絲印制版主要運用的是感光制版法的間接法。它是應用感光漿的化學變化,即感光漿受光局部產生交聯硬化并與絲網結實分離在一同構成版膜,未感光局部經水或其它顯影液沖洗顯影后構成通孔而制成絲網印版的。
The indirect method of photosensitive plate making is mainly used in silk printing. It uses the chemical change of the photosensitive paste, that is, the photosensitive paste produces cross-linking hardening locally and solidifies and separates with the screen to form a film, and the non-photosensitive part develops with water or other developing solution to form a through hole to make a screen printing plate.
應選擇與相版相配的絲網擦凈,用洗凈,用水重復沖洗,涼干待用。然后將分配好的感光漿平均地刷涂在絲網上,將網版放置于60-65℃的烘箱內,烘10-13分鐘,再將感光漿平均地刷涂一遍,在烘箱內枯燥后,拿出待曝光,烘干時間過長或過高會形成顯影難、脫網難,反之版膜不牢、曝光不透。
First of all, the screen matching the photo should be wiped, cleaned with high efficiency, rinsed repeatedly with water, and dried to be used. Then, the distributing paste is brushed on the screen evenly, and the screen plate is placed in the oven at 60-65 C for 10-13 minutes, then the paste is brushed and painted equally. After drying in the oven, the paste is taken out to be exposed. If the drying time is too long or too high, it will be difficult to develop and remove the screen. On the contrary, the film is not firm and the exposure is not transparent.
在曝光前應對底版作一次檢查,看底版的邊緣能否潤滑,字跡能否分明,有無劃傷、露點等現象,然后用曬版機停止曝光。在放置相版時,普通應放置在網的部位,也可依據自已的實踐印刷請求放置。在曝光過程中重要的環節是使絲網與底版嚴密地貼附,以避免曬出的圖發虛以報廢。
Before exposure, we should check the bottom plate to see if the edge of the bottom plate can be lubricated, whether the handwriting can be distinguished, whether there are scratches, dew points and other phenomena, and then stop the exposure with the plate dryer. When placing a photographic plate, it should be placed in the central part of the net, or according to its own practical printing request. In the process of exposure, the most important step is to make the screen and the bottom plate adhere closely, so as to avoid the falseness of the sunburnt pictures and even scrap them.
顯影:把曝過光的網版浸入水中一兩分鐘(30℃-40℃溫水效果更好,能縮短顯影時間),要不停地晃動網版等未感光的局部充沛吸收水膨潤后,用強水沖洗即可,等所曬制的圖文呈現,顯影應在短時間內完成。無論什么樣的網版都必需把未感光的局部完整洗凈。
Developing: It is better to immerse the exposed screen in water for one or two minutes (30-40 C warm water can shorten the developing time), shake the screen and other non-sensitive parts to absorb enough water to swell, then rinse with strong water, and so on. The developing should be completed in a short time. No matter what kind of screen version, it is necessary to wash the parts that are not sensitive to light completely.
顯影水平的控制準繩是:在顯透和顯影的前提下,時間愈短愈好。時間過長,膜層濕收縮嚴重,影響圖像的明晰度,并易流失,版膜易爛;時間過短,顯影不徹底會留有蒙翳(即余膠)形成廢版。余膠是一層極薄的感光膠殘留膜,易在圖像細節處呈現高度透明,難于分辨,常誤以為顯透,而不干膠印刷時油墨不能經過。
The control criterion of development level is that the shorter the time, the better under the premise of development and development. Over time, the wet shrinkage of the film is serious, which affects the clarity of the image, and is easy to lose, and the film rots easily; over time, the development is not complete will leave a mat (i.e. residual glue) to form a scrap version. Residual glue is a very thin residual film of photosensitive glue. It is easy to show high transparency in image details and difficult to distinguish. It is often mistaken for transparency, but ink cannot pass through when printing with dry glue.
二.由于靜電的存在,在印刷中由于靜電等所惹起的消費艱難為體,在絲印中的表現有:
2. Because of the existence of static electricity, the consumption difficulties caused by static electricity in printing are as follows:
1. 絲印后起網,印跡上油墨隨著網版一同呈毛絨狀拉起,工件取出后"飛毛"狀墨絲剛才斷開的現象
1. After screen printing, the ink on the screen is pulled up in a fluffy shape along with the screen plate. The phenomenon that the "flying wool" ink filament has just broken off after the workpiece is taken out.
2. 套印時,前一色與后一色油墨字邊和圖紋邊緣互相排擠,不能很好吻合,使兩色墨跡之間印不上油墨。
2. When overprinting, the edges of the former and the latter inks squeeze out each other, so that the ink can not be printed between the two inks.
3. 網印中,工件粘在網版上,特別粘在刮板移終點那個網版位置。
3. In screen printing, the workpiece is glued to the screen, especially to the screen position where the scraper moves to the end.
4. 承印資料粘在一同分不開
4. Printing materials can not be separated from each other
網印中由于靜電的存在能形成很多質量問題,以使印刷不能繼續下去,那么網印中的靜電又如何防止和消弭呢?
Because of the existence of static electricity in screen printing, many quality problems can be formed, so that printing can not continue, then how to prevent and eliminate static electricity in screen printing?
1. 工件自身已帶電。此時,能夠運用除靜電設備在絲印前對其外表停止去靜電處置。辦法很簡單;用除靜電設備消弭工件外表靜電即可,處置后就能夠印刷。
1. The workpiece itself is electrified. At this time, the electrostatic device can be used to stop the electrostatic disposal of its appearance before silk printing. The method is very simple; it can eliminate the static electricity on the surface of the workpiece by using the equipment except static electricity, and it can be printed after disposal.
2. 網印塑料工件帶靜電。事前可在塑料配方中增加抗靜電劑,這就請求消費塑料原料供給商完成。
2. Screen printing plastic workpiece with static electricity. Antistatic agents can be added to the plastics formulation beforehand, which requires the supplier of consumable plastics raw materials to complete.
3. 還可在帶靜電的工件外表增加一道涂布抗靜電涂料的辦法消弭靜電。
3. An antistatic coating can also be added to the surface of the workpiece with static electricity to eliminate static electricity.
4. 合理運用油墨的溶劑。即便油墨溶劑混合性能好,而導電性能好的溶劑分配油墨粘度。
4. Reasonable use of ink solvent. Even though the ink solvent mixing performance is good, the solvent with good conductivity distributes the ink viscosity.
5. 從網印設備上增加工件接地,使其電荷釋放而消弭靜電。
5. Grounding of workpiece is added to screen printing equipment to release its charge and eliminate static electricity.
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