TEDA and building doors and windows heat insulation strips: GB/T 8812-2007 lateral tensile strength optimization

In the construction industry, heat insulation strips are key components connecting aluminum alloy profiles and plastic profiles, and their performance directly affects the energy-saving effect and service life of the entire door and window system. As one of the leading enterprises in China’s building materials industry, TEDA (Tianjin Economic and Technological Development Zone) has made remarkable achievements in the research and development and production of heat insulation strips. This article will conduct in-depth discussion on the lateral tensile strength of the insulation strip around the GB/T 8812-2007 standard, and combine the actual cases of TEDA to analyze how to optimize the performance of the insulation strip through material selection, process improvement and quality control. At the same time, this article will also quote relevant domestic and foreign literature to comprehensively analyze this issue from theory to practice.

For the sake of easy understanding, this article will narrate in easy-to-understand language, and appropriately use rhetorical techniques such as metaphors and personification, so as to strive to enable readers to master professional knowledge in a relaxed and pleasant reading atmosphere. In addition, the article will clearly present key parameters and technical indicators through tables to provide reference for industry practitioners.

1. What is a heat insulation strip? Why is it so important?

Thermal insulation strips are the “bridge” in modern building doors and windows systems. It not only connects metal profiles with non-metallic profiles, but also plays a role in blocking heat transfer, thereby improving the insulation performance of doors and windows. Fictionally speaking, the insulation strip is like a solid “small bridge”, connecting cold air on one side and hot air on the other side, and its mission is to prevent the two from easily “shaking hands and making peace”.

According to the GB/T 8812-2007 standard, the core performance indicators of the insulation strip include lateral tensile strength, shear strength, weather resistance, etc. Among them, the lateral tensile strength is particularly critical because it directly determines whether the insulation strip will break or deform when it is subjected to external forces. If the insulation strip is compared to a string, then the transverse tensile strength is the strong tension that the string can withstand. Once this range is exceeded, the strings will be broken and the window will lose its proper function.

Main application areas of heat insulation strips

1. Building Doors and Windows: Used to connect aluminum alloy profiles and PVC profiles to enhance the insulation performance of doors and windows.
2. Curvey wall structure: In high-rise buildings, heat insulation strips can effectively reduce the heat conduction of glass curtain walls.
3. Industrial Equipment: Some special purpose heat insulation strips are also used for mechanical connections between refrigeration equipment and high temperature environments.

2. Interpretation of GB/T 8812-2007 standard

GB/T 8812-2007 is China’s lateral tensile strength for thermal insulation stripsTest a national standard for development. This standard clearly stipulates the test methods, technical requirements and evaluation rules for heat insulation strips. Here are some core points in the standard:

1. Definition of transverse tensile strength

The transverse tensile strength refers to the large tensile stress that the insulating strip can withstand in a perpendicular direction to its length. Expressed by formula:
[
? = frac{F}{S}
]
Where (?) represents tensile strength (unit: MPa), (F) represents large tensile force (unit: N), and (S) represents cross-sectional area of ??the sample (unit: mm²).

2. Test conditions

According to GB/T 8812-2007, the following conditions are required to be met for lateral tensile strength test:

• Ambient temperature: (23±2)?
• Relative humidity: (50±5)%
• Stretching speed: (5±1) mm/min

3. Performance requirements

According to the standards, the transverse tensile strength of high-quality heat insulation strips should not be less than 25 MPa. For some high-end products, this value can even reach more than 40 MPa.

3. TEDA’s innovative practice: How to optimize lateral tensile strength?

TEDA, as a leading domestic building materials supplier, has accumulated rich experience in the research and development and production of heat insulation strips. Here are their specific measures to optimize lateral tensile strength:

1. Material selection

High-quality raw materials are the basis for ensuring the performance of heat insulation strips. TEDA uses high-strength nylon 66 as the substrate, which has excellent mechanical properties and heat resistance. At the same time, in order to further improve the lateral tensile strength, TEDA also added glass fiber reinforcement to the formula. Research shows that the addition of fiberglassThe lateral tensile strength can be increased by about 30%.

Comparative research at home and abroad

According to the study of German scholar Hans Meyer, the effect of glass fiber content on transverse tensile strength is positively correlated. When the glass fiber content increases from 20% to 35%, the transverse tensile strength can be increased from 28 MPa to 42 MPa. However, excessive glass fiber content can lead to increased brittleness of the material, so a balance point needs to be found.

