Technology News

Affect the countermeasures

2016-07-11 15:11:23
In each link of the process of printing, processing is undeserved, can cause environmental pollution, so as to produce adverse effect to human body and environment, mainly displays in:
The air pollution
Solvent ink in the drying process of organic compounds, alcohol, isopropyl alcohol of wetting liquid, hot melt adhesive used in the wireless with gum, glazing coating volatile gases are about air pollution, harmful to human health.
Air pollution control countermeasures
The company's main printing process for water, the flexible printing process, in order to control
Packaging and printing
Packaging and printing
Organic volatiles of air pollution phenomenon in ink, always adhere to the implementation of ISO14001 environmental management system certification standards, ink container and all the waste classification processing, to eliminate all waste litter the place caused by environmental pollution. Adopt contain less pollution in the production process of printing raw materials and auxiliary materials, mainly in the printing ink on the adoption of strictly controlled. Synthesis of water-based ink, there are two common: one is the highest contain toxic substances of rosin and paint, and starch synthesis. The ink in the organic solvent harm to human health. The other is a synthesis of water-based ink and paint, high-grade printing ink. This is green, environmentally friendly water-based ink contains the organic matter and low poison material composition, compared to people and environment produce harm and other air pollution was greatly reduced, also is the present domestic one of the most environmentally friendly printing materials, the company has 99% of the printing materials using this material.
Water pollution
Plate making use of corrosion in the process of liquid and electroplating wastewater containing heavy metals and other inorganic substances, printing ink cleaning discharge liquid containing organic matter, all is one of the causes of water pollution, at the same time can also cause pollution to the soil.
The control countermeasures of water pollution
The company is especially pay attention to this aspect of prevention, because water is the foundation of all things live, therefore invested a large part of the capital construction of sewage treatment system (including pipeline and equipment room). Packaging and printing industry's biggest pollution is cleaning the plate and the waste oil press ink binders starch synthesis and cardboard wastewater, the two kinds of pollution if not handled direct emissions, will cause serious water environment pollution. Because these two kinds of sources to contain COD7000mg/L, 1500 mg/L SS (suspended solids), chroma, 550 times, PH 6 ~ 9 of sewage, so great harm. After the company through the installation of sewage disposal system, all sewage multiprocessing filtered water quality by this system achieves the standard, COD acuities were 100 mg/L, SS (suspended solids) 70 mg/L, chromaticity acuities were 50 times more or less, PH 3 ~ 4. By processing of sewage recycling, again after water saving 90% good effect, saving energy and reducing consumption and do a good job in the environmental protection that surround the company factory building more than 20 mu river, pond, 130 mu HaTang and crab pond without any impact, highly praised by local villagers.
Noise pollution
Printing machine, air compressor and various molding machine can produce different levels of noise and other binding equipment noise is very big also.
The control countermeasures of noise pollution
The company all adopt PLC full computer low noise environmental protection printing machine and assembly line and other molding equipment, including boiler tubes for large motors and spirit all through special processing, factory is closed mixed sound insulation wall design, put an end to all caused by equipment on surrounding noise pollution (including lighting pollution), and through the detection of environmental protection department. Over the past few years and the surrounding villagers had no contradiction, due to environmental problems is the environmental protection work with enterprise development, also make the environmental protection work really bring the benefit for the enterprise, also so many times by the environmental protection department.
Waste pollution
Printing process of waste printed matter, waste pollution, ink, glue, glazing oil container after throwing away the pollution, scrap, waste after printing or testing-run of printed matter produce pollution to the environment.
Control the countermeasure of the wastes
To special printing process of all kinds of waste collection, valuable items, such as paper for recycling, such as film, plastic film refractory environmentally damaging substances, by the recycling of the waste recycle bin unified recycling or sanitary landfill.
The most effective way is to avoid waste produced in the first place. Reduce waste can help enterprises to reduce operating cost, maintain environmental quality, reduce waste disposal costs, improve workplace health and safety, reduce long-term responsibility, show the good enterprise image.
The company has set up a corresponding mechanism, strengthen the management of waste reduction and guidance, and do as much as possible use of technology in the industrial production of no pollution and low pollution, improve printing method, technological process, the changing structure of raw material and printing quality, to avoid any waste, to achieve the purpose of reducing pollution.
Green design
The pollution in the process of printing is mainly produced in the link of work, so the company pays attention to the printing
Packaging and printing
Packaging and printing
The green design of control and improvement. Now there is a trend, special performance on gifts and health care products packaging, some enterprises in order to improve the sales price of a commodity, often on the packaging materials and printing, packaging and printing to all its beauty and use the best material, most of the process, multiple anti-counterfeiting, glazing, film coating, etc., this creates excess in printing and packaging. A for limited resources and energy is a kind of waste, second also increased impact on the environment. Also adds to the cost of packing and eventually increase the burden of consumers.
