CN107504306A - The manufacture method of the straight mouth reducing T of PVC straight pipes, PVC - Google Patents

The manufacture method of the straight mouth reducing T of PVC straight pipes, PVC Download PDF

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Publication number
CN107504306A
CN107504306A CN201710664083.8A CN201710664083A CN107504306A CN 107504306 A CN107504306 A CN 107504306A CN 201710664083 A CN201710664083 A CN 201710664083A CN 107504306 A CN107504306 A CN 107504306A
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tube
pvc
barrel
area
shape thing
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CN201710664083.8A
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CN107504306B (en
Inventor
叶品华
季红生
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Wahson Pipeline Technology Co Ltd
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Wahson Pipeline Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/02—Branch units, e.g. made in one piece, welded, riveted
    • F16L41/021—T- or cross-pieces
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08L27/06—Homopolymers or copolymers of vinyl chloride
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76531—Temperature
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76658—Injection unit
    • B29C2945/76668—Injection unit barrel
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76658—Injection unit
    • B29C2945/76688—Injection unit nozzle
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/24—Pipe joints or couplings
    • B29L2031/246—T-joints
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Abstract

The present invention relates to a kind of PVC straight pipes, the manufacture method of the straight mouth reducing Ts of PVC, including the following steps：Tube is cut into the length and angle of requirement using multi-angle electric tube cutter；The tube of well cutting is placed on welding machine clamp and fixed；By the end face processing to be welded of 2 tubes to flat smooth；End face is closed up, checks centering situation, two contact surface misalignments to be welded are no more than the 10% of wall thickness, are otherwise adjusted and are handled again to flat smooth using the chucking power of fixture；Between bonding machine heating plate is placed in into two pipe ends, starting progressively to apply pressure P1 within the t1 times makes pipe end pressure heat on hot plate, and pressure is gradually reduced after uniform bead is formed to P2 and is maintained at P2 and is absorbed heat；Pipe end is unclamped, takes out heating plate, then close up pipe end；P1 is progressively forced into since 0 so that pipe welding position to being respectively formed uniform flange from inside to outside；Pressure P1 is kept, makes welding position natural cooling.

Description

The manufacture method of the straight mouth reducing T of PVC straight pipes, PVC
Technical field
The present invention relates to tubing technical field, more particularly to a kind of sweat soldering pvc pipe, Pipe joints and their manufacturing methods.
Background technology
Plastic conduit is as a kind of new chemical building material at present, because its have it is in light weight, easy for installation, corrosion-resistant Many advantages, such as, it has been widely used in the fluid conveying in each field.
PVC pipeline is the principal item in plastic conduit, its compared to more other plastic conduits have higher intensity and Raw material sources are extensively and the advantages that relative low price, are development and application relatively morning and to be always maintained at good ecology potential in plastic conduit The kind of head, in terms of the research and development of PVC pipeline, manufacturing enterprise suffers from keen interest in one's power for each Research Center.
The tensile strength of PVC pipeline can reach more than 50MPa, and PE pipelines only have 23MPa, and PP pipelines at most also can only achieve 35MPa.The synthetic route of PVC raw materials has ethylene process synthetic route and acetylene method synthetic route, and the raw material of ethylene process is oil, is Petrochemical industry route；The raw material of acetylene method is calcium carbide, is Coal Chemical Industry Route.China's oil is relatively nervous, and the reserves of coal are relative Compare abundant, with the continuous development of technology, China's carbide production PVC technology has obtained significant progress, and price is than only PE, PP raw material that can be produced by petrochemical industry are cheap a lot.
At present, PVC is extruding-out process, pipe fitting（Pipe joint）To be molded one-shot forming technique.In recent years, PVC Effective amount constantly increases, and bore is also constantly expanding, and the PVC bore of extrusion molding has reached 1600mm, but due to Being limited to by technical reasons such as injection-moulding device, moulds, PVC injection one-shot forming pipe fittings can only typically accomplish below 200mm, The country only has a small number of enterprises to accomplish 500mm bores, therefore large diameter pipeline can only use the metal materials such as steel, cast iron.By In tubing, the unlike material of pipe fitting, the development of PVC pipeline is also objectively limited.
Also run into the evolution of the polyolefin pipes such as PE, PP large-caliber pipe fittings directly can not ask in injection molding Topic, is well solved in actual use by using the method for tubing sweat soldering.
But PVC material can deviate from HCL at high temperature and decompose, and its decomposition temperature connects very much with processing and forming temperature Closely, and because PVC is amorphous amorphous materials, the fusing point do not fixed, stable melting can not be formed in heating Region and form good welding, so PVC pipeline is big to produce there is presently no successfully realizing using the method for sweat soldering Bore pipe fitting.
Chinese patent literature CN101112792A discloses a kind of PVC-M pipe hot melting and connecting methods, and it is by polyvinyl chloride Tubing carries out join by fusion on butt fusion welding machine, and uses following steps：A. tubing to be welded or pipe fitting are fixedly clamped in machine On frame, locked joints part, two pipe joints and the dirt of end are removed；B. preheat, preheating temperature is 25~35 DEG C；C. dock End surface carries out milling, its gap value is not more than 0.3mm；D. tubing axiality is checked, its maximum unfitness of butt joint is no more than tubing The 5% of wall thickness；E. temperature of heating plate is heated to 210~230 DEG C, and ensures that whole temperature of heating plate is uniform, then will heating Plate is placed in frame, closes fixture；F. pressurization operation, initialization system pressure P1=P0+ heated pressures, heating, pressurization are heated；g. Heat absorption process, pressure is reduced to P2, P2=P0+ heat absorption pressure, its numerical value is motoring pressure, whole heat absorption with pressure, is absorbed heat the time For 30~120 seconds；H. refrigerating work procedure, fixture is opened, removes heating plate, rapid closing fixture, and evenly arrive pressure regulation P3, P3=P0+ cooling pressure, begin to cool down, and cool time is 10~30 minutes；I. pressure is reduced to zero, opens fixture, remove Weld tubing or pipe fitting.It also disclose in detail：In step g, " 12. treat pipe way projection uniformly, and flange height reach will To be P2 by pressure when asking（It is approximately motoring pressure）, and absorbed heat, the start recording heat absorption time：P2=P0+ heat absorption pressure （Pressure of absorbing heat is almost nil）", and P0 is motoring pressure, then P2 is motoring pressure, and motoring pressure is dragging pipe in machine The minimum slip frictional force moved on frame, above-mentioned welding method and the sweat soldering of PE materials are completely the same, the technical scheme with It is disclosed《PE polyethylene pipe hot melt weld job guiding books》Described scheme is identical：Particularly applied in heat absorption process Add motoring pressure.But because PVC material is amorphous substance, the fusing point do not fixed, this point exists essential obvious with PE materials Difference：PE materials possess fixed fusing point, therefore PVC material can not be formed surely when with heater plate as PE materials Fixed melt region.Due to conduction of heat, the temperature of tube heating gradually drops along the increase with heated end face distance Low, the softness number of respective material is also gradually to reduce.It is actually formed what one section of melt strength degree gradually increased in endothermic process The softening section of uneven fusing, in subsequent pressurization docking, the softening section of this uneven fusing is extremely unstable, it is possible to Warpage on the inside of tube wall, it is also possible to which warpage on the outside of to tube wall, this irregular warpage can make soldering opening form dislocation and round tube Shape alteration of form, that is, good welding can not be formed, therefore PVC sweat soldering technology is not accomplished always, so as to Limit application of the PVC in large diameter pipeline field.And in above-mentioned patent CN101112792A disclosures, absorbing heat What the stage still took is application P (drag) the i.e. motoring pressure consistent with the sweat soldering of PE materials, and this is the PE materials of standard Welding procedure, can be inquired in the open materials such as each class standard, because PVC is without solid for PVC sweat soldering Determine this characteristic of solder joint therefore can not effectively implement at all, the heat-melting butt-joint of pvc pipe can not be realized in practice：PE materials In the welding procedure of material, considering for motoring pressure is that PE tubing is very because the sweat soldering of PE tubing is substantially field operation Long, substantially all more than 10 meters, therefore sweat soldering needs to consider scene dragging when longer tubing welds during field operation When the minimum slip frictional force, this is to consider the pressure that execute-in-place environment is done, motoring pressure very little, and P1 is dragging pressure 40 to 120 times of power, it is definitely not to apply the sweat soldering that motoring pressure can be achieved with PVC in PVC welding procedure.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of achievable PVC pipe is big particularly more than diameter 200mm The welding of bore PVC pipe and the preferable PVC straight pipes of welding effect, the manufacture method of the straight mouth reducing Ts of PVC.
