The original way of ordering mosquito-repellent incense decades wrong? To see the truth

Group 2: do not split, put mosquito - repellent incense rack point, automatic separation

 

Group 3: split, put mosquito - repellent incense rack point, burn the fastest

"A mistake has been made for decades. It turns out that the mosquito-repellent incense does not need to be separated at all "There are so many mosquitoes in the summer that many families will order mosquito repellent incense to keep them away, especially in these wet and cloudy days. We grew up, the most common way is to take the mosquito coil incense and split it in two and then order one of the dishes. However, these two days, in the WeChat circle of friends, a post about mosquito-repellent incense does not need to be opened, but also can burn well is widely circulated. The post said, as long as the point of mosquito-repellent incense when not lit another plate can be. The other plate will not burn in the course of combustion. Is it true? Yesterday, the modern express did an experiment.

Reporter experiment

Mosquito-repellent incense can still be burned in a circle without splitting

The modern express reporter first bought a box of mosquito-repellent incense made in zhejiang province from a supermarket in qingshi street, xinjiekou, nanjing. The mosquito-repellent incense lasts until 2019. Reporters in the same corner of the office, divided into three groups for the lighting experiment:

In the first group, the mosquito-repellent incense was undivided and placed directly in a mosquito-repellent tray.

In the second group, the mosquito-repellent incense is unopened and placed on the supporting mosquito-repellent incense rack.

In the third group, the mosquito-repellent incense was separated and placed on a mosquito coil to ignite.

Two hours later, the reporter sees, split up after the combustion of the third group is the fastest mosquito-repellent incense burning, burn to about one-third of the mosquito coil, and burning very brightly, red fire, and smoke. Without split between, on the tray of the first group of mosquito-repellent incense burning speed is slow, can burn to the second circle of about 1 cm, not on either side of the adjacent lit mosquito-repellent incense, but automatically out. And the second set of mosquito-repellent incense on the mosquito coil, although the combustion speed is not as fast as the separation, but always along the path of the mosquito-repellent incense, a circle of orderly burning. This proves that the circle of friends said, "the mosquito coil incense does not need to be separated at all, directly lit, burned one plate, the other automatically separated."

Manufacturers claim

Use mosquito-repellent incense

You can do it without breaking it up, but you have to watch out for fire.

Has it been a mistake for us to break down the mosquito coil and light it? A netizen posted on WeChat that he broke countless mosquito-repellent incense over the years, often breaking it, it is too wasteful. However, the reporter then took a close look at the use of mosquito-repellent incense packaging box. It clearly reads, "separate the mosquito-repellent incense from the center and place it on the supporting mosquito-repellent rack after lighting. Please put it in a ventilated place to ensure the use effect." On the front side of the box is also clearly a sheet of mosquito-repellent incense that has been removed and then lit.

What is the correct solution to this? Yesterday afternoon, the modern express reporter contacted the production of the mosquito-repellent incense zhejiang zhengdian industrial co., LTD. Staff Mr. Liao. He said the mosquito-repellent incense can burn without being opened, and the repellent effect is the same as that of the unopened mosquito. "Only, if someone accidentally set fire to the both sides, then it is likely that they will both burn together, and finally form the fire wheaten cake joins camp, and let a whole plate quickly burn that that everyone apart than usual again lit, will waste a lot of."

Mosquito-repellent incense design

"Yin and Yang supplement" can save space and reduce costs

Mr. Liao told reporters that the coil design of mosquito-repellent incense is in fact following the traditional design method. The reporter noted that in 1888, a Japanese man called inichiro yamashita a wire-maker and spent two years developing the world's first rod-shaped mosquito-repellent incense. But this kind of appearance similar to a joss stick of mosquito-repellent incense, at most can only continue to burn an hour, if you want to burn a long time will be longer length of mosquito-repellent incense, and easy to break, up the hill's wife suggested to swirl. After repeated testing, the process of rolling two thick mosquito-repellent incense sticks into a swirl was worked out on the mountain, centered around a round bar. 1902 the whirlpool mosquito-repellent incense went on sale.

Mr. Liao said the mosquito-repellent incense design is also "Yin and Yang complement". Such a design, he said, would save a lot of space and would not break easily in transit. 'there is a no-tear-down mosquito-repellent incense on the market,' he said. 'they also produce it, but it's expensive because of the high cost.'

Expert opinion

Why can undivided mosquito-repellent incense burn in circles?

