CN102765178B - Composite plastic pipe forming die - Google Patents
Composite plastic pipe forming die Download PDFInfo
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- CN102765178B CN102765178B CN201210199415.7A CN201210199415A CN102765178B CN 102765178 B CN102765178 B CN 102765178B CN 201210199415 A CN201210199415 A CN 201210199415A CN 102765178 B CN102765178 B CN 102765178B
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- plastic pipe
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Abstract
The present invention relates to the field of plastic forming die, and aims to provide a composite plastic pipe forming die with adjustable uniformity of wall thickness, wherein incompletely plasticized plastic is easy to be plasticized continuously in the die. The composite plastic pipe forming die comprises a die core, at least two cover dies coaxially sleeved on an outer lower part of the die core, an outer die sleeved outside the die core and the cover die, a shunt, a multistage rectification mechanism and a heating device. The outer body side at the lower part of the die core and the outer body side of the cover die are both equipped with one-head or multi-head spiral grooves; the lower end of the die core, the lower end of the die sleeve and the lower end of the outer die are respectively fixedly connected with the upper end of the shunt; the shunt is provided with inlet channels in a number equal to that of the spiral grooves; each inlet channel communicates with the lower end of one spiral groove; and the upper part of the outer body side of the die core and the upper part of the inner body side of the outer die form an outlet passage. The composite plastic pipe forming die has adjustable uniformity of wall thickness, and incompletely plasticized plastic is easy to be plasticized continuously in the die.
Description
Technical field
The present invention relates to mould for plastics field, the plastics that especially a kind of wall thickness uniformity of pipe can regulate and not plastify completely easily continue the composite plastic pipe formation die of plasticizing in mould.
Background technology
The disclosure of the invention of Chinese patent notification number CN 86108107 a kind of equipment and method that composite construction is moulded pipe of manufacturing of pushing, this equipment is by whole dispensing head, the extrusion equipment that comprises extrusion die and fuse forms, dispensing head is divided into significantly and extrusion equipment three annulus lines converging together, can hold the material of melting; The feed pipeline of fluid diverter; Fuse is comprised of diffusion and condensation type tow conical-tube, all forms a single integral body, and the upstream position of the feed of fluid diverter is directly fixed in extrusion body, without additional any fixing muscle; The equipment that this extruding manufacture composite construction is moulded pipe is multilayer plastic pipe formation die; Current multilayer plastic pipe formation die exists the wall thickness uniformity of pipe can not regulate and not have the plastics of plasticizing completely in mould, to be difficult for continuing the deficiency of plasticizing; Therefore, the wall thickness uniformity that designs a kind of pipe can regulate and not have the plastics of plasticizing completely in mould, easily to continue the composite plastic pipe formation die of plasticizing, becomes problem demanding prompt solution.
Summary of the invention
The object of the invention is to exist in order to overcome current composite plastic pipe formation die the wall thickness uniformity of pipe can not regulate and not have the plastics of plasticizing completely in mould, to be difficult for continuing the deficiency of plasticizing, provide a kind of wall thickness uniformity of pipe can regulate and not have the plastics of plasticizing completely in mould, easily to continue the composite plastic pipe formation die of plasticizing.
Concrete technical scheme of the present invention is:
A composite plastic pipe formation die, comprise at least two cover dies outside core rod bottom of core, coaxial sleeve, be enclosed within external mold outside core and cover die, current divider, for making the uniform multistage deviation correction mechanism of pipe wall thickness and heater; The outer gusset of described core bottom and the outer gusset of cover die are equipped with the helicla flute of or bull; The lower end of the lower end of described core, the lower end of cover die and external mold is fixedly connected with the upper end of current divider respectively; Described current divider is provided with the inlet channel that number equates with spiral fluted number, and each inlet channel is communicated with a spiral fluted lower end; Between the described top of the outer gusset of core and the top of gusset in external mold, form the outlet flow that lower end is communicated with spiral fluted upper end.When this composite plastic pipe formation die is used, the extrusion of the plastic extruder that the other end of the inlet channel that number equates with spiral fluted number equates with spiral fluted number with number of units is respectively communicated with; The plasticizing plastics that each plastic extruder is extruded flow into each helicla flute through each inlet channel respectively, the plastics that do not plastify completely along helicla flute, upwards continue to plastify at a slow speed by the mobile prolongation heat time, the plastics that each layer plastifies are completely at the lower end interflow of outlet flow, have gone out the pipe that outlet flow has just become three-layer plastic pipe; By multistage deviation correction mechanism, regulate the radial thickness of outlet flow, make the even thickness of pipe of the composite plastic pipe extruded not eccentric.The wall thickness uniformity of this composite plastic pipe formation die pipe can regulate and the not plastics of plasticizing easily continuation plasticizing in mould completely.
