[China Aluminum Industry Net] Foreword With the enhancement of environmental protection and energy saving requirements, many advanced energy-saving products and energy-saving technologies have gradually been used in China's construction industry. Energy-saving insulation issues are very important for buildings, because they are related to thousands of Ten thousand households are closely related to people's lives. Doors and windows occupy a crucial position in the house's energy-saving system.

As a key component of heat-insulating aluminum alloy doors and windows and curtain walls, the heat insulation strip also creates a brand-new product field with the application of heat-insulating aluminum alloy doors and windows and curtain walls. In short, the heat insulation aluminum alloy divides the original one-piece shape into two on the basis of the traditional aluminum alloy, and then the two heat insulation strips connect the two separate parts by means of mechanical composite means.

The use properties of the heat-insulation bar determine that it must have high strength and low conductivity at the same time. Otherwise, there is a significant quality risk in the heat-insulating aluminum alloy doors, windows and curtain walls. (Insufficient strength will cause the heat-insulating aluminum profile to be insulated from the heat-insulating bar. If the connection is broken, the thermal insulation effect is lost (high thermal conductivity can not guarantee the thermal insulation effect), so the material selection and manufacturing process of the thermal insulation bar are very critical.

First, how to flap 1, the appearance of natural scattered light, with normal vision (without using a magnifying glass), visual inspection at a distance of 0.5m. The appearance of the heat-insulating bar should be smooth, flat, uniform in color, and the surface should not have appearance defects that affect the use. Straight lines are not allowed to break. The number of breaks in the strip is no more than two.

2, cut off the experiment arbitrary sampling for human breaking test, nylon insulation bar bending can feel good toughness and strength, bent to the two ends together and will not be broken, even if the fracture was slowly broken; some nylon Insulation strips are either brittle or brittle. When bent to a certain distance between the two ends, multiple cracking phenomena occur, or the toughness is obvious, repeated bending repeatedly; PVC insulation strip is very soft, basically no strength, repeated bending will not Broken.

3, the dimensional accuracy.

Using the vernier caliper (more accurate micrometer) on the dimensional accuracy of thermal insulation strips can be found: Nylon thermal insulation strip regardless of the batch or the same thermal insulation strip in different parts of the size of the deviation is less than 0.1mm, and parallelism standards; Some nylon insulation bars or PVC insulation bars in different batches or the same thermal insulation strip at different parts of the size of the deviation of at least 0.1mm.

Second, the impact of substandard insulation on the production of 1, changes in the insulation after the water absorption and the effect of wear on the insulation section of the saturated absorption of water will have a more obvious impact on the return of the profile, due to the profile of the spray temperature reaches about At 200°C, the moisture inside the heat-insulation bar is hardly volatilized instantaneously. Therefore, when the heat-insulating bar is saturated and water-absorbed, it will bubble when returned to the spray, resulting in unqualified profiles. Therefore, the amount of water absorbed by the insulation bar is strictly controlled for the re-injection process.

Absorption is the inherent characteristic of nylon 66 insulation, so wear it as soon as possible after entering the warehouse, and make the first-in, first-out requirements. Excessive water content will affect the efficiency of the wear or aluminum extrusion Foaming phenomenon, it is recommended that the best temperature for the insulation strip is 20°C-30°C and humidity ≤55%. Due to the brittleness of nylon 66 in cold weather and dry conditions, it is recommended that the outer packaging of the product be properly opened 3 days before wearing. The product can absorb certain moisture, reduce brittleness, and improve toughness.

2. The relationship between the placement time and dimensional change of insulation bars The effect of water absorption on the dimensions of nylon 66 insulation products is still quite significant, although the dimensions of the insulation strips for open-toothed, rolled insulation profiles The impact of the change is not significant (just need to adjust the wear, rolling process parameters).

3. Insulation bar twisting often encounters twisting of the wire rod during production. The main problem is that the heat insulation bar is too tight during the completion of the bundling, and then the heat insulation bar is bundled during the transportation, resulting in the plastic wringing. The efficiency of employees in actual production has an impact, and it also brings trouble to production.

4. When the horizontal tensile strength affects the use in winter and summer, there is a large temperature difference between the two sections of the internal and external sections of the heat-insulated profile that forms the insulated aluminum window. This temperature difference will cause the two-cavity aluminum material inside and outside. There are different deformation trends. In summer, the temperature of the outer cavity profile is high, causing the outer arch to shrink. In winter, the temperature of the outer cavity profile is low, causing the inner arch to shrink outwards. This constant arching stress will cause the insulation profile to produce a larger horizontal pull in the middle. If the heat-insulating strip has low transverse tensile strength, cracking will occur, leading to quality problems in the heat-insulated section.

Third, the hazard of false nylon insulation strip If the mechanical strength of the insulation strip is not enough, it can not guarantee good wind pressure performance, directly affect the safety of the building; if the heat resistance is not good, it will directly affect the production of heat insulation aluminum profiles Some surface treatment processes in the process; chemical resistance not only affects the chemical treatment process during the process but also hinders the cleaning work during the subsequent use; if there is a large difference in linear expansion coefficient, poor creep resistance or dimensional stability Sexuality will lead to loosening of the deformation between the insulation strip and the aluminum alloy profile, reducing the airtightness of the energy-saving doors and windows, the sound insulation effect and the heat preservation property, and the like.

Fourth, high-quality insulation strip 1, high-quality insulation strip surface smooth insulation strips are black matte color, and the overall smooth and flat, no shrinkage, no loose, no scratches and mold extrusion marks, visible to the light look The mineral is uniquely glossy, and there is no parting line mark on the end face of the heat insulation strip;

2. The longitudinal tensile strength reflects the mechanical properties of the thermal insulation strip in the longitudinal direction. At the same time, the elastic modulus is one of the indexes that can better characterize the performance of the material. In engineering, the elastic modulus is called the stiffness of the material and it is characterized. The greater the value of the material's resistance to elastic deformation, the smaller the elastic deformation produced under the same stress and the more rigid the material.

3. When the product is subjected to dynamic load, the impact strength (toughness) performance index of the material is required. The level of impact strength also indicates the toughness of the material. It is one of the performance indicators of the material. Good toughness can ensure that the heat insulation strip is assembled. With a relatively high yield.

Conclusion In view of the current uneven heat insulation market in China, as a manufacturer of aluminum profiles, it is necessary to strictly control the quality of raw materials. The above outlines the identification method from the surface to the internal (appearance, dimensional accuracy, performance, etc.) to ensure that aluminum profiles Manufacturers produce stable quality and ensure the interests of customers.

References [1] GB/T23615.2-2012. "Aluminum alloy building profile auxiliary materials - Part 2: Polyurethane insulation material"

[2] GB5237.6-2012 "aluminum alloy building profiles national standards Part 6: heat insulation profiles"

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