The grinding of the wall refers to the polishing of the putty after the putty has been scraped on the wall, in order to make the wall surface more even and the surface more detailed and uniform. Do not look at this process in the entire decoration process does not matter, in fact, the quality of the wall directly affects the quality of the late emulsion paint effect, if the smooth wall polishing then Latex paint effect will be very perfect, this set of procedures is to fight Basic, but also essential.
The grinding of the wall refers to the polishing of the putty after the putty has been scraped on the wall, in order to make the wall surface more even and the surface more detailed and uniform. The polishing of the wall is not only related to the final flatness of the wall, but also an important means to solve some minor flaws in the wall decoration. Many of my classmates learned that they had a certain understanding of shoveling wall coverings, patching, and puttying. However, the understanding of wall sanding is not common enough. This has led to some problems. Today, I concentrate on explaining here. I hope Can help everyone!
| First, why do you want to do wall polishing? |
1, although the main role of putty is leveling, but only scraping putty, only half of the leveling work, the other half, but also to determine the final effect of half, to be polished to solve. This is also the main function of wall polishing.
2, putty scraping process, it is inevitable that there will be some minor flaws, such as putty joints at the junction, the local shaved thin or thick traces left behind, wall holes caused by water absorption, these can also be passed Wall polished to solve.
3. The surface structure of the putty after the overall polishing is more uniform, which can enhance the performance of the latex paint, and avoid some problems that may be caused due to the difference in the surface structure (such as local color difference of the paint, etc.).
| Second, what tools are used to polish the wall? |
Here are two key tools: light bulbs and sandpaper.
1, light bulbs.
In order to be able to observe the smoothness of the wall at any time, the workers usually have to hold a light bulb in their hands during the day and night. The wattage of the bulb is generally more than 200 watts, so that even in the daytime, the smooth condition of the wall can be observed.
2, sandpaper.
The selection of polished sandpaper is a concern for everyone. I will talk about it here.
There are 80, 120, 180, 240, 320, 400, and 600 meshes of sandpaper commonly used in wall grinding (grit per inch). Among them, 80, 120 can be classified as coarse sandpaper, 180, 240 medium, and 320 or more fine sandpaper.
Abrasive paper is too thick, which can easily lead to scratches. The sandpaper is too fine to be polished. Therefore, the choice of wall sandpaper is not as thick as possible, nor is it as fine as possible. It is appropriate to match the wall putty. .
In practice, we must first be able to do a good job as the first choice for the smoothness, wall grinding and more 240,320 first try, if not very hard to polish, you can do a good degree of flatness, then continue; If you feel that grinding is difficult, switch to low-mesh coarse sandpaper and try again. Under the premise of ensuring the smoothness of the wall, if the first pass uses coarse sandpaper, generally the whole or part of the sandpaper also needs to be sanded again with fine sandpaper to eliminate the scratches left by the coarse sandpaper and make the wall more detailed.
According to putty quality. Non-water-resistant putty is relatively easy to polish due to loose surface structure, and it is generally used with sandpaper of 240, 320 or higher. However, because most of the non-water-resistant putty are of poor quality, the mesh of the powder itself is generally low, so Even with high-grade sandpaper, it is difficult to play a very detailed feeling. The surface structure of water-resistant putty is relatively firm, and it is much more difficult to grind than non-water-proof putty. Especially some high-strength water-resistant putty, if wait until the putty is completely dry and then polished, it is very difficult. At this time, it needs to be smoothed with coarse sandpaper. Do a good job, and then use the fine sandpaper a second time in order to achieve better results.
| Third, how to identify the decoration team through the wall polishing? |
Although many students have realized the importance of putty, and many honesty teams inside the jars will also advocate the use of water-resistant putty from the perspective of consumers, but in terms of the overall market environment, there are still many black-hearted teams who will bully the owners and do not understand Use non-water-resistant putty at the owner's home.
Why do you know that water putty is good, but they are not willing to use it? Some people say that because of water-resistant putty expensive, this is only one reason, the main reason is that because of non-water putty good sanding, and water-resistant putty grinding more laborious!
The same wall, using a non-water-resistant putty, can be easily polished in just 0.5 days, and using a water-resistant putty can require 2 days of hard work. Due to the huge difference in labor costs, many black-hearted teams could not resist the temptation to take the risk, and eventually chose non-water-resistant putty.
