Freestanding plastic container for pressurized fluids

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 1/02 (2006.01)

Patent

CA 2117800

A freestanding container base having an improved combination of properties in regard to creep resistance, stress crack resistance, impact strength, weight, standing stability and formability. The container base (18) has a substantially hemispherical bottom wall (21) which includes four radiating ribs (26), and four legs (22) extending downwardkly from the bottom wall between the ribs and each of which terminates in a foot (24). Each rib has a rib wall forming part of the substantially hemispherical bottom wall and having an angular extent of from about 15° to about 30° for enhanced strength, with the leg occupying the remaining 75° to 60° angular extent for enhanced formability. The outer edge and angular extent of the foot are predetermined for enhanced stability and ease of formability. Preferably, the creep resistance is further enhanced by straightening the upper rib portion or providing an enlarged-diameter truncated bottom wall. The base is particularly suited for a blown PET carbonated beverage bottle.

L'invention concerne un base de contenant autoportant offrant des propriétés améliorées de résistance au fluage, de résistance à la fissuration sous contrainte, de résistance au choc, de poids, de stabilité en position debout et de formabilité. La base du contenant (18) comprend une paroi inférieure (21) relativement hémisphérique qui est dotée de quatre nervures (26) et de quatre pattes (22) s'étendant vers le bas depuis la paroi entre les nervures et comportant chacune un pied (24). Chaque nervure comporte une paroi faisant partie de la paroi inférieure hémisphérique et ayant une extension angulaire comprise entre environ 15 degrés et environ 30 degrés pour renforcer la résistance, la patte occupant les 75 à 60 degrés restants pour renforcer la formabilité. Le bord extérieur et l'angle de la patte sont prédéterminés pour renforcer la stabilité et faciliter la formabilité. La résistance au fluage est préférablement renforcée davantage par redressement de la partie supérieure de la nervure ou par la mise en place d'une paroi inférieure tronquée à diamètre élargi. La base convient particulièrement pour une bouteille de boisson gazéifiée en PET soufflé.

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