Precisely To Version Definition:

1、Between the photocopied thing(black and white negative) and the printing ink mark match precisely.

2、In the polychrome printing, refers to each kind of color between the printing mark match precisely(color to version).

3、Between the mark of the printing process beginning and the conclusion ,as well as any middle mark is accurate and consistent.

4 Including the continuous single printing unit on the printing mark keeps stable, namely, on the printing mark and the edge

Printing ink is invariable to between the version hole distance and the angle maintenance.

It is not accurate to the version, the primary influence factor as follows:

1、Silk Screen    Correct Request:

The material quality is appropriate;

Heat and dampness is not affected;

The surface treatment is stable.

2、Net Frame    Correct Request:

Using the aluminum or the steel frame, do not have to use the wooden frame;

Using the suitable structural strength section;

Between choice network frame size - - printer area and screen size ideal relations.

3、Stretches Net Machine    (Mechanical Type) Correct Request:

The cartridge fixed the silk screen;

The cartridge does not have the glue water residual;

The angle clamps easy to make the silk screen taut;

Using the suitable equipment for the net frame pre-Canada tension;

Use the tensiometer to carry on conventional tension examination;

Observe the recommendation tension requests from the Silk Screen manufacturer.

4、Sticky Net    Correct Request:

Using outstanding sticky net glue, avoiding because of the heat、dampness, and the solvent making the silk screen glide;

According to the manufacturer’s recommendation of the drying time and the exploitation condition of glue water.

5、Photo Exposure Machine    Correct Request:

Exposure Period Maintains the Best Vacuum;

A vacuum flatness is good.

6、Printing    Correct Request:

Smooth print station;

The smallest friction pressure;

The best net distance state;

The Friction Speed;

In multicolor printing is always using the same friction;

The printing ink viscosity is appropriate;

7、Working Area and the Stuation of Printing

 Relative Humidity: 55-65%, the room temperature: 18-21℃ 

The high temperature of the dried tunnel affects printing.

The reason of not checking the version precisely and the processing methods:

1、The Black and White Negative

Black and white negative is composed by a polyester layer and photographic emulsion. The black and white negatives changes accomplish the high temperature and humidity.

Usually using for manufacturing the transparent polyester film to have 0.1MM thickness. The temperature and the humidity are similar fluctuation causing the polyester film change.

2、Screen　Plate

Steel and light aluminum network frame. The net frame is quite important to guarantee the precision comparing the version.

1) Thermal-Expansion Coefficient: Each elevation of the aluminum frame temperature about 10℃;

The aluminum inflates 0.2MM/M.The steel network frame inflates only one half than the aluminum frame.

2) The Gauze Pulling Force Creates the Net Frame Twisting.

(Stretching it to reach about 20Newton/CM gauze, every 1 centimeter of the net frame exerts about 2KG pulling force, in this way, every 1 meter of the net frame exerts 200KG pulling force approximately. When using the silk screen tension to not stress net frame infliction pressure when can appear the quite big loss of tension

3) Net Frame Distortion In Different Mechanical Pressure

Flexure or distortion network frame is always bringing difficulties for the printing as well as obtaining the correct checking version．The distance between the screen plate and the accepting for printing thing are not even disturbing the friction and the even printing ink releasing. Only choosing the lateral stability can not solve the defect. But it can use the raising hauling of the net frame.

3、Using the Off-Network to Make Print Cause the Silk Screen Twist

Even before considering the friction movement to cause the silk screen move. The mark change or the distortion are decided in the distance between screen plate and the accepting for printing thing (printing screen distance)

4、Silk Screen

1）Nylon

Even if in the strong stability situation, the nylon silk-screen is not achieved the pulling taut anti- character of the polyester net. They mainly use in printing the curved surface, needing the high elasticity in this kind of printing.

2) Polyester (PET)/stainless steel U regarding to the printing version, special in large-scale printing, choosing it between the polyester and the stainless steel (VZA).

3) Silk Screen Intensity

The monofilament intensity and pulling taut anti- to increase according to the diameter square present proportion, but the silk screen intensity increases according to the item number by linear proportion. The silk- screen by the relative thick line to weave, has strongly pulling taut anti-, when printing, it is more precise to the version.

4) High Standard Polyester Gauze

Unique intensity and stable size of high standard polyester gauze enhance. in fact, they may apply in the most of silk-screen printing.

5、Accepting For Printing    The workshop and the material condition affect the size stability of the accepting for printing thing.

Weaving by several materials, the spreading cloth or the lamination compound accepting for printing thing to carry on the experiment, determining the printing ink and the solvent to bring the size change (curl/corrugation)

It’s very important to make the accepting for printing thing adapt the environment of printing room. If possible, the printing room and the warehouse air condition should maintain consistently.

1) Paper and Cardboard

a) Temperature Influence:

Only when the room temperature changes normally, there’s nearly no influence on the paper and the cardboard characteristic.

b) Relative Humidity Influence:

Making the paper and cardboard plants are absorbing, corresponding in absorbing water relies on the paper quality.

Experience principle: supposing under about 50% relative humidity working condition, 10% change can cause the accepting for printing thing appear the following size change:

---Horizontal move to the machine direction: per line meter is 0.8-1MM

---Vertical move to the machine direction: per line meter is 0.3MM or below.

2) The Plastic

Firstly, it’s essential to determine the printing foundation which is composed by the sole material or compound materials:

The change of the temperature and the humidity will make the changing degree of plastic size become big. Generally speaking, the conductivity is very lowly, the humidity absorption progresses very slowly, the plastic needs several hours or days can make the response to the relative humidity change, the temperature change causes the change is very important than the humidity change causes the change, in fact ,the latter is not very important.

The temperature changes 5℃ can cause size change (unit: MM/running meter):

--Polyester 0.135

--PVC 0.35-0.5

-- Transparent propylene 0.35

Air Adjustment

Also needing to pay attention, allowing ±2 degree and ±5% humidity tolerance, dominating the air adjustment is a very high standard to use for the silk screen printing equipment, needing the quite precise to monitor.