CN109528322A - Multilayer Film and preparation method thereof - Google Patents
Multilayer Film and preparation method thereof Download PDFInfo
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- CN109528322A CN109528322A CN201811349930.2A CN201811349930A CN109528322A CN 109528322 A CN109528322 A CN 109528322A CN 201811349930 A CN201811349930 A CN 201811349930A CN 109528322 A CN109528322 A CN 109528322A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
Abstract
The invention discloses a kind of Multilayer Films, it includes 2n+1 elementary layer of stacking, wherein n >=1, and the hardness highest of temporary location layer, the hardness of two sides elementary layer is successively successively decreased or soft or hard alternately laminated, and the hardness of the elementary layer of outermost two sides is respectively smaller than the hardness of elementary layer adjacent thereto；The total flexural modulus of elasticity of Multilayer Film is 600~2000MPa, tear resistance 200-500N/cm, with a thickness of 0.5~1.1mm.Preparation method is to roll using drying, feeding, melting, homogenizing and squeezing out, Multilayer Film is made.The set-up mode being laminated using Multilayer Film can select diaphragm of different nature to carry out personalized customization, and the two sides of diaphragm is soft face, subsequent when being made as facing, and the comfortable taste degree of wearing increases.The method that preparation method uses co-extrusion, under specific operating parameter, so that the performance of Multilayer Film reaches best.
Description
Technical field
The invention belongs to Material Field, be related to a kind of diaphragm and preparation method thereof, and in particular to a kind of Multilayer Film and its
Preparation method.
Background technique
Mainly bracket and arch wire is arranged on denture surface in traditional orthodontic, plays correcting action, by torsion and
The mode of passage is rescued.For beauty, facing has been transferred to tongue side by lip side, can't see in appearance, but this side
For method to the more demanding of doctor, patient's injury of mouth is larger, and not only foreign body sensation enhances, and cost is higher.With technology into
Step, invisalign are increasingly received and are used by patient, and no bracket invisalign is a kind of computer-aided design and manufacture
Transparent elastic material movable correcting device, it is the orthotic device of a Sequentially continuous, mobile by constantly small range tooth, is reached
Purpose is rescued to tooth.The facing not only can control the size of Orthodontic force, but also can control the time of Orthodontic force effect,
Only certain teeth can move different phase, and other tooth is as anchorage, to complete the correction of tooth.In invisalign
Field is rescued using facing and is increasingly selected and received by patient, but stealth facing material used in the prior art
To be uniform, the thickness of diaphragm is about 0.6~0.75mm, and selectivity is smaller, for patients with periodontal disease or is pasted with attached
The band of plucking of the patient of part causes difficulty, and the foreign body sensation that the thicker patient of facing wears is stronger, degree of comfort decreased.
Therefore, a kind of Multilayer Film with personalized customization is studied, the comfort level worn in patient oral cavity is increased
On the basis of, flexibility and the higher diaphragm of pliability, the production for carrying out facing have great importance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Multilayer Film and preparation method thereof, using multilayer film lamella
Folded set-up mode can select diaphragm of different nature to carry out personalized customization, and the two sides of diaphragm is soft face, subsequent
When being made as facing, the comfortable taste degree of wearing increases.The method that preparation method uses co-extrusion, in specific operating parameter
Under, so that the performance of Multilayer Film reaches best.
In order to solve the above technical problems, the technical solution used in the present invention is:
A kind of Multilayer Film, its 2n+1 elementary layer comprising stacking, wherein n >=1, and the hardness highest of temporary location layer, two
The hardness of side unit layer is successively successively decreased or soft or hard alternately laminated, and the hardness of the elementary layer of outermost two sides is respectively smaller than list adjacent thereto
The hardness of first layer；The total flexural modulus of elasticity of Multilayer Film is 600~2000MPa, tear resistance 200-500N/cm, thickness
For 0.5~1.1mm.
Hardness of the outermost elementary layer hardness of the Multilayer Film relative to its adjacent cells layer, so that the subsequent pressure of diaphragm
It is soft face with the face of teeth contact and with the face of oral contact, comfortable taste degree increases after facing is made.
