Brow molded container and process for molding the same

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 1/02 (2006.01) B29C 49/48 (2006.01)

Patent

CA 2717029

A thermal effect from a bottom cutoff portion of parison is dispersed and reduced by forming at least three pinch-off lines in an outer surface of a bottom and laying out these pinch-off lines radially from a center of the bottom of a bottle-like direct blow molded product made of a synthetic resin. This layout could prevent a deeply dented portion from developing in an inner bottom surface under the thermal effect from this cutoff portion of the parison. In the case of a square body, four pinch-off lines are disposed in the shape of a cross and are positioned along diagonal lines on the bottom surface. In addition, one of the diagonal lines is located on the parting line. Each outermost end of the pinch-off line is placed near bottom foot where parison walls are locally drawn and molded. Thus, the rate of drawing is reduced at the foot to prevent the walls from getting extremely thin. In one embodiment, each ridge of the square body is formed in an identical helical shape, and the parting line is made to run along a pair of ridges that are diagonally opposed to each other. Because of this design, the parting line would not impair the outer appearance of the body.

L'invention porte sur un article en résine synthétique en forme de bouteille moulé par soufflage direct, qui inhibe les apparitions de bosses sur le centre de la surface inférieure, provoquées par de la chaleur à partir des parties de coupure de paraison, par disposition radiale de trois ou plusieurs lignes de coupure qui sont laissées formées sur la surface inférieure de l'article. Également, dans le cas d'un article en forme de prisme rectangulaire, un amincissement extrême du matériau est empêché par réduction de l'ampleur d'étirement dans les pieds. Ceci est obtenu grâce à la disposition de quatre lignes de coupure en croix sur les diagonales de la surface inférieure, l'une des lignes en diagonale étant positionnée sur une ligne de séparation, et à la disposition des extrémités de chaque ligne de coupure de telle sorte qu'elles sont à proximité étroite des pieds de la partie inférieure, qui sont formées par moulage par étirement partiel. De plus, chaque ligne de bord du corps est formée sous le même motif en spirale, et, parmi les quatre lignes de bord, une ligne de séparation est disposée sur deux des lignes de bord. La ligne de séparation permet par conséquent de maintenir l'aspect extérieur du corps.

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