Realize that one of technical scheme of the object of the invention is to provide the manufacture method of the straight mouth reducing Ts of PVC, it is described The straight mouth reducing Ts of PVC are straight mouth, R mouths or the straight mouth reducer tees of flat enlarging PVC made of the vertical welding of two sections of pvc pipe shape things Joint, including 1 the first single end head leads directly to tube, 1 Double-end leads directly to tube, flanging and in-flanges, first is single It is that one end is straight mouth that termination, which leads directly to tube, and the other end is the pvc pipe shape thing of straight mouth, R mouths or flat enlarging；Double-end leads directly to tubulose Thing is the pvc pipe shape things that both ends are all straight mouth, R mouths or flat enlarging；First single end head leads directly to tube and leads directly to tubulose with Double-end Thing reducing；First single end head leads directly to tube and leads directly to the axially middle part vertical connection of tube with Double-end and be welded to connect one Rise, and the first single end head leads directly to tube and leads directly to tube insertion with Double-end, the first single end head leads directly to tube and Double-end Straight-through tube passes through the annular flanging positioned at periphery formed due to welding and the annular in-flanges positioned at inner side Link together；
The manufacture method of the straight mouth reducing Ts of PVC is：
1. the pvc pipe shape thing of corresponding extrusion or injection molding is chosen according to product specification, using multi-angle electric tube cutter by pvc pipe The length that shape thing cuts into requirement obtains the straight-through tube of the first single end head and the straight-through tube of Double-end；Again basis is sawed with arc The external diameter that Double-end leads directly to tube handles to obtain the end to be welded of arc surfaced to the straight mouth end of the straight-through tube of the first single end head Face；
2. 1. the first single end head that step is obtained leads directly to tube and Double-end leads directly to tube and is placed on welding machine clamp simultaneously Fix, the axially middle part that the first single end head leads directly to tube and the straight-through tube of Double-end is vertically arranged；
3. end face is closed up, centering situation is checked, checks that the first single end head leads directly to the contact surface to be welded of the arc surfaced of tube Whether the contact surface to be welded that the axially middle part of tube is led directly to Double-end is aligned, and is such as otherwise adjusted using the chucking power of fixture It is whole；
4. between bonding machine heating plate is placed in into two contact surfaces to be welded, starting progressively to apply pressure P1 within the t1 times makes pipe end pressure Heat on hot plate, wherein welding temperature：200~250 DEG C；Pressure is gradually reduced to P2 after uniform bead is formed and is protected Hold and absorbed heat in P2, the heat absorption time is t2；
5. within the t3 times, pipe end is unclamped, takes out heating plate, then close up pipe end；
6. and then within the t4 times P1 is progressively forced into since 0 so that uniformly turn over to being respectively formed from inside to outside pipe welding position Side；
7. keeping pressure P1 within the t5 times, welding position is set to naturally cool to less than 60 DEG C；
8. the first single end head to link together is led directly into tube and Double-end to lead directly to after tube takes out, by hole making drill from The straight-through tube of first single end head stretches into leads directly to perforate on the tube wall of tube in Double-end, so as to obtain the straight mouths of the PVC of insertion Reducing T；
Wherein, P1：Pressure as defined in welding, P1=（0.15±0.01）A/B, A represent that the first single end head leads directly to the section of tube Long-pending, the total effective area of piston in the hydraulic cylinder of B expression bonding machines, unit is square millimeter；
P2：Holding pressure during heat absorption, P2=0.5~0.8P1,
t1：The time formed required for uniform bead, unit are the second, and t1 size is observed to form uniform weldering according to execute-in-place The duration change of pearl；
t2：The heat absorption time required for welding, unit is the second, t2=tube wall thickness * 10, and tube wall thickness unit is millimeter；
t3：Switch the time of defined, unit is the second, 1≤t3≤13；
t4：Adjust pressure to the time of P1 defineds, unit be the second, 1≤t4≤18；
t5：Cool time, unit are minute, 10≤t5≤120.
Further, step 1. in, the preparation method of the pvc pipe shape thing of the extrusion molding is as follows：It is described to be used to prepare The formula of the parts by weight of extrusion molding pvc pipe shape thing is as follows：100 parts of polyvinyl chloride resin, 0.4~4.5 part of stabilizer, oxidic polyethylene 0.4~1.0 part of wax, 0~0.8 part of Tissuemat E, 0~1.0 part of paraffin, 0~0.8 part of stearic acid, 0.1~0.5 part of calcium stearate, 0~3.0 part of acrylate, 0~5.0 part of haloflex, 0~4.0 part of MBS auxiliary agents, 1.0~15.0 parts of calcium carbonate, titanium dioxide 0.2~3.0 part；
The preparation technology of the extrusion molding pvc pipe shape thing comprises the following steps：It is used to prepare extrusion molding pvc pipe according to above-mentioned The formula of the parts by weight of shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, when mixing temperature is to 120 DEG C Be put into cold mixing machine, released when cold mixing is to 60 DEG C it is stand-by, by the material mixed addition twin-screw tube extrusion production line squeeze Go out shaping, tubing is cut into the length of requirement, if flared pipe fitting need to be made, enlarging is carried out with pipe-expanding machine：Flat mouth or R Mouthful；Expressing technique temperature：170~190 DEG C of 1st area of barrel, 160~180 DEG C of 2nd area of barrel, 150~170 DEG C of 3rd area of barrel, the area of barrel 4 140~160 DEG C, 140~160 DEG C of connector, 140~190 DEG C of mould, temperature is incremented by from connector to mouth mold, generally forms two Head height, middle low Temperature Distribution.
Further, step 1. in, the preparation method of the pvc pipe shape thing of the extrusion molding is as follows：It is described to be used to prepare The formula of the parts by weight of injection molding pvc pipe shape thing is as follows：100 parts of polyvinyl chloride resin, 0.4~4.5 part of stabilizer, oxidic polyethylene 0.2~0.5 part of wax, 0~0.5 part of Tissuemat E, 0~0.6 part of paraffin, 0~0.5 part of stearic acid, 0.5~2.0 part of calcium stearate, 0~3.0 part of acrylate, 0~5.0 part of haloflex, 0~4.0 part of MBS auxiliary agents, 1.0~15.0 parts of calcium carbonate, titanium dioxide 0.2~3.0 part；
The preparation technology of the injection molding pvc pipe shape thing comprises the following steps：It is used to prepare injection molding pvc pipe according to above-mentioned The formula of the parts by weight of shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, when mixing temperature is to 120 DEG C Be put into cold mixing machine, released when cold mixing is to 60 DEG C it is stand-by, by the material mixed add double screw extruder be granulated, made Particle input injection machine shaping；It is granulated expressing technique temperature：160~180 DEG C of 1st area of barrel, 150~170 DEG C of 2nd area of barrel, barrel 3 140~160 DEG C of area, 130~150 DEG C of 4th area of barrel, 130~150 DEG C of connector, 130~170 DEG C of mould, temperature from connector to Mouth mold is incremented by, and generally forms two head heights, middle low Temperature Distribution；Injection molding temperature：170~190 DEG C of nozzle, the area of barrel 1 165~185 DEG C, 160~180 DEG C of 2nd area of barrel, 160~175 DEG C of 3rd area of barrel, 160~170 DEG C of 4th area of barrel, injection temperature is from adding Material section to nozzle gradually rises.
