CN105415576A - Discharging method for microcellular foam injection molding technology - Google Patents
Discharging method for microcellular foam injection molding technology Download PDFInfo
- Publication number
- CN105415576A CN105415576A CN201510932974.8A CN201510932974A CN105415576A CN 105415576 A CN105415576 A CN 105415576A CN 201510932974 A CN201510932974 A CN 201510932974A CN 105415576 A CN105415576 A CN 105415576A
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- China
- Prior art keywords
- nitrogen
- injection
- screw
- flow velocity
- plasticizing
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a discharging method for a microcellular foam injection molding technology. The method comprises steps as follows: the heating temperature of raw materials is adjusted and is increased from 255 DEG C to 265 DEG C; pressure of nitrogen and plastic is adjusted, and 245 Bar of nitrogen supercritical fluid backpressure and 220 Bar of melt backpressure are adopted; the flow velocity and the duration of nitrogen injection are adjusted, the flow velocity is increased to 0.73 KG/h, and the injection time is prolonged to 20 s; plasticizing is started, and the raw materials are plasticized at a screw speed of 70 r/min; when the screw position reaches 30 mm, an injection head of nitrogen is opened, and the nitrogen starts to be injected; wen the nitrogen injection time reaches 20s or reaches 80% of a plasticizing stroke, the nitrogen injection is stopped; after the plasticizing is finished, a screw is driven to discharge melt to the air at a speed of 30 mm/s; the operation is repeated for 3-5 times, the obvious cellular structure is visible through observation in the discharged raw materials, and the discharging can be finished. With the adoption of the method, the number of waste products is reduced to 2 pieces from more than 15 pieces originally during production starting.
Description
Technical field
The present invention relates to a kind of frothing injection technique, particularly a kind of discharging method for microporous foam Shooting Technique.
Background technology
MuCell microporous foam injection molding technology is by increasing the pressure of nitrogen to supercriticality, then note in injection machine plasticizing process in feed pipe and (expect that in pipe, plastic melt is also high pressure conditions, its pressure is lower than nitrogen pressure 3-5bar), then by the rotation realization of screw rod and the Homogeneous phase mixing of plastic melt, form homodisperse single-phase body, inject mould, pressure, temperature variation, promote nitrogen gas foaming, obtain the plastic product that there is uniform bubble structure inside, this technology belongs to emerging technology at Injection Industry, can be applicable to the plastic products of lightweight demand.
When industry inherence uses this technology to produce, first carry out discharge (the raw material new raw material cleaning that material pipe internal screw adheres to being replaced), not nitrogen injection during discharge, produce after discharge completes, start to produce, produce nitrogen injection, because nitrogen injects and mixes with plastics need the regular hour, after general 15-20 circulation, nitrogen just can evenly spread in plastic melt, cause each produce to start all to produce 15-20 part and to foam uneven waste product.
Summary of the invention
The object of the invention is to solve the waste product problem existed in above-mentioned technique, and a kind of discharging method for microporous foam Shooting Technique is provided.
Method of the present invention comprises the following steps:
One, adjust raw-material heating-up temperature, heating raw materials temperature is promoted to 265 DEG C from 255 DEG C.
Two, adjust the pressure of nitrogen and plastic cement, use the nitrogen supercritical fluid of 245Bar and the melt back pressure of 220Bar;
Three, adjust flow velocity and the duration of nitrogen injection, flow velocity is promoted to 0.73KG/h, and injection length is increased to 20s;
Four, start plasticizing, use the screw speed of 70 revs/min to start to plastify raw material; The injection head opening nitrogen when screw position arrives 30mm starts nitrogen injection; Nitrogen injection is stopped when the nitrogen injection time reaches 20s or reach plastify stroke 80%;
Five, after having plastified, drive screw with the speed of 30mm/s by melt to air discharge;
Six, repeat aforesaid operations 3-5 time, observe visible obviously foam structure in the raw material of discharging and can complete discharge;
Seven, the numerical value such as materials processing temperature, nitrogen and plastic cement pressure are adjusted back normal numerical value of producing to start to produce.
Beneficial effect of the present invention: after applying this aerating discharging method, produces startup quantity scrapped and is reduced to 2 from more than original 15.