As a kind of restriction of the invention, centered on temporary location layer, the hardness of two sides symmetrical cell layer is identical.Work as film
After piece heats and softens, since the hardness of two sides symmetrical cell layer is identical, suffered thermal distortion forces are also identical, the shape of material
Variable is also identical, therefore can guarantee that the heat distortion amount of material is uniform, controllable.
As further limiting for above-mentioned restriction, the unit layer material is PETG or TPU, wherein the tear-proof of PETG
Property be 200~420N/cm, flexural modulus of elasticity is 76~2400 MPa, and the tear resistance of TPU is 260~460N/cm, flexure
Elasticity modulus is 76~2500MPa.Tear resistance and the flexural modulus of elasticity control of elementary layer within the above range, can guarantee
Total flexural modulus of elasticity of integral multi-layered diaphragm is 600~2000MPa, tear resistance 200-500N/cm.
Another kind as above-mentioned restriction further limits, the 60- of the total thickness of thickness Zhan of the temporary location layer
90%, the 5-20% of the thickness difference total thickness of Zhan of two sides symmetrical cell layer.Temporary location layer has relative to two sides symmetrical cell layer
Have higher thickness, due to temporary location layer hardness also above two sides symmetrical cell layer hardness, it may therefore be assured that whole
The hardness and toughness of diaphragm.
The present invention also provides the method for preparing above-mentioned Multilayer Film, it the following steps are included:
S1: each elementary layer material feedstock is dried, and wherein drying temperature is 80 ~ 130 DEG C, and drying time is 3 ~ 6h；
S2: by each elementary layer raw material after above-mentioned drying with individual channel be added mono-/bis-Screw Extrusion system in, by into
Material section, homogenizes section and extruding zone at melt zone, obtains crude multi-layer sheet；
Wherein, parameter involved in mono-/bis-Screw Extrusion system are as follows: screw speed is 5 ~ 100 turns/min；Die width is
160 ~ 1200mm, die head temperature are 140 ~ 200 DEG C；
S3: the crude sheet material after extrusion rolls in sheet forming system, and Multilayer Film is made.
As a kind of restriction of the invention, the drying temperature of temporary location layer is higher than the dry of other elementary layers in the S1
Dry temperature.
It is limited as another kind of the invention, the temperature of feed zone is 180-250 DEG C in the S2；Melt zone temperature is
210~260℃；Homogenizing section temperature is 230-270 DEG C；Wherein section temperature that homogenizes of temporary location layer is higher than other preparation sections.
As further limiting for above-mentioned restriction, in the S2, if centered on temporary location layer, two sides symmetrical cell
When the material character of layer is consistent, material can be in same channel addition mono-/bis-Screw Extrusion system, mono-/bis-Screw Extrusion system
It is separated into respective layer.Mono-/bis-Screw Extrusion system can be added in same channel in material, can save channel,
The present invention is there are also a kind of restriction, and sheet forming system is three floating billowing pressures in the S3, and three floating rollings are distinguished
For rolling of floating, in float rolling and float downward rolling；The temperature of the rolling floating rolling is 40 DEG C~80 DEG C；The temperature of rolling is floated in the rolling
Degree is 38 DEG C~70 DEG C；The temperature that rolling is floated downward in the rolling is 35 DEG C~60 DEG C.
As further limiting for above-mentioned restriction, the described first floating rolling, the second floating rolling and third it is floating roll temperature according to
It is secondary to successively decrease.
There are also a kind of restrictions by the present invention, are also covered with protective film on the Multilayer Film after rolling, protective film with a thickness of
0.02~0.1mm, the material of protective film are PE film or PVC film etc..
There are also a kind of restrictions by the present invention, and the diaphragm for being covered with protective film is cut, and the diaphragm is cut into predetermined ruler
Very little sheet material, sheet material are put into punching machine, strike out disk.
