Self-adhesive die-cutting processing common problem resolution

The non-drying label in addition to the need to be printed in the production process, die cutting process is also very important. The so-called die cutting just like use knife to cut into adhesive materials need to the shape of the process. Da cutting process is more to cut half wear of self-adhesive materials, i.e. only cut through adhesive material and glue on the surface and not cut the bottom paper. The vast majority of cases after to die cutting molding adhesive materials and glue on the surface will don't need waste eventually leave need to part. Now commonly used in die cutting process have die cutting and circle pressure circle die cutting in two ways. The flat die cutting can even can extension processing and machining circle pressure circle die cutting is the machining. Give us the die cutting processing under the common problems and solutions in the process
A, labels, along with the waste edge is brought up
Tag along with the waste edge is brought up the phenomenon commonly known as "fly". Lead to this phenomenon mainly have the following reasons:
1, die cutting
When the die cutting knife not completely cutting wear adhesive material surface is easy to appear when waste sideband on tags. Die cutting continuous label was caused by the waste phenomenon since the sideband is very regular, is basically the label location tags together with waste edge adhesion phenomenon. If it is a multimode die cutting problems of die cutter location is fixed. The generation of this kind of problem is mainly due to the die cutting knife breakage, die cutting pressure uneven.
Die cutting is self-adhesive materials continuously the most prone to the problems in the process of die cutting processing, and more simple to solve, only need to replace the broken blade or adjust the die cutting pressure can solve. Here to pay special attention to is that sometimes some parts of the die cutting knife will wear due to uneven pressure than in other parts of the severe, although the tool surface when using this tool die cutting labels without obvious damage but also prone to die cutting phenomenon. Determine whether due to tool wear and tear caused by severe local die-cutting constantly approach is to look at the bottom paper, die-cutting concentration if there have been obvious indentation on the undercut and the surface is broken when circumstances should consider when change for die cutting knife blade.
2, self-adhesive materials surface and bottom paper mold force is too small
Self-adhesive materials surface and bottom paper called mold forces, if the mold power of self-adhesive materials is too small and easy to cause the label with the waste sideband phenomenon. Because in the process of die cutting processing would inevitably have glue wiredrawing phenomenon, at the same time waste edge in the process of being pulled to label a take up power, if the mold self-adhesive materials tensile strength of the force is less than the waste edge of label, it is easy to appear "fly standard" phenomenon.
General die cutting due to mold force problem "fly standard" phenomenon mainly by raw material production enterprises adjust the adhesive force of mold to solve. Printing if you encounter this kind of situation, can appropriate by improving the processing temperature or increase the Angle of waste way to solve the problem, the need to change the material when necessary.
3, the label area is too small or special shape
Tag area is too small or complex shapes (such as a pentagram label) is not easy for automatic exhaust, such problems can try to increase the Angle waste discharge to solve the problem (iron or iron ruler can be used in place of the waste discharge roll, make waste Angle greatly increase). Need to manually waste when necessary.
4, glue reflow result in die cutting
For a lot of hot melt adhesive or thickening of the glue adhesive material, glue in the process of die cutting in is very easy to return to adhesion after cutting wear together, lead to serious glue wiredrawing phenomenon in the process of making die cutting labels were waste sideband phenomenon. Encounter this kind of problem, can lower the temperature in the die cutting processing of proper way to reduce the glue backflow. Must keep the die cutting knife sharp at the same time, so that you can instantly make knives cutting wear reduce glue back glue layer. If it is even the cutting processing in the right way to improve printing speed is used to reduce the glue backflow.
5, processing temperature is too low
In winter many label printing enterprise's production and processing temperature is very low, cause frostbite glue adhesive materials. Make the self-adhesive materials mold force greatly reduced in die cutting "fly". Encounter this kind of situation will be expected to raise the temperature of workshop, general winter temperature shall not be less than 15 degrees above freezing adhesive processing workshops.
6, the waste discharge way is not reasonable
The way waste is not reasonable and easy to cause die cutting "fly". Main show is: waste station and die cutting station far away from to glue back cause "fly". Waste roller diameter is too large lead to small exhaust Angle lead to "fly". Encounter this kind of problem can by adjusting the discharge location and distance of die cutting station, and the diameter of the roller to solve.
