CN110948811A - Polymer crystallization on-line measuring device - Google Patents

Polymer crystallization on-line measuring device Download PDF

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Publication number
CN110948811A
CN110948811A CN201911202380.6A CN201911202380A CN110948811A CN 110948811 A CN110948811 A CN 110948811A CN 201911202380 A CN201911202380 A CN 201911202380A CN 110948811 A CN110948811 A CN 110948811A
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CN
China
Prior art keywords
pressure head
polymer
crystallization
displacement
detection device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911202380.6A
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Chinese (zh)
Inventor
曾广胜
江太君
陈一
孟聪
胡灿
尹琛
刘水长
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Lingyue New Material Co.,Ltd.
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Hunan University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan University of Technology filed Critical Hunan University of Technology
Priority to CN201911202380.6A priority Critical patent/CN110948811A/en
Publication of CN110948811A publication Critical patent/CN110948811A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
    • G01N25/147—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation by cristallisation
    • 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
    • B29C2945/76003—Measured parameter
    • B29C2945/7604—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
    • B29C2945/76003—Measured parameter
    • B29C2945/76133—Crystallinity

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses an on-line detection device for polymer crystallization, wherein a polymer melt cooling well and a product have the same mold temperature, a pressure head is arranged to fully contact polymer materials filled in the cooling well and apply certain force, and the displacement of the pressure head can accurately detect the change of the displacement of the pressure head along with time through a displacement sensor. The device has simple structure and convenient use, can precisely monitor the crystallization behavior of the pressure head in the cooling process of the polymer material melt in the injection molding cooling process on line, and has very important practical guiding significance for optimizing the crystallization forming of polymer products.