Due to the adoption of the above technical solution, compared with prior art, the present invention acquired technological progress is:
The set-up mode being laminated using Multilayer Film can select diaphragm of different nature to carry out personalized customization, and diaphragm
Two sides be soft face, subsequent when being made as facing, the comfortable taste degree of wearing increases.Preparation method uses the side of co-extrusion
Method, under specific operating parameter, so that the performance of Multilayer Film reaches best.First respectively to the material of each unit layer into
Row removal moisture drying ensures subsequent material melting, and when extrusion molding not will receive the influence of moisture.To each unit layer respectively each
From screw extruder in melt, homogenize, obtain stable viscous state high molecular material, filter out suitable Screw Parameters, make
The subchain that secures satisfactory grades section sufficient movement, adjustment conformation reach so that the mechanical property of extrusion sheet is selected and be optimized to rigid
The selection and optimization of property, toughness and hardness.Secondly, being realized by the adjustment of the parameters such as feed quantity, screw speed, die head to each
The adjustment of the thickness of elementary layer, to realize the influence to mechanical property in thickness level.Again, billowing by repeatedly floating
Pressure, and the adjustment to rolling temperatures, pressure, revolving speed, hauling speed realize the conformable layer to each unit layer separated originally
Pressure；And the pressure and temperature effect by rolling, make to be physical crosslinking between each unit layer, to form the multilayer of stable structure
Appliance diaphragm.More specifically, the parameter of preparation process is preferred, so that realizing an elementary layer physical property by multilayered structure
Recombinant and adjusting, rigidity, toughness and the satisfactory diaphragm of hardness is made to prepare.
The present invention is suitable for the preparation of Multilayer Film, and preparation multilayer facing.
The present invention is described in further detail below in conjunction with specific embodiment.
Specific embodiment
To make the above purposes, features and advantages of the invention more obvious and understandable, below to specific reality of the invention
Example is applied to be described in detail.
A kind of Multilayer Film, it includes 2n+1 elementary layer of stacking, wherein n >=1, and the hardness of temporary location layer is most
Height, the hardness of two sides elementary layer are successively successively decreased or soft or hard alternately laminated, and the hardness of the elementary layer of outermost two sides is respectively smaller than and it
The hardness of adjacent cells layer；The total hardness of Multilayer Film≤75D(Shore hardness), flexural modulus of elasticity is 600~2000MPa,
Tear resistance is 200-500N/cm, with a thickness of 0.5~1.1mm.The outermost elementary layer hardness of the Multilayer Film is relative to it
The hardness of adjacent cells layer so that diaphragm is subsequent be pressed into facing after, be with the face of teeth contact and with the face of oral contact
Soft face, comfortable taste degree increase.
In one of the embodiments, centered on temporary location layer, the hardness of two sides symmetrical cell layer is identical.It needs
Bright is after diaphragm heats and softens, and since the hardness of two sides symmetrical cell layer is identical, suffered thermal distortion forces are also identical
, the deformation quantity of material is also identical, therefore can guarantee that the heat distortion amount of material is uniform, controllable.
The unit layer material is PETG or TPU in one of the embodiments, wherein the hardness of PETG be 40~
78D, tear resistance are 200~420N/cm, and flexural modulus of elasticity is 76~2400 MPa, and the hardness of TPU is 40~82D, anti-tear
Fragility is 260~460N/cm, and flexural modulus of elasticity is 76~2500MPa.The tear resistance of elementary layer and flexural modulus of elasticity control
System within the above range, can guarantee that total flexural modulus of elasticity of integral multi-layered diaphragm is 600~2000MPa, tear resistance
For 200-500N/cm.
The 60-90% of the total thickness of thickness Zhan of the temporary location layer in one of the embodiments, two sides are symmetrically single
The 5-20% of the thickness difference total thickness of Zhan of first layer.It should be noted that temporary location layer has relative to two sides symmetrical cell layer
Higher thickness, due to temporary location layer hardness also above two sides symmetrical cell layer hardness, it may therefore be assured that integral membrane
The hardness and toughness of piece.
The method for preparing above-mentioned Multilayer Film, it the following steps are included:
S1: by the processing of each elementary layer raw material drying, wherein drying temperature is 80 ~ 130 DEG C, and drying time is 3 ~ 6h；
Specifically, each elementary layer raw material can be dehumidified and is dried, to prevent moisture in PETG etc. from generating shadow to it
It rings.