Further, the step 4. in welding temperature be 230~250 DEG C.
Realize that the two of the technical scheme of the object of the invention is to provide a kind of manufacture method of PVC straight pipes, the PVC is led directly to Pipe is directly mouth, R mouths or flat enlarging PVC straight pipes, including 2 the first single end head straight pipes made of two sections of pvc pipe shape thing welding Shape thing, flanging and in-flanges, it is that one end is straight mouth that the first single end head, which leads directly to tube, and the other end is straight mouth, R mouths or flat expansion The pvc pipe shape thing of mouth；2 the first single end heads lead directly to tube level and are oppositely arranged and are welded together, by due to weldering Connect the annular flanging positioned at periphery to be formed and the annular in-flanges positioned at inner side links together；
The manufacture method of the PVC straight pipes：
1. the pvc pipe shape thing of corresponding extrusion or injection molding is chosen according to product specification, using multi-angle electric tube cutter by pvc pipe The first single end head that shape thing cuts into length 2 unified specifications of acquisition of requirement leads directly to tube；
Weld on machine clamp and fix 2. the first single end head of well cutting is led directly into tube and is placed in, 2 the first single end heads are straight The logical horizontal face of tube is set；
3. 2 the first single end heads are led directly to the end face processing to be welded of the pipe end of tube to flat smooth to meet welding requirements Suitable for coincideing：The contact surface to be welded of two pipe ends is planished to uniform to go out to consider to be worth doing with the planing tool on bonding machine；
4. end face is closed up, centering situation is checked, two contact surface misalignments to be welded are no more than the 10% of wall thickness, otherwise utilize fixture Chucking power is adjusted and end face of planishing again；
5. between bonding machine heating plate is placed in into two pipe ends, starting progressively to apply pressure P1 within the t1 times makes pipe end be pressed in heating Heated on plate, wherein welding temperature：200~250 DEG C；Pressure is gradually reduced to P2 after uniform bead is formed and is maintained at P2 Absorbed heat, the heat absorption time is t2；
6. within the t3 times, pipe end is unclamped, takes out heating plate, then close up pipe end；
7. and then within the t4 times P1 is progressively forced into since 0 so that uniformly turn over to being respectively formed from inside to outside pipe welding position Side；
8. keeping pressure P1 within the t5 times, welding position is set to naturally cool to less than 60 DEG C；
Wherein, P1：Pressure as defined in welding, P1=（0.15±0.01）A/B, A represent the sectional area of pvc pipe shape thing, and B represents weldering The total effective area of piston in the hydraulic cylinder to pick, unit are square millimeter；
P2：Holding pressure during heat absorption, P2=0.5~0.8P1,
t1：The time formed required for uniform bead, unit are the second, and t1 size is observed to form uniform weldering according to execute-in-place The duration change of pearl；
t2：The heat absorption time required for welding, unit is the second, t2=tube wall thickness * 10, and tube wall thickness unit is millimeter；
t3：Switch the time of defined, unit is the second, 1≤t3≤13；
t4：Adjust pressure to the time of P1 defineds, unit be the second, 1≤t4≤18；
t5：Cool time, unit are minute, 10≤t5≤120.
Further, step 1. in, the preparation method of the pvc pipe shape thing of the extrusion molding is as follows：It is described to be used to prepare The formula of the parts by weight of extrusion molding pvc pipe shape thing is as follows：100 parts of polyvinyl chloride resin, 0.4~4.5 part of stabilizer, oxidic polyethylene 0.4~1.0 part of wax, 0~0.8 part of Tissuemat E, 0~1.0 part of paraffin, 0~0.8 part of stearic acid, 0.1~0.5 part of calcium stearate, 0~3.0 part of acrylate, 0~5.0 part of haloflex, 0~4.0 part of MBS auxiliary agents, 1.0~15.0 parts of calcium carbonate, titanium dioxide 0.2~3.0 part；
The preparation technology of the extrusion molding pvc pipe shape thing comprises the following steps：It is used to prepare extrusion molding pvc pipe according to above-mentioned The formula of the parts by weight of shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, when mixing temperature is to 120 DEG C Be put into cold mixing machine, released when cold mixing is to 60 DEG C it is stand-by, by the material mixed addition twin-screw tube extrusion production line squeeze Go out shaping, tubing is cut into the length of requirement, if flared pipe fitting need to be made, enlarging is carried out with pipe-expanding machine：Flat mouth or R Mouthful；Expressing technique temperature：170~190 DEG C of 1st area of barrel, 160~180 DEG C of 2nd area of barrel, 150~170 DEG C of 3rd area of barrel, the area of barrel 4 140~160 DEG C, 140~160 DEG C of connector, 140~190 DEG C of mould, temperature is incremented by from connector to mouth mold, generally forms two Head height, middle low Temperature Distribution.
Further, step 1. in, the preparation method of the pvc pipe shape thing of the extrusion molding is as follows：It is described to be used to prepare The formula of the parts by weight of injection molding pvc pipe shape thing is as follows：100 parts of polyvinyl chloride resin, 0.4~4.5 part of stabilizer, oxidic polyethylene 0.2~0.5 part of wax, 0~0.5 part of Tissuemat E, 0~0.6 part of paraffin, 0~0.5 part of stearic acid, 0.5~2.0 part of calcium stearate, 0~3.0 part of acrylate, 0~5.0 part of haloflex, 0~4.0 part of MBS auxiliary agents, 1.0~15.0 parts of calcium carbonate, titanium dioxide 0.2~3.0 part；
The preparation technology of the injection molding pvc pipe shape thing comprises the following steps：It is used to prepare injection molding pvc pipe according to above-mentioned The formula of the parts by weight of shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, when mixing temperature is to 120 DEG C Be put into cold mixing machine, released when cold mixing is to 60 DEG C it is stand-by, by the material mixed add double screw extruder be granulated, made Particle input injection machine shaping；It is granulated expressing technique temperature：160~180 DEG C of 1st area of barrel, 150~170 DEG C of 2nd area of barrel, barrel 3 140~160 DEG C of area, 130~150 DEG C of 4th area of barrel, 130~150 DEG C of connector, 130~170 DEG C of mould, temperature from connector to Mouth mold is incremented by, and generally forms two head heights, middle low Temperature Distribution；Injection molding temperature：170~190 DEG C of nozzle, the area of barrel 1 165~185 DEG C, 160~180 DEG C of 2nd area of barrel, 160~175 DEG C of 3rd area of barrel, 160~170 DEG C of 4th area of barrel, injection temperature is from adding Material section to nozzle gradually rises.
Further, the step 5. in welding temperature be 230~250 DEG C.
The present invention has positive effect：（1）The present invention conducts in-depth research to PVC pipeline hot-melt technology, passes through Substantial amounts of experiment and experiment, successfully solve the problems, such as the thermal stability problems during weld heating and form good welding.It is right The pipe joint being welded carries out pressure explosion test, and blow-up point in weld, does not think that the flange that weld is formed is actual The thickness of weld is added, so as to add intensity, its compressive resistance is more than bulk strength.
