CN103737887B - A kind of processing method of multi-layer thermoplasticity plastic pipe - Google Patents
A kind of processing method of multi-layer thermoplasticity plastic pipe Download PDFInfo
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- CN103737887B CN103737887B CN201310737374.7A CN201310737374A CN103737887B CN 103737887 B CN103737887 B CN 103737887B CN 201310737374 A CN201310737374 A CN 201310737374A CN 103737887 B CN103737887 B CN 103737887B
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- 239000004033 plastic Substances 0.000 title claims abstract description 88
- 229920003023 plastic Polymers 0.000 title claims abstract description 88
- 238000003672 processing method Methods 0.000 title claims abstract description 31
- 238000001125 extrusion Methods 0.000 claims abstract description 22
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000004513 sizing Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 31
- 239000000654 additive Substances 0.000 claims description 19
- 230000000996 additive effect Effects 0.000 claims description 19
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 17
- 239000004416 thermosoftening plastic Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 10
- 238000003723 Smelting Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 119
- 239000004831 Hot glue Substances 0.000 description 6
- 230000000844 anti-bacterial effect Effects 0.000 description 5
- 230000003115 biocidal effect Effects 0.000 description 4
- 230000005587 bubbling Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000002708 enhancing effect Effects 0.000 description 4
- 230000002706 hydrostatic effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002365 multiple layer Substances 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 239000011229 interlayer Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- 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
- B29C48/267—Intermediate treatments, e.g. relaxation, annealing or decompression step for the melt
-
- 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
- B29C48/30—Extrusion nozzles or dies
-
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
-
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
-
- 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
- B29L2009/00—Layered products
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of processing method of multi-layer thermoplasticity plastic pipe, adopt at least two layers of thermoplastic plastic layer co-extrusion phase process of smelting, use main extruding machine and at least one auxiliary extruding machine extrusion plastic respectively, in multi-layer co-extruded mould, co-extrusion becomes pipe, after vacuum sizing, diameter rounding and axial stress abatement is carried out by plastic tube rounding stress-removal device, then by cooling aftershaping further.The present invention has the features such as manufacture difficulty is low, good stability, structure simple, low cost of manufacture, improving product performance rate.
Description
Technical field
The present invention relates to a kind of processing method of multi-layer thermoplasticity plastic pipe, belong to thermoplastic pipeline processing technique field.
Background technology
The processing method that traditional multi-layer thermoplasticity plastic pipe adopts different materials to use PUR in layer bonding, it is a kind of multiple tube, such multiple tube relies on different materials to realize different functions, and between different material layer, adopt PUR bonding, by layer materials performance impact, in use there is the risk of coming unstuck and peeling off in its adhesive linkage performance.
Adopt the processing method that PUR is bonding, because hot melt adhesive layer requires very thin, more complicated to the control of hot melt adhesive layer, and the performance of hot melt adhesive layer directly affects multiple tube overall performance.
Adopt in layer bonding processing method, every layer of plastic material difference, need adopt different extruding machines, realizes bonding layer by layer in one or more mould, and mould is complicated, and extruding machine working (machining) efficiency is low, and technology controlling and process is complicated.
Adopt in layer bonding processing method, due to the difference of different layers material and the difference of temperature, the multiple tube machined distortion is large, and diameter out-of-roundness is large, when being unfavorable for Pipe installing and the connection of corresponding pipe fitting.
The thermoplastic pipeline of a lot of application needs to increase several functions simultaneously now, as enhancing, shading, antibacterial, unique color etc., need a point multilayer, add Masterbatch and/or function additive respectively, and main material is identical or close, mutually can be fused into one, if main material is polyacrylic three layers of enhanced polypropylene pipe, double-layer bi-color PA tube etc., realize functions such as strengthening, toughness reinforcing, antibacterial, color is unique respectively.This tubing to need a kind of PUR that do not use, processing method more simple and easy to control, by adding Masterbatch and/or function additive, the function that effective realization enhancings, shading, antibacterial, unique color etc. need, can keep again tubing key property and the small diameter out-of-roundness required by installation.
