**White Film Production Issues and Solutions**
White film is widely used in daily life, including courier bags, milk pouches, detergent bags, toothpaste tubes, protective films, and food packaging. The production process involves mixing white masterbatch with resin in a plastic extruder, followed by blowing, stretching, and other processes. However, due to differences in raw material selection and processing among various manufacturers, as well as improper selection of white masterbatch by film producers, several common issues may arise during the production process. Below are some typical problems and their solutions for your reference.
**1. Crystallization on the Film Surface**
- **Material Issues**:
- Excessive use of recycled materials.
- Addition of fillers in the masterbatch.
- Quality issues in the polymerization process of new blown film material.
- **Masterbatch Problems**:
- Poor dispersion of the white masterbatch.
- High moisture content in the masterbatch.
- Insufficient density of the filter in the masterbatch.
**2. Color Flow Pattern on the Film**
- Incompatibility between the masterbatch and the blown film material.
- Improper gap setting in the screw of the blown film machine.
**3. Poor Heat Sealing and Printing Adhesion**
- Partial cross-linking occurs during corona treatment.
- Incorrect type of dispersant was added in the masterbatch formulation.
- Excess dispersant was added in the white masterbatch.
- Slip agents in the film affect the sealing performance.
**4. Bubbles on the Film Surface**
- **Material Issues**:
- Use of recycled or filler materials.
- Quality problems in the polymerization of new materials.
- **Masterbatch Issues**:
- Poor dispersion of the white masterbatch.
- High moisture content.
- Overuse of low molecular weight dispersants.
- Incompatibility between color masterbatch and blown film material.
**5. Yellowing or Discoloration of the Film**
- Incorrect use of titanium dioxide in the white masterbatch.
- Presence of phenol or hindered phenolic antioxidants.
**6. Unpleasant Odor from the Film**
- Dispersants in the white masterbatch contain animal fats.
**7. Excessive Deposits on the Blown Film Die**
- High content of low molecular weight dispersants in the masterbatch.
- Presence of slip agents in the blown film material.
By addressing these issues through proper material selection, masterbatch compatibility, and process optimization, manufacturers can significantly improve the quality and performance of white film products. It's important to work closely with suppliers and conduct regular testing to ensure consistent results.
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