Wholesale Plastic Flip Lid Bottle Manufacturers

What are the characteristics of the design of plastic flip lid bottle?

Combining functionality and humanized design

The biggest advantage of plastic flip lid bottles is their integrated opening structure design, which is convenient for users to operate with one hand and avoid losing the bottle cap, while also enhancing the hygiene and sealing of use. Shaoxing Roman Plastic Co., Ltd. widely adopts ergonomic principles in the design of flip lid bottles, optimizes the opening angle and opening and closing force of the flip lid, so that it is easy to operate while ensuring that it will not easily loosen or leak. This type of structure is particularly suitable for small-volume products that need to be used repeatedly, such as shampoo, lotion, and facial cleanser.

For example, for cosmetics customers, our design team will select different bottle mouth sizes and resistance structures according to the frequency of use and texture characteristics of the product to ensure that while ensuring user experience, the amount of liquid can be accurately controlled to reduce waste.

Material selection and sealing performance
High-quality plastic flip lid bottles must not only be beautiful, but also durable, safe and well sealed. Shaoxing Roman Plastic Co., Ltd. uses mainstream materials such as PP (polypropylene), HDPE (high-density polyethylene), and PET (polyethylene terephthalate) to customize and develop in combination with customer needs. PP material has good chemical corrosion resistance and flexibility, which is suitable for the hinge design of the flip-top structure, while PET has high transparency and good airtightness, and is widely used in high-end toiletries or cosmetics packaging.
In addition, we have a professional sealing test process, through negative pressure, drop, hot and cold cycle testing and other means to ensure that the bottle cap can maintain excellent sealing performance during transportation, storage and daily use.
Manufacturing process and customization service
Since its establishment in 2016, Shaoxing Roman Plastic Co., Ltd. has accumulated more than nine years of experience in plastic packaging manufacturing. The company covers an area of ​​13,000 square meters, has more than 50 injection molding equipment and more than 15 assembly lines, with an annual export volume of 4-5 million US dollars, and its products are exported to many countries and regions such as the United States, Germany, Australia, Canada, and the Middle East.
We provide full-process OEM/ODM customization services, and can tailor the color, structure and decorative effects of flip-top bottles according to the customer's brand style and product positioning. With the help of advanced spraying, UV coating, silk screen printing, hot stamping and labeling technology, we can not only provide basic functional packaging solutions, but also enhance the visual impact and brand recognition of products.

What are the most critical quality control points in the injection and blow molding process of plastic flip lid bottle?

Key points of quality control in injection molding process
1. Mold accuracy and maintenance
The opening and closing structure of the plastic flip lid requires extremely high mold accuracy, especially the hinge part. The matching accuracy between the mold cavity and the mold core must be controlled at the micron level to ensure smooth opening and closing of the lid and reliable closure and sealing. Shaoxing Roman Plastic Co., Ltd. adopts CAD/CAM integrated system and periodic maintenance mechanism in mold design and maintenance to ensure long-term stable mold performance.
2. Injection molding parameter control
Parameters including melt temperature, injection pressure, cooling time, etc. play a decisive role in the appearance flatness, dimensional stability and internal stress control of the product. We have developed a strict process parameter database, and use the PLC automation system to monitor the molding status of each mold in real time, effectively reducing the probability of quality problems such as bubbles, short shots, shrinkage, etc.
3. Material drying and purity control
The raw materials used in injection molding (such as PP, HDPE) must have an appropriate degree of dryness to avoid defects such as silver streaks and blistering caused by water vapor during the molding process. The company has an independent raw material processing area equipped with a dehumidification and drying machine to ensure the purity and applicability of the materials.
4. Flip-top hinge fatigue test
In order to ensure the durability of the product, we will perform a cyclic opening and closing fatigue test on the flip-top bottle to verify the strength and life of the hinge under daily use. Qualified products must pass at least 5,000 opening and closing tests without breakage or deformation.
Key points of quality control in blow molding process
1. Pre-blowing and cooling control
Plastic bottles are mostly made by extrusion blow molding or injection stretch blow molding. In the blow molding process, pre-blowing air pressure, blowing delay and cavity cooling rate are the key factors affecting the uniformity of the bottle wall thickness and stiffness. Shaoxing Roman Plastic Co., Ltd. has accumulated technology for many years and parametrically controlled the blow molding curve to ensure that the bottle is lightweight and has good stiffness.
2. Tolerance control of bottle mouth and bottle cap
As the key part of the connection between the bottle body and the bottle cap, the thread structure, tolerance and coaxiality of the bottle mouth must be precisely matched with the cap mold. Our quality inspection team will use a three-dimensional measuring instrument and a rotary torque tester to detect whether the bottle mouth size and tightening torque meet the design standards to ensure that the flip cap opens and closes smoothly and leaks reliably.
3. Blow molding burrs and bottle bottom thickness detection
The bottle bottom is an area where the force is concentrated. If the thickness is insufficient, it is easy to fall and break. Shaoxing Roman Plastic Co., Ltd. sets up a combination of infrared thickness detection equipment and manual sampling to ensure that the thickness of each batch of bottle bottoms is stable and free of flow lines and cracks.
4. Transparency and bubble control
For PET transparent bottles, whether the bottle wall is clear and whether it contains bubbles or impurities is an important indicator for measuring the quality of high-end packaging. We use fully automatic optical inspection equipment and imported raw materials to ensure that the bottle body is transparent and the color is consistent, which enhances the visual beauty of brand products.