WO2021187786A1 - Method for manufacturing multilayer sheet for transparent braces - Google Patents

Method for manufacturing multilayer sheet for transparent braces Download PDF

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Publication number
WO2021187786A1
WO2021187786A1 PCT/KR2021/002818 KR2021002818W WO2021187786A1 WO 2021187786 A1 WO2021187786 A1 WO 2021187786A1 KR 2021002818 W KR2021002818 W KR 2021002818W WO 2021187786 A1 WO2021187786 A1 WO 2021187786A1
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WIPO (PCT)
Prior art keywords
roll
polymer material
thermoplastic polymer
transparent
orthodontic
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PCT/KR2021/002818
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French (fr)
Korean (ko)
Inventor
권두연
임희정
장일석
송주동
Original Assignee
오스템임플란트 주식회사
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Publication of WO2021187786A1 publication Critical patent/WO2021187786A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
    • A61C7/08—Mouthpiece-type retainers or positioners, e.g. for both the lower and upper arch
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/144—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers using layers with different mechanical or chemical conditions or properties, e.g. layers with different thermal shrinkage, layers under tension during bonding

Definitions

  • the present invention relates to a method for manufacturing a multi-layered sheet for transparent orthodontics, and more particularly, to a transparent orthodontic material necessary for orthodontic procedures. It relates to a method for manufacturing a transparent orthodontic multi-layer sheet that is configured to have a high stability of the orthodontic device and safety when worn by a patient.
  • Orthodontic treatment is a therapeutic action applied to treat irregular tooth arrangement or abnormal interlocking of upper and lower jaws.
  • treatment is performed using brackets and wires for orthodontic treatment, and metal brackets and wires are used to apply orthodontic force to teeth.
  • metal brackets and wires they are not aesthetically good, and since treatment is carried out by fixing them to the teeth, there is a disadvantage that more attention should be paid to the cleanliness of the oral cavity.
  • the transparent orthodontic device is used for treatment by molding a polymer sheet to suit the patient's oral cavity through vacuum thermoforming.
  • Most of the conventional polymer sheets are composed of polyethylene terephthalate glycol (PETG).
  • PETG polyethylene terephthalate glycol
  • Transparent orthodontic devices made of conventional polymer sheets, including PETG have a characteristic that the pain applied to the patient at the initial stage of wearing the device is great, and the orthodontic force applied to the teeth decreases over time. This causes discomfort and pain to the patient, and gives the teeth a lower orthodontic force unlike the initial one, resulting in tooth movement that does not match the predicted results.
  • a multi-layer sheet (Polyester-TPU) has been developed to improve this, but there is a disadvantage in that the interlayer bonding strength is weak due to the difference in thermal properties. Due to this, delamination occurs when applying orthodontic products, which causes performance degradation, and the peeled layer exists in the patient's mouth or enters the digestive tract, affecting patient safety. Therefore, there is a need for a material with increased long-term stability of the orthodontic device and safety when wearing the device by a patient through improved interlayer bonding.
  • the present invention is to solve the problems of the prior art described above, and an object of the present invention relates to a method for manufacturing a multi-layered sheet for transparent orthodontics, and more particularly, it is a transparent orthodontic material necessary for orthodontic surgery and is composed of multiple layers. It is to provide a method for manufacturing a transparent orthodontic multi-layer sheet that can increase orthodontic retention, reduce patient pain, and increase stability of orthodontic devices and safety when worn by patients by having excellent interlayer bonding and durability.
  • one aspect of the present invention is a step of (a) mounting the soft thermoplastic polymer material in a roll state to the upper roll and the lower roll of the laminator, respectively, (b) the upper roll and the lower roll Raising the temperature, (c) laminating the roll sheets of the soft thermoplastic polymer material mounted on the upper roll and the lower roll in a pressing roll, and (d) laminating the soft thermoplastic polymer material while the soft thermoplastic polymer material is being laminated
  • It provides a method of manufacturing a multi-layer sheet for transparent correction comprising the step of mounting a thermoplastic polymer material on a central roll of a laminator and inserting it into the pressing roll in progress of lamination to prepare a multi-layer sheet.
  • the elevated temperature of the upper roll and the lower roll may be a transparent correction multi-layer sheet manufacturing method, characterized in that 110 to 140 °C.
  • the pressure of the pressing roll may be a method of manufacturing a multi-layer sheet for transparent correction, characterized in that 0.2 to 1.0 KPa.
  • the lamination speed of the pressing roll may be a method of manufacturing a multi-layered sheet for transparent correction, characterized in that 0.5 to 4.5 m/min.
  • the flexible thermoplastic polymer material may be a transparent orthodontic multi-layer sheet manufacturing method, characterized in that the flexible polyurethane.
  • the rigid thermoplastic polymer material may be a method for manufacturing a multi-layer sheet for transparent correction, characterized in that the rigid polyurethane.
  • the flexible thermoplastic polymer material may be a transparent orthodontic multi-layer sheet manufacturing method, characterized in that having a hardness (hardness) of 85 to 95A.
  • the rigid thermoplastic polymer material has a yield strength of 40 MPa or more and 60 MPa or less, and has an elastic modulus (Young's modulus) of 1500 MPa or more and 2200 MPa or less. It may be a method of making a layer sheet.
  • the transparent orthodontic multi-layer sheet manufactured according to the present invention has excellent orthodontic holding power due to less deformation at the tooth deformed position for a long period of time compared to conventional materials, and has excellent durability and safety when wearing the patient due to excellent interlayer bonding strength. can be improved
  • the outer layer is made of a soft polymer material to give flexibility, it is possible to reduce the pain of the patient during the initial correction.
  • the intermediate layer is made of a hard polymer material and has high elastic recovery force, interlayer bonding strength and durability with the outer layer may be improved.
  • FIG. 1 is a perspective view showing a multi-layered sheet for transparent correction manufactured according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram showing a method of manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating a method for manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention.
  • FIG. 5 is a graph comparing peel strength between a multi-layer sheet for transparent correction manufactured according to an embodiment of the present invention and a conventional material.
  • FIG. 6 is a photograph comparing the recovery rate after deformation between the multi-layer sheet for transparent correction prepared according to an embodiment of the present invention and a conventional material.
  • FIG. 7 is a graph comparing the retention rate of orthodontic force between the multi-layer sheet for transparent correction prepared according to an embodiment of the present invention and a conventional material.
  • FIG. 1 is a perspective view showing a multi-layered sheet for transparent correction manufactured according to an embodiment of the present invention.
  • the transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention has a triple-layer structure including a first outer layer 100 , a second outer layer 200 and an intermediate layer 300 .
  • a first outer layer 100 a first outer layer 100
  • a second outer layer 200 a second outer layer 200
  • an intermediate layer 300 a third layer
  • the transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention differs from the conventional single-layer material sheet by configuring the material of the outer layer in contact with the soft tissue in the oral cavity and the inner layer providing rigidity differently over time. It can reduce discomfort and pain inflicted to the patient while maintaining the corrective power.
  • the first outer layer 100 and the second outer layer 200 constitute the outer layer of the transparent orthodontic multi-layer sheet 1000 and are in contact with the soft tissue in the oral cavity, and may be made of a soft thermoplastic transparent polymer material. That is, the first outer layer 100 and the second outer layer 200 are made of a soft polymer material to give flexibility to the transparent orthodontic multi-layer sheet 1000, and when a deformation force is applied, complex stress acts to provide high correction It can provide holding force and elastic recovery force.
  • the intermediate layer 300 constitutes the inner layer of the transparent orthodontic multi-layer sheet 1000 and provides orthodontic force for tooth movement, and may be made of a rigid thermoplastic transparent polymer material. That is, the intermediate layer 300 is made of a hard polymer material to impart strength to the transparent orthodontic multilayer sheet 1000, and can provide an orthodontic force for applying a force in a direction in which the teeth want to move.
  • the first outer layer 100 and the second outer layer 200 may be made of a flexible thermoplastic polyurethane (TPU).
  • TPU thermoplastic polyurethane
  • Polyurethane has the characteristics of both rubber and plastic, and is a non-toxic material without harmful substances such as environmental hormones and TVOC. In addition, it is an elastic material that does not require a separate plasticizer and has the highest abrasion resistance among thermoplastic elastomers that can be plastically processed by heat.
  • the first outer layer 100 and the second outer layer 200 manufactured according to the present invention are made of a flexible polyurethane having a high strain recovery rate to give flexibility to the transparent orthodontic multi-layer sheet 1000, , it is possible to reduce the pain inflicted on the patient at the initial stage of orthodontic treatment.
  • the first outer layer 100 and the second outer layer 200 manufactured according to the present invention may be configured to have a thickness of 20 ⁇ m or more and 200 ⁇ m or less.
