Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multi-layer film and preparation method thereof

A multi-layer film and unit layer technology, applied in the field of materials, can solve problems such as difficulty in removing straps and reduced comfort, and achieve the effect of optimizing toughness and hardness and increasing taste comfort

Inactive Publication Date: 2019-03-29
四川雅齐医疗科技有限公司
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of invisible orthodontics, the use of braces for orthodontic treatment is more and more selected and accepted by patients, but the material of the invisible braces used in the prior art is uniform, and the thickness of the diaphragm is about 0.6-0.75mm, and the selectivity is small. It is difficult for patients with periodontal disease or patients with attachments to take off the belt, and the thicker the braces, the stronger the foreign body sensation and the decrease in comfort

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi-layer film and preparation method thereof
  • Multi-layer film and preparation method thereof
  • Multi-layer film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Three-layer diaphragm TPU-PETG-TPU

[0049] S1: Dry the raw materials of the three unit layers, wherein the drying temperature is 98 ° C, and the drying time is 4 hours; the parameter characteristics of the raw materials are shown in the following table:

[0050]

[0051] S2: Add each unit layer raw material after the above drying into a single / twin-screw extrusion system through a separate passage, and pass through a feeding section, a melting section, a homogenizing section and an extrusion section, and the screw speed is 70 rpm; Die head width is 200mm, and die head temperature is 140 ℃; Obtain rough multi-layer sheet; Wherein, the temperature of feeding section is 190 ℃; The temperature of melting section is 210 ℃; The homogenization temperature of the unit layers on both sides is 230°C.

[0052] S3: The extruded crude sheet is rolled by three rollers, the temperature of the upper roller is 80°C, the temperature of the middle roller is 70°C, and the te...

Embodiment 2

[0054] Example 2 Three-layer membrane PETG-TPU-PETG

[0055] Embodiment 2 is similar in structure and preparation method to Embodiment 1, the difference is that the raw materials of each unit layer are different, and the technical parameters involved in the preparation method are different, specifically:

[0056] The parameters of each unit layer are as follows:

[0057]

[0058] The technical parameters involved in the preparation method are as follows:

[0059] S1: Among them, the drying temperature is 130°C, and the drying time is 3 hours;

[0060] S2: Among them, the screw speed is 5 rpm; the width of the die head is 160mm, the temperature of the die head is 200°C; the temperature of the feeding section is 205°C; the temperature of the melting section is 250°C; the homogenization temperature of the middle unit layer is 270°C °C, and the homogenization temperature of the unit layers on both sides is 250 °C.

[0061] S3: Among them, the temperature of the three floatin...

Embodiment 3

[0063] Example 3 Three-layer film PETG-PETG-PETG

[0064] Embodiment 3 is similar in structure and preparation method to Embodiment 1, the difference is that the raw materials of each unit layer are different, and the technical parameters involved in the preparation method are different, specifically:

[0065] The parameters of each unit layer are as follows:

[0066]

[0067] The technical parameters involved in the preparation method are as follows:

[0068] S1: Among them, the drying temperature is 90°C, and the drying time is 6 hours;

[0069] S2: Among them, the screw speed is 100 rpm; the die head width is 1200mm, the die head temperature is 180°C; the temperature of the feeding section is 180°C; the temperature of the melting section is 260°C; the homogenization temperature of the middle unit layer is 260°C °C, and the homogenization temperature of the unit layers on both sides is 240 °C.

[0070] S3: Among them, the temperature of the three floating rollers is 60...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Tear resistanceaaaaaaaaaa
Thicknessaaaaaaaaaa
Tear resistanceaaaaaaaaaa
Login to View More

Abstract

The invention discloses a multi-layer film comprising a laminated 2n+1 unit layers, wherein n is more than or equal to 1, and the hardness of an intermediate unit layer is the highest, the hardness ofunit layers at two sides decreases in turn or the unit layers with different hardnesses are alternately stacked, and the hardnesses of unit layers at two outermost sides are respectively less than those of adjacent unit layers; the total flexural elastic modulus of the multi-layer film is 600-2000 MPa, the tear resistance is 200-500 N / cm and the thickness is 0.5-1.1 mm. A preparation method comprises the steps of drying, feeding, melting, homogenizing and extrusion, rolling and preparing the multi-layer film. With the multi-layer film stacking arrangement method, films with different properties can be chosen for personalized customization, and both sides of the films are soft. When the film is made into dental brackets subsequently, the mouthfeel comfort of wearing is increased. The preparation method adopts the co-extrusion method, and the performance of the multi-layer film achieves the best effect under the specific operating parameters.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a diaphragm and a preparation method thereof, in particular to a multilayer diaphragm and a preparation method thereof. Background technique [0002] Traditional orthodontic treatment is mainly to set brackets and arch wires on the surface of the tooth list to play a role in orthodontic treatment, and to perform orthodontic treatment by twisting and pushing. For the sake of aesthetics, the braces are transferred from the lip side to the lingual side, which cannot be seen from the outside. However, this method has higher requirements on the doctor, and the patient’s oral cavity is more damaged. Not only the foreign body sensation is enhanced, but also the cost is high. With the advancement of technology, invisible orthodontics are more and more accepted and used by patients. Invisible orthodontics without brackets is a computer-aided design and production of transparent elastic material mov...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): A61C7/00B29D7/01
CPCA61C7/00B29D7/01
Inventor 刘喆威查凯姚峻峰
Owner 四川雅齐医疗科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com