WO2022012087A1 - 一种聚乳酸管材径向强化装置及强化方法 - Google Patents
一种聚乳酸管材径向强化装置及强化方法 Download PDFInfo
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- WO2022012087A1 WO2022012087A1 PCT/CN2021/083756 CN2021083756W WO2022012087A1 WO 2022012087 A1 WO2022012087 A1 WO 2022012087A1 CN 2021083756 W CN2021083756 W CN 2021083756W WO 2022012087 A1 WO2022012087 A1 WO 2022012087A1
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- Prior art keywords
- polylactic acid
- acid pipe
- blade
- radial
- rotating
- Prior art date
Links
- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 79
- 239000004626 polylactic acid Substances 0.000 title claims abstract description 79
- 238000005728 strengthening Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000007790 scraping Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 22
- 238000004017 vitrification Methods 0.000 claims description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 2
- 230000036760 body temperature Effects 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0072—After-treatment of articles without altering their shape; Apparatus therefor for changing orientation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/04—Macromolecular materials
- A61L31/06—Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L31/148—Materials at least partially resorbable by the body
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2240/00—Manufacturing or designing of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2240/001—Designing or manufacturing processes
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
- B29C2071/027—Tempering, i.e. heating an object to a high temperature and quenching it
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/04—Polyesters derived from hydroxycarboxylic acids
- B29K2067/046—PLA, i.e. polylactic acid or polylactide
-
- 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
Definitions
- the invention relates to the field of medical equipment, in particular to a radial strengthening device and a strengthening method for a polylactic acid pipe.
- Biodegradable stents become a possible alternative to traditional metal stents because they are degraded in the human environment and absorbed and metabolized by the body.
- bioscaffolds have problems of poor support and toughness.
- Chinese patent document CN201711213237.8 discloses a method for preparing a polylactic acid and its copolymer stent.
- the original pipe material is put into a tubular mold and heated, and high-pressure gas is injected into the original pipe material to make the pipe material in the
- the radial direction can achieve a high degree of orientation, and the pipe is also axially stretched in the axial direction of the pipe to achieve simultaneous orientation of the pipe in the radial and axial directions, so that the material has strength and toughness in the radial and axial directions. greatly improved.
- a perfect crystallization system is formed, and the internal stress of the tube is released, which effectively improves the support force and toughness of the stent immediately and after storage, and reduces the fracture phenomenon during the retraction and expansion of the stent. .
- this method belongs to the inflation method, and the wall thickness of the inflated tube cannot be precisely controlled. Since the diameter of the tube expands from small to small, it is prone to radial retraction under the influence of body temperature after being implanted in the body, and the tube is stretched in the axial direction. , after being implanted in the body, it is prone to axial retraction under the influence of body temperature.
- the present invention aims to develop a non-inflation type new radial strengthening device and strengthening method for polylactic acid pipes, so that the uniformity of the pipe wall thickness is better, the inner and outer diameters are more accurate, and there is no shaft. Therefore, the polylactic acid pipe has no radial and axial retraction after the strengthening, and no thermal creep in the low temperature range (body temperature, etc.).
- the present invention provides a radial strengthening device for polylactic acid pipes, the device includes a tubular mold, a rotating blade and a distal blade; the rotating shaft of the rotating blade is arranged at the axial position of the tubular mold , and can rotate relative to the axis position; the first end of the distal blade is movably connected with the end of the rotating blade away from the rotating shaft; the second end of the distal blade is connected with the control rod,
- the opening and closing are realized under the control of the control rod, and the swing center is the connection between the distal blade and the rotating blade.
- tubular mold is a metal piece.
- the second end of the distal blade is rounded.
- the rotating blade is made of anti-rust material.
- anti-rust material is anti-rust metal.
- the present invention also discloses a method for radially strengthening polylactic acid pipes by using a polylactic acid pipe radial strengthening device, the method comprising the following steps:
- Step 1 loading the polylactic acid pipe to be strengthened into the strengthening device, heating the strengthening device to a first temperature, and maintaining a first preset time period;
- Step 2 rotating the rotating blade of the strengthening device according to a constant direction, while the distal blade of the strengthening device is opened at a first speed, so that the second end of the strengthening device is close to the metal mold of the strengthening device;
- Step 3 When the distal blade is opened by more than 2°, the opening of the distal blade is suspended and heated to a second temperature T2;
- Step 4 After pressing and scraping for a second preset time period, the distal blade is closed at a second speed and restored to the initial state;
- Step 5 lowering the strengthening device to room temperature
- Step 6 Take out the strengthened polylactic acid pipe, and cut off the redundant pipe sections at both ends of the polylactic acid pipe.
