A guy what is process?
Tension net is the first step of making screen printing plate.Stretch mesh quality has a direct relationship between the quality of plate making.So, we must seriously, carefully prepared to stretch the net work and tension net work.
Tension network according to the first printing size chosen the corresponding net frame, the screen frame and screen adhesive side to clean, if it is the first time to use net frame, need to use a sandpaper friction gently, so that the net box surface is rough, so easy to increase the screen frame and screen the relay, if it is used by the network box also want with sandpaper friction clean, remove residual glue and other substances.Net box in tension of the net after cleaning, first in contact with the screen surface coating and glue and dry.Net, tense by hand or mechanical stretch mesh, wire mesh tension after make the silk screen and screen frame tiejin, and on the screen and screen frame contact.Part coating glue again, then blow dry, pay attention to the glue is unfavorable and coating too thick or too thin, in blow dries, rubber or soft cloth are available, and edge wipes bonding part, edge to a certain pressure, make the silk screen and screen frame stronger glue.After waiting for glue dry, loosen the external tension, cut net frame around the screen outside, and then use the single side adhesive tape post in the part of the screen and screen frame adhesive, which can protect the screen and screen frame, can also prevent printing solvent or water to dissolve glue, to ensure the effective use of screen plate.With water or detergent wash silk screen, the screen dry, it can be used in emulsion coating (plate).
There are several ways tension net?What is the distinguishing feature of each?
Network is an essential part of making screen printing plate a tense working procedure.Tension network, is will screen under certain tension firmly fixed on the screen frame.And make the good screen has a certain tension, in order to meet the sensitizer coating and other process requirements.The size of the screen tension and tension network quality high and low, and is a direct effect on printing quality.Color printing, the requirement of tinted screen plate per color version of the stretch mesh tension must be kept almost the same, so as to guarantee the accuracy of the overprint.Only good net tense, can guarantee the quality of plate making and printing blocks.Stretch network are mainly manual tension net and mechanical tension net two methods.Manual tension net is a simple and traditional method.Usually applies to wooden screen frame.This method is through the artificial with nails, wood, adhesive materials such as silk screen fixed on the wooden frame.Manual stretch mesh tension generally can meet the requirements, but uneven tension, do more troublesome and time-consuming, stretch mesh quality difficult to guarantee.This method is more used in small amounts of printing and printing precision is not high.
Mechanical stretch mesh is the use of mechanical strength, make the screen tension, using adhesives with the net frame strong together.Wait for after adhesive is dry, apply the net frame, with polyester film single sided pressure sensitive tape sealing side.In case of adhesive is dissolved, and make the silk screen plate look clean and tidy.All kinds of frames are available mechanical stretch mesh.Mechanical stretch mesh with uniform tension, tension network time is short, etc.Easy to learn the required tension.Suitable for high precision requirements of the plate making.
How to choose the guy network perspective?
Tension network perspective refers to the warp and weft wire mesh (silk) and net frame edge Angle.
Guy comes in two forms, one is is stretched, the other is a diagonal stretch mesh.The narration of the two tension net method respectively.
Net, tense is silk screen of the warp and weft are parallel and perpendicular to the four edges of the screen frame.The warp and weft and 90 degrees to the net frame.
Oblique tension net, refers to the warp and weft wire respectively and certain Angle to the net frame edges.Use is stretched mesh form stretch mesh, operation more convenient, because can make full use of the wire mesh, wire scrap can be saved.Reduce waste silk screen.But, when the chromaticity printing using this form stretched mesh plate making prone to turtle grain, so matching color printing is generally not used is stretched.USES the oblique tension net to improve printing quality, to increase the leak ink also to have certain effect.Its defect is waste silk screen is bigger.In the printing accuracy is higher and the color printing, stretched network perspective of choice has a direct effect on printing quality, network point selection is not suitable for tense, turtle grain will occur.So, half copies printed, often apply the tension of net point is 20-35 degrees, in high resolution printing circuit board, due to the use of wire mesh number is higher, so the guy net 45 degrees are selected to suit.In the actual tension net, in order to reduce waste silk screen, general copy print use is stretched the net more.
How do you determine the screen stretch mesh tension?
Precision and the precision of the silk screen printing, screen printing and silk screen tension in one of the important factors affecting the quality of silk screen printing blocks.The material of screen tension and net frame and the intensity, the screen of the tree mass, temperature, humidity, stretch mesh method and so on.Usually in hand stretched the net and the absence of tensiometer, tension determined mainly by experience and decide, when stretched the net mesh stretching, while pressure screen with your fingers, generally with finger pressure screen, feel the screen have certain elasticity.
In the use of stretch mesh machine and net box stretched net, generally use the tensiometer test screen tension.
When using stretch mesh machine tension net, as a result of the movement of stretched mesh chuck (elastic debugging) is controlled by the barometer, so different kinds of silk screen, its net pressure value of different tense.Usually tulle net tense pressure value is 7 to 9 kg/cm2: nylon mesh tension net pressure value is 8-10 kg/cm2: polyester yarn net stretched the net pressure value is 8-10 kg/cm2.Stainless steel wire mesh tension net pressure value is 10 to 13 kg/cm2.
Above is several kinds of screen when stretched net pressure reference value, stretched mesh can refer to these data according to the actual situation of tension net, in order to obtain ideal stretch mesh tension.
What kind of tension net commonly used binder are there?
Stretch mesh screen and screen frame with the effect of bonding agent of tightly together.Of the twigs with the types of bonding agent is more, when selected, according to the material of net frame, silk screen, choose different bonding agent.Tension is mainly use the adhesive with polyvinyl acetal adhesive (glue) from love, ethylene perchloride glue, rubber type adhesive, phenolic, neoprene, nitrile rubber, etc.