CN209336053U - Extrusion foaming piece head - Google Patents
Extrusion foaming piece head Download PDFInfo
- Publication number
- CN209336053U CN209336053U CN201822006161.8U CN201822006161U CN209336053U CN 209336053 U CN209336053 U CN 209336053U CN 201822006161 U CN201822006161 U CN 201822006161U CN 209336053 U CN209336053 U CN 209336053U
- Authority
- CN
- China
- Prior art keywords
- sheet material
- material runner
- melt flow
- extrusion foaming
- piece head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
A kind of extrusion foaming piece head, including polymer melt flow type chamber made of being fastened as sheet material runner cope plate and sheet material runner lower template, the two sides of sheet material runner cope plate and sheet material runner lower template are respectively equipped with sheet material runner side template, the two sides of polymer melt flow type chamber are respectively formed with entrance and exit, polymer melt flow type chamber is on direction from the inlet to the outlet, sequentially form isometrical area, transition region, shrinking zone and flat region, sidewall width of the melt flow ejector half chamber on sheet material runner cope plate and sheet material runner lower template is gradually increased in transition region, and the shape of the melt flow ejector half chamber formed on sheet material runner cope plate and sheet material runner lower template is full symmetric relative to the buckling surface of the two.The utility model passes through the structure setting of polymer melt flow type chamber, guarantees the stable gas pressure in technical process, it is ensured that foaming product surface is smooth, even width is consistent, high yield rate.
Description
Technical field
The utility model relates to a kind of extrusion foaming piece heads, belong to machinery manufacturing technology field.
Background technique
Extruder be continuously mixed for rubber, plastics, the device of extrusion molding, head is the main portion of extruder
Part, head are provided with stock mould, and it is flat that head is changed into the one of plastics and foaming agent from extruder by rotary motion
Row linear motion along the importing stock mould that certain runner passes through head neck uniform and stable, and assigns homogeneous system molding
Necessary briquetting pressure, become uniform system and prevent in machine nucleation and foaming, the shape of material is determined
Type and stabilization, while to its finishing, to obtain that sectional dimension is more accurate, the consistent continuous foamed material of cross sectional shape.
What traditional tubulose die head squeezed out is a foaming tube, and the difference of foam degrees causes the diameter of the pipe squeezed out not
Together, to the width of the bandlet of preparation can be made to be difficult to reach lesser tolerance, therefore, yield rate is greatly reduced.Common blows
Pipe die head is entirely open-celled structure due to generation, can be quickly generated a hollow tube, therefore, the internal stress of generation after die head out
Greatly, cause foaming bandlet surface smoothness is bad, striped is more and do not have matt effect.Further, since foaming process is not
It is easy to control, and cause stress unevenly, to cause the difference of foam degrees.
In addition, after polymer melt goes out head, having a large amount of bubble nucleatings in the technique of extrusion foaming sheet material and growing
It causes polymer melt sharply to expand, is arranged according to the planform of melt flow ejector half chamber in head, it in a thickness direction can be with
Free wxpansion, but width direction is mutual by mouth mold width or the restriction effect of annular die circumferential direction, the polymer melt of expansion
It squeezes to form the fold perpendicular to machine direction, seriously affects the surface smoothness of foamed products, width is inhomogenous and leads
Cause yield rate relatively low.
Utility model content
The technical problem to be solved by the utility model is in view of the deficiencies of the prior art, provide a kind of extrusion foaming piece
Head guarantees the stable gas pressure in technical process, it is ensured that foamed products table by the structure setting of polymer melt flow type chamber
Face is smooth, even width is consistent, high yield rate.
Technical problem to be solved in the utility model is achieved by the following technical solution:
A kind of extrusion foaming piece head, including as made of sheet material runner cope plate and sheet material runner lower template fastening
The two sides of polymer melt flow type chamber, the sheet material runner cope plate and sheet material runner lower template are respectively equipped with sheet material
Runner side template, the two sides of the polymer melt flow type chamber are respectively formed with entrance and exit, the polymer molten fluid
Ejector half chamber sequentially forms isometrical area, transition region, shrinking zone and flat region, the transition region on direction from the inlet to the outlet
Sidewall width of the interior melt flow ejector half chamber on the sheet material runner cope plate and sheet material runner lower template is gradually increased, and
The shape of the melt flow ejector half chamber formed on the sheet material runner cope plate and sheet material runner lower template is relative to the two
Buckling surface it is full symmetric.
Specifically, the sidewall shape of melt flow ejector half chamber is arc, the arc and the entrance in the transition region
Horizontal line it is tangent.
