CN101856867A - Extrusion molding control method of beta-PP pipe - Google Patents
Extrusion molding control method of beta-PP pipe Download PDFInfo
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- CN101856867A CN101856867A CN201010115878A CN201010115878A CN101856867A CN 101856867 A CN101856867 A CN 101856867A CN 201010115878 A CN201010115878 A CN 201010115878A CN 201010115878 A CN201010115878 A CN 201010115878A CN 101856867 A CN101856867 A CN 101856867A
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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
- B29C48/03—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
-
- 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
-
- 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
- B29C2948/92923—Calibration, after-treatment or cooling zone
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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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
- B29C48/912—Cooling of hollow articles of tubular films
- B29C48/913—Cooling of hollow articles of tubular films externally
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/918—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides an extrusion molding control method of a beta-PP pipe, which comprises the following steps: 1) arranging a cooling water ring in front of a cooling water sleeve, and primarily cooling the pipe extruded from a die before entering the cooling water sleeve by the cooling water ring; and 2) arranging a thermostat in a cooling water tank to control the water temperature of the cooling water tank within the range of 28-40 DEG C via the thermostat when the pipe enters the cooling water sleeve so as to re-cool the pipe.
Description
Technical field
The invention belongs to the control field of extruding of PP tubing, particularly relate to the extrusion molding control method of a kind of β-PP tubing.
Background technology
In five big general-purpose plastics, polypropylene density minimum, combination property is higher and balanced, mainly shows: the little (0.9-0.91g/cm of relative density
3); Lustrous surface is good; Better heat-resisting is arranged; Mechanical performance such as yield strength, hot strength, surface strength, rigidity and wearability etc. are all more excellent; Especially outstanding is its be full of cracks of good proof stress and resistance to chemical corrosion, makes it at novel building tubing, and particularly the hot water conveying pipe aspect has obtained great development.
Can there be three kinds for the pp material of buying in the market: HOPP (PP-H), block copolymerization polypropylene (PP-B) and atactic copolymerized polypropene (PP-R).PP-B compares with PP-H, impact property, and particularly cryogenic property is much improved, but hot strength and flexural modulus reduce greatly, and heat distortion temperature has descended about 20 ℃, can not use as hot-water line; PP-R compares with PP-H, and impact property and low temperature brittleness make moderate progress, and hear resistance is constant substantially, is the unique use material of present hot water with polypropylene pipe.Therefore, the acquisition polypropylene raw material that combination property is good, price is suitable are directly connected to the extensive use of polypropylene pipe.
Toughness reinforcing is a big important modification technology of PP high performance, and the toughening technology of present PP mainly is to solve by the copolymerization of PP and ethene or alpha-olefin or adding elastomeric component blending and modifying.Though this means can significantly improve the toughness of PP, also lose advantages such as intrinsic high rigidity of PP and high thermal deformation.Therefore, how to solve above-mentioned contradiction, searching can improve the toughness of PP, can keep the high rigidity of PP and general character, the key technology that high thermal deformation just becomes the PP high performance again.
In this case,, be about to common alpha-crystal form PP and be transformed into beta crystal PP,, become a novelty technology of PP high performance to obtain high rigidity, high tenacity, high-fire resistance by PP is carried out the crystal formation modification.Since the last century the nineties, research to the performance of β-PP and application facet is very active, existing studies show that, compare with α-PP, the impact flexibility of β-PP can improve one to three times, heat distortion temperature can improve ten to 30 degree, and intensity and modulus only slightly reduce, can keep the intrinsic higher-strength of PP, rigidity and hear resistance, can promote the toughness of PP again significantly, though opened up a new way for solving rigidity and this contradiction that is difficult to overcome of hear resistance that toughness that elastic body toughening PP promotes PP significantly reduces PP.