Second, the waste edge fracture
Waste edge fracture is often encountered in the process of die cutting processing problem, if often appear in the process of processing waste edge fracture phenomenon will influence the production efficiency very much. The cause of the die cutting process waste edge fracture has the following points:
1, waste carefully vertical or horizontal waste while ratio
If the waste edge to go can't afford to waste roller tension fracture phenomenon can occur easily. Normally suggest the non-drying label waste edge width between 3 to 5 mm. At the same time, if the label waste edge width ratio of the transverse and longitudinal (such as horizontal indulge narrow) lead to waste not balanced stress also easy to cause waste and fracture.
2, the label edge Angle
If the label for right Angle is very easy to cause waste edge fracture, because waste by pulling force is relatively concentrated, on the contrary if the label edge is rounded the waste edge by the pulling force is relatively scattered is not easy to break. In case of edge for rectangular label can use effect of the way to solve the problem of waste edge easy to fracture.
3, tags, special shape
Some alien tag because its shape is special, such as a star label, trapezoidal label and so on, led to the waste edge shape is irregular. At the edge of the waste process waste uneven tension is also easy to cause waste edge fracture. Encounter this kind of problem can be in the process of waste to stress smaller part padded paper to balance the waste roll pulling force. When necessary, you will need to manually exhaust.
4, die cutting knife interface
If the die cutting knife bad interface can lead to the edge of the waste and there is a small burr or edge, if waste edge is fine or waste roll pulling force is very easy to cause waste edge fracture.
5, waste roll diameter
In general, waste discharge roller diameter small package Angle is large, waste side by the pulling force is relatively larger. Instead, waste roller diameter exhaust Angle is small, waste discharge side of the relay is also relatively small. So for some waste edge is fine, if waste roller diameter is relatively detailed rules will waste edge snap easily. Such problems can be settled through increasing the diameter of the waste discharge roller.
6, self-adhesive materials
Some adhesive materials own mold force too or uneven edge coating silicon may also appear waste edge fracture phenomenon. The edge coating silicon phenomenon is easy to find, while type material itself from excessive force to try to uncover the adhesive surface with the hand, if feel very difficult jie is likely to be away from the force is too large. If it is not obvious is by changing the material to determine whether waste edge fracture caused by mold force problem.
Three round, round pressure die cutting knife version of bad cooperation with the plate
Main show is live after printing die cutting molding, when the heads vary widely. Sometimes sometimes head small tail leg, head small to big, and there are laws in the knife version of the relative position gradually move from top to bottom. And after inspection found films and knife version of dimension precision error within permitted range. The causes of this phenomenon are the following:
1, the edition and version of the roll on not close
Because of using stickers printing is the way letterpress printing when the resin version with double-sided adhesive coated the version of the surface of the roller. If the plate is not very good on the version of the surface of the roller, become warped on the version of the outlet, relative to the die cutting knife plate shorter version. No can solve this kind of phenomenon caused by the die cutting will play roll plate after plate to plate and better on the version of the roll surface.
2, version of the hard and soft degree can also affect the die cutting
PuLin too Joe resin version, for example, according to its shore hardness can be divided into different KF, EF, SF, UF, and many other types. The more commonly used for KF and EF. The shore hardness of 65 and 55 degrees respectively. Using different hardness of pressure in the process of printing plate deformation degree is different, so also will affect the precision die-cutting.
3, the effect in the process of plate making
Need exposure on resin version in the process of plate making and drying, drying the length of time to decide how much to the version in water. Relative water content of less water content of many editions of slightly long, sometimes start to printing and die cutting with the version with die cutting knife is very good, in the edition version after a long problem, can be solved by again will version drying method.
4, the pressure of the printing
If the pressure in the printing process will lead to resin version by extrusion, die cutting and printing between sets of a is not allowed. Especially the version of the material under the condition of soft this kind of phenomenon is more rare.
Version with circular knife sets of the above said is allowed to the phenomenon in the die cutting accuracy requirement high electrical performance is more noticeable on the label. Some label even 5-8 mode only 0.2 0.3 mm of tolerance, usually for die cutting accuracy is not high label is not clear.