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Bark as a Formaldehyde Scavenger

Bark is much underutilized material. The majority of bark is us as fuel and for landscaping there are still significant amounts of bark that remains unused, hence creating a problem when disposed. Due to dust like shape/size bark is not suitable or desired constituent for particleboard production. One of possible use of bark is related to its chemical compositions, namely due to the phenolic like components, bark can be used as formaldehyde scavenger. The aim of paper is to present the usability of bark dust and bark extract as particleboard formaldehyde scavenger. Pine (Pinus sp.) bark was chipped in laboratory conditions. For extraction hot water extraction was used. Bark dust was added to melamine-urea-formaldehyde resin and to particles prior to blending, while bark extract was sprayed over particles prior to blending. Hand formed mat was pressed at usual conditions (temperature 200° C, 3 N/mm2 pressure). The formaldehyde emission/content was determined by Perforator method (SIST EN 12460-5), by gas analysis (SIST EN 12460-3) and by Flask method (SIST EN 717-3). The experiment showed that addition of bark positively influences formaldehyde content/emission.

Pine bark ; Formaldehyde scavenger

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