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The cardboard box is die-cut in three ways: flat pressing, round pressing and round pressing. The flattening has the highest accuracy, while the circle rounding has the highest efficiency. With the continuous application of high-grade die-cutting materials and technologies, more and more carton manufacturers have chosen circular press die cutting machines to produce carton boxes.
There are two methods of die-cutting and die-cutting. The bottom roller is the die-cut of steel roller. We usually call it hard die-cutting. The bottom roller sets are die-cut in soft material. Correspondingly, it is called soft die cutting. The biggest feature of soft die cutting is that the blade can be cut into the soft roller sleeve.
The problems that are easily caused by circular die cutting are:
· Change in size · Continuous cutting/drawing · Reciprocating knife · Difficult-to-discharge · Indentation is not in place. These problems are related to the choice of the type of die-cutting blade, the use of indentation lines, and the matching of related die-cutting materials. Inseparable relationship.
Swedish Sandvik and American National Corporation have products with corresponding technologies for round die cutting.
one. The selection of blades Despite the variety of materials that are die cut, a single dieboard needs to be composed of a variety of blades, but each user has the same requirements for die cutting: efficiency, quality, and cost.
The blade is selected according to the shape of the teeth, the number of teeth, the height, the thickness, and the hardness.
The round tooth was successfully used at the beginning of the tooth profile was 12 teeth per inch, was the earliest developed by the United States National Corporation. Since then, it has become the most basic tooth for round press die-cutting blades, and its use continues to be used by many users worldwide.
The 12-tooth is widely used in the die cutting of three-layer/five-layer corrugated cartons, especially in the circumferential direction.
Used with it is a transverse blade with 8 teeth per inch. Due to the large lateral cutting, the pressure needed to teach large, 8-tooth blade can reduce the cutting pressure, easy to cut through.
In order to reduce the depth of cutting into the bottom roller, in order to reduce the die-cutting pressure and increase the speed, a 10-tooth blade has been developed.
The 10-tooth blade can be used both at the circumference and in the cross direction to increase the effect of die cutting.
Many of the materials die-cut to the European market are made from base paper fibers, hard and difficult to cut. The launch of You Lidao has brought round die cutting to an unprecedented level.
The tooth shape of Uni-knife is smooth wave teeth, which greatly reduces the depth of cutting into the low roll, and brings a huge reduction in die-cutting pressure. The life of the bottom roll is prolonged, the shear becomes smooth, and the speed can be greatly improved.
KK knife English name Klean Kut.
Its special tooth design makes it ideal for both head and tail knives.
The thickness of a commonly used blade in circular die-cutting is 1.42mm. The 1.05mm blade is useful, but less.
1-3: The height of the round cylinder blade is determined by the height of the carton. Commonly used heights are: 23.80-24.10-24.38-24.60-25.10-25.40-26.0mm and so on.
Under normal circumstances, the height of the transverse blade is about 0.5 mm higher than that of the circumferential blade to ensure a bi-directional and uniform cutting.
The special tooth design of Unicus knife makes it possible to have the same height in the horizontal and circumferential directions, or slightly higher than the circumferential direction.
1-4: Hardness The material of the insert is usually medium hard and can meet most of the requirements for round die cutting; the harder insert can be used in the transverse or head and tail knife position to enhance the ability to resist the knife.
Unquenched cutting edges can be used for normal die cutting. Quenched edges are particularly suitable for extremely large batches of die cuts.
two. The indentation line indentation is similar to flat compression die cutting. Under normal circumstances, the lateral compression is slightly higher than the circumferential direction. When calculating the pressure line, the depth of the blade cut into the bottom roller must be taken into account. The blade is usually cut into the depth of the bottom roller 2-2.5mm (Ultra knife 1-1.5mm).
three. Sponge sponges play an important role in speed/discharge. In the circular die-cutting there are stripping sponges, bomb sponges, anti-dandruff sponges, and furrows (a kind of stripping). Due to the large variety of sponge specifications and the different marking methods, it is not possible to simply use the original sponge specifications as a standard. Professional circular die-cutting materials companies can provide the correct hardness and specifications of sponges.
four. Other good circular die cutting requires more than the above materials, and there are strict requirements on the quality and shape of the arc plate. More importantly, die-cutting operations and good commissioning pressure are critical for the life of the dieboard. Circular die cutting is affected by many factors. Correct analysis of various factors can help us find ways to increase efficiency and reduce costs.
Development and Application of Circular Press Die Cutting Technology
In the past, carton forming has mostly used chamfering notching machines. With the constant increase in packaging speed and accuracy, die-cutting molding has become the mainstream of carton production.