S2: each elementary layer raw material after above-mentioned drying is added in mono-/bis-Screw Extrusion system with individual channel, warp
It crosses feed zone, melt zone, homogenize section and extruding zone, obtain crude multi-layer sheet；Wherein, involved in mono-/bis-Screw Extrusion system
And parameter are as follows: screw speed be 5 ~ 100 turns/min；Die width is 160 ~ 1200mm, and temperature is 140-200 DEG C；
Specifically, so that each elementary layer raw material after dry enters mono-/bis-screw extruder, Mei Gedan by individual channel
First layer raw material is in molten condition, then squeezes out from die head.Each elementary layer raw material is during mono-/bis-Screw Extrusion, Mei Gedan
First layer raw material is in molten condition, and each elementary layer raw material moves at high temperature, then certain cooling is carried out by die head,
Conveniently it is molded into sheet material.In addition, screw rod melting temperature is different, under each elementary layer raw material molten condition, the degree of molecular motion is not
Equally, so that the mechanical property of each elementary layer raw material after squeezing out can be different.
It should be noted that can by the selection of die head, each elementary layer raw material after determining mono-/bis-Screw Extrusion
Shape.In the present embodiment, each elementary layer raw material after mono-/bis-Screw Extrusion is with certain thickness each unit
Layer of sheet material.At this point, having carried out first adjustment by thickness of the die head to each elementary layer.
S3: the crude sheet material after extrusion rolls in sheet forming system, and Multilayer Film is made.
Specifically, the Multilayer Film squeezed out in step S2 is rolled by roller press.In one embodiment, squeeze out
The Multilayer Film afterwards by three floating billowing pressures, three floating rollings be respectively float rolling, in float rolling and float downward rolling.It floats
The temperature of rolling be 40 DEG C -80 DEG C, in float rolling temperature be 38 DEG C -70 DEG C, float downward rolling temperature be 35 DEG C -60 DEG C.By three
Floating billowing pressure, obtains required diaphragm thickness, wherein floating rolling can adjust the thickness of diaphragm, realizes the further essence to diaphragm thickness
Really adjustment.Rolling is floated in rolling and rolls the spacing for floating downward rolling wherein it is possible to adjust, and to adjust the thickness of diaphragm, and is accurately adjusted
The thickness of good diaphragm.It should be noted that the thickness of diaphragm can be determined according to actual needs, the thickness of diaphragm can be
0.5mm, 0.75mm, 1.0mm etc..
The drying temperature of temporary location layer is higher than the drying of other elementary layers in S1 described in one of the embodiments,
Temperature.
The temperature of feed zone is 180-250 DEG C in the S2 in one of the embodiments,；Melt zone temperature be 210 ~
260℃；Homogenizing section temperature is 230-270 DEG C；Wherein section temperature that homogenizes of temporary location layer is higher than other preparation sections.
In the S2, if when the material character of two sides symmetrical cell layer is consistent, material can centered on temporary location layer
Mono-/bis-Screw Extrusion system is added in same channel, is separated into respective layer in mono-/bis-Screw Extrusion system.Material can be
Mono-/bis-Screw Extrusion system is added in same channel, can save channel.
Sheet forming system is three floating billowing pressures, three floating rollings in the S3 in one of the embodiments,
Respectively float rolling, in float rolling and float downward rolling；The temperature of the rolling floating rolling is 40 DEG C~80 DEG C；Rolling is floated in the rolling
Temperature be 38 DEG C~70 DEG C；The temperature that rolling is floated downward in the rolling is 35 DEG C~60 DEG C.
In one of the embodiments, the floating rolling, in float rolling and float downward the temperature of rolling and successively successively decrease.
Protective film is enclosed on the surface of diaphragm in one of the embodiments,.By the setting of protective film, film is avoided
The surface scratching etc. of piece.In one embodiment, which is PE film.It should be noted that the protective film may be PVC film
Deng.Wherein, the thickness of protective film can be 0.02~0.1mm.In the present embodiment, protective film with a thickness of 0.05mm.In addition,
It should be noted that protective film can be enclosed on a surface of diaphragm, it can also be on two opposite surfaces of diaphragm
Enclose protective film.