- the first temperature is higher than the initial temperature T1 of vitrification of the polylactic acid pipe.
- the second temperature is the termination temperature T2 of the vitrification of the polylactic acid pipe.
- the first preset time period is 5min-30min.
- the first preset time period is 5min.
- the first preset time period is 20min.
- the first preset time period is 30min
- the first speed is 0.1°/min.
- the second speed is 0.1°/min.
- the rotational speed of the rotating blade is 1-20 rpm.
- the rotating speed of the rotating blade is 20-60 rpm.
- the one constant direction is that the rotating blade rotates along its rotation axis, thereby driving the distal blade along the swing center of the distal blade and facing away from the distal blade.
- the second preset time period refers to the molecular chain of the polylactic acid pipe being oriented along the rotation direction of the rotating blade, which is used for changing from disordered arrangement to circumferential orientation. time.
- the length of the pipe section where the two ends of the polylactic acid pipe are cut off is 2mm.
- the pipe is limited by the external metal heating element, and the outer diameter of the pipe will not change. During the extrusion and scraping process, there may be some leakage of the pipe at both ends, resulting in a slight expansion of the inner diameter. After the processing is completed The uniformity of the pipe can be ensured by cutting off the overflowing parts at both ends of the pipe. Therefore, the reinforced pipe has better wall thickness uniformity, more accurate inner and outer diameters, no shrinkage of the reinforced diameter, and no axial orientation, so that the polylactic acid pipe has no radial and axial shrinkage after the strengthening, and at low temperature There is no thermal creep in the interval (body temperature, etc.).
- the machining process is carried out at a lower rotational speed.
- the rotational speed can be increased accordingly to achieve precise temperature control. If the rotational speed is too high, it will cause friction and heat during processing, which will affect the temperature control of the pipe and lead to radial strengthening effect. not good.
- FIG. 1 is a schematic diagram of a strengthening device according to a preferred embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view of the working process of a strengthening device according to a preferred embodiment of the present invention
- FIG. 3 is a partially enlarged cross-sectional schematic view of the working process of the strengthening device according to a preferred embodiment of the present invention.
- FIG. 4 is a schematic diagram of a preferred embodiment of the present invention in which the molecular chains of the pipe material are arranged with disordered to ordered changes;
- a radial strengthening device for polylactic acid pipe includes a metal mold 1, a rotating blade 3, a distal blade 4 and a control rod 5, wherein the metal mold 1 is tubular, and its inner wall is used for setting Polylactic acid pipe material 2 to be strengthened.
- the rotating blade 3 , the distal blade 4 , and the control rod 5 are all arranged inside the metal mold 1 .
- the rotating shaft 31 of the rotating blade 3 is provided at the axial center position of the tubular metal mold 1 , and the rotating blade 3 is rotatable relative to the axial center position of the metal mold 1 .
- One end of the rotating blade 3 is connected to the rotating shaft 31, and the other end is movably connected to the first end 41 of the distal blade 4 to form a first movable connection 32; the second end 42 of the distal blade 4 opposite to the first end 41 Actively connected with the control rod 5.
- the control rod 5 can control the distal blade 4 to swing around the first movable connection 32 (that is, take the first movable connection 32 as the swing center), so that the angle between the distal blade 4 and the metal mold 1 changes, wherein The direction in which the angle increases is the direction in which the distal blade 4 opens.
- the angle value when the included angle between them reaches the maximum value is determined according to actual needs, and the specific value thereof does not constitute a limitation to the present application.
- the direction in which the included angle becomes smaller is the direction in which the distal blade 4 is closed.
- the control rod 5 can control the distal blade 4 to swing, so as to control the opening and closing of the distal blade 4 .
- Figures 2 and 3 show the working process of the strengthening device: (a) represents the initial state, (b) represents the opening process of the distal blade 4, (c) represents the state when the distal blade 4 is fully opened, (d) The process of closing the distal blade 4 is shown, and (e) shows the state in which the distal blade 4 is completely closed.