  • the thickness of the first outer layer 100 and the second outer layer 200 is less than 20 ⁇ m, the flexibility of the multi-layer sheet 1000 for transparent correction may be lowered because it cannot sufficiently receive elastic deformation, and the If the thickness of the first outer layer 100 and the second outer layer 200 exceeds 200 ⁇ m, the thickness of the transparent orthodontic multi-layer sheet 1000 may become too thick, and thus the patient's wearing comfort may be reduced.
  • the first outer layer 100 and the second outer layer 200 are preferably configured to have a hardness of 60A or more and 100A or less. If the hardness of the first outer layer 100 and the second outer layer 200 is less than 60A, there is a fear that sufficient strength for maintaining orthodontic force may not be provided when in contact with the teeth, and if it exceeds 100A, the strength of the outer layer is excessively increased Therefore, it may not provide sufficient elasticity, and the pain relief of the patient may be reduced.
  • the intermediate layer 300 may be made of rigid thermoplastic polyurethane (TPU).
  • transparent polymer materials such as PET, PE, and PC were used as materials for securing corrective power, that is, strength as materials for interlayer materials.
  • PET PET
  • PE PE
  • PC PC
  • the intermediate layer 300 manufactured according to the present invention is made of a hard polyurethane to improve durability by increasing interlayer bonding strength with the first outer layer 100 and the second outer layer 200.
  • Multi-layer sheet for transparent correction (1000) It is possible to impart rigidity and a high rate of deformation recovery to the tooth, thereby providing improved orthodontic force.
  • the intermediate layer 300 manufactured according to the present invention may be configured to have a thickness of 200 ⁇ m or more and 1500 ⁇ m or less. At this time, if the thickness of the intermediate layer 300 is less than 200 ⁇ m, it may be difficult to secure sufficient strength for maintaining the corrective force, and if the thickness of the intermediate layer 300 exceeds 1500 ⁇ m, the thickness of the transparent orthodontic multi-layer sheet 1000 is too thick. This may reduce the patient's wearing comfort.
  • the intermediate layer 300 is preferably configured to have a yield strength of 40 MPa or more and 60 MPa or less, and a Young's modulus of 1500 MPa or more and 2200 MPa or less. If the yield strength of the intermediate layer 300 is less than 40 MPa and the modulus of elasticity is less than 1500 MPa, it may not be possible to provide sufficient elastic deformation, so it may be difficult to provide sufficient mechanical strength for securing corrective force, the yield strength is more than 60 MPa and the modulus of elasticity is more than 2200 MPa It can be difficult to relieve pain in patients in the early stages of orthodontic treatment.
  • the intermediate layer 300 may be configured to have a transmittance of 93% or more and 97% or less.
  • the transparent orthodontic sheet 1000 manufactured according to the present invention is composed of multiple layers of soft polyurethane and rigid polyurethane having similar thermal properties, thereby increasing orthodontic retention, reducing patient pain, and providing excellent interlayer bonding strength. As a result, durability is improved and safety can be increased when worn by patients.
  • Figure 2 is a schematic diagram showing a method of manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention
  • Figure 3 is a flowchart showing a method for manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention am.
  • the present invention is a step of mounting the soft thermoplastic polymer material 100, 200 in a roll state to the upper roll 10 and the lower roll 20 of the laminator, respectively (S100), the upper roll (10) and raising the temperature of the lower roll 20 (S200), pressing the roll sheet of the soft thermoplastic polymer material 100, 200 mounted on the upper roll 10 and the lower roll 20 Lamination after bonding in the roll 30 (S300) and while the soft thermoplastic polymer materials 100 and 200 are being laminated, the rigid thermoplastic polymer material 300 is mounted on the center roll 40 of the laminator and lamination is in progress. It is possible to provide a method for manufacturing a multi-layer sheet for transparent correction comprising the step (S400) of manufacturing the multi-layer sheet 1000 by putting it in the compression roll 30 .
  • the method of manufacturing a multi-layer sheet for transparent correction of the present invention may be performed by a lamination process.
  • lamination refers to a technology that protects the surface and increases strength and stability by overlaying one or more thin layers on the target object.
  • the laminator used in the present invention is configured to include an upper roll 10 , a lower roll 20 , a pressing roll 30 and a center roll 40 .
  • the upper roll 10 and the lower roll 20 provide a soft thermoplastic polymer material in a roll state
  • the center roll 40 provides a hard thermoplastic polymer material in a roll state
  • the compression roll 30 provides the soft thermoplastic polymer material in a roll state. Compress the thermoplastic polymer material and the rigid thermoplastic polymer material to bond them together.
  • the soft thermoplastic polymer materials 100 and 200 in a roll state are mounted on the upper roll 10 and the lower roll 20 of the laminator, respectively ( S100).
  • the elevated temperature of the upper roll and the lower roll is characterized in that 110 to 140 °C.
  • the bonding strength between the soft thermoplastic polymer material and the hard thermoplastic polymer material may be reduced, and if it exceeds 140 °C, the soft The quality of the transparent orthodontic multi-layer sheet prepared by partially melting the thermoplastic polymer material or the rigid thermoplastic polymer material may deteriorate.
  • the soft thermoplastic polymer materials 100 and 200 in the form of a roll sheet mounted on the upper roll 10 and the lower roll 20 are laminated after bonding in the pressing roll 30 (S300).
  • the pressure of the compression roll 30 is characterized in that 0.2 to 1.0 KPa. If the pressure of the compression roll 30 is less than 0.2 KPa, sufficient compression between the soft thermoplastic polymer materials 100 and 200 and the hard thermoplastic polymer material 300 may not be made, so that the peel strength may decrease, and if it exceeds 1.0 KPa The thickness of the manufactured multi-layer sheet for transparent orthodontic treatment is too thin, so that a sufficient thickness cannot be secured when manufacturing a transparent orthodontic device, and product performance may be deteriorated.
  • the lamination speed of the pressing roll 30 is characterized in that 0.5 to 4.5 m / min. If the lamination speed is less than 0.5 m/min, the manufacturing efficiency may decrease when manufacturing the multi-layer sheet for transparent correction, and if it exceeds 4.5 m/min, sufficient compression time by the pressing roll 30 cannot be secured, resulting in a decrease in interlayer peel strength can be
  • the rigid thermoplastic polymer material 300 is mounted on the center roll 40 of the laminator and inserted into the pressing roll 30 in the process of lamination to insert a multi-layer sheet ( 1000) is prepared (S400).
  • thermoplastic polymer material As such, through the manufacturing method of the present invention, it is possible to manufacture a transparent orthodontic multilayer sheet with improved interlaminar peel strength while the soft thermoplastic polymer material and the rigid thermoplastic polymer material have an effective thickness for performance as a transparent orthodontic material.
  • the first outer layer 100 and the second outer layer 200 of the transparent orthodontic multi-layer sheet 1000 used in the experiment were made of soft polyurethane, and the middle layer 300 was made of rigid polyurethane. .
  • the outer layer of the conventional material is made of flexible polyurethane, and the inner layer is configured to be made of hard polyester.
  • the universal testing machine is an experimental instrument that applies stress to the material to find out the most basic mechanical properties of the polymer material, and then measures the resulting strain to find out the physical properties of the material.
  • There are various types of experiments such as tensile, peeling, and bending.
  • the LOAD value is measured until the specimen deforms with respect to that force. Since the detailed experimental method is a known fact, it will be omitted.
  • the conventional material was measured to have a yield strength of about 30 MPa to 40 MPa and an elastic modulus of 1500 MPa to 1700 MPa
  • the transparent orthodontic multilayer sheet 1000 prepared according to the present invention is about 40 MPa to 60 MPa It was measured to have a yield strength of 1200 MPa and an elastic modulus of 2000 MPa.
  • the transparent orthodontic multi-layer sheet 1000 of the present invention allows greater elastic deformation compared to conventional materials, thereby reducing pain applied to the patient at the initial stage of orthodontic treatment and improving safety when wearing the patient.
  • FIG. 5 is a graph comparing peel strength between a multi-layer sheet for transparent correction manufactured according to an embodiment of the present invention and a conventional material.
  • the multi-layer sheet 1000 for transparent calibration prepared according to the present invention and a specimen including a surface where the outer layer and the middle layer are not bonded to the conventional material were prepared, and the peel strength was measured with a universal tester.
  • the conventional material was measured to have a peel strength of about 0.1N/cm to 0.15N/cm
  • the transparent orthodontic multilayer sheet 1000 prepared according to the present invention was about 0.2N/cm It was measured to have more than peel strength.
  • the transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention has a peel strength of about 2 to 3 times that of a conventional material, thereby improving interlayer bonding strength, thereby preventing the occurrence of an interlayer peeling phenomenon. Accordingly, it is possible to prevent performance degradation due to the peeling phenomenon and the peeling layer being present in the patient's oral cavity or flowing into the digestive tract, thereby compromising the safety of the patient.
  • FIG. 6 is a photograph comparing the recovery rate after deformation between the multi-layer sheet for transparent correction prepared according to an embodiment of the present invention and a conventional material
  • FIG. 7 is a multi-layer for transparent correction prepared according to an embodiment of the present invention. It is a graph comparing the retention rate of orthodontic force between the sheet and the conventional material.
