In the plastic machinery processing, we often encounter a variety of plastic processing faults. What kind of professional terms are used to express these faults more accurately in the plastic machinery industry? Let's analyze the professional terms of plastic processing faults one by one.

1. Under note: in plastic processing, due to inadequate cavity filling, resulting in incomplete appearance of plastic parts.

2. Overflow flash: in the process of plastic molding, it overflows into the gap between the closing surface of the mold and remains the residual material on the plastic part.

3. Weld mark: a kind of linear mark on the surface of plastic parts, which is caused by the flow of several streams of materials during injection or extrusion in the mold. The molten materials are not completely fused at the interface, so they can not be fused into one, resulting in the fusion mark, which affects the appearance quality and mechanical properties of plastic parts.

4. Wave current mark: due to the improper flow of molten material in the mold cavity, the surface of the plastic part will produce ring shaped, spiral shaped or cloud shaped wavy and uneven defects.

5. Surface turbidity: refers to the cracks with voids on the surface of plastic parts and the resulting damage. The phenomenon of external or internal cracks of plastic parts caused by long-term or repeated application of stress lower than the mechanical properties of plastics is called stress cracking; the phenomenon of sudden complete fracture of plastic parts due to constant load for a certain time at a specific temperature is called stress cracking; the crack and fracture of some thermoplastic parts over exposed to higher temperature is called thermal stress crack.

6. Fracturing: it refers to the obvious cracks in one or more layers of reinforced material outside the laminated plastic which can be seen through the resin layer covered on the surface.

7. Wrinkle: a defect on the surface of a laminated plastic that causes cracking and distinct separation.

8. Wrinkle: in the process of plastic processing, one or more layers of plastic surface appear crease or wrinkle appearance defects.

9. Cracking and whitening: the more obvious micro cracks on the surface of plastic parts are called cracking, and the frost like micro cracks similar to cracking are called whitening. Both cracking and whitening are micro cracks without cracks. When plastic parts are exposed to certain chemicals or under stress conditions, environmental stress cracking will occur.

10. Silver wire: needle like silver white frost like fine lines on the surface of plastic parts along the direction of material flow.

11. Stripe: linear stripe defect on the surface or inside of plastic parts.

12. Speckles: mica flake dark spots on the surface of plastic parts due to poor dispersion or mixing of pigments and other reasons.

13. Orange peel: the appearance defect on the surface of plastic parts, which is as uneven as orange peel.

14, bubble stripe: refers to foam plastic, and its inherent bubble structure is very different from the bubble layer.

15. Black spots: in the process of plastic processing and molding, the molten material is overheated and decomposed under high temperature and high pressure, resulting in black carbonization points on the surface of plastic parts.

16. White spots or bright spots: in transparent or translucent plastic film, sheet or plastic parts, there are particles that are not fully plasticized, and white particles can be seen by light transmission, which is called "fish eye". If the material is opaque or colored, such particles are called white spots or bright spots.

17. Pockmarks: small regular or irregular pits on the surface of plastic parts, usually with the same depth and width.

18. Filler spot: obvious spot in plastic parts caused by the presence of filler such as wood powder or asbestos.

19. Dark spot: a dark stain that appears in a fabric based laminate structure.

20. Scorch and paste spot: in the process of plastic processing, under the condition of high temperature and high pressure molding, the molten material is carbonized due to overheating decomposition, and the carbonized coke is mixed in the molten material to form spots on the surface and inside of the plastic parts.

21. Bubble: in the process of plastic processing and mold filling, if a large amount of gas remains in the molten material or the air in the mold cavity is not completely drained, the defects of small volume or series of pores will be formed in the plastic parts after molding.

22. Vacuum bubble or dark bubble: when plastic parts are processed, cooled and solidified, due to the different cooling rates inside and outside, sometimes the outer surface has been cooled and solidified, but the interior is still in a hot-melt state. Once the central part is cooled and contracted, vacuum holes will appear inside the plastic parts. Such holes are generally called vacuum bubbles or dark bubbles, also known as shrinkage holes.

23. Pinhole: pinhole size through hole defect in plastic sheet or film.

24, deflated foam: the local density increase caused by the damage of cellular structure during the manufacturing process of foam plastics.

25. Depression and shrinkage: during the cooling process of plastic processing, the surface layer of plastic parts is cooled and solidified first, and then the internal or wall thickness parts are cooled and solidified, so that when the volume shrinks, the internal and external shrinkage rates are not consistent, and the surface layer of plastic parts is stretched by the internal part to form depression, resulting in shallow pits or pits.