Manufacturing Process

Manufacturing Process of Stainless Steel Thermos

Stainless steel thermoses are a popular choice for keeping hot drinks hot and cold drinks cold. They are made from two layers of stainless steel, with a vacuum between them. This vacuum prevents heat from transferring from the hot liquid inside to the outside of the bottle, keeping your drink at the perfect temperature for hours.

The manufacturing process for stainless steel thermoses is complex and requires a variety of specialized equipment. The process can be broken down into the following steps:

Manufacturing the Outer Bottle and Inner Bottle

• Pipe Cutting: The first step is to cut the raw material, which is a stainless steel tube, to the appropriate length. This is typically done using a saw or other cutting tool.

  

  Pipe Cutting in Stainless Steel Thermos Manufacturing

• Water Expansion: The outer bottle is typically formed using the water expansion process. This process involves placing the stainless steel tube in a water expander, which applies a high-pressure water jet to the tube. The water jet expands the tube into the desired shape of the outer bottle.

  

  Water Expansion in Stainless Steel Thermos Manufacturing

• Separating: If the outer bottle is formed using the water expansion process, it must be separated into two parts. This is done by cutting the tube with a saw or other cutting tool.

   

  Separating in Stainless Steel Thermos Manufacturing

• Positioning and Shaping: The outer bottle is then positioned and shaped using a large press. This ensures that the size of the bottle meets the requirements of the process drawings.

• Necking: The neck of the outer bottle is then formed using a machine. This is done by squeezing the top of the bottle to create a narrow neck.

  

  Necking in Stainless Steel Thermos Manufacturing

• Thread Rolling: Threads are rolled onto the neck of the outer bottle using a special threading machine. This allows the bottle to be screwed onto a lid or other accessory.

  

  Thread Rolling in Stainless Steel Thermos Manufacturing

• Flat Mouth and Bottom: The mouth and bottom of the outer bottle are then cut to the desired size. This is done using a saw or other cutting tool.

• Ultrasonic Cleaning: The outer bottle is then ultrasonically cleaned to remove any dirt or debris. This is done to ensure that the bottle is free of contaminants that could affect the quality of the drink.

  

  Ultrasonic Cleaning in Stainless Steel Thermos Manufacturing

Assembly (Bottle Mouth Matching)

• Inner Bottle Assembly: The inner bottle is typically formed by cutting a stainless steel tube to the desired length and then rolling the ends into threads. This allows the bottle to be screwed onto the outer bottle.

  

  Inner Bottle Assembly in Stainless Steel Thermos Manufacturing

• Outer Bottle Assembly: The outer bottle is then assembled to the inner bottle using a press. This is done to ensure that the two bottles are securely joined.

  

  Outer Bottle Assembly in Stainless Steel Thermos Manufacturing

• Bottom Assembly: The bottom of the outer bottle is then assembled to the bottle using a press. This is done to ensure that the bottle is watertight.

• Welding: The outer bottle and the bottom of the bottle are then welded together using a special welding machine. This is done to create a strong and durable joint.

   

   

  Welding in Stainless Steel Thermos Manufacturing

Quality Assurance Testing

• Water Leakage Test: The welded joint is tested for leaks by filling the bottle with water and then applying pressure. If there are any leaks, the bottle is rejected.
• Vacuum Testing: The vacuum between the inner bottle and the outer bottle is tested to ensure that it is adequate. If the vacuum is not adequate, the bottle will not function properly.
• Torque Testing: The torque of the threads on the neck of the bottle is tested to ensure that they are secure.
• Drop Test: The bottle is dropped to test its durability.

Additional Processing

• Mechanical Polishing: The outer bottle is then polished to a smooth finish. This is done to improve the appearance of the bottle and to make it easier to clean.

• Temperature Testing: The bottle is filled with hot water and then allowed to cool. The temperature of the bottle is then measured to ensure that it is not transferring heat to the outside. This is done to ensure that the bottle meets the manufacturer’s specifications.

• External Coating: The bottle is then coated with a protective coating, such as powder coating or spray paint. This coating helps to protect the bottle from scratches and corrosion.

• Logo Printing: The logo of the manufacturer is then printed on the bottle. This is done to identify the bottle and to promote