Summary of the invention
The technical problem to be solved in the present invention is: provide that a kind of manufacture difficulty is low, good stability, structure are simple, the processing method of the multi-layer thermoplasticity plastic pipe of low cost of manufacture, improving product performance rate, solve the processing method that traditional employing is in layer bonding, the performance of hot melt adhesive layer directly affects multiple tube overall performance, and in use there is the risk of coming unstuck and peeling off in the multiple tube produced, its diameter out-of-roundness is large, its mould is complicated, extruding machine working (machining) efficiency is low, the problem of technology controlling and process complexity.
In order to solve the problems of the technologies described above, technical scheme of the present invention there is provided a kind of processing method of multi-layer thermoplasticity plastic pipe, it is characterized in that, comprises the following steps:
Step 1: after feedstock transportation and additive are carried out proportioning, by main extruding machine and at least one auxiliary extruding machine, by the similar materials of the same material or mutually welding that have been uniformly distributed various Masterbatch and/or function additive, heating plasticizing becomes each layer molten state thermoplastic group;
Step 2: the molten state thermoplastic group shunting entered is formed the uniform pipe of multilayer wall thickness by multi-layer co-extruded mould, extrude in follow-up extrusion chamber and be melt into one mutually, the even laminating achieving multilayered molten state thermoplastic group melts mutually with co-extrusion, and multi-layer co-extruded mould adopts the direct current cavity of the main extruding machine of connection and is connected the balance runner of auxiliary extruding machine and follow-up flow dividing structure;
Step 3: carrying out vacuum sizing and preliminary cooling processing to melting all-in-one-piece pipe mutually, forming multi-layer thermoplasticity plastic pipe, carries out diameter rounding and axial stress abatement by plastic tube rounding stress-removal device to multi-layer thermoplasticity plastic pipe;
Step 4: the multi-layer thermoplasticity plastic pipe after carrying out diameter rounding and axial stress abatement identified its tube surfaces coding, further cooler bin cooling, hauling machine at the uniform velocity draws, fixed ruler cutting.
Preferably, in described step 1, various Masterbatch and/or function additive evenly add each extruding machine respectively to, and fully plastify dispersion.
Preferably, in described step 2, multi-layer co-extruded mould connects the uniform balance runner that the balance runner of auxiliary extruding machine is more than 3, and it can pool one deck pipe of uniform wall thickness.
Preferably, the direct current cavity that in described step 2, multi-layer co-extruded mould connects main extruding machine can also be split into the uniform pipe layer of two-layer wall thickness.
Preferably, in described step 3, plastic tube rounding stress-removal device adopts symmetrical one or more pairs of roller structures to carry out radial compression distortion to multi-layer thermoplasticity plastic pipe, achieve the diameter rounding of multi-layer thermoplasticity plastic pipe, cut down and concentrated because extruding and draw the multi-layer thermoplasticity plastic pipe axial linear stress caused.
Preferably, the temperature that in described step 3, multi-layer thermoplasticity plastic pipe is entering plastic tube rounding stress-removal device remains on 40 DEG C ~ 60 DEG C.
The present invention adopts at least two layers of thermoplastic plastic layer co-extrusion phase process of smelting, use main extruding machine and at least one auxiliary extruding machine extrusion plastic respectively, the extrusion capacity of every platform extruding machine reduces, plasticize is more complete, the Masterbatch added and/or function additive are more evenly distributed, the impact of process on material is less, while realizing color and additional function, remains the superior function of material better.In multi-layer co-extruded mould, co-extrusion becomes pipe, after vacuum sizing, carries out diameter rounding and axial stress abatement by plastic tube rounding stress-removal device, then by cooling aftershaping further.
The present invention can by the similar materials of same material or mutually welding, multi-layer co-extrudedly in a mold to melt mutually, and make each layer by adding Masterbatch and/or function additive, the function that effective realization enhancings, shading, antibacterial, unique color etc. need, can keep again tubing key property and the small diameter out-of-roundness required by installation.Do not re-use the processing method that hot melt adhesive layer layer is bonding, technical process is more simple and easy to control.