Environmental protection in order to more responsibility, in the decoration design and originality, the author try to guide the customer companies use substrate itself, color, texture and luster, avoid excessive full printing, printing design, and implementation of pollution-free liquid purification technology of flexible print edition, in the case of meet the requirements of decoration to minimize the use of traditional polishing, laminating, etc, and try to reduce the packaging materials, reduce the difficulty of the printing after recycling waste, reduce the pollution of the printing on the overall.
The part of the product to moisture, waterproof, prevent oil technology, in order to meet the needs of customers, the company through research and development use carton water splashing water, waterborne glazing oil instead of coated technology in the past. Because carton splashing water, glazing oil almost does not contain solvents, organic volatile emissions is less, thus reducing the production cost, reduce the air pollution, improve the working environment, also control the fire hazards. And moisture-proof, waterproof, prevent oil effect as other traditional polishing effect, and the advanced technology of low cost. So suggest use laminating process less as far as possible, because it will be like we usually use the plastic products cause white pollution, in addition to this, after coated paper also cannot be recycled, the waste of natural resources also caused certain environmental pollution.
"China printing into the era of environmental protection", in the fierce market competition, printing enterprises should, at the same time as development environment on the important agenda to be same with the enterprise economic coordination, guarantee the healthy and long-term development of the enterprise. Through continuous efforts, the company has obtained the good effect on the environmental protection work, the enterprise can be in harmony with environment, profit is not necessarily to be produced in the products, improve the environment, for the healthy development of enterprises is the real profits. Proved the environment can be in harmony with the enterprise, we will continue its efforts to promote the harmonious development of environmental protection of the enterprise, also for the construction of green environmental protection and harmonious "dragon's tongue" due contribution to the printing industry.
Matters needing attention
One, the bar code of the function and application in packaging and printing
Bar code is a kind of automatic identification information code, due to its high data acquisition rate, high reliability and low cost etc, in many books, stickers, product and packaging should be widely. Bar code is composed of a certain length, size is the number of lines and symbols, can by photoelectric scanning devices to read computer graphic language. Bar code is a research and development in recent years of data input technology and automatic identification technology, can reflect the business category, manufacturer, weight, amount, date of production and circulation between a lot of information, such as in the production, sales and storage of goods and the communication plays a significant role, contact is the world's production manufacturers, exporters, vendor and customer.
See barcodes are on the market at present early one-dimensional bar codes, with the development of very large scale integrated circuit technology, for one dimensional barcode information capacity of small defects and reduce bar code size, improve the ability of resistance to pollution, and the research developed a 2 d barcodes (hereinafter referred to as 2 d code), make the area of the bar code smaller and smaller, has been greatly improve the function of bar code reader, read more precision, increase the storage space of the bar code. In addition, also can be used in two dimensional bar code encryption technology, make merchandise anti-counterfeiting performance significantly improved. According to different structures, the two-dimensional bar code can be divided into two kinds of stack type and matrix. On printing, not only can be printed black on white paper, color printing, the printing machine, printing object informality, data read from line to face even can rotate 360 °, and can be used fault correction function, can make the barcode have been stained or damaged to recover recognition, misreading rate was 6100 per several, two-dimensional bar code also has a large storage capacity, loss of resistance is strong, high safety, can be good concealment of the fax and copy, data, information follow products, etc.
With the development of science and technology, is now developed a variety of new type of bar code, such as invisible bar code (including cover type stealth, invisible ink and light chemical treatment of invisible barcode bar code), the metal bar code, the watermark magnetic code, etc., they have enhanced the depth and breadth of bar code applications.
Second, the bar code technology requirements
Original negatives of printed bar code must be through the international or national center registration code and distribute. To make the bar code can be bar code identification device to properly identify, require barcode line is straight, not break line, line edge to smooth sharp, cannot appear jagged, conform to the standard distance between the lines, line blackness want foot, contrast. Technical requirements of bar code are:
(1) size scale. Bar code is usually the original printed directly, to enlarge or reduce the printing according to the technical requirements of EAN organizations, not randomly, general provisions of the zoom ratio should be controlled in 80% ~ 200%. Bar code zoom ratio of printing has enormous influence on the percent of pass, when the zoom ratio is 100%, printing percent of pass is 97.3%. Zoom ratio was 90%, printing percent of pass is 95.7%. Zoom ratio was 85%, printing percent of pass is 25%. And zoom ratio is less than 80%, the printing percent of pass is only 10%. Therefore, zoom printing is best done by the provider of bar code film.
