Pull ring cutting mark sealing performance detection method of pull ring type combined cover

Abstract

The invention discloses a pull ring cutting mark sealing performance detection method of a pull ring type combined cover. An external cover is arranged in a special fixture; a sealing ring of which the diameter is equal to the diameter of an external cover welded sealed surface is embedded into the fixture located at one side of the bottom end of the external cover, and the fixture is tightened; one end of the air pipe of an air compressor is aligned with the inner cavity of the external cover, and an air valve is opened, a gas of which the pressure intensity is 3Kpa is injected into the inner cavity of the external cover; the fixture is arranged in water for 1 minute, and whether bubble leakage occurs is checked; and when no leakage occurs, the outer cover is judged as a qualified product. According to the sampling of the invention, products generated from each cavity of a corresponding series number of each mould are adopted, and the products are detected by using the above method. The detection method of the invention has the advantages of simple operation and reasonable steps. Air tightness detection is performed twice, so that a rate of finished products can achieve 100%. With the method adopted, the problems of proneness to mildewing of infusion bottles or bags and economic losses of users which are caused by a condition that the infusion bottles or bags of which the pull ring cutting marks are broken and cause leakage are stored for a long time can be solved.

Description

technical field [0001] The invention relates to a method for detecting the airtightness of the cut marks of the pull ring of a pull ring type combined cover. Background technique [0002] Polypropylene combined caps (ring-pull type) for plastic infusion containers are implemented in the standard YBB00242004-2015 "Part 1 Outer Cover" test item, which stipulates the test method for the tightness of the ring-pull cuts: "Take ten pieces of this product and put them under high pressure. Heat to 121°C±2°C in a steam sterilizer, keep for 30 minutes, cool to room temperature, fill with penetrant (65% ethanol: 10g / L methylene blue solution 100:5) to 2 / 3 height, place Keep it on the filter paper for 60 minutes, and there should be no leakage at the cut. [0003] In order to ensure that the cut of the pull ring of the combination cover does not leak, it is not possible to thicken the cut of the pull ring arbitrarily, because the standard stipulates that the opening force of the pull r...

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned problems, the present invention aims to provide a method for detecting the airtightness of the ring-tab cut of the ring-tab combination cover. High efficiency, which solves the problem that in the prior art, once the infusion bottle (bag) breaks at the cut mark of the pull ring, it is prone to mildew and causes economic losses to product users when stored for a long time

Images