  • the multilayer sheet 1000 for transparent correction prepared according to the present invention and the conventional material were manufactured as a 1X8cm specimen, and the amount of change for 24 hours after bending was measured.
  • Figure 6 in the case of the conventional material, it can be seen that the recovery rate after deformation is relatively low because a relatively large angle is maintained for 24 hours after bending. ), it can be seen that the recovery rate after deformation is relatively large, as it was recovered almost similar to the initial state for 24 hours after bending.
  • the transparent orthodontic multi-layer sheet 1000 and the conventional material prepared according to the present invention were manufactured as a specimen for measuring flexural strength, and the orthodontic force retention rate was measured through the strain recovery rate using a universal testing machine.
  • the corrective force decreases relatively quickly with time, and the corrective force decreases significantly after a certain period of time, and in the case of the transparent orthodontic multilayer sheet 1000 of the present invention It can be seen that the corrective force decreases with time relatively slowly, so that the corrective force is maintained at a certain level even after a certain period of time.
  • the transparent orthodontic multilayer sheet 1000 manufactured according to the present invention has excellent orthodontic holding power due to less deformation at the tooth deformed position compared to the conventional material, and excellent interlayer bonding strength, so durability and safety when worn by a patient can be improved. have.

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
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  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

One embodiment of the present invention provides a method for manufacturing a multilayer sheet for transparent braces, comprising the steps of: (a) mounting a rolled soft thermoplastic polymer material on an upper roll and a lower roll of a laminator; (b) increasing the temperature of the upper roll and the lower roll; (c) bonding the roll sheet of the soft thermoplastic polymer material, which is mounted on the upper roll and the lower roll, on press rolls, and then laminating same; and (d) mounting a hard thermoplastic polymer material on a central roll of the laminator during lamination of the soft thermoplastic polymer material, so as to insert same between the press rolls performing lamination, and thus a multilayer sheet is manufactured.

Description

투명 교정용 다중층 시트 제조 방법Method of manufacturing multi-layer sheet for clear proofing
본 발명은 투명 교정용 다중층 시트 제조 방법에 관한 것으로, 더욱 상세하게는 치열 교정시술 시 필요한 투명 교정용 소재로서 다중층으로 구성되어 교정 유지력을 높이고 환자의 고통을 경감시키며, 우수한 층간 접합력과 내구성을 갖도록 구성되어 교정 장치의 안정성 및 환자 착용 시 안전성을 높일 수 있는 투명 교정용 다중층 시트 제조 방법에 관한 것이다.The present invention relates to a method for manufacturing a multi-layered sheet for transparent orthodontics, and more particularly, to a transparent orthodontic material necessary for orthodontic procedures. It relates to a method for manufacturing a transparent orthodontic multi-layer sheet that is configured to have a high stability of the orthodontic device and safety when worn by a patient.
교정 치료는 불규칙한 치아 배열이나 상하악의 비정상적인 맞물림 상태 등을 치료하기 위하여 가해지는 치료 행위이다. 일반적으로 교정 치료를 위하여 브라켓과 와이어를 이용하여 치료가 행해지게 되는데, 치아에 교정력을 가하기 위하여 금속으로 제작된 브라켓과 와이어를 사용한다. 이러한 금속 브라켓과 와이어의 경우 심미적으로 좋지 않으며, 치아에 고정하여 치료가 진행되기 때문에 구강 내 청결에 더욱 신경을 써야 한다는 단점이 있다.Orthodontic treatment is a therapeutic action applied to treat irregular tooth arrangement or abnormal interlocking of upper and lower jaws. In general, treatment is performed using brackets and wires for orthodontic treatment, and metal brackets and wires are used to apply orthodontic force to teeth. In the case of these metal brackets and wires, they are not aesthetically good, and since treatment is carried out by fixing them to the teeth, there is a disadvantage that more attention should be paid to the cleanliness of the oral cavity.
이러한 단점을 보안하기 위하여 최근 투명교정이라는 새로운 교정 치료 행위가 전세계적으로 많이 진행되고 있다. 이는 기존의 금속 재료가 아닌 고분자를 이용한 교정장치로서, 투명하여 심미적으로 우수한 장점을 가지고 있을 뿐만 아니라 탈부착이 가능해 구강 위생 관리에 어려움이 없다는 장점을 가지고 있다.In order to secure these shortcomings, a new orthodontic treatment called transparent orthodontic treatment has recently been progressing a lot around the world. This is an orthodontic appliance using a polymer instead of a conventional metal material. It has the advantage of being transparent and aesthetically excellent, as well as being detachable, so there is no difficulty in oral hygiene management.
투명교정장치는 고분자 시트를 진공 열성형을 통해 환자의 구강에 알맞게 성형하여 치료에 사용된다. 종래의 대부분 고분자 시트는 Polyethylene terephthalate glycol(PETG)로 구성되어 있다. PETG를 비롯한 종래의 고분자 시트로 제작된 투명교정장치는 장치 착용 초기에 환자에게 가해지는 고통이 크며 시간에 따라 치아에 가해지는 교정력이 하락하는 특징을 가지고 있다. 이는 환자에게 불편감과 통증을 유발하며 초기와 다르게 낮은 교정력을 치아에 부여해 예측한 결과와 일치하지 않은 치아 이동 결과를 초래하게 된다.The transparent orthodontic device is used for treatment by molding a polymer sheet to suit the patient's oral cavity through vacuum thermoforming. Most of the conventional polymer sheets are composed of polyethylene terephthalate glycol (PETG). Transparent orthodontic devices made of conventional polymer sheets, including PETG, have a characteristic that the pain applied to the patient at the initial stage of wearing the device is great, and the orthodontic force applied to the teeth decreases over time. This causes discomfort and pain to the patient, and gives the teeth a lower orthodontic force unlike the initial one, resulting in tooth movement that does not match the predicted results.
이를 개선하기 위한 다중층 시트(Polyester-TPU)가 개발되었으나 열적 특성 차이로 인해 층간 접합력이 약한 단점이 있다. 이로 인해 교정용 제품 적용시 층간 박리현상이 발생하여 성능 저하를 유발하고 벗겨진 층은 환자의 구강에 존재하거나 소화기로 유입되어 환자의 안전에 영향을 미친다. 따라서 층간 접합력 향상을 통해 교정장치의 장기적 안정성, 환자 장치 착용 시 안전성이 증대된 소재가 필요하다.A multi-layer sheet (Polyester-TPU) has been developed to improve this, but there is a disadvantage in that the interlayer bonding strength is weak due to the difference in thermal properties. Due to this, delamination occurs when applying orthodontic products, which causes performance degradation, and the peeled layer exists in the patient's mouth or enters the digestive tract, affecting patient safety. Therefore, there is a need for a material with increased long-term stability of the orthodontic device and safety when wearing the device by a patient through improved interlayer bonding.
또한 기존 다중층 시트는 강한 충격을 받을 시 중간층 고분자 소재의 백화현상을 동반한 영구변형이 발생하여 장치의 성능이 급격히 저하된다. 따라서 다중층 소재의 중간층 부분이 외력에 저항할 수 있는 높은 탄성 회복력을 갖도록 하여 장치의 내구성을 증가시키는 것이 필요하다.In addition, when the existing multi-layer sheet is subjected to a strong impact, permanent deformation accompanied by whitening of the intermediate layer polymer material occurs, and the performance of the device rapidly deteriorates. Therefore, it is necessary to increase the durability of the device by making the interlayer portion of the multi-layer material have a high elastic recovery force capable of resisting external forces.
선행기술문헌Prior art literature
미국 등록특허공보 제9655691 (2017.05.23)US Registered Patent Publication No. 9655691 (2017.05.23)
본 발명은 전술한 종래기술의 문제점을 해결하기 위한 것으로, 본 발명의 목적은 투명 교정용 다중층 시트 제조 방법에 관한 것으로, 더욱 상세하게는 치열 교정시술 시 필요한 투명 교정용 소재로서 다중층으로 구성되어 교정 유지력을 높이고 환자의 고통을 경감시키며, 우수한 층간 접합력과 내구성을 갖도록 구성되어 교정 장치의 안정성 및 환자 착용 시 안전성을 높일 수 있는 투명 교정용 다중층 시트 제조 방법을 제공하는 것이다.The present invention is to solve the problems of the prior art described above, and an object of the present invention relates to a method for manufacturing a multi-layered sheet for transparent orthodontics, and more particularly, it is a transparent orthodontic material necessary for orthodontic surgery and is composed of multiple layers. It is to provide a method for manufacturing a transparent orthodontic multi-layer sheet that can increase orthodontic retention, reduce patient pain, and increase stability of orthodontic devices and safety when worn by patients by having excellent interlayer bonding and durability.