- the second end 42 of the distal blade 4 may be rounded.
- the metal mold 1 can be made of metal with good thermal conductivity.
- the rotating blade 3 can be made of rust-proof material, preferably, rust-proof metal.
- the following describes a method for radially strengthening a polylactic acid pipe by using the above-mentioned radial strengthening device for a polylactic acid pipe.
- the polylactic acid pipe material 2 to be strengthened is loaded into the metal mold 1, the wall thickness of the polylactic acid pipe material 2 is 50-100um, and the metal mold 1 is heated to exceed the starting point of vitrification of the polylactic acid pipe material
- the temperature is T1
- the temperature is kept for 5 minutes; then the rotating blade 3 is rotated along the rotating shaft 31, and its rotation direction is shown in the X direction in Figures 2 and 3, thereby driving the distal blade 4 to rotate, wherein the X direction is along the distal blade.
- the rotating speed of the rotating blade 3 is controlled at 20-60 rpm, and the distal blade 4 is continued to be opened until the distal blade 4 is fully opened; after a period of squeezing and scraping, the distal blade 4 Turn off at a speed of 0.1°/min and return to the initial state; lower the metal mold 1 to normal temperature, take out the reinforced polylactic acid pipe 2, and cut off the 2mm excess pipe sections at both ends of the processed pipe.
- the polylactic acid tube 2 is squeezed and scraped by the distal blade 4, and its molecular chain is oriented along the rotation direction of the blade, so as to change from disordered arrangement to circumferential orientation as shown in FIG. 4 .
- the polylactic acid pipe material 2 to be strengthened is loaded into the metal mold 1, the wall thickness of the polylactic acid pipe material 2 is 150-200um, and the metal mold 1 is heated to exceed the starting point of vitrification of the polylactic acid pipe material
- the temperature is T1
- the temperature is kept for 20 minutes; then the rotating blade 3 is rotated along the rotating shaft 31, and its rotation direction is shown in the X direction in Figures 2 and 3, thereby driving the distal blade 4 to rotate, wherein the X direction is along the distal blade.
- the rotating speed of the rotating blade 3 is controlled at 20-60 rpm, and the distal blade 4 is continued to be opened until the distal blade 4 is fully opened; after a period of squeezing and scraping, the distal blade 4 Turn off at a speed of 0.1°/min and return to the initial state; lower the metal mold 1 to normal temperature, take out the reinforced polylactic acid pipe 2, and cut off the 2mm excess pipe sections at both ends of the processed pipe.
- the polylactic acid tube 2 is squeezed and scraped by the distal blade 4, and its molecular chain is oriented along the rotation direction of the blade, so as to change from disordered arrangement to circumferential orientation as shown in FIG. 4 .
- the polylactic acid pipe material 2 to be strengthened is loaded into the metal mold 1, the wall thickness of the polylactic acid pipe material 2 is 300-500um, and the metal mold 1 is heated to exceed the starting point of vitrification of the polylactic acid pipe material
- the temperature is T1
- the temperature is kept for 30 minutes; then the rotating blade 3 is rotated along the rotating shaft 31, and its rotation direction is shown in the X direction in Figures 2 and 3, thereby driving the distal blade 4 to rotate, wherein the X direction is along the distal blade.
- the rotating speed of the rotating blade 3 is controlled at 20-60 rpm, and the distal blade 4 is continued to be opened until the distal blade 4 is fully opened; after a period of squeezing and scraping, the distal blade 4 Turn off at a speed of 0.1°/min and return to the initial state; lower the metal mold 1 to normal temperature, take out the reinforced polylactic acid pipe 2, and cut off the 2mm excess pipe sections at both ends of the processed pipe.
- the polylactic acid tube 2 is squeezed and scraped by the distal blade 4, and its molecular chain is oriented along the rotation direction of the blade, so as to change from disordered arrangement to circumferential orientation as shown in FIG. 4 .