（2）Present invention heating-up temperature in welding process is high：Normal PVC processing temperatures are not higher than 200 DEG C, but this method Middle temperature of heating plate is 200-250 DEG C.Improve temperature of heating plate purpose be：Make the material rapid melting for being close to heating plate, contract The short heat time, while the time of heat transfer is also shortened, the softening section of uneven fusing is minimized, it is follow-up so as to avoid Docking irregular warpage occurs；Tube is really carried out secondary operation by sweat soldering, and material is in first time tube In molding process, fully plastify（Gelation）, form the network structure that strand is mutually wound.In follow-up hot melt During welding, tube port is set fully to melt, strand solution twines, it is necessary to enough heat energy is obtained, so, in sweat soldering When technological temperature it is higher than first time tube forming temperature, typically at 230 DEG C or so, this be also PVC formula in address it is steady Determine the reason for agent dosage is than normal high 30%.
（3）The present invention whole pressurization in welding process：Minimum 0.5P1 pressure is also kept even in the heat absorption period. The purpose is under pressure：
1st, heating plate can heat heated face more quickly, shorten the heat time, also shorten the time of heat transfer, make uneven The softening section of fusing is minimized, so as to avoid follow-up docking that irregular warpage occurs；
2nd, the material melted earliest overflows under the pressure of heating plate to the inside and outside both sides of pipe, and the melt for preventing thermal history longer is stagnant Stay in welding end surface and influence weld strength.But heat absorption pressure can not be more than 0.8P1, the material otherwise melted all overflows Go out, stay in the actual also no fusing of material of welding end surface and form rosin joint.
（4）The injection molding PVC of the present invention or the PVC of the preparation technology of extrusion molding pvc pipe shape thing formulas stabilization Agent dosage is higher by 30% than normal, and being suitable to the PVC of the present invention by it welds.
（5）The present invention realizes the sweat soldering of heavy caliber PVC pipe, has filled up in the industry in the blank in this field, effectively The use range for improving PVC pipeline.
Brief description of the drawings
Fig. 1 is the pressure versus time welding procedure schematic diagram of the manufacture method of the sweat soldering PVC pipe of the present invention；
Fig. 2 to Fig. 4 is respectively the schematic diagram of straight mouth, R mouths and flat enlarging PVC straight pipes（Section view）；
Fig. 5 to Fig. 7 is respectively the schematic diagram of straight mouth, R mouths and the straight mouth reducing Ts of flat enlarging PVC（Section view）.
Mark in above-mentioned accompanying drawing is as follows：
First single end head leads directly to tube 11, and Double-end leads directly to tube 12, flanging 2, in-flanges 3.
Embodiment
（The formula and its preparation technology of embodiment 1, parts by weight for preparing extrusion molding pvc pipe shape thing）
Sweat soldering PVC is in formula design except the shaping of guarantee pvc pipe shape thing（Extrusion or injection molding）, should also fill Divide and consider follow-up welding fabrication.Material in the presence of heat and mechanical shear stress, has filled through pvc pipe shape thing moulding process Divide plasticizing（Gelation）, form the network structure that strand is mutually wound.In follow-up sweat soldering, to make pvc pipe shape thing Port is fully melted, and strand solution twines, it is necessary to enough heat energy is obtained, so, the technological temperature in sweat soldering is than One time pvc pipe shape thing forming temperature is high, and typically at 230 DEG C or so, this requires that designing heat endurance is preferably formulated, stabilizer The normal tube of amount ratio it is high by more than 30%.PVC-U is the stronger polymer of polarity, with some nonpolar lubricant compatibles Property it is poor, easily migrated when carrying out sweat soldering heating to heating surface, so that weld strength can be influenceed, so should in formula The addition of apolar substance is reduced as far as possible, as long as can meet the processing and forming of tube, it is also possible to segment polarity thing substitutes, Such as Tissuemat E, paraffin are replaced with OPE.The shaping of pvc pipe shape thing is divided into extrusion molding and injection molding, its Flow behavior has the characteristics of different.Extrusion molding is " slide wall flowing ", it is desirable to outer lubrication is laid particular stress on during formula design, and is molded into Type is " viscous wall flowing ", therefore interior lubrication should be laid particular stress on by being formulated design.
A kind of formula of parts by weight for preparing extrusion molding pvc pipe shape thing of the present embodiment is as follows：Polyvinyl chloride resin 100 Part, 0.4~4.5 part of stabilizer, 0.4~1.0 part of OPE, 0~0.8 part of Tissuemat E, 0~1.0 part of paraffin, tristearin 0~0.8 part of acid, 0.1~0.5 part of calcium stearate, acrylate（ACR）0~3.0 part, haloflex（CPE）0~5.0 part, 0~4.0 part of MBS auxiliary agents, 1.0~15.0 parts of calcium carbonate, 0.2~3.0 part of titanium dioxide, appropriate pigment, pigment is such as in the present embodiment Under：0.2~2.0 part of titanium dioxide, 0~0.1 part of phthalocyanine blue, 0~0.1 part of carbon black.Wherein MBS auxiliary agents be methyl methacrylate, Butadiene, styrene copolymer, it is one of most important impact modifiers of PVC.
The preparation technology of the extrusion molding pvc pipe shape thing comprises the following steps：It is used to prepare extrusion molding according to above-mentioned The formula of the parts by weight of pvc pipe shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, mixing temperature is extremely Cold mixing machine is put at 120 DEG C, releases stand-by when cold mixing is to 60 DEG C, the material mixed is added into the life of twin-screw tube extrusion Producing line extrusion molding, tubing is cut into the length of requirement, if flared pipe fitting need to be made, enlarging is carried out with pipe-expanding machine：It is flat Mouth or R mouths.Expressing technique temperature：170~190 DEG C of 1st area of barrel, 160~180 DEG C of 2nd area of barrel, 150~170 DEG C of 3rd area of barrel, material 140~160 DEG C of 4th area of cylinder, 140~160 DEG C of connector, 140~190 DEG C of mould, temperature is incremented by from connector to mouth mold, total bodily form Into two head heights, middle low Temperature Distribution so that cold material quickly heats, and the quick outlet mold of high-temperature fusant, is advantageous to material Fully plastify and thickener will not be decomposed.
（The formula and its preparation technology of embodiment 2, parts by weight for preparing injection molding pvc pipe shape thing）
A kind of formula of parts by weight for preparing injection molding pvc pipe shape thing of the present embodiment is as follows：100 parts of polyvinyl chloride resin, surely Determine 0.4~4.5 part of agent, 0.2~0.5 part of OPE, 0~0.5 part of Tissuemat E, 0~0.6 part of paraffin, stearic acid 0~ 0.5 part, 0.5~2.0 part of calcium stearate, acrylate ACR0~3.0 part, haloflex CPE0~5.0 part, MBS auxiliary agents 0~ 4.0 parts, 1.0~15.0 parts of calcium carbonate, 0.2~3.0 part of titanium dioxide, appropriate pigment, pigment is as follows in the present embodiment：Titanium dioxide 0.2~2.0 part, 0~0.1 part of phthalocyanine blue, 0~0.1 part of carbon black.Wherein MBS auxiliary agents are methyl methacrylate, butadiene, benzene Ethylene-dien terpolymer, it is one of most important impact modifiers of PVC.