상기와 같은 목적을 달성하기 위해, 본 발명의 일 측면은 (a) 롤 상태의 연질 열가소성 고분자 소재를 라미네이터의 상부 롤 및 하부 롤에 각각 장착하는 단계, (b) 상기 상부 롤 및 상기 하부 롤의 온도를 상승시키는 단계, (c) 상기 상부 롤 및 상기 하부 롤에 장착된 연질 열가소성 고분자 소재의 롤 시트를 압착 롤에서 접합한 후 라미네이션 하는 단계 및 (d) 상기 연질 열가소성 고분자 소재가 라미네이션 되는 동안 경질 열가소성 고분자 소재를 라미네이터의 중앙 롤에 장착하여 라미네이션 진행중인 상기 압착 롤에 끼워 넣어 다중층 시트를 제조하는 단계를 포함하는 투명 교정용 다중층 시트 제조 방법을 제공한다.In order to achieve the above object, one aspect of the present invention is a step of (a) mounting the soft thermoplastic polymer material in a roll state to the upper roll and the lower roll of the laminator, respectively, (b) the upper roll and the lower roll Raising the temperature, (c) laminating the roll sheets of the soft thermoplastic polymer material mounted on the upper roll and the lower roll in a pressing roll, and (d) laminating the soft thermoplastic polymer material while the soft thermoplastic polymer material is being laminated It provides a method of manufacturing a multi-layer sheet for transparent correction comprising the step of mounting a thermoplastic polymer material on a central roll of a laminator and inserting it into the pressing roll in progress of lamination to prepare a multi-layer sheet.
본 발명의 일 실시예에 있어서, 상기 (b) 단계에서, 상승된 상기 상부 롤 및 상기 하부 롤의 온도는 110 내지 140℃인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법일 수 있다.In one embodiment of the present invention, in the step (b), the elevated temperature of the upper roll and the lower roll may be a transparent correction multi-layer sheet manufacturing method, characterized in that 110 to 140 ℃.
본 발명의 일 실시예에 있어서, 상기 (c) 단계에서, 상기 압착 롤의 압력은 0.2 내지 1.0 KPa 인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법일 수 있다.In an embodiment of the present invention, in the step (c), the pressure of the pressing roll may be a method of manufacturing a multi-layer sheet for transparent correction, characterized in that 0.2 to 1.0 KPa.
본 발명의 일 실시예에 있어서, 상기 (c) 단계에서, 상기 압착 롤의 라미네이션 속도는 0.5 내지 4.5 m/min 인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법일 수 있다.In an embodiment of the present invention, in the step (c), the lamination speed of the pressing roll may be a method of manufacturing a multi-layered sheet for transparent correction, characterized in that 0.5 to 4.5 m/min.
본 발명의 일 실시예에 있어서, 상기 연질 열가소성 고분자 소재는 연질 폴리우레탄인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법일 수 있다.In one embodiment of the present invention, the flexible thermoplastic polymer material may be a transparent orthodontic multi-layer sheet manufacturing method, characterized in that the flexible polyurethane.
본 발명의 일 실시예에 있어서, 상기 경질 열가소성 고분자 소재는 경질 폴리우레탄인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법일 수 있다.In one embodiment of the present invention, the rigid thermoplastic polymer material may be a method for manufacturing a multi-layer sheet for transparent correction, characterized in that the rigid polyurethane.
본 발명의 일 실시예에 있어서, 상기 연질 열가소성 고분자 소재는 85 내지 95A의 경도(hardness)를 갖는 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법일 수 있다.In one embodiment of the present invention, the flexible thermoplastic polymer material may be a transparent orthodontic multi-layer sheet manufacturing method, characterized in that having a hardness (hardness) of 85 to 95A.
본 발명의 일 실시예에 있어서, 상기 경질 열가소성 고분자 소재는 40MPa 이상 60MPa 이하의 항복강도(Yield strength)를 갖고, 1500MPa 이상 2200MPa 이하의 탄성계수(Young's modulus)를 갖는 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법일 수 있다.In one embodiment of the present invention, the rigid thermoplastic polymer material has a yield strength of 40 MPa or more and 60 MPa or less, and has an elastic modulus (Young's modulus) of 1500 MPa or more and 2200 MPa or less. It may be a method of making a layer sheet.
본 발명의 일 측면에 따르면, 본 발명에 따라 제조된 투명 교정용 다중층 시트는 종래 소재 대비하여 치아 변형위치에서 장기간 변형이 적어 교정 유지력이 뛰어나고, 층간 접합력이 우수하여 내구성 및 환자 착용시 안전성이 향상될 수 있다.According to one aspect of the present invention, the transparent orthodontic multi-layer sheet manufactured according to the present invention has excellent orthodontic holding power due to less deformation at the tooth deformed position for a long period of time compared to conventional materials, and has excellent durability and safety when wearing the patient due to excellent interlayer bonding strength. can be improved
또한, 외부층이 연질 고분자 소재로 이루어져 유연성을 부여함에 따라 초기 교정시 환자의 고통을 경감시킬 수 있다.In addition, since the outer layer is made of a soft polymer material to give flexibility, it is possible to reduce the pain of the patient during the initial correction.
그리고, 중간층이 경질 고분자 소재로 이루어지고 높은 탄성 회복력을 가짐에 따라 외부층과의 층간 접합력 및 내구성이 향상될 수 있다.And, as the intermediate layer is made of a hard polymer material and has high elastic recovery force, interlayer bonding strength and durability with the outer layer may be improved.
본 발명의 효과는 상기한 효과로 한정되는 것은 아니며, 본 발명의 상세한 설명 또는 특허청구범위에 기재된 발명의 구성으로부터 추론 가능한 모든 효과를 포함하는 것으로 이해되어야 한다.It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.
도 1은 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트를 나타내는 사시도이다.1 is a perspective view showing a multi-layered sheet for transparent correction manufactured according to an embodiment of the present invention.
도 2는 본 발명의 일 실시예에 따른 투명 교정용 다중층 시트를 제조하는 방법을 나타내는 개략도이다.Figure 2 is a schematic diagram showing a method of manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention.
도 3은 본 발명의 일 실시예에 따른 투명 교정용 다중층 시트를 제조하는 방법을 나타내는 순서도이다.3 is a flowchart illustrating a method for manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention.
도 4의 (a) 및 (b)는 각각 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트, 중간층 및 종래 소재 간의 항복강도(Yield strength) 및 탄성계수(Young's modulus)를 비교한 그래프이다.4 (a) and (b) is a comparison of the yield strength (Yield strength) and elastic modulus (Young's modulus) between the transparent orthodontic multi-layer sheet, the intermediate layer, and the conventional material manufactured according to an embodiment of the present invention, respectively. It is a graph.
도 5는 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트와 종래 소재 간의 박리강도(Peel strength)를 비교한 그래프이다.5 is a graph comparing peel strength between a multi-layer sheet for transparent correction manufactured according to an embodiment of the present invention and a conventional material.
도 6은 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트와 종래 소재 간의 변형 후 회복율을 비교한 사진이다.6 is a photograph comparing the recovery rate after deformation between the multi-layer sheet for transparent correction prepared according to an embodiment of the present invention and a conventional material.
도 7은 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트와 종래 소재 간의 교정력 유지율을 비교한 그래프이다.7 is a graph comparing the retention rate of orthodontic force between the multi-layer sheet for transparent correction prepared according to an embodiment of the present invention and a conventional material.
이하에서는 첨부한 도면을 참조하여 본 발명을 설명하기로 한다. 그러나 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며, 따라서 여기에서 설명하는 실시예로 한정되는 것은 아니다. 그리고 도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 유사한 부분에 대해서는 유사한 도면 부호를 붙였다.Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in several different forms, and thus is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.
명세서 전체에서, 어떤 부분이 다른 부분과 "연결"되어 있다고 할 때, 이는 "직접적으로 연결"되어 있는 경우뿐 아니라, 그 중간에 다른 부재를 사이에 두고 "간접적으로 연결"되어 있는 경우도 포함한다. 또한 어떤 부분이 어떤 구성요소를 "포함"한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 구비할 수 있다는 것을 의미한다.Throughout the specification, when a part is said to be "connected" with another part, it includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" with another member interposed therebetween. . In addition, when a part "includes" a certain component, this means that other components may be further provided without excluding other components unless otherwise stated.
이하 첨부된 도면을 참고하여 본 발명의 실시예를 상세히 설명하기로 한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트를 나타내는 사시도이다.1 is a perspective view showing a multi-layered sheet for transparent correction manufactured according to an embodiment of the present invention.