As preferably, described external mold comprises patrix, middle mould and counterdie; Described multistage deviation correction mechanism comprise upper step groove that the upper end of small end that ladder adjustable ring, scala media ladder adjustable ring, lower adjustable ring, at least six adjustment screw, middle mould inner sides be arranged with and middle mould connects, small end that counterdie inner side is arranged with and counterdie upper end perforation middle step groove and be arranged in the low groove of step groove downside; The width of the described large end of upper step groove and the thickness matching of the large end of upper ladder adjustable ring, the described diameter of the large end of upper step groove and the diameter of small end are greater than respectively the external diameter of the large end of ladder adjustable ring and the external diameter of small end; Described upper ladder adjustable ring is positioned at step groove, the outer gusset of the large end of ladder adjustable ring is withstood in one end of at least two adjustment screw that are uniformly distributed along the circumference through middle mould, adjustment screw is threaded with middle mould, and the lower end of patrix is fixedly connected with the upper end of upper ladder adjustable ring; The thickness matching of the width of the described large end of middle step groove and the large end of scala media ladder adjustable ring, the described diameter of the large end of middle step groove and the diameter of small end are greater than respectively the external diameter of the large end of scala media ladder adjustable ring and the external diameter of small end; Described scala media ladder adjustable ring is arranged in step groove, the outer gusset of the large end of scala media ladder adjustable ring is withstood in one end of at least two adjustment screw that are uniformly distributed along the circumference through counterdie, adjustment screw is threaded with counterdie, and the lower end of middle mould is fixedly connected with the upper end of scala media ladder adjustable ring; The thickness matching of the width of described low groove and lower adjustable ring, the diameter of low groove is greater than the external diameter of lower adjustable ring; Described lower adjustable ring is positioned at low groove, and the outer gusset of lower adjustable ring is withstood in one end of at least two adjustment screw that are uniformly distributed along the circumference through counterdie, and adjustment screw is threaded with counterdie; The top of the interior gusset of the interior gusset of described patrix, middle mould, the interior gusset of counterdie, the interior gusset of upper ladder adjustable ring, the interior gusset of scala media ladder adjustable ring and the interior gusset of lower adjustable ring form the outer gusset of outlet flow.By rotation adjustment screw, can regulate the radial position of ladder adjustable ring, scala media ladder adjustable ring, lower adjustable ring to optimum position, make the even thickness of pipe of the three-layer plastic pipe extruded not eccentric.Multistage deviation correction mechanism is simple in structure easy to adjust and effect is better.
As preferably, the outer gusset at place, the helicla flute place of described core and cover die be shaped as the taper type that large end is positioned at lower end.Completely the plastics of plasticizing can be respectively gap between the interior gusset of the outer gusset of core bottom and cover die at internal layer, streamlined flow fast vertically makes progress in the outer gusset of the cover die of internal layer and the gap between the interior gusset at outer field cover die and the gap between the outer gusset of outer field cover die and the interior gusset of counterdie.
As preferably, described spiral fluted lead angle is 3 degree to 6 degree.Take into account the flow velocity of the plastics of plasticizing and the heating plasticizing time of the plastics that do not plastify completely completely.
As preferably, the depth of thread of described helicla flute lower end is greater than the depth of thread of upper end.Flow velocity while increasing the plastics outflow helicla flute upper end plastifying.
As preferably, the bottom arc transition of described spiral fluted screw thread.Resistance is less.
As preferably, described cover die has two; The spiral fluted head number of the outer gusset of described core bottom and the outer gusset of cover die is four-head or six.Spiral fluted head number is that bull makes the plastics of plasticizing along being circumferentially more evenly distributed.
