Electromagnetic shielding plate and manufacturing method thereof

A production method and electromagnetic shielding technology, applied in the direction of magnetic field/electric field shielding, electrical components, etc., can solve the problems of poor mechanical properties, bending resistance, secondary environmental pollution, complex structure, etc., and achieve low cost, simple and feasible method, and easy implementation convenient effect

Active Publication Date: 2012-07-25
NANJING FORESTRY UNIV +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The first is wood-plastic technology, which is to crush Tetra Pak packaging waste and produce wood-plastic products by extrusion, but the mechanical properties of this wood-plastic product are poor, especially the bending resistance
The second is the hydraulic recycled pulp technology, which is to separate the pulp from Tetra Pak packaging waste to produce recycled paper, extrude and granulate the aluminum-plastic film after the pulp is peeled off, and become the raw material for plastic-aluminum products, or process the aluminum-plastic film Aluminum and plastic are separated to obtain polyethylene plastic and metal aluminum, but this technology only transfers the polluting medium, which will cause serious secondary environmental pollution
This "color music board" technology requires forming hot pressing equipment with complex structure and complex process

Method used

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  • Electromagnetic shielding plate and manufacturing method thereof
  • Electromagnetic shielding plate and manufacturing method thereof
  • Electromagnetic shielding plate and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1-10

[0027] Embodiment 1-10: plate (electromagnetic shielding plate)

[0028] Plate (electromagnetic shielding plate) production steps:

[0029] a. Preparation of paper / plastic / aluminum fiber mixture: Tetra Pak packaging waste is cut, crushed and shredded to obtain a paper / plastic / aluminum fiber mixture. The particle size of the paper / plastic / aluminum fiber mixture is: below 40 mesh (3.58%), 40-50 mesh (35.70%), 50-60 mesh (25.00%), 60-70 mesh (3.60%), 70- 80 mesh (32.12%). The moisture content of the paper / plastic / aluminum fiber mixture is 3-4%.

[0030] b. Pavement: see figure 1 , with paper / plastic / aluminum fiber mixture 1 as the base material, metal fibers of different types, different diameters, and different lengths listed in Table 1 as filling materials, paved into compacts; paving metal fiber layers in the compacts Layers of 2 ( figure 1 Two layers are shown in ) and the amount of metal fiber added per square meter of compact is listed in Table 1. The applied amount o...

Embodiment 11

[0036] Example 11: Tetra Pak waste / poplar veneer electromagnetic shielding composite board (electromagnetic shielding board)

[0037] Production process steps of Tetra Pak waste / poplar veneer electromagnetic shielding composite board.

[0038] 1. Preparation of paper / plastic / aluminum fiber mixture, the process flow is divided into:

[0039] Tetra Pak packaging waste is cut, shredded and pulverized to obtain a paper / plastic / aluminum fiber mixture. The particle size of the paper / plastic / aluminum fiber mixture is: below 40 mesh (3.58%), 40-50 mesh (35.70%), 50-60 mesh (25.00%), 60-70 mesh (3.60%), 70- 80 mesh (32.12%). The moisture content of the paper / plastic / aluminum fiber mixture is 3%.

[0040] 2. Preparation of wood veneer (poplar veneer)

[0041] 1) For veneer manufacturing, the density is 0.40g / cm 3 The fast-growing poplar logs are cut off, peeled and peeled to make poplar veneer strips with a rotary cutting machine, and the thickness is controlled at 0.8±0.02mm;

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Abstract

The invention provides a method for manufacturing an electromagnetic shielding plate by effectively recycling Tetra Pak wastes. The manufacturing method comprises the following steps of: crushing the Tetra Pak wastes to obtain a mixture of paper / plastic / aluminum fibers; with the mixture of paper / plastic / aluminum fibers as a base material and metal fibers with diameter of 30-60 mu m and length of 3-10 mm as a filling material, laying to form a green compact; laying at least one metal fiber layer in the green compact, wherein the addition quantity of the metal fibers in the green compact per square meter is 90-125g; and finally pressing the green compact into a plate. The method is simple and feasible, is convenient to implement and has low cost. The prepared plate has an excellent shielding effect and good physical mechanical properties.

Description

technical field [0001] The invention relates to an electromagnetic shielding board and a manufacturing method thereof, in particular to an electromagnetic shielding composite board made of Tetra Pak packaging waste and wood veneer as raw materials. Background technique [0002] With the development of science and technology, flexible packaging has entered an era of rapid development. Tetra Pak occupies a pivotal position in flexible packaging. It is estimated that nearly 70% of the aseptic composite packaging widely used in the global beverage and milk industry is produced by Tetra Pak. According to incomplete statistics, in 2008 Tetra Pak's annual production capacity in China reached 40 billion packs, sales of about 27 billion packs, and recycling of about 2.8 billion packs, with a recovery rate of only 10%. Hundreds of millions of Tetra Pak packs were landfilled as garbage, Incineration not only wastes resources, but also causes serious secondary environmental pollution. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
Inventor 徐长妍刘杰雷响杨晓刚朱旭东胡玉安周捍东
Owner NANJING FORESTRY UNIV
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