도 1을 참조하면, 본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)는 제1 외부층(100), 제2 외부층(200) 및 중간층(300)을 포함하는 3중층 구조로 구성될 수 있다.Referring to FIG. 1 , the transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention has a triple-layer structure including a first outer layer 100 , a second outer layer 200 and an intermediate layer 300 . can be
본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)는 종래 단일층 소재 시트와는 달리 구강 내 연조직과 맞닿는 외부층과 강성을 부여하는 내부층의 소재를 다르게 구성함으로써 시간에 따라 치아에 가해지는 교정력을 유지하면서도 환자에게 가해지는 불편감과 통증을 감소시킬 수 있다.The transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention differs from the conventional single-layer material sheet by configuring the material of the outer layer in contact with the soft tissue in the oral cavity and the inner layer providing rigidity differently over time. It can reduce discomfort and pain inflicted to the patient while maintaining the corrective power.
이때, 제1 외부층(100) 및 제2 외부층(200)은 투명 교정용 다중층 시트(1000)의 바깥층을 구성하고 구강 내 연조직과 맞닿는 부분으로서, 연질 열가소성 투명 고분자 소재로 이루어질 수 있다. 즉, 제1 외부층(100) 및 제2 외부층(200)은 연질 고분자 소재로 이루어져 투명 교정용 다중층 시트(1000)에 유연성을 부여하며, 변형력이 가해졌을 시 복합 응력이 작용하여 높은 교정 유지력 및 탄성 회복력을 제공할 수 있다.In this case, the first outer layer 100 and the second outer layer 200 constitute the outer layer of the transparent orthodontic multi-layer sheet 1000 and are in contact with the soft tissue in the oral cavity, and may be made of a soft thermoplastic transparent polymer material. That is, the first outer layer 100 and the second outer layer 200 are made of a soft polymer material to give flexibility to the transparent orthodontic multi-layer sheet 1000, and when a deformation force is applied, complex stress acts to provide high correction It can provide holding force and elastic recovery force.
중간층(300)은 투명 교정용 다중층 시트(1000)의 내부층을 구성하고 치아 이동을 위한 교정력을 부여하는 부분으로서, 경질 열가소성 투명 고분자 소재로 이루어질 수 있다. 즉, 중간층(300)은 경질 고분자 소재로 이루어져 투명 교정용 다중층 시트(1000)에 강도를 부여하며, 치아가 이동하고자 하는 방향으로 힘을 가하는 교정력을 제공할 수 있다.The intermediate layer 300 constitutes the inner layer of the transparent orthodontic multi-layer sheet 1000 and provides orthodontic force for tooth movement, and may be made of a rigid thermoplastic transparent polymer material. That is, the intermediate layer 300 is made of a hard polymer material to impart strength to the transparent orthodontic multilayer sheet 1000, and can provide an orthodontic force for applying a force in a direction in which the teeth want to move.
일 실시예에 따르면, 제1 외부층(100) 및 제2 외부층(200)은 연질 열가소성 폴리우레탄(Thermoplastic Poly Urethane, TPU)으로 이루어질 수 있다.According to an embodiment, the first outer layer 100 and the second outer layer 200 may be made of a flexible thermoplastic polyurethane (TPU).
폴리우레탄은 고무와 플라스틱의 특징을 모두 가지고 있으며, 환경호르몬, TVOC등의 유해물질이 없는 무독성 소재이다. 또한, 별도의 가소재가 필요 없는 탄성체로, 열에 의한 소성가공이 가능한 열가소성 엘라스토머 중 내마모성이 가장 높은 성질을 갖는 소재이다.Polyurethane has the characteristics of both rubber and plastic, and is a non-toxic material without harmful substances such as environmental hormones and TVOC. In addition, it is an elastic material that does not require a separate plasticizer and has the highest abrasion resistance among thermoplastic elastomers that can be plastically processed by heat.
이에 따라, 본 발명에 따라 제조된 제1 외부층(100) 및 제2 외부층(200)은 변형 회복률이 높은 연질 폴리우레탄으로 이루어져 투명 교정용 다중층 시트(1000)에 유연성을 부여할 수 있으며, 이에 따라 교정 초기 환자에게 가해지는 고통을 경감시킬 수 있게 된다.Accordingly, the first outer layer 100 and the second outer layer 200 manufactured according to the present invention are made of a flexible polyurethane having a high strain recovery rate to give flexibility to the transparent orthodontic multi-layer sheet 1000, , it is possible to reduce the pain inflicted on the patient at the initial stage of orthodontic treatment.
한편, 본 발명에 따라 제조된 제1 외부층(100) 및 제2 외부층(200)은 20μm 이상 200μm 이하의 두께를 갖도록 구성될 수 있다. 이때, 상기 제1 외부층(100) 및 제2 외부층(200)의 두께가 20μm 미만이면 탄성 변형을 충분히 받아주지 못해 투명 교정용 다중층 시트(1000)의 유연성이 저하될 수 있으며, 상기 제1 외부층(100) 및 제2 외부층(200)의 두께가 200μm 초과면 투명 교정용 다중층 시트(1000)의 두께가 지나치게 두꺼워져 환자의 착용감이 저하될 수 있다.Meanwhile, the first outer layer 100 and the second outer layer 200 manufactured according to the present invention may be configured to have a thickness of 20 μm or more and 200 μm or less. At this time, if the thickness of the first outer layer 100 and the second outer layer 200 is less than 20 μm, the flexibility of the multi-layer sheet 1000 for transparent correction may be lowered because it cannot sufficiently receive elastic deformation, and the If the thickness of the first outer layer 100 and the second outer layer 200 exceeds 200 μm, the thickness of the transparent orthodontic multi-layer sheet 1000 may become too thick, and thus the patient's wearing comfort may be reduced.
이때, 제1 외부층(100) 및 제2 외부층(200)는 60A 이상 100A이하의 경도(hardness)를 갖도록 구성되는 것이 바람직하다. 제1 외부층(100) 및 제2 외부층(200)의 경도가 60A 미만이면 치아와 맞닿을 시 교정력 유지를 위한 충분한 강도를 제공하지 못할 우려가 있으며, 100A 초과면 외부층의 강도가 지나치게 증가하여 충분한 탄성을 제공하지 못해 환자의 고통 경감이 저하될 수 있다.In this case, the first outer layer 100 and the second outer layer 200 are preferably configured to have a hardness of 60A or more and 100A or less. If the hardness of the first outer layer 100 and the second outer layer 200 is less than 60A, there is a fear that sufficient strength for maintaining orthodontic force may not be provided when in contact with the teeth, and if it exceeds 100A, the strength of the outer layer is excessively increased Therefore, it may not provide sufficient elasticity, and the pain relief of the patient may be reduced.
일 실시예에 따르면, 중간층(300)은 경질 열가소성 폴리우레탄(Thermoplastic Poly Urethane, TPU)으로 이루어질 수 있다.According to an embodiment, the intermediate layer 300 may be made of rigid thermoplastic polyurethane (TPU).
종래의 다중층 소재 중 중간층 소재는 교정력, 즉 강도 확보용 소재로서 PET, PE, PC 등의 투명 고분자 소재가 사용되었으나, 이러한 소재들은 공통적으로 변형에 대한 회복률이 낮으며, 층간 접합력이 낮은 특징을 가지고 있다. Among the conventional multi-layer materials, transparent polymer materials such as PET, PE, and PC were used as materials for securing corrective power, that is, strength as materials for interlayer materials. Have.
또한, 종래의 다중층 시트는 강한 충격을 받는 경우, 중간층 고분자 소재의 백화현상을 동반한 영구변형이 발생하여 성능이 급격히 저하되는 문제가 있다. 즉 다중층 소재의 중간층은 교정력을 확보할 수 있는 강도를 가지면서 외력에 저항할 수 있는 높은 탄성 회복력을 갖도록 하여 다중층 소재의 내구성을 증가시키는 것이 요구된다.In addition, when the conventional multi-layer sheet is subjected to a strong impact, there is a problem in that the performance of the interlayer polymer material is rapidly deteriorated due to permanent deformation accompanied by whitening of the intermediate layer polymer material. That is, it is required to increase the durability of the multi-layer material by allowing the intermediate layer of the multi-layer material to have a high elastic recovery force capable of resisting an external force while having the strength to secure the corrective force.
본 발명에 따라 제조된 중간층(300)은 제1 외부층(100) 및 제2 외부층(200)과의 층간 접합력을 높여 내구성을 향상시키는 경질 폴리우레탄으로 이루어져 투명 교정용 다중층 시트(1000)에 강성 및 높은 변형 회복률을 부여할 수 있으며, 이에 따라 향상된 치아 교정력을 제공할 수 있게 된다.The intermediate layer 300 manufactured according to the present invention is made of a hard polyurethane to improve durability by increasing interlayer bonding strength with the first outer layer 100 and the second outer layer 200. Multi-layer sheet for transparent correction (1000) It is possible to impart rigidity and a high rate of deformation recovery to the tooth, thereby providing improved orthodontic force.
