FR2929599A1 - Rigid plastic package i.e. bottle, for e.g. cleaning product, has resisting unit e.g. pin, laterally placed with respect to ring for resisting axial compression on preform, where package is formed by injection blow molding - Google Patents

Abstract

The package (1) has a resisting unit e.g. pins (7), laterally placed with respect to a ring (3) for resisting axial compression on a preform during opening and closing of the package. The pin connects the ring and a body (2), where the package is formed by injection blow molding. The body serves as a recipient or container for receiving contents. The pins placed in a parting plane or perpendicular to the parting plane or coaxial with respect to the ring. Obliteration unit (6) e.g. cap, connected or integrated to the package. An independent claim is also included for a method for forming a plastic rigid package.

Description

PLASTIC RIGID PACKAGING AND METHOD OF OBTAINING THE SAME

The present invention relates to a packaging and / or packaging for applications such as cosmetics, pharmacy, or food but also all types of industries using packaging in their manufacturing process.

More specifically, the present invention relates to a rigid package, made of plastic, manufactured by injection blow molding.

Due to the reduction of plastic waste, environmental constraints and packaging trends, which are influenced by marketing, packaging and corks have reduced dimensions.

In the case of an obliteration of a bottle by a capsule, for example, it is necessary to apply a vertical force, with respect to the central axis 20 of said bottle, to close said capsule. The bottle must then be designed to withstand some compression due to the opening and closing of the obliterating means to prevent collapse of the neck of said bottle.

It is known to make bottles having shapes, or their constitution itself, favoring good mechanical resistance to axial compression. However, they no longer meet the current requirements.

According to European Patent Application No. EP 1488911, there is disclosed a method of injection-stretch blow molding for forming a narrow neck cylindrical container having the following steps: injection molding of a preform having a portion body integrally molded with a neck portion where the body portion is formed with a wall thickness, and - stretch blow molding the preform on the container into a blow mold cavity, wherein a body portion of the container is formed with a thin wall.

This known method does not make it possible to overcome the problem of mechanical resistance to any compression applied to the neck of a container having narrow neck dimensions.

The present invention overcomes the disadvantages of the prior art in 1s proposing a device resistant to compression due to the openings and closures of the obliterating means.

In addition, the present invention can significantly reduce the costs of the raw materials used as well as improve the environmental impact.

The present invention therefore consists in a rigid plastic packaging produced via injection-blow molding, formed of a body and a ring, characterized in that it comprises at least one means of resistance to axial compression. disposed laterally with respect to said ring.

Said body according to the invention may comprise a counter-ring and / or a neck.

More specifically, said resistance means is a projecting element, lug, appendage or reinforcement of parallelepipedal shape joining said ring and said body.

More precisely said lug is disposed in the joint plane, substantially perpendicular to the joint plane or coaxially with respect to said ring.

The invention also relates to a process for obtaining a rigid ~ o plastic package formed of a body and a ring comprising the following steps: i. injection and molding of a preform from granules of selected material; ii. blowing said preform into a blow mold, held by a ring mold; iii. ejection of the packaging thus obtained; wherein it is provided a molding, blowing and ejection of at least one axial compression resistance means disposed laterally with respect to said ring. Alternatively, said method comprises a step of reheating and / or conditioning between steps i) and ii).

Alternatively, said method comprises a stretching step between zs steps i) and ii) or parallel to step ii).

Advantageously, steps i) and ii) are performed sequentially on the same machine.

Advantageously, the injection-molding step of said strength means is carried out partially or totally in the ring mold.

In addition, the blowing step is performed via a ring mold or a blow mold.

More specifically, said blow mold comprises a negative form forming a counter-ring and / or a neck and / or notches.

The invention will be better understood in the light of the description which follows, relating to illustrative and in no way limiting examples of the present invention, with reference to the attached drawings, in which: FIG. 1 is a schematic diagram of the general method of manufacturing the device according to the invention; Figures 2 and 3 are partial and perspective views of the upper portion of the present invention; Figures 4 and 5 are partial diagrams in cross section of the upper part of said device; FIGS. 6 and 7 are schematic illustrations of the molding steps of the device according to the invention; - Figures 8 and 9 are schematic illustrations of the blowing steps of the device according to the invention; FIG. 10 is a partial perspective diagram showing another mode of configuration according to the invention; FIG. 11 represents a blow mold viewed in perspective from the device according to the invention.

The present invention relates to a rigid plastic packaging and its method of obtaining by injection-blowing. More specifically, said manufacturing method may comprise a step of conditioning a preform included in a cold-cycle injection-blow molding process, that is to say that the preform is molded beforehand on an injection molding machine. and then reheated only when used to be formed on another machine; or - hot cycle, that is to say that the preform once molded is directly used to undergo its forming on the same machine;

Preferably, the injection-blowing is carried out in a hot cycle. That is to say, it leads to the formation of a preform, without the need to repackage in order to make it directly blow with or without bi-orientation.

