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Method of manufacturing film having low oxygen transmission rate values

A calendering and web technology, applied in the field of film manufacturing, can solve problems such as non-profit cost structure

Active Publication Date: 2020-02-21
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such complex structures may bring other disadvantages, such as aspects of biodegradability and sustainability, or non-profitable cost structures

Method used

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  • Method of manufacturing film having low oxygen transmission rate values
  • Method of manufacturing film having low oxygen transmission rate values
  • Method of manufacturing film having low oxygen transmission rate values

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Trials were carried out on pilot paper machines running at 15 m / min and 9 m / min to produce MFC membranes from softwood (B) and hardwood (C) kraft pulp, respectively. In addition to MFC, a variety of processing and performance chemicals are added, including any of the following: retention aids, wet strength chemicals, optical agents, drainage chemicals, biocides, lubricants, defoamers, etc. Table 1 summarizes the samples.

[0087] Table 1. Sample Example 1

[0088] B C Fiber source, % MFC (coniferous wood) MFC (hardwood) Gram weight, g / m 2

30.8 27.4

[0089] MFC webs B and C produced on the pilot paper machine were calendered using a soft gap laboratory calender. The results of the tests performed are disclosed in Table 2, which discloses the measured oxygen transmission rate (OTR) of the treated samples (ie the formed films).

[0090] In order to evaluate the effect of calendering of MFC films on PE-coatings, 25 g / m 2 The calender...

Embodiment 2

[0095] A surface sized MFC web sample made according to Sample B in Example 1 with a medium oxygen transmission rate was calendered using a soft gap laboratory calender. Different temperatures and pore pressures were used during the experiments and some test points were run through the calender several times. The samples were characterized for light transmittance, Bendtsen and PPS roughness and thickness values. For selected samples, the oxygen transmission rate was also recorded at 65% relative humidity. OTR values ​​were determined at elevated relative humidity as it is believed to better reveal possible differences between samples.

[0096] The results compiled in Table 3 reveal that depending on the calendering conditions, the light transmission can be increased and the thickness, roughness and oxygen transmission rate of the MFC film can be reduced (ie oxygen barrier properties can be improved by calendering).

[0097] Therefore, the calendering conditions should be opt...

Embodiment 3

[0103] Trials were carried out on a pilot paper machine running at 15 m / min to produce MFC membranes from softwood kraft pulp with either hardwood or softwood kraft pulp added to the MFC. In addition to MFC, conventional wet-end chemicals such as wet-strength chemicals, fillers, sizing agents, etc. are added.

[0104] Test point P11_1 is the reference group containing 100% MFC as fiber source.

[0105] In test points P11_3, and P11_4, respectively, 30% by weight, and 50% by weight of hardwood fibers were mixed with MFC in a pulper, followed by mixing the fibers and MFC with a fiberizer. In test points P11_5 and P11_6, 15% by weight of softwood fibers were mixed with MFC in a pulper, followed by mixing of fibers and MFC with a fiberizer.

[0106] Table 4 summarizes the test points.

[0107] Table 4. Test points.

[0108]

[0109] * Add long fiber to pulper, mix with MFC with fiberizer

[0110]The MFC webs produced on the pilot paper machine were calendered using a soft g...

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Abstract

A method of manufacturing a film having an oxygen transmission rate (OTR) value in the range of 0.1 to 200 cc / m2*24h at 23 degrees centigrade, 50 % relative humidity (RH), and an OTR value in the range of 0.1 to 2000 cc / m2*24h at 38 degrees centigrade at 85 % RH, comprising at least 60 % by weight nanocellulose based on the weight of the total amount of fibers in the film, wherein the method comprises the steps of, providing an aqueous suspension comprising the nanocellulose; forming a web from the aqueous suspension; calendering the web at a line load of at least 40 kN / m, and at a temperatureof at least 60 degrees centigrade, wherein the film is formed and the web has an OTR value in the range of 50 to 10000 cc / m2*24h at 23 degrees centigrade, 50 % RH before the calendering step, or morepreferably in the range of 500 to 5000 cc / m2*24h at 23 degrees centigrade, 50 % RH before the calendering step.

Description

technical field [0001] The present invention relates to a method for the manufacture of films comprising nanocellulose, such as microfibrillated cellulose, which films have low oxygen permeability values, especially under tropical conditions, ie high temperature and high relative humidity. In particular, the invention relates to a manufacturing method comprising a calendering step. Background technique [0002] In the manufacture of paper, calendering is the process of smoothing the surface of paper at the end of the papermaking process by pressing the paper between cylinders or press rolls (ie calenders). Using an additional calender or group of supercalenders after the papermaking process produces an even smoother, thinner paper, which is called supercalendered paper. For these paper grades, calendering is done primarily to improve paper gloss and printability. Grease-resistant thin papers such as glassine paper (50-90 gsm) are traditionally calendered to provide improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B82Y30/00D21H11/18D21H25/04
CPCB82Y30/00D21H25/04D21H27/10D21H11/18D21H25/005C08J5/18C08J2301/02C08J7/0427C08J7/048C08J2423/04C08L1/02B32B27/10B32B2307/7244B32B2439/70B32B29/005B32B2262/062B32B5/06B32B23/06B32B23/08
Inventor E.索科宁I.黑斯卡宁K.莱蒂凯宁K.巴克福尔克
Owner STORA ENSO OYJ
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