한편, 본 발명에 따라 제조된 중간층(300)은 200μm 이상 1500μm 이하의 두께를 갖도록 구성될 수 있다. 이때, 상기 중간층(300)의 두께가 200μm 미만이면 교정력 유지를 위한 충분한 강도 확보가 어려울 수 있으며, 상기 중간층(300)의 두께가 1500μm 초과면 투명 교정용 다중층 시트(1000)의 두께가 지나치게 두꺼워져 환자의 착용감이 저하될 수 있다.Meanwhile, the intermediate layer 300 manufactured according to the present invention may be configured to have a thickness of 200 μm or more and 1500 μm or less. At this time, if the thickness of the intermediate layer 300 is less than 200 μm, it may be difficult to secure sufficient strength for maintaining the corrective force, and if the thickness of the intermediate layer 300 exceeds 1500 μm, the thickness of the transparent orthodontic multi-layer sheet 1000 is too thick. This may reduce the patient's wearing comfort.
이때, 중간층(300)은 40MPa 이상 60MPa 이하의 항복강도(Yield strength)를 갖고, 1500MPa 이상 2200MPa 이하의 탄성계수(Young's modulus)를 갖도록 구성되는 것이 바람직하다. 중간층(300)의 항복강도가 40MPa 미만이고 탄성계수가 1500MPa 미만이면 충분한 탄성 변형을 제공하지 못해 교정력 확보를 위한 충분한 기계적 강도를 제공하는 것이 어려울 수 있으며, 항복강도가 60MPa 초과이고 탄성계수가 2200MPa초과면 교정 초기 환자의 고통 경감이 어려울 수 있다.In this case, the intermediate layer 300 is preferably configured to have a yield strength of 40 MPa or more and 60 MPa or less, and a Young's modulus of 1500 MPa or more and 2200 MPa or less. If the yield strength of the intermediate layer 300 is less than 40 MPa and the modulus of elasticity is less than 1500 MPa, it may not be possible to provide sufficient elastic deformation, so it may be difficult to provide sufficient mechanical strength for securing corrective force, the yield strength is more than 60 MPa and the modulus of elasticity is more than 2200 MPa It can be difficult to relieve pain in patients in the early stages of orthodontic treatment.
또한, 중간층(300)는 93% 이상 97% 이하의 투과도(Transmittance)를 갖도록 구성될 수 있다.In addition, the intermediate layer 300 may be configured to have a transmittance of 93% or more and 97% or less.
이처럼, 본 발명에 따라 제조된 투명 교정용 시트(1000)는 열적 특성이 비슷한 연질 폴리우레탄과 경질 폴리우레탄의 다중층으로 구성됨에 따라 치아 교정 유지력을 높이고 환자의 고통을 경감시키며, 우수한 층간 접합력으로 인해 내구성이 향상되어 환자 착용 시 안전성을 높일 수 있다.As such, the transparent orthodontic sheet 1000 manufactured according to the present invention is composed of multiple layers of soft polyurethane and rigid polyurethane having similar thermal properties, thereby increasing orthodontic retention, reducing patient pain, and providing excellent interlayer bonding strength. As a result, durability is improved and safety can be increased when worn by patients.
도 2는 본 발명의 일 실시예에 따른 투명 교정용 다중층 시트를 제조하는 방법을 나타내는 개략도이고, 도 3은 본 발명의 일 실시예에 따른 투명 교정용 다중층 시트를 제조하는 방법을 나타내는 순서도이다.Figure 2 is a schematic diagram showing a method of manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention, Figure 3 is a flowchart showing a method for manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention am.
도 2 및 도 3을 참조하면, 본 발명은 롤 상태의 연질 열가소성 고분자 소재(100, 200)를 라미네이터의 상부 롤(10) 및 하부 롤(20)에 각각 장착하는 단계(S100), 상기 상부 롤(10) 및 상기 하부 롤(20)의 온도를 상승시키는 단계(S200), 상기 상부 롤(10) 및 상기 하부 롤(20)에 장착된 연질 열가소성 고분자 소재(100, 200)의 롤 시트를 압착 롤(30)에서 접합한 후 라미네이션 하는 단계(S300) 및 상기 연질 열가소성 고분자 소재(100, 200)가 라미네이션 되는 동안 경질 열가소성 고분자 소재(300)를 라미네이터의 중앙 롤(40)에 장착하여 라미네이션 진행중인 상기 압착 롤(30)에 끼워 넣어 다중층 시트(1000)를 제조하는 단계(S400)를 포함하는 투명 교정용 다중층 시트 제조 방법을 제공할 수 있다.2 and 3, the present invention is a step of mounting the soft thermoplastic polymer material 100, 200 in a roll state to the upper roll 10 and the lower roll 20 of the laminator, respectively (S100), the upper roll (10) and raising the temperature of the lower roll 20 (S200), pressing the roll sheet of the soft thermoplastic polymer material 100, 200 mounted on the upper roll 10 and the lower roll 20 Lamination after bonding in the roll 30 (S300) and while the soft thermoplastic polymer materials 100 and 200 are being laminated, the rigid thermoplastic polymer material 300 is mounted on the center roll 40 of the laminator and lamination is in progress. It is possible to provide a method for manufacturing a multi-layer sheet for transparent correction comprising the step (S400) of manufacturing the multi-layer sheet 1000 by putting it in the compression roll 30 .
본 발명의 투명 교정용 다중층 시트 제조 방법은 라미네이션 공정에 의해 수행될 수 있다. 이때, 라미네이션이란, 대상이 되는 물체에 1겹 이상의 얇은 레이어를 덧씌워 표면을 보호하고 강도와 안정성을 높이는 기술을 의미한다.The method of manufacturing a multi-layer sheet for transparent correction of the present invention may be performed by a lamination process. In this case, lamination refers to a technology that protects the surface and increases strength and stability by overlaying one or more thin layers on the target object.
본 발명에 사용되는 라미네이터는 상부 롤(10), 하부 롤(20), 압착 롤(30) 및 중앙 롤(40)을 포함하여 구성된다. 이때, 상부 롤(10) 및 하부 롤(20)은 롤 상태의 연질 열가소성 고분자 소재를 제공하고, 중앙 롤(40)은 롤상태의 경질 열가소성 고분자 소재를 제공하며, 압착 롤(30)은 상기 연질 열가소성 고분자 소재와 경질 열가소성 고분자 소재를 압착하여 접합시킨다.The laminator used in the present invention is configured to include an upper roll 10 , a lower roll 20 , a pressing roll 30 and a center roll 40 . At this time, the upper roll 10 and the lower roll 20 provide a soft thermoplastic polymer material in a roll state, the center roll 40 provides a hard thermoplastic polymer material in a roll state, and the compression roll 30 provides the soft thermoplastic polymer material in a roll state. Compress the thermoplastic polymer material and the rigid thermoplastic polymer material to bond them together.
이하, 본 발명의 투명 교정용 다중층 시트 제조 방법을 설명하면, 먼저, 롤 상태의 연질 열가소성 고분자 소재(100, 200)를 라미네이터의 상부 롤(10) 및 하부 롤(20)에 각각 장착시킨다(S100).Hereinafter, when explaining the method for manufacturing the multi-layer sheet for transparent correction of the present invention, first, the soft thermoplastic polymer materials 100 and 200 in a roll state are mounted on the upper roll 10 and the lower roll 20 of the laminator, respectively ( S100).
그 다음, 상기 상부 롤(10) 및 상기 하부 롤(20)의 온도를 상승시킨다(S200). Then, the temperature of the upper roll 10 and the lower roll 20 is increased (S200).
이때, 일 실시예에 따르면, 상승된 상기 상부 롤 및 상기 하부 롤의 온도는 110 내지 140℃인 것을 특징으로 한다. 라미네이션 공정 시, 상기 상부 롤(10) 및 상기 하부 롤(20)의 온도가 110℃ 미만이면 상기 연질 열가소성 고분자 소재와 상기 경질 열가소성 고분자 소재 사이의 접합력이 저하될 수 있으며, 140℃ 초과면 상기 연질 열가소성 고분자 소재 또는 상기 경질 열가소성 고분자 소재가 부분적으로 용융되어 제조된 투명 교정용 다중층 시트의 품질이 저하될 수 있다.At this time, according to one embodiment, the elevated temperature of the upper roll and the lower roll is characterized in that 110 to 140 ℃. During the lamination process, if the temperature of the upper roll 10 and the lower roll 20 is less than 110 ℃, the bonding strength between the soft thermoplastic polymer material and the hard thermoplastic polymer material may be reduced, and if it exceeds 140 ℃, the soft The quality of the transparent orthodontic multi-layer sheet prepared by partially melting the thermoplastic polymer material or the rigid thermoplastic polymer material may deteriorate.
그 다음, 상기 상부 롤(10) 및 상기 하부 롤(20)에 장착된 롤 시트 형태의 연질 열가소성 고분자 소재(100, 200)를 압착 롤(30)에서 접합한 후 라미네이션 한다(S300). Next, the soft thermoplastic polymer materials 100 and 200 in the form of a roll sheet mounted on the upper roll 10 and the lower roll 20 are laminated after bonding in the pressing roll 30 (S300).
