Security doors are used in many industries. In factories, at the airport, courts are common, and even schools are no exception. There are many students in the school and safety is very important. During school hours, when there are many people waiting for school hours, the school will step up security patrols. This is not enough. Some schools set up security doors at the gates to prevent dangerous items such as murderers from entering the school.
At the gates of the campus, these important places will not be used to conduct personal searches on incoming and outgoing personnel. This practice is not practical, but it will disrupt the psychology of student learning and it is also a manifestation of human rights violations. However, if you have been using high technology such as security gates, you can detect hazardous objects such as dangerous goods, so it is necessary to install security doors in schools.
The location of the school security gate, it is best to choose the entrance, and the entrance of the channel, in the scope of the installation, it is best not to have large metal objects, or will cause other trouble. Install security doors on campus, its sensitivity can be adjusted according to the actual situation, so that we can achieve a good alarm effect. After installing the security gates, students should be prevented from being overcrowded at the passage point. It is recommended that you choose a wider security door so that the supervision efficiency will be higher.
Calcium Carbonate
According to the different production methods of calcium carbonate, calcium carbonate can be divided into Heavy Calcium Carbonate, light calcium carbonate, colloidal calcium carbonate and crystalline calcium carbonate. White solid, tasteless and odorless. There are two forms of amorphous and crystalline. The crystal type can be divided into orthorhombic crystal system and hexagonal crystal system, which are columnar or diamond-shaped.
Calcium carbonate is widely used in filling polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), acrylonitrile butadiene-styrene copolymer (ABS) and other resins. The addition of calcium carbonate has a certain effect on improving certain properties of plastic products and expanding their application range. In plastic processing, they can reduce resin shrinkage, improve rheology, and control viscosity. It can also play the following roles:
(1) Improve the dimensional stability of plastic products;
(2) Improve the hardness and rigidity of plastic products;
(3) Improve plastic processing performance;
(4) Improve the heat resistance of plastic products;
(5) Improve the astigmatism of plastics;
(6) It can make the product have some special properties;
(7) Reduce the cost of plastic products.
Calcium Carbonate,Calcium Carbonate, Light Calcium Carbonate
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