HU204011B - Injection-moulded one-section flask - Google Patents

Abstract

A one piece self supporting blow molded plastic container (130) having a generally cylindrical side wall (138) and a plurality of hollow legs extending downwardly from the side wall. The legs terminate in substantially planar feet (152) having radially outer edges (154) forming a non-continuous support surface engaging area having a diameter slightly less than the diameter of the tubular side wall. A generally horizontal center section (146) is disposed in the center of the container radially inwardly of the legs and merging with the inner edges (156) of the feet. V-shaped ribs extend radially outwardly and upwardly from said center section so as to circumferentially separate said legs.

Description

Scope of the description: 12 pages (including Figure 7)

EN 204011

SUMMARY OF THE INVENTION The present invention relates to an injection molded one-piece bottle for carbonated drinks with a tubular side wall having a given diameter and a bottom portion having a bottom wall downwardly and radially inwardly of the tubular side wall and several legs extending downwardly from said bottom wall or middle portion thereof, which are each of a bearing base. they have separate surface surfaces that are in contact with the surface and have an outer diameter of slightly less than the diameter of the tubular side wall.

The use of plastic bottles for carbonated beverages causes considerable difficulty in the strength of the bottom of the bottle. Due to the internal pressure due to the carbonic acid content, which may exceed 0.52 MPa, the plastic bottles tend to swing at the bottom. As a result, a "standing pendulum" can be formed that tilts up or down on a flat surface, or may tilt up. In addition, the volume of the bottle increases when the bottoms of the bottoms are raised, and the level of filling is lowered and therefore the consumer may believe that the bottle has not been filled. or not properly closed.

One solution to the problem of swelling is that the bottom of the bottle has a hemispherical shape and a bottom cup is attached to it, the flat bottom surface of which keeps the bottle in an upright position. This type of bottle is generally referred to as a composite bottle. Composite bottles are widely used as 0.454 kg carbonated beverage bottles. However, the use of the bottom cup increases the cost of the material and therefore began to create 3 single-piece bottles whose anterior bottom was reinforced to prevent the carbonic pressure build-up.

Several factors have to be taken into account when evaluating the bottom of the bottle. One of the most important factors is 3 stability. Apalack must be stable and empty. The empty bottle should be sufficiently stable to stand upright on the bottle filling machine. The efficiency of the filling operation can be adversely affected if the bottles are overloaded during transport. In order to maintain the stability of the bottle 41, the diameter of the receiving area of the bottle which is in contact with the horizontal substrate must be maximized. In addition, the area of the bottom part that is in contact with the substrate surface must be maximal. 4i

Another factor of evaluation is the strength of the bottom part, ie whether it is resistant to cracking - in the event of a collision with the bottle. The tension crack in the bottom reduces the strength and therefore the bottom part can easily crack. The magnitude of the crack 5C depends on the geometry of the bottom part. If there are relatively large curvature curves in the bottom part, the risk of tension cracking decreases compared to the bottom part containing the small beam curves.

An additional assessment factor is whether 55 can be properly vented in the die die casting. Adequate ventilation is required to allow the plastic to infiltrate the bottoms of each of the bottoms and to form the soles at the lower ends of the legs to determine the bottoms of the bottoms.

Various one-piece bottles have been developed. For example, it is known from DE-OS 29 20122 a circular plastic bottle, particularly produced by a spinning tool, the bottom portion of which has a convex bottom section outwardly circumferentially extending substantially tangentially into the circular cross-sectional wall. There are hollow support legs arranged in the form of a flower petal, extending downwardly from the support surface of the bottle, and diverging outward from the bottom center. The number of support legs distributed along the bottom area is five. In this solution, the objective is to reduce the occurrence of tension cracks in addition to the good endurance of the bottle.

Also known from DE-OS 3121535 is a plastic bottle having a sidewall with an oriented cylindrical bottom portion and a bottom portion connected to the side wall. The bottom comprises a substantially elliptical bottom wall and? 0 a plurality of oriented, outwardly spaced outwardly convex legs. The first section of the elliptical wall extends downwardly from the lower cylindrical side wall section and has a radius less than the diameter of the bottle. Each leg has a first orifice section 5 extending downwardly from the cylindrical section of the sidewall and having a radius greater than the diameter of the cylindrical portion of the sidewall. Each leg has divergent sidewall sections that radially inwardly pass through the elliptical wall section of the bottom wall. The purpose of this solution is to create a free-standing bottom part for pressurized plastic bottles and to improve impact resistance in the vicinity of its peaks.