The processing method of this multi-layer thermoplasticity plastic pipe can produce at least two-layer multi-layer thermoplasticity plastic pipe.The layers of material of this plastic tube is identical or close, achieves adjacent layer co-extrusion and is melt into one mutually, do not have interlayer physical bonding, do not have the risk of timeliness and fatigue damage.Each layer of this plastic tube with the addition of Masterbatch and/or function additive respectively by main extruding machine and at least one auxiliary extruding machine, achieves changing layer and color; Each layer possesses specific function again, and as the strong antibiotic property that antibiotic rate is greater than 99.90%, the fiberglass reinforced of three-point bending amount of deflection reduction by more than 40%, height of the fall increase the freeze proof toughness etc. of more than 1.5 times.This plastic tube adopts multi-layer co-extruded mould to carry out multi-layer co-extrudedly melting mutually, and its degree of crystallinity increases, and achieving 20 DEG C of hydrostatic tensions increases by 5% ~ 20%, 95 DEG C of hydrostatic tensions and increase by 10% ~ 30%.This plastic tube adopts plastic tube rounding stress-removal device to carry out radial compression distortion, cut down and concentrated because extruding and draw the axial linear stress caused, its limiting damage shape is the bubbling cut of subglobular, is significantly different from axial annular bubbling cut or the rupture along axial direction of common tube.
The present invention is for processing a kind of multi-layer thermoplasticity plastic pipe, and its intensity, rigidity and toughness are enhanced, and can also realize the specific function of each layer as required.This multilayer plastic pipe adopts the similar materials of same material or welding mutually, and when multi-layer co-extruded, each layer surfaces externally and internally some crystallinity is high, after being mutually fused into one, improve overall degree of crystallinity, enhances mechanical property; Meanwhile, after tubing Vacuum shaping, carry out radial rounding distortion again, the directionality stress that the axial crystallization trend eliminating the multi-layer co-extruded technique of tubing is formed gathers; Every layer can also be added different Masterbatch and/or function additive, realizes tubing multiple-layer polychromatic and/or multi-functional.
The processing method of this multi-layer thermoplasticity plastic pipe is the transformation carried out on traditional production equipment, and the auxiliary extruding machine of interpolation can be the superseded old extruding machine of low production efficiency; Multi-layer co-extruded mould improves to manufacture on the basis of common die, and manufacture difficulty is low, good stability; Plastic tube rounding stress-removal device is directly installed on production line, and structure is simple, low cost of manufacture.The method is applicable to transformation conventional production lines, improving product performance rate.
Accompanying drawing explanation
Fig. 1 is the structural representation of multi-layer thermoplasticity plastic pipe;
Fig. 2 is the machining sketch chart of multi-layer thermoplasticity plastic pipe.
Wherein: 1 is multi-layer thermoplasticity plastic pipe, 2 is plastic tube rounding stress-removal device, and 3 is multi-layer co-extruded mould, and 4 is auxiliary extruding machine, and 5 is main extruding machine.
Detailed description of the invention
For making the present invention become apparent, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Embodiment 1
The present invention is a kind of processing method of multi-layer thermoplasticity plastic pipe, and this processing method can produce multi-layer thermoplasticity plastic pipe 1 as shown in Figure 1.As shown in Figure 2, the whole process of this processing method comprises the following steps:
1) feedstock transportation is entered the hopper of traditional main extruding machine 5 and at least one auxiliary extruding machine 4, respectively Masterbatch and/or function additive usage ratio batch mixing feed mechanism are added to extruder hopper outlet plenum, with raw material from phase Homogeneous phase mixing.
2) by traditional main extruding machine 5 and at least one auxiliary extruding machine 4, the molten state thermoplastic group of the similar materials of same material or the welding being mutually uniformly distributed various Masterbatch and/or function additive is extruded respectively.Require that various Masterbatch and/or function additive evenly add each extruding machine respectively to, and fully plastify dispersion.Not having particular requirement to main extruding machine 5 and at least one auxiliary extruding machine 4, can also be the old extruding machine of low production efficiency that this enterprise eliminates.
