BARRIER BOARD AND A METHOD TO PRODUCE IT
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United States of America
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Issued Date -
Nov 28, 2024
app pub date -
Nov 3, 2022
filing date -
Nov 3, 2022
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Abstract
A barrier board has a first layer and is intended for foodstuff packaging material. The main raw material of the first layer is chemical pulp, the SR grinding value of which is over 50 and the weight per square meter is over 90 g. One application is where there are at least two layers and the main raw material of the first layer is chemical pulp, the grinding SR value of the chemical pulp is over 50 and the main raw material of the second layer is chemical pulp, mechanical pulp, CTMP mass or semi-chemical pulp. When the raw material is chemical pulp, its grinding SR value is over 35. If the raw material condition is fulfilled the grinding SR values of the first layer and the second layer are the other way around than what has been defined before.
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