EP 02 25 155 discloses an internal pressure-resistant plastic bottle containing a plurality of identical foot portions spaced out along the same circumference, separated by relatively narrow, parallel-side grooves that reach the central portion. The latter, together with the lower surfaces of the foot portions, forms a smooth D-pop-up, which is reinforced by the walls of the grooves, in the form of a smooth curvature. Here, the purpose is to create a bottom bottom of the bottle where the effective base diameter of the bottoms is only slightly smaller than the diameter of the bottle, and the gaps between the legs are so small that the conveyor conveyor cannot get caught. In order to increase the pressure resistance, the section between the parts has a protruding, i.e. outwardly concave shape. '~

However, these well-known bottles have one or more drawbacks resulting from the formation of the bottom part. The bottom of the plastic bottle is bent downwards when the bottle is filled with a liquid containing carbonic acid. If this occurs, the diameter and size of the areas associated with the substrate will be reduced for several current one-piece bottles. As a result, the stability of full bottles is reduced.

For many previous bottles, the bottom geometry is such that the soles are small and the radii of the curves are relatively small. As a result, the abutment is unstable and tension cracks that cause the bottom part to be easily impacted by impact.

EN 204011

It is an object of the present invention to provide a bottle having a larger area of contact with the surface of the bottle and a diameter greater than the diameter of the bottle, as is known in the art, to improve the stability of the filled bottles.

It is a further object of the present invention to provide a bottle in which the deflection of the bottom portion due to filling does not reduce the area associated with the bearing surface.

It is a further object of the invention to provide a bottle in which the curvature of the bends and curves is greater than that known to reduce the potential for tension cracking.

According to the present invention, the present invention relates to a bottle having radially outer edges and inner edges having flat surfaces and radially inwardly inclined upwardly, and that when the empty bottle is supported on a horizontal surface the outer edges of the soles are in contact with this surface, while the inner edges are disposed above this surface, while the internal pressures of the carbonated liquid filled into the bottle cause the soles to rotate around the outer edges and thus come in contact with the horizontal supporting surface along their entire surface.

Since the soles are inclined upward in the radially inward direction, so if the bottle is filled with a carbonic acid fluid, the pressure in the bottle rotates the soles around their outer edges to a substantially horizontal position. In the charged position, the soles have a large contact surface on the horizontal surface on which the bottle is standing. When the bottle is filled, the diameter of the areas of the bottle attached to the supporting surface is not reduced, unlike many of the prior art bottles at which this occurs. When the bottle according to the invention is filled, the outer edges of the soles remain in contact with the horizontal surface and have a bearing area whose diameter is equal to the diameter of the empty bottle.

The wall portions starting from the bottom wall of the bottom part taper slightly inwardly from the tubular side wall of the bottle. This conicity is required for the capacity of the bottle. By minimizing this conicity, the radial distance between the shaft axis and the outer edges of the soles will be maximal, and thus the diameter of the surface area will be relatively large. This improves the stability of the bottle. In addition, a bottom part having a large diameter at its lower end allows the surface of the flat surface of the soles to be larger than that of the former bottles.

Furthermore, when increasing the diameter of the supporting surface of the support surface, the radius of the curves in the bottom portion can be increased and this reduces the stress cracks in the bottom.

The invention will now be described in more detail with reference to the accompanying drawings, in which:

Figure 1 is a cross-sectional view of a bottom portion of an earlier bottle;

Figure 2 is a sectional view of the bottom of another prior bottle;

Figure 3 is a side view of a bottle according to the invention;

Figure 4 is a bottom view of the bottle of Figure 3;

Figure 5 is a sectional view taken along line 5-5 of Figure 4;

Figure 5A is an enlarged view of a portion of Figure 5;

Figure 6 is a side view of another embodiment of the bottle according to the invention;

Figure 7 is a side view of the bottle of Figure 6 with respect to Figure 6;

Figure 8 is a plan view of the bottle of Figures 6 and 7;

Figure 9 is a bottom view of the bottle of Figures 6 and 7;

Fig. 10 is a sectional view taken substantially along line 10-10 of Fig. 9.

