Stretching is an essential process for making screen printing plates. Stretching the net is to fix the silk net firmly on the net frame under a certain tension. And make the stretched silk screen have a certain tension to meet the requirements of photosensitive agent coating and other plate making. The size of the screen tension and the quality of the stretched screen are directly related to the quality of the screen printing plate, and also have a direct impact on the printing quality. When printing in color, the screen tension of each color version of the color screen printing plate must be kept basically the same, so as to ensure the accurate color printing. Only by stretching the web, can the quality of plate making and printing be guaranteed. There are two main methods of stretching nets: manual stretching and mechanical stretching. Stretching the net by hand is a simple traditional method. Usually suitable for wooden frame. This method is to manually fix the wire mesh on the wooden frame with nails, wooden strips, adhesives and other materials. The tension of the hand-stretched net can generally meet the requirements, but the tension is uneven, the operation is troublesome and time-consuming, and the quality of the stretched net is not easy to guarantee. This method is mostly used in a small amount of printing and occasions where printing accuracy is not required.
The mechanical stretch net is to use mechanical force to make the wire net tight, and use an adhesive to firmly bond it to the net frame. After the adhesive is dried, remove the screen frame and seal the edges with a polyester film single-sided pressure-sensitive adhesive tape. In order to prevent the adhesive from dissolving and make the screen printing plate clean and tidy. The net frames of various materials can be stretched by machinery. Mechanical stretch net has the characteristics of uniform tension and short stretch time. Easy to grasp the required tension. Suitable for high-precision plate making.
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