How to Make a Stainless Steel Insulation Bottle (Vacuum Flask)？

Vacuum flasks are indispensable in our life, and it is a good companion for our daily travel. Vacuum flasks are the most popular among the thermos products. Healthy and environment-friendly are the biggest features of stainless steel vacuum flasks. Stainless steel vacuum can maintain the temperature of the water and food in the container for a long time, which not only can be convenient for users to enjoy hot food or hot drinks at different time and spaces, but also be conducive to improving people’s quality of life. And promoting the use of stainless steel thermos not only can reduce the environmental pollution caused by the waste of single-use plastic containers and paper cups, but also reduce the consumption of natural resources such as oil, wood and water. At the same time, the stainless steel thermos bottles also integrate various popular fashion elements to meet the needs of consumers.

So how to make the stainless steel vacuum flask/ thermos bottles?

The stainless steel vacuum flask is made of double walls stainless steel inside and outside, and the air in the interlayer between the inner tank and the outer shell is extracted by welding technology to achieve the effect of vacuum heat preservation. Following are the specific operation steps.

Inner bottle making

1.     Pipe making from stainless steel coil

The stainless steel plate is made into a roll shape of the required size, and the joints are welded.

2.     Pipe dividing

Cut the finished tube to the corresponding length.

3.     Pipe ends deburr rolling

After branching, the end of the pipe needs to be deburred to make the part smooth.

4.     Pipe ends welding seam flatten rolling

Flatten the welded seam of the pipe.

5.     Shape forming by water bulging

The pipe is expanded into the corresponding shape by the solution pressure.

6.     Cut 1pcs of bulged pipe into 2pcs

Cut the swollen tube into two bottles

7.     Neck spinning

Bottle neck shape by spinning. According to the required output, there are two-station and three-station options.

8.     Rim scrap cutting

Cut off the excess corner waste from the bottle mouth to make the bottle mouth flat

9.     Bottom expanding

The bottom is slightly rounded to facilitate subsequent welding of the bottom of the bottle

10.  Top and bottom edge trimming

Trim the top and bottom edges of the bottle

11.  Leak-proof neck forming

Rotate the inner pressure at the neck of the cup to make it form a leak-proof opening and fit the lid of the cup

Outer Bottle making

The first eight steps are the same as for inner bottle making

9.     bottom and mouth uniform shaping

Re-edging the bottom and the bottle mouth and trimming them evenly to avoid dimensional deviations

10.  Screw Threading

Roll out a turn of thread at the neck of the neck

11.  Top and bottom edge trimming

Cut off the excess part of the bottle mouth and bottle bottom

12.  .Slightly edge bending

Make the beading of the bottle mouth , to let the edge become smooth and to bring better using experience and safety for users.

Bottom cap and lids making

1.     Inner bottom blanking and forming

Press out the round sheet required for the bottom of the cup on a stainless steel plate, which is used to make the inner bottom and lid

2.     Inner bottom edge trimming

Edge cutting and smoothing of round sheets

3.     Outer bottom forming

Press the circular sheet into the shape of the desired model, by using hydraulic press machine.

4.     Outer bottom cap edge cutting

Cut off the excess part of the bottom cap edge after hydraulic pressing

Ultrasonic cleaning

The ultrasonic generator sends out a high-frequency oscillation signal to make the dirt leave the surface of the cleaning part, so as to achieve the function of cleaning the bottle and improve the bottom welding yield.

Welding

1.     Inner bottom welding

The finished inner bottle bottom is connected to the bottle body by welding. According to the production volume, the single station or double stations can be selected. For welding, there are argon arc welding or laser welding for options.

2.     Welding leakage testing

Press the welded bottles into water to check the leakage.

3.     Copper plating

Coat the outer surface of the finished bottle with a copper color to make it smooth and shiny

4.     Mouth welding (inner and outer welded together)

Weld the mouths of the inner and outer cups together

5.     Getter spot welding

   Spot-welded getter in the bottom for subsequent vacuuming

6.     Middle bottom welding

   Weld the bottom part with the bottle body

7.     Adding vacuum solder to middle bottom

   After adding the vacuum-pumpable flux to the middle point of the bottom of the cup and bottle after welding, send it to the vacuum machine for vacuuming.

8.     Mouth welding seam grinding

Grind the welded part of the mouth to make the mouth more smooth and not hurt when the user drinks water.

9.     Body polishing、Outer bottom polishing

Polish the bottle body and the bottom of the outer cup to make it smooth and bright

10.  Outer bottom pressing

Use a bottom press machine to press the polished bottles to the bottom caps.

11.  Insulation cup external process

According to various needs, there are different crafts:  

Auto spray painting

Screen printing - to print the company logo or some other words

Laser marking - customized patterns or logo, UV printing, ect.

12.  bottle lid matching

Match or make the corresponding bottle lid to complete the whole thermos cup.