(2) color. Generally as a result of the bar code read system scanner light source is a wavelength of 630 nm to 700 nm red light source, so consider inky red light effect.
Scanner of the surface of the incident light irradiation in the different color bar code, the effect of different reflection will happen. Black ink can be absorbed completely red, printing quality of incident light reflectance under 3%, is the safest ideal bar code coloring; White ink to the red light will be fully reflected, the printing quality of incident light reflectance close to 100%, is one of the safest blank coloring, so usually print bar code into black and white monochrome. But in packaging and printing, in order to increase its adornment sex, often can choose other color bar empty collocation, would then pay attention to choose appropriate collocation according to color red light effect. On red light reflectance high such as yellow, orange and red color, with red light reflectivity low green, violet wait for color. As long as can meet the bar code of reflectivity, shot density and its printing contrast PCS value requirements of any colour collocation, all bar code printing color design is reasonable.
(3) the requirement to the substrates. In terms of the optical properties, in order to ensure the scan light 15 ° 45 ° Angle of incidence and reflection, substrates with good light scattering properties. In terms of material, paper substrates general with the white base is empty white paper itself, for paper whiteness, opacity, glossiness, have certain requirements. Whiteness requirement is to make the paper surface has good reflection ability; Requirement is opaque to prevent incident light through the back of the paper and reduce the light signal, results in the decrease of reflectance; Require low glossiness is to reduce the number of incident light mirror reflection effect. For transparent or translucent printing carrier, should be banned and package contents (especially liquid contents) of the same color as the color, in order to avoid the color of the contents deepen color space and color to the color close to make empty, reduce the PCS values.
The problems in the practical application often overlooked, such as in blue or green transparent liquid packaging printing white, deep blue or green bar code, the contents of blue and green will make white space is light blue or light green; In black - transparent white space and black of the bar code printed on the package, the contents of black white space is light grey. The white base printing ink concentration shall be deepened, make content color won't passes from the base color, or change the collocation of color, avoid the above phenomenon. When the packing decoration design color and barcode design yan
Color, the bar code design shall prevail, modify the packing decoration design color. When the carrier light-leaking through color, should take the following measures: open up a piece of color the same as the empty color, area is large enough, enough thick ink gezer special printing bar code; If the bar code printing on the back of plastic membrane pincer-like device and has the decoration part, should be two layers of the sealing between the opaque interlining, to ensure that the packaging color will not affect the bar code on the back PCS value. Use reflective materials such as aluminum foil as a carrier, can play MAO process ontology color or covered with a layer of white, yellow, orange color is empty color, with black, dark blue, dark green, dark brown is the color printing bar code; Article also reflective material ontology for the color to white, yellow, orange, red is empty color printing bar code, known as the white printing. The principle of reverse printing is still based on the color design can meet the provisions of article and empty reflectivity, reflection density and corresponding value of PCS. To the requirement of substrate dimension stability, should choose good weather resistance, mechanical size stability, good color, ink extension after moderate moderate, low permeability, smoothness and finish of the material. The paper coated paper, offset paper, white board paper, two-way stretch polypropylene membrane of plastic and metal in the aluminum foil, and tin are barcode logo better substrates. And big packaging often use corrugated board because the surface is not smooth, ink have different permeability, may lead to larger printing error, so in addition to the large ratio of EAN, UPC and ITF yards, generally does not directly as substrates, but using paste printing labels. Tinting strength of nonpolar groups in polypropylene membrane and dimension stability of woven bag as the substrates of bar code identification.
(4) to the requirement of printing ink. When the ink color is tie-in, want to consider the color of ink. Ink color had a great influence on the precision of the bar code. In theory, as long as according to the color matching use ink can meet the requirements of the barcode, but due to the printing ink exist hue impure defects, color phenomenon happens, such as blue ink because of the red light absorption, can cause red light reflectance increases, reduce PCS value of the bar code. So should strictly control the ink color, make the ink density uniform, hue, saturation, high purity, best before printing magnetic bar code to determine whether some kind of ink under red light reflectance is achieved.
Metallic ink's luminosity and luster will cause specular reflection effect, and therefore cannot be used for bar code printing. Due to the barcode printing is printed on the spot, the printing house can achieve reflection density and optical properties of ink and ink layer thickness, in the process of printing, printing quality of reflection density increases with the increase of thickness of ink, when the ink thickness reaches a certain value, the density is saturated, so it is important to pay special attention to the concentration of ink and ink layer thickness. Different printing ink layer thickness have bigger difference, offset printing is 2 mu m ~ 4 microns, embossed 8 microns, 10 microns flexo, gravure 12 microns, screen printing can be up to 30 microns.