As preferably, the inlet channel of described current divider has three; Described inlet channel comprises sprue and runner; Described runner is communicated with one end of spiral fluted lower end and sprue respectively.Inlet channel is simple in structure.
As preferably, described runner is the arc groove that is positioned at current divider upper end, and runner also can equate with corresponding spiral fluted head number and one end is positioned at the connecting hole of current divider upper end for number.Make helicla flute charging even.
As preferably, described heater comprises the electric heater at the center that is positioned at core and curls up the electric heating tube outside the outer gusset of external mold.Simple and practical.
Compared with prior art, the invention has the beneficial effects as follows: one. the wall thickness uniformity of this composite plastic pipe formation die pipe can regulate and the not plastics of plasticizing easily continuation plasticizing in mould completely.Two. multistage deviation correction mechanism is simple in structure easy to adjust and effect is better.Three. the outer gusset at place, the helicla flute place of core and cover die be shaped as large end the taper type of lower end make the plastics that plastify completely can be respectively gap between the interior gusset of the outer gusset of core bottom and cover die at internal layer, streamlined flow fast vertically makes progress in the outer gusset of the cover die of internal layer and the gap between the interior gusset at outer field cover die and the gap between the outer gusset of outer field cover die and the interior gusset of counterdie.Four. spiral fluted lead angle is 3 degree to 6 degree, takes into account the flow velocity of the plastics of plasticizing and the heating plasticizing time of the plastics that do not plastify completely completely.Five. the depth of thread of helicla flute lower end is greater than the depth of thread of upper end, the flow velocity while increasing the plastics outflow helicla flute upper end plastifying.Six. the bottom arc transition resistance of spiral fluted screw thread is less.Seven. spiral fluted head number is that bull makes the plastics of plasticizing along being circumferentially more evenly distributed.Eight. inlet channel is simple in structure, and runner is the arc groove that is positioned at current divider upper end, and runner also can equate with corresponding spiral fluted head number and one end is positioned at the connecting hole of current divider upper end for number, make helicla flute charging even.Nine. heater comprises the electric heater at the center that is positioned at core and curls up the electric heating tube outside the outer gusset of external mold, simple and practical.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the top view of current divider in Fig. 1.
In figure: electric heater-1, electric heating tube-2, core-3, cover die-4, external mold-5, patrix-51, middle mould-52, counterdie-53, upper step groove-54, middle step groove-55, low groove-56, current divider-6, helicla flute-7, upper ladder adjustable ring-8, scala media ladder adjustable ring-9, lower adjustable ring-10, adjustment screw-11, outlet flow-12, sprue-13, runner-14.
The specific embodiment
Below in conjunction with shown in accompanying drawing, the present invention is described further.
As shown in accompanying drawing 1, accompanying drawing 2: a kind of composite plastic pipe formation die, comprise at least two cover dies 4 outside core rod bottom of core 3, coaxial sleeve, be enclosed within external mold 5 outside core 3 and cover die 4, current divider 6, for making the uniform multistage deviation correction mechanism of pipe wall thickness and heater.
The lower end of the lower end of described core 3, the lower end of cover die 4 and external mold 5 is connected with the upper end screw of current divider 6 respectively.
Described heater comprises the electric heater 1 at the center that is positioned at core 3 and curls up the electric heating tube 2 outside the outer gusset of external mold 5.
The described outer gusset of core 3 bottoms and the outer gusset of cover die 4 all have the helicla flute 7 of or bull; The lead angle of described helicla flute 7 is 3 degree to 6 degree; In the present embodiment, described cover die 4 has two; A number of the helicla flute 7 of the outer gusset of described core 3 bottoms is four-head, and the number of helicla flute 7 of outer gusset that is positioned at the cover die 4 of internal layer is six, and a number of helicla flute 7 that is positioned at the outer gusset of outer field cover die 4 is four-head; The helicla flute 7 of the outer gusset of described core 3 bottoms and the lead angle of helicla flute 7 that is positioned at the outer gusset of outer field cover die 4 are 5 degree, and the lead angle of helicla flute 7 that is positioned at the outer gusset of outer field cover die 4 is 4 degree; The outer gusset at described core 3 and the helicla flute of cover die 47 places, places be shaped as the taper type that large end is positioned at lower end; The depth of thread of described helicla flute 7 lower ends is greater than the depth of thread of upper end; The bottom arc transition of the screw thread of described helicla flute 7; Described helicla flute 7 is consistent in the degree of depth of sustained height.