The bottoms of the plastic bottles used so far are shown in Figures 1 and 2. The bottom portion 102 of FIG. 1 has a plurality of horizontal legs 104. The outer edges 105 of the soles 104 determine the outer edges of the D-diameter areas connected to the bottle receiving surface. In the bottom part, there is a central portion 106 between the inner edges 107 of the sole 104. The middle part 106 penetrates into the bottle to form a concave outer surface wall.

When the bottle with the bottom part 102 is filled with the carbonic acid liquid, the pressure in the bottle bends the bottom part downward so that the middle part 106 moves to the position marked by the spiral line 108. As a result, the soles 104 are generally rotated about their outer edges 105 into the position indicated by the spiral line 110. In this position, the bottle is in the area d which is connected to the supporting surface, which corresponds to the position of the inner edge 110 of the soles according to the spirit line. The diameter d is much smaller than the diameter D. This means that the stability of the filled bottle is lower.

Another type of bottom used so far is shown in Figure 2. This bottom part 112 has a horizontal base 114 and its ribs 116 cross the inner edges 118 of the base 114 to the opposite side wall of the bottle and reach the location 120. When the bottle is empty, the areas of the bottom portion of the bottom 112 that are attached to the supporting surface extend to the outer edges 122 of the base 114. However, when the bottle is filled with a carbonic acid fluid, the pressure in the bottle bends the bottom part 112 downward so that the previously straight ribs 116 are then bent downward in accordance with the spirit line 124. As a result, the soles 114 rotate generally along their outer edges 122 to the spirit line 126. In this position, the diameter of the areas of the bottom portion engaging the supporting surface only extends to the inner edges 128 of the legs 126 in the bent position. This means that the stability of the filled bottle is less than that of the empty bottle.

The plastic bottle according to the present invention has a bottom portion in which the diameter of the area connected to the supporting surface is not reduced when the bottle is filled. The plastic bottle 130, having a bottom portion according to the invention, is shown in Figure 3. THE

EN 204011

130 bottles are made of biaxially oriented, saturated polyester, preferably polyethylene terephthalate (PÉT), by injection molding having a splashed conical top 132. The upper portion 132 has a flange 134 and a threaded neck 136. The conical upper portion 132 continues downwardly in a hollow body having a tubular side wall 138. The sidewall 138 is generally cylindrical and has a central longitudinal axis 139. The lower end of the side wall 138 passes downwardly into the bottom part 140, which closes the bottom of the bottle 130.

The bottom part A140 has a downwardly extending bottom wall 142, which is best seen in cross-section in Figure 5. The bottom wall 142 bends radially inwardly from the lower end of the tubular side wall 138. As shown in FIG. 5, the radius of curvature of the bottom wall 142 is constant and radius greater than the radius of the tubular side wall 138. A relatively small radius of passage 144 connects the upper end of the bottom wall 142 with the lower end of the side wall 138. The bottom end of the bottom wall 142 ends at the central portion 146. This central portion 146 is substantially concentric with the bottom part 140 and intersects the longitudinal axis 139. The central portion 146 is generally horizontal at the center of the bottom portion 140, although it may be slightly convex or concave.

The bottom wall 142 is comprised of a plurality of downward wall portions forming hollow legs. These legs extend radially from the central portion 146 and extend under the bottom wall 142. These wall portions consist of the side wall portions 148 of the legs and the outer wall portions 150 of the legs, as shown in Figure 3. The outer wall portions 150 of the legs form radially outer surfaces of the hollow legs. As shown in Figures 3 and 5, the radius of curvature of the outer wall portions 150 of the legs is constant and radially inward, downward. The side wall portions 148 of the legs extend downwardly from the bottom wall 142 and from the outer wall portions 150 of the legs. The legs end in the soles 152. Fig. 5A is an enlarged view of the sole according to Fig. 10. Each of the base feet 152 is generally trapezoidal, as shown in FIG. The outer 154 edges of the soles are generally parallel to the inner edge 156. The side edges 155 of the soles152 hold radially inwardly. Between the hollow legs, the peripheral wall 142 on the circumference forms inverted V-shaped ribs that separate the hollow legs.