The diaphragm for being covered with protective film is cut in one of the embodiments, the membrane cutting after protective film will be enclosed
It is cut into the rectangular sheet of predetermined size.Wherein, predetermined size herein and is not construed as limiting according to determining needed for production.Further
Rectangular sheet is put into punching machine by ground in one embodiment, and strikes out disk.Specifically, the diaphragm for enclosing protective film is cut out
It is cut into the rectangular sheet of specific dimensions, then is tested.After the assay was approved, it then is carried out striking out disk.Wherein, disk
Diameter can be 125mm.
Below by way of specific embodiment, the invention will be further elaborated.
1 trilamellar membrane piece TPU-PETG-TPU of embodiment
S1: three elementary layer raw material dryings are handled, and wherein drying temperature is 98 DEG C, drying time 4h；The wherein ginseng of raw material
Number characteristic is as shown in the table:
S2: by each elementary layer raw material after above-mentioned drying with individual channel be added mono-/bis-Screw Extrusion system in, by into
Material section, melt zone homogenize section and extruding zone, and screw speed is 70 turns/min；Die width is 200mm, die head temperature 140
℃；Obtain crude multi-layer sheet；Wherein, the temperature of feed zone is 190 DEG C；Melt zone temperature is 210 DEG C；Temporary location layer it is even
Changing temperature is 240 DEG C, and the temperature that homogenizes of two sides elementary layer is 230 DEG C.
S3: by the crude sheet material after extrusion, by three floating pressures that billow, three floating rollings are respectively that the temperature of floating rolling is 80
DEG C, in float that the temperature of rolling is 70 DEG C and to float downward the temperature of rolling be 60 DEG C, Multilayer Film is finally made.
G layers of middle layer of PET of thickness of final Multilayer Film obtained accounts for the 80% of overall thickness as 0.6mm, the TPU of two sides
The thickness of layer accounts for the 10% of overall thickness respectively as 0.075mm.The hardness of Multilayer Film be 70D, flexural modulus of elasticity 1662MPa,
With a thickness of 0.75mm, tear resistance: 372N/cm.
2 trilamellar membrane piece PETG-TPU-PETG of embodiment
Embodiment 2 is similar to the structure of embodiment 1 and preparation method, and difference is that the raw material of each elementary layer is different, preparation side
Technical parameter involved in method is different, specifically:
The parameter of each elementary layer is as follows:
Technical parameter involved in preparation method is as follows:
S1: where drying temperature is 130 DEG C, drying time 3h；
S2: where screw speed is 5 turns/min；Die width is 160mm, and die head temperature is 200 DEG C；The temperature of feed zone is
205℃；Melt zone temperature is 250 DEG C；The temperature that homogenizes of temporary location layer is 270 DEG C, and the temperature that homogenizes of two sides elementary layer is 250
℃。
S3: where three floating rollings be respectively float rolling temperature be 40 DEG C, in float the temperature of rolling and be 38 DEG C and float downward rolling
Temperature be 35 DEG C.
The thickness of the middle layer TPU layer of final Multilayer Film obtained accounts for the 90% of overall thickness as 0.6mm, the PETG of two sides
The thickness of layer accounts for the 5% of overall thickness respectively as 0.2mm.The hardness of Multilayer Film is 75D, flexural modulus of elasticity 1979MPa, is resisted
Lancinating: 407N/cm, with a thickness of 1.0mm.
3 trilamellar membrane piece PETG- PETG- PETG of embodiment
Embodiment 3 is similar to the structure of embodiment 1 and preparation method, and difference is that the raw material of each elementary layer is different, preparation side
Technical parameter involved in method is different, specifically:
The parameter of each elementary layer is as follows:
Technical parameter involved in preparation method is as follows:
S1: where drying temperature is 90 DEG C, drying time 6h；
S2: where screw speed is 100 turns/min；Die width is 1200mm, and die head temperature is 180 DEG C；The temperature of feed zone
Degree is 180 DEG C；Melt zone temperature is 260 DEG C；The temperature that homogenizes of temporary location layer is 260 DEG C, and two sides elementary layer homogenizes temperature
It is 240 DEG C.
