Cartons die cutting problems and solutions experts talk about the carton factory articles

The sound from the carton factory

People often ignore the impact of die-cutting quality on carton products, and think that die-cutting is only a small part of the carton production. With the emergence of various special requirements and specifications of carton products, the use of die-cutting machines is becoming more and more popular. As a result, die-cutting problems are also increasing. Die-cutting quality has become another key factor affecting the cost of the carton. Everyone neglects the die-cutting problem, causing an implicit loss, through the search for production. The root cause of die-cutting problems and the higher requirements imposed on equipment manufacturers, and taking the appropriate solutions to solve the problem. Now, please ask the carton factory and the supplier's representative to discuss the causes and solutions of the diecutting problem from both supply and demand.

With the advancement of society and the development of carton packaging technology, cartons have been gradually developed from single transport packaging to sales packaging and use of packaging. Now on the market beautiful appearance, different styles, beautifully designed gift boxes, display boxes, household goods, small appliances, telephones, mobile phones, food, health products and other crates, a wide variety, dazzling. With the improvement of the people’s living standards, packaging products will also be rapidly upgraded and replaced. Great changes have taken place in terms of use and function. Today's packaging products, especially some special-shaped, special-shaped carton boxes, can not meet the requirements of processing and manufacturing according to common production methods, and die-cutting technology is needed. Therefore, the emergence and development of die-cutting technology is to make great contributions to meet the changing needs of the market and users of packaging. At present, many cardboard boxes enterprises have some technical problems in the actual production of die-cut cartons, which cannot be well controlled and solved, thus failing to ensure product quality and being subject to customer complaints, affecting the company's sales market and economic efficiency. The author proposes personal opinions and suggestions from the causes and countermeasures of the main problems that exist, and discusses with your peers. The main factors affecting the quality of carton die-cutting are the following:

(I) Equipment factors

The performance and adjustable performance of the die-cutting equipment are prerequisites for ensuring the quality of the carton die-cutting. The performance is mainly the precision and pressure, the size and the control range of the speed, such as the parallelism of the round stencil roll and knife anvil roll, the processing precision, the range of the centrifugal runout, and the synchronization with the feed section, and the flattening die cutting machine. The processing precision of the main components, etc.; the controllability of work pressure and speed and the size of the adjustable range will all have an important impact on the quality and effect of die cutting. Therefore, when choosing the cutting equipment, the carton factory should comprehensively consider the performance, parameters and market requirements for the products of the equipment. Mold factor, the mold is commonly referred to as the knife template

The precision of mold making, the quality of cutters and indentation knives, the rationality of the glue lines, sponge pads and scrapping knifes, the pros and cons of the interface between the knives and the indenter blades, and even the quality of the wooden formwork will be Directly affect the overall quality of carton die-cutting. Such as: indentation and inaccurate incision, indentation line break or irregular, continuous incision or edge burr, incomplete or difficult to clear, etc., have a direct relationship with the mold. Carton factory should attach great importance to the quality requirements of mold making. For products with high requirements for special products or cartons, it is recommended to use better knife molds, such as laser knife molds.

(b) Board factor

The quality of the cardboard material, the flatness of the paperboard, the level of moisture in the paperboard, and the accuracy of the paperboard printing position will all result in the quality of the die-cut carton, such as: die-cut creasing, position inaccuracy, size inaccuracy, skewness And other serious consequences. A good die-cut carton should have higher requirements for the quality of the cardboard, especially the flatness of the paperboard.

(III) Operating Technology Factors

Workers' operating technology is the most important factor affecting the quality of carton die-cutting. Carton die-cutting is a technology that has high quality requirements for carton products. The technical level of operating workers is higher than that of general carton production. Therefore, the workers of the carton die-cutting process must undergo professional technical training, so that the operator can not only master the basic operating techniques such as upper edition, adjustment, adjustment, adjustment, and pressure adjustment, but also master the production process. The causes of quality problems and effective solutions can produce products that meet the standards or customer requirements to meet market needs.

The above lists several reasons for creating die-cutting problems and provides the following related solutions:

(D) indentation and incision is not accurate

As the cardboard is warped and uneven, the smoothness of the cardboard is ensured, the warping degree of the cardboard used for die-cutting shall not be greater than 3cm/m2, and if the warped cardboard may take 5 to 10 pieces, the overlap may be appropriate. Placed under pressure, to be leveled and then die-cut production; cutter or indentation knife with the wood template is not tight, under pressure conditions will occur skew, check die cutter, indentation knife is loose, available with wood template The thickness of a thin iron sheet with a uniform width is tight; the reduction ratio of the size of the circular stencil is not calculated correctly, and the reduction ratio of the stencil size of the circular stencil is adjusted. During the production, the adjustment and reduction ratio should be calculated according to the diameter of the stencil roller.

