Improvement of the integrated process of hot stamping
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Hot stamping and embossing are originally two processes in post-press processing. However, with the rapid advancement of plate-making technology, the use of electric carving technology to make a set of yin and yang versions can combine these two processes into one. However, if hot stamping and embossing need to be installed with multiple sets of electric carving yin and yang, there will be many problems and it will not be able to produce normally. The following combines your own experience in this area to introduce an improved process.
1. Problems encountered in the use of electric carving Yin and Yang version
The paper quantity of a batch of jobs is about 200g/m2, and there is a hot silver and embossing registration process. The area of hot silver and embossed surface is only 4.4cmx1.3cm, and there are 4 Chinese characters, 5 English letters, and 1 logo on which hot silver and embossing are required. Since the word is too small, if the bump is pressed after the silver is pressed, the stretching and deformation of the paper and some other factors may cause the hot silver and the embossing to be inaccurate. To this end, we have made the electric engraving yin and yang version, installed on the semi-automatic hot stamping die-cutting machine, and installed 5 sets at a time. Although the use of such a process solves the problem of inaccurate overprinting, there is a problem that the five sets of hot silver and the pressure of the embossing are inconsistent and cannot be adjusted. It is thought to be caused by the following reasons.
(1) The accuracy of the semi-automatic hot stamping die-cutting machine is not high, resulting in an imbalance of the overall pressure of the machine.
(2) The bonding of the copper plate on the hot plate is the use of double tube glue (an adhesive), and the unevenness of the double tube glue applied on the back side of the copper plate causes the pressure to be inconsistent.
(3) There are errors in the electro-engraving yin and yang plate making.
2. Process improvement
The above three reasons caused the pressure of the five sets of hot silver and embossing to be unconformable. If the stencil is placed on the movable table, the pressure can be adjusted to be about the same, but since the thickest part of the electric embossed embossed on the movable plate is only 0.68mm, the embossing will be flattened, although the scalding effect is still Yes, but there is no embossing effect.
Therefore, the elasticity of the blanket is used to solve this problem, and the specific steps are as follows.
(1) Remove the embossed and embossed embossed sheet attached to the movable table of the machine, take a small piece of offset printing with a 1.95mm thick air-cushion blanket, and glue it to the movable table with double-sided tape.
(2) Adjust the pressure of the machine to a moderate level. The original silver-plated copper intaglio plate adhered to the hot plate does not move. The pressure of the machine and the elasticity of the blanket can be used to press the paper into the copper intaglio.
Under the dual effects of suitable pressure and blanket elasticity, the products produced can meet the quality requirements of hot silver and achieve the effect of embossing.
In the production, due to the small font size, in order to prevent the paste, the hot silver temperature should be controlled between 90 and 100 ° C, and the pressure of the uneven pressure can be adjusted by padding different thickness paper.
The use of this process also has the following advantages.
(1) The use of the embossed and embossed yang plate is avoided, which avoids the problem of overprinting between the yin and yang plates, and avoids the loss caused by inaccurate overprinting during the production process.
(2) It is possible to greatly save the debugging time of the upper version and improve the production efficiency without installing the embossing and embossing positive plate and directly affixing the blanket.
(3) Save the plate making cost without pressing the embossed positive plate