Because the side temperature is below the ignition point, it's not enough to light the adjacent mosquito-repellent incense

The reporter sees on the net, a lot of curious net friend also did not break up the experiment that mosquito-repellent incense ignites spontaneously. Some also bought different brands of mosquito-repellent incense and conducted multiple experiments. Some brands of mosquito-repellent incense do not break up, after the ignition can indeed spiral down to the end of the experiment, as the reporter did. Some of the mosquito-repellent incense will be ignited together with the surrounding mosquito-repellent incense, and eventually the entire plate will be burned. Why is that?

This has something to do with the quality of mosquito-repellent incense, said gao wei, a professor at the university's school of chemical engineering. "Mosquito-repellent incense requires three conditions: one is flammable, the other is oxygen, and the third is temperature." Journalists, he said, do the experiments of mosquito-repellent incense, under the condition of not split, why would one end of the burning along the spiral has been burned, by the second ring, even between root mosquito-repellent incense will not lit mosquito-repellent incense on both sides. That's because "the burning part is not very hot, and the side is below the firing point, so it's not enough to burn the adjacent mosquito-repellent incense."

According to gao, mosquito-repellent incense is not an open flame after burning, unlike the fire of matches or lighters, floating in the air, the temperature is relatively high. And the surface of the incense to the side of the spark is not enough to ignite the next side of the incense, "so you will still burn around the incense in a circle." There is an instrument in the chemistry laboratory of nanda that can test the hottest spot and side temperature of mosquito-repellent incense.

So why did the reporter in the experiment, did not split the mosquito-repellent incense put in the tray to burn about 1 cm in the second circle, will automatically extinguish? According to gao wei, it may be that the mosquito-repellent incense is of poor quality, or that it is damp. "It may also be that it is sandwiched between two mosquito-repellent incense sticks, resulting in less oxygen and automatic extinguishing."

remind

Mosquito-repellent incense has low toxicity

Wash hands after touching

Yesterday, there was another piece of news about mosquito-repellent incense on the Internet, saying that "mosquito-repellent incense is a pesticide and should be used for no more than 8 hours at a time". It also said, "according to expert introduction, mosquito-repellent incense, insecticidal aerosol, electric mosquito-repellent incense, electric liquid mosquito-repellent incense, mosquito repellent toilet water, etc., belong to health pesticides, is a class of pesticides, must pay attention to using method. Mosquito-repellent lozenges (liquid) contain pesticides that are low in toxicity but should also minimize direct touching.

The reporter is doing mosquito-repellent incense experiment after about 6 hours, already felt the eye sends acerbity, and the temple is raw ache. Colleagues at the next table also felt a sore throat from the mosquito-repellent incense. Is this a toxic substance inhaled after the use of mosquito - repellent incense? The reporter had a close look at the product performance on the mosquito-repellent incense packaging box, it said, "this product USES chlorfluranethrin as the effective component, effectively drive away mosquitoes. "In the notes, seven were written, the second of which was" poisonous to fish and silkworms. It is forbidden in or near the silkworm house. Article 5 "wash hands after use" and article 7 "it is forbidden for allergic persons. If there is any adverse reaction during use, please consult a doctor promptly."

Mosquito-repellent incense manufacturers, zhejiang excellent industrial co., LTD. The staff Mr. Liao told reporters, mosquito-repellent incense is really belongs to the ministry of agriculture control, column under the pesticide, belongs to the level of WeiDu, allergic constitution of the people should be careful.

Gao wei, a teacher at the school of chemistry and chemical engineering at the university of south China, also said that mosquito-repellent incense is a component of pesticide and is low in toxicity. "The general class of pyrethrin is better for mosquitoes. After a long time, the average person will not react. If you're allergic, you can get red, itchy skin in severe cases and even kill people. But the chances are slim.

Teacher gao suggested that the point of mosquito - repellent incense as far as possible do not touch the skin, to timely wash hands. "Try to make sure the mosquito-repellent incense is safely lit. People go out first, and when they come back, open the window of the room in time."

Small coup

There are tips for breaking down mosquito-repellent incense

The reporter experiment discovers, break up mosquito coil incense to burn a situation better than do not break up actually mosquito coil incense, it is more laborious when early break up. In fact, if the mosquito-repellent incense is of good quality, it is not easy to break apart. "The trick is to break down the mosquito-repellent incense, not directly from the middle, but first in the middle, and then at every break point around the circle, so it's easy to break apart." He also suggested that a dish of mosquito-repellent incense can be lit in a room of 25 square meters, which has a better repellent effect. "It's best to keep the air ventilated because the air flows slowly in a closed environment."