CN101168286B - Chlorinated polyvinyl chloride DN400 elbow pipe fitting once injection moulding technique and device thereof - Google Patents
Chlorinated polyvinyl chloride DN400 elbow pipe fitting once injection moulding technique and device thereof Download PDFInfo
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- CN101168286B CN101168286B CN2006101506567A CN200610150656A CN101168286B CN 101168286 B CN101168286 B CN 101168286B CN 2006101506567 A CN2006101506567 A CN 2006101506567A CN 200610150656 A CN200610150656 A CN 200610150656A CN 101168286 B CN101168286 B CN 101168286B
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Abstract
The invention relates to a manufacturing technique of a wood-gum tubular element, in particular to a disposable injection molding technique and device of a CPVC bent tubular element. The technique comprises technical processes of charge mixture, drying, injection molding, pressure maintaining and open modeling, wherein a heating position of a charging barrel of an injection machine is divided into seven segments in the process of injection, the temperature ranges of the segments are respectively 150-155 DEG C, 168-173 DEG C, 162-167 DEG C, 160-165 DEG C, 155-160DEG C, 150-155 DEG C, and 145-150DEG C, and the temperature of a mould is controlled between 60 and 70 DEG C. When injecting, pressures of ejection is divided into three segments which are respectively 58 MPa, 65 MPa and 80 MPa. The pitch of screw of a screw rod of the injection machine used by the method is equal to the diameter of the screw rod, a feeding segment takes up 25 percent of the total length, a compression segment takes up 50 percent of the total length, and a homogenizing segment takes up 25 percent of the total length. The invention achieves the disposable injection molding of a DN400 large-scale bent tubular element via the improvement of the technique and the device.
Description
Technical field
The present invention relates to a kind of production technology of resin tube, be specially a kind of chliorinated polyvinyl chloride bend pipe tools once injection moulding technique and equipment thereof.
Background technology
PVC-C (chliorinated polyvinyl chloride) is generated by the chlorination of PVC free radical, and general chlorinity is 63%～69%, the reacting dose of different chlorination mode, state and chlorine, and the PVC-C of generation has very big difference.Its chlorination reaction process is as follows:
Start:
Increase and spread out: RH+Cl → R+HCl
R+Cl
2→RCl+Cl
Stop: R+Cl → RCl
Cl+Cl→Cl
2
R+R→R
2
(RH represents PVC, → expression heating)
PVC-C is exactly the chlorination reaction mechanism according to above-mentioned PVC free radical, controls the chlorinity of a certain ratio, and technological factors such as control start-up temperature make, and its chlorinity is up to 74%, and vicat softening point temperature is 123 ℃.Conceptive PVC-C is formed through superchlorination by PVC simple substance condensate, has become very important engineering plastic materials.
The DN400 bend pipe tools is meant that nominal diameter is 400 large-scale bend pipe tools, when adopting existing technology that DN400 elbow series pipe fitting is carried out once injection moulding, often there are the following problems: (1) since PVC-C (chliorinated polyvinyl chloride) resin raw material than great, screw in injection molding machine moment of torsion that produces in preformed has surpassed the designing requirement of master screw; (2) PVC-C (chliorinated polyvinyl chloride) resin chlorinty height, the temperature controlling range deviation is little, and the frictional heat that screw rod produces in preformed is difficult to control, so required preformed time of DN400 bend pipe tools is long, and material is easy to burn in machine barrel; (3) PVC-C (chliorinated polyvinyl chloride) resin good toughness, impact strength height, cut off greatly, injection machine oil motor rotating speed produces wild effect when preformed in process.For above-mentioned reasons, by prior art, technology, can't solve the single injection-molded problem of DN400 elbow series pipe fitting.Therefore, use PVC-C sheet material in the prior art usually, come the pipe fitting of substituting disposable moulding by welding through twice moulding process.The requirement that pressure, the temperature that post forming DN400 elbow is born in the engineering use do not reach the ISO1543 standard.
Summary of the invention
The objective of the invention is to defective, a kind of technology and equipment thereof that can carry out once injection moulding to the chliorinated polyvinyl chloride bend pipe tools is provided at chliorinated polyvinyl chloride DN400 elbow series existing difficulty of pipe fitting single injection-molded and prior art.
