Tupley unveils the mystery of the moldy wallpaper

2022-07-22
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After visiting customers in South China, East China and other regions, tepli wallpaper found that there was a problem of moldy wallpaper. Let's let Li Jigong, the marketing director of tepli, answer the question

recently, an old customer of our company in the southwest talked about the problem of moldy wallpaper. Moldy wallpaper has caused hundreds of thousands of losses to his company, and has seriously affected the market sales of wallpaper in this region. In addition, customers in South China, East China and other regions also encountered the same problems through visits

tupley Wallpaper - director of marketing center Li Jigong

a common condition in these areas is that this area will have continuous high temperature and high humidity for a period of time, and the weather is stuffy, poor air circulation and other climatic characteristics

interview record: phase 1

dealer customer:

our company had a project last year, which had a large area of wallpaper mildew. Now the engineering party believes that there is a problem with the wallpaper we supply, and proposes compensation, with a total price of hundreds of thousands of yuan. The mildew problem this time is unusual and strange. We have done the relevant mold prevention work very closely, but in the end, there was a large area of wallpaper mildew problem

director Li Jigong:

first of all, we need to find out how mold and moldy are the same, and then analyze how moldy problems occur in your case

first: mold is a kind of fungus, which grows in soil and many common materials (above). They spread by producing spores (such as seeds). Spores split from the mother, then germinate and grow

because spores (equivalent to plant seeds) are very small (1-10 μ m) It is easy to be carried by the flowing air, and they may adhere to the dust and drift to any place with the wind

second: germination and growth of spores

1. Moisture: it is a necessary condition for spore growth. As long as there are dust and hydrophilic substances on the surface, spores can absorb sufficient moisture from the atmosphere

2. Humidity: when the relative humidity is lower than 65%, spores will not sprout and grow, but when the humidity is higher than 65% and the higher, the faster the mold grows. However, spores can survive for a long time when the relative humidity is below 65%. Even though most of the molds have died, once they encounter the humidity suitable for their growth, they will sprout and grow rapidly

3. Nutrients: in addition to high humidity, a water absorbing layer will be formed on the spore surface. Once a water absorbing wet layer is formed, most organic materials can provide organic nutrients for the growth of a small amount of molds. Organic dust itself contains sufficient nutrients for the growth of molds. Places with poor air circulation and ventilation are more conducive to the production of molds

4. Temperature: the best growth temperature is 20-30 ℃, but a few spores can grow below 0 ℃ or 40 ℃, and many mold spores will not be damaged below 0 ℃ and above 80 ℃

from the above analysis, it can be seen that the above four conditions must be met for any article to become moldy:

First: there is mold or spore

second: the humidity is above 65% relative humidity

third: organic matter with nutrients for mold growth

fourth: the temperature is 20-30 ℃

Director Li Jigong:

next, let's analyze your project case. What wallpaper products do you use

dealer customers:

this phase of the project uses pure non-woven paper products, some of which are domestic non-woven paper, and the other is imported non-woven paper

Director Li Jigong:

are the rubber powder and base film used in construction mold proof

dealer customer:

Yes

director Li Jigong:

How was the weather during the construction? Can the ambient temperature and humidity meet the requirements

dealer customer:

during construction, the temperature is not very high, and the humidity cannot reach the humidity of more than 65% of the relative humidity

director Li Jigong:

is the wall completely dry

dealer customer:

it should be completely dry and meet the requirements

Director Li Jigong:

under these conditions, there should be no mildew on the wallpaper

dealer customer:

the wallpaper used in our project is a large area of mildew after the completion of construction and one year of use. One special case is that in the season of mold last year, there was a special weather condition in this area. It has been raining for more than 30 days without sunny days, and mold was found in some household wipes. But at the same time, there are non-woven wallpaper products and PVC wallpaper products under construction, and the PVC wallpaper has not been moldy

Director Li Jigong:

then do you want to take off the wallpaper and see if the wall is very wet

dealer customer:

we have also done wallpaper sales for a long time. At that time, we also thought that the waterproof of the wall was not done well. It was soaked into the wall through the wall surface in rainy days, and the rubber powder or base film became moldy after a long time of being too wet. However, when we took off the wallpaper, we found that there was no mold on the wall, but only mold on the surface of the wallpaper. That is, unlike before, wallpaper was infected by mold on the wall. This time, only the exposed wallpaper surface is moldy

director Li Jigong:

