What items are typically inspected for cooking oil barrels? (Part 1)

Xiaomin on Inspection: The purpose is to evaluate the sample by examining its physical appearance—ensuring the bottle opening has a smooth, flat end face, the threads are neatly rounded with no chipping or defects, and there’s no obvious excess material or burring. Additionally, the bottle body should be perfectly molded, free of bubbles, impurities, or deformations, with uniform coloration. The bottle must stand steadily without any noticeable tilt, and the浇口 at the bottom should not extend beyond the base plane.

Xiaomin on Testing: During actual transportation, edible oil drums undergo multiple manual loading and unloading operations. These processes may involve drops and even throws of the packaging, making it essential to conduct drop tests to assess the integrity of the packaging during handling and装卸 (loading/unloading) activities.

Cooking oil is also essential when preparing food daily.

The quality of cooking oil is crucial.

So, plastic containers for cooking oil are equally important as well.

Most cooking oil containers are made of PET material.

Next

Let's follow Sister Xiaomin to see what testing items are performed on PET materials!

1. Appearance

Perform an appearance inspection of the sample under natural light (visual inspection), including checks for blemishes, defects, and other such issues.

Xiaomin on Inspection: The purpose is to assess the sample by examining its physical appearance—ensuring the bottle opening has a smooth, flat end face, the threads are neatly rounded with no chipping or defects, and there’s no obvious excess material or burring. Additionally, the bottle body should be perfectly molded, free of bubbles, impurities, or deformations, with uniform coloration. The bottle must stand steadily without any noticeable tilt, and the浇口 at the bottom should not extend beyond the base plane.

2. Dimensions

The main dimensions of the bottle mouth and height, Deviations in bottle mouth dimensions, height, and other parameters must all remain within the specified tolerance range.     

Xiaomin on Testing: You can check the specifications of your own PET bottles and verify whether they meet the technical requirements of the reference samples.

3. Perpendicularity

Verticality assessment evaluates the perpendicular relationship between lines, between planes, or between a line and a plane.

Xiaomin on Inspection: The increasing prevalence of automated filling lines is placing ever-higher demands on bottle verticality. Bottles with poor verticality may prevent the nozzle from properly inserting into the container during filling, potentially causing bottles to tip over and disrupting the production line. As a result, implementing verticality checks for bottles has become essential.

4. Capacity Deviation

Often refers to the size of an object's volume; the metric unit for capacity. It's a liter.

Xiaomin on Testing: Ensuring compliance with metrology laws and maintaining consistent specifications.

5. Sealing Performance

Sealing refers to the property of a package that prevents external substances from entering or its contents from spilling out.

Xiaomin on Testing: After PET bottles leave the factory, could long-term distribution and storage—due to issues like packaging leaks (air or liquid), damage, or breakage—lead to quality problems such as changes in taste or sedimentation of the contents? Additionally, preventing external microorganisms from entering is crucial for companies to avoid significant risks and financial losses.

6. Vertical Load Pressure

This test is designed to evaluate the vertical compression strength of packaging containers used in the food and beverage industry.

Xiaomin on Testing: After the lightweighting of PET bottles, their vertical load-bearing performance has also declined. Now, the bottles must not only withstand the pressure from the filling heads on the production line but also prevent issues like bottle deformation, dents, or even product collapse during stacking.

7. Drop

Drop the water-filled cooking oil drum from the height specified by the standard.

Xiaomin on Testing: During actual transportation, edible oil drums undergo multiple manual loading and unloading operations. These processes may involve drops and even throws of the packaging, making it essential to conduct drop tests to assess the integrity of the packaging during handling and装卸 (loading/unloading) activities.

8. Cold Resistance

It refers to the low-temperature resistance of polymer synthetic materials—specifically, the extent to which they retain their functional performance at cold temperatures.

Xiaomin on Testing: Plastics become increasingly hard and brittle as temperatures drop, offering valuable insights for products designed to thrive in the harsh, cold climates of Northern regions.