ã€China Aluminum Network】 1 To purchase invisible screens, we must first look at the profiles. Now the market is mainly divided into aluminum alloy and steel products. The main market for steel profiles is engineering. Aluminum alloy profile market is divided into two aspects of engineering and home improvement, engineering screen window warranty period of about 2 years, home improvement screen warranty period will be longer.
Recommendation: The owner should look at the strength of the aluminum alloy when selecting enough screen doors and windows because there is a big difference in the thickness of the profile.
2 The difference between bearings: bearings are divided into domestic bearings and imported bearings.
Suggestion: Because Beijing has more wind and sand, the domestic bearing is an open type bearing. If you enter the dust, it will be unfavorable. It is better to purchase imported silent bearings.
3 Spring Selection: Springs are divided into window springs and door springs.
Suggestion: Because it is an invisible accessory, in the installation of the screen door, use a few hands to look at the rewind effect. If the rollback is too sluggish, it may be a window spring for you.
4 Differences in gauze: The gauze is divided into a glass fiber web and a polyester coated chemical fiber web.
Suggestion: Glass fiber mesh is mainly used for engineering purposes, and a small amount of home improvement is used. Polyester-coated chemical fiber webs are mainly used in homes, and projects in some areas have been banned.
5 The design of screens: Because the height of the windows is too high and the width is too narrow, it is inconvenient for you to use the screens. For example, too high to pull down is too strenuous, the gauze is blown out by the wind, there is the magnetic screen window can not suck automatically rolled up and so on.
Suggestion: If your home window is more than 1 meter 2 wide. When you are ready to order, designers are required to design side pull styles. Not only is it light and it does not cause the above reasons. It will also increase the service life of screens. Because the screen window is pulled out relatively short, the screen accessories are relieved. Basically, it will not cause any trouble during the warranty period, but it will increase the cost of screens, so the price will be higher. The windproof method chooses the brush or the piece windproof as far as possible, has solved the gauze net easy to come out the difficult problem.
6 screen door design: because the lower track is often stepped on foot, so pay attention to the profile in the purchase of the screen door should be thick.
Suggestion: After the width of the screen exceeds 1 meter 2, install the pull screen door. Because of the single-sided pull-screen door, the rewinding is not smooth at this time.
7 The color of screen doors and windows: Because the colors of doors and windows are complicated, it is necessary to pay attention to whether the quality of the inspection color after the purchase of screen doors and windows is not faded or dropped.
8: Invisible screens are difficult to clean because it is difficult to clean them. In the past, it was very difficult to clean the screen surface with dust and plush using a single-top-top cleaning gauze. The live type of yarn (which can be easily taken out and removed directly) is given Users bring security risks and troubles. Wendi's free-standing and self-cleaning invisible screen window is equipped with a brush at the opening of the screen box, and automatically cleans dust and lint on the surface of the screen when the screen is pulled down. This completely solves the problem of invisible screen cleaning.
Reverse osmosis water treatment agents are suitable for aromatic polyamide reverse osmosis membranes, hollow fiber membranes, and nanofiltration (NF) and ultrafiltration (UF). Excellent cleaning results can extend membrane run time.
Use the cleaning device to clean the system online. The steps are as follows:
1. The system is cleaned by reverse osmosis demineralized water for 3-5 minutes;
2. Check the cleaning tank, hose and precision filter and install a new filter if necessary.
3. Calculate the amount of cleaning drugs according to the system and membrane arrangement.
4. Inject the reverse osmosis water or demineralized water into the cleaning tank to the appropriate amount.
5. Slowly add the calculated dosing amount.
6. Adjust the pH of the solution to 2.0 using ammonia (NH3) or Hyde Energy HY-430.
7. Circulate and wash for 30 minutes under water pressure of 0.1Mpa (soaking effect will be better after soaking for 30 minutes); the cleaning flow rate should be recommended by the membrane manufacturer or system supplier.
8. If the pollution is serious, please drain the first return water (up to 15% by volume) to prevent redeposition of the pollutants.
9. If the cleaning solution becomes cloudy or the pH value exceeds the specified range, it is necessary to reconstitute the cleaning solution;
10. During the cleaning process, the pollutants will consume the cleaning chemicals, the PH value will change accordingly, and the cleaning ability of the medicine will be reduced. Therefore, it is necessary to monitor the change of pH value at any time and adjust the PH value in time.
11. Soak the membrane element in the cleaning solution, which is a very effective way to dissolve metal dirt. It is recommended to repeatedly soak and alternate the circulation of the water.
12. For multi-stage systems, each section should be cleaned separately for maximum effect.
13. Before the system is cleaned and re-commissioned, flush the system with low pressure until no more cleaning liquid remains in the system.
Reverse Osmosis Water Treatment Agent
Reverse Osmosis Water Treatment Agent, Water Treatment Agent, Water Treatment Agent Supplier
Jinan Huijinchuan Chemical Industry Co., Ltd. , https://www.hjcchemical.com