Process for injection moulding and injection moulding apparatus

Abstract

The present invention provides a process for injection moulding a plastic mass in a cavity using an injection element, comprising the steps of: feeding the plastic mass from the injection element into the cavity within a mould by feeding the plastic mass through a plurality of material supply openings such that a plurality of independent flow strands of the plastic mass are fed into the cavity, the cavity being configured to have at least one side planar surface, wherein the flow strands comprises a central flow strand and a plurality of surrounding flow strands; and forming a plurality of rectangular flow strands from the material supply openings.

Description

[0001] TITLE OF THE INVENTION

[0002] PROCESS FOR INJECTION MOULDING AND INJECTION MOULDING

[0003] APPARATUS

[0004] FIELD OF THE INVENTION

[0005] The present invention relates to a process for the injection moulding and an injection moulding apparatus. Particularly, the invention relates to a process for the injection moulding of a molten plastic mass via an injection moulding apparatus.

[0006] BACKGROUND OF THE INVENTION

[0007] Injection moulding is a technique conventionally used in the plastic industry. The technique involves heating and melting resin pellets and feeding them into the injection mould cavity.

[0008] For instance, a prior art injection moulding process for producing plastic containers is disclosed in German Patent Publication No. DE 196 17 349 Cl, in which thermoplastic material is pressed into the cavity of an injection mould via multiple tubular dies. The plastic material pressed into the injection mould through the annular passages of these dies retains the individual layers formed by the annular passages, even in the solidified state and thereafter.

[0009] A prior art injection moulding extrusion die for the injection of plastics, hard enable resins and rubber is disclosed in the European Patent No. EP 0 441 868 Bl, in which the position of closing tube in the extrusion die housing is adjustable. Adjustment of the axial position of the closing tube creates a central material flow that is surrounded by a sleeveshaped material flow supplied separately to the cavity. The material fed into the cavity flows in the same direction as the main axis of the injection moulding device.

[0010] Another prior art injection moulding process for the injection of molten plastics is disclosed in the US Patent No. US 6344164 Bl whereby an injection unit for injecting plastic into a cavity of a mould includes an injecting device connectable between an extrusion die and the mould. The injecting device includes a mouth having a plurality of openings that is insert able into the mould so that the plastic flows through the plural holes into the mould cavity. A drive is connectable to at least a portion of the injecting device for rotating the mouth portion and the plural opening of the injecting device about a central axis as the plastic flows through the holes into the mould.

[0011] Although various injection moulding processes in the art have been provided to form a plastic product, their capabilities in forming the product are limited to specific shapes, particularly round containers. The properties of the product are greatly affected by the variation of the shapes rendering the product to have undesirable properties.

[0012] Therefore, there is a need to develop a process for the injection moulding and an injection moulding apparatus which can provide a plastic product with desirable shape and properties.

[0013] SUMMARY OF THE INVENTION

[0014] One of the objectives of the invention is to provide a process for the injection moulding and an injection moulding apparatus that has a simple construction, uses as little injection pressure as possible to completely fill an injection mould cavity, and ensures the molten plastic material to have a non-isotropic structure immediately after its entry into the cavity and directing the molten resin vector flow path according to the plan view footprint of the injection mould cavity.

[0015] To achieve the objective, the invention is provided with a process for injection moulding a plastic mass in a cavity using an injection element, comprising the steps of: feeding the plastic mass from the injection element into the cavity within a mould by feeding the plastic mass through a plurality of material supply openings such that a plurality of independent flow strands of the plastic mass are fed into the cavity, the cavity being configured to have at least one side planar surface, wherein the flow strands comprises a central flow strand and a plurality of surrounding flow strands; and forming a plurality of rectangular flow strands from the material supply openings. Furthermore, the cavity is preferably in a rectangular form. Preferably, the central flow strand is fed into the cavity before the plurality of surrounding flow strands are fed into the cavity.

[0016] Preferably, the surrounding flow strands are directed outward from a central axis of the injection element.

[0017] Preferably, the material supply openings have a rectangular shape with a length to width ratio of more than 5:1.

[0018] In the preferred embodiments, the plurality of flow strands flow through and across one another causing turbulence mixing of the plastic mass. Also preferably, the plurality of flow strands flow through and across one another causing a complete re-plasticization of a first flow of the individual flow strands upon entering the cavity. Also preferably, the plurality of flow strands flow through and across one another causing a re-plasticization of a partially hardened portion of the plastic mass within the cavity.

