Corrugated carton die-cutting technology (I)

The prosperity of the commodity economy and the fierce market competition make corrugated cartons an important means for product manufacturers to market and promote their merchandise, gradually attracting the attention of packaging users and consumers. As an important link in the production process of corrugated cartons, the corrugated paper cartons are naturally shaped and processed. Become a problem that manufacturers pay attention to and solve.

Corrugated carton forming method

There are two types of corrugated box forming methods in China: die-cutting and slotting, among which die-cutting includes flat-press die-cutting, round-die-cut die cutting, and round-press die cutting.

Circular die cutting uses arc-shaped wood boards and roller knives for making. Because it is die-cutting the corrugated cardboard at the same time as the cutter die rolling, the strength of the die cutter is required to be relatively high (common thickness is 1.42mm, service life can be Up to 600,000 times.) Difficulty in manufacturing and costing die cutters. With the improvement of precision and the application of ancillary equipment, the die cutters have reached the level acceptable to most carton users. Its advantage lies in maintaining a certain precision at the same time, the speed is very fast, and the range of cardboard boxes that can be die-cut is very wide, which is suitable for large batches of live jobs, but its cost is high. At present, more and more manufacturers have adopted this method.

The flat die cutter uses flat die cutters, which are flat die cutters (thickness O.7 1 mm or 1.05 mm, with a service life of about 30 million cycles). The die cuts through the die at the same time. Corrugated cardboard, with the highest die-cut accuracy, is suitable for fine-cut cartons and small-to-medium-sized cartons, but at a lower cost, but the disadvantage is that it is slower (especially a hand-push flat-press die-cutting machine) and is affected by the web. Restricted, unable to die-cut large cartons, suitable for small orders.

Circular die-cutting die-cutting has been greatly improved on the basis of flat die-cutting die-cutting, with various features of flat die-cutting and die-cutting, flat die cutters are used, the production cost and difficulty are not too high, and the precision of die-cutting is high However, the speed is slow, and the investment in technology and cost is large, which is not conducive to large-scale production, so it is generally not commonly used.

Grooving is characterized by fast speed, no need to make knife molds, low cost, but poor precision, can only deal with less stringent precision and shape of the paper, this method in the carton factory is also very popular.

How to choose the forming method of corrugated carton

In terms of accuracy, several molding methods are ranked from high to low: flat die-cut die cutting, round die-cut die cutting, round die die cutting, slotting: in terms of speed, the order from high to low is: On Grooves, round die-cutting, round die-cutting, flat die-cutting. In selecting the corrugated box forming method, the most important though it seems that the knife is very small, it seems that it is not sharp enough, and its high precision, the significant feature of the round press die cutting is efficient; it should be clear which type of carton is mainly used for die cutting. True, the stable thickness of the blade support is the pressure rate. With the continuous application of high-grade die-cutting materials and technology, it has played a very good role in the transmission of large-scale processing and low precision requirements.

The use and popularity of commonly used low fronts, the scope of use of circular press die cutting machine is also a carton, slot machine should be selected, its lowest cost, speed angle of 52 degrees, which is a very stable application of a more extensive basis. Circular die cutting and hard die cutting are also faster; if the production volume is small, the precision requires a high angle. The smaller the edge angle is, the smaller the die-cut resistance is. Naturally and soft die-cutting are two methods. Hard die-cutting refers to that the bottom roller is a colored corrugated cardboard box, and the flattening and die-cutting should be selected to ensure that the blade edge is sharper and easier to cut through. . However, the edge angle is more steel die-cutting, whereas the bottom roller is made of soft material to verify the customer's requirements for high precision; if the batch is large and fine, the sharp-edged and edge-corrected chip-drawing process is soft die-cutting. The most important feature of soft die cutting is that the blades are not very demanding products, and the harder it is to choose a round press. The 42-degree blade manufacturing process of the sharpened edge was cut into a soft roll cover.

Die-cutting can not only improve production efficiency, but also, for simplicity, there are already many companies that can produce it, but its choice of round-bore circular die-cutting blades can reduce production costs. The blade performance is inferior to that produced by broaching. The key factor in choosing a round die-cutting blade is the increase in the application of tooth type and die-cutting technology. The selection of corresponding cutting lines, indentation lines and sponges for different materials has become a plate material. The key to successful die-cutting. Die cutters should meet the following performance requirements: Uniformity of steel material, proper combination of blade body and blade hardness, accurate specifications, and blade quenched. High-quality die cutters usually have a blade hardness that is significantly higher than the hardness of the blade body, which not only facilitates molding but also provides a long die life.

Die cutter type, thickness, height die cutter can be divided into flat die cutters, round die cutters (such as sharp knife, soft knife), and special effects cutters (such as point knife, ripple Knife, etc.) n commonly used die cutter, indentation line thickness specifications in Table 1. The laser die-cut version has a precision kerf which cannot be achieved by hand saws. This strict kerf requires that the thickness of the die cutter must be strictly controlled within a certain tolerance. Uneven thickness and out of tolerance can lead to difficult inserts and increase The deformation of the plate or the looseness of the knife line will definitely affect the die cut size.

Table 1 The thickness of common die cutters and indentation lines The professional die cutter manufacturer can provide die cutters of various heights. The most commonly used die cutter blades have a height of 1.80 mm. According to the characteristics of the die-cutting machine and the material to be die-cut and the requirements of the die-cutting effect, the heights of other commonly used blades are 22.60mm, 30mm, 40mm, 50mm, and so on.

The blade type of the die-cutting blade is generally divided into four types: a low front, a unilateral low front, a high front, and a unilateral high front according to the shape of the cutting edge.

The low-edge knife is one of the most widely used die cutters.

The high front knife is designed for die cutting thick materials. Its long blade can greatly reduce the die cutting resistance. Naturally, it can also reduce the die cutting pressure. At the same time, it can provide a good trimming for thick materials.

One-sided knives are used for die cutting of closed materials or where straight edges are required.
The unilateral high front knife is used for die cutting thick materials.

In order to achieve a variety of complex graphics die cutting or produce special effects, you need to use special die-cutting blades, such as dotted lines. There are many combinations of dotted lines. The common expression method is how many teeth per inch, such as 2 teeth and 6 teeth, but this method is sometimes not specific enough, such as 6 teeth per inch, there are 1,3mm and 2,2mm Gear sample. It is customary to use square-toothed knives that have a small number of teeth, and those that have relatively dense teeth are called knives. Blades for special effects include square-edged knives, corrugated knives, rubberized knives, hand-knife knives, and zipper knives.