CN104861764B

CN104861764B - Technology for removing laser printing or copying handwriting on surface of paper

Info

Publication number: CN104861764B
Application number: CN201410063574.3A
Authority: CN
Inventors: 胡锴; 张涛; 庄期凯
Original assignee: Individual
Current assignee: Hu Jie
Priority date: 2014-02-26
Filing date: 2014-02-26
Publication date: 2020-08-11
Anticipated expiration: 2034-02-26
Also published as: CN104861764A

Abstract

The invention discloses a technology for removing laser printing or copying handwriting on the surface of paper, which comprises a removing solution and a removing method. The formulation of the removing solution comprises hydrofluoric acid, self-solidifying denture base polymer (also called denture base water) and water (tap water or distilled water), and the formulation proportion is as follows. The removing method is to soak the paper. The invention utilizes the principle of 'similarity and compatibility' and dissolves laser printing or copying handwriting on the surface of paper by the prepared solution, thereby achieving the purpose of removal. Since the dissolving method causes almost no damage to the paper, the removed paper can be recycled.

Description

Technology for removing laser printing or copying handwriting on surface of paper

Technical Field

The invention relates to a method for removing laser printing or copying handwriting on the surface of paper, in particular to a method for removing the laser printing or copying handwriting on the surface of the paper by chemical dissolution through solution preparation.

Background

With the rapid popularization of computers and the internet and the acceleration of information-based construction of governments, enterprises and households, laser printers and laser copiers are widely used due to the advantages of high image quality, high printing/copying speed, relatively low cost during mass printing/copying and the like. At present, laser printers and laser copiers have become indispensable output devices for modern offices.

Meanwhile, the proliferation of document materials caused by the increase of modern office activities and the reprinting/copying error caused by human factors also cause the large consumption of paper. According to statistics, the annual growth rate of the consumption of global office paper is more than 7 percent in recent years, and the usage amount of the copy paper in China reaches 1,200,000 tons in 2006, so that the deforestation caused by the consumption reaches more than ten million cubs. However, due to the limitation of the current technical conditions, the writing on the working surface of the paper after laser printing or copying cannot be effectively removed, so that the paper cannot be recycled, which not only causes great economic waste, but also causes serious damage to the ecological environment due to waste water, waste gas, waste residues and the like generated in the paper making process.

In order to research the technology for removing the handwriting on the surface of the paper after laser printing and copying, a writer adopts various chemical reagents to try to remove the handwriting, and an ideal technology for removing the handwriting on the surface of the paper after laser printing and copying is obtained in the process. .

Through searching the patent documents at home and abroad, no related patent application is found. At present, no domestic patent related to clearing of the handwriting on the surface of the paper after laser printing and copying is seen. [ Japanese patent office, European patent office, United states patent office. Suggested keywords: and laser printing and laser copying handwriting clearing. ]

Disclosure of Invention

The invention aims to provide a technology for removing laser printing or copying handwriting on the surface of paper, and particularly relates to a removing method and a removing solution. The method has the advantages of simplicity, convenience for operation and the like. The solution also has the advantages of convenient configuration and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

a technology for removing the laser printed or copied writing on the surface of paper includes such steps as removing the writing on the surface of paper by laser, and removing the solution. The removing solution is a mixed solution of hydrofluoric acid, self-setting denture base polymer (also called denture base water) and water (tap water or distilled water). The removal method is a method of soaking or a method of using mechanical vibration such as ultrasonic wave simultaneously with soaking.

The removing solution is a mixed solution of hydrofluoric acid, self-solidifying denture base polymer (also called denture base water) and water (tap water or distilled water), and is prepared according to a certain proportion.

The removing method can be a method for simply soaking paper.

The removing method may be a method of immersing the paper and simultaneously applying mechanical vibration such as ultrasonic waves.

The invention applies the principle that the chemical substances are similar and the same, thereby successfully removing the laser printing or copying handwriting on the surface of the paper.

The invention has the advantages that:

1. all chemical reagents for preparing the removal solution belong to common chemical reagents and are convenient to purchase.

2. The removal method is simple and easy to implement and has a wide application range.

3. The paper after the handwriting is removed by using the technology is recovered as new and can be recycled.

Principle of the invention

The toner in the selenium drum for optical printing or copying mainly comprises the following components: iron oxide Fe₃O₄Crystalline Powder (PLGENT) accounting for 20-30%; polyacrylate-styrene copolymer 50-60%; charge regulator CCA, accounting for 10-20%; fluidizing agent SiO₂Etc.; surface modifier polyethylene/polypropylene paraffin.