Can be calculated according to the test, the above types of printing the field reflection density can reach more than 0.3 printing quality, combined with black, green, blue, green wait for color to full absorption of red light, so using the above several kinds of color printing process printing bar code, reflectivity can be achieved. Bar code printing ink viscosity shoulds not be too big, and should pay attention to in the printing ink and printing pressure. Large amount of ink, printing substrates can't completely absorbed in a short time, will spread out in the surface of substrates, decreased accuracy; For the small amount of ink and no lines full appear even the phenomenon such as broken stroke; Printing pressure, printing ink shear stress increase, liquidity is bigger, will cause the ink spread out on the one hand, on the other hand, between the plate cylinder and embossing roller embossing area wider, can cause the barcode a wider. These will affect the bar code printing precision, so according to the different way of printing, the rheological properties of different ink and ink absorption performance of substrates, adjusting control ink quantity, printing pressure, printing speed and other factors.
Three, barcode printing quality requirements
Bar code symbol is read by a computer, which requires the high printing quality, the main influence factors are printing method (divided into contact printing and non-contact printing), printing equipment (with inkjet printing, lithography printing, thermal printing, printing, printing, etc.), printing locations (with live printing and off-site), etc. A lot of equipment to complete the printing bar code, and most of them adopt computer control, easy operation, reliable work. With the equipment at the scene to implement printing bar code has a certain amount of anti-counterfeiting features, but the anti-fake effect there are big differences between the various models, different printing equipment generally have different anti-counterfeit effect. For barcode printing quality requirements, in many national standards have specific provision. Mainly include:
(1) to print the barcode should be neat and clear and the operator has no obvious deformity, empty without excess residual black spots. Usually specified defect and stain diameter should be less than or equal to the narrowest line 0.4 times of the nominal width of the bar code; Or defect, stains of area of not more than 0.8 times of the width of the narrow a nominal diameter of the circle area of a quarter.
(2) the control bar code symbol size error. This is to improve the device first read read rate, reduce the decoding error rate (rate of course). Under general conditions, the printing tolerance is 45% of the total error, reading device tolerance is 55% of the total error, and bar code of basic size tolerance also varies with different magnification.
(3) the optical characteristics of bar code symbol. To read, reliable and after printing, bar code in the line and empty should have obvious contrast, its reflectivity should as far as possible big open space, and the reflectivity of the article shall be small as far as possible, PCS value shows that the greater the contrast of bar code signal, the greater the performance can be read, the better.
(4) the requirements for printing tolerance. Because of printing equipment, printing edition and defects of printing ink and so on, will cause the bar code printing when there is a deviation, the allowable deviation is called printing tolerance. In the printing must be strictly controlled, to ensure its not influence the effect of read range.
(5) control edge roughness. Edge roughness refers to the barcode edge roughness, indicates that the element longitudinal size is different. To edge roughness requirement is that, in all possible scanning track, element width can comply with the requirement of printing the size of the tolerance.
(6) ensure that the ink layer thickness and color fastness. The bar code, and empty ink layer
Within a certain range of thickness to control (< 0.1 mm), otherwise you will because of article and empty in the different scanning plane, which might affect the accuracy of bar code to read. In order to ensure the enough small thickness, should choose good ink uniformity and invasive, and pay attention to the printing ink and printing matching performance of the substrates.
