Moistureproof is to avoid the humidity in the air is too large, the humidity of the air is too general assembly makes mould multiply quickly, mould can make article mouldy change not only.
Many people don't know that mold is caused by too much humidity in the air.Scientific research indicates that when the temperature of the home environment is between 25℃ and 30℃, and the relative humidity is more than 60%RH, the oxygen in the air is very enough, then the mold will be abnormally active, and will rapidly multiply.As a result, the annual plum rain season, the mold brought by the annoyance will widely corrode everyone's day.
Mold varieties are abnormally complicated, including ascomycetes, alginaceous fungi, incomplete fungi, etc.Mold to convey the primary rely on spores, spores are fine powder, the naked eye is not easy to observe.Because of its small size and light weight, it can float around with the movement of air currents, dust, people and objects.In the process of activities, once encountered a suitable environment for development, they will immediately grow and multiply.Mold, odor, and distortion of the object thus occurred.
Heavy duty box for moisture-proof manufacturing, in addition to the maintenance of the packaging is not soaked by water, the first is to avoid water on the box itself.Because the carton wetted by water after the box compressive strength, break resistance will be greatly reduced, so will seriously affect the quality of packaging.Corrugated carton for moisture-proof manufacturing, usually the use of coated waterproof agent to solve the problem.Therefore, according to the effect of waterproof agent can be divided into moisture-proof carton manufacturing methods: temporary waterproof treatment and durable waterproof treatment.
Temporary water repellent
Corrugated board in the production process after the selection of temporary waterproof agent treatment, with temporary waterproof function.According to JISZ1537 explanation: when the water falls on it for a short time, do not get wet into water droplets, can avoid water penetration cardboard.The technology of temporary waterproofing agent treating paperboard has been used in every big carton factory in China in recent ten years.Originally introduced from Japan, this water-repellent literally means "water extractor" in Japanese.
When in contact with water, the water on this cardboard is not moist, the formation of water droplets roll off, so as to reach the waterproof effect.However, the adhesion of wax to paper fiber is not good, especially when the extraction agent is diluted 30 times in the future, its solid content as long as 1.5+, paper fiber as long as a very thin layer of wax wrapped.Because other wax emulsion wax in particle size are usually more than the usual polymer emulsion particle size is large, deep into the paper fiber permeability is difficult, to pull together agent for alum chemical sensitivity, usually under the paper appearance usually soon demulsification and sedimentary meters, for the most part of the wax particles in drawing water only in a very thin layer exist on paper.
Under the effect of external conflict force, the wax is simply removed by the conflict, exposing the waxless wrapped fiber, the waterproof effect is greatly reduced.In order to enhance the adhesion of wax to paper fiber, there are usually rosin derivatives or carboxylated polymer emulsions in the extractant, which have good adhesion to paper fiber and good solubility with wax.
So, their participation can promote the adhesion of wax on the paper fiber, together if the wax is modified, such as its oxidation, base, also have similar effect, can make the wax on the paper fiber adhesion to add.But it must be pointed out that it is added to these methods, drawing agent in such a concentration of the composition is still not a waterproof film layer, so in the encounter of conflict, such as carton in the process of transfer, stacking conflict, usually make this waterproof appearance lost.This is why the coating of this kind of carton as temporary waterproof carton.Now, drawing agent has been widely used in some carton factories, and become a fundamental process.