[0019] Preferably, the plastic mass further comprises unplasticized pellets and wherein the plurality of flow strands causing the mixture of the pellets in the plastic mass within the cavity.

[0020] In additional embodiments, the plurality of flow strands flow through and across one another each forming a flow front which simultaneously reaches an end of flow, preferably a perimeter of the injection mould cavity. Also preferably, the plurality of flow strands flow through and across one another forming a flow front in a non-round shape within the cavity. Also preferably, the plurality of flow strands flow through and across one another forming a flow front in a rectangular pattern frontage.

[0021] A further embodiment of the invention is an injection moulding apparatus for injecting a plastic mass into a cavity within a mould comprising: an injecting device mountable between a machine extrusion die and the mould for receiving the plastic mass from the machine extrusion die and guiding the plastic mass toward the cavity of the mould, wherein the cavity is configured to have at least one side planar surface; the injecting device comprising a material supply part with a plurality of ports and a central axis, said ports connectable to the mould and having an opening through which the plastic mass flows, wherein at least one port is angled in relative to the central axis with its opening having a rectangular shape and at least one opening is arranged in parallel with another opening.

[0022] Preferably, the openings are arranged in a substantially rectangular shape and positioned in a rectangular co-ordinate to the central axis. Additionally, the openings have a length to width ratio of more than 5:1.

[0023] Preferably, the injecting device further comprises a central port arranged coaxially in relative to the central axis having a circular or rectangular opening.

[0024] An additional embodiment of the invention is a container manufactured by the process according to at least one of the above embodiments. Another embodiment of the invention is a container manufactured by the injection moulding apparatus according to at least one of the above embodiments.

[0025] Preferably, the container is in a substantially rectangular shape with a strand polymer chain molecular structure formation being set in a random orientation.

[0026] One skilled in the art will readily appreciate that the invention is well adapted to carry out the aspects and obtain the ends and advantages mentioned, as well as those inherent therein. The embodiments described herein are not intended as limitations on the scope of the invention.

[0027] BRIEF DESCRIPTION OF THE DRAWINGS

[0028] For the purpose of facilitating an understanding of the invention, there is illustrated in the accompanying drawing the preferred embodiments from an inspection of which when considered in connection with the following description, the invention, its construction and operation, and many of its advantages would be readily understood and appreciated.

[0029] FIG. 1 shows a cross-sectional view of an injecting device with a plurality of material supply openings according to an embodiment of the present invention. FIG. 2 shows a front view of the openings according to an embodiment of the present invention.

[0030] FIGs. 3A, 3B, 3C, and 3D show the flow strands of the plastic mass from the openings according to an embodiment of the present invention.

[0031] FIGs. 4A and 4B show the plan view of the cavity according to each embodiment of the present invention.

[0032] FIG. 5 shows the injection pressure comparison between an embodiment of the present invention and the prior art.

[0033] FIG. 6 shows the shrinkage rate performance from the products of an embodiment of the present invention and the prior art.

[0034] DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION

[0035] It is to be understood that the following detailed description will be directed to embodiments, provided as examples for illustrating the concept of the present invention only. The present invention is in fact not limited to the particular embodiments described, as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, since the scope of this invention will be limited only by the appended claims.

[0036] The detailed description of the invention is divided into various sections for the reader’s convenience only and disclosures found in any section may be combined with those in another section.

[0037] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0038] It must be noted that as used herein and in the appended claims, the singular forms “a”, “an” and “the” include plural referents unless the context clearly dictates otherwise.

[0039] “Comprising” or “comprises” is intended to mean that the compositions and processes include the recited elements, but does not exclude others. The term “approximately” when used before a numerical designation, e.g., dimensions, time, amount and such other, including a range, indicates approximations, which may vary by (+) or (-) 10%, 5% or 1%, or between any sub-range or sub-value thereof.

[0040] FIG. 1 shows an injection element 10 comprising an injecting device 11 and a plurality of material supply openings 20 with a mould 30 and an injection mould cavity 31. Before entering the injection element 10, resin pellets are fed from the machine hopper into the extrusion screw barrel whereupon the resin pellets are turned by the extrusion screw with the resin being melted by the external heater bans. The extrusion screw is configured to achieve a homogeneous and turbulent mix and melt of the plastic resin in preparation for injection through the injection element 10 and into the cavity 31.