Technical scheme of the present invention is as follows: chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding technique, comprise batching, oven dry, injection moulding, pressurize, die sinking technical process, wherein, in injection moulding process, injecting machine material tube heating position is divided into seven sections, every section is heated separately by heating collar, temperature range is respectively 150～155 ℃, 168～173 ℃, 162～167 ℃, 160～165 ℃, 155～160 ℃, 150～155 ℃, 145～150 ℃, and mold temperature is controlled between 60～70 ℃; The pressure of injecting during injection moulding is divided into three sections, is respectively 58MPa, 65MPa and 80MPa.
Aforesaid chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding technique, wherein, the plasticizing pressure of screw in injection molding machine top material is 135MPa.
The used equipment of above-mentioned chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding technique is injection machine, comprise body and the hopper that is arranged on the body, the hopper below is provided with machine barrel and screw rod, screw rod is connected with oil motor, and machine barrel the place ahead is provided with quiet template and moving platen, wherein, the pitch of described screw rod equals screw diameter, the feeding section accounts for 25% of total length, and the compression section accounts for 50% of total length, and homogenizing zone accounts for 25% of total length.
Aforesaid chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding equipment, wherein, the preceding groove radius of described screw rod is 10% of a screw diameter, back groove radius is 25% of a screw diameter.
Aforesaid chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding equipment, wherein, the groove spiral shell angle of described screw rod is 17.7 °.
Aforesaid chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding equipment, wherein, used oil motor is the oil motor of 32000 discharge capacities.
The reasonable control of the present invention injection pressure and plasticizing pressure by to injecting machine material tube heating-up temperature, mold temperature, injection moulding the time has alleviated PVC-C in single injection-molded, and the cut off power of material in machine barrel has guaranteed the final performance of goods; By particular design to screw in injection molding machine, improved the defective that original diameter sudden change shape screw rod friction temperature height, material are easy to burn, alleviated the frictional heat of PVC-C material when machine barrel plastifies; By use to high-power oil motor, make PVC-C material stabilization of speed when preformed, make material arrhea the fusion time that the time one reaches raw material standard surely at machine barrel, can not form and burn phenomenon.
Description of drawings
Fig. 1 is the structural representation of the used injection machine of the present invention.
Fig. 2 is the structural representation of screw rod.
Fig. 3 is a Shooting Technique flow chart of the present invention.
Fig. 4 is an injecting machine material tube mode of heating schematic diagram.
Among the figure, 1. 5. quiet template 6. moving platens 7. pull bars of body 2. oil motors 3. hoppers 4. machine barrels (in establish screw rod)
The specific embodiment
Chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding technique comprises following technical process:
1, PVC-C (chliorinated polyvinyl chloride) raw material
2, drying baker, 4 hours raw material drying time, temperature is 80～90 ℃
3, injection mo(u)lding
4, pressurize
5, cooling
6, die sinking
7, check
8, warehouse-in
Technological parameter related in the method is as follows:
Barrel temperature during selection, should guarantee that the plastics plasticizing is good, do not cause again in the time of realizing injecting smoothly that material decomposes, in injection moulding process, injecting machine material tube heating position is divided into seven sections, its position evenly arranges, every section is heated separately by heating collar, and the barrel zone temperature of its selection is following to see Table one:
Table (one)
| One | Two | Three | Four | Five | Six | Seven |
| 150-155 ℃ | 168-173 ℃ | 162-167 ℃ | 160-165 ℃ | 155-160 ℃ | 150-155 ℃ | 145-150 ℃ |
Mold temperature is that plastic parts moulding cycle and Products Quality (as internal stress, shrinkage factor, dimensional tolerance, presentation quality, mechanical performance etc.) are had material parameter, by control heating collar position, and feeds back its temperature through the thermo detector at position, place; If being lower than this is provided with temperature and will starts heater; Reduce its temperature if will start its air-blast device above this temperature, mold temperature generally is controlled between 60～70 ℃.
Injection pressure plays a decisive role to the plastics mold filling, and pressure size and dwell time etc. then influence the final performance of goods, the selected injection pressure of PVC-C, 58,65,80Mpa.
