1、 Additions to physical regulations
1、 Additions to physical regulations
Physical and mechanical performance requirements
Added: impact absorption, vertical deformation, anti sliding value items and index requirements
Deleted: hardness (a), compression recovery rate, rebound value and performance requirements
Revised: tensile strength items and index requirements
Modified: elongation at break and index requirements
Noted: professional acrylic coating sports ground surface does not use the new national standard physical provisions
2、 The importance of physical and mechanical properties
Generally speaking, physical and mechanical properties are the main influence factors
It's the feeling of feet that we often talk about
A good sports ground gives people the feeling of sports
It's wonderful, it can help you to play well
It can also slow down the body loss in continuous training
In particular, the new national standard cancels the rebound value and compression recovery rate
New categories of vertical deformation and shock absorption are adopted
It can be found that the state has a great influence on the physical properties of sports flooring
Emphasis and emphasis
Compared with the old national standard hardness Shao (a) compression recovery rate
It is clearer, clearer and easier to measure
The advantages and disadvantages of the runway
In the new standard, the average thickness of track and field track is increased to more than 13mm (including 13mm)
The average thickness of ball games increased to more than 8 mm (including 8 mm)
on this basis
How to ensure that the vertical deformation value conforms to the new national standard at the same time
It can also meet the requirements of the new national standard for impact absorption
It's a test for the country to face all the sports land materials
According to our laboratory data
In traditional polyurethane track
When the impact absorptivity reaches 35% ~ 50% under 13mm
The vertical deformation value is 3.0 ~ 4.5mm
It does not meet the requirements of the new national standard
Too soft, that is, high impact absorption
It is bound to lead to the soft foot feeling of the runway and affect the movement force
The vertical deformation is small
The impact absorptivity will decrease
The track feet feel hard, and it is easy to be injured in intense sports
It can be found that they influence and promote each other
How to meet the physical requirements of the new national standard
In order to meet the requirements of the new national standard for the physical properties of sports flooring
1、 We should start from the raw materials, and choose higher polymer content
Granular products with better impact absorption
2、 It is necessary to start with the structure and improve the runway structure
Optimize buffer layer to improve surface performance
For example, adding a strong and tough reinforcing layer or
Use new glue, etc
Determination of physical properties
1、 Determination of shock absorption
The above calculation method is consistent with previous standards
The difference is small
But we can find that in the following passage
The new national standard has been added
Shock absorption test at high and low temperature
This is a major difference from the previous standards
The new national standard requires
（0 ± 2） ℃、（23 ± 2） ℃、（50 ± 2） ℃
Test under three temperature conditions
The specific wording is as follows:
二、垂直变形率的测定
——To be continued——
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