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Abstract
一种聚乳酸管材径向强化装置,包含管状模具、旋转叶片和远端叶片,旋转叶片的旋转轴设置于管状模具的轴心位置,远端叶片的第一端与旋转叶片活动连接,第二端由一根控制杆操控,使其打开和闭合。一种使用上述聚乳酸管材径向强化装置的强化方法,包括将待强化的聚乳酸管材装入强化装置内,加热第一预设时间;旋转叶片按照恒定方向旋转,同时远端叶片打开,其第二端接近管状模具,经过第二预设时间的挤压和刮擦后,远端叶片关闭恢复到初始状态;将强化装置降至室温,取出强化后的聚乳酸管材并切除多余段。经上述强化装置和方法强化后的管材,其壁厚均匀性更好、内外径尺寸更精准、无轴向取向,在低温区间(体温等)无热蠕变。
Description
本发明涉及医用器材领域,尤其涉及一种聚乳酸管材径向强化装置及强化方法。
生物可降解支架因为在人体环境内会降解并被人体吸收、代谢,成为传统金属支架可能的一种替代方案。但是生物支架存在支撑力和韧性差的问题。为了解决该问题,中国专利文献CN201711213237.8公开了一种聚乳酸及其共聚物支架的制备方法,将原始管材放入管状模具中并进行加热,并向原始管材内注入高压气体,使管材在径向方向能实现高度取向,并且还沿管材轴向方向对管材进行轴向拉伸,以实现管材在径向方向和轴向方向的同时取向,使材料在径向和轴向的强度和韧性得到大幅度提高。并且,通过一定时间的退火,形成完善的结晶体系,并释放了管材的内应力,有效提高了支架在即刻以及存储后的支撑力和韧性,降低了支架的回缩和扩张过程中的断裂现象。
但是该方法属于吹胀方法,吹胀成型的管材壁厚无法精确控制,由于管材的直径由小扩大,在植入体内后受到体温影响容易发生径向回缩,管材在轴向上被拉伸,在植入体内后受到体温影响容易发生轴向回缩。
因此,本领域的技术人员致力于开发一种不通过吹胀方式而使聚乳酸管材径向强化的强化装置以及强化方法。
发明内容
有鉴于现有技术的上述缺陷,本发明旨在开发一种非吹胀式的新型聚乳酸管材径向强化装置以及强化方法,使管材壁厚均匀性更好、内外径尺寸更精准、无轴向取向,从而聚乳酸管材在强化完成后无径向和轴向回缩,在低温区间(体温等)无热蠕变。
为实现上述目的,本发明提供了一种聚乳酸管材径向强化装置,所述装置包含管状模具、旋转叶片和远端叶片;所述旋转叶片的旋转轴设置于所述管状模具的轴心位置,并能相对所述轴心位置旋转;所述远端叶片的第一端与所述旋转叶片上远离所述旋转轴的一端活动连接;所述远端叶片的第二端与控制杆连接,并在所述控制杆的操控下实现打开和闭合,并以所述远端叶片与所述旋转叶片连接处为摆动中心。
进一步地,所述管状模具为金属件。
进一步地,所述远端叶片的所述第二端呈圆角。
进一步地,所述旋转叶片为防锈材料制成。
进一步地,所述防锈材料为防锈金属。
第二方面,本发明还公开了一种使用聚乳酸管材径向强化装置进行聚乳酸管材径向强化方法,该方法包括以下步骤:
步骤1、将待强化的所述聚乳酸管材装入所述强化装置内,将所述强化装置加热到第一温度,并保持第一预设时间段;
步骤2、将所述强化装置的旋转叶片按照一个恒定方向旋转,同时所述强化装置的远端叶片以第一速度打开,使其第二端接近所述强化装置的金属模具;
步骤3、当所述远端叶片打开超过2°时,暂停所述远端叶片的打开,加热至第二温度T2;
到达所述第二温度后,继续打开所述远端叶片,直至所述远端叶片完全打开;
步骤4、经过第二预设时间段的挤压和刮擦后,将所述远端叶片以第二速度关闭恢复到初始状态;
步骤5、将所述强化装置降至室温;
步骤6、取出强化后的所述聚乳酸管材,将所述聚乳酸管材的两端的多余管段切除。
进一步地,在所述步骤1中,所述第一温度为高于聚乳酸管材玻璃化的起始温度T1。
进一步地,在所述步骤3中,所述第二温度为聚乳酸管材玻璃化的终止温度T2。
进一步地,在所述步骤1中,所述第一预设时间段为5min-30min。
进一步地,如果所述聚乳酸管材的壁厚为50-500um,所述第一预设时间段为5min。