3) by the main extruding machine of connection 5 of multi-layer co-extruded mould 3 direct current cavity be connected the balance runner of auxiliary extruding machine 4 and follow-up flow dividing structure, the molten state plastics group shunting entered is formed the uniform pipe of multilayer wall thickness, extrudes in follow-up extrusion chamber and be melt into one mutually.Require that the balance runner of the auxiliary extruding machine of connection 4 of this multi-layer co-extruded mould 3 is designed to the uniform balance runner of more than 3, one deck pipe of uniform wall thickness can be pooled, and unbalanced impact is not caused on other layer of pipe; Its direct current cavity connecting main extruding machine 5 can also be split into the uniform pipe layer of two-layer wall thickness; The pipe layer of multilayered molten state can extrude and be melt into one mutually in the extrusion chamber that it is follow-up; The even laminating realizing multilayered molten state thermoplastic group melts mutually with co-extrusion.This multi-layer co-extruded mould 3 replaces traditional individual layer pipe extrusion die.Every platform extruding machine by by the different multi-layer co-extruded mould 3 needing design, can form this plastic pipe layer of one or more layers diverse location same material, and the plastic pipe layer formed with other extruding machines is the molten pipe forming this multi-layer thermoplasticity plastic pipe 1 mutually.Every layer of plastic pipe layer can realize the wall thickness ratio of 10% ~ 90% by the extruded velocity of main adjustment each extruding machine.
4) carrying out vacuum sizing and preliminary cooling processing to melting all-in-one-piece pipe mutually, forming multi-layer thermoplasticity plastic pipe 1.
5) by plastic tube rounding stress-removal device 2, diameter rounding and axial stress abatement are carried out to the multi-layer thermoplasticity plastic pipe 1 through vacuum sizing and preliminary cooling.Require that the temperature entering the multi-layer thermoplasticity plastic pipe 1 of plastic tube rounding stress-removal device 2 also remains on 40 DEG C ~ 60 DEG C.Require that this plastic tube rounding stress-removal device 2 at least adopts a pair roller structure, can rotate and feeding around multi-layer thermoplasticity plastic pipe 1, smooth surface is corrosion-resistant, radial compression distortion can be carried out to multi-layer thermoplasticity plastic pipe 1, while its diameter of rounding, cut down and concentrate because extruding and draw the axial linear stress caused.This plastic tube rounding stress-removal device 2 can be directly installed on the vacuum tank port of export.
6) coding mark is carried out on multi-layer thermoplasticity plastic pipe 1 surface after carrying out diameter rounding and axial stress abatement.
7) by the cooler bin of more than 2 groups, further cooling is implemented to multi-layer thermoplasticity plastic pipe 1.
8) multi-layer thermoplasticity plastic pipe 1 is at the uniform velocity drawn by hauling machine.
9) by Chipless cutting machine, multi-layer thermoplasticity plastic pipe 1 fixed ruler cutting is become product pipe.
The present invention is a kind of processing method of multi-layer thermoplasticity plastic pipe, and for processing a kind of multi-layer thermoplasticity plastic pipe, its intensity, rigidity and toughness are enhanced, and can also realize the specific function of each layer as required.This multilayer plastic pipe adopts the similar materials of same material or welding mutually, and when multi-layer co-extruded, each layer surfaces externally and internally some crystallinity is high, after being mutually fused into one, improves overall degree of crystallinity; Meanwhile, after tubing Vacuum shaping, carry out radial rounding distortion again, the directionality stress that the axial crystallization trend eliminating the multi-layer co-extruded technique of tubing is formed gathers; Every layer can also be added different Masterbatch and/or function additive, realizes tubing multiple-layer polychromatic and/or multi-functional.
The present invention can by the similar materials of same material or mutually welding, multi-layer co-extrudedly in a mold to melt mutually, and make each layer by adding Masterbatch and/or function additive, the function that effective realization enhancings, shading, antibacterial, unique color etc. need, can keep again tubing key property and the small diameter out-of-roundness required by installation.Do not re-use the processing method that hot melt adhesive layer layer is bonding, technical process is more simple and easy to control.
