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Hot-pressing tympan paper and manufacturing method thereof

A technology of cardboard and natural color paste, which is applied in the field of papermaking, can solve the problems of high cost, poor high temperature resistance, and easy brittleness of cardboard, and achieve high utilization rate and cost reduction

Active Publication Date: 2011-11-16
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manufacturers at home and abroad mainly use natural color broadleaf or softwood wood pulp as raw material to make kraft paper as hot-pressed backing paper. The disadvantages are as follows: 1. This kind of hot-pressed backing paper is generally made of pure wood pulp, and the cost 2. The hot-pressed backing paper made entirely of plant fibers has poor high temperature resistance, and the cardboard is easy to become brittle; 3. Poor air permeability leads to low heat transfer efficiency and uneven heat transfer; 4. Higher density cardboard will Affects cushioning capability and may cause damage to copper clad laminates

Method used

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  • Hot-pressing tympan paper and manufacturing method thereof
  • Hot-pressing tympan paper and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The weight of copying is 160g / m 2 The dry pulp weight of the natural color pulp used in the surface layer and the bottom layer accounted for 20% of the total dry pulp weight, and the dry pulp of the natural color pulp and fly ash fiber pulp mixed pulp used in the core layer The weight accounts for 60% of the total dry pulp weight, wherein the dry weight ratio of natural color pulp to fly ash fiber pulp is 25:75.

[0019] The papermaking technology of above-mentioned hot-pressed pad paper, concrete steps are:

[0020] In the first step, the natural color pulp board with a beating degree of 15°SR is beaten with free long fibers, the beating weight concentration is 3%, the beating degree is 20°SR, the average length of the fibers after beating is 4mm, and the diameter is 35-50μm. Then add a strengthening agent cationic polyacrylamide solution to the slurry, the cationic polyacrylamide content in the slurry is 0.005%, stir at room temperature for 20 minutes until the dispe...

Embodiment 2

[0025] The weight of copying is 160g / m 2 The dry pulp weight of the natural color paste used in the surface layer and the bottom layer accounted for 25% of the total dry pulp weight; the dry pulp of the mixed pulp of the natural color paste and fly ash fiber pulp used in the core layer The weight accounts for 50% of the total dry pulp weight, wherein the dry weight ratio of natural color pulp and fly ash fiber pulp is 32:68.

[0026] The papermaking technology of above-mentioned hot-pressed pad paper, concrete steps are:

[0027] In the first step, the natural color pulp board with a beating degree of 15°SR is beaten with free long fibers, the beating weight concentration is 3%, the beating degree is 25°SR, and the average length of the fibers after beating is 3.5mm and the diameter is 35-50μm , and then add a reinforcing agent cationic polyacrylamide solution to the pulp, the cationic polyacrylamide content in the pulp is 0.005%, stir at room temperature for 20 minutes until...

Embodiment 3

[0032] The weight of copying is 160g / m 2 The dry pulp weight of the natural color paste used in the surface layer and the bottom layer accounted for 30% of the total dry pulp weight; the dry pulp of the natural color paste and fly ash fiber pulp mixed pulp used in the core layer The weight accounts for 40% of the total dry pulp weight, wherein the dry weight ratio of natural color pulp and fly ash fiber pulp is 40:60.

[0033] The papermaking technology of above-mentioned hot-pressed pad paper, concrete steps are:

[0034] In the first step, the natural color pulp board with a beating degree of 15°SR is beaten with free long fibers, the beating weight concentration is 3%, the beating degree is 30°SR, the average length of the fibers after beating is 3mm, and the diameter is 35-50μm. Then add a strengthening agent cationic polyacrylamide solution to the slurry, the cationic polyacrylamide content in the slurry is 0.005%, stir at room temperature for 20 minutes until the disper...

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Abstract

The invention provides hot-pressing tympan paper and a manufacturing method thereof. The hot-pressing tympan paper is composed of a surface layer, a core layer and a bottom layer, wherein, the oven dry stock weight of the surface layer accounts for 20-30% of the total oven dry stock weight, the oven dry stock weight of unbleached pulp used by the bottom layer is the same as the oven dry stock weight of batter, the oven dry stock weight of unbleached pulp and coal ash fiber slurry used in a core layer accounts for 40-60% of the total oven dry stock weight, and the oven dry weight ratio of unbleached pulp to coal ash fiber slurry is 25-40:60-75. The method is characterized in that a multi-layer manufacturing technique of the core layer containing coal ash fiber is adopted to generate hot-pressing tympan paper, compared with a manufacturing technique adopted by current hot-pressing tympan paper, the produced hot-pressing tympan paper has the advantages of level surface, large bursting strength, strong buffering capacity, good temperature tolerance, good temperature conductivity and the like.

Description

technical field [0001] The invention relates to a paperboard and a papermaking method thereof in the papermaking industry, and belongs to the technical field of papermaking. Background technique [0002] Hot-pressed backing paper is a special backing paper required in the hot-pressing forming process of manufacturing copper-clad laminates. The thermoforming process requires one or two layers of backing paper to be laid on the laminated board and the lower side for protection. In order to avoid the laminated board from being worn and stained, compared with the performance requirements of general industrial paper, the hot-pressed backing paper has an effect on the surface smoothness, cushioning capacity, heat transfer performance, burst resistance and temperature resistance of the board. special requirements. Manufacturers at home and abroad mainly use natural color broadleaf or softwood wood pulp as raw material to make kraft paper as hot-pressed backing paper. The disadvan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/00D21D1/00D21F13/04D21H27/38B32B29/02
Inventor 吴立群贺磊
Owner CHINA HAISUM ENG
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