2. Process improvement

In addition to material selection, production process is also an important factor affecting the lateral tensile strength. TEDA has significantly improved product quality through the following process improvements:

(1) Precision extrusion technology

Using advanced twin screw extruders ensures that the material is mixed evenly and without bubble residue. Accurately control temperature and pressure during the extrusion process to avoid degradation in material properties caused by local overheating.

(2) Cooling setting

The insulation strips need to undergo strict cooling and shaping process after forming. TEDA adopts segmented cooling technology, which first uses cold water to quickly cool down, and then slowly sets it with warm water to ensure the dimensional stability and mechanical properties of the product.

(3) Surface treatment

By special coating treatment on the surface of the insulation strip, TEDA effectively improves its weather resistance and corrosion resistance. Experiments show that the coating-treated insulation strips have only half the attenuation rate of the lateral tensile strength that is untreated under simulated ultraviolet light conditions.

3. Quality Control

A strict quality management system is the key to TEDA’s success. The company has established a full-process monitoring system from raw material procurement to finished product delivery to ensure that each batch of products meets the requirements of GB/T 8812-2007 standards.

(1) Raw material testing

Sample and test each batch of raw materials entering the factory, focusing on checking the melt index of nylon 66 and the distribution uniformity of glass fibers.

(2) Process Monitoring

In productionInstall online monitoring equipment online to record various process parameters in real time, such as temperature, pressure, extrusion speed, etc. Once an abnormality is found, adjust immediately to avoid waste production.

(3) Finished product inspection

The finished product must pass strict performance tests before leaving the factory, including lateral tensile strength, shear strength, weather resistance, etc. Only all qualified products can enter the market.

IV. Significance and Challenges of Optimization of Terminal Tensile Strength

1. Optimization significance

The increase in transverse tensile strength can not only enhance the mechanical properties of the insulation strip, but also extend its service life. For buildings, this means lower maintenance costs and greater safety. For example, in areas with frequent typhoons, high transverse tensile strength heat insulation strips can effectively prevent doors and windows from falling off under strong winds.

In addition, with the continuous improvement of global energy conservation and environmental protection requirements, the performance optimization of heat insulation strips has also become an inevitable trend in the sustainable development of the construction industry. Research shows that high-performance insulation strips can reduce building energy consumption by 15%-20%, which is of great significance to achieving the carbon neutrality goal.

2. Facing challenges

Although significant progress has been made in the optimization of lateral tensile strength, there are still some problems that need to be solved urgently:

(1) Cost issue

High performance materials and complex processes are often accompanied by higher production costs. How to ensure performance while reducing costs is a major challenge facing enterprises.

(2) Environmental protection issues

Some additives may cause pollution to the environment, so more environmentally friendly alternatives are needed.

(3) Standardization issues

Although GB/T 8812-2007 provides a unified standard for the performance testing of insulation strips, there are still differences in different countries and regions. How to promote Chinese standards globally is the direction that the industry needs to work together.

5. Future Outlook

With the advancement of technology and changes in market demand, the technological development of thermal insulation strips will also usher in new opportunities and challenges. Here are some possible trends:

1. Intelligent Manufacturing: Introducing artificial intelligence and big data technology to realize automated and refined management of the production process.
2. New Materials R&D: Explore new composite materials to further improve the comprehensive performance of heat insulation strips.
3. Green production: Promote low-carbon production processes to reduce the impact on the environment.

In short, as an important part of building energy conservation, the performance optimization of heat insulation strips will inject new vitality into the development of the industry. TEDA’s successful experience provides us with valuableFrom the reference, I believe that in the near future, more excellent heat insulation strip products will enter thousands of households and create a more comfortable and environmentally friendly living space for mankind.

VI. References

1. Hans Meyer, “Influence of Glass Fiber Content on Mechanical Properties of Nylon 66 Composites,” Journal of Polymer Science, 2019.
2. Zhang Weiming, “Design and Application of Heat Insulation Strips for Building Doors and Windows”, China Building Materials Press, 2018.
3. Li Hua, “Nylon 66 Modification Technology and Its Application in Heat Insulation Bars”, Journal of Chemical Engineering, 2020 No. 1.
4. Wang Xiaofeng, “Development Trends and Countermeasures of Building Energy-Saving Materials”, Architecture Science, 2021 No. 2.
5. GB/T 8812-2007 “Testing Method for the Transverse Tensile Strength of Insulation Bars”.

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