Injection speed is meant the calculated value of screw plunger in the injection translational speed, and injection rate is the theoretical content that melt penetrates from nozzle in the representation unit time.Final position is meant to show as on injection machine and penetrates the final position that retreats, realizes control with limit switch.The relation of injection pressure and final position as shown in Table 2.
Table (two)
| Injection pressure (Mpa) | Inject time (s) | Final position (mm) | |
| One | 58 | 12 | 480 |
| Two | 65 | 20 | 390 |
| Three | 80 | 4 | 5 |
Produce the DN400 bend pipe tools, the screw in injection molding machine top material of selected 40000 gram volumes rotates pressure suffered when retreating at screw rod, is called plasticizing formula back pressure, and its big I is adjusted by the overflow valve of hydraulic pressure system stream.The selected pressure of PVC-C is following to see Table three:
Table (three)
The used equipment of above-mentioned chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding technique is injection machine, comprise body 1 and the hopper 3 that is arranged on the body 1, hopper 3 belows are provided with machine barrel 4 and screw rod, screw rod is connected with oil motor 2, and machine barrel 4 the place aheads are provided with quiet template 5 and moving platen 6, wherein, the pitch of described screw rod equals screw diameter, the feeding section accounts for 25% of total length, and the compression section accounts for 50% of total length, and homogenizing zone accounts for 25% of total length; The preceding groove radius of screw rod is 10% of a screw diameter, and back groove radius is 25% of a screw diameter, and the groove spiral shell angle of screw rod is 17.7 °.
The concrete parameter of screw rod is as shown in Table 4:
Table (four)
PVC-C DN400 bend pipe tools torque is big.The oil motor of 32000 discharge capacities has been installed on 40000 myriagram injection machines, has been made the PVC-C material, made material arrhea the fusion time that the time one reaches raw material standard surely, can not form and burn phenomenon at machine barrel giving stabilization of speed when moulding.
Claims (2)
1. chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding technique, comprise batching, oven dry, injection moulding, pressurize, die sinking technical process, it is characterized in that: in injection moulding process, injecting machine material tube heating position is divided into seven sections, every section is heated separately by heating collar, temperature range is respectively 150～155 ℃, 168～173 ℃, 162～167 ℃, 160～165 ℃, 155～160 ℃, 150～155 ℃, 145～150 ℃, and mold temperature is controlled between 60～70 ℃; The pressure of injecting during injection moulding is divided into three sections, is respectively 58MPa, 65MPa and 80MPa.
2. chlorinated polyvinyl chloride DN 400 elbow pipe fitting once injection moulding technique as claimed in claim 1 is characterized in that: the plasticizing pressure of screw in injection molding machine top material is 135MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101506567A CN101168286B (en) | 2006-10-23 | 2006-10-23 | Chlorinated polyvinyl chloride DN400 elbow pipe fitting once injection moulding technique and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101506567A CN101168286B (en) | 2006-10-23 | 2006-10-23 | Chlorinated polyvinyl chloride DN400 elbow pipe fitting once injection moulding technique and device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101168286A CN101168286A (en) | 2008-04-30 |
| CN101168286B true CN101168286B (en) | 2010-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101506567A Expired - Fee Related CN101168286B (en) | 2006-10-23 | 2006-10-23 | Chlorinated polyvinyl chloride DN400 elbow pipe fitting once injection moulding technique and device thereof |
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|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102635739B (en) * | 2012-02-07 | 2013-08-07 | 常熟市谷雷特机械产品设计有限公司 | Manufacture method of composite pipeline used for building |
| CN111662399B (en) * | 2019-03-05 | 2024-08-13 | 潘连山 | Novel nano alloy plastic water pump elbow and manufacturing process thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2526153Y (en) * | 2002-03-19 | 2002-12-18 | 蔡桂森 | Injection molder |
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2006
- 2006-10-23 CN CN2006101506567A patent/CN101168286B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2526153Y (en) * | 2002-03-19 | 2002-12-18 | 蔡桂森 | Injection molder |
Non-Patent Citations (1)
| Title |
|---|
| 张海,赵素合.橡胶及塑料加工工艺 1.化学工业出版社,1997,234-236. * |
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