[0041] The injecting device 11 is mounted between a machine extrusion die and a mould 31 and is configured to guide the plastic mass toward the cavity 31 of the mould 30. The injecting device 11 comprises a material supply part 12 with a plurality of ports 13 and a central axis 14, said ports 13 connectable to the mould 30 and having an opening 20 through which the plastic mass flows, wherein at least one port 13 is angled in relative to the central axis 14.

[0042] According to an embodiment of the invention, the cavity 31 is configured to have at least one side planar surface. Preferably, the cavity 31 is in a rectangular form.

[0043] FIG. 2 shows a front view of the openings 20 of the injecting device 11. The openings 20 and / or the material supply openings are configured to have a rectangular shape and at least one opening 20 is arranged in parallel with another opening 20. The openings 20 are arranged in a substantially rectangular shape and positioned in a rectangular coordinate to the central axis 14, when viewed with FIG. 1. Specifically, the openings 20 have a length to width ratio of more than 5: 1.

[0044] In a preferred embodiment, the injecting device 11 further comprises a central port 13a which is arranged coaxially in relative to the central axis 14. As shown, the central port 13a has a circular opening. Alternatively, the central port 13a may have a rectangular opening. An embodiment of the invention relates to a process for injection moulding a plastic mass in a cavity 31 using an injection element 10 comprising the steps of feeding the plastic mass from the injection element 10 into the cavity 31 within a mould 30 by feeding the plastic mass through a plurality of material supply openings 20 where flow strands of the plastic mass are fed into the cavity 31 configured to have at least one side planar surface.

[0045] FIG. 3A and 3B show the flow strands 40 of the plastic mass from the material supply openings 20. A plurality of independent flow strands 40 of the plastic mass are fed into the cavity 31 wherein the flow strands 40 comprises a central flow strand and a plurality of surrounding flow strands. Furthermore, the process comprises forming a plurality of rectangular flow strands from the material supply openings 20. Preferably, the surrounding flow strands are directed outward from the central axis 14 of the injection element 10.

[0046] Particularly, FIG. 3A depicts the first stage flow where the flow strand is fed from the central port 13a before other ports. FIG. 3B depicts the plastic mass flowing into the cavity 30 with the surrounding four openings almost joining with the first stage flow. The material supply openings 20 preferably have a rectangular shape with a length to width ratio of more than 5:1. Correspondingly, the cavity 31 is preferably in a rectangular form, the central flow strand is fed into the cavity 31 before the plurality of surrounding flow strands are fed into the cavity 31.

[0047] FIG. 3C further shows the flow path of the plastic mass and the junction point where the central flow fluid communicates with the four outer opening flow fronts. FIG 3D shows simulated flow paths where the fluid communication resulting turbulence converts the laminar flow polymer chains into a random orientation or a anisotropic formation. As shown, the plurality of flow strands 40 flow through and across one another causing turbulence mixing of the plastic mass.

[0048] As the molten resin flows through the multiple ports 13, and into the injection mould cavity 31, they flow across and into each other creating a multiple dimensional turbulent flow, causing turbulence and homogeneous mixing of the molten plastic with the strand polymer chain molecular structure formation being set in a random orientation. Additionally, shear is generated which increases the melt temperature of the molten resin flow front allowing the flow fronts to homogeneously mix and weld together. As a result, the shrinkage rate of the moulded product can be reduced.

[0049] Furthermore, it is possible to form the molten resin microcellular structure’s polymer chains and connected elements in a random anisotropic orientation.

[0050] Also further, it is possible to form an amorphous structure within the cavity.

[0051] In another embodiment, the plurality of flow strands 40 flow through and across one another causing a complete re-plasticization of a first flow of the individual flow strands upon entering the cavity 31. Additionally, the plurality of flow strands 40 flow through and across one another causing a re-plasticization of a partially hardened portion of the plastic mass within the cavity 31.

[0052] Moreover, the plurality of flow strands 40 flow through and across one another each forming a flow front which simultaneously reaches an end of flow, preferably a perimeter of the injection mould cavity 31. The perimeter of the injection mould cavity can either be round or non-round in shape. As a result, the molten resin flow front is formed in a desirable shape and in relationship with the plan footprint of the injection mould cavity 31. Particularly, based on the configuration of the ports 13 positioned adjacent to the cavity 31, the flow front forms into a shape which is substantially identical to the footprint perimeter of the injection mould cavity 31.

[0053] Additionally, when the plurality of flow strands flow front meet, it results in raising the melt flow index of the resin.

