Equipment Description:Chip Screening
Click here to print the FactSheet on A4 paper
A Chip Screen is designed to remove any chips that are oversize and reduce the fine fraction (undersize) going forward to the cooking process. A uniform chip size is necessary to produce a good quality and homogenous pulp so efficient chip screening is required. The oversize chips and fine fraction are collected separately and can be dealt with differently in the system. |
Chipper The machine that produces the chips CookingThe process that breaks down the lignin bonds in the chips fines The small pieces of wood generated by the chipping and transporting processes |
 Image courtesy of Metso |
The Chip screen generally is made up of a number of vibrating screen plates used to classify the chips. The chips are fed onto the primary screen plate evenly and chips under the maximum limit pass through to the second stage. The oversize chips stay above the plate and are rejected for further processing. The accepted chips that passed through the plate then pass through further plates of smaller hole size until only the fines and undersize chips pass through into the reject area. There are a number of designs available with varying numbers of classification stages. As well as the screen plate type of screen there is also a roller style machine that classifies chips based mainly on thickness rather than length. Both variables affect the effectiveness of the cooking process and it is generally accepted that an efficient chipper is key to reducing the load on chip screening and the associated processes. |
Chip Screening was also mentioned in the following Fact Sheets (14):
|
These 0 companies are suppliers of relevant
equipment/services. There are 0 other potential suppliers of relevant equipment/services. (This information is from suppliers listed in the Industry Directory Contact PITA to have your company listed here) |