Under common process conditions, PP is exhausted, and major part is to exist to belong to monoclinic alpha-crystal form.The beta crystal that belongs to pseudohexagonal crystalline system belongs to metastable condition on thermodynamics, also difficult generation the on dynamics.The beta crystal of PP was just found and report by people such as Keith as far back as nineteen fifty-nine, but since its will under the specific thermograde or melt stand that crystallization could generate under certain shear action, process conditions are difficult to control, and the beta-crystalline form content that is generated is not high yet, do not have tangible modifying function, therefore in thereafter several years, seldom studied by the people.
Had not yet to see by improving existing production line, optimized the expressing technique parameter and reach the relevant report that more beta-crystalline forms generated, improved beta-crystalline form content, improve β-PP pipe workpiece quality.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of extrusion molding control method of the PP of beta crystal simply and easily tubing was provided.
To achieve these goals, the technical scheme of employing is as follows:
The extrusion molding control method of a kind of β-PP tubing comprises the steps:
1) by the cooling water ring is installed in the cooling jacket front, adopt this cooling water ring that the tubing of extruding from the mouth mould is tentatively cooled off before entering cooling jacket;
2) by thermostat is set in cooling water tank, make the water temperature of controlling cooling water tank by this thermostat when tubing enters cooling jacket in 28-40 ℃ scope, realize cooling once more to tubing.
In the technique scheme, the taper shape of described step 1) cooling water curtain becomes 30-45 ° of angle to spray water to pipe outer surface, forms even, soft conical water curtain and cools off tubing.
The cooling water that the cooling water ring of described step 1) is sprayed, its water temperature is in 70-80 ℃ scope.Because more than tubing temperature 180 degree, gradient cooling at this moment, this moment, water temperature was 70-80 ℃.
Described step 2) the water temperature trend that tapers off of control cooling water tank, cooling water tank is divided into four joints, and first segment water tank water temperature is controlled at 35-40 ℃, and the second water-saving box water temperature is controlled at 32-35 ℃, the 3rd water-saving box water temperature is controlled at 30-32 ℃, and the 4th water-saving box water temperature controls to 28-30 ℃.
Control method of the present invention comprises that also the extrusion temperature of counterpart mould controls, and makes the extrusion temperature of mouthful mould remain between 180-200 ℃.
The extrusion temperature of described counterpart mould is controlled and is also comprised when the roughening of material embryo surface, reduces by 5 ℃-10 ℃ adjustment mechanism.
The present invention has the cooling water ring that temperature control is regulated by installing additional, further also installed temperature regulating device additional at cooling water tank, further at the formation condition characteristics of β crystalline substance among the PP, some parameters of traditional PP tubing expressing technique are optimized improvement, thereby obtain the suitable β of a cover-extruding of PP tubing and control production line and technology, characteristics of the present invention are as follows:
(1) install controllable temperature cooling water ring additional, install the benefit that controllable temperature cooling water ring has several aspects additional, a) lubrication makes pipe enter calibration sleeve smoothly; B) tube-surface styling by cooling, tentatively finalizes the design the extruded stock embryo surface, steady and continuous production; C) by temperature control, avoid surperficial chilling, set up the thermograde that is fit to beta-crystalline form one-tenth.Further, by regulating cooling water ring degree of tightness, inflow size, make the cooling water ring become even, soft conical cascade, become about 30-45 ° of angle cooling tubing, water temperature is controlled at 70-80 ℃.The ring sparger and the distance between the tank panel of cooling water ring are 50-120mm, and the ring sparger of cooling water ring and the distance between mouthful mould are 30-80mm.By regulating the mould port expansion that these distances can effectively be regulated tubing.
(2) install the cooling water tank temperature control equipment additional, by installing the temperature control equipment of electrical equipment control valve as cooling water tank additional, the turnover water valve is controlled by thermometer in the water tank, and when temperature was higher than setting value, the turnover water valve was opened; When temperature was lower than setting value, the turnover water valve cut out and connects inner heating device and carries out the water temperature heating.
(3) extruder board temperature optimization improves 5-10 ℃ on the basis of original PP extrusion temperature, temperature of charge is remained between 180-200 ℃.