[0054] Preferably, the plastic mass further comprises unplasticized pellets and wherein the plurality of flow strands 40 causing the mixture of the pellets in the plastic mass within the cavity 31. As the above-mentioned flow method generates heat, it re-plasticizes the molten resin and removes any cold slugs, un-plasticized resin pellets and other cured surfaces which may restrict the flow rate of the molten resin.

[0055] FIG. 4A depicts the injection mould cavity 31 being configured to have at least one side planar surface. In this embodiment, the cavity 31 is rectangular and comprises the gates 32 configured to receive with the openings. The gates comprise a rectangular central gate and four outer gates being rectangular in shape with the two gates feeding the long flow paths being 30% larger than the two outer gates feeding the shorter flow lengths.

[0056] Furthermore, and especially for the targeted guidance of the molten resin vector flow path, an impact plate may be provided in the injection mould cavity perpendicularly opposite to the injection device multiple flow ports. This plate has a rectangular formed crater that assists in guiding the molten resin in a rectangular form evenly to the perimeter of the rectangular injection mould cavity.

[0057] FIG. 4B shows an alternative embodiment of the injection mould cavity 31. The cavity 31 is round and comprises the round central gate 32 with the four outer gates being identical in shape and dimensions. The configuration of the gates 32 ensures the molten resin flow front, and after the multiple gate flow fronts fluid communicate, forms a round flow front and to suit layout of the round cavity 31.

[0058] In a specific embodiment, the process comprises feeding the molten plastic mass from the injection element 10 having a central first stage cylindrical flow port into a cavity 31 through a plurality of independently sized supply openings 20 of ports 13 which forms a plurality of independently sized flow strands 40 within the injection mould cavity 31. The size of the ports 13 is calculated according to the plan view footprint of the injection mould cavity 31. Accordingly, the larger in size of the ports 13 will promote the flow of molten resin flow in the direction of the longer vector cavity flow lengths and the smaller in size of the ports 13 will promote the lesser flow of molten resin flow in the direction of the shorter vector cavity flow lengths. It is an objective to achieve complete filling of the injection mould cavity 31 instantaneously around its perimeter of that may be irregularly shaped, particularly in rectangular shape.

[0059] More specifically, the flow ports that feed molten resin towards the longer rectangular vector flow paths are significantly dimensionally bigger than the flow ports which feed the molten resin towards the shorter rectangular vector flow paths.

[0060] From the sizing and positioning of the ports 13, the desired flow front pattern may be achieved, in turn, the end of flow simultaneously injection pressure values will be substantially identical around the moulded product perimeter. As such, it is possible to eliminate the moulded product distortion.

[0061] In another specific embodiment, an injection moulding apparatus comprises an injecting device 11 for injecting a plastic mass into an injection mould cavity 31 which is mounted within an injection mould 30 for receiving the molten plastic mass from the machine extrusion barrel and guiding the plastic mass to the cavity 31 of the mould 30. Said injecting device 11 has a material supply part with a flow port 13 around a central axis 14 where the flow port 13 is connectable to the mould 30 and has a plurality of multi-sized openings 20 through which the plastic mass flows.

[0062] For especially targeted guidance of the molten plastic material threads fed to the injection mould cavity 30, the ports 13 are positioned with two identically sized larger flow ports are centrally positioned top and bottom of the cavity footprint with two identically sized smaller flow ports are positioned centrally positioned left and right of the cavity footprint, when viewed from the front view.

[0063] In further embodiments, the molten plastic mass is initially injected through the center port 13a in a laminar flow pattern. Then, the plastic mass is fed through the plurality of flow ports 13 and into the injection mould cavity 31. The two larger flow ports will hydraulically communicate with the molten resin first with the other two smaller flow ports opening for molten resin flow immediately afterwards. Due to the independent flow ports 40 being created at an inverted angular profile in relationship to the central axis 14 of the cavity 31 and the arrangement of the openings 20, a desirable turbulent homogeneous mix is created with the polymer flow threads being cross linked in a three-dimensional non isotropic polymer chain microcellular structure. Particularly, the molten plastic mass is converted from a semi-crystalline laminar flow microcellular structure to an amorphous microcellular structure.

[0064] Moreover, due to the increase in molten resin flow fill projected area, through the multiple flow ports 13, the injection pressure needed to completely fill the injection mould cavity is reduced which limits the event of in-moulded stress levels and post moulding distortion as well as reducing the machine clamp pressure normally needed to maintain the injection mould 30 in its fully closed position.

