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How to distinguish whether the insulation strip is nylon or PVC

How to distinguish whether the insulation strip is nylon or PVC

  • Categories:新聞中心
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  • Time of issue:2019-01-01 00:00
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(Summary description)

How to distinguish whether the insulation strip is nylon or PVC

(Summary description)

  • Categories:新聞中心
  • Author:
  • Origin:
  • Time of issue:2019-01-01 00:00
  • Views:
Information

 

Broken bridge aluminum heat insulation strips are the top priority of broken bridge aluminum doors and windows, and play a vital role in the quality of broken bridge aluminum doors and windows. Good broken bridge aluminum doors and windows use PA66 nylon strips, while inferior broken bridges Aluminum doors and windows use PVC insulation strips, so how do you distinguish between these two kinds of insulation strips?

1. Looking at the gloss, the surface of the nylon strip PA66 of the broken bridge aluminum window is a frosted texture, and the color is anti-black; but the PVC strip looks very smooth, smooth, and the color is anti-white. The two can be clearly distinguished by comparing them together.

2. Another point is that the nylon strip PA66 is combustible, and the PVC strip is indistinguishable from the fire. As long as you carefully observe it, you will be able to distinguish the nylon strip and the PVC strip.

Simple detection method:

The product in your hand has passed the factory inspection of the Quality Department, which includes six inspections of density, Shore hardness, transverse tensile strength, glass fiber content, and product appearance size.

1. The first step is to burn to determine the composition

It is self-extinguishing from the fire, and the pungent odor is PVC; after the combustion is extinguished, the scorched protein is nylon.

2. The second step of visual inspection: observe the surface

Unqualified heat insulation strip: floating fiber on the surface, not smooth;

Qualified heat insulation strip: bright surface, uniform color and no white spots;

3. The third step measurement: measure the size

The dimensional accuracy of the aluminum thermal insulation strip of the broken bridge not only affects the composite quality of the profile, but also has an essential impact on the water tightness, air tightness, and wind pressure resistance of insulated doors and windows;

Qualified heat insulation strips are accurate in size and beautiful in appearance; unqualified heat insulation strips are inaccurate in outline size;

4. The fourth step of weighing: measuring density

The internal structure of a good heat insulation strip is compact, with a density of 1.30±0.05. Under normal conditions, we can simply determine the density of the insulation strip by weighing the weight of the insulation strip per meter. Taking I14.8 as an example, a good insulation strip weighs about 45g per meter.

5. The fifth step of hand breaking: judge the internal structure of the section

The internal structural quality of the aluminum thermal insulation strip of the broken bridge is the principle guarantee for the strength and stability of the thermal insulation profile.

Unqualified broken bridge aluminum heat insulation strip: The internal structure is loose, the content of glass fiber is small, or even there is no glass fiber, and it contains a lot of pores, which seriously affects the strength of the heat insulation strip;

Qualified heat insulation strip: the internal structure is tight, and there is no air hole, the glass fiber is arranged irregularly and distributed evenly;

6. The sixth step of transverse stretch: test strength

Generally speaking, every large material factory has such simple machines and fixtures to carry out this test.

The lateral tensile characteristic value is the specific value of the strength of the barrier strip.

The transverse tensile characteristic value of the national standard heat insulation strip is ≥70MPa.

caution:

1. The glass fiber reinforced nylon 66 composite material is a brittle material. While increasing the tensile strength of the glass fiber reinforced nylon 66 insulation strip, it will also cause the impact resistance of the insulation strip to decrease, that is to say, the brittleness increases, which is very easy to appear. Therefore, users must comprehensively consider various indicators when choosing heat insulation strips, and cannot blindly pursue high tensile strength.

2. "Easy to absorb water" is the fundamental characteristic of nylon 66. During the storage process, the moisture in the air will gradually diffuse into the interior through the surface of the heat insulation strip, and some will form crystal water on the nylon 66 molecular chain, and some will be free between the molecular chains, reducing the interaction between the nylon 66 molecular chains. To reduce the tensile strength, too high water content will also affect the effect of the strip or may produce bubbles during the spraying process, so it is recommended to store at 15-24 ℃.

 

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