Resin molded article manufacturing device, and manufacturing device control method
US-12076900-B2 · Sep 3, 2024 · US
Method and apparatus for substantially constant pressure injection molding of thinwall parts
US2016176084A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016176084-A1 |
| Application number | US-201615054655-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 26, 2016 |
| Priority date | May 20, 2011 |
| Publication date | Jun 23, 2016 |
| Grant date | — |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A substantially constant pressure injection molding method and machine that forms molded parts by injecting molten thermoplastic material into a mold cavity at a substantially constant pressure. As a result, the mold cavity is filled with molten thermoplastic material by advancing a continuous flow front of thermoplastic material from a gate to an end of the mold cavity.
First claim
Opening claim text (preview).
What is claimed is: 1 . A method of injection molding a thinwall part at a substantially constant pressure, the method comprising: operating an injection system to advance molten thermoplastic material into a mold cavity at an increasing flow rate until a predetermined injection pressure is reached; and reducing the flow rate until the mold cavity is substantially filled with thermoplastic material to maintain a substantially constant injection pressure; wherein a peak flow rate occurs before the cavity is 30% filled. 2 . The method of claim 1 , wherein the peak flow rate occurs before the cavity is 20% filled. 3 . The method of claim 1 , wherein the peak flow rate occurs before the cavity is 10% filled. 4 . The method of claim 1 , wherein the injection system is operated to maintain a substantially continuous and moving flow front of thermoplastic material that moves without hesitation as the thermoplastic material advances through the mold cavity. 5 . The method of claim 1 , wherein the mold cavity is at least 99% full before the thermoplastic material at the flow front begins to freeze. 6 . The method of claim 1 , wherein the mold cavity has an L/T ratio of 100 or greater. 7 . The method of claim 1 , wherein the mold cavity has an L/T ratio of 200 or greater. 8 . The method of claim 1 , wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which fluctuates no more than 30%. 9 . The method of claim 1 , wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which fluctuates no more than 20%. 10 . The method of claim 1 , wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which is less than 10,000 psi. 11 . The method of claim 1 , wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which is less than 8,000 psi. 12 . The method of claim 1 , wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which is less than 7,000 psi. 13 . The method of claim 1 , wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which is less than 6,000 psi. 14 . The method of claim 1 , wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure from when the predetermined injection pressure is reached until the mold cavity is completely filled with the thermoplastic material.
Assignees
Inventors
Classifications
- B29C45/77Primary
of velocity or pressure of moulding material · CPC title
Pressure · CPC title
Injection · CPC title
- B29C45/0046Primary
Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity · CPC title
Feeding the material into the injection moulding apparatus {, i.e. feeding the non-plastified material into the injection unit} · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2016176084A1 cover?
- A substantially constant pressure injection molding method and machine that forms molded parts by injecting molten thermoplastic material into a mold cavity at a substantially constant pressure. As a result, the mold cavity is filled with molten thermoplastic material by advancing a continuous flow front of thermoplastic material from a gate to an end of the mold cavity.
- Who is the assignee on this patent?
- Imflux Inc
- What technology area does this patent fall under?
- Primary CPC classification B29C45/77. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Thu Jun 23 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).