[0065] Furthermore, due to the increased projected area of fill, the invention requires decreased injection pressure and energy to completely fill the injection mould including creating turbulent non-laminar flow. A lesser quantity of material is needed. In addition, the orientation of the plastic material polymer chains randomly allows plastic moulded products to the produced with significantly thinner wall sections.

[0066] Still furthermore, particularly in the case of the injection of non-round products with thin wall section e.g. rectangular pails and lids, due to the molten plastic material being directed across and against each other during 1st stage injection, a turbulent homogeneous mixing of the molten resin is achieved forming the resin polymer chains in a random cross linked molecular orientation.

[0067] From the above embodiments, the present invention may increase the project area of molten resin flow firstly through the ports and then into an injection mould cavity by 100-fold and when compared to existing prior art injection devices. For example, a prior art invention flow port into the injection mould cavity is about 3mm diameter with a projected flow area of 7.00 square millimeters while the projected area of fill of the present invention is 35 square millimeters. As a result, the injection fill time normally needed to fill the cavity as well as the injection pressure can be reduced.

[0068] Furthermore, In Mould Labelling (IML) will also be possible. A printed label is positioned within an injection mould cavity and when the injection mould is in its open cycle, the label is charged with static electricity. Then, the label sticks to the cavity lateral wall and the injection cycle begins. The molten resin flows around the injection mould core and underneath the label. Finally, the product is ejected from the mould with the label in place. From the invention, the label can be placed without any movement or buckling.

[0069] An additional embodiment of the invention is a container manufactured by the process and / or the injection moulding apparatus as described. The container is preferably in a substantially rectangular shape. More preferably, the container with a strand polymer chain molecular structure formation being set in a random orientation. Due to the conversion of the molten plastic mass particularly from a semicrystalline laminar flow microcellular structure to an amorphous microcellular structure, a container produced using the invention exhibits similar characteristics to amorphous plastic products. Furthermore, the container of the invention, preferably in a rectangular shape produced from polypropylene resin, has desirable properties on impact resistance and the suitability to package solvent-based products with minimal permeation of the solvent through the container.

[0070] FIG. 5 shows the comparison of the injection pressure required based on the wall thickness of a container between an embodiment of the present invention and the prior art.

[0071] From the embodiments, the injection pressure normally needed to completely fill an injection mould cavity can be reduced, for example, by approximately 10% relative to the existing prior art. For instance, the injection pressure required for a wall thickness of 1 mm is approximately 60 MPa.

[0072] FIG. 6 shows the comparison of the shrinkage rate performance of a container between an embodiment of the present invention and the prior art.

[0073] The process and / or the apparatus according to the above embodiment results in increasing the density of the polymer resin microcellular structure, thereby improving the dynamic impact performance of the container. Also, due to the shear generated, the shrinkage rate of the container can be reduced approximately from 1.8% to 0.3%.

[0074] The inventor has discovered that a product produced by the process and / or the apparatus according to the above embodiment are lighter due to the mixing of the molten resin flow fronts creating a turbulent flow. Additionally, the mixing of the molten resin ensures the production of products that are stronger compared to the prior arts. Furthermore, the event of product in-moulded stress that causes product distortion can be reduced and the injection pressure needed to fill a mould cavity can be reduced compared to the conventional injection moulding technology.

[0075] Although specific embodiments of the invention have been disclosed and described, as well as illustrated in the accompanying drawings, these are simply for the purpose of a better understanding of the principles of the present invention and are not meant to impose a limitation on the scope and spirit of the teaching of the present invention. Adaption and modification to various structures, such as design or material of the invention, are possible and apparent to a skilled person without departing from the scope of the present invention, which is to be determined by the claims.

Claims

AMENDED CLAIMS received by the International Bureau on 02 December 2025 (02.12.2025)

1. [Amended A process for injection moulding a plastic mass in a cavity (31) using an injection element (10) comprising an injecting device (11) having a central axis (14) and a plurality of material supply openings (20), comprising the steps of: feeding the plastic mass from the injection element (10) into the cavity (31) within a mould (30) by feeding the plastic mass through the plurality of material supply openings (20) such that a plurality of independent flow strands (40) of the plastic mass are fed into the cavity (31), wherein the openings (20) are arranged in a substantial rectangular shape and positioned in a rectangular coordinate to the central axis (14), the cavity (31) being configured to have at least one side planar surface, wherein the flow strands comprise a central flow strand and a plurality of surrounding flow strands; and forming a plurality of rectangular flow strands from the material supply openings, wherein the independent flow strands (40) of the plastic mass comprising a central flow strand and a plurality of surrounding flow strands which are directed outward from the central axis (14) of the injection element.