The present invention must look mould size and actual extruded stock embryo surface situation and adjust Temperature Distribution in specific operation process, if the roughening of material embryo surface should in time reduce by 5 ℃-10 ℃ of barrel zone temperatures.
Compared with prior art, the present invention has following beneficial effect:
1, controllable temperature cooling water ring is installed in the present invention additional before advancing cooling jacket.The benefit that several aspects are arranged, a) lubrication makes pipe enter calibration sleeve smoothly; B) tube-surface styling by cooling, tentatively finalizes the design the extruded stock embryo surface, steady and continuous production; C) by temperature control, avoid surperficial chilling, set up the thermograde that is fit to beta-crystalline form one-tenth.
2, the present invention handles the water termostat in the cooling water tank, guarantees that water temperature at 28-40 ℃, not only can cool off tubing effectively, guarantees smoothly cooling and shaping and helps forming and be fit to the brilliant particular temperature gradient that transforms of β;
3, the present invention is optimized the various parameters in the expressing technique according to the characteristics of β-PP tubing, can improve the conversion ratio that later stage alpha-crystal form PP is transformed into beta crystal PP.
Description of drawings
Fig. 1 is for implementing device structure schematic diagram of the present invention.
The specific embodiment
The present invention is described further below in conjunction with accompanying drawing.
Implement device structure of the present invention as shown in Figure 1, between extrusion neck ring mold 4 and cooling water tank 6, be provided with cooling water ring 1, the water of the mouth spray ejection of cooling water ring 1 is circular cone water curtain 2, cooling water ring 1 also is connected with thermostat 3, when extruding, the pp raw material 5 of melt shape is extruded from extrusion neck ring mold 4, is cooled off at its outer surface water spray by cooling water ring 1 behind the moulding tubulose, enters the calibration sleeve 7 of cooling water tank 6 after the cooling of supercooled water ring 1.
The present invention is described further with four embodiment below.
β-PP material at 80 ℃ of oven dry 4h, is added in the extruder hopper, and by following technological parameter setting, extruding pipe material, the tubing specification is 25*3.4mm.
Detect the performance such as the following table of tubing:
| | Embodiment | 1 | |
|
|
| Vicat softening point (℃) | ??92 | ??90 | ??91 | ??90 | |
| Tensile yield strength (Mpa) | ??32.5 | ??30.2 | ??31.6 | ??31.5 | |
| Hydraulic pressure (20 ℃, 1h) | Crack-free, ne-leakage | Crack-free, ne-leakage | Crack-free, ne-leakage | Crack-free, ne-leakage | |
| Hydraulic pressure (95 ℃, 165h) | Crack-free, ne-leakage | Crack-free, ne-leakage | Crack-free, ne-leakage | Crack-free, ne-leakage |
Claims (7)
1. the extrusion molding control method of β-PP tubing is characterized in that described control method comprises the steps:
1) by the cooling water ring is installed in the cooling jacket front, adopt this cooling water ring that the tubing of extruding from the mouth mould is tentatively cooled off before entering cooling jacket;
2) by thermostat is set in cooling water tank, make the water temperature of controlling cooling water tank by this thermostat when tubing enters cooling jacket in 28-40 ℃ scope, realize cooling once more to tubing.
2. the extrusion molding control method of β according to claim 1-PP tubing is characterized in that the cooling water curtain of described step 1) becomes 30-45 ° of angle to spray water to pipe outer surface, forms even, soft conical water curtain and cools off tubing.
3. the extrusion molding control method of β according to claim 1-PP tubing is characterized in that the cooling water that the cooling water ring of described step 1) is sprayed, and its water temperature is in 70-80 ℃ scope.
4. the extrusion molding control method of β according to claim 1-PP tubing, it is characterized in that described step 2) by the electrical control valve is set in cooling water tank, control when the water temperature in the cooling water tank is higher than setting value by the electrical control valve, open the turnover water valve, and water temperature is lower than when setting value, then closes the turnover water valve and connects heater and carry out the water temperature heating.
