Aerosol workers can use a contact height meter to measure the contact height of an aerosol can. What is the contact height of an aerosol can? In "GB 13042-2008 Packaging Container Iron Aerosol Can" and "GB/T 25164-2010 Packaging Container 25.4mm Diameter Aluminum Aerosol Can", it is stipulated that the contact height of a 25.4mm diameter iron aerosol can is 4.00 ± 0.15mm, and the contact height of an aluminum aerosol can is 4.25 ± 0.20mm.
In BB/T 0005-2010 Labeling, Classification and Terminology of Aerosol Products, 5.3.7 Contact Height is described as follows: The distance from the corresponding position of the rear curling edge of the aerosol can to the plane of the can mouth:
In the book "Aerosol Theory and Technology", 2010 edition, the "Definition of Contact Height" on page 141 is described as follows: The contact height H refers to the distance between the top plane of the can mouth curling edge and the center of the curvature radius of the sealing claw (when it is at the sealing diameter):
Every time I see these, they are quite vague. Let's first look at the two data in the figure in BB/T 0005-2010, 0.35 and 3.00 (both units are mm).
Combined with another picture in the book "Aerosol Theory and Technology", 0.35mm is the vertical distance from the center point of the radius of the sealing claw (this radius is the sum of the radius of the machine claw head + the thickness of the valve sealing cup) to the vertical tangent inside the can mouth when it appears at the theoretically suitable sealing point, and the middle refers to the vertical distance from the center point of the radius of the measuring body of the contact height gauge to the vertical tangent inside the can mouth. In other words, the thickness of the sealing cup has been considered when the diameter of the measuring body itself is set.
3.00mm refers to the diameter of the measuring body of the contact height gauge. The contact height is the vertical distance from the point to the surface.
Point: The center point of the curvature radius of the sealing claw when the theoretical sealing condition is suitable. Surface: The top plane of the can mouth curling
*The contact height refers to the vertical distance from the center point of the curvature radius of the sealing claw to the top plane of the can mouth curling when it is in the theoretically suitable sealing condition.
