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Low-opacity release paper, release paper backing and methods

A technology of release paper and backing, applied in the direction of copying/marking method, paper making, paper coating, etc., which can solve the problem of expensive preparation of high-density paper products

Inactive Publication Date: 2007-03-28
BOISE WHITE PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to their handling requirements, high density paper products are very expensive to manufacture

Method used

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  • Low-opacity release paper, release paper backing and methods
  • Low-opacity release paper, release paper backing and methods
  • Low-opacity release paper, release paper backing and methods

Examples

Experimental program
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preparation example Construction

[0055] The method of making the release paper and release paper backing of the present invention can be accomplished by forming a core sheet, applying the first and second coatings and hot soft calendering the overall product. These steps can be accomplished using conventional papermaking equipment. For example, the core can be formed by a continuous process using a Fourdrinier paper machine or with a twin wire forming section. The Fourdrinier paper machine includes a "wet end" where the pulp is mixed and then deposited on a screen, pressed and dried. Dye can be added at the wet end before the sheet forming section of the paper machine. This generally promotes even incorporation of the dye into the core.

[0056] In embodiments comprising a first coating and a second coating, these coatings may be applied separately or simultaneously. A variety of coaters can be used to apply the primary coat and / or the secondary coat, including: knife coaters, roll coaters, gravure coaters...

Embodiment 1

[0071] This example describes an exemplary embodiment of the release paper backing of the present invention. This embodiment includes a core, a first coating, and a second coating arranged in the configuration shown in FIG. 2 .

[0072] The coreboard consists of bleached chemical pulp from the kraft pulping process, containing both hardwood and softwood fiber types. Yellow dye was added to the core material at about 1.9 oz / ton. The yellow dye was CARTOSOL supplied by Clariant Corporation (Muttenz, Switzerland)  Yellow 3GF.

[0073] The first coat comprises about 100 parts clay, about 5 parts starch, about 25 parts latex, and about 1 part crosslinker. This first coat is applied such that the clay, starch, latex and crosslinker are each applied in amounts of approximately 5.0 lbs / 3000 ft 2 (260lbs / ton), about 0.25lbs / 3000ft 2 (13lbs / ton), about 1.2lbs / 3000ft 2 (66lbs / ton), about 0.05lbs / 3000ft 2 (2.7lbs / ton). The total application amount of the first coat is about 6.5lb...

Embodiment 2

[0080] This example describes the method used to prepare the release paper backing described in Example 1. Bleached chemical pulp and yellow dye are mixed at the wet end of a Fourdrinier paper machine. After pressing and drying, the first and second coats were applied, respectively, using a knife coater and a roll coater in a simultaneous double-side coating application system. The coated product was subsequently calendered in-line with two nips for hot soft calendering. The calender rolls are heated to about 200 F to about 250 F and loaded to 500 pli to about 1000 pli.

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PUM

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Abstract

The invention relates to a stripping paper and its back lining, the two of which may comprise fiber net and yellow and / or red dye. The luminous transmittance of the paper and the back lining for example at the part of about 680nm wavelength is about 40%--80%. Its Gurley density may be about 4000 second-10000 second. The stripping paper and back lining has stronger light permeability than that of existing one.

Description

technical field [0001] The present invention relates to release papers, release paper backings and related methods, and in particular to release papers and release paper backings having enhanced optical properties and suitable for use in photosensitive elements such as LED (Light Emitting Diode) sensors. Background technique [0002] Release paper is often used for temporary storage of flat objects, such as labels, that need to be easily detachable. Objects that are usually preserved with release paper have an adhesive layer that helps protect that adhesive layer from degrading until the object is ready for use. For example, contacting the adhesive side of the label with a release paper sheet by the label applicator allows the label to be stored, shipped and handled. [0003] Most forms of release paper include a release-coated release-paper backing. Release coatings may contain lubricants, such as silicones, which can hinder adhesion. When it comes into contact with the ...

Claims

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Application Information

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IPC IPC(8): B32B9/06B41M5/10D21H23/00
CPCB41M5/50D21H25/14D21H27/001D21H23/22D21H19/10
Inventor 丹尼尔·G·弗里马修·F·沃纳梅克珍妮弗·利恩弗兰克·爱德华兹布鲁斯·赫普
Owner BOISE WHITE PAPER
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