Cosmetics packaging procurement knowledge (about plastic bottles)

[China Packaging Network News] Plastic bottles are commonly manufactured using materials such as PP (polypropylene), PE (polyethylene), PET (polyethylene terephthalate), AS (acrylonitrile styrene), ABS (acrylonitrile butadiene styrene), acrylic, and others. These materials are chosen based on their specific properties and the intended use of the packaging. For example, PP and PE are often used in injection molding for cosmetic containers like cream jars, bottle caps, stoppers, gaskets, pump heads, and dust covers, especially when thicker walls are required.

PET is a popular choice due to its environmental friendliness, lightweight nature, excellent barrier properties, and strong transparency. It can also be produced in various finishes, such as pearlescent, colored, magnetic white, or transparent. PET is typically processed using a two-step blow molding method: first, a preform is injection molded, then it is blown into the final shape. This material is widely used in packaging for gel and water products. The necks of these bottles are usually standardized at 16#, 18#, 22#, or 24# diameters, allowing compatibility with various pump heads.

Acrylic bottles, on the other hand, are generally made through injection molding. However, they have limited chemical resistance, which means they are not ideal for holding thick pastes directly. To prevent damage, an inner baffle is often used to avoid direct contact between the product and the bottle. These bottles require careful handling during transportation, as scratches are highly visible. Additionally, acrylic has higher permeability and may require a thicker wall for better performance, though this makes them more expensive compared to other materials.

AS and ABS are both common thermoplastics. AS offers better clarity and toughness than ABS, making it suitable for applications where visual appeal is important. However, ABS is more impact-resistant and is often used for more durable packaging needs.

When it comes to color customization, orders typically start from 10,000 units. Common color options include primary colors, magnetic white, or pearl-effect finishes. While the bottle and cap can be matched in color, differences in material composition may lead to slight variations in appearance. This is something to consider when designing the final product.

Silk screen Printing is a popular method for applying graphics and text onto plastic bottles. Both regular ink and UV ink are used, with UV ink offering a glossy, three-dimensional finish. It's important to confirm the color during the first print run, as the appearance may vary depending on the material being printed on.

Other finishing techniques, such as bronzing or hot stamping with gold or silver powders, produce different effects. Hot stamping works best on hard, smooth surfaces, while soft or textured surfaces may not hold the design well and could result in peeling. Gold and silver finishes tend to look more vibrant on certain materials, especially in regions like India where traditional aesthetics are valued.

For screen printing, a negative film is typically used for silk screen films, resulting in dark graphics against a transparent background. In contrast, gold foil or hot silver stamping requires a positive film with transparent graphics and a dark background. Text and patterns should be designed with sufficient size and detail to ensure visibility and clarity during printing.

Bottle caps usually come with internal seals, pull-off caps, or inner stoppers, though some may include a small spoon or dropper. These features are primarily included for improved sealing and user convenience. The production cycle is generally moderate, taking around 15 days. Monochrome silk-screened cylindrical bottles are calculated based on one color, while flat or shaped bottles with multiple colors may require additional setup fees. The initial screen printing or fixture charges are usually included in the quotation.