Bar code printing substrates must have enough color fastness to make the bar code scanning after reading many times, still keep a certain contrast value, obtain reliable input signal. Substrates of color fastness test method is to use absorbent cotton rub after 5 times in the bar code, then a visual inspection and automatic detector for bar code coding respectively, the size of the symbol error and contrast values were determined. Requirement for bar code printing position should be in accordance with deformation and easy to read, easy to printing for the guidelines. As selected in the commodities packaging on the right side of the main display surface, and connected to the main display surface of the plane, the main commodity packaging on the back of the display. For different forms of packaging, bar code printing position selection has certain requirements, such as box packing, the best bar code printed on the bottom surface, avoid printing right in the middle; Best rectangle box packaging, bar code printing in the bottom of the middle of the long side. Canned, bottled, below the best bar code printing at the side of the label paper, bar code symbol shall not exceed 30 ° surface curvature, packaging container if the diameter is too small, bar code symbol should be arranged to turn 90 °. Best barrels packaging, bar code printing on side, the side can't printing, cover can be printed on the packaging, but not more than 13 mm deep. If the packaging is easy leaking liquid, bar code shall not be printed on the lid. Bag packaging, a bottom and bottom is big enough, the bar code should be printed on the bottom, or can be printed at the back below the central; Bulky bags, bar code printed on the back on the right side lower part, but should be avoided in the low position, to prevent distortion bar code; No bottom small plastic bag or paper bags, bar code printing in the middle of the bottom on the back. The central joint, such as the back is printed in the lower right or not buckling, deformation after filling; After vacuum packaging vacuum packing bag close to surface of content, is in the shape of irregular solid surface is not smooth, can cause deformation of bar code cannot read, so in the vacuum packing bag should not be direct printing bar code, can increase a package printing bar code and other graphic. Blister packaging, bar code printing on cardboard, best and protruding from the height of the cardboard packaging shall not exceed 12 mm; Protruding from the height of the cardboard packaging is more than 12 mm, bar code should be on out packing in the distance as far as possible. The position such as listed in other parts of the commodity bar code printing. In the puzzle, the direction of the bar code should be consistent with the direction of the printing, make the deformation occurred in the height of the bar code on the bar code, and does not affect the bar code width size, does not affect the reading accuracy.
Four, screen printing bar code should pay attention to the problem
Screen printing is all print method of bar code technology is a relatively simple, to ensure the quality of barcode printing, printing process to improve the printing technology and skills. Normally, 22.5 ° stretched mesh method is used, namely mesh warp/weft direction and net frame side Angle is 22.5 °. Diagonal tension method can effectively reduce the mesh to ink block phenomenon, prevent disconnection. It is advisable to screen to select 300 mesh, the mesh is too low, mesh wire diameter is too big, will keep out ink leakage, the mesh is too high, ink deposition quantity is too small, barcode contrast is too small; Sensitive glue coating thickness to thicker, should reach at least 8 microns, which is the key to improve the contrast and clarity. Film thickness gauge, when the thickness is measured is available, use a diameter of 30 mm sheet metal press on the screen, first make the uncoated photosensitive glue area contact sheets, the thick film gauge head alignment sheet metal press on the screen, read reading on the LCD screen can be () before you pay attention to in the measurement. Again in the same way to measure thickness of coated photosensitive glue after screen, the difference is the thickness of the rubber. Film thickness gauge can effectively control the operating process of randomness, is advantageous to the work of enterprise standardization, and data.
Processing in the process of network printing edition, the net is directly related to the combination of sensitive glue and screen fastness. Before to skim, available net net paste grinding methods will screen submerged, dip in with the brush grinding net paste in the silk screen printing surface brush back and forth about 5 min, not too big, hard brush, placed about 3 min, let the grinding paste fully penetrate the wire diameter, then use to skim degreasing fluid. Quite a number of companies are using household detergent instead of degreaser remove oil online, it is not correct. Because household detergent with a breeding sheep fat ingredients, it is a kind of softening agent, performance is more moderate, can protect the skin from damage; But it is also a kind of isolating agent, the coarsening isolates powder and active ingredients of the degreaser, influence grinding mesh coarsening effect.
Determine the net processing effect when can remove the screen again submerged, scraping board face a layer of water and printing surface evenly stranded suede, coarsening processing good, local water cannot appear suede, coarsening is not completely, but also to. High quality screen embodies the scientific process steps and the unity of the perfect mode of operation, from the perspective of the development of modern printing technology, or completely change process steps, or optimize the operating mode. As employees shall gradually specification according to the practical experience and change the unreasonable operation mode. Plate making employees sometimes do not take the network version of the drying, after processing think that as long as get the moisture on the screen. So to avoid using hand screen, with blower nets version or the wet screen directly into the oven, and wipe dry with a towel is not the right thing to do. These practices can't say that can cause fatal influence to production network version, but it does go against the drying of screen. First of all, the screen after processing, the moisture on the screen has a strong adhesive force, especially the moisture inside the wire net hole don't fall, shaking blowing opportunity to destabilize screen above the temperature of the area; Second, there is dust in the air, hard to avoid can have particles into the screen on the surface, don't wipe clean with a towel the moisture inside the mesh, the wet screen directly into the oven is wrong, it can make the drying process is long, more important is can damage the thermal stability of the screen. , with good water imbibition towel soaked in water, then dry, rolled up into a tubular, spread on the silk screen printing, use the principle of capillary suction to the moisture on the plate, so repeatedly, this method is to use towel to wipe dry and friction movement of silk screen, the effect is better. Only after screen surface without visible moisture, into the oven to dry, drying temperature around 40 ℃, should make evaporation network version of the drying process.
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