When is the swimming circle invented? What is the material made?

1. When did the Swimming ring invented?

In the past, some people thought that the lifeblonga was introduced into China from Europe and the United States. In fact, the lifeburn circle was created and invented by our Chinese.

As early as two or three thousand years ago, my country had a "life -saving circle", which was the dry gourd.At that time, the clever Chinese people found that holding the dry gourd melon can float the body on the water and drown the gourd melon to become the most primitive life -saving equipment.Later, most of the vessels sailing at sea brought gourds to prevent unexpected.It can be seen that the ancient people of my country used the dry gourd to cross the river. This is the most primitive lifebuilding circle.

In the song Dynasty, the production method of the lifeburn was a step forward. Some people began to use soft wood, reeds, etc. to be prepared into a ring object, so that people can drill in and make the ring supporting people.The gourd melon is much more convenient, and it has become a veritable life -saving "circle".Han Shizhong, who was anti -Golden, who was anti -golden hero Yue Fei at the same time, sent Wang Quan to Jinshan to fight against the enemy. Before leaving, Han Shizhong ordered him not to use the boat to cross the river, so as not to be found by the enemy.So Wang Quan sent a circular floating ring made of cork to each soldier, allowing them to restrain the floating ring on the waist and cross the river.The soldiers quietly crossed the river under the leadership of the royal power.At that time, the floating ring used by the royal power was the predecessor of the modern lifebing circle.From the time to modern times, with the application of new technologies and new materials, various life -saving equipment appeared: lifeboats, life jackets, and uniform.But the traditional equipment of the lifebuilding circle is still retained by people, and it is still the easiest life -saving Tool.

2. What materials are the swimming rings made

The material of the inflatable Swimming ring is relatively single. Most of them are made of ordinary PVC materials. Most of the domestic PVC materials are the main in China. The 6P environmental PVC is better.

3. What material is the best material in the life circle

At present, the main forms of domestic Lifeline products include polystyrene packaging cloth life rings, polyurethane polyethylene composite lifebladder, and knot -type polyethylene lifebirth circle.

1. Polyetstics packaged cloth life ring

The polystyrene cloth life ring is mostly used in the inland rivers. The rim core material of the life ring is made of polystyrene material.Generally, the production process is to wrap glass fiber cloth in the rotary core material, and apply 3 layers of phenolic resin to form a sealed glass steel shell, and then wrap and apply several layers of paint.

2. Polyethylene compound lifebuilding circle

Polyethylene composite lifebrows are used as high -density polyethylene materials as shells. The internal rechargement of polyurethane foam materials is a new type of lifebuilding in China.At present, more than 100,000 annual output has reached more than 100.The composite life ring solves the problems of oil -resistant oil tolerance of polystyrene bales, in high temperature environments and long -term radiation in ultraviolet radiation, which is prone to aging, paint layer peeling, and complex manufacturing process.This type of lifebuilding has the advantages of solid color, Smooth surface, anti -aging, large mechanical strength, and corrosion resistance, but production costs are higher than that of polyethylene Bags.

3. Knotchye polyethylene foam life ring

The polyethylene lifebuilding circle is also known as the citrine polyethylene foam lifebuilding circle. It is made of low -density polyethylene foam. It is a new technology product. At present, only a few companies in China can produce.The circle of its products is only made of a single material of polyethylene. The circle body is full of elasticity. The surface is bright and beautiful on the surface. The strength, buoyancy, oil resistance and erosion resistance are not comparable.At present, the domestic product has high technology and high costs. The products produced only supply military or exports.