S3: where three floating rollings be respectively float rolling temperature be 60 DEG C, in float the temperature of rolling and be 50 DEG C and float downward rolling
Temperature be 40 DEG C.
The thickness of the middle layer TPU layer of final Multilayer Film obtained accounts for the 70% of overall thickness as 0.35mm, the PETG of two sides
The thickness of layer accounts for the 15% of overall thickness respectively as 0.075mm.The hardness of Multilayer Film be 68D, flexural modulus of elasticity 1655MPa,
Tear resistance: 200N/cm, with a thickness of 0.5mm.
4 trilamellar membrane piece TPU- TPU- TPU of embodiment
Embodiment 4 is similar to the structure of embodiment 1 and preparation method, and difference is that the raw material of each elementary layer is different, preparation side
Technical parameter involved in method is different, specifically:
The parameter of each elementary layer is as follows:
Technical parameter involved in preparation method is as follows:
S1: where drying temperature is 110 DEG C, drying time 5h；
S2: where screw speed is 30 turns/min；Die width is 1000mm, die head temperature is 160 DEG C；The temperature of feed zone
Degree is 250 DEG C；Melt zone temperature is 230 DEG C；The temperature that homogenizes of temporary location layer is 260 DEG C, and two sides elementary layer homogenizes temperature
It is 240 DEG C.
S3: where three floating rollings be respectively float rolling temperature be 50 DEG C, in float the temperature of rolling and be 45 DEG C and float downward rolling
Temperature be 40 DEG C.
The thickness of the middle layer TPU layer of final Multilayer Film obtained accounts for the 80% of overall thickness as 0.88mm, the TPU of two sides
The thickness of layer accounts for the 10% of overall thickness respectively as 0.11mm.The hardness of Multilayer Film be 75D, flexural modulus of elasticity 1993MPa,
Tear resistance is 500N/cm, with a thickness of 1.1mm.
5 five tunic piece TPU- TPU- TPU-TPU- TPU of embodiment
The sequence of the Multilayer Film of five elementary layers superposition, each elementary layer superposition is A layers-B layers-C layers-D layers-E- layers, wherein
Material used in described-B layers-C layers-D layers-E- layers of A layer is TPU, and hardness, flexural modulus of elasticity are as shown in the table:
Technical parameter involved in preparation method is as follows:
S1: where drying temperature is 110 DEG C, drying time 5h；
S2: where screw speed is 30 turns/min；Die width is 1000mm, and die head temperature is 150 DEG C；The temperature of feed zone
It is 230 DEG C；Melt zone temperature is 220 DEG C；The temperature that homogenizes of temporary location layer is 270 DEG C, and the temperature that homogenizes of two sides elementary layer is
250 DEG C, the temperature that homogenizes of outermost two sides elementary layer is 230 DEG C.
S3: where three floating rollings be respectively float rolling temperature be 50 DEG C, in float the temperature of rolling and be 45 DEG C and float downward rolling
Temperature be 40 DEG C.
It is 0.6mm that the thickness of the middle layer TPU layer of final Multilayer Film obtained, which accounts for the 60% of overall thickness, intermediate two sides
The thickness of TPU layer accounts for the 15% of overall thickness respectively as 0.15mm, and what the thickness of outermost TPU layer accounted for overall thickness respectively 5% is
0.05mm.The hardness of Multilayer Film is 75D, flexural modulus of elasticity 1579MPa, tear resistance 472N/cm, with a thickness of 1.0
mm。
Comparative example
Embodiment 1 and duplicature piece performance are compared, wherein the PETG-TPU that the double-deck diaphragm is 0.75mm form (wherein
The thickness of PETG is identical as the PETG thickness in embodiment 1, PETG thickness is greater than the thickness of PETG in embodiment 1), preparation
Method is identical as the preparation method in embodiment 1, and properties of product comparing result obtained is as follows:
The result shows that diaphragm obtained by the embodiment of the present invention is lower than the hardness of the double-deck diaphragm, flexibility is greater than the double-deck diaphragm, more
Flexible and not easy to break.
