The circular die-cutting die is a high-efficiency and high-precision tool that replaces the flat-pressed die-cutting die cutter. It was first used in the field of post-press printing. At present, in addition to the application in the field of post-press printing, circular die-cutting cutters are widely used in the processing fields of paper boxes, paper cups, stickers, and electronic labels.
Processing considerations
The circular die-cutting die is a very special tool that is processed by a similar engraving method on a round shaft. The machining process is complicated, so pay attention to the following items.
(1) For circular die-cutting cutters for die-cutting cigarette packets, the machining accuracy should be within ±0.07 mm of the product die-cutting error; for magnetic round-press die-cutting cutters, it is usually used Several die-cutting knives simultaneously die-cut different parts of the product on one line at the same time, so the machining accuracy should be within ±0.03mm of the product die-cutting error.
(2) After the circular die-cutting cutter is formed, the width of the cutting edge is 0.02-0.05mm and the height is 1.0-1.5mm. In order to strengthen the control of the deformation during processing, it is basically required to adopt super-hard processing. It puts high requirements on the comprehensive processing capability of technicians, such as the technician's knowledge of the characteristics of the circular die cutter and the processing equipment, as well as the control of the hardness, toughness and material deformation of the tool during the post-heat treatment. Wait. The improvement of this comprehensive processing capability is the main factor determining the final forming quality of the round die cutter.
(3) Since the die-cutting pattern of the cigarette pack is constantly changing, each round-pressing die cutter is a brand-new product, which is the design ability and process adaptability of the circular die-cutting cutter manufacturing company. And the quality of the personnel themselves put forward high requirements.
Precautions for use
The wide use of round die cutters not only improves the production efficiency of the products, but also brings considerable economic benefits to the printing enterprises. However, its special performance still causes some problems in its use, which requires the operator to pay attention to it. .
1. Paper selection
As more and more businesses are increasingly demanding high-end product packaging, packaging must meet certain functions while protecting the function of the product. Therefore, the types of packaging paper are becoming more and more complicated. In summary, white cardboard is used. , coated gold (silver) cardboard, aluminized film (transfer) paper, in these papers, can be divided into two major categories of recycled paper and virgin paper.
2. Selection of sponge strips
The choice of sponge strips is equally important when performing round die cutting. Choosing a good sponge strip and the correct placement can effectively suppress and transport the paper, and can effectively prevent the recycled paper from fluffing and dusting. When installing the sponge strip, care should be taken to maintain a distance of 0.5 to 1.0 mm from the round die cutter blade. common
The sponge strip has a width of 20 to 25 mm and a thickness of 2.0 to 3.5 mm, each of which has a length of 1 m and a Shore hardness of 25 to 50 HS, and is required to have a hand without deformation, and the bending automatically rebounds back to the original shape.
3. Other considerations
In addition to the choice of paper and sponge strips, the phenomenon of indentation blasting should be avoided during round die cutting, and the main causes of this phenomenon are: 1 when using the circular die, the die cutting pressure Too large; 2 in the die-cut hard-box cigarette case, the distance between the indentation lines is small, and the die-cutting pressure is too large; 3 round-pressed die cutter blade is not sharp or the paper is too thick, causing a knife or a sticking knife malfunction.
Storage precautions
The round die cutter should be cleaned before storage, and the machine yellow oil should be mixed to isolate it from the air. Then choose a cool and dry place, cover the dust with a bubble plastic film, preferably placed on the wood. Inside the box.
　　 The above content is selected from the 11th issue of 2012, Printing and Printing , Packaging and Decoration, and more journal content, please pay attention to the journal channel.
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