Alternatively, it is possible to provide the injection-blowing step in a cold cycle.

Figure 1 is a schematic diagram of the general method of manufacturing the device according to the invention. For example, in Figure 1, granules of one or more desired materials are premixed in a hopper. Then, the steps are as follows: injection-molding and blowing of a preform in a hot cycle, where the injection of the preform and its blowing in order to result in a package according to the present invention are carried out sequentially on the same machine, and - ejection of the packaging thus obtained.

Alternatively, in this manufacturing process of the packaging according to the present invention, there is provided a heating step and / or conditioning between the injection step and the blowing step.

It can also be provided a stretching step of the preform, parallel to its blowing or between the injection and blowing steps.

Figures 2 and 3 are partial and perspective views of the upper part ~ o of the present invention.

The device according to the invention is designed from granules of desired materials in order to obtain a rigid package 1, transparent, translucent or, on the contrary, opaque. The packaging 1 is formed of: a body 2 serving as a container or container adapted to receive a content, a neck or ring 3 allowing means for extracting the conditioned content but also, for example, medium adapted to cooperate with a closure means 6, such as a plug; sometimes a counter-ring 4, and / or a collar or shoulders 5 adapted to receive closing means or obliteration 6. More precisely, the counter-ring 4 allows to ensure the connection between the 25 upper body 2 (or the neck 5) and the ring 3 (when said body does not have a neck 5) but also to allow, according to the desired forms of said final packaging 1, an axial compressive strength. The neck 5 connects the upper part of the body 2 to the counter-ring 4 or to the ring 3 itself (when there is no counter ring 4); and at least one axial compressive strength means 7, with respect to its main axis.

The obliterating means 6 are parts that are attached to or integrated in said package 1 and may be a cap, lid or capsule, for example. They close and thus protect a content through fastening means for sealing and removable closure via screwing, clipping, snapping or other means of attachment of a type known per se. The parameters allowing a good mechanical resistance to the compression forces of the openings / closures are, for example, for a plastic bottle, a height h of the ring 3, an angle a of walls of said package between the ring and the axis. central principal 15 of said package 1 as well as the height of the counter ring 4.

Advantageously, the present invention makes it possible to envisage smaller rings 3 and counter-rings 4 by providing for the presence of at least one resistor means 7 for axial compression on said preform 8.

These resistance, solidity or consolidation means 7 are in the form of projecting elements or lugs, appendices or reinforcements of substantially parallelepipedal shape and are arranged laterally with respect to said ring 3.

These lugs 7 join, assemble, join, connect or unite mechanically and physically the ring 3 and the upper walls of the body 2 (or counter-ring 4 and / or neck 5) of said package 1.

Advantageously, the lugs 7 may be arranged in the joint plane or coaxially with respect to said ring or substantially perpendicular to the joint plane.

Advantageously, the lugs 7 are arranged according to the wishes and needs of the manufacturer of said packaging. In other words, the lugs 7 can be arranged laterally or along the circumference of said ring and / or at its periphery in all possible orientations and dimensions so that said lugs can be demoldable and ro connect said ring to said ring. body of said package.

Preferably, two lugs are disposed diametrically opposite to said ring and join said ring to said body and more specifically to said counter-ring and / or said neck. Figures 4 and 5 are partial diagrams in cross section of the upper part of said device.

The resistance means 7 prevent sagging of the ring 3 and against the ring 4 and allow a large number of closures of the obliterating means 6, such as a snap of a capsule.

Thus, according to the present invention, it is possible to design a rigid plastic packaging while respecting marketing and environmental constraints 2s tending to reduce the size of the ring, the stopper and therefore the counter ring without losing resistance to axial compression.

Figures 6 and 7 are schematic illustrations of the molding steps of the device according to the invention. The method of manufacturing the device according to the invention consists of three main steps: i. injection-molding a preform 8 from granules of selected material; ii. blowing said preform into a blow mold 9, held by a ring mold 10; iii. ejection of the packaging thus obtained; in which a molding, blowing and ejection of at least one axial compression resisting means 7 is provided, arranged laterally with respect to said ring 3 and / or the counter-ring 4.

Advantageously, this process for manufacturing the package according to the present invention may include an additional step of reheating and / or conditioning between the injection stage and the blowing stage.

Advantageously, said method of manufacturing said package may include an additional stretching step before or parallel to the blowing. The injection and molding step serves to form or mold a preform 8 of desired conformation in a preform mold 11 which will then be blown. This step therefore includes the molding of the lugs 7.

2s Thus the lugs 7 are injected before undergoing the blowing step. Their configuration (shape, size, disposition) are determined beforehand with respect to the geometry of the desired packaging 1.

