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
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  • 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

Method used

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  • 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

Example Embodiment

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

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

[0050]

[0051] S2: each unit layer raw material after the above-mentioned drying is added in the single / twin screw extrusion system with a separate channel, through the feeding section, the melting section, the homogenizing section and the extrusion section, the screw speed is 70 rev / min; The width of the die head is 200mm, and the temperature of the die head is 140°C; a crude multi-layer sheet is obtained; wherein, the temperature of the feeding section is 190°C; the temperature of the melting section is 210°C; the homogenization temperature of the intermediate unit layer is 240°C, The homogenization temperature of the unit layers on both sides was 230°C.

[0052] S3: rolling the extruded crude sheet through ...

Example Embodiment

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

[0055] The structure and preparation method of Example 2 are similar to those of Example 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℃, and the drying time is 3h;

[0060] S2: wherein, the screw speed is 5 rev / min; the die width is 160mm, and the die temperature 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 intermediate 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 floating rolls is that...

Example Embodiment

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

[0064] The structure and preparation method of Example 3 are similar to those of Example 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 6h;

[0069] S2: wherein, the screw speed is 100 rpm; the die width is 1200 mm, and the die 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 intermediate 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 rolls ...

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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

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Application Information

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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
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