5. according to the extrusion molding control method of claim 1 or 4 described β-PP tubing, it is characterized in that described step 2) the water temperature trend that tapers off of control cooling water tank, cooling water tank is divided into four joints, first segment water tank water temperature is controlled at 35-40 ℃, the second water-saving box water temperature is controlled at 32-35 ℃, the 3rd water-saving box water temperature is controlled at 30-32 ℃, and the 4th water-saving box water temperature controls to 28-30 ℃.
6. the extrusion molding control method of β according to claim 1-PP tubing is characterized in that described control method comprises that also the extrusion temperature of counterpart mould controls, and makes the extrusion temperature of mouthful mould remain between 180-200 ℃.
7. the extrusion molding control method of β according to claim 6-PP tubing, the extrusion temperature that it is characterized in that described counterpart mould are controlled and are also comprised when the roughening of material embryo surface, reduce by 5 ℃-10 ℃ adjustment mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101158781A CN101856867B (en) | 2010-02-11 | 2010-02-11 | Extrusion molding control method of beta-PP pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101158781A CN101856867B (en) | 2010-02-11 | 2010-02-11 | Extrusion molding control method of beta-PP pipe |
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| Publication Number | Publication Date |
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| CN101856867A true CN101856867A (en) | 2010-10-13 |
| CN101856867B CN101856867B (en) | 2013-03-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103171068A (en) * | 2011-12-26 | 2013-06-26 | 福建亚通新材料科技股份有限公司 | Method for toughening improvement of polypropylene pipes |
| CN103624948A (en) * | 2012-08-20 | 2014-03-12 | 乐普（北京）医疗器械股份有限公司 | Extrusion molding method for medical catheter tube |
| CN105150487A (en) * | 2015-08-14 | 2015-12-16 | 浙江伟星新型建材股份有限公司 | Fractional crystallization method for Beta-form-crystal PPR pipe extrusion |
| CN105333235A (en) * | 2015-08-28 | 2016-02-17 | 湖北荆塑科技发展有限公司 | Antibacterial kitchen and bathroom pipe and production technology |
| CN107877874A (en) * | 2017-12-14 | 2018-04-06 | 上海邦临机械设备有限公司 | A kind of heat radiating type ceramic honeycomb panel heat welded device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1861367A (en) * | 2006-06-06 | 2006-11-15 | 俞昌文 | Equipment and process for producing PPR pipe material by using novel core and vacuum chilling cabin |
-
2010
- 2010-02-11 CN CN2010101158781A patent/CN101856867B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1861367A (en) * | 2006-06-06 | 2006-11-15 | 俞昌文 | Equipment and process for producing PPR pipe material by using novel core and vacuum chilling cabin |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103171068A (en) * | 2011-12-26 | 2013-06-26 | 福建亚通新材料科技股份有限公司 | Method for toughening improvement of polypropylene pipes |
| CN103624948A (en) * | 2012-08-20 | 2014-03-12 | 乐普（北京）医疗器械股份有限公司 | Extrusion molding method for medical catheter tube |
| CN105150487A (en) * | 2015-08-14 | 2015-12-16 | 浙江伟星新型建材股份有限公司 | Fractional crystallization method for Beta-form-crystal PPR pipe extrusion |
| CN105150487B (en) * | 2015-08-14 | 2017-11-17 | 浙江伟星新型建材股份有限公司 | A kind of fractional crystallization method of beta crystal PPR pipe extrusion |
| CN105333235A (en) * | 2015-08-28 | 2016-02-17 | 湖北荆塑科技发展有限公司 | Antibacterial kitchen and bathroom pipe and production technology |
| CN107877874A (en) * | 2017-12-14 | 2018-04-06 | 上海邦临机械设备有限公司 | A kind of heat radiating type ceramic honeycomb panel heat welded device |
| CN107877874B (en) * | 2017-12-14 | 2024-04-26 | 上海邦临管道工程技术有限公司 | Heat dissipation type ceramic honeycomb panel heating welding device |
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| CN101856867B (en) | 2013-03-20 |
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