Method of the present invention is on conventional plastic tube extrusion Process ba-sis, main extruding machine 5 and at least one auxiliary extruding machine 4 is used to extrude the molten plastic group being uniformly distributed various Masterbatch and/or function additive respectively, multi-layer co-extruded mould 3 is adopted to carry out multi-layer co-extrudedly melting mutually, plastic tube rounding stress-removal device 2 is adopted to carry out diameter rounding and stress reduction process, the intensity of multi-layer thermoplasticity plastic pipe 1, rigidity and toughness can be realized be enhanced, realize the specific function of each layer simultaneously.
The close thermoplastic of the welding of the same race or mutual of multilayer, when molten state, controls suitable melt temperature and melt pressure, can co-extrusion melt mutually well; And accept more heat and frictional force than inner due to the material of the surfaces externally and internally of every layer of pipe, molecular structure is more regular, and its degree of crystallinity is higher, thus multi-layer co-extruded molten mutually after overall degree of crystallinity be improved, enhance mechanical property.
Main extruding machine 5 and at least one auxiliary extruding machine 4 is used to carry out extrusion moulding, the extrusion capacity of every platform extruding machine reduces, plasticize is more complete, the Masterbatch added and/or function additive are more evenly distributed, the impact of process on material is less, while realizing color and additional function, remain the superior function of material better.
Multi-layer co-extruded mould 3, than common individual layer extrusion die, has structurally carried out radial direction by a larger margin to every layer material and has shunted and crimp, cut down the stress influence of its axial deformation; Plastic tube rounding stress-removal device 2 adopts one or more pairs of roller structure, use for reference the rounding principle of thin metallic tubd, in elastic deformation temperature province, radial deformation is carried out to multi-layer thermoplasticity plastic pipe 1, while its diameter of rounding, the stress influence of its axial deformation of abatement further.Compare traditional diamond-making technique, multi-layer co-extruded mould 3 and plastic tube rounding stress-removal device 2 have significantly been cut down its axial stress and have been concentrated.
Processing method of the present invention requires the main extruding machine 5 of configuration one and at least one auxiliary extruding machine 4, manufactures and designs various multi-layer co-extruded mould 3 and replaces traditional individual layer pipe extrusion die, manufacture and design plastic tube rounding stress-removal device 2 and be arranged on the vacuum tank port of export.This processing method can produce at least two-layer multi-layer thermoplasticity plastic pipe 1, can every layer of point color and add specific function auxiliary agent, as the strong antibiotic property that antibiotic rate is greater than 99.90%, the fiberglass reinforced of three-point bending amount of deflection reduction by more than 40%, height of the fall increase the frost resistance etc. of more than 1.5 times.Use the multi-layer thermoplasticity plastic pipe 1 that this processing method is produced, the same material individual layer tubing that relative traditional diamond-making technique is produced, can realize 20 DEG C of hydrostatic tensions increases by 5% ~ 20%, 95 DEG C of hydrostatic tensions increases by 10% ~ 30%.This processing method have employed plastic tube rounding stress-removal device 2, can cut down and concentrate because extruding and draw the axial linear stress caused, its limiting damage shape is the bubbling cut of subglobular, is significantly different from axial annular bubbling cut or the rupture along axial direction of common tube.This processing method is applicable to the transformation of enterprise's traditional diamond-making technique, promotes each side technical performance and the specific function of conventional monolayers tubing.
Claims (6)
1. a processing method for multi-layer thermoplasticity plastic pipe, is characterized in that, comprises the following steps:
Step 1: after feedstock transportation and additive are carried out proportioning, by main extruding machine (5) and at least one auxiliary extruding machine (4), by the similar materials of the same material or mutually welding that have been uniformly distributed various Masterbatch and/or function additive, heating plasticizing becomes each layer molten state thermoplastic group;
Step 2: the molten state thermoplastic group shunting entered is formed the uniform pipe of multilayer wall thickness by multi-layer co-extruded mould (3), extrude in follow-up extrusion chamber and be melt into one mutually, the even laminating achieving multilayered molten state thermoplastic group melts mutually with co-extrusion, and multi-layer co-extruded mould (3) adopts the direct current cavity of the main extruding machine of connection (5) and is connected the balance runner of auxiliary extruding machine (4) and follow-up flow dividing structure;
Step 3: carry out vacuum sizing and preliminary cooling processing to melting all-in-one-piece pipe mutually, form multi-layer thermoplasticity plastic pipe (1), by plastic tube rounding stress-removal device (2), diameter rounding and axial stress abatement are carried out to multi-layer thermoplasticity plastic pipe (1);
Step 4: to the tube surfaces coding mark of the multi-layer thermoplasticity plastic pipe (1) of carrying out after diameter rounding and axial stress abatement, further cooler bin cooling, hauling machine at the uniform velocity draws, and fixed ruler cutting completes the processing of multi-layer thermoplasticity plastic pipe.