The preparation technology of the injection molding pvc pipe shape thing comprises the following steps：It is used to prepare injection molding according to above-mentioned The formula of the parts by weight of pvc pipe shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, mixing temperature is extremely Cold mixing machine is put at 120 DEG C, released when cold mixing is to 60 DEG C it is stand-by, by the material mixed addition double screw extruder make Grain, the particle input injection machine shaping made.It is granulated expressing technique temperature：160~180 DEG C of 1st area of barrel, the area 150 of barrel 2~ 170 DEG C, 140~160 DEG C of 3rd area of barrel, 130~150 DEG C of 4th area of barrel, 130~150 DEG C of connector, 130~170 DEG C of mould, temperature Degree is incremented by from connector to mouth mold, generally forms two head heights, middle low Temperature Distribution so that cold material quickly heats, high The warm quick outlet mold of melt, be advantageous to material and fully plastify and thickener will not be decomposed.Injection molding temperature：Nozzle 170~190 DEG C, 165~185 DEG C of 1st area of barrel, 160~180 DEG C of 2nd area of barrel, 160~175 DEG C of 3rd area of barrel, 160~170 DEG C of 4th area of barrel, note Modeling temperature gradually rises from feeding section to nozzle.
（The manufacture method of embodiment 3, sweat soldering PVC pipe）
See Fig. 1, the manufacture method of the sweat soldering PVC pipe of the present embodiment includes the following steps：
1. the extrusion molding pvc pipe shape thing that is obtained accordingly by embodiment 1 chosen according to product specification or is obtained by embodiment 2 Injection molding pvc pipe shape thing, pvc pipe shape thing is cut into the length and angle of requirement using multi-angle electric tube cutter；
2. the pvc pipe shape thing of well cutting is placed on welding machine clamp and fixed；
3. by the end face processing to be welded of the pipe end of 2 pvc pipe shape things to flat smooth with meet welding requirements be suitable to coincide；
4. end face is closed up, centering situation is checked, two contact surface misalignments to be welded are no more than the 10% of wall thickness, otherwise utilize fixture Chucking power is adjusted and handled again to flat smooth；
5. between bonding machine heating plate is placed in into two pipe ends, starting progressively to apply pressure P1 within the t1 times makes pipe end be pressed in heating Heated on plate, wherein welding temperature（That is temperature of heating plate）：200~250 DEG C, preferably 230~250 DEG C；Forming uniform weldering Pressure is gradually reduced after pearl to P2 and is maintained at P2 and is absorbed heat, the heat absorption time is t2；
6. within the t3 times, pipe end is unclamped, takes out heating plate, then close up pipe end；
7. and then within the t4 times P1 is progressively forced into since 0 so that uniformly turn over to being respectively formed from inside to outside pipe welding position Side；
8. keeping pressure P1 within the t5 times, welding position is set to naturally cool to less than 60 DEG C；
9. take out the welding that product carries out next weld bond.
In the above method, P1：Pressure as defined in welding（Gauge pressure, MPa）, P1=（0.15±0.01）A/B, A represent pvc pipe The sectional area of shape thing（mm2）, B represent bonding machine hydraulic cylinder in piston total effective area（mm2）；
P2：Holding pressure during heat absorption, P2=0.5~0.8P1,
t1：The time formed required for uniform bead（s）, t1 size observed according to execute-in-place to be formed uniform bead when Long change；
t2：The heat absorption time required for welding（s）, t2=tube wall thickness（mm）*10；
t3：Switch the time of defined（s）, 1≤t3≤13；
t4：Pressure is adjusted to the time of P1 defineds（s）, 1≤t4≤18；
t5：Cool time（min）, 10≤t5≤120.
Because PVC material is amorphous substance, the fusing point do not fixed, stabilization can not be formed when with heater plate Melt region.Due to conduction of heat, the temperature of pvc pipe shape thing heating gradually drops along the increase with heated end face distance Low, the softness number of respective material is also gradually to reduce.It is actually formed what one section of melt strength degree gradually increased in endothermic process The softening section of uneven fusing, in subsequent pressurization docking, the softening section of this uneven fusing is extremely unstable, it is possible to Warpage on the inside of tube wall, it is also possible to which warpage on the outside of to tube wall, this irregular warpage can make soldering opening form dislocation and round tube Shape alteration of form, that is, good welding can not be formed, so having to keep P2 pressure, P2 P2=0.5 in the t2 stages As heat absorption pressure, its size is 30 to 50 times of the size of the motoring pressure under same situation by~0.8P1, P2.Must in the t2 stages P2 minimums 0.5P1 pressure need be kept, heating plate can be enable to heat heated face more quickly, shortens the heat time, The time of heat transfer is shortened, is minimized the softening section of uneven fusing, it is irregular so as to avoid follow-up docking from occurring Warpage；And the material melted earliest overflows under the pressure of heating plate to the inside and outside both sides of pipe, prevent thermal history is longer from melting Body is trapped in welding end surface and influences weld strength.But heat absorption pressure can not be more than 0.8P1, the material otherwise melted is complete Portion overflows, and stays in the actual also no fusing of material of welding end surface and forms rosin joint.
（Embodiment 4, PVC straight pipes and its manufacture method）
See Fig. 2 to Fig. 4, the PVC straight pipes of the present embodiment are straight mouth, R mouths or flat enlarging made of two sections of pvc pipe shape thing welding PVC straight pipes, including 2 the first single end heads lead directly to tube 11, flanging 2 and in-flanges 3, and the first single end head leads directly to tubulose Thing 11 is that the one end being prepared by embodiment 1 or 2 is straight mouth, and the other end is the pvc pipe shape thing of straight mouth, R mouths or flat enlarging； 2 the first single end heads lead directly to the level of tube 11 and are oppositely arranged and are welded together, by being located at due to what welding was formed The annular flanging 2 of periphery and annular in-flanges 3 positioned at inner side link together.
The manufacture method of the PVC straight pipes of the present embodiment：
1. the extrusion molding pvc pipe shape thing that is obtained accordingly by embodiment 1 chosen according to product specification or is obtained by embodiment 2 Injection molding pvc pipe shape thing, the length that pvc pipe shape thing is cut into requirement using multi-angle electric tube cutter obtain 2 unified specifications The first single end head lead directly to tube 11；
Weld on machine clamp and fix, 2 the first single end heads 2. the first single end head of well cutting is led directly into tube 11 and is placed in 11 horizontal face of straight-through tube is set；
3. end face processing to be welded to the flat smooth that 2 the first single end heads are led directly to the pipe end of tube 11 will to meet to weld Ask suitable for coincideing：The contact surface to be welded of two pipe ends is planished to uniform to go out to consider to be worth doing with the planing tool on bonding machine；
4. end face is closed up, centering situation is checked, two contact surface misalignments to be welded are no more than the 10% of wall thickness, otherwise utilize fixture Chucking power is adjusted and end face of planishing again；
5. between bonding machine heating plate is placed in into two pipe ends, starting progressively to apply pressure P1 within the t1 times makes pipe end be pressed in heating Heated on plate, wherein welding temperature（That is temperature of heating plate）：200~250 DEG C, preferably 230~250 DEG C；Forming uniform weldering Pressure is gradually reduced after pearl to P2 and is maintained at P2 and is absorbed heat, the heat absorption time is t2；
6. within the t3 times, pipe end is unclamped, takes out heating plate, then close up pipe end；
7. and then within the t4 times P1 is progressively forced into since 0 so that uniformly turn over to being respectively formed from inside to outside pipe welding position Side；
8. keeping pressure P1 within the t5 times, welding position is set to naturally cool to less than 60 DEG C.
