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A method for the production of a film comprising microfibrillated cellulose, a film and a paper or paperboard product

A technology of microfibrillation and microfibrils, which is applied in the direction of post-treatment modification of cellulose pulp, layered products, textiles and papermaking, etc., can solve the problems of slow efficiency and so on

Active Publication Date: 2019-05-03
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is too slow and inefficient for commercial-scale preparation

Method used

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  • A method for the production of a film comprising microfibrillated cellulose, a film and a paper or paperboard product
  • A method for the production of a film comprising microfibrillated cellulose, a film and a paper or paperboard product
  • A method for the production of a film comprising microfibrillated cellulose, a film and a paper or paperboard product

Examples

Experimental program
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Effect test

Embodiment 1

[0048] figure 1 A schematic diagram of the method according to the invention is shown.

[0049] The drying device (1) according to one embodiment of the invention comprises an impingement hood (2) to which hot air (3) is added. The hot air is then blown out through multiple nozzles (4) at a certain temperature and speed. The drying device (1) also comprises a carrier (5) in the form of a heated plate and the fibrous web (6) is guided through the drying device on the plate to blow hot air onto the fibrous web to form the MFC film.

Embodiment 2

[0051] The drying rate at different temperatures of the air blown onto the fibrous web in the drying plant was investigated.

[0052] A fiber suspension comprising 70% by weight of MFC based on total dry weight was cast onto a metal belt at a solids content of 4%. The metal strip is heated to a specific temperature before casting, a strip of 110°C means that the temperature of the metal strip at the end of drying is 110°C. The same applies to the samples with 120°C and with 130°C, respectively. The MFC films at 110°C, 120°C and 130°C were only dried by the heated metal melt and could be used as reference samples. The cast web was then dried until it was readily peelable, with a dry content of about 90% by weight.

[0053] Three samples were also dried in an impingement dryer after casting on the heated belt. The samples were prepared by casting the MFC suspension onto a heated metal belt (all samples were cast on a belt at a temperature of 110°C) and then dried in an imping...

Embodiment 3

[0060] A suspension at a concentration of 4% by weight comprising 70% by weight of microfibrillated cellulose based on total dry weight was cast onto a heated metal belt to form a fibrous web. The fibrous web is then guided through the impingement dryer on the same metal belt. The web was dried in an impingement dryer where hot air was blown against the cast fibrous web. Different temperatures of the metal belt and furnish before casting were tested to see how this affects the drying time of the web.

[0061]The drying time is then measured until the film has a dry content of at least 90% by weight. The drying rate during the test was 80kg(H2O) / m 2 / h.

[0062] The test results are shown in image 3 middle. F30 indicates that the temperature of the furnish is 30°C, B30° indicates that the temperature of the belt is 30°C, and the same is true for the other samples. from image 3 As is evident in , the drying time of the MFC film is reduced when the tape has a very high t...

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Abstract

The present invention relates to a method for the production of a film comprising microfibrillated cellulose, wherein the method comprises the steps of; providing a suspension comprising between 70 weight-% to 100 weight-% of microfibrillated cellulose based on total dry weight, forming a fibrous web of said suspension, drying the web in a drying equipment wherein the web is at least partly driedat a drying rate above 75 kg(H2O) / m2 / h by use of hot air whereby a film is formed. The invention also relates to a film produce according to the method and a paper or paperboard substrate comprising said film.

Description

technical field [0001] The present invention relates to a process for producing a film comprising microfibrillated cellulose, a microfibrillated film and a paper or board product produced according to the process. Background technique [0002] Films comprising microfibrillated cellulose (MFC) are known to have good strength and oxygen barrier properties. This is eg described by Syverud, "Strength and barrier properties of MFC films", Cellulose 2009 16:75-85, where MFC films with a basis weight (weight) of 15-30 gsm were prepared and the strength and barrier properties were investigated. [0003] During the preparation of MFC membranes, it is not easy to dehydrate and prepare membranes at high speed due to the characteristic properties of microfibrillated cellulose. When using MFC films eg as a barrier layer it is crucial that the film does not have any pinholes or other defects which would negatively affect the barrier properties. Therefore, it is important that the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/18C08J5/18C08L1/02D21F5/18D21H19/00
CPCC08L1/02D21F5/004D21F5/18D21H19/00B32B2307/7244C08B15/02D21H11/18C08J5/18C08J2301/02
Inventor R.皮科V.库纳里
Owner STORA ENSO OYJ
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