Description

Polymer crystallization on-line measuring device
Technical Field
The invention relates to the technical field of detection devices, in particular to an online detection device for polymer crystallization.
Background
The polymer is a bio-based environment-friendly material which is prepared by taking natural starch as a main raw material through processes of biological fermentation, chemical polymerization and the like and can be completely biodegraded, and is rapidly popularized and applied in the fields of medical treatment and daily consumer goods due to excellent biodegradability and biocompatibility. However, pure polymers have poor heat resistance and a heat distortion temperature of only about 55 ℃, which limits the application of the pure polymers in many occasions, especially in the field of daily necessities with particularly large market consumption. The controllable crystallization of the injection molding process can be realized by carrying out formula design on the polymer material, and the injection crystallization of the polyacid material occurs in the cooling process after the injection molding is finished. Whether the crystallization process is finished by a product is difficult to directly detect in the traditional polymer injection molding process, the sufficient crystallization of the polymer product is often ensured by properly prolonging the injection molding heat preservation period, but the experimental parameter setting based on experience can lead to the prolongation of the molding period of the injection molding product, the accurate molding period control cannot be realized, and the processing efficiency of the product is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing an on-line detection device for polymer crystallization aiming at the defect of unknown crystallization detection state of the existing mold.
The purpose of the invention is realized by the following technical scheme:
the polymer crystallization on-line detection device comprises a processing unit, a temperature sensing unit, a crystallization detection unit and a mold unit; the processing unit is connected with the temperature sensing unit and the displacement sensing unit, and the temperature sensing unit and the displacement sensing unit are installed on the die unit.
Further, the mold unit is provided with a cooling device and a heating device.
Further, the cooling device is provided with a cooling water or cooling gas channel in the mould.
Further, the mould unit comprises a pouring gate, a flow channel, a cold material well and a cavity.
Further, the displacement sensing unit is installed at the cold material well.
Further, the displacement sensing unit comprises a pressure head and a displacement sensor, and the pressure head is connected with the displacement sensor.
Further, the pressure head is arranged at the bottom of the cold material well.
Further, the pressure of the ram is adjustable.
Compared with the prior art, the beneficial effects are:
the invention applies a certain pressure to the polymer material in the injection molding cooling process by a precision monitoring pressure head, and detects the displacement mutation position of the pressure head to detect the crystallization behavior of the polymer material melt in the cooling process on line. The injection molding machine injects polymer melt into an injection mold cavity at high speed through a sprue through a runner to form a product, the polymer melt is simultaneously injected into a cold material well in the injection molding process, and the product has the same mold temperature and similar processing flow. The pressure head fully contacts the polymer material filled in the cold charge well, and applies a certain force, and the displacement sensor can accurately detect the change of the displacement of the pressure head along with the time. The polymer melt in the cold charge well is the same as the melt in the product, and is gradually cooled under the regulation and control of the temperature of the mould after the injection process is finished, when the cooling temperature enters a crystallization temperature interval, the material is quickly crystallized, the hardness of the crystallized polymer material is quickly improved, the displacement of a pressure head is quickly reduced, obvious mutation is generated, and the mutation position is the position with the highest crystallization speed.
The device has simple structure and convenient use, and has very important practical guiding significance for optimizing the crystallization forming of polymer products.
Drawings
FIG. 1 is a schematic view of displacement sensing.
The device comprises a cavity 1, a runner 2, a sprue 3, a pressure head 4, a displacement sensor 5 and a cold material well 6.
Detailed Description
The following examples are further explained and illustrated, but the present invention is not limited in any way by the specific examples. Unless otherwise indicated, the methods and equipment used in the examples are conventional in the art and all materials used are conventional commercially available materials.
Example 1
The embodiment provides an on-line detection device for polymer crystallization.
The polymer crystallization on-line detection device comprises a processing unit, a temperature sensing unit, a crystallization detection unit and a mold unit; the processing unit is connected with the temperature sensing unit and the displacement sensing unit, the displacement sensing unit comprises a pressure head and a displacement sensor 5, and the pressure head 4 is connected with the displacement sensor 5. The temperature sensing unit and the displacement sensing unit are mounted on the mold unit. The mould unit comprises a pouring gate 3, a flow channel 2, a cold burden well 6 and a cavity 1, wherein a pressure head 4 of the displacement sensing unit is arranged at the bottom of the cold burden well 6, and the pressure of the pressure head 4 is adjustable. A cooling device and a heating device are arranged in the die, and the cooling device is a cooling water or cooling gas channel arranged in the die.
Example 2
This example provides an on-line detection method for polymer crystallization using example 1.
According to the type and property of injection polymers, the parameter setting of the temperature and the pressure head of the mold is well adjusted, the molten polymers are injected into the cavity 1, the pressure head 4 is in full contact with the polylactic acid material filled in the cold charge well 6 and applies a certain force, the temperature of the mold is gradually adjusted to be reduced, when the temperature is close to the crystallization temperature region of the polymers, the polymers are crystallized, the volume is reduced, the displacement of the pressure head 4 is rapidly reduced, and obvious mutation is generated. The displacement sensor 5 and the temperature sensor transmit real-time temperature and displacement deviation data to the processing unit, and convey temperature and displacement deflection.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (8)

1. The polymer crystallization on-line detection device is characterized by comprising a processing unit, a temperature sensing unit, a crystallization detection unit and a mold unit; the processing unit is connected with the temperature sensing unit and the displacement sensing unit, and the temperature sensing unit and the displacement sensing unit are installed on the die unit.
2. The on-line polymer crystallization detection device according to claim 1, wherein the mold unit is provided with a cooling device and a heating device.
3. The on-line polymer crystallization detection device according to claim 2, wherein the cooling device is a cooling water or cooling gas channel arranged in the mold.
4. The on-line polymer crystallization detection device according to claim 1, wherein the mold unit comprises a gate, a runner, a cold material well and a cavity.
5. The on-line polymer crystallization detection device of claim 2, wherein the displacement sensing unit is installed at the cold material well.
6. The polymer crystallization on-line detection device of claim 1 or 3, wherein the displacement sensing unit comprises a pressure head and a displacement sensor, and the pressure head is connected with the displacement sensor.
7. The on-line polymer crystallization detection device as claimed in claim 6, wherein the pressure head is arranged at the bottom of the cold material well.
8. The on-line polymer crystallization detection device as claimed in claim 4, wherein the pressure of the pressure head is adjustable.
CN201911202380.6A 2019-11-29 2019-11-29 Polymer crystallization on-line measuring device Pending CN110948811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911202380.6A CN110948811A (en) 2019-11-29 2019-11-29 Polymer crystallization on-line measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911202380.6A CN110948811A (en) 2019-11-29 2019-11-29 Polymer crystallization on-line measuring device