이때, 일 실시예에 따르면, 상기 압착 롤(30)의 압력은 0.2 내지 1.0 KPa 인 것을 특징으로 한다. 상기 압착 롤(30)의 압력이 0.2 KPa 미만이면 연질 열가소성 고분자 소재(100, 200)와 경질 열가소성 고분자 소재(300) 사이의 충분한 압착이 이루어지지 않아 박리강도가 저하될 수 있으며, 1.0KPa 초과면 제조된 투명 교정용 다중층 시트의 두께가 지나치게 얇아져 투명교정장치 제작시 충분한 두께를 확보하지 못해 제품 성능이 저하될 수 있다.At this time, according to one embodiment, the pressure of the compression roll 30 is characterized in that 0.2 to 1.0 KPa. If the pressure of the compression roll 30 is less than 0.2 KPa, sufficient compression between the soft thermoplastic polymer materials 100 and 200 and the hard thermoplastic polymer material 300 may not be made, so that the peel strength may decrease, and if it exceeds 1.0 KPa The thickness of the manufactured multi-layer sheet for transparent orthodontic treatment is too thin, so that a sufficient thickness cannot be secured when manufacturing a transparent orthodontic device, and product performance may be deteriorated.
또한, 일 실시예에 따르면, 상기 압착 롤(30)의 라미네이션 속도는 0.5 내지 4.5m/min 인 것을 특징으로 한다. 라미네이션 속도가 0.5m/min 미만이면 투명 교정용 다중층 시트 제조 시 제조 효율이 저하될 수 있으며, 4.5m/min 초과면 압착 롤(30)에 의한 충분한 압착 시간을 확보하지 못해 층간 박리강도가 저하될 수 있다. In addition, according to one embodiment, the lamination speed of the pressing roll 30 is characterized in that 0.5 to 4.5 m / min. If the lamination speed is less than 0.5 m/min, the manufacturing efficiency may decrease when manufacturing the multi-layer sheet for transparent correction, and if it exceeds 4.5 m/min, sufficient compression time by the pressing roll 30 cannot be secured, resulting in a decrease in interlayer peel strength can be
마지막으로, 상기 연질 열가소성 고분자 소재(100, 200)가 라미네이션 되는 동안 경질 열가소성 고분자 소재(300)를 라미네이터의 중앙 롤(40)에 장착하여 라미네이션 진행중인 상기 압착 롤(30)에 끼워 넣어 다중층 시트(1000)를 제조한다(S400).Finally, while the soft thermoplastic polymer material 100, 200 is being laminated, the rigid thermoplastic polymer material 300 is mounted on the center roll 40 of the laminator and inserted into the pressing roll 30 in the process of lamination to insert a multi-layer sheet ( 1000) is prepared (S400).
이처럼, 본 발명의 제조 방법을 통해 연질 열가소성 고분자 소재와 경질 열가소성 고분자 소재가 투명 교정용 소재로서 성능 발휘를 위한 유효한 두께를 갖으면서도 층간 박리 강도가 향상된 투명 교정용 다중층 시트를 제조할 수 있다.As such, through the manufacturing method of the present invention, it is possible to manufacture a transparent orthodontic multilayer sheet with improved interlaminar peel strength while the soft thermoplastic polymer material and the rigid thermoplastic polymer material have an effective thickness for performance as a transparent orthodontic material.
이하에서는, 본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)와 종래 소재 간의 기계적 물성 값을 비교하는 실험 내용을 설명하며, 각각의 기계적 물성 값은 만능시험기(Universal Testing Machine, UTM)를 통해 측정되었다.Hereinafter, the experimental contents for comparing the mechanical property values between the transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention and the conventional material will be described, and each mechanical property value is a universal testing machine (UTM). was measured through
실험에 사용된 투명 교정용 다중층 시트(1000)의 제1 외부층(100) 및 제2 외부층(200)은 연질 폴리우레탄으로 이루어지고, 중간층(300)은 경질 폴리우레탄으로 이루어지도록 구성되었다. 그리고, 종래 소재의 바깥층은 연질 폴리우레탄으로 이루어지고, 내부층은 경질 폴리에스테르로 이루어지도록 구성되었다.The first outer layer 100 and the second outer layer 200 of the transparent orthodontic multi-layer sheet 1000 used in the experiment were made of soft polyurethane, and the middle layer 300 was made of rigid polyurethane. . And, the outer layer of the conventional material is made of flexible polyurethane, and the inner layer is configured to be made of hard polyester.
이때, 만능시험기(UTM)는 고분자 재료의 가장 기본적인 기계적인 특성을 알아내기 위해 재료에 응력을 가한 뒤, 이에 따른 변형율을 측정하여 재료의 물적 특성을 알아내는 실험 기구이다. 실험의 종류에는 인장, 박리, 굽힘 등의 실험이 있는데 모두 각 시편에 대한 힘을 가해주었을 때 그 힘에 대해 시편이 변형을 일으킬 때까지의 LOAD값을 측정하는 방식으로 진행되었다. 자세한 실험 방법은 공지의 사실이므로 생략하기로 한다. In this case, the universal testing machine (UTM) is an experimental instrument that applies stress to the material to find out the most basic mechanical properties of the polymer material, and then measures the resulting strain to find out the physical properties of the material. There are various types of experiments such as tensile, peeling, and bending. When a force is applied to each specimen, the LOAD value is measured until the specimen deforms with respect to that force. Since the detailed experimental method is a known fact, it will be omitted.
도 4의 (a) 및 (b)는 각각 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트, 중간층 및 종래 소재 간의 항복강도(Yield strength) 및 탄성계수(Young's modulus)를 비교한 그래프이다.4 (a) and (b) is a comparison of the yield strength (Yield strength) and elastic modulus (Young's modulus) between the transparent orthodontic multi-layer sheet, the intermediate layer, and the conventional material manufactured according to an embodiment of the present invention, respectively. It is a graph.
도 4를 참조하면, 종래 소재는 대략 30MPa 내지 40MPa의 항복강도와 1500 MPa 내지 1700MPa의 탄성계수를 갖는 것으로 측정되었으며, 본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)는 대략 40MPa 내지 60MPa의 항복강도와 1200MPa 내지 2000MPa의 탄성계수를 갖는 것으로 측정되었다.4, the conventional material was measured to have a yield strength of about 30 MPa to 40 MPa and an elastic modulus of 1500 MPa to 1700 MPa, and the transparent orthodontic multilayer sheet 1000 prepared according to the present invention is about 40 MPa to 60 MPa It was measured to have a yield strength of 1200 MPa and an elastic modulus of 2000 MPa.
즉, 본 발명의 투명 교정용 다중층 시트(1000)는 종래 소재에 비해 더 큰 탄성 변형을 허용함으로써 교정 초기 환자에게 가해지는 고통을 경감시키고 환자 착용시 안전성을 향상시킬 수 있다.That is, the transparent orthodontic multi-layer sheet 1000 of the present invention allows greater elastic deformation compared to conventional materials, thereby reducing pain applied to the patient at the initial stage of orthodontic treatment and improving safety when wearing the patient.
도 5는 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트와 종래 소재 간의 박리강도(Peel strength)를 비교한 그래프이다.5 is a graph comparing peel strength between a multi-layer sheet for transparent correction manufactured according to an embodiment of the present invention and a conventional material.
도 5를 참조하면, 본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)와 종래 소재를 외부층과 중간층이 접합되지 않은 면을 포함하는 시편을 제작하여 만능시험기로 박리강도를 측정하였다. 도 4에 나타난 바와 같이, 종래 소재는 대략 0.1N/cm 내지 0.15N/cm의 박리강도를 갖는 것으로 측정되었으며, 본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)는 대략 0.2N/cm 이상의 박리강도를 갖는 것으로 측정되었다.Referring to FIG. 5 , the multi-layer sheet 1000 for transparent calibration prepared according to the present invention and a specimen including a surface where the outer layer and the middle layer are not bonded to the conventional material were prepared, and the peel strength was measured with a universal tester. As shown in FIG. 4, the conventional material was measured to have a peel strength of about 0.1N/cm to 0.15N/cm, and the transparent orthodontic multilayer sheet 1000 prepared according to the present invention was about 0.2N/cm It was measured to have more than peel strength.
즉, 본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)는 종래 소재에 비해 대략 2배 내지 3배 정도의 박리강도를 갖음으로써 층간 접합력을 향상시켜 층간 박리현상 발생을 방지할 수 있다. 이에 따라, 박리현상으로 인한 성능 저하 및 벗겨진 층이 환자의 구강에 존재하거나 소화기로 유입되어 환자의 안전을 저해하는 것을 방지할 수 있다.That is, the transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention has a peel strength of about 2 to 3 times that of a conventional material, thereby improving interlayer bonding strength, thereby preventing the occurrence of an interlayer peeling phenomenon. Accordingly, it is possible to prevent performance degradation due to the peeling phenomenon and the peeling layer being present in the patient's oral cavity or flowing into the digestive tract, thereby compromising the safety of the patient.
