Key Factors Affecting the Sealing Performance of Lotion Squeeze Tubes
Release time:
Oct 28,2025
In the cosmetics and personal care product packaging sector, lotion squeeze tubes are widely used for their lightweight, easy-to-squeeze, and aesthetically pleasing features. However, the sealing performance of lotion squeeze tubes is directly related to product safety and user experience. Poor sealing not only leads to leakage of contents but can also cause oxidation and contamination, impacting product quality and brand image. The following will analyze the key factors affecting the sealing performance of lotion squeeze tubes from multiple perspectives.
First, material selection is fundamental to determining sealing performance. Lotion squeeze tubes are typically made of PE (polyethylene), PP (polypropylene), or multi-layer composite materials. Different materials vary in their barrier properties, flexibility, and heat-sealing characteristics. For example, multi-layer composite tubes (such as PE/EVOH/PE structures) offer superior resistance to oxidation and permeation, making them suitable for skincare products with high shelf life requirements. Insufficient material thickness or inconsistent quality can easily lead to uneven force at the seal, compromising the sealing effect.
Second, the end-sealing process plays a decisive role in sealing quality. Lotion squeeze tubes are typically sealed using heat sealing, fusing the tube ends together at high temperatures. Sealing temperature, pressure, and time require precise control: excessively high temperatures can cause deformation or charring of the tube, while excessively low temperatures prevent complete fusion, resulting in tiny gaps. High-quality manufacturers often use automated sealing equipment and adjust process parameters based on tube diameter and material to ensure a tight and smooth seal on each tube.
Third, the precise fit between the nozzle and cap is also crucial. The sealing of lotion squeeze tubes depends not only on the sealing, but also on the thread structure and fit between the nozzle and cap. Improper thread design or inaccurate injection molding can lead to loosening or leakage after tightening. High-quality packaging is typically manufactured using precision molds to ensure a tight fit between the nozzle and cap, preventing leakage during transportation or storage.
Furthermore, the filling process and environmental control are crucial for sealing quality. During the filling process, the filling volume should be controlled to avoid excessive pressure on the seal. Furthermore, the production environment must be kept clean and dry to prevent impurities from entering the sealing area, which could affect the heat seal.
Finally, testing and quality control are crucial. High-standard manufacturers typically employ vacuum leak tests or compression seal tests to ensure that each batch of tubes maintains a stable seal during transportation and use.
The sealing performance of lotion squeeze tubes is influenced by multiple factors, including materials, process, structural design, and quality testing. Only by rigorously controlling every step from the source can lotion squeeze tubes be guaranteed to be leak-proof and contamination-proof during use, providing safe and reliable packaging for cosmetics brands.
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