Traditional incense is made of elm bark, which is crushed and ground, then a small amount of fine powder of crushed and ground crop stalks is added, and a proper amount of water is added to stir, then it is put into a tubular mold, and then it is extruded into thin strips with the same shape as incense, and then it is cut and dried.
Elm bark plays an adhesive role. Followed by plant fiber, flammable.
Adding a small amount of fine powder of crushed crop stalks to save raw materials of elm bark. Because the raw material cost of elm bark is relatively high.
Disc mosquito-repellent incense making
Mosquito-repellent incense, invented in 1880, has been used for more than 100 years, and has always been a necessary commodity for mosquito repellent at home. It mixes effective insecticidal components with combustible substances such as wood flour, and then slowly burns for a certain period of time to disperse the effective insecticidal components. When such effective components reach a certain concentration in space, they can stimulate, drive away, paralyze, knock down and kill mosquitoes.
Mosquito-repellent incense used to be a thin stick called thread incense, which is about 30 cm long and can be lit for an hour. Now it is spiral, so it is called disc mosquito-repellent incense, with a total length of 130 cm, which can be ignited for 7-8 hours. The ignition point of mosquito-repellent incense is as high as 700-800℃, but the temperature of the back 6-8 mm is about 170℃, which is exactly the volatilization temperature of insecticidal active ingredients in mosquito-repellent incense, and it is also the temperature at which the essence volatilizes very quickly.
First, the mosquito coil incense.
Mosquito-repellent incense, as a kind of insecticide directly used in rooms, must ensure the quality, effectiveness and safety of the products.
Machine: Hydraulic press and incense winder (dual mode) can wind the thread incense pressed by the hydraulic press into the required shape with the incense winder.
Second, the production process
On the surface, mosquito-repellent incense can be divided into black, green and yellow. Although there may be only different pigments, there are still differences-different materials, different formulas, different costs, and different sizes of smoke after combustion. Therefore, to produce high-quality mosquito-repellent incense, we should not only have a reasonable formula, but also choose various materials.
★★★★★ Black mosquito-repellent incense needs carbon powder, which is often alkaline and will reduce the efficacy of pyrethroids. Therefore, when producing black mosquito-repellent incense, we should pay attention to the pH value of its powder; Especially smokeless mosquito-repellent incense, because it is smokeless after being lit with carbon powder instead of wood powder, it may be more alkaline. It should be noted that smokeless black mosquito-repellent incense is more "environmentally friendly" and won't make the room smoky, but the materials used are the most exquisite. Less toner will smoke, and more will affect the flexural strength and burning time. In addition to mastering the dosage of toner, it is also necessary to treat toner with nitric acid to make it slightly acidic when the pH value is less than 7. Moreover, the by-product potassium nitrate (or sodium) has combustion-supporting effect, which is beneficial to improve the quality of smokeless mosquito-repellent incense. ★★
Third, the choice of basic materials.
1. Commonly used bonding materials are: elm bark powder, viscose wood powder, a- starch and others (such as methyl cellulose).
2. Adhesive materials should pay attention to both its viscosity and its acidity and alkalinity. Because the effective components of pyrethroids are easy to decompose under alkaline conditions, they should be mainly acidic, with particle size of 80- 150 mesh and dosage of about 16% of the total base material.
3. Commonly used plant powders: cypress powder, pine powder, Chinese fir powder, pyrethrum powder, coconut shell powder, etc.
4. The particle size of plant powder is between 80- 150 mesh, which can keep the surface smoothness of mosquito-repellent incense and the compactness of mosquito-repellent incense strips, thus ensuring that mosquito-repellent incense has a certain strength, the density is 0.73-0.80g/cm3, and the burning speed reaches1.7-2.0g/hr. If the particles are too coarse, the surface of mosquito-repellent incense will be rough. Too much dosage makes the incense stick burn too fast, and a large number of effective components volatilize, which is quite uneconomical. Too little dosage, poor combustion, leading to suffocation. Generally, an appropriate amount of potassium nitrate should be added as an accelerant to prevent mosquito-repellent incense from smoldering when it is ignited, and the dosage is generally between 0.5%- 1.0%. In the production of green mosquito-repellent incense, 0.2% malachite green should be added, and 0.025%-0. 100% mildewproof agents such as sodium dehydroacetate and benzoic acid should be added.