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Heat-sealing barrier paper

A heat-sealing and pre-coating technology, used in papermaking, packaging paper, paper coatings, etc., can solve problems such as restricting development and increasing costs, and achieve the effect of enhancing the barrier level, promoting online drying, and enhancing the barrier effect.

Active Publication Date: 2017-08-18
奥斯龙明士克公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Off-line conversion of paper in order to impart water vapor barrier properties and heat-sealing properties to paper is therefore an additional step in the manufacture of paper, which significantly increases the cost and limits the development of paper in flexible packaging supporting plastic film packaging

Method used

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  • Heat-sealing barrier paper
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Manufactured with a basis weight of 55g / m on a paper machine running at 400m / min 2 fiber carrier. The paper machine is equipped with a Yankee dryer placed before the size press.

[0088] The surface of the fibrous support is first smoothed and then treated on both sides by a sizer in-line with a pore-filling pigment composition comprising 100 parts by dry weight of kaolin (Cadam) of the Amazon Premium type, and Mixture of 20 parts by dry weight of Merifilm 104 starch (Tate & Lyle) and latex of type DL950 (Dow) relative to dry kaolin. When fully dry, the applied treatment is 5g / m 2 .

[0089] A Meyer rod coater is then used to coat a pre-coat formulation comprising a mixture of platy fillers and finer particulate fillers and a latex with a styrene-butadiene chemistry of Tg = 7°C (from DL950 from Dow Chemical) in an infrared oven followed by a hot air oven without contact. It was wound on rolls without further handling. The dry weight of the applied precoat is 7g / m ...

Embodiment 2

[0095] The surface of the fibrous support is first smoothed and then treated on both sides by a sizer in-line with a pore-filling pigment composition comprising 100 parts by dry weight of kaolin (Cadam) of the Amazon Premium type, and Mixture of 20 parts by dry weight of Merifilm 104 starch (Tate & Lyle) and latex of type DL950 (Dow) relative to dry kaolin. When fully dry, the applied treatment is 5g / m 2 .

[0096]A Meyer rod coater was then used to coat a formulation comprising a mixture of platy fillers and finer particulate fillers and a latex with styrene-butadiene chemistry (DL950 from Dow Chemical) with a Tg = 7°C. ), dried without contact in an infrared oven, then in a hot air oven. It was wound on rolls without further handling. The dry weight of the applied precoat is 7g / m 2 And its formula is given in the following table:

[0097]

[0098] 95% by weight of the Hydrocarb 95 has a particle size of less than 2 microns measured according to the ISO 13317-3 SediGr...

Embodiment 3

[0101] Paper was produced on-line under the same conditions as in Example 1. But after depositing the precoat, a cover layer consisting of a dispersion of PVdC copolymer (Diofan A297 from Solvay) was applied in-line and dried without contact in an infrared oven and then in a hot air oven. It was wound on mandrels without further handling and no blocking was observed between turns. The dry weight of the covering layer is 6.5g / m 2 .

[0102] The barrier to water vapor was measured by a Mocon Permatran 3 / 61 machine at 38°C and 90% relative humidity according to ASTM F1249 standard. The barrier to water vapor is 21.0±2.4g / m 2 / 24h.

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Abstract

The invention relates to a paper comprising: a fibrous substrate; a precoat including a binder and a mixture of lamellar filler(s) having a form factor of at least 15 and of finer filler(s) having a particle size, at a concentration of 80% by weight, of less than 2 um (measured using the SediGraph technique according to ISO 13317-3); and at least one coating layer applied to the precoat, said paper having a water vapour permeability of at most 150 g / m2 / 24h and preferably less than 100g / m2 / 24h, measured according to ASTM F 1249 under so-called tropical conditions of 38 DEG C and 90% relative humidity.

Description

technical field [0001] The invention relates to the field of wrapping paper. Background technique [0002] Plastic films are widely used in flexible packaging because they have the water vapor barrier properties necessary for proper preservation of perishable products or products with a limited shelf life. [0003] Paper is a material made of fibres, usually cellulose fibres, and is thus of vegetable origin. They are naturally porous and gas permeable and therefore cannot be used for this application by themselves. [0004] However, it is known to combine paper with other materials (plastic, aluminum, etc.) to obtain the barrier necessary for packaging various products, especially perishable foods. In this case, the paper substrate is subjected to a converting operation comprising, for example, the coating of a cover layer made of a polymer in dispersed form, extrusion coating of a molten polymer or lamination with a plastic or aluminum film . The cost of the paper-based...

Claims

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Application Information

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IPC IPC(8): D21H19/38D21H19/40D21H19/58D21H19/82D21H27/10D21H21/52B65D65/42
CPCB65D65/42D21H19/38D21H19/385D21H19/40D21H19/58D21H19/82D21H19/826D21H21/52D21H27/10D21H19/22D21H19/54D21H19/62D21H19/84D21H21/16
Inventor 劳伦·席尔德克内希特塞维琳·肖特帕斯卡莱·埃斯卡弗尔
Owner 奥斯龙明士克公司
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