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Pasted-Valve (PV) Bags

This is completely fabricated in the sack factory with an opening or valve in one corner through which the sack is filled. The valve is made with an inner flap which functions as a self-closing check valve after filling. It is available with a plain valve or with an extended inner sleeve of paper or film.  If an extended "tuck-in sleeve" is used, the sleeve is manually folded down and back into the pocket under the sleeve for positive closure against sifting. Sleeves that are thermoplastic-coated may be heat-sealed.