Die-cutting requirements for blade performance (1)

With the increasing demand for packaging of goods, printing and packaging companies are all working hard to improve their die cutting technology and equipment. This article lists many requirements for the blade during the die-cutting process and the die-cutting process. It is hoped that the printing and packaging business will help determine and solve the problem of poor die-cutting.
First, the requirements of the blade in the production of die-cutting plate 1. The easy-to-bend forming blade is easy to bend. On the one hand, it can meet the requirements of modern society for high-grade packaging of various shapes. On the other hand, it can shorten the time of making plates for die-cutting and improve the time. Work efficiency.
The main factors influencing the bending performance of die cutters are:
(1) Material Hardness The type of blade is determined based on the material hardness and extremes of the blade. The harder the material is, the harder it is to bend. For example, VERTEX is harder to bend than QINFLEX.
(2) Decarburization The decarburized material is easier to bend than without decarburization. Such as: 0.71mm QINFLEX can be bent to 150 degrees acute angle (R = 0.3mm), and the indentation line is bent easily. The blade of the peak blade has cracked earlier than the blade due to the removal of the surface decarburization layer over a large area.
(3) The composition and structure of the material The excellent material will not be easily broken when it is bent. The material produced by different companies will see a clear difference when it is bent.
(4) Mold design of the bender An excellent mold can avoid incorrect pressure on blade deformation.
(5) Blade Thickness and Height The thicker the blade, the more difficult it is to bend; the higher the blade, the greater the force required for bending. For products with extremely precise and complex shapes, the 0.53mm thin knife self-ash can bring a lot of convenience.
(6) The plastic blade of the blade should have a certain degree of bending plasticity, plasticity is too large, the blade will be like a spring, if too small, it will be like a plasticine, will be deformed by a little pressure.
Good plasticity should be a slight rebound after the blade is bent into a certain shape.
2, easy to install version Insert the blade into the slotted template, it should be tight and moderate, gently use the plate hammer to insert the blade, the following factors will lead to plate loading difficulties:
(1) Thickness of the blade The thickness of the blade is usually controlled within a certain range of tolerance. Exceeding the tolerance range will result in over-tightening or loosening.
(2) The width and width of the wide and narrow kerfs of the kerf (slot) must be strictly controlled within the tolerance range, and it must be sufficiently straight. If there is a small distance curve, it will be difficult to load the knife.
(3) Chamfering of the blade back The chamfered blade is not trapped by the protruding corners when it is placed into the template.
A new concept of the TB blade has been introduced, and the blade can be easily loaded into the stencil by means of a beveled back.
3, good joints at the blade joints / foot treatment can avoid continuous cutting or gargle at the outlet.
(1) The die of the butt-cutting butt cutter shall have a precise verticality so that each cut end obtained is perpendicular to the cutting edge.
(2 foot treatment because the blade has a different edge type, such as the center of 52 degrees, 42 degrees, peak, side peaks, etc., so the corner cutting machine mold must be strictly matched with the cutting blade, the mold gap will affect the cut The beginning and side of the side.
(3 blade mouth in the blade of the blade, if the material is not ideal, or after the blade after quenching is not good, there will be gargle phenomenon.
Second, the die-cutting process requirements for die-cutting blades 1. Uniformly cut-off users hope that the die-cut version can evenly cut the die-cut material after installation. What causes the die-cut version to not evenly cut the die-cut material?
(1) Uneven blade height blades have a high degree of tolerance during production. The size of the tolerances and whether they are controlled in tolerances will affect the uniformity of the blade height, resulting in high point cuts. If pressure is applied in this situation, it will lead to a high point of blade damage, no longer sharp, and the life of the high point position will be greatly reduced. Especially for large area die-cuts, this defect is particularly evident.
(2) Straightness tolerance of the insert is too large. If the straightness tolerance of the insert is too large, the actual straightness is beyond the tolerance. When the forward cutting of the cutting edge is cut off, other parts cannot be cut at the same time. Pressurization will cause a high point. The part becomes blunt. This phenomenon is especially noticeable when used in large sections of blades.
(3) Different sharpness at different positions of the blade Although the height and straightness of the blade meet the requirements, if the blade is not sharp enough at a certain position, it will cause the department to cut the die-cut material.
(4) The corner shrinkage metal material is compressed or stretched under force, and the blade is no exception. When the blade is bent, the inside is squeezed and there is no place to extend, resulting in a large amount of lateral pull, and thus at the corner The shrinkage in the width direction of the blade is generated, so that the blade at the site is shorter than the two.
The problem can be solved by grinding the inner side of the bent part of the blade a little less than half the thickness of the blade.
Compared with the low-peak knife, the peak knife has a smaller shrinkage. (To be continued)