Further, the angle between the chord length and the center line at the arc both ends is 5 ° -30 °, preferably
14.5°。
In order to ensure the stable gas pressure in expanding hollow pipe, it is ensured that foaming product surface is smooth, even width is consistent, institute
State the thickness range of melt flow ejector half chamber in transition region are as follows: 10mm-30mm, preferably 20mm.
In order to control the shaping speed of outlet, the angle of throat β of the shrinking zone is 20 ° -110 °.
In addition, the thickness range of the flat region are as follows: 0.1mm-1mm, preferably 0.2mm.
In conclusion the utility model provides a kind of extrusion foaming piece head, pass through the knot of polymer melt flow type chamber
Structure setting, guarantees the stable gas pressure in technical process, it is ensured that foaming product surface is smooth, even width is consistent, high yield rate.
In the following with reference to the drawings and specific embodiments, the technical solution of the utility model is described in detail.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the utility model overall structure cross-sectional view；
Fig. 2 is the A-A cross-sectional view of Fig. 1；
Fig. 3 is the structural schematic diagram of melt flow ejector half chamber in sheet material runner lower template；
Fig. 4 is the B partial enlarged view of Fig. 1.
Specific embodiment
In order to make those skilled in the art better understand the scheme of the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described.
Fig. 1 is the utility model overall structure cross-sectional view；Fig. 2 is the sectional view along A-A of Fig. 1；Fig. 3 is under sheet material runner
The structural schematic diagram of melt flow ejector half chamber in template.Such as Fig. 1 is simultaneously combined shown in Fig. 2, Fig. 3, and the utility model provides a kind of extrusion
Foamed sheet head, including the polymer melt as made of sheet material runner cope plate 100 and the fastening of sheet material runner lower template 200
The two sides of flow model chamber 300, the sheet material runner cope plate 100 and sheet material runner lower template 200 are respectively equipped with sheet material
Runner side template 400, the two sides of the polymer melt flow type chamber 300 are respectively formed with entrance 301 and outlet 302.It is described
Polymer melt flow type chamber 300 sequentially forms isometrical area 310, transition region on from entrance 301 to the direction of outlet 302
320, shrinking zone 330 and flat region 340.The polymer of melting enters polymer melt flow type chamber 300 from entrance 301, first leads to
Cross isometrical area 310, it is generally the case that isometrical area 310 is cylindrical tube road shape, pipe diameter 60mm.The polymer of melting
Behind isometrical area 310, into transition region 320.
As shown in connection with fig. 2, in transition region 320 melt flow ejector half chamber in the sheet material runner cope plate 100 and sheet material
Sidewall width in runner lower template 200 is gradually increased from entrance 301 to 302 directions of outlet, and on the sheet material runner
The shape of the melt flow ejector half chamber formed in template 100 and sheet material runner lower template 200 is complete relative to the buckling surface of the two
Symmetrically.As shown in Fig. 2, specifically, the sidewall shape of melt flow ejector half chamber is arc, the arc in the transition region 320
It is tangent with the horizontal line of the entrance.Further, the angle α between the chord length L and the center line at the arc both ends
It is 5 ° -30 °, preferably 14.5 °.The size of angle α determines the gradual change degree of transition region 320, the more big then melt flows of angle α
The change width of type chamber is faster.In addition, as shown in connection with fig. 1, in order to ensure the stable gas pressure in expanding hollow pipe, it is ensured that foaming produces
Product surfacing, even width are consistent, the thickness range of melt flow ejector half chamber in the transition region 320 are as follows: 10mm-30mm, it is excellent
It is selected as 20mm.In process, polymer melt, which has a large amount of bubble nucleatings and grows, causes polymer melt sharply to expand, edge
The curved wall of 320 two sides of transition region, expand its volume gradually, formed pressure stable and uniform change procedure, meanwhile, by
It is gradually increased in the side wall of melt flow ejector half chamber, fold will not be generated due to causing part to overstock foaming formation.
So, melt not only has velocity component in extrusion direction, also has in width direction during flow model intracavitary flowing
Velocity component, and after melt leaves flow model chamber, the polymer melt of expansion has memory effect in width direction, still can
There is certain velocity component, to weaken mouth mold width to the restriction effect of expanded polymer melt, it is mutual to reduce expanding melt
It squeezes and folds, decrease or even eliminate fold, it is ensured that foaming product surface is smooth, even width is consistent, high yield rate.
