[China Glass Net] Molecular sieve is the main raw material for controlling the dew point of insulating glass. What kind of molecular sieve is used? How to carry out standard construction directly affects the dew point yield of its products.
There are two main types of hollow glass molecular sieves:
1. Particle size 0.4-0.8MM molecular sieve This product is special for filling machine, mainly because molecular sieve filling machine can only fill molecular sieve with particle size less than 0.9MM. If it is larger than 0.8MM, it will not be able to be filled normally. 0.4-0.8MM specification is also very normal when the construction is plugged. Therefore, for the filling machine itself, the finer the molecular sieve, the easier it is to fill.
2. Molecular sieve for manual filling: The specifications are 1-1.5, 1.5-2 can be manually filled with the same quality molecular sieve (refer to the same raw materials and processes, the same ability to absorb moisture, only the particle size is different) due to small The particle size molecular sieve has an average particle diameter of 0.5, and the expanded area per unit weight is 1.5 MM particle size, and the expansion area is 3 times. If a molecular sieve having a particle size of 1.5 MM is decomposed into 0.5 MM molecular sieve, it can be divided into 27 particles and decomposed into The 0.8MM molecular sieve can be divided into 6.7 capsules. If we lay the fine particle size and the 1.5-size molecular sieve on a newspaper and then put them in the same natural environment, we will find that the moisture absorption rate of the fine-grained molecular sieve is About 15 times of the person, that is to say, the operation time of the fine molecular sieve from the loading of the aluminum strip is only 1/15 of the operation time of the coarse particle size. We can do an experiment to prove this.
Take 200 grams (coarse and fine) molecular sieves into the two large pots, and then put them on the same ground. Each 10 minutes, (seven times a total of seven times) each weighed each additional weight, and recorded, below For the actual weight change, and according to the law of variation, the water absorption time and water absorption map:
From the law of moisture absorption of two kinds of molecular sieves in the above table, the conclusion is drawn:
1. The speed of moisture absorption of fine-grained molecular sieves is more active in the first 20 minutes, and at least 70% of the hygroscopic energy in 20 minutes has been released. The crude molecular sieves need to consume about 70% of energy for about 1.5 hours.
2. If the fine-grained molecular sieve and the coarse-grained molecular sieve are simultaneously poured into the aluminum frame, and the sealant is sealed after 20 minutes, then the fine molecular sieve has the water absorption capacity in the hollow glass, and the latter only needs the former one-third of the molecular sieve. The same moisture absorption effect can be achieved. Therefore, in the production of insulating glass, the selection of molecular sieve should be as large as possible, and the sealant should be sealed as much as possible after half an hour after filling.
2. There are two rows of venting holes on the aluminum strip used in the production of insulating glass. Its function is to facilitate the molecular sieve to absorb the moisture of the glass cavity. For many reasons, the size of these holes is inconsistent. On the same aluminum strip, we can It was found that many of the holes were not penetrated, and some of the holes were too large (the thickness of the blade for punching was 0.9 to 1 mm), and some of the fine molecular sieves could enter the hollow glass cavity through the large vent holes, thereby Affect the appearance quality of the insulating glass.
Third, the same quality molecular sieve on the market because the (0.4 ~ 0.8) specification is dedicated to the bending machine filling machine, the production process is relatively complex, so the price is higher than the coarse particle size molecular sieve.
The newly-developed new molecular sieve filling machine (has applied for national patent, inventor: Zhao Shiping) solves the common problems of all filling machines (including imported machines) on the market, fills the gap in the world of the industry, and designs a kind of energy. Effectively inject large-size molecular sieve into the aluminum strip cavity, and never block the discharge port, and enable the user to seal the aluminum frame of the molecular sieve in an orderly sealing sealant within half an hour, which is suitable for ordinary The filling of the aluminum frame and the bendable aluminum frame greatly improves the quality of the insulating glass.
If you used the 0.4~0.8 molecular sieve to produce hollow glass, you can use the new molecular sieve filling machine to fill the 1.5mm molecular sieve, which will never block, and can extend the operation time of the former fine molecular sieve several times.
If you use a fine-grained molecular sieve, seal the sealant within half an hour after filling, switch to a coarse molecular sieve, and seal the sealant in the same amount of time. Then, the coarse molecular sieve can only be used by one-third of the former. Achieve the same moisture absorption effect.
If you have been using manual filling of molecular sieves, there is no guarantee that the sealant will be sealed within 1.5 hours. The new filling machine can help you seal the sealant in an orderly manner within half an hour after filling, thus improving the quality of the insulating glass.
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