What are the main materials of food grade plastic water cups
Inspection method for food-grade plastic water cups

When buying a water bottle, the most important thing is to look at its material, which involves the safety of the entire water bottle. There are four common plastic materials on the market:

  • PC (polycarbonate)

  • PP (polypropylene)

  • Tritan (Tritan Copolyester)

  • PPSU (polyphenylsulfone)

1. PC material

PC itself is not poisonous, but PC (polycarbonate) material is not resistant to high temperature. If it is heated or in an acid or alkaline environment, it is easy to release the toxic substance bisphenol A. Some research reports show that bisphenol A can lead to endocrine disorders, cancer, obesity caused by metabolic disorders, and precocious puberty in children may be related to bisphenol A. Many countries, such as Canada, banned the addition of bisphenol A in food packaging in the early days. China also banned the import and sale of PC-made baby bottles in 2011.

If you buy a PC material water bottle, please buy it from a formal channel to ensure its production compliance. Personally, it is not recommended to buy a PC material water bottle.

2. PP material

PP polypropylene, colorless, odorless, non-toxic, translucent, does not contain bisphenol A, flammable, melting point is 165 ° C, it will soften at about 155 ° C, the operating temperature range is -30 ~ 140 ° C. PP cutlery cups are also the only plastic materials that can be used for microwave heating.

3. Tritan material

Tritan is also a chemical polyester that solves many of the drawbacks of plastics, including toughness, impact strength, hydrolytic stability, chemical resistance, high transparency, and no bisphenol A in PC. tritan has passed the FDA certification (Food Contact Notification (FCN) No.729) of the United States Food and Drug Administration, and is the designated material for infant products in Europe and the United States

4. PPSU material

PPSU (polyphenylsulfone) material is an amorphous thermoplastic, which can withstand high temperature from 0°C to 180°C, can be filled with hot water, has high permeability and high hydrolysis stability, and is a baby bottle material that can withstand steam sterilization. Contains the carcinogenic chemical bisphenol A.

Inspection method for food-grade plastic water cups

1. Miscellaneous dots (including impurities): It has the shape of a dot, and its maximum diameter is its size when measured.

2. Burrs: Linear bulges (usually due to poor molding) at the edges or bond lines of plastic parts.

3. Silver Wire: The gas formed during molding discolors the surface of the plastic part (usually white). Most of these gases

Because of the moisture in the resin, some resins are easy to absorb moisture, so a drying process should be added before manufacturing.

4. Air bubbles: The isolation area inside the plastic creates rounded protrusions on its surface.

5. Deformation: Deformation of plastic parts caused by differences in internal stress or poor cooling during manufacturing.

6. Top white: The whitening and deformation caused by the finished product being ejected from the mold usually occurs at the other end of the ejection point (the surface of the female mold).

7. Lack of material: Due to the damage of the mold or other reasons, the finished product has a shortage of unsaturated material.

8. Broken printing: white spots in the printed fonts caused by impurities or other reasons during printing.

9. Missing printing: The printing content is missing or missing corners or the font is broken and the printing defect is greater than 0.3mm, which is also considered to be missing printing.

10. Color difference: refers to the comparison between the actual part color and the approved sample color or color number that exceeds the allowable value.

11. The same color point: refers to the point whose color is close to the color of the part; otherwise, it is a different color point.

12. Water streaks: due to forming reasons, the hot melt plastic flowing streaks left at the gate.

13. Weld Line: A linear trace formed on the surface of a part due to the convergence of two or more streams of molten plastic.

14. Assembly gap: In addition to the gap specified in the design, the gap caused by the assembly of the two components.

15. Fine Scratches: Surface scratches or marks without depth (usually caused by manual operation).

16. Hard Scratches: Deep linear scratches on the surface of parts caused by hard objects or sharp objects (usually caused by manual operation).

17. Dent shrinkage: There are dent marks on the surface of the part or the size is smaller than the design size (usually due to poor molding).

18. Color separation: In the production of plastics, stripes or dots of color marks appear in the flow area (usually caused by the addition of recycled materials).

19. Invisible: It means that the diameter of the defect is less than 0.03mm is invisible, except the transparent area of ​​LENS (according to the detection distance set by the material of each part).

20. Bump: The product surface or edge is hit by a hard object.

The above belongs to the appearance inspection of plastic water cups. To identify the quality of the water cups, functional inspections are also required. For details, please contact QCANT quality experts.

6 Points about furniture inspection
wooden furniture inspection standards and methods