Publications (1)

Publication Number Publication Date
CN110948811A true CN110948811A (en) 2020-04-03

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Family Applications (1)

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CN201911202380.6A Pending CN110948811A (en) 2019-11-29 2019-11-29 Polymer crystallization on-line measuring device

Country Status (1)

Country Link
CN (1) CN110948811A (en)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62198428A (en) * 1986-02-26 1987-09-02 Toshiba Corp Injection and compression molding
US5384079A (en) * 1993-01-06 1995-01-24 The United States Of America As Represented By The Secretary Of Commerce Method for detecting thermodynamic phase transitions during polymer injection molding
JPH09262887A (en) * 1996-03-29 1997-10-07 Toray Ind Inc Simulation method of mold shrinkage process in crystalline resin molding and device thereof
CN1190738A (en) * 1998-01-20 1998-08-19 山东大学 Method for real-time measuring crystal growth solid/liquid boundary and boundary layer structure
CN101544043A (en) * 2008-03-26 2009-09-30 宝理塑料株式会社 Injection molding process analysis method
CN102407595A (en) * 2011-07-29 2012-04-11 浙江大学 On-line measuring method and apparatus for degree of crystallization of polymer used for injection molding
JP2013028020A (en) * 2011-07-27 2013-02-07 Mazda Motor Corp Method of molding resin molded product
CN103320857A (en) * 2012-03-20 2013-09-25 上海中电振华晶体技术有限公司 Growth method and device for sapphire crystals
CN103358511A (en) * 2013-07-12 2013-10-23 浙江大学 On-line plastic crystallinity measuring method based on pressure sensor and temperature sensor
CN105473304A (en) * 2013-08-01 2016-04-06 艾姆弗勒克斯有限公司 Injection molding machines and methods for accounting for changes in material properties during injection molding runs
CN106738734A (en) * 2015-11-23 2017-05-31 郭洪 Die cavity information online detecting device in a kind of injection molding process
CN108274712A (en) * 2017-01-06 2018-07-13 陈炤彰 Method for manufacturing optical component with microstructure

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62198428A (en) * 1986-02-26 1987-09-02 Toshiba Corp Injection and compression molding
US5384079A (en) * 1993-01-06 1995-01-24 The United States Of America As Represented By The Secretary Of Commerce Method for detecting thermodynamic phase transitions during polymer injection molding
JPH09262887A (en) * 1996-03-29 1997-10-07 Toray Ind Inc Simulation method of mold shrinkage process in crystalline resin molding and device thereof
CN1190738A (en) * 1998-01-20 1998-08-19 山东大学 Method for real-time measuring crystal growth solid/liquid boundary and boundary layer structure
CN101544043A (en) * 2008-03-26 2009-09-30 宝理塑料株式会社 Injection molding process analysis method
JP2013028020A (en) * 2011-07-27 2013-02-07 Mazda Motor Corp Method of molding resin molded product
CN102407595A (en) * 2011-07-29 2012-04-11 浙江大学 On-line measuring method and apparatus for degree of crystallization of polymer used for injection molding
CN103320857A (en) * 2012-03-20 2013-09-25 上海中电振华晶体技术有限公司 Growth method and device for sapphire crystals
CN103358511A (en) * 2013-07-12 2013-10-23 浙江大学 On-line plastic crystallinity measuring method based on pressure sensor and temperature sensor
CN105473304A (en) * 2013-08-01 2016-04-06 艾姆弗勒克斯有限公司 Injection molding machines and methods for accounting for changes in material properties during injection molding runs
CN106738734A (en) * 2015-11-23 2017-05-31 郭洪 Die cavity information online detecting device in a kind of injection molding process
CN108274712A (en) * 2017-01-06 2018-07-13 陈炤彰 Method for manufacturing optical component with microstructure

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Address after: 410000 room 25004, phase II business complex building, Yunda Central Plaza, No. 567, Changsha Avenue, Lituo street, Yuhua District, Changsha City, Hunan Province

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Address before: 412007 No. 88 Taishan Road, Tianyuan District, Zhuzhou City, Hunan Province

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Application publication date: 20200403

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