Each foot 152 defines a flat surface that is inclined radially inwardly and upwardly so that the outer edge 154 of each sole is lower than the inner edge 156 of the soles. The outer edges 154 of the soles are at the lower edges of the outer wall portions 150 of the legs and are connected thereto by a relatively small radius 158. The outer edges 154 of the soles 152 form the area of the bottle 130 which is connected to the supporting surface, the diameter of which is barely smaller than the diameter of the side wall 138. By minimizing the outer edges of the soles 152, the stability of the bottle is improved.

When the bottle 130 is filled with a carbonated beverage, the pressure in the bottle 130 causes the central portion 146 to bend downward to the position indicated by the dashed line 160 in FIG. Due to this downward movement of the central portion 146, the soles 152 are also moved downwardly, generally turning around the outer edges 154 to the position indicated by the line 162. In this rotating position, the soles 152 contact the surface surface horizontally 163 on which the bottle 130 rests. The outer edges of the bonded surfaces remain in position 154, and thus the diameter of the areas connected to the supporting surface is not reduced as a result of the deflection of the central portion 146, so its stability is not reduced when the bottle is filled.

The angle of inclination 157 of the base 152 relative to the horizontal support surface 163 depends on the size of the bottle and the wall thickness of the bottom 140 material. These two factors determine the extent to which the bottom 140 is bent by the internal pressure. It has been found that an angle of about 9 ° is sufficient for most two-liter and one-pound (0.454 kg) bottles.

The surface contact of the soles 162 with the surface 163 not only maintains the stability of the bottom when it is bent, but also reduces the tilting of the bottle 130. The vertical bottle 130, in the event of a tilt, strives to turn back, then back there, and so on, if it is not decided to roll over so much. This tilt may diminish and the bottle 130 will come to rest. If the soles 162 are in contact with the supporting surface, the damping is greater than when the bottle 130 is empty and lies along the outer edges 154 of the inclined base 152.

Another embodiment of the invention is shown in FIGS. Figure 1B. Here, the injection molded plastic bottle 10 has a splashed conical upper portion 13 having a crimp 12 and a thread 18. The bottle 10 further has a hollow, tubular side wall 14 and a splashed bottom 16.

The bottom part 16, as shown in Figure 10, has a bottom wall downwardly facing the side wall 14, which comprises the upper part 20 and the lower part 30. The lower part 30 is curved radially inwards and downwards. The bottom wall ends in the middle portion 28, which is substantially concentric with the bottom part 16.

The bottom wall is formed by a plurality of downward wall portions forming hollow legs 26 extending under the white wall. These wall portions consist of the side wall portions 32 of the legs and the outer wall portions 33 of the legs. The outer wall portions 33 of the legs form radially outer surfaces of the hollow legs. As can be seen in Figure 10, the outer faces 33 of the legs are uniformly radially inward and downwardly tapered. The legs, as shown in Figure 10, end in a flat foot 25 which passes through the middle portion 28. The soles 25 are inclined radially inwards and upwards, as shown by the dashed line. This line indicates the position of the 25 feet when the bottle is empty. The soles occupy the position indicated by the continuous line 27 when the bottle 10 is filled with a carbonated beverage. When the bottle 10 is filled, the soles 25 generally rotate around their outer edges 24 to a position 27. In this position, the soles are surface contact with the horizontal surface 29.

The soles in both embodiments of the invention are positioned radially as far as possible outwards. Thus, the soles have a relatively large surface surface4

There are needles that form areas of attachment to the supporting surface. The outer wall portions of the legs are tapered or curved inwards, making it easier to remove the bottle from the tool. This conicity or curvature is as small as possible, and thus is not continuous with the outer edges of the soles, the diameter of the area attached to the supporting surface is only slightly less than the diameter of the tubular side wall of the bottle. This arrangement also allows the curves of the curved parts to be relatively large in the bottom relative to many well-known bottles. It reduces or eliminates tension! possibility of cracking in the bottom. It has been found that in the case of both two-liter and single-bottle bottles, five soles are the optimum for the soles to be larger and the curves of the curved parts to be larger in the bottom.

