Cutting process and common problems_slitting_Technology Focus_ENGLISH

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Name: Golden-Technology Printing Co., Ltd. Anhui Province
Golden-Technology Drug Packing Materials Co., Ltd. Anhui Province
Add: Longchi Road, Economic Development Zone, Tongcheng, Anhui Province
Tel:+86-0556-6567930
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Cutting process and common problems

Cutting process and its characteristics

In the processing of soft packaging, the cutting process is the size of the plastic film materials do not meet the requirements of the use of special processing methods of cutting equipment into qualified materials, such as special equipment called cutting machine.

Many soft packaging materials before being used for packing goods, often after cutting - printing (or coating) - composite - cutting repeatedly cut, but each time cutting process and different purposes, and cutting the common purpose:

(1) the cutting edge, cut on the procedures of reservation process for processing composite membrane material, and other materials;

(2) will be cut into narrow wide membrane volume size material, to obtain the required specifications of the coil.

(3 volumes), the roll diameter material into several small roll diameter material, the equivalent of rewinding. The correct split / double volume can make the finished product get a good appearance and roll up condition.

(4) by cutting / rewinding can correct the appearance of products staggered defects such as improving product grade.

(5) to the quality of the entire length of the film can be inspected again, remove the defective part. These sometimes mixed use, regardless of the kind of cutting process, cutting the material should meet the corresponding size requirements, such as cutting material, the width and length of the size and quality requirements such as flatness roll, technical index of appearance quality.

The importance of cutting process in packaging

With the improvement of packaging grade, the performance requirements of packaging materials are becoming more and more prominent, and there are many materials with special properties, such as barrier, light and so on. As with shading effect and surface quality requirements of high aluminum material, the elongation of CPP films greatly etc.. Because of the characteristics of these materials can not be damaged in the process, which is the equipment, especially the important process of soft plastic packaging - cutting process put forward very harsh requirements. On the other hand, with the gradual promotion of automated packaging equipment in the packaging industry, such as food packaging, cigarette packaging, automatic packaging machine on the quality of the cut after the material very picky, it points to the tangential high-grade, high precision control has brought a broad development space.

The film to solve and common fault

The process quality of the plastic film is affected by the quality of the film, and it is affected by the quality of the process itself. The cutting result is a comprehensive reflection of various quality factors, between the various relevant factors to influence each other, so that the quality problem to the more complicated. So, to control the cutting quality, on the one hand, as far as possible need to control stability of large shaft film roll, raw material quality; on the other hand, it needs cutting process in a timely manner to adjust according to the actual situation on the cutting quality is improved as far as possible. The performance of different kinds of plastic films in different cutting methods, there are some differences, such as: products used BOPET thickness is thin and has high strength, not easy to be tensile characteristics, with BOPP, CPP, CPE thin film cutting method is different. Here the common problems to easily arise only briefly and solve the film

Longitudinal stripe

The surface of the film roll forming a ring to the rib line. In cutting / rewinding process with a large amount of air and cumulative thickness tolerance is the main reason the poor longitudinal stripes, once the severe stripe is difficult to eliminate. One of the reasons is that the cutting speed is too fast. In general, most likely to occur in high speed vertical stripes and staggered quality problems.

The second is the operation precision of the equipment. For the equipment with higher precision, the running accuracy of some parts has been reduced after the continuous use of the equipment for a long time. For large scale cutting machine, because of the larger operating parts, it is more difficult to ensure the accuracy of the operation. Also because the plastic film is a polymer products, its thickness is very thin, the processing is more vulnerable to damage, so once the precision is not enough, easy to produce longitudinal stripes and other quality issues. To this end, in the replacement of equipment parts, accessories should be careful, should choose durable, high precision components, and the installation must also ensure that certain accuracy, otherwise it is difficult to meet the needs of the operation of the cutting machine.

Staggered floor

On the end of the film, there are some films out of the film, which is caused by the change of slide or film width in the process of coiling. First of all the same and Cuoceng slitting speed, acceleration and deceleration of the film too fast, smooth and good is easy to slip by staggered, should slow down the change. The film takes too tight will make the membrane lateral slip film, too loose will cause the air involved, will cause the film surface tension should be adjusted to take staggered.