도 6은 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트와 종래 소재 간의 변형 후 회복율을 비교한 사진이고, 도 7은 본 발명의 일 실시예에 따라 제조된 투명 교정용 다중층 시트와 종래 소재 간의 교정력 유지율을 비교한 그래프이다.6 is a photograph comparing the recovery rate after deformation between the multi-layer sheet for transparent correction prepared according to an embodiment of the present invention and a conventional material, and FIG. 7 is a multi-layer for transparent correction prepared according to an embodiment of the present invention. It is a graph comparing the retention rate of orthodontic force between the sheet and the conventional material.
도 6을 참조하면, 본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)와 종래 소재를 1X8cm 시편으로 제작하여 굽힘 후 24시간 동안의 변화량을 측정하였다. 도 6에 나타난 바와 같이, 종래 소재의 경우 굽힘 후 24시간 동안 상대적으로 큰 각도를 유지하고 있어 변형 후 회복율이 상대적으로 낮은 것을 확인할 수 있으며, 본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)의 경우 굽힘 후 24시간 동안 거의 초기 상태와 비슷하게 회복된 것으로 보아 변형 후 회복율이 상대적으로 큰 것을 확인할 수 있다.Referring to FIG. 6 , the multilayer sheet 1000 for transparent correction prepared according to the present invention and the conventional material were manufactured as a 1X8cm specimen, and the amount of change for 24 hours after bending was measured. As shown in Figure 6, in the case of the conventional material, it can be seen that the recovery rate after deformation is relatively low because a relatively large angle is maintained for 24 hours after bending. ), it can be seen that the recovery rate after deformation is relatively large, as it was recovered almost similar to the initial state for 24 hours after bending.
도 7을 참조하면, 본 발명에 따라 제조된 투명 교정용 다중층 시트(1000)와 종래 소재를 굴곡강도(flexural) 측정용 시편으로 제작하여 만능시험기를 이용한 변형 회복율을 통해 교정력 유지율을 측정하였다. 도 7에 나타난 바와 같이, 종래 소재의 경우 시간에 따른 교정력이 상대적으로 빠르게 감소하여 일정 시간이 지나고 나면 교정력이 현저히 낮아지는 것을 확인할 수 있으며, 본 발명의 투명 교정용 다중층 시트(1000)의 경우 시간에 따른 교정력이 상대적으로 느리게 감소하여 일정 시간이 지나더라도 교정력이 일정 수준 유지되는 것을 확인할 수 있다.Referring to Figure 7, the transparent orthodontic multi-layer sheet 1000 and the conventional material prepared according to the present invention were manufactured as a specimen for measuring flexural strength, and the orthodontic force retention rate was measured through the strain recovery rate using a universal testing machine. As shown in FIG. 7 , in the case of a conventional material, it can be seen that the corrective force decreases relatively quickly with time, and the corrective force decreases significantly after a certain period of time, and in the case of the transparent orthodontic multilayer sheet 1000 of the present invention It can be seen that the corrective force decreases with time relatively slowly, so that the corrective force is maintained at a certain level even after a certain period of time.
이처럼, 본 발명에 따른 제조된 투명 교정용 다중층 시트(1000)는 종래 소재 대비하여 치아 변형위치에서 장기간 변형이 적어 교정 유지력이 뛰어나고, 층간 접합력이 우수하여 내구성 및 환자 착용시 안전성이 향상될 수 있다.As such, the transparent orthodontic multilayer sheet 1000 manufactured according to the present invention has excellent orthodontic holding power due to less deformation at the tooth deformed position compared to the conventional material, and excellent interlayer bonding strength, so durability and safety when worn by a patient can be improved. have.
전술한 본 발명의 설명은 예시를 위한 것이며, 본 발명이 속하는 기술분야의 통상의 지식을 가진 자는 본 발명의 기술적 사상이나 필수적인 특징을 변경하지 않고서 다른 구체적인 형태로 쉽게 변형이 가능하다는 것을 이해할 수 있을 것이다. 그러므로 이상에서 기술한 실시예들은 모든 면에서 예시적인 것이며 한정적이 아닌 것으로 이해해야만 한다. 예를 들어, 단일형으로 설명되어 있는 각 구성 요소는 분산되어 실시될 수도 있으며, 마찬가지로 분산된 것으로 설명되어 있는 구성 요소들도 결합된 형태로 실시될 수 있다.The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.
본 발명의 범위는 후술하는 특허청구범위에 의하여 나타내어지며, 특허청구범위의 의미 및 범위 그리고 그 균등 개념으로부터 도출되는 모든 변경 또는 변형된 형태가 본 발명의 범위에 포함되는 것으로 해석되어야 한다.The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.
부호의 설명Explanation of symbols
1000 투명 교정용 다중층 시트1000 clear proofing multilayer sheet
100 제1 외부층 100 first outer layer
200 제2 외부층200 second outer layer
300 중간층300 mezzanine
10 상부 롤10 upper roll
20 하루 롤20 rolls per day
30 압착 롤30 crimp rolls
40 중앙 롤40 center roll

Claims (8)

  1. (a) 롤 상태의 연질 열가소성 고분자 소재를 라미네이터의 상부 롤 및 하부 롤에 각각 장착하는 단계;(a) mounting the soft thermoplastic polymer material in a roll state to the upper roll and the lower roll of the laminator, respectively;
    (b) 상기 상부 롤 및 상기 하부 롤의 온도를 상승시키는 단계;(b) raising the temperature of the upper roll and the lower roll;
    (c) 상기 상부 롤 및 상기 하부 롤에 장착된 연질 열가소성 고분자 소재의 롤 시트를 압착 롤에서 접합한 후 라미네이션 하는 단계; 및(c) laminating after bonding the roll sheets of the soft thermoplastic polymer material mounted on the upper roll and the lower roll in a pressing roll; and
    (d) 상기 연질 열가소성 고분자 소재가 라미네이션 되는 동안 경질 열가소성 고분자 소재를 라미네이터의 중앙 롤에 장착하여 라미네이션 진행중인 상기 압착 롤에 끼워 넣어 다중층 시트를 제조하는 단계를 포함하는 투명 교정용 다중층 시트 제조 방법.(d) while the soft thermoplastic polymer material is being laminated, the hard thermoplastic polymer material is mounted on the central roll of the laminator and inserted into the pressing roll in the process of lamination to prepare a multi-layer sheet manufacturing method .
  2. 제1항에 있어서,According to claim 1,
    상기 (b) 단계에서, 상승된 상기 상부 롤 및 상기 하부 롤의 온도는 110 내지 140℃인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법.In the step (b), the temperature of the raised upper roll and the lower roll is 110 to 140 ℃ transparent correction multi-layer sheet manufacturing method, characterized in that.
  3. 제1항에 있어서,According to claim 1,
    상기 (c) 단계에서, 상기 압착 롤의 압력은 0.2 내지 1.0 KPa 인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법.In the step (c), the pressure of the pressing roll is a transparent correction multi-layer sheet manufacturing method, characterized in that 0.2 to 1.0 KPa.
  4. 제1항에 있어서,According to claim 1,
    상기 (c) 단계에서, 상기 압착 롤의 라미네이션 속도는 0.5 내지 4.5 m/min 인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법.In the step (c), the lamination speed of the pressing roll is a transparent correction multi-layer sheet manufacturing method, characterized in that 0.5 to 4.5 m / min.
  5. 제1항에 있어서,According to claim 1,
    상기 연질 열가소성 고분자 소재는 연질 폴리우레탄인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법.The flexible thermoplastic polymer material is a transparent orthodontic multi-layer sheet manufacturing method, characterized in that the flexible polyurethane.
  6. 제1항에 있어서,According to claim 1,
    상기 경질 열가소성 고분자 소재는 경질 폴리우레탄인 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법.The method of manufacturing a transparent orthodontic multi-layer sheet, characterized in that the rigid thermoplastic polymer material is rigid polyurethane.
  7. 제1항에 있어서,According to claim 1,
    상기 연질 열가소성 고분자 소재는 85 내지 95A의 경도(hardness)를 갖는 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법.The flexible thermoplastic polymer material is a transparent orthodontic multi-layer sheet manufacturing method, characterized in that it has a hardness (hardness) of 85 to 95A.
  8. 제1항에 있어서,According to claim 1,
    상기 경질 열가소성 고분자 소재는 40MPa 이상 60MPa 이하의 항복강도(Yield strength)를 갖고, 1500MPa 이상 2200MPa 이하의 탄성계수(Young's modulus)를 갖는 것을 특징으로 하는 투명 교정용 다중층 시트 제조 방법.The rigid thermoplastic polymer material has a yield strength (Yield strength) of 40 MPa or more and 60 MPa or less, and has an elastic modulus (Young's modulus) of 1500 MPa or more and 2200 MPa or less.
PCT/KR2021/002818 2020-03-19 2021-03-08 Method for manufacturing multilayer sheet for transparent braces WO2021187786A1 (en)

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