Solve the five ways of softening the carton of wet weather?jiu0 edited on2017-06-12 09:07:51 153 views
Solve the five ways of softening the carton of wet weather?
Engaged in the carton industry friends, each year has been a period of time, the customer purchasing miss her buttocks asked the same sentence: why so soft!
This problem is really troublesome and difficult to solve, because the fiber used in the paper is a hydrophilic substance, naturally absorbent.
When the relative humidity in the air is too high during the rainy season, when the relative humidity is too high, the carton is in direct contact with the air. it absorbs water in the air and leads to the corrugated cardboard box produced. the whole paper is soft.
In the face of the evasive complaints, even returns, fines, compensation and so on, the solution of cardboard softening became the top priority of the carton factory.
The following is the packing zone to solve the softening of the carton solution.
I moisture - proof of paper and board
Base paper and corrugated paper, especially the water absorption of corrugated paper.
The exposure time of paper in the humid air is long, the water price increases, and the transverse ring pressure strength of paper decreases obviously.
When the relative humidity is 85 %, the strength of ring pressure drops by 60 %.
How to solve the moistureproof problem of cardboard
It is recommended to use waterproof and moisture - proof effect better base paper, especially the tile paper of the pit.
Test the waterproof effect of the base paper, the surface water absorption of the base paper can be tested by family wrangle, the general surface water absorption is less than 50 grams / square meter ( 60s ), waterproof and moisture proof is better.
If you can't test the instrument, pour a few drops of water directly on the box board or corrugated cardboard, wait 60 seconds after the paper to dry, observe whether the paper surface has osmotic color, if not, proof that waterproof and moisture-proof effect is better.
In order to improve the surface waterproof of base paper, the proportion of waterproof additives in surface sizing starch paste is increased in papermaking process.
Because the auxiliary price is expensive, the waterproof quality base paper is 50 - 100 yuan higher than the waterproof quality base paper, and the lower the weight is, the higher the cost.
Therefore, the carton factory needs to actively communicate with the carton customer, to improve the quotation appropriately.
The production process of corrugated cardboard
The main method to solve the softening of the carton is to select the material, followed by the production process.
The factor of softening the carton is the absorption of excess moisture.
Therefore, in the carton production process, should try to remove the water in the carton.
How to remove the solution of carton water:
The base paper warehouse is insulated as much as possible from the outside, absolutely to avoid the wet air wandering in the warehouse.
When appropriate, add a dehumidifier in the warehouse to ensure that the relative temperature is below 65 %.
The base paper will absorb moisture in the wet air at the time of the warehouse, and increase the preheating angle of the base paper on the dryer.
If the effect is still not good, the speed can be slowed and steam pressure is increased.
When making paste, increase the content of powder, reduce the amount of glue, can reduce the water of the carton.
In addition, increase the proportion of borax will also improve the feel of corrugated cardboard.
Reduce the paper board stack of the pile, slow down the speed, corrugated board, after full dehumidification.
Iii. storage environment:
After the board of the board, should continue to smoke containing the vapor, to avoid the temperature difference to form condensate phenomenon.
Store the indoor environment of cardboard cartons, and should ventilate and ventilate in time when the weather is not humid.
Cardboard cartons can not be placed directly on the ground.
The backing plate ( pallet, plywood ) shall be used.
Attention to the clearance between each other in storage to facilitate ventilation and heat dissipation.
A solution to how to prevent moisture from cardboard:
It is recommended to use wood backing plate to absorb some moisture on the ground. The size of the wood backing plate is suitable for the cardboard cartons.
Maintaining ventilation and ventilation, using chan film for external protection, can effectively reduce softening phenomenon.
Now many manufacturers use dehumidifier, if can ensure the relative temperature of the warehouse below 65 %, cardboard hardness will obviously improve.
Iv. how to prevent moisture from moisture transport:
In the delivery of products, some use open wagon transport, some use van.
Usually the latter is more able to protect the drying of the cardboard than the former, avoid and reduce softening.
How to transport cartons to moisture - proof solutions:
The proposed use of van truck transport, this is also the current large supply companies commonly used goods vehicles.
5. carton processing technology:
Corrugated board from the board line of the line, should enter the next process as soon as possible.
The longer the cycle, the easier the cardboard to absorb water in the air and soft.
In addition, in the printing, especially for multi-color printing, or large block printing on the spot, because of the printing pressure, easy to cause the cartons to be compressed soft.
Try to shorten the stay time of the carton in the process of production, avoid exposure to the wet air for too long and back soft.
The workshop should also be moderately isolated from the outside to avoid water vapor directly into the workshop.
Before printing, try to ensure the hardness of corrugated board, printing to avoid excessive pressure.
Die - cutting process to avoid the use of the cardboard flat pressure damage to a large circular rotary cutting process.
In short, the problem of softening of the carton is to be attributed to the bottom or water problem.
Only want to do all the way in the base paper storage, corrugated board processing, cartons processing, storage and transport process, avoid cartons to absorb moisture, cardboard cardboard can hard up.
published on：20170612 09:07:51 guangzhou
category： Home Moisture