PET Bottle and Cap Quality Testing
PET bottles, made from the versatile plastic material polyethylene terephthalate (PET), boast properties such as light weight, high transparency, and impressive impact resistance. This article delves into the quality testing of PET bottles, exploring crucial factors such as verticality, wall thickness, compression, cap opening, and sealing performance.
Introduction
PET plastic has the characteristics of light weight, high transparency, impact resistance and not easy to break. It can also block carbon dioxide gas and keep soda water “gas”. PET bottles have strong applicability and are widely used in daily necessities, daily chemical packaging and other fields.
PET bottles are reprocessed by blow molding to form plastic bottles, including bottles for cosmetics, medicine, health care, beverages, mineral water, reagents, etc. A method of blow molding to form PET plastic bottles.
Quality inspection of PET bottles
The routine testing of PET bottles includes verticality, bottle wall thickness testing, compression testing, cap opening, sealing and other testing items.
Perpendicularity Testing
According to the ISO 9008.
Vertical Load Testing
Place five sampling bottles at 23±2°C for more than 2 hours, apply vertical pressure on the sample bottles at a constant speed of 100mm/min on the testing machine, record the maximum load of each sample for the first time, and take the arithmetic mean value.
Drop Performance Testing
Fill 5 sampling bottles with water at 20±5°C according to the nominal capacity, cover them well, and conduct a drop test on the concrete floor. The drop height is 1.8m, the bottle mouth is upward, and it falls freely.
Summary of Bottle Cap Test Items
The comprehensive bottle cap testing involves various parameters to ensure a secure seal. Using a capping machine, both non-carbonated and carbonated caps are sealed according to specific torque requirements. Subsequent tests include pressurization, underwater observation for air leakage, and assessment of cap stability.
Sealing Performance Test
Use a capping machine to seal the non-carbonated cap according to the rated torque that meets the requirements, test it with a seal tester, pressurize to 200kPa, keep the pressure under water for 1min, observe whether there is air leakage, then increase the pressure to 350kPa, and keep the pressure for 1min , observe whether the bottle cap is loose and pops up.
Use the capping machine to seal the carbonic acid cap according to the rated torque that meets the capping requirements, cut off the anti-theft ring, test with a seal tester, pressurize to 690kPa, keep the pressure under water for 1min, observe whether there is air leakage, and then increase the pressure to 1207kPa, keep the pressure for 1min, and observe whether the bottle cap pops out.
Drop performance
After injecting the nominal volume of water into the bottle, use a capping machine to seal the non-carbonated cap according to the rated torque that meets the capping requirements, and test according to the following requirements to observe whether the cap is flying off and whether the seal is leaking.
In this post on PET bottle quality testing, we’ve explored the importance of verticality, load capacity, drop performance, and sealing capabilities. Whether used in packaging, food, medicine, or other industries, these quality tests ensure the reliability of PET bottles. As you seek top-tier PET bottle quality control tools for your products, trust in our commitment to quality and reliability.