A: If we have stock, MOQ 3000pcs. | B: If out of stock, MOQ is 10000pcs.
Views: 0 Author: Site Editor Publish Time: 2026-09-15 Origin: Site
The Double wall cosmetic jar uses an inner sleeve and an outer shell with an air gap between them. This design can reduce heat transfer and allow decorative effects between the walls. It is used for temperature-sensitive creams, probiotic formulas, and products that need a distinct shelf presence. At Guangzhou Ruijia Packaging Products Co.,Ltd, we produce Double wall cosmetic jar systems with controlled air gap width, welded seals, and decoration options. This article reviews thermal performance, structural design, testing, and technical details. It also mentions the Moisturizing cream jar, Hydrating face cream jar, Frosted moisturizer jar, and Acrylic cream jar.
The air gap in a Double wall cosmetic jar acts as a thermal barrier. Air has low thermal conductivity. A gap of 1.2 mm to 2.5 mm can reduce heat transfer. In a test at 40°C ambient for four hours, a single-wall jar allowed the internal product to rise by about 14°C. A Double wall cosmetic jar with a 2.0 mm gap allowed a rise of about 6.5°C. This difference can help protect butters and other heat-sensitive ingredients.
A Moisturizing cream jar with a single wall may not provide this insulation. A Hydrating face cream jar may also benefit from a double wall if the formula contains heat-sensitive actives. A Frosted moisturizer jar can be made with a double wall for added insulation. An Acrylic cream jar can be made with a double wall for a decorative effect.
The air gap width affects thermal performance and structural strength. A wider gap reduces heat transfer but can reduce drop resistance. A narrower gap provides more strength but less insulation.
Air Gap | Thermal Conductivity | Temp Rise at 40°C for 4 h | Drop Test Pass Rate |
|---|---|---|---|
Single wall | 0.32 W/m·K | 14.0°C | 99.1% |
1.2 mm | 0.18 W/m·K | 9.2°C | 98.2% |
2.0 mm | 0.12 W/m·K | 6.5°C | 97.5% |
2.5 mm | 0.09 W/m·K | 5.1°C | 95.8% |
The inner sleeve and outer shell of a Double wall cosmetic jar are joined at the neck. Ultrasonic welding is a common method. The weld must be strong and leak-free. The air gap should be sealed to prevent moisture entry. We test the weld with a helium leak detector. A leak rate above a set limit is rejected.
The concentricity between the inner and outer walls should be controlled. A runout above 0.25 mm can cause visual distortion. We use guided ejection and vision inspection to maintain alignment. A Moisturizing cream jar may not need this step. A Hydrating face cream jar may use a simpler design. A Frosted moisturizer jar may use a different joining method. An Acrylic cream jar may use a similar welding method.
The air gap of a Double wall cosmetic jar can hold decorative elements. These may include colored gel, metallic flakes, or printed inserts. The decoration does not contact the product. This allows more design freedom. The outer shell can be clear, tinted, or frosted. The inner sleeve can be opaque or colored.
A Frosted moisturizer jar can use a frosted outer shell with a colored inner sleeve. An Acrylic cream jar can use a clear outer shell with a printed insert. A Moisturizing cream jar can use a similar effect if a double wall is used. A Hydrating face cream jar can use a light blue gel to suggest water.
The injection molding of a Double wall cosmetic jar requires two molds. The inner sleeve and outer shell should be molded with balanced cooling. The welding process should be controlled for time, pressure, and amplitude. A poorly welded jar can leak or separate. The air gap should be uniform. A non-uniform gap can cause optical distortion. We inspect each jar with a vision system.
The filling process for a Double wall cosmetic jar is similar to a single-wall jar. The product is filled into the inner sleeve. The cap is applied. The air gap is already sealed. A Moisturizing cream jar may be filled in the same way. A Hydrating face cream jar may use a pump. A Frosted moisturizer jar may use a different cap. An Acrylic cream jar may use a different liner.
Q1 What is the main benefit of a Double wall cosmetic jar
It reduces heat transfer and allows decoration between the walls. It can protect heat-sensitive formulas and improve shelf appeal.
Q2 Can a Double wall cosmetic jar be used for a Moisturizing cream jar
Yes. A Double wall cosmetic jar can hold a rich cream. The inner sleeve must be compatible with the formula.
Q3 Is a Double wall cosmetic jar heavier than a single-wall jar
Yes, it uses more material. The weight increase depends on the wall thickness and gap width.
Q4 Can a Frosted moisturizer jar be made with a double wall
Yes. The outer shell can be frosted. The inner sleeve can be clear or colored.
Q5 How do I test the thermal performance of a Double wall cosmetic jar
Fill the jar and place it in a controlled chamber at 40°C. Measure the internal temperature over four hours. Compare with a single-wall jar.
Q6 Can an Acrylic cream jar be converted into a Double wall cosmetic jar
Yes. An Acrylic cream jar can be designed with a double wall. The acrylic outer shell offers high clarity.
Q7 What is the typical air gap for a Double wall cosmetic jar
A gap of 1.2 mm to 2.5 mm is common. A 2.0 mm gap is a balance between insulation and strength.
Q8 Can a Hydrating face cream jar use a double wall
Yes. A Hydrating face cream jar can use a double wall if the formula needs thermal protection. The inner sleeve should be selected for water compatibility.
The Double wall cosmetic jar is a package for thermal protection and visual design. Its performance depends on gap width, weld quality, and material selection. By testing thermal and structural properties, brands can select a jar that protects the product and supports the brand. Guangzhou Ruijia Packaging Products Co.,Ltd produces Double wall cosmetic jar, Moisturizing cream jar, Hydrating face cream jar, Frosted moisturizer jar, and Acrylic cream jar systems. We provide development and production support.