood biomass fromconstruction materials were mixed at temperatures ranging from 300°C to 500°C at standard pressure and in a nitrogen
atmosphere. Taking a compreg as samples, the pyrolysis characteristics of wood biomass mixed with synthetic polymer
were studied using a thermogravimetric analyser (TGA). In the TGA measurement, wood containing adhesives was foundto have a lower peak temperature of heat weight loss compared with wood not containing adhesives. It wasdemonstrated this experimental result is caused when the decomposition reaction of cellulose was influenced byadhesives.

Keywords: biomass, pyrolysis, compreg, adhesives, cellulose

1. Introduction
Japanese detached houses are mainly built of wood. At
present the majority of these buildings are demolishedand the plot redeveloped within 20-30 years. In recentyears, plywood and laminate lumber are more commonlyused than solid timber to build houses. This is because it
has become possible to employ plywood and laminate
lumber which is now produced strong enough to be usedas structural members requiring strength and durability,
for purposes such as pillars and beams, due to theimprovement of adhesive technology for woodenmaterials. The production of structural plywood has
increased about threefold in the last ten years and theproduction of laminate lumber has doubled. On the otherhand, particleboard is a structural element made of finely
crushed wood mixed with adhesives and then hardened.
It is often used in cheap furniture and for the flooring ofapartments. Among wooden boards, particleboard is themost widely produced. Particleboard is mostly made fromwood waste and can already be described as a recycledmaterial. In the future, further use of such recycledmaterial is projected. However, such material mixed withplastics (physically mixed or coated on the surface) andmaterial with adhesives (especially adhesives containingnitrogen) has low recycling value, so most of them arediscarded as final waste. It is therefore desirable todevelop techniques for processing the materials more
effectively. One of the techniques employed to
manufacture gaseous and liquid fuel from wood ispyrolysis. We conducted a pyrolysis experiment using
approximately 70kg of samples comprising particleboard.

2. Materials and Methods
The samples employed were Laminated Veneer Lumber
compreg (CPP) and material wood of compreg (CPR)and cellulose. The material wood of compreg was birch.
The veneer of the birch raw material was pasted up withphenol resin adhesive. The CPP included 30% of phenol
resin adhesive (PF). The composition of the CPP are
shown in Fig. 1. These samples were used after being
ground finely to 150μm diameter or less. The cellulose in
use was ppurchased from commercial chemical shop
Aldrich Chemie CAS No.90044-34-6).
(Sigma-Aldrich
No.9004-34-6).

Fig. 1 Structure of compreg

Fig. 2 A schematic diagram of the TGA

interiores libro.indd 47

26/9/11 13:12:47

5-7 OCTOBERISFR201147TOLEDO (SPAIN)

INFLUENCE OF CONTAINED ADHESIVES ON THE PYROLYSISCHARACTERISTICS OF WOOD BIOMASS
Yuji-Oshima, Mariko Adachi Shin Suzuki, Zar Zar Hlaing, Momoko Nagase, and Hideki Nakagome
Graduate School of Engineering, Chiba University, Chiba, Nakagome Laboraory
e-mail: oshima@graduate.chiba-u.jp

Abstract
In recent years the use of plywood and laminate lumber as construction material has been increasing rapidly. The wood
waste, containing synthetic polymer, such as adhesives, is expected to become a large quantity of material during thenext 15~20 years. Although the demand for quality waste wood is increasing, waste wood material mixed ith plastics orcontaining adhesives has low recycling value, and in most cases it is discarded. Therefore, it is necessary to develop
techniques for processing it effectively. One technique for creating gaseous and liquid fuel out of wood is pyrolysis. The
study investigated the outcome of pyrolysis in which synthetic polymers (plastics and adhesives) and wood biomass fromconstruction materials were mixed at temperatures ranging from 300°C to 500°C at standard pressure and in a nitrogen
atmosphere. Taking a compreg as samples, the pyrolysis characteristics of wood biomass mixed with synthetic polymer
were studied using a thermogravimetric analyser (TGA). In the TGA measurement, wood containing adhesives was foundto have a lower peak temperature of heat weight loss compared with wood not containing adhesives. It wasdemonstrated this experimental result is caused when the decomposition reaction of cellulose was influenced byadhesives.

Keywords: biomass, pyrolysis, compreg, adhesives, cellulose

1. Introduction
Japanese detached houses are mainly built of wood. Atpresent the majority of these buildings are demolishedand the plot redeveloped within 20-30 years. In recentyears, plywood and laminate lumber are more commonlyused than solid timber to build houses. This is because it
has become possible to employ plywood and laminate
lumber which is now produced strong enough to be usedas structural members requiring strength and durability,
for purposes such as pillars and beams, due to theimprovement of adhesive technology for woodenmaterials. The production of structural plywood has
increased about threefold in the last ten years and theproduction of laminate lumber has doubled. On the otherhand, particleboard is a structural element made of finely
crushed wood mixed with adhesives and then hardened.
It is often used in cheap furniture and for the flooring ofapartments. Among wooden boards, particleboard is themost widely produced. Particleboard is mostly made fromwood waste and can already be described as a recycledmaterial. In the future, further use of such recycledmaterial is projected. However, such material mixed withplastics (physically mixed or coated on the surface) andmaterial with adhesives (especially adhesives containingnitrogen) has low recycling value, so most of them arediscarded as final waste. It is therefore desirable todevelop techniques for processing the materials more
effectively. One of the techniques employed to
manufacture gaseous and liquid fuel from wood ispyrolysis. We conducted a pyrolysis experiment using
approximately 70kg of samples comprising particleboard.

2. Materials and Methods
The samples employed were Laminated Veneer Lumber
compreg (CPP) and material wood of compreg (CPR)and cellulose. The material wood of compreg was birch.
The veneer of the birch raw material was pasted up withphenol resin adhesive. The CPP included 30% of phenol
resin adhesive (PF). The composition of the CPP are
shown in Fig. 1. These samples were used after being
ground finely to 150μm diameter or less. The cellulose in
use was ppurchased from commercial chemical shop
Aldrich Chemie CAS No.90044-34-6).
(Sigma-Aldrich
No.9004-34-6).

Fig. 1 Structure of compreg

Fig. 2 A schematic diagram of the TGA

interiores libro.indd 47

26/9/11 13:12:47