进一步地,如果所述聚乳酸管材的壁厚为150-200um,所述第一预设时间段为20min。
进一步地,如果所述聚乳酸管材的壁厚为300-500um,所述第一预设时间段为30min
进一步地,在所述步骤2中,所述第一速度为0.1°/min。
进一步地,在所述步骤4中,所述第二速度为0.1°/min。
进一步地,在所述步骤2中,所述旋转叶片的转速为1-20rpm。
进一步地,在所述步骤3中,所述旋转叶片的转速为20-60rpm。
进一步地,在所述步骤2中,所述一个恒定方向是所述旋转叶片沿着其旋转轴转动,从而带动所述远端叶片沿着所述远端叶片的摆动中心并背向所述远端叶片的第二端进行旋转的方向。
进一步地,在所述步骤4中,所述第二预设时间段是指所述聚乳酸管材的分子链沿所述旋转叶片的旋转方向进行取向,由无序排列变为周向取向所用的时间。
进一步地,在所述步骤6中,所述聚乳酸管材的所述两端被切除的所述管段的长 度为2mm。
本发明具有以下技术效果:
1)管材受到外部金属加热件的限制,管材外径不会发生变化,挤压和刮擦过程中可能会有些许管材由在两端发生外溢的现象,导致内径会有略微扩大,加工完成后将管材两端外溢部分切除即可保证管材的均匀性。因此,强化后的管材壁厚均匀性更好、内外径尺寸更精准、强化完直径无回缩,无轴向取向,从而聚乳酸管材在强化完成后无径向和轴向回缩,在低温区间(体温等)无热蠕变。
2)通过控制转速,加工过程以较低转速进行,随着温度的上升转速可以相应提升,实现温度精确控制,如果转速过高会导致加工过程中摩擦发热,影响管材温度控制导致径向强化效果不佳。
以下将结合附图对本发明的构思、具体结构及产生的技术效果作进一步说明,以充分地了解本发明的目的、特征和效果。
图1是本发明的一个较佳实施例强化装置的示意图;
图2是本发明的一个较佳实施例强化装置的工作过程的截面示意图;
图3是本发明的一个较佳实施例强化装置的工作过程的局部放大截面示意图;
图4是本发明的一个较佳实施的管材分子链排列有无序到有序变化的示意图;
其中1-金属模具,2-聚乳酸管材,3-旋转叶片,31-旋转轴,32-第一活动连接处,4-远端叶片,41-远端叶片的第一端,42-远端叶片的第二端,5-控制杆。
以下参考说明书附图介绍本发明的多个优选实施例,使其技术内容更加清楚和便于理解。本发明可以通过许多不同形式的实施例来得以体现,本发明的保护范围并非仅限于文中提到的实施例。
在附图中,结构相同的部件以相同数字标号表示,各处结构或功能相似的组件以相似数字标号表示。附图所示的每一组件的尺寸和厚度是任意示出的,本发明并没有限定每个组件的尺寸和厚度。为了使图示更清晰,附图中有些地方适当夸大了部件的厚度。
如图1和图2所示,一种聚乳酸管材径向强化装置,包括金属模具1、旋转叶片3、远端叶片4和控制杆5,其中,金属模具1呈管状,其内壁用于设置待强化的聚乳酸管材2。旋转叶片3、远端叶片4、控制杆5均设置在金属模具1的内部。旋转叶片3的旋转轴31设置在呈管状的金属模具1的轴心位置,旋转叶片3能够相对金属模具1的轴心位置旋转。旋转叶片3的一端连接至旋转轴31,另一端与远端叶片4的第一端41活动连接,形成第一活动连接处32;远端叶片4上与第一端41相对的第二端42 与控制杆5活动连接。控制杆5能够控制远端叶片4围绕第一活动连接处32摆动(即以第一活动连接处32为摆动中心),从而使远端叶片4与金属模具1之间的夹角发生变化,其中夹角变大的方向为远端叶片4打开的方向,当远端叶片4与金属模具1之间的夹角达到最大时,远端叶片4完全打开;其中,远端叶片4与金属模具1之间的夹角达到最大时的角度值根据实际需求确定,其具体数值不构成对本申请的限制。其中夹角变小的方向为远端叶片4闭合的方向。控制杆5能够控制远端叶片4摆动,从而达到控制远端叶片4打开和闭合。
图2和图3示出了强化装置的工作过程:(a)表示初始状态,(b)表示远端叶片4的打开过程,(c)表示远端叶片4完全打开时的状态,(d)表示远端叶片4闭合的过程,(e)表示远端叶片4完全闭合的状态。
远端叶片4的第二端42处可以设置为呈圆角。