In the above method, P1：Pressure as defined in welding（Gauge pressure, MPa）, P1=（0.15±0.01）A/B, A represent pvc pipe Shape thing is the sectional area that the first single end head leads directly to tube 11（mm2）, B represent bonding machine hydraulic cylinder in piston total significant surface Product（mm2）；
P2：Holding pressure during heat absorption, P2=0.5~0.8P1,
t1：The time formed required for uniform bead（s）, t1 size observed according to execute-in-place to be formed uniform bead when Long change；
t2：The heat absorption time required for welding（s）, t2=tube wall thickness（mm）*10；
t3：Switch the time of defined（s）, 1≤t3≤13；
t4：Pressure is adjusted to the time of P1 defineds（s）, 1≤t4≤18；
t5：Cool time（min）, 10≤t5≤120.
In the present embodiment, according to the above method be 315mm to caliber, tube wall thickness 13mm, pipe range are 520mm 2 First single end head leads directly to sectional area A=12327.6mm that tube 11 carries out sweat soldering, then pvc pipe shape thing2, the liquid of bonding machine Total effective area B=2000mm of piston in cylinder pressure2, P1=（0.15±0.01）A/B=0.92Mpa, P2=0.5Mpa, t1=25s, T2=130s, t3=8s, t4=8s, t5=12min, temperature of heating plate=235 DEG C, under the operating environment of the present embodiment, calculate To its P (dragging)=0.01Mpa, P2=0.5Mpa=50P (dragging), P2 size is 50 times of the size of the motoring pressure under same situation, (dragged) much larger than P.
Because PVC material is amorphous substance, the fusing point do not fixed, stabilization can not be formed when with heater plate Melt region.Due to conduction of heat, the temperature of pvc pipe shape thing heating gradually drops along the increase with heated end face distance Low, the softness number of respective material is also gradually to reduce.It is actually formed what one section of melt strength degree gradually increased in endothermic process The softening section of uneven fusing, in subsequent pressurization docking, the softening section of this uneven fusing is extremely unstable, it is possible to Warpage on the inside of tube wall, it is also possible to which warpage on the outside of to tube wall, this irregular warpage can make soldering opening form dislocation and round tube Shape alteration of form, that is, good welding can not be formed, so having to keep P2 pressure, P2 P2=0.5 in the t2 stages As heat absorption pressure, its size is 30 to 50 times of the size of the motoring pressure under same situation by~0.8P1, P2.Must in the t2 stages P2 minimums 0.5P1 pressure need be kept, heating plate can be enable to heat heated face more quickly, shortens the heat time, The time of heat transfer is shortened, is minimized the softening section of uneven fusing, it is irregular so as to avoid follow-up docking from occurring Warpage；And the material melted earliest overflows under the pressure of heating plate to the inside and outside both sides of pipe, prevent thermal history is longer from melting Body is trapped in welding end surface and influences weld strength.But heat absorption pressure can not be more than 0.8P1, the material otherwise melted is complete Portion overflows, and stays in the actual also no fusing of material of welding end surface and forms rosin joint.
（The straight mouth reducing T of embodiment 3, PVC and its manufacture method）
See Fig. 5 to Fig. 7, the straight mouth reducing Ts of PVC of the present embodiment are straight mouth, R made of the vertical welding of two sections of pvc pipe shape things Mouth or the straight mouth reducing Ts of flat enlarging PVC, including 1 the first single end head lead directly to 11,1 Double-ends of tube and lead directly to tubulose Thing 12, flanging 2 and in-flanges, it is that the one end being prepared by embodiment 1 or 2 is that the first single end head, which leads directly to tube 11, Straight mouth, the other end are the pvc pipe shape things of straight mouth, R mouths or flat enlarging；Double-end, which leads directly to tube 12, to be made by embodiment 1 or 2 All it is the pvc pipe shape thing of straight mouth, R mouths or flat enlarging for obtained both ends；First single end head leads directly to tube 11 and Double-end is straight The logical reducing of tube 12；First single end head lead directly to tube 11 and Double-end lead directly to tube 12 axially middle part vertical connection and It is welded together, and the first single end head leads directly to tube 11 and penetrated with the straight-through tube 12 of Double-end, the first single end head is straight Logical tube 11 and Double-end lead directly to tube 12 and passed through because welding formation is positioned at the annular flanging 2 of periphery and position Annular in-flanges in inner side links together.
The manufacture method of the straight mouth reducing Ts of PVC of the present embodiment is：
1. the extrusion molding pvc pipe shape thing that is obtained accordingly by embodiment 1 chosen according to product specification or is obtained by embodiment 2 Injection molding pvc pipe shape thing, length the first single end head of acquisition that pvc pipe shape thing is cut into requirement using multi-angle electric tube cutter are straight Logical tube 11 and Double-end lead directly to tube 12；Sawed again with arc and the external diameter of tube 12 is led directly to the first list according to Double-end The straight mouth end that termination leads directly to tube 11 handles to obtain the contact surface to be welded of arc surfaced；
2. 1. the first single end head that step is obtained leads directly to tube 11 and Double-end leads directly to tube 12 and is placed in welding machine clamp Go up and fix, the axially middle part that the first single end head leads directly to tube 11 and the straight-through tube 12 of Double-end is vertically arranged；
3. end face is closed up, centering situation is checked, checks that the first single end head leads directly to the end to be welded of the arc surfaced of tube 11 Whether the contact surface to be welded at the axially middle part that face leads directly to tube 12 with Double-end is aligned, and is such as otherwise entered using the chucking power of fixture Row adjustment；
4. between bonding machine heating plate is placed in into two contact surfaces to be welded, starting progressively to apply pressure P1 within the t1 times makes pipe end pressure Heat on hot plate, wherein welding temperature（That is temperature of heating plate）：200~250 DEG C, preferably 230~250 DEG C；It is equal being formed Pressure is gradually reduced after even bead to P2 and is maintained at P2 and is absorbed heat, the heat absorption time is t2；
5. within the t3 times, pipe end is unclamped, takes out heating plate, then close up pipe end；
6. and then within the t4 times P1 is progressively forced into since 0 so that uniformly turn over to being respectively formed from inside to outside pipe welding position Side；
7. keeping pressure P1 within the t5 times, welding position is set to naturally cool to less than 60 DEG C；
8. after the straight-through tube 11 of the first single end head to link together and the straight-through tube 12 of Double-end are taken out, pass through perforate Device stretches into from the straight-through tube 11 of the first single end head and leads directly to perforate on the tube wall of tube 12 in Double-end, so as to obtain insertion The straight mouth reducing Ts of PVC.
In the above method, P1：Pressure as defined in welding（Gauge pressure, MPa）, P1=（0.15±0.01）A/B, A represent that first is single Termination leads directly to the sectional area of tube 11（mm2）, B represent bonding machine hydraulic cylinder in piston total effective area（mm2）；
P2：Holding pressure during heat absorption, P2=0.5~0.8P1,
t1：The time formed required for uniform bead（s）, t1 size observed according to execute-in-place to be formed uniform bead when Long change；
t2：The heat absorption time required for welding（s）, t2=tube wall thickness（mm）*10；
t3：Switch the time of defined（s）, 1≤t3≤13；
t4：Pressure is adjusted to the time of P1 defineds（s）, 1≤t4≤18；
t5：Cool time（min）, 10≤t5≤120.
Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and is not to the present invention The restriction of embodiment.For those of ordinary skill in the field, it can also be made on the basis of the above description Its various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair Among the obvious changes or variations that bright spirit is extended out is still in protection scope of the present invention.