According to FIG. 6, the upper part of the preform 8 is totally molded with its lugs 7 of the desired shape in half-molds 20 lo of the ring 10 and the lower part of the preform 8 in the preform mold 11.

According to another embodiment and FIG. 7, the upper part of the preform 8 is partially molded with its lugs 7 of desired shape in ring half-molds 10 and the preform mold 11.

Figures 8 and 9 are schematic illustrations of the blowing steps of the device according to the invention.

This step makes it possible to blow the preforms 8 comprising their lugs 7 against a desired blowing mold 9, and to make them take on a desired final shape. At this stage, it is chosen to have a mold to form a final packaging 1, rigid plastic, with or without a counter-ring 4 and / or a neck 5.

FIG. 8 corresponds to the blowing of the device according to the invention described in FIG. 6. According to this figure, the blow-molding of the counter-ring 4, comprising the lugs 7 of the package 1, is carried out inside the lower face of the ring mold 10.

Alternatively, there is provided a flat molding where there is no counter-ring 4 at the base of the ring 3 of said package, that is to say that said counter-ring is melted or assimilated to the shoulders or collar 5 of said package. The upper face of the blown body 2 of the package 1 then comes into contact with the lugs 7 as illustrated in FIG. 10. According to another embodiment and in FIG. 9 corresponding to the blowing of the device described in FIG. , the blowing of the counter-ring 4 is carried out against the wall of the blow mold 9 in the case where it is desired a counter-ring 4. According to this configuration, there are provided recesses or notches 12, able to cooperate with said lugs 7, at the upper part of the blow mold 9 as illustrated in FIG. 11.

Alternatively, in the case of a flat molding, the upper face of the blown body 2 of the package 1 is then flush with the lugs 7 against the wall of the blowing mold 9.

To summarize, the injection-molding step of the solidity means 7 is carried out either completely or partially in the ring mold 10 and the blowing step is carried out either by means of the ring mold 10 or by the blow mold 9 which comprises or not the negative form of a counter-ring 4 and lugs 7.

The device according to the invention makes it possible to obtain a rigid plastic package 1 having an axial compression resistance force exerted on the top of the vertical walls during the openings / closures of said package and opposing the deformation of the shoulders. 5 and / or against the ring-ring 4. The presence of the solidity means 7 makes it possible to increase the axial resistance by at least 20%.

Advantageously, the packages according to the present invention can be used in all types of desired application in all the desired areas such as cosmetics, pharmaceuticals, food processing, cleaning products or household or industrial etc.

The present invention makes it possible, among other things, to reduce the cost and the production of packaging and have a very favorable impact on the environment.

LEGEND

1 package 2 body

3 ring

io 4 counter-ring

5 col

6 means of closing the package 15 7 means of resistance

8 preform

20 9 mold blow molding ring mold

11 preform mold 25 12 notch

Claims (12)

REVENDICATIONS1. Rigid plastic packaging (1) produced by injection-blow molding, formed of a body (2) and a ring (3), characterized in that it comprises at least one resistance means (7) at an axial compression arranged laterally with respect to said ring (3). 2. Package according to claim 1, characterized in that said resistance means (7) is a projecting element, pin, appendage or reinforcement of parallelepiped shape. 3. Packaging according to the preceding claim, characterized in that said lug (7) connects said ring (3) and said body (2). 4. Packaging according to one of claims 2 or 3, characterized in that said lug (7) is disposed in the joint plane or substantially perpendicular to the joint plane or coaxially with respect to said ring (3). ). 5. Packaging according to claim 1, characterized in that said body (2) comprises a counter-ring (4) and / or a neck (5). 25 6. A method for obtaining a rigid plastic packaging (1) formed of a body (2) and a ring (3) comprising the following steps i. injecting and molding a preform (8) from granules of selected material, ii. blowing said preform into a blow mold (9) held by a ring mold (10); iii. ejection of the packaging thus obtained; characterized in these steps include molding, blowing and ejecting at least one axial compression resisting means (7) disposed laterally with respect to said ring (3). 7. Method according to claim 6, characterized in that it comprises a step of reheating and / or conditioning between steps i) and ii). 8. Method according to claim 6 or 7, characterized in that steps i) and ii) are performed sequentially on the same machine. 9. The method of claim 6 to 8 characterized in that it comprises a drawing step between steps i) and ii) or parallel to step ii). 20 10. Method according to one of claims 6 to 8, characterized in that the injection-molding step of said strength means (7) is carried out partially or completely in the ring mold (10). 11. Method according to one of claims 6 to 9, characterized in that the blowing step is performed via a ring mold (10) or a blow mold (9). 12. Method according to claim 6 or 11, characterized in that said blow mold (9) comprises a negative form forming a counter ring (4) and / or a neck (5) and / or notches (12). . 15