There are several ways to stretch the net, what are the characteristics of each, and seek the answer

Stretching the mesh is to firmly fix the wire mesh on the screen frame under a certain tensile force. And make the stretched wire mesh 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 stretch screen are directly related to the quality of the screen printing plate, and also have a direct impact on the printing quality.

When color printing, the tension of each color plate of the screen printing plate must be basically the same, so as to ensure the accuracy of the overprint. Only by stretching the net can we ensure the quality of plate making and printing.

There are two main methods of stretching netting: manual stretching and mechanical stretching.

Hand-stretching is a simple traditional method. It is usually suitable for wooden mesh frames. This method is to manually fix the wire mesh to the wooden frame with nails, wooden strips, adhesives and other materials.

The tension of the manual stretching net can generally meet the requirements, but the tension is uneven, the operation is more troublesome and time-consuming, and the quality of the stretching net is not easy to guarantee. This method is mostly used for small quantities of printing and occasions where printing accuracy is not high.

Mechanical mesh stretching is the use of mechanical force to make the screen tight, and use adhesive to firmly bond it with the screen frame. After the adhesive is dry, remove the screen frame and seal the edges with polyester film single-sided pressure-sensitive adhesive tape. to prevent the adhesive from dissolving and to give the screen plate a neat appearance.

Mesh frames of various materials can be mechanically stretched. Mechanical stretching has the characteristics of uniform tension and short stretching time. It is easy to grasp the required tension.

Suitable for plate making with high precision requirements.

90 degree angle stretch mesh is the most material-saving, and the general silk screen printing accuracy is not high The product does not need to use 45 degree and degree stretch net.

The wire mesh is at an angle of 5-10 degrees to the edge of the frame, and the plate-making effect is the worst.

Broadly speaking, stretching nets can be divided into manual stretching nets and mechanical stretching nets.

Hand stretching mesh is only suitable for stretching wooden mesh frames. One method is to use strips, nails, or adhesive to fasten the wire mesh to the wooden screen frame; Another method is to use nail net grabbing and net pulling pliers to stretch the wire mesh on the four sides of the screen frame. The tension of manual stretching the net can generally meet the requirements of ordinary printing, but usually the tension is uneven, the operation is troublesome, and the quality of the stretching net is not easy to guarantee, and it is only suitable for printing products with low printing accuracy.

Mechanical stretching can be divided into two types: direct stretching and indirect stretching. The direct stretching method is to fix each side of the wire mesh on the stretch net fixture, and the screen frame is placed on the working platform to maintain horizontal contact with the wire mesh, and then the wire mesh is tightened, and after reaching a certain tension value, the wire mesh is glued and the wire mesh is glued with the adhesive mesh. The indirect net stretching method is that when the mesh is stretched, the wire mesh is not in contact with the screen frame, and the screen frame is held up with a platform after the wire mesh is tightened, so that the wire mesh and the screen frame are in contact with each other, and then glued together.

The indirect net stretching method is suitable for stretching multiple screen frames at the same time, but the tension weakening degree and speed of indirect stretching are greater than that of the direct stretching method. Whether it is direct or indirect stretching of the net, when laying the net, it is necessary to pay attention to the warp and weft wires of the wire mesh to be kept as horizontal as possible; For the stretching machine that cannot automatically adjust the tension, there should be a small margin at the four corners of the stretching net clamp when stretching the net, so as to prevent the wire mesh from tearing in this part. in becoming unnecessary waste; In addition, when the net is opened, the tension should be gradually increased to make the wire mesh slowly stretched and tightened.

China Mesh Printing Special Printing Network.