Claims (8)

  1. A kind of 1. manufacture method of the straight mouth reducing Ts of PVC, it is characterised in that：The straight mouth reducing Ts of PVC are Two sections of pvc pipe shape things hang down straight mouth, R mouths or the straight mouth reducing Ts of flat enlarging PVC made of welding, including 1 first single-ended Straight-through tube（11）, 1 Double-end lead directly to tube（12）, flanging（2）And in-flanges, the first single end head straight pipe Shape thing（11）It is that one end is straight mouth, the other end is the pvc pipe shape thing of straight mouth, R mouths or flat enlarging；Double-end leads directly to tube（12） It is the pvc pipe shape thing that both ends are all straight mouth, R mouths or flat enlarging；First single end head leads directly to tube（11）With Double-end straight pipe Shape thing（12）Reducing；First single end head leads directly to tube（11）Tube is led directly to Double-end（12）Axially middle part vertical connection And be welded together, and the first single end head leads directly to tube（11）Tube is led directly to Double-end（12）Insertion, first is single Termination leads directly to tube（11）Tube is led directly to Double-end（12）By due to welding formed positioned at the annular outer of periphery Flange（2）And the annular in-flanges positioned at inner side links together；
    The manufacture method of the straight mouth reducing Ts of PVC is：
    1. the pvc pipe shape thing of corresponding extrusion or injection molding is chosen according to product specification, using multi-angle electric tube cutter by pvc pipe The length that shape thing cuts into requirement obtains the straight-through tube of the first single end head（11）Tube is led directly to Double-end（12）；Arc is used again Shape saw leads directly to tube according to Double-end（12）External diameter to the first single end head lead directly to tube（11）Straight mouth end handle to obtain The contact surface to be welded of arc surfaced；
    2. 1. the first single end head that step is obtained leads directly to tube（11）Tube is led directly to Double-end（12）It is placed in bonding machine On fixture and fix, the first single end head leads directly to tube（11）Tube is led directly to Double-end（12）Axially middle part vertically set Put；
    3. end face is closed up, centering situation is checked, checks that the first single end head leads directly to tube（11）Arc surfaced it is to be welded End face leads directly to tube with Double-end（12）Axially middle part contact surface to be welded whether be aligned, such as otherwise utilize fixture clamping Power is adjusted；
    4. between bonding machine heating plate is placed in into two contact surfaces to be welded, starting progressively to apply pressure P1 within the t1 times makes pipe end pressure Heat on hot plate, wherein welding temperature：200~250 DEG C；Pressure is gradually reduced to P2 after uniform bead is formed and is protected Hold and absorbed heat in P2, the heat absorption time is t2；
    5. within the t3 times, pipe end is unclamped, takes out heating plate, then close up pipe end；
    6. and then within the t4 times P1 is progressively forced into since 0 so that uniformly turn over to being respectively formed from inside to outside pipe welding position Side；
    7. keeping pressure P1 within the t5 times, welding position is set to naturally cool to less than 60 DEG C；
    8. the first single end head to link together is led directly into tube（11）Tube is led directly to Double-end（12）After taking-up, pass through Hole making drill leads directly to tube from the first single end head（11）Stretch into and lead directly to tube in Double-end（12）Tube wall on perforate, so as to obtain The straight mouth reducing Ts of PVC that must be penetrated；
    Wherein, P1：Pressure as defined in welding, P1=（0.15±0.01）A/B, A represent that the first single end head leads directly to tube（11）'s Sectional area, B represent bonding machine hydraulic cylinder in piston total effective area, unit is square millimeter；
    P2：Holding pressure during heat absorption, P2=0.5~0.8P1,
    t1：The time formed required for uniform bead, unit are the second, and t1 size is observed to form uniform weldering according to execute-in-place The duration change of pearl；
    t2：The heat absorption time required for welding, unit is the second, t2=tube wall thickness * 10, and tube wall thickness unit is millimeter；
    t3：Switch the time of defined, unit is the second, 1≤t3≤13；
    t4：Adjust pressure to the time of P1 defineds, unit be the second, 1≤t4≤18；
    t5：Cool time, unit are minute, 10≤t5≤120.
  2. 2. the manufacture method of the straight mouth reducing Ts of PVC according to claim 1, it is characterised in that：Step 1. in, institute The preparation method for stating the pvc pipe shape thing of extrusion molding is as follows：The parts by weight for being used to prepare extrusion molding pvc pipe shape thing are matched somebody with somebody Side is as follows：100 parts of polyvinyl chloride resin, 0.4~4.5 part of stabilizer, 0.4~1.0 part of OPE, 0~0.8 part of Tissuemat E, 0~1.0 part of paraffin, 0~0.8 part of stearic acid, 0.1~0.5 part of calcium stearate, 0~3.0 part of acrylate, haloflex 0~ 5.0 parts, 0~4.0 part of MBS auxiliary agents, 1.0~15.0 parts of calcium carbonate, 0.2~3.0 part of titanium dioxide；
    The preparation technology of the extrusion molding pvc pipe shape thing comprises the following steps：It is used to prepare extrusion molding pvc pipe according to above-mentioned The formula of the parts by weight of shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, when mixing temperature is to 120 DEG C Be put into cold mixing machine, released when cold mixing is to 60 DEG C it is stand-by, by the material mixed addition twin-screw tube extrusion production line squeeze Go out shaping, tubing is cut into the length of requirement, if flared pipe fitting need to be made, enlarging is carried out with pipe-expanding machine：Flat mouth or R Mouthful；Expressing technique temperature：170~190 DEG C of 1st area of barrel, 160~180 DEG C of 2nd area of barrel, 150~170 DEG C of 3rd area of barrel, the area of barrel 4 140~160 DEG C, 140~160 DEG C of connector, 140~190 DEG C of mould, temperature is incremented by from connector to mouth mold, generally forms two Head height, middle low Temperature Distribution.
  3. 3. the manufacture method of the straight mouth reducing Ts of PVC according to claim 1, it is characterised in that：Step 1. in, institute The preparation method for stating the pvc pipe shape thing of extrusion molding is as follows：The parts by weight for being used to prepare injection molding pvc pipe shape thing are matched somebody with somebody Side is as follows：100 parts of polyvinyl chloride resin, 0.4~4.5 part of stabilizer, 0.2~0.5 part of OPE, 0~0.5 part of Tissuemat E, 0~0.6 part of paraffin, 0~0.5 part of stearic acid, 0.5~2.0 part of calcium stearate, 0~3.0 part of acrylate, haloflex 0~ 5.0 parts, 0~4.0 part of MBS auxiliary agents, 1.0~15.0 parts of calcium carbonate, 0.2~3.0 part of titanium dioxide；
    The preparation technology of the injection molding pvc pipe shape thing comprises the following steps：It is used to prepare injection molding pvc pipe according to above-mentioned The formula of the parts by weight of shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, when mixing temperature is to 120 DEG C Be put into cold mixing machine, released when cold mixing is to 60 DEG C it is stand-by, by the material mixed add double screw extruder be granulated, made Particle input injection machine shaping；It is granulated expressing technique temperature：160~180 DEG C of 1st area of barrel, 150~170 DEG C of 2nd area of barrel, barrel 3 140~160 DEG C of area, 130~150 DEG C of 4th area of barrel, 130~150 DEG C of connector, 130~170 DEG C of mould, temperature from connector to Mouth mold is incremented by, and generally forms two head heights, middle low Temperature Distribution；Injection molding temperature：170~190 DEG C of nozzle, the area of barrel 1 165~185 DEG C, 160~180 DEG C of 2nd area of barrel, 160~175 DEG C of 3rd area of barrel, 160~170 DEG C of 4th area of barrel, injection temperature is from adding Material section to nozzle gradually rises.
  4. 4. the manufacture method of the straight mouth reducing Ts of PVC according to claim 1, it is characterised in that：Step 4. in Welding temperature is 230~250 DEG C.