金属模具1可以采用导热性能好的金属制造而成。旋转叶片3可以采用防锈材料制成,较佳地,采用防锈金属制成。
以下通过若干个实施例,来描述使用上述聚乳酸管材径向强化装置对聚乳酸管材径向进行强化的方法。
实施例1
如图1、图2和图3所示,将待强化的聚乳酸管材2装入金属模具1内,聚乳酸管材2壁厚50-100um,加热金属模具1至超过聚乳酸管材玻璃化起始温度T1,保温5min;然后使旋转叶片3沿着旋转轴31旋转,其旋转方向如图2和3中的X方向所示,从而带动远端叶片4转动,其中X方向为沿着远端叶片4的摆动中心且背向远端叶片4的第二端42的方向,旋转叶片3的转速控制在1-20rpm之间,同时用控制杆5控制远端叶片4以0.1°/min的速度打开,逐渐接近金属模具1;远端叶片4打开超过2°时,暂停远端叶片4的打开,提升温度至聚乳酸管材玻璃化的终止温度T2。到达终止温度T2后,将旋转叶片3的转速控制在20-60rpm,继续打开远端叶片4,直至远端叶片4完全打开;经过一段时间的挤压和刮擦后,所述远端叶片4以0.1°/min的速度关闭恢复到初始状态;将金属模具1降至常温,取出强化后的聚乳酸管材2,切除加工后的管道两端2mm多余管段。旋转过程中聚乳酸管材2受到远端叶片4的挤压和刮擦,其分子链沿叶片旋转方向进行取向,从而达到如图4所示由无序排列变为周向取向。
实施例2
如图1、图2和图3所示,将待强化的聚乳酸管材2装入金属模具1内,聚乳酸管材2壁厚150-200um,加热金属模具1至超过聚乳酸管材玻璃化起始温度T1,保温20min;然后使旋转叶片3沿着旋转轴31旋转,其旋转方向如图2和3中的X方向所示,从而带动远端叶片4转动,其中X方向为沿着远端叶片4的摆动中心且背向远 端叶片4的第二端42的方向,旋转叶片3的转速控制在1-20rpm之间,同时用控制杆5控制远端叶片4以0.1°/min的速度打开,逐渐接近金属模具1;远端叶片4打开超过2°时,暂停远端叶片4的打开,提升温度至聚乳酸管材玻璃化的终止温度T2。到达终止温度T2后,将旋转叶片3的转速控制在20-60rpm,继续打开远端叶片4,直至远端叶片4完全打开;经过一段时间的挤压和刮擦后,所述远端叶片4以0.1°/min的速度关闭恢复到初始状态;将金属模具1降至常温,取出强化后的聚乳酸管材2,切除加工后的管道两端2mm多余管段。旋转过程中聚乳酸管材2受到远端叶片4的挤压和刮擦,其分子链沿叶片旋转方向进行取向,从而达到如图4所示由无序排列变为周向取向。
实施例3
如图1、图2和图3所示,将待强化的聚乳酸管材2装入金属模具1内,聚乳酸管材2壁厚300-500um,加热金属模具1至超过聚乳酸管材玻璃化起始温度T1,保温30min;然后使旋转叶片3沿着旋转轴31旋转,其旋转方向如图2和3中的X方向所示,从而带动远端叶片4转动,其中X方向为沿着远端叶片4的摆动中心且背向远端叶片4的第二端42的方向,旋转叶片3的转速控制在1-20rpm之间,同时用控制杆5控制远端叶片4以0.1°/min的速度打开,逐渐接近金属模具1;远端叶片4打开超过2°时,暂停远端叶片4的打开,提升温度至聚乳酸管材玻璃化的终止温度T2。到达终止温度T2后,将旋转叶片3的转速控制在20-60rpm,继续打开远端叶片4,直至远端叶片4完全打开;经过一段时间的挤压和刮擦后,所述远端叶片4以0.1°/min的速度关闭恢复到初始状态;将金属模具1降至常温,取出强化后的聚乳酸管材2,切除加工后的管道两端2mm多余管段。旋转过程中聚乳酸管材2受到远端叶片4的挤压和刮擦,其分子链沿叶片旋转方向进行取向,从而达到如图4所示由无序排列变为周向取向。
以上详细描述了本发明的较佳具体实施例。应当理解,本领域的普通技术无需创造性劳动就可以根据本发明的构思作出诸多修改和变化。因此,凡本技术领域中技术人员依本发明的构思在现有技术的基础上通过逻辑分析、推理或者有限的实验可以得到的技术方案,皆应在由权利要求书所确定的保护范围内。
Claims (20)
