Quality Control
Raw Material Testing
To ensure the safety and quality of raw materials, we have implemented a testing process covering four key links: supplier evaluation, material specification development, incoming inspection, and traceability and document management, to ensure that raw materials meet safety standards and can be fully traced during the production process.
Supplier Evaluation
When selecting raw materials suppliers, WINIW will first check the supplier's business license, production license, and quality management system certification documentation. Then evaluate the supplier's production scale, equipment and facilities, and technical level to understand whether the supplier has the ability to stabilize the raw materials required for stable supply.
01
Material Specifications
Before production, we prepare a detailed ingredient specification sheet for each raw material type. The specification sheet details the chemical composition, physical properties and safety standards of the raw materials to ensure that the raw materials meet international safety requirements before going into production.
02
Incoming inspection
-Appearance inspection. Check whether the raw materials have damage, stains, deformation and other problems, and quickly screen out problematic raw materials.
-Laboratory analysis. Use professional instruments and equipment to accurately analyze the chemical composition of raw materials, so as to detect whether the content of various components in the raw materials is within the specified range.
-Safety assessment of harmful substances (such as heavy metals or phthalates). Focus on whether the raw materials contain heavy metals (such as lead, mercury, cadmium, etc.) or harmful substances such as phthalates.
03
Traceability and Recordkeeping
When purchasing raw materials, we keep detailed records of all raw materials, including production records, inspection reports, shipping documents and other documents provided by suppliers. We then establish our own raw material traceability system to register and manage each batch of raw materials so that we can quickly trace the source of the raw materials when quality problems arise.
04
Quality Inspection in Production Process
During the production process, we strictly monitor the key parameters during production and conduct product quality inspections at each stage using random sampling to ensure that the quality of the products produced meets the standards.
Process monitoring:
During the production process, we will strictly monitor the key parameters of synthetic leather such as temperature range, pressure, and humidity to ensure the quality of synthetic leather. Generally speaking, during the production process, the temperature is usually controlled between 150℃ and 200℃ to ensure that the physical properties and appearance quality of synthetic leather are in the best state. The pressure is usually set at around 2 MPa to 5 MPa to ensure that the surface of the synthetic leather is smoother and the texture is clearer. The humidity percentage is generally controlled between 40% and 60% to prevent the synthetic leather from drying too fast or too slow during the production process.
Manufacturing process inspection:
In the production process of synthetic leather, our quality control personnel will check whether the proportion of each raw material is accurate during the raw material preparation stage to ensure that the mixing uniformity of the raw materials meets the standard requirements. During the finished product coating stage, they will use thickness gauges, colorimeter and other equipment to check whether the coating of the synthetic leather is uniform, the thickness and the color are consistent. During the curing stage, the quality control personnel will test the adhesion of the synthetic leather by sampling to ensure that it meets the actual use requirements. At the same time, they will also check whether there are defects such as bubbles and cracks in the cured synthetic leather to ensure the quality of the product.
Sampling technology:
During the production process of synthetic leather, our quality control personnel will use sampling technology to check the quality of raw materials and products after production. For raw materials, our quality control personnel will sample and test whether their physical properties, chemical composition and other indicators meet the requirements. For products, our quality control personnel will check whether the texture of the synthetic leather is uniform, whether the color is consistent, whether there are any defects, etc. At the same time, the wear resistance, folding resistance, tensile strength, etc. of the products will also be tested.
Finished Product Quality Inspection Steps
Finished product quality inspection
1. Visual inspection
- First, check the overall appearance of the product. Carefully check whether the color of the synthetic leather surface is uniform and consistent, and whether there are obvious color spots, color differences or unnatural color transitions.
- Second, check whether the texture pattern is clear and discernible. The texture pattern should have high clarity and should not have blurred or unclear parts.
- Finally, check for signs of wear or production defects. This includes checking the surface of the synthetic leather for scratches, wear and damage, etc., as well as production defects such as blistering, delamination and degumming.
2. Tactile inspection
-First, examine the tactile quality of artificial leather. Touch the surface of the synthetic leather with your hands to feel whether it is smooth. At the same time, observe whether the synthetic leather can quickly recover to its original shape after stretching or bending.
