CN1326684C - Internal hole shaping method for extruded plastic product - Google Patents
Internal hole shaping method for extruded plastic product Download PDFInfo
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- CN1326684C CN1326684C CNB2003101016530A CN200310101653A CN1326684C CN 1326684 C CN1326684 C CN 1326684C CN B2003101016530 A CNB2003101016530 A CN B2003101016530A CN 200310101653 A CN200310101653 A CN 200310101653A CN 1326684 C CN1326684 C CN 1326684C
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Abstract
本发明挤出塑料制品内孔成型方法，是用挤出机将塑料经过挤出塑化、机头成坯、冷却定型过程得到制品，与现有方法不同之处在于：(1)在机头成坯过程中，采用的机头是一个零件的机头体，机头体的一端与挤出机连接，另一端为出口，出口的内壁形状与管材外形一致；(2)在冷却定型过程中，由冷却介质采用骤冷的方法控制冷却温度。该方法采用的机头体出口的内壁形状为圆形、椭圆形、矩形、方形、三角形或凹凸异型。冷却定型过程采用的冷却介质为水、酒精、干冰或液氮。本发明可以成型微小内孔，不仅能加工圆形的内孔，而且还能加工异型的内孔。机头结构简化为一个零件，机头结构十分简单。
The method for forming the inner hole of the extruded plastic product of the present invention is to use an extruder to obtain the product through the process of extruding and plasticizing the plastic, forming a die into a billet, and cooling and shaping the plastic. The difference from the existing method is: (1) in the die During the billet forming process, the machine head used is a machine head body of a part, one end of the machine head body is connected to the extruder, and the other end is the outlet, and the shape of the inner wall of the outlet is consistent with the shape of the pipe; (2) During the cooling and shaping process , the cooling temperature is controlled by the cooling medium using a quenching method. The shape of the inner wall of the nozzle body outlet adopted by the method is circular, elliptical, rectangular, square, triangular or concave-convex shaped. The cooling medium used in the cooling and setting process is water, alcohol, dry ice or liquid nitrogen. The invention can form tiny inner holes, not only can process circular inner holes, but also can process special-shaped inner holes. The machine head structure is simplified into one part, and the machine head structure is very simple.
Description
Technical field
The present invention relates to use the processing of the little endoporus goods of plastic extruding forming processing method, particularly moulding.
Background technology
Extrusion molding is to have one of main method of the plastic product forming of same cross-sectional, is usually used in the processing and forming of tubing, bar, profile shapes.Be applicable to that tubing extrudes the plastics of processing and be: polyethylene, polypropylene, ethene-vinyl acetate copolymer, polystyrene, polyvinyl chloride, Merlon, acrylonitrile-butadiene-styrene copolymer, polyamide, polyformaldehyde, PET or their blend etc.Usually the extrusion molding of these goods becomes base, cooling and shaping process to obtain goods through extrusion plasticizing, head.In present method, the handpiece structure that moulding endoporus goods are used, two kinds of handpiece structures that the moulding pipe is used for example illustrated in figures 1 and 2, head mainly is made of head connector 1, plug 2, runner transition body 3, pressing plate 4, a mouthful mould 5, plug 2 has shunting support 2A, and plug 2 is provided with air flue 2B.The runner that constitutes between the shunting support 2A of molten plastic via head connector 1, plug 2, runner transition body 3 and mouthful mould 5 and plug 2 from extruder leaves head and forms goods base material, pressing plate 4 is used for regulating the centering of plug 2 and mouthful mould 5, the air flue 2B of plug 2 communicates with atmosphere, obtains the goods blank of required size behind the base material process cooling and shaping device cooling and shaping.Head connector 1 adopts the connection of Hough piece to be connected with extruder by coupling part 1A.In commonsense method, the cooling medium of cooling and shaping is generally water and air, and the temperature range of cooling medium is usually at 10 ℃～60 ℃.Typing mode can adopt freely and finalize the design, finalize the design cover typing, Vacuum shaping etc.When adopting handpiece structure processing tube material products shown in Figure 1, when pipe internal diameter too hour, the plug size is also very little, processing and assembling are all very difficult, therefore, the pipe internal diameter that adopts this method processing is generally more than 10m.Handpiece structure shown in Figure 2, molten plastic is via shunting support 2A, the runner transition body 3 of head connector 1, plug 2,, plug 2 forms goods base material after leaving head, the centre of base material is by air regulating device 6 air feed, pressing plate 4 is used for regulating the centering of the external diameter and the pore of parison, behind the base material process cooling and shaping device cooling and shaping, obtain the goods of required size.Gas among Fig. 2 among the gas passage 2B need accurately be controlled by air regulating device 6.Control the size in goods aperture by controlling the tolerance that feeds gas passage 2B, when this method was processed small-bore tubing, no matter the goods gabarit was any shape, and the endoporus of goods can only be circular.This method needs the special air volume regulating device of a cover, during the processing tubule because narrow-minded, so require the control accuracy of tolerance device 6 to require higher.