- 一种聚乳酸管材径向强化装置,其中,所述装置包含管状模具、旋转叶片和远端叶片;所述旋转叶片的旋转轴设置于所述管状模具的轴心位置,并能相对所述轴心位置旋转;所述远端叶片的第一端与所述旋转叶片上远离所述旋转轴的一端活动连接;所述远端叶片的第二端与控制杆连接,并在所述控制杆的操控下实现打开和闭合,并以所述远端叶片与所述旋转叶片连接处为摆动中心。
- 如权利要求1所述的聚乳酸管材径向强化装置,其中,所述管状模具为金属件。
- 如权利要求1所述的聚乳酸管材径向强化装置,其中,所述远端叶片的所述第二端呈圆角。
- 如权利要求1所述的聚乳酸管材径向强化装置,其中,所述旋转叶片为防锈材料制成。
- 如权利要求4所述的聚乳酸管材径向强化装置,其中,所述防锈材料为防锈金属。
- 如权利要求1所述的聚乳酸管材径向强化装置,其中,所述聚乳酸管材的壁厚为50-500um。
- 一种使用如权利要求1所述的聚乳酸管材径向强化装置进行聚乳酸管材径向强化方法,其中,所述方法包括以下步骤:步骤1、将待强化的所述聚乳酸管材装入所述强化装置内,将所述强化装置加热到第一温度,并保持第一预设时间段;步骤2、将所述强化装置的旋转叶片按照一个恒定方向旋转,同时所述强化装置的远端叶片以第一速度打开,使其第二端接近所述强化装置的金属模具;步骤3、当所述远端叶片打开超过2°时,暂停所述远端叶片的打开,加热至第二温度T2;到达所述第二温度后,继续打开所述远端叶片,直至所述远端叶片完全打开;步骤4、经过第二预设时间段的挤压和刮擦后,将所述远端叶片以第二速度关闭恢复到初始状态;步骤5、将所述强化装置降至室温;步骤6、取出强化后的所述聚乳酸管材,将所述聚乳酸管材的两端的多余管段切除。
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤1中,所述第一温度为高于聚乳酸管材玻璃化的起始温度T1。
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤3中,所述第二温度为聚乳酸管材玻璃化的终止温度T2。
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤1中,所述第一预设时间段为5min-30min。
- 如权利要求10所述的聚乳酸管材径向强化方法,其中,如果所述聚乳酸管材的壁厚为50-500um,所述第一预设时间段为5min。
- 如权利要求10所述的聚乳酸管材径向强化方法,其中,如果所述聚乳酸管材的壁厚为150-200um,所述第一预设时间段为20min。
- 如权利要求10所述的聚乳酸管材径向强化方法,其中,如果所述聚乳酸管材的壁厚为300-500um,所述第一预设时间段为30min
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤2中,所述第一速度为0.1°/min。
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤4中,所述第二速度为0.1°/min。
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤2中,所述旋转叶片的转速为1-20rpm。
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤3中,所述旋转叶片的转速为20-60rpm。
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤2中,所述一个恒定方向是所述旋转叶片沿着其旋转轴转动,从而带动所述远端叶片沿着所述远端叶片的摆动中心并背向所述远端叶片的第二端进行旋转的方向。
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤4中,所述第二预设时间段是指所述聚乳酸管材的分子链沿所述旋转叶片的旋转方向进行取向,由无序排列变为周向取向所用的时间。
- 如权利要求7所述的聚乳酸管材径向强化方法,其中,在所述步骤6中,所述聚乳酸管材的所述两端被切除的所述管段的长度为2mm。
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