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How to clean dirty wallpaper? 1. Vinyl wall paper. Vinyl wall paper has a thin layer of PVC coating on its surface, which makes maintenance and cleaning relatively simple. It can be cleaned by wiping it with clean water or a plain, damp towel; if there are stubborn stains that cannot be removed, a neutral cleaning solution diluted in water can be used for cleaning. 2. Pure paper wallpaper. Pure paper wall paper does not have a PVC coating for protection; it can only be wiped gently with a sponge or a colorless, clean damp towel, making sure not to use too much water. If the wallpaper has obvious stains, it should be cleaned gently; do not scrub it too hard to avoid damaging its surface. 3. Flocked wallpaper. Flocked wallpaper can be cleaned regularly by gently brushing it with a feather duster, or by using a vacuum cleaner or a brush dipped in clean water. For dirty areas, gently wipe them with a damp sponge that has been squeezed out, dipped in a diluted cleaning solution. 4. Foamed wallpaper. Foam wallpaper is soft and thick, with an elastic, textured surface that features patterns such as reliefs or wood grain. The uneven surface of foam wallpaper makes it prone to dust accumulation, so it should be cleaned regularly to maintain its appearance. It is advisable to clean it every 3–6 months; a vacuum cleaner or a brush dipped in clean water can be used for cleaning, taking care not to let water seep into the joints. 5. Fiber wall paper. Fiber wall paper is a type of recycled wall paper whose materials come from natural sources such as trees, grass, and bamboo; therefore, it cannot be cleaned by brushing, and dust must be removed using a vacuum cleaner or a duster. Product introduction of the wallpaper width measuring instrument, LPBK1400 series sheet width meter: The LPBK1400 series sheet width meters can be used for real-time width measurement in the production of various sheets and films. Measurement principle of the LPBK1400 series sheet width measuring instrument: When using a dual-optical-tube photoelectric probe to measure the width of the adhesive sheet, two sets of such probes are installed on either side of the sheet, and the distance between the centers of these two sets of probes is a fixed value that has been calibrated. When the adhesive sheet passes through the measurement area of the probes, the signal from the imaging positions at the edges of the sheet is captured by the acquisition circuit and sent to the industrial computer for processing, thereby allowing the width of the adhesive sheet to be determined. Equipment parameters of the LPBK1400 series sheet width measuring instrument: 1. Measurement range: 800~1400mm 2. Measurement accuracy: ±0.02mm 3. Measurement frequency: 1000Hz 4. Repeatability accuracy: 0.02mm 5. Operating voltage: ~220V±15% 50Hz 6. Ambient temperature: -20℃~+45℃ 7. Ambient humidity: less than 85%RH Main functions of the LPBK1400 series sheet width measuring instrument: 1. Real-time measurement of sheet width ； 2. The measurement width can be adjusted arbitrarily within the range of 800~1400 mm ； 3. It features an over-limit alarm function, with the alarm range being adjustable ； 4. Features external display capability ；