2. the processing method of a kind of multi-layer thermoplasticity plastic pipe as claimed in claim 1, is characterized in that, in described step 1, various Masterbatch and/or function additive evenly add each extruding machine respectively to, and fully plastify dispersion.
3. the processing method of a kind of multi-layer thermoplasticity plastic pipe as claimed in claim 1, it is characterized in that, in described step 2, multi-layer co-extruded mould (3) connects the uniform balance runner that the balance runner of auxiliary extruding machine (4) is more than 3, and it can pool one deck pipe of uniform wall thickness.
4. the processing method of a kind of multi-layer thermoplasticity plastic pipe as claimed in claim 1, it is characterized in that, the direct current cavity that in described step 2, multi-layer co-extruded mould (3) connects main extruding machine (5) can also be split into the uniform pipe layer of two-layer wall thickness.
5. the processing method of a kind of multi-layer thermoplasticity plastic pipe as claimed in claim 1, it is characterized in that, in described step 3, plastic tube rounding stress-removal device (2) adopts symmetrical one or more pairs of roller structures to carry out radial compression distortion to multi-layer thermoplasticity plastic pipe (1), achieve the diameter rounding of multi-layer thermoplasticity plastic pipe (1), cut down and concentrated because extruding and draw multi-layer thermoplasticity plastic pipe (1) the axial linear stress caused.
6. the processing method of a kind of multi-layer thermoplasticity plastic pipe as claimed in claim 1, it is characterized in that, the temperature that in described step 3, multi-layer thermoplasticity plastic pipe (1) enters plastic tube rounding stress-removal device (2) remains on 40 DEG C ~ 60 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310737374.7A CN103737887B (en) | 2013-12-27 | 2013-12-27 | A kind of processing method of multi-layer thermoplasticity plastic pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310737374.7A CN103737887B (en) | 2013-12-27 | 2013-12-27 | A kind of processing method of multi-layer thermoplasticity plastic pipe |
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| Publication Number | Publication Date |
|---|---|
| CN103737887A CN103737887A (en) | 2014-04-23 |
| CN103737887B true CN103737887B (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310737374.7A Active CN103737887B (en) | 2013-12-27 | 2013-12-27 | A kind of processing method of multi-layer thermoplasticity plastic pipe |
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| CN105291403A (en) * | 2015-11-10 | 2016-02-03 | 上海天力实业（集团）有限公司 | Method and device for reducing axial stress concentration of thermoplastic plastic pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101118025A (en) * | 2007-07-26 | 2008-02-06 | 李子清 | PVC-U composite nano drainpipe manufacturing method |
| CN201863382U (en) * | 2010-10-20 | 2011-06-15 | 江苏常盛管业有限公司 | Plastic pipe three-layer co-extruder head |
| CN103182776A (en) * | 2012-07-10 | 2013-07-03 | 河南联塑实业有限公司 | Pipe rounding device |
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| JPH01188317A (en) * | 1988-01-25 | 1989-07-27 | Nippon Steel Corp | How to color plastic coated metal tubes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101118025A (en) * | 2007-07-26 | 2008-02-06 | 李子清 | PVC-U composite nano drainpipe manufacturing method |
| CN201863382U (en) * | 2010-10-20 | 2011-06-15 | 江苏常盛管业有限公司 | Plastic pipe three-layer co-extruder head |
| CN103182776A (en) * | 2012-07-10 | 2013-07-03 | 河南联塑实业有限公司 | Pipe rounding device |
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