Accompanying drawing explanation
Fig. 1 is process schematic of the present invention.
Detailed description of the invention
Method of the present invention comprises the following steps: as shown in Figure 1,
One, adjust raw-material heating-up temperature, heating raw materials temperature is promoted to 265 DEG C from 255 DEG C.
Two, adjust the pressure of nitrogen and plastic cement, use the nitrogen supercritical fluid of 245Bar and the melt back pressure of 220Bar;
Three, adjust flow velocity and the duration of nitrogen injection, flow velocity is promoted to 0.73KG/h, and injection length is increased to 20s;
Four, start plasticizing, use the screw speed of 70 revs/min to start to plastify raw material; The injection head opening nitrogen when screw position arrives 30mm starts nitrogen injection; Nitrogen injection is stopped when the nitrogen injection time reaches 20s or reach plastify stroke 80%;
Five, after having plastified, drive screw with the speed of 30mm/s by melt to air discharge;
Six, repeat aforesaid operations 3-5 time, observe visible obviously foam structure in the raw material of discharging and can complete discharge;
Seven, the numerical value such as materials processing temperature, nitrogen and plastic cement pressure are adjusted back normal numerical value of producing to start to produce.
Claims (1)
1., for a discharging method for microporous foam Shooting Technique, the method comprises the following steps:
One, adjust raw-material heating-up temperature, heating raw materials temperature is promoted to 265 DEG C from 255 DEG C;
Two, adjust the pressure of nitrogen and plastic cement, use the nitrogen supercritical fluid of 245Bar and the melt back pressure of 220Bar;
Three, adjust flow velocity and the duration of nitrogen injection, flow velocity is promoted to 0.73KG/h, and injection length is increased to 20s;
Four, start plasticizing, use the screw speed of 70 revs/min to start to plastify raw material; The injection head opening nitrogen when screw position arrives 30mm starts nitrogen injection; Nitrogen injection is stopped when the nitrogen injection time reaches 20s or reach plastify stroke 80%;
Five, after having plastified, drive screw with the speed of 30mm/s by melt to air discharge;
Six, repeat aforesaid operations 3-5 time, observe visible obviously foam structure in the raw material of discharging and can complete discharge;
Seven, the numerical value of materials processing temperature, nitrogen and plastic cement pressure is adjusted back normal numerical value of producing to start to produce.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510932974.8A CN105415576A (en) | 2015-12-15 | 2015-12-15 | Discharging method for microcellular foam injection molding technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510932974.8A CN105415576A (en) | 2015-12-15 | 2015-12-15 | Discharging method for microcellular foam injection molding technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105415576A true CN105415576A (en) | 2016-03-23 |
Family
ID=55494331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510932974.8A Pending CN105415576A (en) | 2015-12-15 | 2015-12-15 | Discharging method for microcellular foam injection molding technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105415576A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6347117A (en) * | 1986-08-13 | 1988-02-27 | Mitsubishi Heavy Ind Ltd | Method for changing resin in injection molder and device therefor |
| JPH02252517A (en) * | 1989-03-28 | 1990-10-11 | Toyo Mach & Metal Co Ltd | Purging method for injection molding machine |
| CN101245290A (en) * | 2007-02-17 | 2008-08-20 | 大赛璐高分子株式会社 | Detergent resin composition for shaping apparatus |
| US20150328812A1 (en) * | 2014-05-19 | 2015-11-19 | Nissei Plastic Industrial Co., Ltd. | Method of purging for an injection molding machine |
-
2015
- 2015-12-15 CN CN201510932974.8A patent/CN105415576A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6347117A (en) * | 1986-08-13 | 1988-02-27 | Mitsubishi Heavy Ind Ltd | Method for changing resin in injection molder and device therefor |
| JPH02252517A (en) * | 1989-03-28 | 1990-10-11 | Toyo Mach & Metal Co Ltd | Purging method for injection molding machine |
| CN101245290A (en) * | 2007-02-17 | 2008-08-20 | 大赛璐高分子株式会社 | Detergent resin composition for shaping apparatus |
| US20150328812A1 (en) * | 2014-05-19 | 2015-11-19 | Nissei Plastic Industrial Co., Ltd. | Method of purging for an injection molding machine |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160323 |