Summary of the invention
Hole forming method in the extrusion plastic products of the present invention, become base, cooling and post processing to obtain the tubing finished product through extrusion plasticizing, head in plastics with extruder, different with existing method be in: (1) becomes in the base process at head, the head that adopts is the handpiece body of a part, one end of handpiece body is connected with extruder, the other end is outlet, and the inner wall shape of outlet is consistent with the tubing profile; (2) in the cooling and shaping process, adopt the method control chilling temperature of quenching by cooling medium.
The inner wall shape of handpiece body of the present invention outlet is circle, ellipse, rectangle, square, triangle or concavo-convex abnormal shape.
The cooling medium that cooling and shaping process of the present invention adopts is water, alcohol, dry ice or liquid nitrogen.
Description of drawings
Fig. 1 is the handpiece structure figure of one of prior art processing pipe method:
Fig. 2 is two handpiece structure figure of prior art processing pipe method;
Fig. 3 is the handpiece body structure chart that the present invention processes pipe;
Fig. 4 is the goods endoporus forming process schematic diagram that adopts the inventive method.
In above figure, head connector 1, plug 2, runner transition body 3, pressing plate 4, mouthful mould 5, air regulating device 6, handpiece body 7, bar-shaped parison 8, cooling device 9, curing area 10, endoporus 11, cooling medium 12.
The present invention proposes a kind of interior hole forming method, and the method is utilized molten in plastic extrusion processing Melt the characteristic that plastic cool is shunk, when cooling and shaping, finalize the design by the quenching of control parison cladding material, Inner molten plastic outwards shrinks, and forms endoporus in the middle of material, thereby the endoporus of realizing goods becomes Type. By selecting suitable cooling medium to control the quench temperature condition, thus control endoporus aperture Size. Handpiece structure of the present invention as shown in Figure 3, head be simplified to a part-Handpiece body 7, the inner wall shape of mouth mould 5 outlets among the outlet 7A of handpiece body 7 and Fig. 1 and Fig. 2 Identical, the cross sectional shape of outlet 7A is consistent with the outer shape of tubing goods, the cross section of outlet 7A Shape can be circle, ellipse, rectangle, square, triangle and other concavo-convex abnormal shape, processing The tubing of respective shapes. Forming method of the present invention is particularly useful for processing the micro hole tubing products.
Endoporus forming process of the present invention is that plastics are extruded bar-shaped parison continuously with screw extruder, to type The base skin carries out the rapid sizing and solidifying of quenching, and the parison inner layer material will when cooling curing subsequently Outer wall direction to tubing is shunk, thereby is formed centrally endoporus in parison. The goods endoporus formed Journey as shown in Figure 4, plastics form bar-shaped parison 8 by handpiece body 7, bar-shaped parison 8 is at the cooling dress Put and at first form outer curing area 10 in 9, further cool off in uncured zone, finally becomes fully Curing area is controlled chilling temperature in this process, adopt suitable cooling medium 12 control cooling temperature Degree (chilling temperature can reach-196 ℃ when adopting liquid nitrogen), so that the outer rapid curing of bar-shaped parison, And inner layer material also will progressively solidify under the effect of cooling device, because the material that outer wall has solidified Limited the contraction of inner plastic to the bar center, thus inner layer material in cooling procedure can only to The outer wall direction is shunk, thereby has been formed centrally endoporus 11 in parison.
Method of the present invention (for example: polyethylene is applicable to all plastics that can extrude processing tubing (PE), polypropylene (PP), ethene-vinyl acetate copolymer (EVA), polystyrene (PS), Polyvinyl chloride (PVC), Merlon (PC), acrylonitrile-butadiene-styrene copolymer (ABS), Polyamide (PA), polyformaldehyde (POM), PET or their blend etc.). The shrinkage factor of plastics affects the size of forming hole. For example, the contraction of high density polyethylene (HDPE) (HDPE) Rate is 1.5%～3.5%. If extruding the processing external diameter with the present invention is the tubing of Φ 4mm, formation The theoretical value of endoporus is below 0.75mm. The big I in aperture is by adopting suitable cooling medium And regulate chilling temperature and determine. The temperature of cooling medium will be controlled accurately and evenly, cooling medium can To adopt water, alcohol, dry ice, liquid nitrogen etc.