(five) Indentation line breaks

The paper board surface has insufficient burst strength, the fiber is too bad or the paperboard is too dry and brittle. Under the premise of considering the cost, replace the better paper and keep the paperboard at a certain moisture content, generally 8 to 14%; The die-cutting pressure is too large or the pressure is not balanced. A certain amount of elastic plastic strip is added parallel to both sides of the indentation knife to make it equal to the indentation knife, or it can be used to destroy the corrugation and eliminate the indentation fracture. More adaptable to the lower material of the cardboard; indentation knife thin or edge edge, adjust the cutting pressure, and make it equalized, eliminate indentation knife edge (use a grinding wheel or a file to round it) or replace the thick knife. If two thin knives are used in combination, there will be unexpected results; the cutting board is not clean and uneven, and the dirt on the cutting board is removed to maintain its flatness.

(6) Irregular trimming, burrs or corners are not cut off

The cutter is deformed so that the incision line is bent. Through the repair of the mold, the adjustment or replacement of the cutter is adjusted; the edge of the cutter blade is worn or notched or has been dulled; the die-cutting pressure is adjusted to make it balanced; if it is a cause of equipment wear, it should be repaired or Replace parts; die-cutting pressure adjustment is unbalanced, and the part cannot be cut off. Repair the anvil of the circular press die cutting machine or replace the anvil, keep it flat, and adjust the parallelity of the knife anvil roller and the stencil roll during production, and keep The pressure is balanced; the anvil plate steel plate is unbalanced, and the anvil rubber surface of the circular press die cutting machine has uneven cracks. Replace the anvil plate or the kraft tape on the cutting block at the incision to place 1-2 layers.

(7) Sizes of products after die cutting

Cardboard bending, according to the above method, eliminating the paper board bending factor, maintaining the flatness of the paperboard; paperboard water content is too high or uneven, after the formation of paperboard shrinkage phenomenon, especially the paper quality is more obvious, keep the paperboard moisture content in Between 8 and 14%, and maintain its watery uniformity.

(8) Inaccurate die cutting position

The gap between the paper feed roller or the feed roller of the round press or automatic flattening die cutting machine is improperly adjusted or the feeder and the feed roller are not parallel. Adjust the gap of the paper feed roller (wheel) to ensure proper clearance and not too much. Loosely, simultaneously check if the paper feeder and the paper feed roller are parallel and adjust; the position of the rubber pad fixed on the cutting board of the ordinary box machine (slot machine) is skewed or not firm; check whether the position of the cardboard fixing glue on the cutting board is in agreement with the knife mold Parallel and consistent, and adjustments; slot machine manual feeding is not in place, pay attention to the manual feeding in place, training workers operating technical essentials; printing run position, after die cutting position is not accurate, check whether the cardboard printing reference position is consistent with Whether the edge of the cardboard is parallel or not, adjust the printing position, especially the accuracy of the reference position. If the printed cardboard has been printed, select the classification and adjust the position of the die-cutting position to make up for the defects; the warpage of the cardboard is uneven, the cardboard size is not uniform or the edges are not parallel, and the paper-feeding position and the post-cut position are not generated. To ensure the consistency and parallelism of the cardboard flatness and cardboard size, if there is an irregular cardboard, it should be trimmed and trimmed with a partial pressure press before cutting.

(9) Difficulty in incomplete removal or manual scrapping

The distribution of waste cutters used in round blanking or automatic flattening die cutting is unreasonable; the distribution position of scrapping cutters is adjusted to be as scientific and reasonable as possible; the sponge pads or spring washers on the stripping die are worn and deformed. Loss of function, replacement of sponge pads or spring washers; poor cutter interface or cutting edge passivation incision is not cut off, check the connection at the interface is tight or high and low phenomenon and re-welding process, replace the blade has been passivated cutter; Die-cutting pressure is unbalanced, resulting in partial cuts and adjustment of die-cutting pressure balance.

The above is just a brief description of the causes and solutions provided by the author based on the die cutting problems encountered in actual production. There are still many problems that must be specifically analyzed according to the specific conditions in production so that corresponding measures can be taken to solve them.

(Text / Jiang Xianyi)