The above described is only a preferred embodiment of the present invention, being not the restriction for making other forms to the present invention, appoint
What those skilled in the art is changed or is modified as equivalent variations as enlightenment possibly also with above-mentioned technology contents
Equivalent embodiment.But it is all without departing from the technology of the present invention design, above embodiments are made according to the technical essence of the invention
Simple modification out, equivalent variations and remodeling, still fall within the protection scope of the claims in the present invention.
Claims (10)
1. a kind of Multilayer Film, it is characterised in that: it includes 2n+1 elementary layer of stacking, wherein n >=1, and temporary location layer
Hardness highest, the hardness of two sides elementary layer successively successively decreases or soft or hard alternately laminated, the hardness difference of the elementary layer of outermost two sides
Less than the hardness of elementary layer adjacent thereto；The total flexural modulus of elasticity of Multilayer Film is 600~2000MPa, and tear resistance is
200-500N/cm, with a thickness of 0.5~1.1mm.
2. Multilayer Film according to claim 1, it is characterised in that: centered on temporary location layer, two sides symmetrical cell
The hardness of layer is identical.
3. Multilayer Film according to claim 2, it is characterised in that: the unit layer material is PETG or TPU, wherein
The tear resistance of PETG is 200~420N/cm, and flexural modulus of elasticity is 76~2400 MPa, the tear resistance of TPU is 260~
460N/cm, flexural modulus of elasticity are 76~2500MPa.
4. Multilayer Film according to claim 2, it is characterised in that: the total thickness of thickness Zhan of the temporary location layer
60-90%, the 5-20% of the thickness difference total thickness of Zhan of two sides symmetrical cell layer.
5. a kind of prepare the method such as Multilayer Film in Claims 1 to 4, it is characterised in that: it the following steps are included:
S1: by the processing of each elementary layer raw material drying, wherein drying temperature is 80 ~ 130 DEG C, and drying time is 3 ~ 6h；
S2: by each elementary layer raw material after above-mentioned drying with individual channel be added mono-/bis-Screw Extrusion system in, by into
Material section, homogenizes section and extruding zone at melt zone, obtains crude multi-layer sheet；
Wherein, parameter involved in mono-/bis-Screw Extrusion system are as follows: screw speed is 5 ~ 100 turns/min；Die width is
160 ~ 1200mm, die head temperature are 140 ~ 200 DEG C；
S3: the crude sheet material after extrusion rolls in sheet forming system, and Multilayer Film is made.
6. the method according to claim 5 for preparing Multilayer Film, it is characterised in that: temporary location layer in the S1
Drying temperature is higher than the drying temperature of other elementary layers.
7. the method according to claim 5 for preparing Multilayer Film, it is characterised in that: the temperature of feed zone in the S2
It is 180-250 DEG C；Melt zone temperature is 210 ~ 260 DEG C；Homogenizing section temperature is 230-270 DEG C；Wherein temporary location layer homogenizes
Duan Wendu is higher than other preparation sections.
8. the method according to claim 7 for preparing Multilayer Film, it is characterised in that: in the S2, if with intermediate single
Centered on first layer, when the material character of two sides symmetrical cell layer is consistent, mono-/bis-Screw Extrusion system can be added in same channel in material
It unites, is separated into respective layer in mono-/bis-Screw Extrusion system.
9. the method according to claim 5 for preparing Multilayer Film, it is characterised in that: sheet forming system in the S3
For three floating billowing pressures, three floating rollings be respectively float rolling, in float rolling and float downward rolling；The temperature of the rolling floating rolling
It is 40 DEG C~80 DEG C；The temperature that rolling is floated in the rolling is 38 DEG C~70 DEG C；The temperature that rolling is floated downward in the rolling is 35 DEG C~60
℃。
10. the method according to claim 9 for preparing Multilayer Film, it is characterised in that: the floating rolling of described first, second float
Rolling and third it is floating roll temperature is successively successively decreased.
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| CN111096814A (en) * | 2019-12-27 | 2020-05-05 | 上海牙典医疗器械有限公司 | Method and device for generating appliance |
| CN112998884A (en) * | 2021-02-24 | 2021-06-22 | 吉林大学 | Long-acting antibacterial material, dental diaphragm and long-acting invisible appliance |
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