Described external mold 5 comprises patrix 51, middle mould 52 and counterdie 53; Described multistage deviation correction mechanism comprise upper step groove 54 that the upper end of ladder adjustable ring 8, scala media ladder adjustable ring 9,10,15 adjustment screw 11 of lower adjustable ring, small end that the interior gusset of middle mould 52 has and middle mould 52 connects, small end that the interior gusset of counterdie 53 has and counterdie 53 upper end perforation middle step groove 55 and be arranged in the low groove 56 of step groove 55 downsides; The width of described upper step groove 54 large ends and the thickness interference fits of upper ladder adjustable ring 8 large ends, described upper step groove 54 diameters of large end and the diameter of small end are greater than respectively the external diameter of ladder adjustable ring 8 large ends and the external diameter of small end; Described upper ladder adjustable ring 8 is positioned at step groove 54, the outer gusset of ladder adjustable ring 8 large ends is withstood in one end of five adjustment screw that are uniformly distributed along the circumference 11 through middle mould 52, adjustment screw 11 is threaded with middle mould 52, and the lower end of patrix 51 is connected with the upper end screw of upper ladder adjustable ring 8; The thickness interference fits of the width of described middle step groove 55 large ends and scala media ladder adjustable ring 9 large ends, described middle step groove 55 diameters of large end and the diameter of small end are greater than respectively the external diameter of scala media ladder adjustable ring 9 large ends and the external diameter of small end; Described scala media ladder adjustable ring 9 is arranged in step groove 55, the outer gusset of scala media ladder adjustable ring 9 large ends is withstood in one end of five adjustment screw that are uniformly distributed along the circumference 11 through counterdie 53, adjustment screw 11 is threaded with counterdie 53, and the lower end of middle mould 52 is connected with the upper end screw of scala media ladder adjustable ring 9; The width of described low groove 56 and the thickness interference fits of lower adjustable ring 10, the diameter of low groove 56 is greater than the external diameter of lower adjustable ring 10; Described lower adjustable ring 10 is positioned at one end of 56, five adjustment screw that are uniformly distributed along the circumference 11 of low groove and through counterdie 53, withstands the outer gusset of lower adjustable ring 10, and adjustment screw 11 is threaded with counterdie 53; Between the described top of core 3 outer gussets and the top of external mold 5 interior gussets, form the outlet flow 12 that lower end is communicated with the upper end of helicla flute 7; The top of interior gusset of the interior gusset of described patrix 51, the interior gusset of middle mould 52, counterdie 53 is, the interior gusset of upper ladder adjustable ring 8, the interior gusset of scala media ladder adjustable ring 9 and the interior gusset of lower adjustable ring 10 form the outer gusset of outlet flow 12.
Described current divider 6 has the inlet channel that number equates with the number of helicla flute 7, and each inlet channel is communicated with the lower end of a helicla flute 7; In the present embodiment, the inlet channel of described current divider 6 has three; Described inlet channel comprises sprue 13 and runner 14; Described runner 14 is communicated with the lower end of helicla flute 7 and one end of sprue 13 respectively; Described runner is the arc groove that is positioned at current divider upper end, and runner also can equate with corresponding spiral fluted head number and one end is positioned at the connecting hole of current divider upper end for number; Be positioned at core 3 bottoms outer gusset helicla flute 7 and be positioned at runner 14 that the helicla flute 7 of the outer gusset of outer field cover die 4 is communicated with for being positioned at the arc groove of current divider 6 upper ends, equate with a number of corresponding helicla flute 7 for number with the runner 14 of helicla flute 7 connections that is positioned at the outer gusset of outer field cover die 4 six and one end are positioned at the connecting hole of current divider 6 upper ends.
