The popular acrylic bottle design consists of an oval-shaped container and a piston. Operating on the principle of spring-driven contractions, it effectively prevents air from entering the bottle and employs atmospheric pressure to move the piston forward. However, it is critical to note that the contraction force between the piston and the bottle's wall must not be excessive, as this could impair the ease of use. Even if a specialized force is utilized to advance the piston, it would not suffice for day-to-day usage, and leakage requires the manufacturer's strict attention to detail.
Acrylic bottles have undoubtedly brought us great convenience, particularly in the cosmetics industry. Their ability to safeguard the quality of the product and keep it fresh is highly effective. The vacuum technology used to create acrylic bottles is responsible for their relatively high price. As a result, their widespread use is still limited.
However, as consumer demand continues to expand, we expect to see significant progress in meeting the needs of different levels of skin care products. Even though the application of acrylic bottles is currently limited, they have shown enormous potential in the future.
In conclusion, if you are seeking to purchase a highly efficient container for your skin care products, acrylic bottles may be a fantastic option. They offer a superior combination of convenience, quality, and freshness. As technology advances, we expect their application to become more extensive, resulting in them becoming more affordable for everyone to use.
Acrylic bottle processing technology
1. Casting
In the process of producing plexiglass plates and rods, cast molding is utilized. This method involves forming the desired shape through bulk polymerization. However, the product requires post-treatment after the casting process. The post-treatment conditions involve subjecting the product to temperatures of 60°C for 2 hours and 120°C for another 2 hours.
2. Injection molding
The suspension polymerization process produces particles that are suitable for use in injection molding, which can be carried out using standard plunger or screw injection molding machines. However, to ensure the quality of the final products, post-processing is required to eliminate internal stress. Post-processing involves placing injection-molded products in a hot air circulation drying oven with a temperature of 70-80°C for approximately 4 hours, depending on the thickness of the product. This step helps to ensure that the products are of high quality and meet the desired specifications.
3. Extrusion molding
PMMA can be extruded to create a variety of products, including pipes, sheets, rods, and plates. Suspension polymerization produces particles that are incorporated into the extruded product. However, the low molecular weight of the polymer results in profiles that have lower mechanical properties, heat resistance, and solvent resistance compared to profiles formed through casting. Casting also has production efficiency advantages, which is particularly useful for making pipes and other difficult-to-manufacture molds using pouring methods.
Extrusion can be carried out using either a single-stage or two-stage vented extruder. The screw length-to-diameter ratio is usually between 20-25. To achieve the desired product, typical process conditions for extrusion molding are outlined in Table 2.
4. Thermoforming
Thermoforming is a technique utilized to create products in different shapes and sizes from plexiglass or plastic sheets. This method involves cutting a billet of the required size and clamping it onto a molding frame, which is then heated to soften it. The softened billet is subsequently pressed against the mold surface to achieve a similar shape to the mold. Once cooled and shaped, the edges are trimmed to obtain the desired product.
Pressurization can be done in two ways- either through vacuum drawing or by direct pressurization through a punch with a profile. To ensure optimal results, it is crucial to maintain the recommended temperature range, as per Table 3. For rapid vacuum low-draw molding products, it is advisable to maintain a temperature closer to the lower limit. On the other hand, when forming complex shapes and deep draft products, it is best to use temperatures closer to the upper limit. Room temperature is usually the ideal temperature for thermoforming.