Fig. 4 is the B partial enlarged view of Fig. 1.Such as Fig. 4 and referring to figs. 1 and 2, in order to control the shaping speed of outlet,
In transition region 320 close to the position of outlet 302, it is provided with shrinking zone 330.Thickness in shrinking zone 330, melt flow ejector half chamber is fast
Speed reduces, and reduced speed depends on the size for the angle of throat β that the shrinking zone 330 is formed.Under normal conditions, the angle of throat
β is 20 ° -110 °, and angle is bigger, and contraction speed is faster.In the downstream of shrinking zone 330, then flat region 340 is equipped with.Usual situation
Under, the thickness range of the flat region 340 are as follows: 0.1mm-1mm, preferably 0.2mm.The thickness of flat region 340 can pass through tune
Bolt is saved, controls the gap between sheet material runner cope plate 100 and sheet material runner lower template 200 to complete.
Below by way of specific embodiment, the course of work of the utility model is described in detail.
Embodiment one
In the present embodiment, the pipe diameter of the entrance 301 of melt is 60mm, stabilization area thickness 20mm, the outlet of head
302 width are 600mm, and polymer melt flow type chamber 300 is great circle arc, tangent with the horizontal line of entrance 301, arc-shaped two
5 ° of angle is formed between the chord length L and center line C at end, mouth mold exports flat region thickness 0.2mm.Extrusion foaming technique it is specific
The course of work starts after being such that the preheating temperature to set temperature by extrusion system, is added by weight-loss metering system
Polypropylene and nucleating agent, nucleating agent additional amount are the 1wt%, total output 120kg/h of polypropylene total weight.It will by metering pump
Foaming agent CO2It is injected into the melt polypropylene in double screw extruder, injection rate 2wt%.Gradually decrease each section of single screw rod
Temperature, so that gassiness polypropylene melt temperature is reduced to 170 DEG C, out after head, gassiness melt swell obtains after cooling and shaping
Polypropylene foamed sheet.12 times of expansion ratio, foam sheet surfacing, corrugationless.
Embodiment two
In the present embodiment, the pipe diameter of the entrance 301 of melt is 60mm, stabilization area thickness 20mm, the outlet of head
302 width are 600mm, and polymer melt flow type chamber 300 is great circle arc, tangent with the horizontal line of entrance 301, arc-shaped two
14.5 ° of angle is formed between the chord length and center line at end, mouth mold exports flat region thickness 0.2mm.The tool of extrusion foaming technique
Body running process starts after being such that the preheating temperature to set temperature by extrusion system, is added by weight-loss metering system
Enter polypropylene and nucleating agent, nucleating agent additional amount is the 1wt%, total output 120kg/h of polypropylene total weight.Pass through metering pump
By foaming agent CO2It is injected into the melt polypropylene in double screw extruder, injection rate 2wt%.It is each to gradually decrease single screw rod
Duan Wendu, so that gassiness polypropylene melt temperature is reduced to 170 DEG C, out after head, gassiness melt swell, after cooling and shaping
To polypropylene foamed sheet.16.9 times of expansion ratio, foam sheet surfacing, corrugationless.
Embodiment three
In the present embodiment, the pipe diameter of the entrance 301 of melt is 60mm, stabilization area thickness 20mm, the outlet of head
302 width are 600mm, and polymer melt flow type chamber 300 is great circle arc, tangent with the horizontal line of entrance 301, arc-shaped two
30 ° of angle is formed between the chord length and center line at end, mouth mold exports flat region thickness 0.2mm.Extrusion foaming technique it is specific
The course of work starts after being such that the preheating temperature to set temperature by extrusion system, is added by weight-loss metering system
Polypropylene and nucleating agent, nucleating agent additional amount are the 1wt%, total output 120kg/h of polypropylene total weight.It will by metering pump
Foaming agent CO2It is injected into the melt polypropylene in double screw extruder, injection rate 2wt%.Gradually decrease each section of single screw rod
Temperature, so that gassiness polypropylene melt temperature is reduced to 170 DEG C, out after head, gassiness melt swell obtains after cooling and shaping
Polypropylene foamed sheet.13 times of expansion ratio, foam sheet surfacing, corrugationless.
The above description is only the embodiments of the present invention, is not intended to limit the utility model.For this field
For technical staff, various modifications and changes may be made to the present invention.All institutes within the spirit and principle of the utility model
Any modification, equivalent substitution, improvement and etc. of work, should be included within the scope of the claims of the utility model.
In conclusion the utility model provides a kind of extrusion foaming piece head, pass through the knot of polymer melt flow type chamber
Structure setting, guarantees the stable gas pressure in technical process, it is ensured that foaming product surface is smooth, even width is consistent, high yield rate.