  5. A kind of 5. manufacture method of PVC straight pipes, it is characterised in that：The PVC straight pipes are that two sections of pvc pipe shape thing welding are made Straight mouth, R mouths or flat enlarging PVC straight pipes, including 2 the first single end heads lead directly to tube（11）, flanging（2）And varus Side（3）, the first single end head leads directly to tube（11）It is that one end is straight mouth, the other end is the pvc pipe shape of straight mouth, R mouths or flat enlarging Thing；2 the first single end heads lead directly to tube（11）Level is oppositely arranged and is welded together, and passes through what is formed due to welding Annular flanging positioned at periphery（2）And the annular in-flanges positioned at inner side（3）Link together；
    The manufacture method of the PVC straight pipes：
    1. the pvc pipe shape thing of corresponding extrusion or injection molding is chosen according to product specification, using multi-angle electric tube cutter by pvc pipe The first single end head that shape thing cuts into length 2 unified specifications of acquisition of requirement leads directly to tube（11）；
    2. the first single end head of well cutting is led directly into tube（11）It is placed on welding machine clamp and fixes, 2 first single-ended Straight-through tube（11）Horizontal face is set；
    3. 2 the first single end heads are led directly into tube（11）Pipe end end face processing to be welded to flat smooth to meet to weld It is required that suitable for coincideing：The contact surface to be welded of two pipe ends is planished to uniform to go out to consider to be worth doing with the planing tool on bonding machine；
    4. end face is closed up, centering situation is checked, two contact surface misalignments to be welded are no more than the 10% of wall thickness, otherwise utilize fixture Chucking power is adjusted and end face of planishing again；
    5. between bonding machine heating plate is placed in into two pipe ends, starting progressively to apply pressure P1 within the t1 times makes pipe end be pressed in heating Heated on plate, wherein welding temperature：200~250 DEG C；Pressure is gradually reduced to P2 after uniform bead is formed and is maintained at P2 Absorbed heat, the heat absorption time is t2；
    6. within the t3 times, pipe end is unclamped, takes out heating plate, then close up pipe end；
    7. and then within the t4 times P1 is progressively forced into since 0 so that uniformly turn over to being respectively formed from inside to outside pipe welding position Side；
    8. keeping pressure P1 within the t5 times, welding position is set to naturally cool to less than 60 DEG C；
    Wherein, P1：Pressure as defined in welding, P1=（0.15±0.01）A/B, A represent the sectional area of pvc pipe shape thing, and B represents weldering The total effective area of piston in the hydraulic cylinder to pick, unit are square millimeter；
    P2：Holding pressure during heat absorption, P2=0.5~0.8P1,
    t1：The time formed required for uniform bead, unit are the second, and t1 size is observed to form uniform weldering according to execute-in-place The duration change of pearl；
    t2：The heat absorption time required for welding, unit is the second, t2=tube wall thickness * 10, and tube wall thickness unit is millimeter；
    t3：Switch the time of defined, unit is the second, 1≤t3≤13；
    t4：Adjust pressure to the time of P1 defineds, unit be the second, 1≤t4≤18；
    t5：Cool time, unit are minute, 10≤t5≤120.
  6. 6. the manufacture method of PVC straight pipes according to claim 5, it is characterised in that：Step 1. in, the extrusion molding Pvc pipe shape thing preparation method it is as follows：The formula of the parts by weight for preparing extrusion molding pvc pipe shape thing is as follows：PVC 100 parts of resin, 0.4~4.5 part of stabilizer, 0.4~1.0 part of OPE, 0~0.8 part of Tissuemat E, paraffin 0~1.0 Part, 0~0.8 part of stearic acid, 0.1~0.5 part of calcium stearate, 0~3.0 part of acrylate, 0~5.0 part of haloflex, MBS 0~4.0 part of auxiliary agent, 1.0~15.0 parts of calcium carbonate, 0.2~3.0 part of titanium dioxide；
    The preparation technology of the extrusion molding pvc pipe shape thing comprises the following steps：It is used to prepare extrusion molding pvc pipe according to above-mentioned The formula of the parts by weight of shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, when mixing temperature is to 120 DEG C Be put into cold mixing machine, released when cold mixing is to 60 DEG C it is stand-by, by the material mixed addition twin-screw tube extrusion production line squeeze Go out shaping, tubing is cut into the length of requirement, if flared pipe fitting need to be made, enlarging is carried out with pipe-expanding machine：Flat mouth or R Mouthful；Expressing technique temperature：170~190 DEG C of 1st area of barrel, 160~180 DEG C of 2nd area of barrel, 150~170 DEG C of 3rd area of barrel, the area of barrel 4 140~160 DEG C, 140~160 DEG C of connector, 140~190 DEG C of mould, temperature is incremented by from connector to mouth mold, generally forms two Head height, middle low Temperature Distribution.
  7. 7. the manufacture method of PVC straight pipes according to claim 5, it is characterised in that：Step 1. in, the extrusion molding Pvc pipe shape thing preparation method it is as follows：The formula of the parts by weight for preparing injection molding pvc pipe shape thing is as follows：PVC 100 parts of resin, 0.4~4.5 part of stabilizer, 0.2~0.5 part of OPE, 0~0.5 part of Tissuemat E, paraffin 0~0.6 Part, 0~0.5 part of stearic acid, 0.5~2.0 part of calcium stearate, 0~3.0 part of acrylate, 0~5.0 part of haloflex, MBS 0~4.0 part of auxiliary agent, 1.0~15.0 parts of calcium carbonate, 0.2~3.0 part of titanium dioxide；
    The preparation technology of the injection molding pvc pipe shape thing comprises the following steps：It is used to prepare injection molding pvc pipe according to above-mentioned The formula of the parts by weight of shape thing weighs each raw and auxiliary material, puts into homogenizer and carries out hot mixing, when mixing temperature is to 120 DEG C Be put into cold mixing machine, released when cold mixing is to 60 DEG C it is stand-by, by the material mixed add double screw extruder be granulated, made Particle input injection machine shaping；It is granulated expressing technique temperature：160~180 DEG C of 1st area of barrel, 150~170 DEG C of 2nd area of barrel, barrel 3 140~160 DEG C of area, 130~150 DEG C of 4th area of barrel, 130~150 DEG C of connector, 130~170 DEG C of mould, temperature from connector to Mouth mold is incremented by, and generally forms two head heights, middle low Temperature Distribution；Injection molding temperature：170~190 DEG C of nozzle, the area of barrel 1 165~185 DEG C, 160~180 DEG C of 2nd area of barrel, 160~175 DEG C of 3rd area of barrel, 160~170 DEG C of 4th area of barrel, injection temperature is from adding Material section to nozzle gradually rises.
  8. 8. the manufacture method of PVC straight pipes according to claim 5, it is characterised in that：Step 5. in welding temperature be 230~250 DEG C.
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CN113211837A (en) * 2021-06-15 2021-08-06 李志新 High-strength PVC pipe fitting and manufacturing process thereof

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CN101678608A (en) * 2007-04-13 2010-03-24 地下解决方案技术集团股份有限公司 The fusion process therefor of conduit and manufacturing thereof and conduit
CN102134360A (en) * 2011-05-10 2011-07-27 上海远洲管业有限公司 Preparation method of super-strong high temperature-resistant chlorinated polyvinyl chloride tubes
CN105037995A (en) * 2015-07-06 2015-11-11 江苏圣通环境工程有限公司 Building water supply PVC-U pipe fitting, and production method thereof

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US20060071365A1 (en) * 2003-06-13 2006-04-06 Underground Solutions Technologies Group, Inc. Fusion process for conduit
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