2. [Amended The process of claim 1 , wherein the central flow strand is fed into the cavity (31) before the plurality of surrounding flow strands are fed into the cavity (31).

3. [Cancelled

4. [Amended The process of claim 1 , wherein the material supply openings (20) have a rectangular shape with a length to width ratio of more than 5:1.

5. [Amended The process of claim 1 , wherein the plurality of flow strands (40) flow through and across one another causing turbulence mixing of the plastic mass.

6. [Amended The process of claim 1 , wherein the plurality of flow strands (40) flow through and across one another causing a complete re-plasticization of a first flow of the individual flow.

7. [Amended The process of claim 1 , wherein the plurality of flow strands flow (40) through and across one another causing are-plasticization of a partially hardened portion of the plastic mass within the cavity.

8. The process of claim 1 , wherein the plastic mass comprises unplasticized pellets and wherein the plurality of flow strands causing the mixture of the pellets in the plastic mass within the cavity.

9. [Amended The process of claim 1 , wherein the plurality of flow strands flow (40) through and across one another each forming a flow which simultaneously reaches an end of flow, preferably a perimeter of the injection mould cavity.

10. [Amended The process of claim 1 , wherein the plurality of flow strands flow (40) through and across one another forming a flow front in a non-round shape within the cavity.

11. [Amended The process of claim 1 , wherein the cavity (31) is in a rectangular form.

12. [Amended The process of claim 11 , wherein the plurality of flow strands flow (40) through and across one another forming a flow front in a rectangular pattern frontage.

13. [Amended An injection moulding apparatus for injecting a plastic mass into a cavity within a mould comprising: an injecting device (11) mountable between a machine extrusion die and the mould for receiving the plastic mass from the machine extrusion die and guiding the plastic mass toward the cavity of the mould, wherein the cavity is configured to have at least one side planar surface; the injecting device (11) comprising a material supply part (12) with a plurality of ports (13) and a central axis (14), said ports (13) connectable to the mould and having an opening (20) through which the plastic mass flows, wherein at least one port is angled in relative to the central axis (14) with its opening (20) having a substantial rectangular shape, and wherein the openings (20) are positioned in a rectangular coordinate to the central axis (14), and at least one openings is arranged in parallel with another opening.

14. ] [Cancelled

15. [Amended The injection moulding apparatus of claim 13, wherein the openings (20) have a rectangular shape with a length to width ratio of more than 5:1.

16. The injection moulding apparatus of claim 13, wherein the cavity is in a rectangular form.

17. [Amended The injection moulding apparatus of claim 13, wherein the injecting device (11) further comprises a central port (13a) coaxially in relative to the central axis (14) having a circular or rectangular opening.

18. [Amended A container manufactured by the process of claim 1 , wherein the container is in a substantially rectangular shape with a strand polymer chain molecular structure formation being set in a random orientation.

19. [Added The process of claim 1 , wherein the plurality of flow strands flow through and across one another causing turbulence and homogeneous mixing of the molten plastic with the strand polymer chain molecular structure formation being set in a random orientation.

20. [Added The apparatus of claim 13, wherein the ports (13) being created at an inverted angular profile in relationship to the central axis (14).

21. [Added The apparatus of claim 13, wherein the plurality of port (13) of the material supply part (12) being arranged around the central axis (14) and having a plurality of multi-sized openings (20) through which the plastic mass flows.

22. [Added The apparatus of claim 21 , wherein the size of each one of the plurality of multi-sized openings (20) is determined according to the plan view footprint of the injection mould cavity (31).

23. [Added The apparatus of claim 13, wherein geometric profile of ports (13) is in accordance with the plan view shape of the injection mould cavity (31).

24. [Added The apparatus of claim 13, wherein the mould cavity (31) is provided with an impact plate perpendicularly opposite to the injecting device (11), wherein the impact plate has a rectangular formed crater that assists in guiding the molten resin in a rectangular form evenly to the perimeter of the rectangular injection mould cavity (31).

25. [Added The container of claim 18, wherein the container has amorphous microcellular structure and exhibits similar characteristics to amorphous plastic.

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