Blanket is the intermediate carrier for indirect transfer of graphic and text in the offset printing process. It is one of the main consumables for offset printing. The quality of the blanket is directly related to the quality of the printed product. Even if it is a good quality blanket, if it is used improperly or it is not stored well, it will also affect the quality and service life of the blanket. Therefore, it is also very important to properly use and properly maintain the blanket.
The correct use of blanket
When using a blanket, if there is no new sheared blanket, the first thing to cut is to use the marking line of the blanket as the direction perpendicular to the axis of the roller. Otherwise, the elongation and thickness of the blanket will change. Ruggedness and other indicators, reduce the life of the blanket, but also affect the quality of printed products. At the same time when shearing, the directions of the shearing lines of the trailing edge and the cornice must be parallel and the lengths are the same, and the forces will be the same when tightened. Otherwise it will cause uneven printing pressure. The outlets are empty.
The pad of the blanket must be narrower than the blanket so that when the blanket is tight, both sides of the blanket can be tightly wrapped around the surface of the roller to prevent materials such as magazines, cleaning fluids, and water from penetrating both sides of the blanket. The surface of the blanket cylinder causes problems such as oxidation and rusting of the cylinder and delamination of the blanket.
Tighten the blanket, we must pay attention to eliminating the impact of friction on the back of the group, can not only pull a short section of the tip, mouth side also close at the same time, and the pull and pull the same mouth pull, blanket can be evenly tight Packed on a roller.
After the new blanket is installed, the surface of the blanket has a smooth anti-oxidation film, which must be scrubbed with gasoline or kerosene cloth pumice powder before use to ensure that the surface of the blanket has good lipophilic properties.
Care must be taken when cleaning the blanket. Do not allow the ink to remain in the pores on the surface of the blanket, otherwise the oxidized conjunctiva will become dry and solid over time, resulting in a bright film on the surface of the blanket, which will reduce the ability to absorb the film. If there is a bright film, it can be scrubbed with clean water, and then wipe it with gasoline or kerosene cloth and pumice powder. It can also be cleaned with a special cleaning agent.
If the blanket has a slight embossing phenomenon, or the transfer performance of the ink is reduced, it can be wiped with a blanket, and then wiped with water or a damp cloth, which can restore the elasticity and printing performance of the blanket.
Storage of blankets
Whether it is a blanket on a roller or a blanket without a roller, do not allow the blanket to come in contact with various oils, acids, alkalis, salts, chemicals, etc., and do not crush it so as not to damage the surface and damage the blanket. Its elasticity; rubber is not afraid of light, heat and moisture, which will make the surface of the blanket sticky, crusted, cracked, hardened or fabric mildew and so on. The new blanket is best placed in a closed container, or in a well ventilated, dry place, the indoor temperature is controlled at 20%, the relative humidity is best at about 70%, if it is a good cut rubber blanket is best The plastic surface is flat on the plastic surface, and a layer of talc powder is coated in the middle. Do not apply sulphur powder. Otherwise, the surface will be hardened and brilliance.