Bottles A10 and 130 are injection molded in a conventional manner from a molded, preformed plastic. The preformed plastic is heated to a temperature at which it can be injection molded and then inserted into the cavity of the tool, the inner surface of which corresponds to the desired shape of the bottle. Compressed air is introduced into the preformed plastic to come into contact with the inside surface of the die cavity. The air in the cavity is drawn through the ventilation openings at the lower end of the die cavity to allow the plastic to be completely blown into the base of the bottom of the cavity. These vent openings are narrow gaps in the tool cavity which form narrow but noticeable lines on the surface of the bottle. These lines are indicated by Figure 172, Figure 34, Figure 34, Figure 6 and Figure 7 in Figure 4.

The hollow legs are formed by blowing down the bottom wall plastic material down from the bottom wall. The legs end up in substantially flat areas that are connected to the supporting surface and blown out of the bottom wall.

The oblique connecting areas rotate as a result of the internal pressure in the bottle and form monolithic surfaces that engage on the horizontal surface for the bottle.

The one-piece injection molded bottle according to the invention has a bearing bottom portion. The bottom part has a bottom wall which starts from the lower end of the side wall of the bottle. There are several feet down from the bottom wall that form hollow legs with flat soles. The soles are inclined upwards and inwards, starting from the outer edges of the legs. The internal pressure in the bottle filled with the carbonated beverage pushes the bottom of the bottom part downward, the soles turning in a horizontal position, and thus forming one-plane bearing surfaces on which the bottle stands. This deflection does not reduce the diameter of the bottle receiving surfaces, and thus the filling stability of the bottle is not reduced. In addition, there are curved portions of relatively large radius in the bottom of the bottle. This reduces tension! cracks in the bottom, thereby increasing the strength of the bottom and reducing the possibility of cracking.

It will be appreciated that the scope of the invention is not limited to the specific design or method described herein. These can be altered and modified without departing from the spirit and scope of the invention as stated in the claims.

Claims (9)

PATENT CLAIMS 1. An injection-molded bottle for carbonated beverages having a tubular sidewall of a certain diameter and a bottom having a bottom wall extending downward from the tubular sidewall and radially inward, and extending from the bottom to the bottom, forming separate support surfaces, the outer diameter of which is slightly less than the diameter of the tubular side wall, characterized in that the soles (25) having radially outer edges (24, 154) and inner edges (156) are flat. and in that they extend radially inwardly upwardly, furthermore, when the empty bottle (10) rests on a horizontal surface (29), the outer edges (24, 154) of the soles (25) are in contact with this surface (29), 156) are located above this surface (29) while they are filled into the bottle (10) When the internal pressure of the carbonated liquid t occurs, the soles (25) are pivoted about their entire surface and are in contact with the horizontal abutting surface (29). Bottle according to claim 1, characterized in that the hollow legs (26) formed in the bottom portion (16) have an outer wall portion (33) extending from the tubular side wall (14) to the outer edges (25) of the soles (25). 24) passes through and downwardly tapers evenly, radially inward. Bottle according to Claim 1, characterized in that in the bottom part (16) the hollow legs have an outer wall part (33) extending from the tubular side wall (14) and extending to the outer edges (24) of the soles (25). they also have a curved wall portion of constant radius curved inward, downward from the side wall (14). Bottle according to claim 1, characterized in that in the bottom part (16) the bottom wall has a substantially horizontal middle part (28) in the middle of the bottom part (16) and this middle part (28) radially outward from the center of the bottom part (16). and passing downwardly into the inner edges of the soles (25). Bottle according to claim 1, characterized in that the bottom wall (16) has a curved shape. A bottle according to claim 5, characterized in that the bottom wall (16) has a constant radius, arc-shaped portion. Bottle according to claim 1, characterized in that the legs (150) in the bottom part (140) extend downwardly from the tubular side wall (138) and pass through the outer edges (154) of the soles (152) and formed by two side wall portions (148) facing downwardly from the bottom wall (142) and inwardly from the outer wall portions (150), and that the sidewall portions (148) of the adjacent legs and the bottom wall (142) form inverted V-shaped ribs; . Bottle according to claim 1, characterized in that the soles in the bottom part are trapezoidal. A bottle according to claim 1, characterized in that the bottom part has five legs.