Adopt the used extruder of method of the present invention and subsidiary engine all can use original equipment, only Change head, adopt the simpler handpiece body of structure, the connected mode of handpiece body and extruder is not yet Use change. Cooling medium replacement is the lower medium of temperature, thereby realizes the type of cooling of quenching. This The forming method of invention has following advantage: (1) can other method of moulding be difficult to the small of moulding Endoporus. (2) handpiece structure is reduced to a part. Head does not need mouthful mould tuningout structure and a plug, Also undesirable gas adjusting device, handpiece structure is very simple. (3) not only can the moulding circular hole, and And can moulding and the profiled holes of goods appearance similar.
The specific embodiment
With Φ 32 * 28 screw extruders (following identical), processing polypropylene tubing, the outlet of mouth mould is Φ 3.6mm, 200 ℃ of die temperatures, tubing hauling speed 3m/min, cooling medium are chilled water, 5 ℃ of water temperatures, under the free typing situation, the external diameter that obtains tubing is that Φ 4.0mm, internal diameter are Φ 0.55mm.
Use high density polyethylene (HDPE), 190 ℃ of die temperatures, tubing speed of production 3m/min, cooling medium are chilled water, 5 ℃ of water temperatures, under the free typing situation, obtaining tube outer diameter is that Φ 4.0mm, internal diameter are Φ 0.4mm.
Use low density polyethylene (LDPE), 190 ℃ of die temperatures, tubing speed of production 3m/min, cooling medium are the alcohol through dry ice cooling, chilling temperature-15 ℃, and under the free typing situation, the tube outer diameter that obtains is that Φ 4.0mm, internal diameter are Φ 0.6mm.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101016530A CN1326684C (en) | 2003-10-28 | 2003-10-28 | Internal hole shaping method for extruded plastic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101016530A CN1326684C (en) | 2003-10-28 | 2003-10-28 | Internal hole shaping method for extruded plastic product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1611343A CN1611343A (en) | 2005-05-04 |
| CN1326684C true CN1326684C (en) | 2007-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101016530A Expired - Fee Related CN1326684C (en) | 2003-10-28 | 2003-10-28 | Internal hole shaping method for extruded plastic product |
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| CN (1) | CN1326684C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008029303A1 (en) * | 2008-06-20 | 2009-12-24 | Bayer Technology Services Gmbh | Screw elements with improved dispersing effect and low energy input |
| CN102514173B (en) | 2011-12-07 | 2014-05-21 | 浙江大学 | Dynamic microchannel plastic extrusion-molding device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2242779Y (en) * | 1995-05-30 | 1996-12-18 | 阜新市红旗塑料机械厂 | Vertical plastic thrust machine |
| CN2318025Y (en) * | 1997-03-04 | 1999-05-12 | 刘洪晓 | Extruding forming machine for double-mould-head plastic foaming net |
| CN2353510Y (en) * | 1999-03-15 | 1999-12-15 | 王文锦 | Formation device for silencing tube with crowning spiral ribs on foamed internal wall or core layer |
| CN2361455Y (en) * | 1997-12-30 | 2000-02-02 | 上海斯尼特塑钢有限公司 | Fibre reinforced extrusion plastic bar with decorative surface |
| CN1377764A (en) * | 2001-03-27 | 2002-11-06 | 宇部日东化成株式会社 | Method and device for producing synthetic resin stick article |
-
2003
- 2003-10-28 CN CNB2003101016530A patent/CN1326684C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2242779Y (en) * | 1995-05-30 | 1996-12-18 | 阜新市红旗塑料机械厂 | Vertical plastic thrust machine |
| CN2318025Y (en) * | 1997-03-04 | 1999-05-12 | 刘洪晓 | Extruding forming machine for double-mould-head plastic foaming net |
| CN2361455Y (en) * | 1997-12-30 | 2000-02-02 | 上海斯尼特塑钢有限公司 | Fibre reinforced extrusion plastic bar with decorative surface |
| CN2353510Y (en) * | 1999-03-15 | 1999-12-15 | 王文锦 | Formation device for silencing tube with crowning spiral ribs on foamed internal wall or core layer |
| CN1377764A (en) * | 2001-03-27 | 2002-11-06 | 宇部日东化成株式会社 | Method and device for producing synthetic resin stick article |
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| Publication number | Publication date |
|---|---|
| CN1611343A (en) | 2005-05-04 |
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Application publication date: 20050504 Assignee: Hunan Plastic Technology Co., Ltd. Assignor: Beijing University of Chemical Technology Contract record no.: 2010430000018 Denomination of invention: Internal hole shaping method for extruded plastic product Granted publication date: 20070718 License type: Exclusive License Record date: 20100415 |
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Granted publication date: 20070718 Termination date: 20151028 |
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