While the main component of the self-setting denture base polymer (denture water) is methyl methacrylate: CH (CH)₂＝C(CH₃)COOCH₃

When the solution is prepared in the first step, methyl methacrylate in the tray water reacts with hydrofluoric acid as follows:

thereby producing methyl 2-fluoroisobutyrate (C)₅H₉FO₂). Methyl 2-fluoroisobutyrate has a chemical structure very similar to polyacrylate in the handwriting of printing or copying ink powder, and has a C-F bond with extremely strong electronegativity. According to the principle of similarity and compatibility of compounds, 2-fluoroisobutyric acid methyl ester has stronger intersolubility with polyacrylate in printing or copying ink powder writing. In addition, the excess methyl methacrylate remaining in the prepared solution has better intersolubility with polyacrylate. Therefore, the solution prepared in the first step is actually a solvent for preparing the resin-like substance as the main component of the ink powder in the toner cartridge.

In the process of soaking paper, the resin in the ink powder for laser printing or copying the handwriting is dissolved to cause the handwriting to be loose and fall off, thereby achieving the purpose of removing the handwriting. When the solution is vibrated by mechanical means such as ultrasonic waves, the solution is accelerated by the impact and stirring action of the vibrationAnd (5) a shedding process. In addition, the inventors have considered that hydrogen ions released in the solution may also react with inorganic oxides (Fe) in the toner₃O₄And SiO₂) Reduction reaction occurs, and the removal process of the handwriting is accelerated.

Detailed Description

The invention relates to a technology for removing laser printing or copying handwriting on the surface of paper by adopting a chemical solution, which mainly adopts a soaking method to remove the handwriting on the surface of the paper. In the following embodiments, the removal solution is used only in conjunction with an ultrasonic cleaning machine for explanation.

The ultrasonic cleaning machine is characterized in that a high-frequency oscillation signal emitted by an ultrasonic generator is converted into high-frequency mechanical oscillation through a transducer and is transmitted into a medium, namely a cleaning solvent, ultrasonic waves are radiated forwards at intervals in a cleaning liquid to make the liquid flow to generate tens of thousands of micro-bubbles with the diameter of 50-500 mu m, and the micro-bubbles in the liquid vibrate under the action of a sound field. These bubbles are formed and grown in a negative pressure region where the ultrasonic wave propagates in the longitudinal direction, and in a positive pressure region, when the sound pressure reaches a certain value, the bubbles rapidly increase and then suddenly close. When the bubbles are closed, shock waves are generated, thousands of atmospheric pressures are generated around the bubbles, insoluble dirt is damaged, and the insoluble dirt is dispersed in the cleaning liquid, and when the group particles are wrapped by the oil dirt and adhered to the surface of a cleaning piece, the oil is emulsified, solid particles are separated, so that the aim of cleaning the cleaning piece is fulfilled.

The invention provides a method for removing writing on the surface of paper after laser printing or copying, which comprises the steps of removing the components and the proportion of a solution and a removing method. The removing solution is denture base resin (II type) self-solidifying denture base water, hydrofluoric acid and water, and the removing method is a soaking method or an ultrasonic oscillation soaking method.

Example 1:

taking the removal of the writing on the surface of the paper after laser printing as an example, the laser printer used in the method is a HPLaserJet1020 type laser printer. The specific process of this embodiment is:

the first step is as follows: preparing a solution: respectively measuring 500mL of denture base resin (II type) self-solidifying denture base water and 10mL of hydrofluoric acid (analytically pure) by using a measuring cylinder, and mixing in a container;

the second step is that: and (3) handwriting clearing: completely immersing the paper to be cleaned with the handwriting into the prepared solution, and placing the solution into an ultrasonic cleaning machine. The ultrasonic cleaner was turned on, and after about 2 minutes of its operation, the apparatus was turned off and the paper was taken out of solution. In this implementation, the irritating odor of tooth dehydration and the volatility of hydrofluoric acid (analytically pure) are preferably carried out under ventilation conditions.

The third step: drying paper: and cleaning the cleaned paper in tap water to remove the residual cleaning solution on the surface of the paper. After the paper is washed clean, the plastic packaging machine performs plastic coating once or twice, and the paper which is flat and as new can be obtained.

Example 2:

taking the removal of writing on the surface of a sheet after laser copying as an example, the laser copying machine used therein is a canonir 2016J type copying machine. The specific process of this embodiment is:

Claims

1. The application of the solution in removing the laser printing or copying handwriting on the surface of the paper is characterized in that the solution is used for removing the laser printing or copying handwriting on the surface of the paper and is a mixed solution of hydrofluoric acid, denture water and water.