Cosmetic Packaging Lipstick Tube Filling Process Issues and Solutions

With the rapid development of the cosmetics industry, lipsticks, as an important category, have packaging quality that directly affects the image of the product and the consumer's user experience. As an important component of cosmetic packaging, lipstick tubes are highly scrutinized for common problems and solutions during the filling process.

**I. Common Problems During the Filling Process**

1. **Black Specks or Foreign Matter**: This is one of the common defects in lipstick filling, which may be caused by plating debris from packaging materials, foreign matter brought in by static electricity, inadequate mold cleaning, or incomplete dispersion of pigment powder. Solving this issue requires improving the dust removal rate of packaging materials and the cleanliness of molds, as well as perfecting the mixing process.

2. **Wall Scraping Issue**: This issue often occurs when filling against-the-wall packaging materials or when the formula is too soft, possibly caused by poor concentricity of packaging materials, a formula that is too soft and does not match the packaging, or inappropriate storage and transportation conditions. Solutions include predicting the compatibility of the formula with the packaging material, making improvements and controls in advance, as well as conducting compatibility and stability tests, and drop and transportation tests.

3. **Air Bubble Issue**: The cause of air bubbles may be bubbles generated in the material during mixing, or bubbles caused by inappropriate filling speed or temperature. The solution should focus on the degassing process during mixing and adjusting process parameters such as temperature and cooling speed during filling.

4. **Drop Test Failure**: With the popularity of online sales, the requirements for drop tests have become increasingly strict. Drop test failures may be caused by a formula that is too soft, insufficient grip of the packaging's inner cup, insufficient depth of lipstick filling into the inner cup, or excessively large and deep contraction holes within the lipstick formula. Targeted solutions include increasing the hardness of the formula, increasing the height and width of the inner cup's grip ribs, controlling the distance between the bottom of the formula and the bottom of the inner cup, and increasing remelting or secondary filling to reduce contraction holes.

**II. Solutions**

1. **Improve the Cleanliness of Packaging Materials and Molds**: Regularly clean and maintain packaging materials and molds to reduce the risk of foreign matter and contamination.

2. **Optimize Formulas and Processes**: Adjust the formula of the lipstick to ensure compatibility with the packaging material, and optimize filling process parameters such as speed and temperature to reduce the generation of air bubbles.

3. **Strengthen Quality Control**: Implement strict quality control measures during the production process, including the inspection of packaging materials, monitoring of the filling process, and testing of finished products to ensure product quality meets standards.

4. **Enhance Packaging Material Design**: Design more rational packaging structures to improve the concentricity of packaging materials and the grip force of the inner cup to pass drop tests.

Through the aforementioned measures, it is possible to effectively solve the problems in the lipstick tube filling process, enhance product quality, strengthen consumer confidence, and promote the healthy development of the cosmetics industry.