Bottom wrinkle

The wrinkle occurs only in the length of the beginning of the film winding, which is a result of many factors, such as wrinkling and stripe, which is caused by many factors. As in the process parameters, different types of cutting machine, process parameters of the setting method, method, numerical value is different. For example: the old cutting machine by manually adjusting the motor winding voltage to control the winding tension and mechanical friction resistance by unwinding tension, while the new cutting machine using computer according to the parameters input of the control winding and unwinding motor are the most suitable winding and rewinding tension between the set parameters fundamentally different. Equipment performance and the intrinsic properties of the film have a great impact on the quality of the film, but the appropriate technology can improve the quality of the vertical stripes, the bottom of the wrinkle. Different equipment and different types of specifications of the film to use the appropriate cutting process, equipment conditions can also be adjusted by the process to make up, but the process must be carefully adjusted.

In addition, the cutting process of the most important raw material is paper core shaft and film roll, its quality not only affects the cutting speed, but also closely related with the vertical stripes, bottom wrinkle problem, need to adopt the method of process control, incoming inspection and final inspection combined to strengthen monitoring, stability of film roll shaft and the quality of raw materials and auxiliary materials. Such as paper core as an example, the paper core cutting machine using long wide (up to 2 meters above), but also high-speed rotation, as the center of the film winding, straightness and concentricity, strength and surface smoothness of the most important indicators. Generally speaking, the wider the core of the paper, the more difficult to guarantee the straightness and the degree of. Better quality of the paper core should be less than 0.04%, while the film should be 10 m below the surface roughness is less than 0.2 m of paper core. The quality of the core of the paper is not only related to manufacturing, but also with the storage, transportation and other conditions are closely related, if the use of the quality of the paper to find the core must be replaced in a timely manner.

Alice

Alice edge rolling edge of the film is thick film edge by winding the superposition edge tilt. The common reason is that the cutting knife is too blunt, when the cutting is generated at the cutting edge, the cutting edge of the film winding edge of the film can be turned out to be raised, and the cutter can be replaced in a timely manner to avoid the problem. Cutting tool installation is not correct, the coiling speed is too fast, too easy to produce when the reel is too tight.

Crack

The reinforcement is due to the thick accumulation of film thickness and the obvious protrusion formed on the surface of the film roll. This is mainly caused the quality of film itself, its film quality refers to the quality of finished products, by cutting shaped shaft film or by cutting again such as film thickness tolerances, film winding state, has an important influence on quality were cut after the film roll table, film quality poor even after cutting / rewinding can not get satisfactory surface quality. Just cut to improve local problems but do not change the whole problem, to get a good product appearance and winding quality, on the one hand to make proper adjustments in the cutting process, on the other hand must be required before the film-forming process to improve the quality of.

The length is insufficient, the width deviation is too big

This is due to the error of the counting error of the coil or the length of the cutting film, and the incorrect positioning of the device. To meet the needs of users to get a certain length of the film roll, under normal circumstances, the operator can receive the data from the reel to get the volume of the volume. But the production is often encountered in the film breaking off and the shaft part of film roll film surface and so on, if the label according to calculate the length and cutting, cutting until finally found that the length is not enough and can not be spliced, then vehicle products are to be authentic, especially the width of 1 meters above the cutting machine, more economic loss. To avoid this, should be based on the length and the membrane axis membrane model specification, the same process volumes is the relationship between the diameter, as long as the diameter data to be measured on the control winding length can roughly know the film roll roll length is in accordance with the requirements, if the difference is greater in the cutting attention when stitching length, avoid the phenomenon of insufficient length.

The film roll has a dust and even insects and other foreign bodies

Thin film in the process of cutting, need to be re opened and then re volume, which for the outside world to create the conditions of foreign bodies. And because many of the film products themselves need direct contact with food, medicine, etc., so the health requirements are very strict, clean production workshop to ensure product cleanliness is very important.