Paper and process for manufacturing paper using microfibrillated cellulose between the layers thereof
A technology of microfibrillation, cellulose fibers, applied in the field of papermaking, which can solve problems such as the use of MFC that is not described
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0122] To generate CFM, bleached or unbleached kraft pulp with long and short fibers is used, which is diluted to 2% and treated with the chemical reagent Al 2 (SO4 ) 3 and NaOH to pH 6.0, followed by heating at 35°C-40°C for 50-60 minutes. Subsequently, the kraft pulp was treated with 125 g / ton of dry pulp endoglucanase for 25 minutes in a cowles shaker, and the pH was raised by using a dosage of about 200 g / ton of pulp with NaOH to 13-14 to stop the enzyme action. The treated pulp was passed through a first vertical mill containing conventional alumina stones without flutes and then through a second mill for 7 hours where the pulp was diluted again to a consistency of 0.8% , stirred with a non-cutting blade for 60 minutes, filtered through a 0.05mm filter and stored to supply the application line of the shower / spray nozzle.
Embodiment 2
[0124] MFC was applied between paper layers using a sprayer in the laboratory for physical and mechanical property testing. Use a constant spray air gun to create an application mist and spray it onto the paper surface. The air gun has a container in which the prepared MFC suspension is stored and when the container is pressurized by a mechanical trigger, the suspension will pass through an application needle having an opening between 0.5 and 10mm spraying. After passing through this opening, the suspension is sprayed onto the paper surface. The layer sprayed onto the paper surface was used to bond a further paper layer to the powder suspension and paper / substrate surface set. Two paper layers, possibly of different fiber composition, were bonded together by spraying the MFC suspension between the layers. MFC is generally sprayed in from 0.1% to 2% consistency.
Embodiment 3
[0126] For industrial applications, lasts about 2 hours on an MP14 industrial paper machine, and depending on the defined application load, can reduce the starch load for applications that bond between paper layers by a factor of about 5. As in the laboratory, the MFC slurry is prepared to a known consistency and stored in tanks with coupled pumps and directly connected to fans and conical starch sprayers between the paper layers in the MP14 paper machine / sprayer line. The suspension is pumped from the tank at a flow rate of 0 to 200 L / min to the applicator line where it is sprayed between the paper layers, resulting in orientation between the paper layers or only to one spray in layers, depending on the application angle ranging from 0 to 180° ( Figure 32 ). Application of the MFC suspension at maximum flow rate allowed the replacement of 100% of the starch between the layers previously used for the same purpose.
PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| diameter | aaaaa | aaaaa |
| viscosity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More