The main points of design and production control of special-shaped bags
The special-shaped bag has excellent shelf appeal due to its changeable shape, and is a popular packaging form in the foreign market. With the improvement of people's quality of life, special-shaped bags have gradually become one of the means for China's commodity production enterprises to increase brand awareness and increase product selling points. Pay attention to the following issues in the design of special-shaped bags:
1. Changes in content
After the ordinary composite packaging bag is changed into a special-shaped bag, its capacity will definitely change to some extent. Therefore, the size of the packaging bag needs to be redesigned.
2. Changes in the shape and edge of the packaging bag
Because it is a flexible packaging bag, the outer edge of the packaging bag should not use sharp corners to avoid piercing other packaging during stacking or injuring the user.
3. The impact of packaging
If the special-shaped bag is sealed with an automatic sealing device, in order to facilitate the smooth production, there are certain requirements on the opening direction and sealing position of the special-shaped bag, which is also a point to be considered.
4. The biggest problem of the design draft of the special-shaped bag is that there is no bleeding position. The special-shaped bag produced is prone to the problem of "the content is lost when cutting more, and the white border appears when cutting less", which seriously affects the appearance of the product. The bleeding position of the special-shaped bag is generally 3mm or more, so in order to facilitate production, the design draft should redesign the bleeding position.
After comprehensively considering the above factors, combined with exquisite pattern design, a successful special-shaped flexible packaging bag was born.
According to different forms, special-shaped bags can be divided into the following types.
1. Add mouth shaped self-supporting bag
The function of the mouth is to facilitate the dumping of the content, and the product after the mouth can be resealed, which means that it can be used for many times. This special-shaped bag is suitable for liquids such as liquid drinks, shower gel, shampoo, ketchup, edible oil, or other liquid products that need to be opened many times.
2. Shaped stand-up pouch with zipper
The purpose of the zipper is also to facilitate multiple unsealing. But the difference is that the way of repeated sealing is a zipper, so this type of design is not suitable for encapsulating liquid, but for some lightweight dry items, such as: candy, dried fruit, chocolate, cookies, jelly, tea, etc.
3. Imitated mouth shaped self-supporting bag
The characteristic of this packaging bag is that there is no additional mouth in the packaging design, but the use of special-shaped bags to produce a bag-like shape similar to the mouth, easy to access. This design is suitable for liquid refills, because once it is opened, it can no longer be sealed, and the applicable products are basically the same as those applicable to the special-shaped stand-up pouches.
In the production of special-shaped bags, there are mainly the following points to be noted:
1. Typesetting
1. Control of waste margin
Depending on the material of the film and the type of the bag, the waste margin of the shaped bag should generally be 5 MM or more. Therefore, the direction of bag making is to facilitate mass production.
2. Choice of bag-out direction
There are two types of bag-out directions: horizontal and vertical . The selection of the bag-out direction during the production of special-shaped bags should comprehensively consider the characteristics of the special-shaped bags, as well as their forming methods, subsequent processing equipment requirements, product quality requirements and other factors. And should meet the production requirements, try to reduce the amount of waste edge film. If the direction of the bag is not selected properly, it will greatly affect the production efficiency and even lead to no production at all.
3. Control of the number of production columns
According to the experience obtained in the actual production of the author, as the size of the bag type not selectively produce a plurality of columns, so that the subsequent die-cutting is more conducive to winding the waste edge, in general, the number of columns may be selected from 2 to 3 Column.
Second, die cutting
The automatic die-cutting process stage of special-shaped bags is a key stage in the processing process of special-shaped bags. In order to ensure that the die-cutting material can be cut evenly, in addition to selecting the appropriate die-cutting blade, several aspects such as die-cutting pressure, die-cutting plate parallelism and die-cutting blade height consistency should be effectively controlled.
1. Selection and treatment of die cutter
1) Select the appropriate die cutter
Because the die-cutting knife is essential to the die-cutting process, the appropriate die-cutting knife should be selected according to the actual needs. The influence of the die cutter on the die cutting process is mainly caused by the sharpness and hardness of the die cutter blade.
The die cutter with appropriate hardness can not only bring good stability, but also its good rigidity is easy to transmit the die cutting pressure from the back of the knife to the blade instantly to complete the die cutting process. In addition, the 420 blade is sharper than the 520 blade. At the same time, due to the reduction of die cutting pressure and wear, the life of the blade is greatly extended. Therefore, it is necessary to select a suitable blade material according to the die-cut material. At the same time, we should also try to choose blades with uniform sharpness in different positions.
2) Solve the problem of die corner shrinkage
In the process of die-cutting of special-shaped bags, the cutting effect is not good due to the shrinkage of the blade corners. According to experience, the thickness on the inside is slightly less than half of the thickness of the blade.
2. Related control in the process
1) Control of die cutting pressure
Die pressing down during the cutting, which generates pressure should be controlled within 500 N. If the pressure is too large, it will easily cause the edge of the knife edge; if it is too small, it will easily cause the incomplete die cutting of the bag.
2) Control of the distance between die-cutting blades
During the installation and commissioning, due to various reasons, the blade may be damaged at the beginning, and the result can be imagined. Therefore, the distance between the die-cutting blades should be controlled during the die-cutting process.
3) Control of the parallelism of the die-cutting board
During the die cutting process, make sure that the upper and lower plates of the special-shaped bag die cutting machine are parallel. If the upper and lower plates of the die cutting machine are not parallel, it will cause uneven pressure at different positions of the die cutting plate, so the die cut cannot be cut evenly. material. At the same time, it is also easy to cause uneven force on the pull rod of the die cutting machine, causing the pull rod to break.
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