Devices and systems for collapsible engagement mechanisms are described herein. In some examples, one or more embodiments include a front panel, a first side panel connected to the front panel, a second side panel connected to the front panel, and a collapsible portion connected to at least one of the first side panel and the second side panel, where the collapsible portion is collapsible about a hinge.

A cementitious composition comprises cement and crystalline cellulose or nanocrystalline cellulose formed from a cellulosic material by a redox reaction.

A cementitious composition comprises cement and crystalline cellulose or nanocrystalline cellulose formed from a cellulosic material by a redox reaction.

The present invention provides an enzymatic method for reducing the content of hexenuronic acids in a chemical cellulosic pulp and/or improvement of the brightness of cellulosic pulp using haloperoxidase.

The present invention provides an enzymatic method for reducing the content of hexenuronic acids in a chemical cellulosic pulp and/or improvement of the brightness of cellulosic pulp using haloperoxidase.

A bleaching apparatus comprises a measurement chamber has a first substance, the amount of the first substance in the measurement chamber being known. A dosing unit inputs a second substance to the measurement chamber for causing a chemical reaction between the first substance and the second substance, one of the first substance and the second substance being chlorine dioxide and another of the first substance and the second substance being filtered sample from pulp slurry of a pulp process. At least one sensor performs detection of a property known to depend on the chemical reaction between the first substance and the second substance as a function of time. A data processing unit determines chemical demand of chlorine dioxide for washing loss in a bleaching sub-process on the basis of at least one value in the detected property within a known period of time after the input of the second substance.

A cementitious composition comprises cement and crystalline cellulose or nanocrystalline cellulose formed from a cellulosic material by a redox reaction.

A cementitious composition comprises cement and crystalline cellulose or nanocrystalline cellulose formed from a cellulosic material by a redox reaction.

According to an example aspect of the present invention, there is provided a multilayered fibrous sheet, such as paperboard, having a first layer comprising a first fibrous material, a second layer, spaced apart from the first layer, comprising a second fibrous material, and a third layer between the first and the second layers, comprising a third fibrous material, wherein at least one of the first and the second fibrous materials comprises or consists of a mixture of chemical pulp and mechanical pulp; and the third fibrous material comprises or consists of mechanical pulp.

According to an example aspect of the present invention, there is provided a multilayered fibrous sheet, such as paperboard, having a first layer comprising a first fibrous material, a second layer, spaced apart from the first layer, comprising a second fibrous material, and a third layer between the first and the second layers, comprising a third fibrous material, wherein at least one of the first and the second fibrous materials comprises or consists of a mixture of chemical pulp and mechanical pulp; and the third fibrous material comprises or consists of mechanical pulp.