If you encounter a team that always emphasizes how bad the water-resistant putty is, especially if it's not good to polish (this is their true word), then you are more careful, and when they say so, it's not your home. The quality of the project!
| Fourth, see the inspection report to understand the putty polishing performance! |
All putty products that are allowed to be sold in the market must pass the requirements of the "China Construction Industry Standard Building Interior Putty" (JG/T 3049-1998) standard. In the standard, the requirements for sandability, water resistance, alkali resistance, and adhesive strength of putty have been made. Among them, the most relevant to the wall surface grinding is the grinding property and the bonding strength.
Let us explain in detail the test report:
1, polished.
The official inspection of the grinding properties has strict operating procedures and requires the use of a dedicated grinding tester for testing.
The sandpaper used in the sanding test was 120 mesh (No. 0), and it was reciprocally rubbed 5 times on a putty-like plate. The final indicator was: "Abrasive powder stained on a visually-ground sanding paper is 20% to 80% of the sandpaper area as acceptable."
In theory, products that pass the grinding test are all manually hand-polished.
It is worth emphasizing that the putty test of putty is done on the second day of scraping putty (maintenance for 1 day under standard conditions). Usually, the best polishing time for putty is within 3 days after putty is put on the wall. , especially water-resistant putty, after a long time putty dry, grinding will be more difficult. From the inspection report, the wearability of the Biyu jade lining (35) was slightly better than that of a certain brand of similar products (30) one day after the scraping.
2, adhesive strength.
Bond strength is divided into two types, one is the standard state, the industry is called dry strength, and the other is the state after water immersion, the industry is called wet strength.
Different from the test wearability, the time for testing the bonding strength is at least 7 days after the scraping (dry strength is 7 days for maintenance, and the wet strength is 7 days for dry strength, plus 4 days for 11 days). .
In the bonding strength, the state after water immersion is measured in accordance with the N-type standard (and water-resistant putty). The so-called soaking is completely immersed in the water for 48 hours. The putty that is not water resistant cannot be measured at all, and is directly foamed after being immersed in water. , shedding.
After the water-resistant putty is completely dried (after 7 days), the adhesive strength is high and the surface structure is firmer, making it difficult to grind. The higher the adhesive strength, the more so putty.
The first of the above two inspection reports is the inspection report of LN800 high-grade water-resistant putty. From the test report data, we can see that the bond strength is more than 2 times the national standard, and it is 30% higher than that of a brand of similar products. Therefore, after the putty is completely dry, the Biyu jade lining is even more “ Hard, it's harder to polish some.
For the construction party, using this "high-strength" water-resistant putty, if the putty is completely dry (more than 7 days), it can't be moved directly with fine sandpaper. At this time, you need to use the 120-grit sandpaper first to make the first pass, and then use the finer sand paper of 360-mesh to do the precise play, so as to ensure the final result. For the owners, such products are more resistant to water, more robust, and have a longer service life. If the decoration team is willing to use this product for us, it is definitely worth fortunate!
In summary, the final summary of the wall polishing:
1. Wall sanding is a very important part of the wall decoration and an important means to improve the smoothness, level of detail and final effect of the wall surface.
2. Whether it is day or night, when the wall is polished, in order to be able to observe the flatness of the wall at any time, we must hold a bulb of at least 200 watts.
3, the choice of wall sandpaper, not the thicker the better, nor the more fine the better, generally try to start from the fine sandpaper, do not change the coarse sandpaper, but in the end also generally use fine sandpaper and then re-polished again To ensure that the wall is fine and free of scratches.
4, good team in order to improve the life of the owner's home wall, will recommend the use of water-resistant putty, even if the grinding is a little difficult, and the black heart of the team will use a variety of excuses to refuse to use water-resistant putty, everything is only starting from their own efforts, not Think for the owner.
5, putty grinding, in the test report has been withdrawn, of which "sharpening" is a test putty scraped 1 day, usually, water putty is best carried out within 3 days after the wall Polished, this time the strength is low, the surface structure is not yet solid, it is more labor-saving to polish.
6. After the putty is completely dried (after 7 days), the bonding strength is high, and the surface structure is firm and it is difficult to polish. In order to obtain better results, you can first use 120-gray sandpaper to grind the first pass, and then use 360-gross sand paper to polish the second pass.
7. The adhesive strength of putty directly determines the service life and water resistance of the future. Under the conditions permitting, the long-term cost-effectiveness of using water-resistant putty with higher bonding strength is higher.
Summary: Everyone saw this article will be able to easily understand the wall polishing process, if it is a bad wall polishing follow-up there will be many problems, so in this stage of playing the foundation must grasp the various procedures Harmony and perfection. If you still want to know more about this knowledge, we suggest that you pay attention to this website information channel, and more valuable information is waiting for you.
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