How to ensure the hardness of corrugated board during the production of gift box
In the packaging industry, corrugated cardboard is often used in the design and use of corrugated cardboard. How to ensure the hardness of corrugated cardboard in the process of making gift packaging?
This problem is really troublesome and difficult to solve because the fiber used in the carton base paper is a hydrophilic substance that is inherently water-absorbent. In the wet weather such as the rainy season, when the relative humidity in the air is too high, the carton is in direct contact with the air, which will absorb the moisture in the air, resulting in the corrugated box produced, and the whole piece of cardboard is also soft. In the face of evasive complaint calls, and even returns, fines, compensation, etc., solving the softening of cardboard has become a top priority for carton factories.
Below, Xiaobian provides you with a solution to solve the problem of softening the carton.
1. Moisture resistance of carton board
The base paper and corrugated paper, especially the paper paper, have strong water absorption; the paper is exposed to humid air for a long time, the water price increases, and the lateral ring pressure strength of the paper decreases significantly. When the relative humidity is 85%, the ring pressure strength It will actually drop by 60%.
Solution: It is recommended to use a base paper with better waterproof and moisture-proof effect, especially the creped paper. To test the waterproof effect of the base paper, the surface water absorption of the base paper can be tested by Corbo. When the surface water absorption is below 50 g/m2 (60 S), the waterproof and moisture-proof effect is better. If you can't test the instrument, sprinkle a few drops of water directly on the cardboard or corrugated paper. Wait 60 seconds and then blot dry with paper to observe whether the paper surface has discoloration after penetration. If not, it proves that the waterproof and moisture-proof effect is better.
Generally, in order to improve the surface water repellency of the base paper, the paper mill needs to increase the proportion of the waterproof auxiliaries in the surface sizing starch paste in the papermaking process. Since the auxiliary is expensive, the base paper with good water repellency is lower than the cost per ton of the base paper with poor water repellency. To be higher than 50-100 yuan, the weight is higher and the higher the cost. Therefore, the carton factory needs to actively communicate with the carton customers and appropriately raise the quotation.
2, corrugated board production process
The main means to solve the problem of softening the carton is to choose the material, and then the production process. The reason for the softening of the carton is that it absorbs excess water. Therefore, the water in the carton should be removed as much as possible during the carton manufacturing process.
Solution: The original paper warehouse should be isolated from the outside as much as possible to avoid the damp air from wandering inside the warehouse. When appropriate, install a dehumidifier in the warehouse to ensure that the relative temperature is below 65%. When the base paper is in the warehouse, it will absorb the moisture in the moist air. When the machine is on the machine, the preheating wrap angle of the base paper on the drying cylinder should be increased. If the effect is still not good, the speed can be slowed down and the steam pressure can be increased. When the paste is made, the content of the powder is increased, and the amount of the glue is reduced, which can reduce the moisture of the carton. In addition, increasing the proportion of borax will also improve the feel of corrugated board.
Reduce the amount of cardboard piled up on the paper flyover and slow down the speed, especially after stacking the corrugated cardboard.
3, storage environment
The cardboard after the line should be taken out of the steam that has not been dispersed to avoid the condensation caused by the temperature difference. The environment of the storage cardboard or carton is kept ventilated and ventilated. The cardboard carton cannot be placed directly on the ground, and the plate (pray, splint) is used to take up . Pay attention to the gap between each other during storage to facilitate ventilation and heat dissipation.
Solution: It is recommended to use wooden pad to absorb the moisture on the ground, and the size is suitable for cardboard carton; keep the storage environment ventilated and ventilated, and use the wrapping film for external protection, which can effectively reduce and isolate the weather and affect the softening phenomenon. Many manufacturers are now using dehumidifiers. If the relative temperature of the warehouse is below 65%, the hardness of the board will be significantly improved.
4. Transportation environment
During the delivery of the product, some use vans for transportation, and some use vans. Usually the latter is more able to protect the drying of the cardboard board than the former, avoiding and reducing the softening. Solution: It is recommended to use van trucks, which is also the trucks commonly used by major suppliers.
5, carton processing technology
Corrugated cardboard should enter the next process as soon as possible after the cardboard line is taken offline. The longer the cycle, the softer the cardboard will absorb the moisture in the air.
In addition, when printing, especially multi-color printing or bulk solid printing, it is easy to cause the carton to be soft due to plate pressure.
Solution: Minimize the residence time of the carton during production and processing, and avoid exposure to humid air for too long and soft. The workshop should also be moderately isolated from the outside to prevent water vapor from blowing directly into the workshop. Try to ensure the hardness of the corrugated board before printing, and avoid excessive pressure on the printing. The die-cutting process tries to avoid the use of a circular die-cutting process which is very harmful to the flat pressure of the cardboard.
In short, the problem of the softening of the carton is still a matter of water. We can do it hard if we want to do everything we can to prevent the carton from absorbing water during raw paper storage, corrugated board processing, carton processing, storage and transportation.
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