Heat-insulating container and apparatus for producing the same
A heat-insulating container is used for an instant dried food and is excellent in heat-insulating property, design and economy. The container comprises a paper cup body with a bottom, which has an inner surface coated with a polyolefin resin and is provided with an outward curled portion formed at an upper opening end of the cup body and at least one horizontal rib formed on a side wall of the cup body so as to project outward therefrom; and an inverse-frustoconical paper sleeve provided with an inward curled portion formed at a lower end of the sleeve. The cup body and the sleeve are integrally combined with each other so that an upper end of the sleeve is joined to an outer periphery of the side wall of the cup body, which is adjacent to the outward curled portion of the cup body, and an inner surface of the inward curled portion of the sleeve is joined to an outer periphery of a lower portion of the side wall of the cup body.
1. A rib-processing apparatus for processing a rib on a side wall of a paper cup body so as to extend in a circumferential direction of the side wall comprising:
male and female model members disposed opposite to each other with the side wall therebetween, the male model member being provided on a portion facing the female model member with a projection to form a concave side of the rib, and the female model member being provided on a portion facing the male model member with a groove to form a convex side of the rib, one of the mare and female members being provided on a cup holder and being rotatable together with the cup holder, the cup holder being capable of rotating about an axis thereof vertically extending and insertable near to a bottom of the cup body within the paper cup body to support the cup body from an inside thereof, the other of the male and female members being a press roller disposed outside of the cup body;
a radial direction driving device for moving at least one of the male and the female model members in a radial direction of the cup body so as to allow the male and the female model members to close together and open away from each other;
a circumferential direction driving device for making a relative rotation between the cup body and the press roller rotatable about an axis parallel to an axis of the paper cup body to change a position at which the side wall is nipped between the male and the female model members in the circumferential direction; and
a restraining device, for restraining the paper cup body, provided over the cup holder;
wherein the press roller has tapered outer circumferential surface inclining along the side wall of the cup body.
2. A rib-processing apparatus according to claim 1 , wherein the radial direction driving device moves said other one of the male and the female model members in the radial direction of the cup body, and the circumferential direction driving device rotates the cup holder.
3. A rib-processing apparatus according to claim 2 , wherein said one of the male and the female model members provided on the cup body extends continuously over an entire periphery of the side wall of the cup body.
4. A rib-processing apparatus according to claim 1 , wherein the male model member is provided inside the cup body, and the female model member is provided outside the cup body.
5. A rib processing apparatus according to claim 1 , wherein one of the male and female members has a plurality of flanges to form a plurality of ribs.
6. A rib processing apparatus according to claim 5 , further comprising a conveyor for conveying the cup holder through a plurality of processes, wherein a rotary driving mechanism for rotating the cup holder and the press roller are provided intermediate positions of a conveying path of the conveyor.
7. A rib processing apparatus according to claim 1 , wherein a groove is formed on the outer circumferential surface of the press roller, and the male member is opposed to the groove of the press roller is provided on the cup holder.