When this composite plastic pipe formation die is used, the other end of three sprues 13 is communicated with the extrusion of three plastic extruders respectively, the plasticizing plastics that three plastic extruders are extruded flow into three helicla flutes 7 through three sprues 13 and three runners 14 respectively, the plastics of the plasticizing gap between the outer gusset of core 3 bottoms and the interior gusset at the cover die 4 of internal layer respectively completely, in the outer gusset of the cover die 4 of internal layer and the gap between the interior gusset at outer field cover die 4 and the gap between the outer gusset of outer field cover die 4 and the interior gusset of counterdie 53, straight line upwards flows vertically fast, the plastics that do not plastify completely along helicla flute 7, upwards continue to plastify at a slow speed by the mobile prolongation heat time, three layers of plastics plastifying completely collaborate in the lower end of outlet flow 12, gone out the pipe that outlet flow 12 has just become three-layer plastic pipe, by rotation adjustment screw 11, can regulate the radial position of ladder adjustable ring, scala media ladder adjustable ring 9, lower adjustable ring 10 to optimum position, make the even thickness of pipe of the three-layer plastic pipe extruded not eccentric.
The invention has the beneficial effects as follows: the wall thickness uniformity of this composite plastic pipe formation die pipe can regulate and the not plastics of plasticizing easily continuation plasticizing in mould completely.Multistage deviation correction mechanism is simple in structure easy to adjust and effect is better.The outer gusset at the helicla flute place place of core and cover die be shaped as large end the taper type of lower end make the plastics that plastify completely can be respectively gap between the interior gusset of the outer gusset of core bottom and cover die at internal layer, streamlined flow fast vertically makes progress in the outer gusset of the cover die of internal layer and the gap between the interior gusset at outer field cover die and the gap between the outer gusset of outer field cover die and the interior gusset of counterdie.Spiral fluted lead angle is 4 degree or 5 degree, takes into account the flow velocity of the plastics of plasticizing and the heating plasticizing time of the plastics that do not plastify completely completely.The depth of thread of helicla flute lower end is greater than the depth of thread of upper end, the flow velocity while increasing the plastics outflow helicla flute upper end plastifying.The bottom arc transition resistance of spiral fluted screw thread is less.Spiral fluted head number is that bull makes the plastics of plasticizing along being circumferentially more evenly distributed.Inlet channel is simple in structure, and runner is the arc groove that is positioned at current divider upper end, and runner also can equate with corresponding spiral fluted head number and one end is positioned at the connecting hole of current divider upper end for number, make helicla flute charging even.Heater comprises the electric heater at the center that is positioned at core and curls up the electric heating tube outside the outer gusset of external mold, simple and practical.
It is apparent to one skilled in the art that the present invention can change into various ways, and such change is not thought and departed from the scope of the present invention.All so apparent modifications of the technical staff to described field, within being included in the scope of this claim.
Claims (9)
1. a composite plastic pipe formation die, is characterized in that, comprise at least two cover dies outside core rod bottom of core, coaxial sleeve, be enclosed within external mold outside core and cover die, current divider, for making the uniform multistage deviation correction mechanism of pipe wall thickness and heater; The outer gusset of described core bottom and the outer gusset of cover die are equipped with the helicla flute of or bull; The lower end of the lower end of described core, the lower end of cover die and external mold is fixedly connected with the upper end of current divider respectively; Described current divider is provided with the inlet channel that number equates with spiral fluted number, and each inlet channel is communicated with a spiral fluted lower end; Between the described top of the outer gusset of core and the top of gusset in external mold, form the outlet flow that lower end is communicated with spiral fluted upper end; Described external mold comprises patrix, middle mould and counterdie; Described multistage deviation correction mechanism comprise upper step groove that the upper end of small end that ladder adjustable ring, scala media ladder adjustable ring, lower adjustable ring, at least six adjustment screw, middle mould inner sides be arranged with and middle mould connects, small end that counterdie inner side is arranged with and counterdie upper end perforation middle step groove and be arranged in the low groove of step groove downside; The width of the described large end of upper step groove and the thickness matching of the large end of upper ladder adjustable ring, the described diameter of the large end of upper step groove and the diameter of small end are greater than respectively the external diameter of the large end of ladder adjustable ring and the external diameter of small end; Described upper ladder adjustable ring is positioned at step groove, the outer gusset of the large end of ladder adjustable ring is withstood in one end of at least two adjustment screw that are uniformly distributed along the circumference through middle mould, adjustment screw is threaded with middle mould, and the lower end of patrix is fixedly connected with the upper end of upper ladder adjustable ring; The thickness matching of the width of the described large end of middle step groove and the large end of scala media ladder adjustable ring, the described diameter of the large end of middle step groove and the diameter of small end are greater than respectively the external diameter of the large end of scala media ladder adjustable ring and the external diameter of small end; Described scala media ladder adjustable ring is arranged in step groove, the outer gusset of the large end of scala media ladder adjustable ring is withstood in one end of at least two adjustment screw that are uniformly distributed along the circumference through counterdie, adjustment screw is threaded with counterdie, and the lower end of middle mould is fixedly connected with the upper end of scala media ladder adjustable ring; The thickness matching of the width of described low groove and lower adjustable ring, the diameter of low groove is greater than the external diameter of lower adjustable ring; Described lower adjustable ring is positioned at low groove, and the outer gusset of lower adjustable ring is withstood in one end of at least two adjustment screw that are uniformly distributed along the circumference through counterdie, and adjustment screw is threaded with counterdie; The top of the interior gusset of the interior gusset of described patrix, middle mould, the interior gusset of counterdie, the interior gusset of upper ladder adjustable ring, the interior gusset of scala media ladder adjustable ring and the interior gusset of lower adjustable ring form the outer gusset of outlet flow.
