Recently, the reporter walked into the plastic product quality supervision and inspection station (Yutian) of Hebei Province and followed the inspection process of plastic products. The staff members showed the reporter the testing procedures for beverage bottles.
Enter the quality inspection station, wide and clean sample collection hall straight into the eyes. The staff here will sample and submit the product number, record, classification, and fill out the items to be tested, in order to prepare laboratory colleagues for accurate targeted testing.
In normal tests, the vials and caps were tested separately. The staff first performed a visual inspection of the bottle cap to observe its specification deviation. The end face of the cap of the qualified product should be smooth, the thread should be smooth and smooth without any damage, and the flash flash should not exceed 3mm. In addition to appearance, the most important test item for the bottle cap is the “opening torque of anti-theft cap†test. This sounds a squeaky name designed to help consumers check if the bottle cap is for secondary use. For example, in order to gain more benefits, some manufacturers will reuse bottle caps, and the connection parts of the bottle caps and the bottle mouth are easily overlooked by consumers, but it will have a certain impact on the user's personal health.
The next step is to test the sample vial. First of all, it is also a visual inspection, beverage bottle body should be full, uniform color, no bubbles, raw materials, cold spots, stains and haze white phenomenon; and the bottom of the bottle requires the injection port does not exceed the bottom plane. Then, using the scale and standard volumetric flask to measure whether the height and capacity are consistent with the data provided by the company.
Entering a testing room with both large and small testing equipment, the reporter learned that this place is where physical properties such as stretching, tearing, compression, and impact resistance of plastic products are tested. In all testing equipment, the one with the tallest one immediately attracted the interest of reporters. The staff member told the reporter with a smile and said, "Don't worry anymore. There are still two inspection tasks that need to be completed before this" - sealing performance and vertical pressure. Since beverages are something consumers carry around, it can be devastating if beverage bottles are spilled. Therefore, the staff needs to fill 5 same sample bottles with water, tighten the lid, place the sample on a flat surface, and wait for 8 hours to inspect for leaks.
On the right side of the experiment table, there is a computer servo universal testing machine, which is the instrument for testing the vertical pressure-carrying performance of the sample beverage bottle. The staff explained that during the transportation and placement process, beverages are often placed in a stack. In this state, the beverage bottle must have a certain pressure capacity. The reporter saw that the instrument slowly pressed down the sample bottle at a constant speed until the bottle began to deform. The pressure was stopped and the first maximum load was detected. The result was ≥100 cows.
Immediately afterwards, the staff members came to the "tallest" equipment for test preparation. In order to allow reporters to see the process, a bottle of colored carbonated beverage sample bottles was specifically presented for demonstration. This instrument is also suitable for other plastic products such as plastic baskets. After the sample beverage bottle was filled with water and the lid was well covered, as the instrument was gradually raised to a position of 1.5 meters, the bottle mouth was clamped upwards. Suddenly, the bottle lock was opened and the vial was allowed to “freeze†freely. To the ground. The reporter was told that in the ordinary life, people will inevitably drop the beverage. This test is used to test the drop ability of the drink bottle. If the drop results in no break, it will be considered qualified.
“You must be familiar with this test item.†The staff member said that the band was walking into another lab and once he entered the house, he opened the freezer door. That's right, during hot summer months, everyone has the time when they can't stand the heat to buy iced drinks. In the case of ice bottles, can beverage bottles keep their shape unchanged and the liquid does not leak outside? This process is to test the cold resistance of the vial. The staff put the filled water bottle in a freezer at -20°C. After 8 hours, the bottle was inspected for changes.
After the physical property testing was completed, the staff took the reporter to the chemical property testing room on the second floor of the quality inspection station. The reporter observed that on the walls of the corridor and on the side of the stairs, there were many self-made aphorisms. The sentences explained the quality inspection work under the purpose of “scientific, fair, honest, and efficientâ€. The place reflects that Yutian quality inspectors are always reminding and clarifying their responsibilities.
Standing on the second floor of the corridor, the large, transparent glass gives an unobstructed view of the laboratory's work. The red exhaust outlets with laboratory symbolic signs are lined up one after the other and several staff members are busy working intensively. Here, the vials should first be cut, cut, and soaked with reagents for sample preparation. Beverage bottles are inextricably linked to our lives. Because they are often in close contact with the human body, its health and safety have a direct impact on physical health. In the end, whether or not the plastic bottle contains toxic and hazardous substances is well known. After sample preparation, observe whether the sample is smooth and transparent, with or without bubbles, and whether the appearance is whitish, impurities, stains, etc.; while observing the soaking solution, the colorless, tasteless, and odorless are qualified.
Then, the workers weighed, dried, and then weighed the sample. Using its evaporation residue, it was checked whether the impurities contained in the sample bottle exceeded the standard. By immersing the sample in the potassium permanganate solution within the specified value, the consumption of potassium permanganate is determined to determine whether it contains harmful substances; then the same method is used to soak in the acetic acid standard solution to check whether the heavy metal content is qualified. At this point, the testing procedure for a beverage bottle is basically completed. In this process, the staff will record the test results one by one, faithfully, on the test report, and then analyze, determine, and finally issue an authoritative test report.
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