Injection molding system, method, and tote manufactured therefrom

Patent metadata

Field	Value
Publication number	US-12377589-B2
Application number	US-202418428853-A
Country	US
Kind code	B2
Filing date	Jan 31, 2024
Priority date	Oct 30, 2019
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A storage container manufactured from an injection molding process which includes a mold and at least one injector. The mold has a top surface, a bottom wall, a plurality of side surfaces, and at least two separable sections. Where the at least two separable sections are in a closed position, a cavity is formed in the mold. The at least one injector is disposed through at least one of the plurality of sidewalls, and further disposed into the cavity. The storage container has a plurality of sidewalls, an upper edge, and a bottom surface. At least one of the plurality of sidewalls of the resulting storage container contains at least one sprue mark.

First claim

What is claimed is:

1. A method for manufacturing a storage container with an injection molding process, the method comprising steps of:
providing a mold having a top wall, a bottom wall, and a plurality of side surfaces, the plurality of side surfaces includes a first side surface, a second side surface, a third side surface, and a fourth side surface, the mold includes two sections, wherein when the mold is in a closed position, a cavity is formed between the two sections, the mold further includes a plurality of injectors directed into the cavity when the mold is in the closed position, the plurality of injectors including at least one bottom injector disposed through the bottom wall and a plurality of side injectors disposed through at least one of the plurality of side surfaces, the plurality of side injectors including a first pair of side injectors disposed through the first side surface and a second pair of side injectors disposed through the second side surface;
providing a molten material;
positioning the at least one bottom injector along the bottom wall and the plurality of side injectors along at least one of the plurality of side surfaces at a desired height and a desired lateral position to achieve a balanced fill of the cavity;
injecting the molten material through the plurality of injectors disposed through each of the bottom wall and the at least one of the plurality of side surfaces of the mold into the cavity; and
removing the storage container manufactured with the injection molding process from the mold.

2. The method of claim 1 , wherein the injection molding process has a total production time which is the time required to form the storage container, where the total production time of the storage container is about 55% less than a total production time of the storage container formed by the injection molding process but where the molten material is injected only at the bottom surface of the storage container.

3. The method of claim 1 , wherein the injection molding process has a fill time which is the time required to fill the cavity to form the storage container, wherein the fill time is between 2.5 seconds and 4.0 seconds.

4. The method of claim 1 , wherein the injection molding process includes injecting the molten material at a temperature between 350° F. and 550° F.

5. The method of claim 1 , wherein the injection molding process has a clamp force pressure which is the pressure required to hold a mold in a closed position to form the storage container during the injection molding process, where the clamp force pressure is about 25% less than a clamp force required to form the storage container by the injection molding process but where the molten material is injected only at a bottom surface of the storage container.

6. The method of claim 1 , wherein the injection molding process includes injecting the molten material through each of the bottom wall, the first side surface, the second side surface, the third side surface, and the fourth side surface.

7. The method of claim 1 , further including a central axis bisecting the bottom wall.

8. The method of claim 7 , wherein the at least one bottom injector is centrally disposed along the central axis of the bottom wall.

9. The method of claim 7 , wherein the at least one bottom injector further includes a first bottom injector and a second bottom injector.

10. The method of claim 9 , wherein the first bottom injector is disposed adjacent the second bottom injector, each of the first bottom injector and the second bottom injector are centrally disposed along the central axis of the bottom wall.

11. The method of claim 9 , wherein the at least one bottom injector further includes a third bottom injector disposed adjacent the first bottom injector and the second bottom injector, each of the first bottom injector, the second bottom injector, and the third bottom injector are disposed along the central axis of the bottom wall.

12. The method of claim 11 , wherein each of the first bottom injector, the second bottom injector, and the third bottom injector are equally spaced apart from one another along the central axis of the bottom wall.

13. The method of claim 11 , wherein the at least one bottom injector further includes a fourth bottom injector, each of the first bottom injector, the second bottom injector, the third bottom injector, and the fourth bottom injector are disposed through the bottom wall.

14. The method of claim 13 , wherein the at least one bottom injector further includes a fifth bottom injector, each of the first bottom injector, the second bottom injector, the third bottom injector, and the fourth bottom injector are disposed through the bottom wall, and the fifth bottom injector is centrally disposed along the central axis and equally spaced apart from each of the first bottom injector, the second bottom injector, the third bottom injector, and the fourth bottom injector.

15. The method of claim 1 , wherein the plurality of side injectors includes at least one side injector disposed through each of the third side surface and the fourth side surface.

16. The method of claim 1 , wherein the step of injecting the molten material further includes simultaneously injecting the molten material through each of the at least one bottom injector disposed through the bottom wall and the at least one of the plurality of side injectors disposed through the at least one of the plurality of side surfaces of the mold into the cavity.

17. The method of claim 1 , wherein the step of injecting the molten material further includes sequentially injecting the molten material through the at least one bottom injector disposed through the bottom wall and injecting the molten material through the at least one of the plurality of side injectors disposed through the at least one of the plurality of side surfaces of the mold into the cavity.

18. The method of claim 1 , wherein the step of injecting the molten material further includes sequentially injecting the molten material through the plurality of side injectors disposed through at least one of the plurality of side surfaces and injecting the molten material through the at least one bottom injector disposed through the bottom wall of the mold into the cavity.

19. A method for manufacturing a storage container with an injection molding process, the method comprising steps of:
providing a mold having a top wall, a bottom wall, and a plurality of side surfaces, the plurality of side surfaces includes a first side surface, a second side surface, a third side surface, and a fourth side surface, the mold includes two sections, wherein when the mold is in a closed position, a cavity is formed between the two sections, the mold further includes a plurality of injectors directed into the cavity when the mold is in the closed position;
providing a molten material;
positioning the plurality of injectors along locations of the mold to provide defined parameters of the storage container, the defined parameters of the storage container include providing a balanced fill of the cavity, a faster fill time of the cavity, a lower clamp force pressure, a faster total production time, a lower deflection point along a baseline point of the storage container, and a lower weight of the storage container;
injecting the molten material through the plurality of injectors; and
removing the storage container manufactured with the injection molding process from the mold,
wherein the injection molding process has a total production time which is the time requ

Assignees

• Creative Plastic Concepts Llc

Inventors

• Whitta Jacob H
• Hummel Eric

Classifications

• B29K2023/12

  PP, i.e. polypropylene · CPC title

• B29L2031/712

  Containers; Packaging elements or accessories, Packages (closures therefor B29L2031/56; ink or toner cartridges B29L2031/7678; squeeze tubes B29L2023/20; suitcases B29L2031/7418) · CPC title

• B29C2045/2716

  The gate axis being perpendicular to main injection axis, e.g. injecting into side walls of a container · CPC title

• B29C2045/0027

  Gate or gate mark locations · CPC title

• B29C45/0046

  Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity · CPC title