| 摘要 |
Longitudinal extensions of the outer panel of a double-walled insert closure box form tabs to opposite sides of an open-ended tubular sleeve of a rectangular cross-section having opposed longitudinal spaced end walls within which rectangular, parallelepiped, hollow insert closure boxes are inserted. Narrow elongated slots within the sleeve end walls and the box end walls extending parallel to the outer panel, insertably receive an integral lug at the terminal end of the tabs. The lugs have laterally opposed projections forming a barb of a width in excess of the length of the elongated slots to frictionally lock the insert closure box to the tubular sleeve when the extensions are bent at right angles to the outer panel and the lugs bent at right angles thereto and passed through the aligned slots. Insert closure boxes at respective ends of the tubular sleeve, are preferably formed of folded cardboard sheet material precut as a single box blank from a sheet of cardboard. The open-ended tubular sleeve may be formed transparent flexible plastic sheet material.
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