Process and apparatus for testing the tightness of seam joints of synthetic resin sheets by means of vacuum
AssigneeDynamit Nobel Aktiengesellschaft
InventorFriedrich Kops
Life of this patent
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Abstract
An apparatus for testing the strength and/or the leakproofness of seams or joints formed between synthetic resin sheets comprising a semicylindrical shell of transparent material having rounded closed-in portions and forming with its peripheral edges, sealing strip means surrounding said opening a continuous frame for engaging said strip means and a flexible closure means operatively associated with said frame for sealing off the opening whereby a test chamber is formed and pump means connected to said chamber for applying a vacuum thereto.
Claims9
An apparatus for testing the leakproofness of seam joints of synthetic resin sheets by a vacuum produced by a pump means in a testing chamber, which comprises a semi-cylindrical shell of a transparent material having rounded corners in the form of quarter spheres, said shell forming an opening at its underside, sealing strip means surrounding said opening, a continuous frame for engaging said strip means and a flexible closure means secured to said frame fro sealing off the opening by contacting the synthetic resin sheets whereby a test chamber is formed with said apparatus over a portion of the seam joint to be tested.
A process for testing the tightness of a seam joint of elastic synthetic resin sheets which comprises applying a thixotropically adjusted and dark-colored liquid or paste to the seam joint of the resin sheets to be tested, placing the joint seam of resin sheets to be tested under and in sealed contact with a semi-cylindrical shell forming a test chamber above said seam joint, applying a vacuum to said test chamber to cause said seam joint and said resin sheets to bulge upwardly in said test chamber, producing control bubbles at leaky locations in said seam joint and providing clearly visible markings on the resin sheets around the leaky locations upon bursting of the bubbles of said liquid or paste whereby said leaky locations can be determined.
Dependencies are inferred from the claim text.