Oh! Let's analyze it like this: the most special detail in your description is that some rags are moldy, while the surface of PVC wallpaper is not moldy

first of all, the dishcloth is moldy, which proves that mold already exists, the environment is very bad, and the conditions that are very conducive to mold growth are reached. Three of the four conditions have temperature, humidity, mold or spores, and there is only one nutrient substrate

secondly, only non-woven wallpapers are moldy, while PVC wallpapers are not moldy. As a non-woven paper product, the wallpaper itself is a porous network fiber structure, and the surface can absorb dust, so it provides an environment conducive to the growth of mold. When there is an environment where the air is not circulating and the temperature and humidity are suitable, mold is very normal. Originally, due to its porous structure and good air circulation, non-woven wallpaper will volatilize the excess water caused by the wall or construction, so as to avoid the infection of wallpaper due to the moldy wall, colloid or base membrane. However, under special circumstances, moldy wallpaper has become an inevitable phenomenon in the above-mentioned bad weather

one after another, PVC wallpapers are shining, while non-woven wallpapers are ugly

since the last issue, the engineering wallpaper has been seriously moldy in bad weather. Tupley has answered the relevant details and reasons for moldiness for you. In this case, it is also mentioned that PVC wallpaper is not moldy, but only non-woven wallpaper has moldy spots. What is the reason? Here are the mysterious details for you

interview record: Issue 2

dealer customer:

why is the surface of PVC wallpaper not moldy

Director Li Jigong:

the surface of PVC wallpaper is not moldy because it lacks the nutrients for spore growth, so there is no moldy problem under the same temperature and humidity environment

therefore, after understanding the causes, we can fundamentally solve similar problems in this region

first: first, ensure the waterproof performance of the wallpaper and ensure that it does not mildew during construction

second: in case of the above extreme weather, be sure to maintain air circulation. If conditions permit, turn on the air conditioner, maintain air circulation, and dehumidify to keep the room dry

third: you can use a vacuum cleaner to strongly clean the surface of wallpaper. If you don't want to be so troublesome, another way is to use mold proof non-woven wallpaper while ensuring the use of mold proof adhesive and base film

dealer customer:

where is a reliable mold proof rubber powder and mold proof base film

director Li Jigong:

tupley has jointly developed and customized mold proof adhesive powder and mold proof base film with relevant institutions, which you can buy with confidence, because it is sold together with our wallpaper

dealer customer:

where is the non-woven mold proof wallpaper? I haven't heard of it yet

director Li Jigong:

there was no such thing before. Now, based on the feedback of customers, tupley wallpaper company has developed non-woven mold proof wallpaper for customers in the above regions, such as southwest, South China, East China and other customers with similar situations

dealer customer:

has it been verified

director Li Jigong:

the non-woven mold proof wallpaper has obtained the inspection certificate from the relevant institutions. The inspection results show that under extremely bad weather conditions, such as 28 ℃, 90% humidity, after 28 days of severe tests, there is no obvious mold when the standard is amplified by about 50 times, which belongs to the highest standard level 0 of this test

dealer customer:

is it environmentally friendly

director Li Jigong:

tupley wallpaper adopts the most environmentally friendly antibacterial agent in the world, so that customers will no longer be bothered by the mildew of wallpaper

dealer customer:

does this antibacterial agent affect the appearance of wallpaper

director Li Jigong:

If mold occurs, it can be treated later, and the best fungicide will have a certain impact on the surface of wallpaper; However, mold proof wallpaper is added with antibacterial agents in the production process, which will not have an aesthetic impact on the surface of the wallpaper

dealer customer:

do you still use ventilation, dehumidification or air conditioning cooling and vacuum cleaner to clean the surface with mildew proof wallpaper

director Li Jigong:

it will be better to be able to use mold proof wallpaper and follow the above methods, which will prolong the service life of mold proof wallpaper

dealer customer:

how long can mould proof wallpaper be used

director Li Jigong:

under the condition of correct maintenance, it can be used for 3-5 years. Mainly through the performance and test effect calculation of mold inhibitor

a new strategy for mold prevention of wallpaper in case of a rainy day -- construction details that cannot be ignored

cure the symptoms but not the root cause - this is the main reason why many wallpapers are moldy. No matter in the bad plum rain season or in the extremely humid environment, as long as our preliminary work and maintenance are done well, wallpapers can still be colorful and graceful

interview record: phase 3

attention during construction:

try to avoid construction in the weather where high temperature and high humidity factors exist at the same time. It is impossible to avoid construction in the weather of high temperature and high humidity. After the construction is completed, it is required that the wall paper glue can be completely cured within 7 days after the construction is completed. That is to say, if ventilation is required but there is no draught, the edge of the wallpaper will be warped

therefore, during construction, mold prevention should be solved from these aspects:

1. The project should prevent rainwater from entering the inner wall from the windowsill, terrace, sewer pipe, etc. from the outer wall. The above rainwater can cause the wall to be wet and mildew the wallpaper. (moisture proof)

2. The back wall is an indoor bathroom, water room, etc., which should be fully waterproof, otherwise it will cause the next wall to be wet and the wallpaper to mildew. (moisture prevention)

3. The central air conditioning system should also keep the pipes warm. If condensation occurs in the cold water pipes and water accumulates, it will also increase the humidity of local internal walls and mildew the walls. (moisture proof)

4. During wallpaper construction, the construction personnel should scrape out the excess colloid on the wall and leave adhesive film. Excess glue

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