Luxury Comforter Sets

Packaging the rational use of offset blanket

Offset printing process control in the packaging, printing pressure is one of the more complex technology. Offset the pressure from the blanket and the compression liner material arising from elastic deformation. Therefore, the rational use of the blanket is to control the offset stress a priority. Blanket is essential for the production of offset printing packaging is an important raw material, one of the reasonable use of the maintenance can prolong the life of blanket to reduce production costs. At the same time can guarantee the print quality requirements offset package. Here to talk about the characteristics of the blanket and the rational use of such issues.

First, the types and characteristics of blanket

Currently in printing blanket used in common can be divided into: air-cushion-type blankets and ordinary type Blanket 2 major categories.

Common type blanket, it is by the end of cloth, elastic rubber adhesive and surface layer composition. As the rubber itself has the characteristics of the volume can not be compressed, when the compression of the surface layer, it will cause in the imprint area around the convex hull.

The convex hull of this phenomenon makes the offset of the embossed contact area after the week ahead at half maximum on the arc through the (convex hull of Department) and the smallest semi-through (arc midpoint) a big difference. The result was blanket cylinders and plate cylinder between; and blanket cylinders and the impression cylinder when the sliding between the imprint increased to the point that dot gain distortion, making the transfer of the entire graphic print quality.

    In addition to the end of air-cushion-type blanket fabric, elastic rubber adhesive, the surface layer outside the surface layer is also to increase the micro-porous layer of foam sponge. Micro-microporous foam layer is formed by numerous tiny closed air layer of the ball dispersed. When the blanket the surface layer under pressure, the micro-bubble in the air the ball under pressure, reduce the size of their own, so blanket only given rise to vertical compression. Variants are no longer around to the imprint area on both sides of the development. In the embossing process does not generate the convex hull of the phenomenon. Thereby reducing the time of sliding in the imprinting situation.

    Network transfer and the transfer of the entire graphics high accuracy. In particular the transfer of multi-color offset press outlets expansion rate could be reduced. Tone and color correctness of the high reduction. Allows greatly improved the quality of printed graphics. As the air-cushion-type blankets are porous layer, so it is better than the ordinary type blanket sensitivity flexibility, reversibility, and impact resistance. Multi-color offset press in the printing pressure can make the pressure stability. Of course, air-cushion blanket and ordinary blankets bring costs in terms of price increase.

Common type blanket it can be offset in the monochrome printing or in the field to use. Generally soft cushioning material is used, printed some ordinary printed matter. Because relatively speaking compressed print a large amount of network expansion rate as well. If it is multi-color offset printing, generally using air-cushion-type blanket with neutral or hard liners such amount of compression is small, dot gain little. If the cushion pad of soft material used to make blanket bag lining, then the amount of compression will be a whole big, dot gain easy spreading. So it will offset the air-cushion blanket itself, the advantages of high precision network transfer. Therefore, we should also note that while the use of blanket lining package with the nature.

    Second, the rational use of blanket

1, correctly tension Blanket

Blanket must be properly fastened under tension force on the blanket cylinders. If the blanket stretched too loose, the imprint would have squeezed out when the displacement can not be reset in time. Will lead to ghosting blanket failure occurred, of course can not be over-stretched too tightly. The blanket will lead to tight layer thinning, flexibility to reduce and eventually to have enough pressure. But also accelerate the aging of blanket, so that the transfer of ink undesirable phenomena occur, affecting the quality of products, but also shorten the life of the blanket.

Fastening the rubber blanket cylinder on its own will produce tension within the stress and tension it to compete. Internal stress will be gradually extended over time by Mino. So that tension decreased. This is called a blanket of stress relaxation. Stress relaxation demonstrated in particular in the new-for-a blanket on. So the new can not be a blanket in the facelift, when stretched too tightly, to co-pressure printing for some time, once again tightened. This must be repeated until no 2 ~ 3 times. Can the phenomenon of stress relaxation weakened, blanket degree of tension remained stable over an extended period.

2, the correct measurement of Blanket

Offset, the printing pressure is usually the size of the drum with bag lining pressure on the blanket together, the maximum amount of compression to represent. Its unit is mm. Therefore, the proper measure is to calculate the thickness of the lining package printing pressure on the key. As the tension on the blanket in the drum, elongation, will result in reduced Pu layer thickness decrease.

Therefore, in the absence of blanket to blanket cylinders mounted on the states and installed in the blanket cylinders, this two kinds of state of the measured thickness values are not the same. Therefore, to correctly calculate the bag lining the value of a good blanket is best measured by the instrument barrel.

But at present a lot of printing, and not equipped with cylinder through the instrument. Is usually measured with the micrometer thickness of blanket and liner material. As the micrometer is not installed in the drum blanket state of the measured data, so the operator should blanket installed on the drum after the tension is not installed prior to the thickness and the thickness of the poor, there must be a correct estimate. Greater pressure in order not to appear bias. Relatively speaking soft liner over the pressure differential impact on smaller, but more than for the rigid liner pressure differential impact on the larger.

3, blanket installation

Should pay attention to correctly distinguish between the use of blanket blanket of the latitude and longitude direction. To blanket around the cylinder through the axis in order to achieve printing results. Because it is not easy blanket stretched variant. Easy to stretch the blanket side of the zonal type. Therefore, the direction of blanket silk strand must not be blind to install. General blanket behind a clear sign silk strand, if a red or blue warp, with the warp on the roller axis perpendicular to. Blanket cut, we should pay attention as being from the type, on both sides of the same length. Into wooden planks on both sides should be parallel. Then the blanket taut, it will not side of the tight and loose side.

Also note that the center distance of rollers on both sides must be equal. Otherwise, they may make blanket cylinders relative to the impression cylinder or a printing plate cylinder axis is not parallel to the side of the pressure blanket big forward drive, the other side of the pressure on the small forward in time more slowly, the most general to make rubber cloth produced reverse. Makes the print outlets variant of the poor quality of Indian goods.

4, blanket cleaning and maintenance of

Over a period of time printing, the blanket surface because of physical absorption, adhesion of many paper wool, paper powder and ink skin accumulation. If there is no timely cleaning of thick paper paper hair powder, it will increase pressure on local printing. Blanket occurred there makes more of plastic deformation. Will accumulate over time at local depression. Therefore, the printing paper produced hair, paper powder, paper, ink skin and so on, for special attention to timely and clean water.

Blanket with a light and heat aging characteristics. The blanket purchase black paper packaging should be stored in a cool place. Blanket cleaning faster due to use of volatile solvents. If the volatile solvent slowly make blanket blanket wash solvent and then aging accounts. Therefore, a solvent wash cloth rubber skin will certainly need to clean. India and exhausted for a particular product, if encountered in a long time to shut down, to release the blanket of the tension device, so that blanket to relax, have a preventive effect of stress relaxation blanket.

In short, the blanket will offset the packaging materials used in one, and it offset the quality of products have great impact. As a packaging and printing workers, not this half-hearted, will Xu arouse our attention. Work, especially in peacetime continue to be studied and analyzed. At the same time to sum up the experience, but also to consult my colleagues around, so that blanket to get proper and reasonable use.
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