1、Solvent reason

　　For general hard body general-purpose materials such as ABS and HIPS, the paint will usually be combined with a weaker chemical properties of the solvent. In order to ensure that the rubber parts in the spray oil can still maintain a smooth surface and not damage the physical strength.

　　On the other hand, soft-bodied general purpose plastics, such as PVC, are usually combined with a solvent with stronger chemical properties. Since soft plastic parts have a certain degree of deformation and elongation, strong solvents ensure that the paint sticks firmly to the plastic parts, even if the soft plastic parts are deformed, it is not easy to detach them.

　　TPE combines the characteristics of soft and hard rubber into one. If there is a problem when spraying oil, it is often due to a mistake in choosing the solvent, which can lead to burning and degreasing.

　　① Burning glue - mainly occurs in the TPE hardness of more than 70 degrees of the plastic parts, because the solvent used is too strong, in contact with the plastic parts when the surface is seriously corroded, and leave a line, which is the so-called burning glue occurred.

　　②Grease removal - It mainly happens to the plastic parts with TPE hardness less than 70 degrees. Because the solvent used is too weak, the paint can not be firmly attached to the surface of the plastic parts. Once the soft plastic parts are deformed, the paint itself cannot follow the shape change, causing the surface layer to be separated, resulting in oil release.

　　2、Module design

　　If the surface of the product is uneven, such as the face of the doll, the situation of burning glue often occurs. The reason is that the uneven part usually has solvent accumulation, and the chance of burning glue increases naturally.

　　3、Water mouth material (copy) composition is too much

　　Manufacturers will generally add different proportions of water mouth material when producing. But the water mouth material will make the rubber parts of the chemical resistance is reduced, when the pure raw material products can withstand the solvent, for the products containing water mouth material is too strong, so there is burning glue situation.

　　4、TPE with PP or PE ingredients

　　Some TPEs contain PP or PE components to enhance adhesion performance. However, PP and PE are chemically resistant rubber, so the oil spraying performance of such TPE products is poor.