TH11044A - Collapsible plastic bottles? Molds for producing collapsible plastic bottles? And how to reduce the volume of collapsible plastic bottles when empty? - Google Patents

Abstract

The bottle is made of thin-walled plastic by the lead blowing process. The bottom (3) is first formed with an inward protrusion (13) which in cross-section is almost V-shaped and defines the fold (8) located on the inner bottom protrusion. The fold (8) meets smoothly with the longitudinal folds (15, 15 a, 15 b) that protrude along the length of the bottle. The inner fold (8) and the longitudinal fold lie in the same plane. This plane is perpendicular to the seam (9) formed by the lead blowing of the bottle. In the lead blowing die, the cross-section of the bottle may be a circle, rectangle, or hexagon and it is one piece with the spout, which should protrude with a smaller diameter than the top of the bottle so that as the bottle folds along the seam and all the air is expelled from inside, the bottle can be compressed and reduced in size after the airtight spout is sealed.

Claims (12)

1. A plastic bottle formed by the flow molding of a folded shape consists of a body with an outer wall (2), a bottom (3, 3 a, 3 b); and a top (16,26) with a spout (16) and a pouring protrusion (19), where, according to this invention, the bottom (3) is formed by an inward projection which, in cross-section, is an inverted projection (13) that folds almost into the shape of an inverted V, defined as the inner bottom fold (3, 8a, 8b), the length of which is at the apex of the V. The body with an outer wall (2) is formed by two seams (9) that extend along the length of the bottle and are formed by the flow molding of the bottle, where the bottom fold meets the longitudinal fold. 2. The bottle according to claim 1, where the projection (13) is an inward V-shaped projection formed from two convex walls (13, 18 a, 18b) that form part of the bottom (3, 3 a, 3b) and has a rounded region (14, 14 a, 14 b) at its end, where this rounded region (14 a, 14b) meets the outer wall (2). 3. The bottle according to claim 1, where the long internal bottom fold consists of a slight or rather linear arc in the center and two lateral arcs (10, 10a, 10b) which extend upward to meet the longitudinal fold (15, 15 a, 15 b) and meet smoothly; and where a continuation fold (17, 17 a, 17 b), which is rather inverted Y-shaped, extends downward from each longitudinal fold (15, 15 a, 15 b) to the inferior surface (4, 4 a, 4 b) of the bottom section (3, 3 a, 3 b) of the bottle. 4. The bottle according to claim 1, where in cross-section the shape of the bottle in the central region is generally a hexagon with two main surfaces (11) and four surfaces (12), where each two sides that are part of the side walls at its edges are defined as such longitudinal folds (15), such surfaces (12) form an angle (B) with each other, and where such bottom (3, 3 a, 3 b) consists of the bottom supporting surface (4) with a longitudinal projection (a) which is shorter than the distance (b) between the longitudinal folds (15, 15 a, 15 b) when the bottle is upright and filled with a substance that tends to separate the bottle from each other. 5. The bottle according to claim 1, where the body has an outer wall (2) as shown in cross-section as being somewhat rectangular, and where the longitudinal folds (15 a) are formed first and protrude from the bottle. 6. The bottle according to claim 1, where the body of the bottle in cross-section is rather circular and where the fold (15 b) elsewhere along the length protrudes and is pre-formed. 7. A bottle according to claim 1 where the seam (9) on the outer wall (2) is formed by the lead of the bottle, extending along the length of the bottle, perpendicular to the said inner bottom fold (8), and at least approximately midway between the longitudinally extending folds (15, 15 a, 15 b). 8. The bottle according to claim 1, where the body, the bottom, and the top form a single unit; the longitudinal folds (15, 15 a, 15 b) meet the top and form a rounded fold; and where the saddle-shaped part is positioned perpendicular to the plane passing through the bottom and the longitudinal folds. 9. The bottle according to claim 1, where the spout is connected to the central axis of the bottle and is formed to have an external thread (5) and has a cylindrical protruding spout (19) on one side, with a smaller diameter. 10. A bottle according to claim 9 where the smaller diameter shall be less than 1/4 and may be chosen to be approximately 1/6 of the largest dimension (b) of the bottle measured from one longitudinal fold (15) to another and measured transversely to the longitudinal axis of the bottle. 11. A two-part lead die for the production of bottles by lead. As claimed in claim 7, the two-part lead die is joined at the joint surface (29), and when the bottle is led, it forms the seam (9) mentioned. The two-part lead die, by its presence, has grooves which are longitudinal grooves (151) which, when the bottle is led, form the longitudinal folds mentioned. 12. The method for reducing the volume of bottles produced from folded lead, as claimed in claim 1, consists of the following steps: open the inside of the bottle to the surrounding air; press the bottom, body, and top sections of the bottle together to form a two-layer structure; flatten the bottom section with an inward V-shaped projection (13) between the side walls of the bottom section; the longitudinal folds (15, 15 a, 15 b) form the lateral ends of the bottle; fold the body section on the same side as the lateral ends of the bottle; fold the body section on the same side as the top section to form a semicircular or semi-cup-shaped section (30); and close the spout (16, 19) to prevent the entry of surrounding air after folding and to prevent the elastic extension of the bottom and body sections due to the elastic recovery of the bottle material (Clause 12, page 4, figure 13).