Air bag type testing fixture for air tightness of paper bag

Abstract

The invention discloses an air bag type testing fixture for air tightness of a paper bag. The testing fixture comprises an air bag, an air pipe, and rigid plates. The air bag is in a cuboid shape in an unfolded state, and the vertical projection contour of the air bag in the unfolded state is matched with the opening contour of the paper bag; the air pipe comprises an air inlet pipe penetrating through the air bag; when the air bag is plugged into the paper bag, the two ends of the air inlet pipe comprise first air inlets located outside the paper bag and first air outlets located in the paperbag, the air inlet pipe is further provided with inner air outlets located in the air bag, the inner air outlets are connected with first air valves, and the first air outlets are connected with second air valves. The first air inlets are connected with an air compressor, a first air valve and a second air valve are self-operated pressure control valves, the first air valve and the second air valve are a two-way valve and a one-way valve respectively, and the pressure required for opening the second air valve is larger than that of the first air valve; the rigid plates are attached to the topof the air bag, and the two rigid plates are arranged on the two sides of the air inlet pipe in a mirroring mode. The testing fixture can detect the air tightness of the paper bag, is low in equipment cost, and is quick in paper bag feeding and discharging.

Description

technical field [0001] The invention relates to the field of paper bag inspection tools, in particular to an airbag-type inspection tool aimed at the airtightness of paper bags. Background technique [0002] Portable shopping paper bags are a common container in major business circles, especially widely used in the clothing consumption industry. Today's shopping paper bags are often simple and uniform in structure, and they are in the shape of a cuboid with an open top after being stretched. The whole paper bag is generally formed by folding and bonding one side of flat paper. The bottom of the paper bag often has multiple overlapping bonding areas. It is necessary to control the bonding quality. If the bonding area that should be bonded is not fully covered, it will cause The phenomenon that the connection strength does not reach the design state, which in turn affects the overall carrying capacity of the paper bag. But the bonding area is often between two layers of pape...

AI Technical Summary

Problems solved by technology

The whole paper bag is generally formed by folding and bonding one side of flat paper. The bottom of the paper bag often has multiple overlapping bonding areas. It is necessary to control the bonding quality. If the bonding area that should be bonded is not fully covered, it will cause The phenomenon that the connection strength does not reach the design state, which in turn affects the overall carrying capacity of the paper bag

However, the bonded area is often between two layers of paper, making it difficult to visually inspect

The glue is generally transparent, and it is impossible to check whether the glue is fully bonded by light through the paper bag.

Images