Development History of Dry Mortar Part Two

Dry mortar production originated in Austria and Finland. With the continuous improvement and improvement of the quality of wall material products, the wall is becoming more and more smooth, and it is no longer necessary to apply thick mortar to level the wall, only a very thin mortar can meet the purpose of wall plastering, and it is difficult to produce thin mortar in the field. Therefore, a Finnish company began to develop dry mortar products for thin layer mortar in 1958, began production and put into use in 1961, during which Germany also began to produce dry mortar.

The development of dry mortar has undergone many changes in its production form since its inception. In the 1960s to the early 1970s, the dry powder mortar plant in Europe is a horizontal process, that is, each raw material silo is arranged on the ground, the raw material first enters the respective silo storage through the lifting equipment, the raw material released from the silo is weighed through the horizontal conveying equipment into the mixing machine, and the product storage bin is lifted after coming out. Finally, after packaging, bulk process factory. This way has become the first generation of dry powder mortar production plant, the main disadvantages are that the material needs to be repeatedly lifted and lowered, the equipment used is more, the energy consumption is high, the floor area is large, and the operation flexibility is poor. In the 1970s and 1980s, the second generation of dry powder mortar production plants appeared, and the idea was to simplify the entire process, that is, the material was raised to the height and dropped at once. Therefore, the plant is designed as a tower, the raw material warehouse is built on the top of the tower, and the process of ratio weighing, mixing, packaging, bulk and other processes is carried out under the warehouse, and the raw material is discharged from the warehouse through various processes to become the final product. Compared with the first generation of mortar plant, the second generation of dry powder mortar plant has the characteristics of small ancient area, simple structure and less equipment, but the shortcomings are that the use of screw feeder dosing, equipment maintenance workload, and the outlet of the silo often occurs blocking phenomenon, affecting the normal production. In the 1990s, due to the invention of pneumatic floating plate technology and the appearance of double butterfly valve, the third generation of dry powder mortar production plant came into being. This production plant using pneumatic floating plate and double butterfly valve batching technology, the material completely relies on its own gravity flow, the entire production process has no horizontal conveying equipment, the structure is more intensive, the floor area is smaller, the equipment used is more simple and reliable, low energy consumption, faster production speed, and higher batching accuracy.

In Europe, the benefits of this development are clear. Since the 1960s, many modern dry-powder mortar production plants with a output of millions of tons have been established. The promotion of dry mortar production and application technology and the use of mortar silo transportation and mechanical spraying have made the use of paint mortar and plaster mortar in Germany from 1960 to 2000 increased by about 10 times, while the number of workers working on the site was reduced by 25%, and the production efficiency of construction was increased by 8 times. In Germany, there is an average of one dry mortar production plant for every 500,000 people, and there are currently about 100 dry mortar factories with a dry mortar output of 10 million t/ year. After 1990, dry mortar technology in Germany developed, and now this trend is continuing to develop in Eastern European countries.

The application of dry powder packing in Europe has been very common, Germany, Austria, Finland and other countries in a large number of dry powder mortar. In 2000, the output of dry mortar in Europe was about 35 to 40 million t/ year, and increased at an average annual growth rate of about 12%. The development of dry mortar in Southeast Asia is also very fast, with the rapid development of dry mortar market, dry mortar products in the Southeast Asian market are also rich, many new products, such as self-leveling mortar, fireproof mortar, color wall mortar and so on have been successfully put on the market. Singapore has built its first dry mortar production plant since 1984, and so far there are 5 plants with a output of more than 30t/h. Malaysia also put into operation a dry mortar production line in 1987 to produce coating mortar. In Korea, Japan, Thailand and many other Asian countries and regions, there are large-scale professional dry mortar production plants.

From the invention to the large-scale production of dry mixed mortar in Europe, it has experienced a course of more than 50 years; It has been 10 years since the introduction of dry mixed mortar to the initial production scale in China. At present, the annual output of dry mixed mortar in the world is nearly 100 million tons, and Europe produces about 50 million tons a year, of which Germany accounts for a quarter. China’s cement output is 40% of the world’s cement output, but the output of dry mixed mortar only accounts for 1% of the world’s output.

Dry mortar is currently in a period of rapid development in our country, although there are few large-scale professional dry mortar production enterprises, but with the continuous improvement of people’s living standards, the continuous development of housing privatization, homebuyers will have higher requirements for the quality of buildings, these factors will greatly promote the steady development of dry mortar. Like the promotion and development of commercial mortar, the development prospect of dry mortar in our country is also very promising.