The design of sawtooth number depends on the preference of the manufacturer and the size of the bottle cap. Generally speaking, larger bottle caps may have more serrations to provide greater grip. In addition, the shape and size of the sawtooth can also be different to meet different consumer needs.
There were 23 and 24 serrations on the bottle cap of early beer bottles, but after continuous selection and optimization, they were fixed at 2 1. As early as the end of 19, William Pater invented the 24-tooth bottle cap and applied for a patent, because this quantity was most suitable for bottle sealing, and it became the industry standard from then on, and it was used until the 1930s. Later, with the advancement of industrialization, the 24-tooth bottle cap easily blocked the hose of the automatic filling machine, which was solved by changing to 23 teeth, and then standardized to 2 1, which is still in use today.
In addition, beer bottles are usually opened with a screwdriver. If it is not opened correctly, a large amount of gas inside will cause uneven air pressure. After the screwdriver was invented, it was finally determined that when the bottle cap was 2 1 sawtooth, it was the simplest and safest to open it with a screwdriver, which was the best of both worlds.
The production method of beer bottle caps usually includes the following steps:
Material preparation: iron sheets, aluminum sheets or plastic materials, cutting machines, molds, electroplating machines, cartons, transportation tools, etc.
1. Cutting: according to the size requirements of bottle caps, cut the prepared materials. This step is usually done by using a mold or a cutting machine.
2. Mold forming: put the cut material into a special bottle cap mold, and shape the material by high pressure or hot pressing. The mold can be customized according to the design and shape of the bottle cap.
3. Sawtooth manufacturing: If the bottle cap needs sawtooth, the molded bottle cap can be cut into the required sawtooth shape with a special mold or cutting tool.
4. Surface treatment: surface treatment of bottle caps. Common methods include electroplating, painting or spraying. This step aims to improve the appearance quality and durability of the bottle cap.
5. Inspection and quality control: inspect the finished bottle caps to ensure that they meet the quality standards and regulations. This includes checking the size, shape, sawtooth integrity and surface treatment quality of the bottle cap.
6. Packaging: Packaging qualified bottle caps, generally using automatic packaging machine or manual packaging. In order to facilitate storage and transportation, packaging usually takes the form of cartons, bags or trays.