How are vacuum insulated stainless steel bottles made? Compared to plastic water bottles, vacuum insulated stainless steel water bottles may be more popular for various occasions. Ervan China Stainless Steel Bottle Wholesale Manufacturer will give you a detailed introduction to the production process of vacuum insulated stainless steel water bottles, so that you can easily understand.

Principle of heat insulation

It is generally a water container with a vacuum layer made of ceramic or stainless steel. It has a cap on top which is tightly sealed.

There are three ways of heat propagation: radiation, convection and conduction. The silver bottle in the thermos can reflect the radiation of hot water, the bottle and vacuum can block the transfer of heat, and the bottle that is not easy to transfer heat can prevent convection.

That's why insulated water bottles keep drinks hot or cold for longer.

raw material

There are three types of stainless steel commonly used:

1. S201: Due to the high manganese content, the material of 201 is easy to rust. In terms of corrosion resistance, it is much worse than 304, and the price is much cheaper.

2. S304: 304 stainless steel is the most common and widely used stainless steel material. It is not easy to rust, has good quality and relatively high price.

3. S316: 316 stainless steel is an imported material, which is used in some high-end products, such as aerospace, food machinery, medical and other fields, and the price is relatively high.

manufacturing process

1. Pipe cutting: Cut the raw material into a suitable length.

2. Water expansion: stainless steel pipe is the raw material of this method. First, place the stainless steel pipe over the water expander. The pipe expands into a bottle under enormous pressure. The bottle obtained in this way has no bottom, so a round stainless steel plate is welded on it to form a complete bottle.

3. Separation: Use an instrument cart to cut off the two layers of shells that have swollen with water.

4. Positioning and shaping: use a large press to get the outer bottle you want, and ensure that the pit, size and shape of the outer bottle meet the requirements.

5. Reinforcement against impact: Flatten the welding seam of the shell with a small pressure, so that there will be no jump welding at the welding seam, so that the welding seam is smooth and uniform.

6. Shrinking: Squeeze the top of the bottle with a machine to shrink it.

7. Flat mouth and flat bottom: cut off the excess part of the flat bottom of the mouth.

8. Thread rolling: Use a special thread rolling machine to adjust the thread depth to meet the size requirements.

9. Ultrasonic cleaning and drying: the inner and outer bottles are cleaned and dried.

10. Assembly: Assemble the round bottom inner and outer bottles.

11. Weld the bottom and top of the bottle

12. Vacuum pumping: adopt machine tailless vacuum technology and strictly follow the vacuum pumping standard. A vacuum is formed between the inner tank and the outer bottle to prevent heat transfer, play a role of heat insulation, and prevent hot hands.

13. Water leakage test: Check whether the welding of the inner and outer bottles is in good condition and reject unqualified products.

14. Electrolysis: Through the interaction between the current and the electrolyte, the microscopic geometry of the metal surface is improved, and the roughness of the metal surface is reduced, so as to achieve the purpose of making the surface of the stainless steel bottle smooth and bright. The surface of the inner bottle is bright and uniform, without watermarks and yellow spots.

15. Temperature measurement: Vacuum heat insulation test: put hot air into the bottle, if the outer layer is cool, the hot air will not transfer, and the water bottle has the effect of heat insulation.

temperature measurement

16. Surface treatment (spraying station, spraying line): powder coating, spraying.

surface treatment

17. Patterns and Logo: Print graphic designs and logos on bottles using a variety of techniques - screen printing, heat transfer, water transfer, laser etching, etc.

18. Packaging_