-Next, examine the flexibility and softness of the material. According to standard methods such as GB/T 39371-2020 "Determination of Leather Softness", the leather is measured from the grain and flesh directions. The synthetic leather is placed on a specific test device, a certain pressure and bending angle are applied, and its deformation and recovery ability are observed.
3. Size inspection
-First, the length, width and height of the product need to be accurately measured. Our staff will use precise measuring tools such as tape measures and calipers to carefully measure the synthetic leather to ensure that the product size meets market standards.
-Secondly, carefully check the stitching size of the synthetic leather. The staff will observe whether the stitching length meets industry requirements, and at the same time, evaluate whether the density and strength of the stitching are appropriate. They will gently pull the stitching to check whether it is firm and check for any loose threads or cracks.
Quality Inspection Equipment
When testing the properties of synthetic leather, we use the following instruments to ensure that products meet industry standards and customer requirements.
TABER Abrasion Tester
Our TABER Abrasion Tester supports dual-axis calibration compensation, which can control the dispensing volume extremely accurately, and the error can be controlled within the range of ±0.02mm. Through the multi-axis motion system, the dispensing path can be accurately controlled and planned to ensure the accuracy and consistency of dispensing. In addition, it can match high UPH (output per hour), and while running efficiently, it can also realize the automatic cleaning function of the nozzle, effectively reducing manual intervention and improving the efficiency and stability of the equipment.
Normal Temperature Folding Tester
Our normal temperature folding test machine has a dual-station multi-axis intelligent working platform, which can perform multiple operations at the same time, greatly improving work efficiency. The synchronous CCD precision positioning system can ensure high-precision positioning during the test process, ensuring the accuracy and reliability of the test results.
Weathering Tester
Weathering test machine plays a key role in the quality inspection of artificial leather. During the test, the staff needs to regularly and carefully observe the appearance changes of the sample. First, check whether there are any color changes, including darkening or lightening, the appearance of mottled colors, and observe whether the color of the artificial leather has lost its original brightness. At the same time, pay attention to whether there are cracks on the surface of the sample. In addition, it is necessary to check whether there is any strength loss. The strength change of artificial leather can be evaluated by simple tensile or bending tests. By observing these appearance changes, the ability of artificial leather to resist degradation caused by environmental factors such as humidity, temperature fluctuations, and ultraviolet radiation can be evaluated.
Anti-Ultraviolet Testing Machine
The anti-ultraviolet testing machine plays an important role in evaluating the performance of artificial leather. The testing machine tests artificial leather samples by simulating ultraviolet radiation in the natural environment. During the test, the anti-ultraviolet testing machine records the maximum force value, elongation at break and other data of the sample when stretched or torn. The staff can comprehensively analyze these data to evaluate the tolerance of artificial leather under ultraviolet radiation.
Tear Strength Testing Machine
Tear strength tester can accurately measure the tear strength and tensile properties of synthetic leather, thus providing reliable data support for evaluating the quality and performance of synthetic leather. Since different types of synthetic leather may have different standard requirements, it is necessary to refer to the corresponding product standards or industry specifications to determine the test results during actual testing. These standards and specifications usually clearly specify the test methods, conditions, parameters, etc., in order to ensure the accuracy and comparability of the test results.
Low Temperature Folding Test Machine
The low temperature folding test machine is mainly used to test the folding resistance of synthetic leather in low temperature environment. During the test, it is necessary to regularly observe the operating status of the test machine and the changes in the sample. Specifically, check whether the temperature remains stable to ensure that the test environment meets the requirements; check whether the counter counts normally to accurately record the test data; at the same time, pay attention to whether the sample has any abnormal conditions, such as whether the sample has cracks, breaks, delamination, etc. during the bending process.
Breathable And Waterproof Testing Machine
The breathable and waterproof tester accurately measures the breathable and waterproof performance of synthetic leather by real-time monitoring and recording the gas flow, pressure changes or liquid penetration on the sample surface.
During the test, the synthetic leather sample is placed in a specific test area of the tester, and the tester starts working, applying a certain pressure to the sample or simulating the conditions in the actual use environment. Through high-precision sensors, the flow of gas on the sample surface and the change of pressure are monitored in real time.