The Flip-top cap here refers to a plastic bottle cap that can be lifted up on the top, and the main body of the bottle cap can be fixed on the container bottle through the form of spiral or clip, and the liquid in the bottle can be poured out after the Flip-top cap is opened, which is easy to use. Since Flip-top caps can achieve one-handed operation, it has good convenience for the use experience of consumers, so it is widely used in the packaging material design of shampoo, shower gel, hose and other products. The following is mainly introduced from three aspects of Flip-top Caps appearance, Flip-top Caps structure and Flip-top Caps raw materials.
1 Flip-top Caps appearance
At present, the Flip-top Caps design on the market is also colorful and diverse.
2 Flip-top Caps raw materials
The raw material usually used for Flip-top Caps is PP material.
3 Flip-top Caps structure
Usually the Flap-top Caps is composed of the ①lower cover, ②the liquid hole, ③the hinge, ④the upper cover, ⑤the plunger, ⑥the inner plug and other important parts.
The Flip-top structure is fixed with the bottle body, mainly in two ways. Spiral or clip, usually called the Screw Type Flip-top Cap and Clip Type Flip-top Cap.
The lower body of the screw flap is screwed together with the screw thread in the bottle cap.
As shown in Figure , Clip Type Flip-top Cap is fastened by fastening the buckle ring of the flip cap with the flange ring of the bottle body.
1). Hinge part
In addition to the Flip-top structure and the bottle body of the fixed part of the important. There is a hinge part of the flip-top, usually hinged structure of the main three major styles of type: one-piece, butterfly type, type of strap type. Specifically as shown in Figure（From left to right are: one-piece, butterfly style, belt style）
Each of the three structural of Flip-top caps hinges has its own advantages and disadvantages.
One-piece
- Advantage: The hinge only plays the role of connection, no elasticity requirement in the process of flap, simple mold structure design and production process control, low cost.
- Disadvantage: No elasticity in the flip-top process.
Butterfly type
- Advantage:The butterfly type hinge with elastic function for a good user experience during use and the hinge has an attractive appearance.
- Disadvantage:The wall thickness design and molding control requirements of the thinnest part of the hinge connection are high, the length of the hinge connection section (the part pointed out by the red line segment) is longer compared to the strap type, and the hinge molding is very thin due to the cavity, the raw material is more prone to stagnation, fusion line and other problems.
Type of strap type（Tri-axial）
- Advantage:In the process of using, the hinge with elastic function, the user experience is good, (red line segment pointed out) hinge molding difficulty is relatively low compared to the butterfly type hinge.
- Disadvantage:In the process of using, the hinge with elastic function, the user experience is good, (red line segment pointed out) hinge molding difficulty is relatively low compared to the butterfly type hinge.
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