Claims (9)
1. a kind of extrusion foaming piece head, including gather made of being fastened as sheet material runner cope plate and sheet material runner lower template
The two sides of polymer melt flow model chamber, the sheet material runner cope plate and sheet material runner lower template are respectively equipped with sheet material stream
The two sides of road side template, the polymer melt flow type chamber are respectively formed with entrance and exit, which is characterized in that the polymerization
Object melt flow ejector half chamber sequentially forms isometrical area, transition region, shrinking zone and flat region, institute on direction from the inlet to the outlet
State in transition region sidewall width of the melt flow ejector half chamber on the sheet material runner cope plate and sheet material runner lower template by
The shape phase for the melt flow ejector half chamber for gradually increasing, and being formed on the sheet material runner cope plate and sheet material runner lower template
It is full symmetric for the buckling surface of the two.
2. extrusion foaming piece head as described in claim 1, which is characterized in that in the transition region side of melt flow ejector half chamber
Wall shape is arc, and the horizontal line of the arc and the entrance is tangent.
3. extrusion foaming piece head as claimed in claim 2, which is characterized in that the chord length at the arc both ends and the center
Angle between line is 5 ° -30 °.
4. extrusion foaming piece head as claimed in claim 3, which is characterized in that the chord length at the arc both ends and the center
Angle between line is 14.5 °.
5. extrusion foaming piece head as claimed in claim 2, which is characterized in that the thickness of melt flow ejector half chamber in the transition region
Spend range are as follows: 10mm-30mm.
6. extrusion foaming piece head as claimed in claim 5, which is characterized in that the thickness of the transition region are as follows: 20mm.
7. extrusion foaming piece head as described in claim 1, which is characterized in that the angle of throat β of the shrinking zone be 20 °-
110°。
8. extrusion foaming piece head as described in claim 1, which is characterized in that the thickness range of the flat region are as follows:
0.1mm-1mm。
9. extrusion foaming piece head as claimed in claim 8, which is characterized in that the thickness range of the flat region are as follows:
0.2mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822006161.8U CN209336053U (en) | 2018-11-30 | 2018-11-30 | Extrusion foaming piece head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822006161.8U CN209336053U (en) | 2018-11-30 | 2018-11-30 | Extrusion foaming piece head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209336053U true CN209336053U (en) | 2019-09-03 |
Family
ID=67750222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822006161.8U Active CN209336053U (en) | 2018-11-30 | 2018-11-30 | Extrusion foaming piece head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209336053U (en) |
-
2018
- 2018-11-30 CN CN201822006161.8U patent/CN209336053U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2461975A (en) | Method of making flattened thermoplastic tubing of predetermined desired characteristics | |
| EP0237900B1 (en) | A method and an apparatus for the production of ribbed pipes | |
| CN104149354A (en) | Production equipment and process for large-diameter biaxial-stretching PVC pipe fitting | |
| CN209336053U (en) | Extrusion foaming piece head | |
| WO1990014208A1 (en) | Method for forming tubing utilizing suction and pneumatic pressure at the surface of the cooling plug | |
| CN204471816U (en) | Online biaxial orientation stretching tube wave character | |
| CN208930677U (en) | Modified ultra-high molecular weight polyethylene plate extrusion die | |
| CN207415939U (en) | A kind of plastic pipe multitube mold runner flow regulator | |
| CN109760333A (en) | Extrusion foaming device screw rod and extrusion foaming device | |
| CN214137269U (en) | Hot cutting machine head for preparing high-concentration master batches | |
| CN208438694U (en) | Rubber composite material forms high homogeneous extrusion device | |
| CN201511513U (en) | Static mixer used by foaming plastic | |
| CN208993037U (en) | A kind of novel double-screw extruder air-dry machine | |
| CN208484065U (en) | For producing the cold palletizing die orifice of polypropylene cooling masterbatch | |
| CN103213265B (en) | The extruder head of the foaming bandlet of supercritical carbon dioxide/polypropylene extruder | |
| CN207207073U (en) | A kind of foaming die and air-cooled internal diameter sizing all-in-one machine | |
| CN107175805A (en) | A kind of PVC self-reinforcings extrusion molding mould | |
| CN204977370U (en) | Extrusion moulding mould of online small -bore tubular product of biaxial orientation plastics | |
| CN207256685U (en) | A kind of PVC solid foams stock mould | |
| CN218256674U (en) | Raw material extrusion structure suitable for high-pressure micro-foaming blow molding | |
| JPS6054850B2 (en) | Thermoplastic resin foam manufacturing method and device | |
| CN208682071U (en) | A kind of extrusion equipment for the UHMWPE tubing directly extruding best bright finish | |
| CN209699815U (en) | A kind of mouth mold water leg accelerating plastic pipe setting | |
| CN208978121U (en) | A kind of foamed profile mold | |
| CN208164278U (en) | A kind of production mold for bottle for cosmetics |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |