Expert interpretation of product quality: plastic doors and windows

Product Introduction Plastic door and window refers to unplasticized polyvinyl chloride resin as the main raw material, adding stabilizers, modifiers, fillers, through the mechanical mixing, plasticization, extrusion molding into a variety of profiles with different profiles as the door and window rod Pieces, according to the design size cutting profiles, into enhanced steel, welding, fitted with hardware, sealed tops, strips, glass, etc. become plastic doors and windows.

Key indicators 1. Wind pressure performance. When the doors and windows are normally closed, no damage (such as cracking, panel damage, local yielding, etc.) and functional obstacles such as loosening of the hardware and difficulties in opening can occur without the effect of wind pressure.

The national standard GBT7106-2008 “Airtightness, watertightness, wind pressure resistance performance grading and detection method for buildings with external doors and windows” sets the wind pressure resistance rating of the building's exterior doors and windows to 1 to 9. By placing reinforced steels of different sizes and shapes in the profiles, the plastic doors and windows can obtain different wind pressure levels.

2. Hermetic performance. The ability to block air penetration when the doors and windows are normally closed. The air permeability per unit area (m3/m2·h) and air permeability per unit opening seam length (m3/m·h) indicate that GBT7106-2008 classifies it into 1 to 8 grades.

3. Watertight performance. In the normal closed state of doors and windows, under the action of wind and rain at the same time, prevent the ability of rainwater leakage. GBT7106-2008 will be divided into 1 to 6 levels. The structure of doors and windows, assembly quality, and fit clearance directly affect the airtight performance and watertight performance of doors and windows.

4. Main profile quality. The main profile is the main component of the plastic door and window, whose quality directly affects the quality of plastic doors and windows. According to GB/T8814-2004 "Unplasticized Polyvinyl Chloride (PVC-U) Profiles for Doors and Windows", the key performance indicators of the main profile are: dimensional change rate after heating (dimension changes will cause stress in the interior of doors and windows, leading to local Destruction), drop impact of the main profile, aging properties (color change and performance degradation after aging), weldability of the main profile (affecting the destructive force of the welding angle).

5. Welding angle destructive power. The destructive power of welding angle is an important indicator for assessing the firmness of doors and windows. The reasons that affect the destructive power of welding angle are on the one hand the weldability of the main profile (related to the production of the main profile material, formulation and production control), and on the other hand the control of the welding process parameters (temperature, pressure, time, accuracy Positioning).

6. For energy-saving plastic doors and windows, there are several key indicators. One is the insulation performance; the second is the glass shading coefficient; the third is the visible light transmittance of the glass; and the fourth is the dew point of the hollow glass.

Buying Tips Different from other products, plastic doors and windows are not directly purchased in the market or manufacturers, but are customized according to actual conditions. The following factors must be considered when customizing:

1. According to the size of the building, choose doors and windows to customize the manufacturer. Custom manufacturers must have minimum configuration for producing plastic doors and windows (more than three automatic welding machines, double-head cutting machines, V-saws, clearing machines, sink milling, and glass bead saws). It is based on advanced assembly equipment.

2. When determining key performance indicators such as wind pressure resistance, air tightness, and water tightness of doors and windows, factors such as the importance of the building, the basic wind pressure in the area, the surrounding environment, and the height should be considered. Do not blindly pursue high targets. Excess quality is also a waste.

3. The quality of doors and windows depends on the advantages and disadvantages of the selected raw materials, hardware, seal tops, glue strips, glass and other major raw and auxiliary materials. It should be selected according to the grade of doors and windows when customizing.

4. Simple test method for the quality of materials used for doors and windows: Main profile: Uniform color; Visible surface wall thickness: Casement window: ≥2.5mm, Sliding window: ≥2.2mm, Swing door: ≥2.8mm, Sliding door: ≥2.5mm; The flat surface of the file was not broken; there was no change in soaking with dichloromethane for two hours. Reinforced steel: galvanized anti-corrosion treatment should be used, thickness: plastic window ≥ 1.5mm, plastic door: ≥ 2.0mm. Glass: no impurities, bubbles, flatness, see through the glass is not deformed. Sealing tops: The hairs are of the same height, tightly and elastically, and the floorboards have strength. The bubbles are taken out in the water and there are small drops of water attached to the hands. After drying, the hairs are not wetted. Sealant strip: The surface is smooth, the edge is neat and elastic, the hand pulls continuously, and after loosening, it basically restores the original shape.