Friends who are engaged in the carton industry have been chased by the customer purchasing lady for a period of time every year and asked the same sentence: Why is it so soft!
This problem is really troublesome and difficult to solve, because the fiber used in the carton base paper is a hydrophilic substance, which is naturally highly absorbent. During the rainy season and other humid weather, when the relative humidity in the air is too high, the carton will directly contact the air and will absorb the moisture in the air, resulting in the corrugated carton produced, the entire cardboard is also soft. In the face of evasive complaints, and even returns, fines, compensation, etc., resolving the cardboard back has become the top priority of the carton factory.
Below, the editor provides you with a package solution for resolving the soft return of the carton.
1. Moisture resistance of paper and cardboard
Base paper and corrugated paper, especially tile paper, have strong water absorption; when the paper is exposed to humid air for a long time, the water price increases, and the transverse compressive strength of the paper will obviously decrease. When the relative humidity is 85%, the compressive strength It will drop by 60%.
Solution
It is recommended to use base paper with better waterproof and moisture-proof effect, especially pitted tile paper. To check the waterproof effect of the base paper, the surface water absorption of the base paper can be tested by Corbett. Generally, when the surface water absorption is below 50 g / m2 (60S), the waterproof and moisture proof effect is better. If you cannot test the instrument, sprinkle a few drops of water directly on the cardboard or corrugated paper, wait for 60 seconds to dry with paper, and observe whether the paper surface has discolored after penetration. If not, it proves that the waterproof and moisture proof effect is good.
Generally, in order to improve the surface water resistance of the base paper, the paper mill needs to increase the proportion of the waterproof auxiliary agent in the surface sizing starch paste. Because the auxiliary agent is expensive, the base paper with good water resistance is more expensive than the base paper with poor water resistance. To be higher than 50-100 yuan, the lower the weight, the higher the cost. Therefore, the carton factory needs to take the initiative to communicate with carton customers to properly raise the quotation.
2. Production process of corrugated board
The main way to solve the problem of cartons returning to softness is to choose a good material, followed by the production process. The reason for the softness of the carton is that it absorbs excessive moisture. Therefore, in the process of carton production and processing, the moisture in the carton should be removed as much as possible.
Solution
The base paper warehouse should be isolated from the outside as much as possible, and absolutely avoid humid air wandering inside the warehouse. When appropriate, install a dehumidifier in the warehouse to ensure that the relative temperature is below 65%.
The base paper will absorb the moisture in the moist air when it is in the warehouse. The preheating angle of the base paper on the dryer should be increased when the machine is on the machine. If the effect is still not good, you can slow down the speed and increase the steam pressure.
When making paste, increase the powder content and reduce the amount of glue, which can reduce the moisture of the carton. In addition, increasing the proportion of borax will also improve the feel of corrugated cardboard.
Reduce the amount of cardboard stacked on the paper flyover, slow down the speed, especially after the corrugated cardboard is stacked, fully dehumidify.
3. Storage environment
Cardboard after off-line should be evacuated from the steam that has not been scattered, to avoid condensation caused by temperature differences. The environment in which the cardboard or carton is stored should be ventilated and ventilated. The cardboard carton should not be placed directly on the ground, and should be supported by pads (pallets, plywood) . Pay attention to the gap between each other during storage to facilitate ventilation and heat dissipation.
Solution
It is recommended to use wooden pads, which can absorb some of the moisture on the ground, and the size is suitable for cardboard boxes; keep the storage environment ventilated and ventilated, and use the wrapping film for external protection, which can effectively reduce and isolate the effect of weather from softening.
Many manufacturers now use dehumidifiers. If the relative temperature of the warehouse is below 65%, the hardness of the cardboard will be significantly improved.
4. Transportation environment
In the process of product delivery, some use open trucks to transport, and some use vans. Usually the latter is better than the former to protect the drying of the cardboard, avoid and reduce the softening.
Solution
It is recommended to use van trucks for transportation, which are currently commonly used by major supplier companies.
5. Carton processing technology
Corrugated paperboard should enter the next process as soon as possible after it goes off the production line. The longer the cycle, the better the cardboard will absorb moisture in the air and soften.
In addition, when printing, especially multi-color printing or bulk solid printing, because of the pressure of the printing plate, it is easy to cause the carton to be soft.
Solution
Try to shorten the residence time of the carton during the production and processing process to avoid being exposed to humid air for too long and softening. The workshop should also be properly isolated from the outside to prevent water vapor from blowing directly into the workshop.
Try to ensure the hardness of corrugated cardboard before printing, and avoid excessive pressure during printing. The die-cutting process avoids the use of the round die-cutting process that causes great damage to the cardboard.
In short, the problem of cartons returning to softness is ultimately a matter of moisture. Only by doing everything possible to prevent the carton from absorbing moisture during raw paper storage, corrugated board processing, carton processing, storage and transportation, we can harden it.
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