2. composite plastic pipe formation die according to claim 1, is characterized in that: the outer gusset at the place, helicla flute place of described core and cover die be shaped as the taper type that large end is positioned at lower end.
3. composite plastic pipe formation die according to claim 1 and 2, is characterized in that: described spiral fluted lead angle is 3 degree to 6 degree.
4. composite plastic pipe formation die according to claim 1 and 2, is characterized in that: the depth of thread of described helicla flute lower end is greater than the depth of thread of upper end.
5. composite plastic pipe formation die according to claim 1 and 2, is characterized in that: the bottom arc transition of described spiral fluted screw thread.
6. composite plastic pipe formation die according to claim 1 and 2, is characterized in that: described cover die has two; The spiral fluted head number of the outer gusset of described core bottom and the outer gusset of cover die is four-head or six.
7. composite plastic pipe formation die according to claim 1 and 2, is characterized in that: the inlet channel of described current divider has three; Described inlet channel comprises sprue and runner; Described runner is communicated with one end of spiral fluted lower end and sprue respectively.
8. composite plastic pipe formation die according to claim 7, is characterized in that: described runner is the arc groove that is positioned at current divider upper end, runner or equate with corresponding spiral fluted head number and one end is positioned at the connecting hole of current divider upper end for number.
9. composite plastic pipe formation die according to claim 1 and 2, is characterized in that: described heater comprises the electric heater at the center that is positioned at core and curls up the electric heating tube outside the outer gusset of external mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199415.7A CN102765178B (en) | 2012-06-13 | 2012-06-13 | Composite plastic pipe forming die |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199415.7A CN102765178B (en) | 2012-06-13 | 2012-06-13 | Composite plastic pipe forming die |
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| CN102765178A CN102765178A (en) | 2012-11-07 |
| CN102765178B true CN102765178B (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210199415.7A Active CN102765178B (en) | 2012-06-13 | 2012-06-13 | Composite plastic pipe forming die |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104552873B (en) * | 2015-01-07 | 2017-08-22 | 日丰企业集团有限公司 | A kind of compound plastic pipe co-extruding mould of outer layer foaming |
| CN106584880B (en) * | 2017-01-22 | 2019-01-18 | 江苏科技大学 | A kind of biaxial orientation molding machine of polyvinyl chloride pipe |
| CN107351359A (en) * | 2017-07-17 | 2017-11-17 | 苏州金纬管道科技有限公司 | Guide's distributor for plastic extruder |
| CN109910262B (en) * | 2019-04-11 | 2024-01-30 | 四川川东电缆有限责任公司 | Three-layer co-extrusion machine head of bicolor quarter insulated cable |
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Address after: Hangzhou City, Zhejiang province 311100 Linping Yuhang Economic Development Zone No. 111 Tian He Lu Patentee after: Zhejiang two woods machinery limited company Address before: Hangzhou City, Zhejiang province 311100 Linping Yuhang Economic Development Zone No. 111 Tian He Lu Patentee before: Zhejiang Shuanglin Plastic Machinery Co., Ltd. |