CN107471621B - The preparation method of multi-layer co-extrusion two-way stretching laminated film - Google Patents
The preparation method of multi-layer co-extrusion two-way stretching laminated film Download PDFInfo
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- CN107471621B CN107471621B CN201710820246.7A CN201710820246A CN107471621B CN 107471621 B CN107471621 B CN 107471621B CN 201710820246 A CN201710820246 A CN 201710820246A CN 107471621 B CN107471621 B CN 107471621B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
- B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
- B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
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- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The present invention relates to a kind of preparation methods of multi-layer co-extrusion two-way stretching laminated film, it is prepared in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch, specifically: first time fusion drawn first being carried out to longitudinal and transverse direction by periosteum synchro-draw using co-extruding tube embrane method moulding process, obtain tubulose film bubble, then the double-deck diaphragm or single layer diaphragm are obtained by tubulose film bubble is flat-folded, then the double-deck diaphragm or single layer diaphragm are pre-processed, longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength again, then, by Flat film strength to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm carry out the laterally non-melt stretching of third time, finally the double-deck diaphragm or single layer diaphragm are post-processed, to obtain biaxial tension laminated film.
Description
Technical field
The present invention relates to a kind of preparation methods of multi-layer co-extrusion two-way stretching laminated film.
Background technique
Periosteum method synchro-draw peace embrane method biaxial tension is two kinds of common bidirectional stretching plastic film production technologies, two
Kind production technology respectively has its advantage and disadvantage.
When the synchro-draw of periosteum method forms tubulose film bubble by inflation, the biaxial tension of film longitudinal and transverse direction is completed.The method
Principle be first to squeeze out a tube, then use water-bath cooling tube, between first and second pairs of folder rods, cross directional stretch is
It is formed by air pressure conditions in appropriate adjustment film bubble, longitudinal stretching is to adjust the speed between first and second pairs of nip rolls
Difference is spent to reach.The oriented film performance that periosteum pulling method produces is uniform, but shrinking percentage it is low, it is in uneven thickness, can not
Precise control of temperature and draw ratio, low heat-sealing temperature resin have adhesion problem.
Flat membrane method biaxial tension be the melt of high molecular polymer or solution are passed through first long and narrow head be made sheet material or
Thick film, then in dedicated stretching-machine, at certain temperature and the speed of setting, while or step by step in two vertical sides
The stretching carried out on (longitudinally, laterally), and be made by cooling appropriate or heat treatment or special processing (corona etc.) thin
Film.This kind of technique can be such that the longitudinal and transverse direction mechanical performance of film is uniformly balanced, while production that can also be intentional
Provide the film of vertical and horizontal different performance.Flat membrane method biaxial tension includes synchro-draw method and two-step stretch method, is synchronized
Film performance that pulling method is produced uniformly and be untouchable stretching, but production equipment complicated in mechanical structure, flexibility it is low,
Speed of production is low；The film that two-step stretch method produces has splendid flexibility, thickness, and uniformly good and shrinking percentage is low, but property
It can be unbalanced.
Summary of the invention
It is an object of the present invention to provide a kind of preparation methods of multi-layer co-extrusion two-way stretching laminated film.
In order to achieve the above objectives, the first technical solution that the present invention uses is: a kind of multi-layer co-extrusion two-way stretching THIN COMPOSITE
The preparation method of film, innovation are:
Contain main tensile layer in the laminated film, which is PET, and main tensile layer thickness accounts for laminated film
At least the 30% of overall thickness；
For the laminated film, made in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch
It is standby, specifically: melting for the first time first being synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process and is drawn
It stretches, obtains tubular film, then obtain the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when
Squeeze out film bubble inner layer material temperature at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble
When the temperature of inner layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are carried out pre-
Processing, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength, then, by flat
Film stretching method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm to carry out laterally third time non-melt
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technique is joined
Number and requirement are as follows:
First, synchro-draw multiplying power is 2 ~ 8 in the co-extruding tube embrane method moulding process, and draft temperature is in main stretching layer material
± 0 ~ 10 DEG C on the basis of melting temperature；
Second, the pretreatment is to carry out stress for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing for removing, treatment temperature are to reduce 20 ~ 120 DEG C on the basis of draft temperature；
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the glass transition temperature of the adhesive layer is lower than main drawing
The glass transition temperature for stretching layer, simultaneously above the brittle temperature of main tensile layer；
4th, non-melt stretch in second of the longitudinal direction uses single-point or multiple spot stretching mode, and stretching ratio is 2 ~ 4.5,
Draft temperature is between the glass transition temperature and melting temperature of main tensile layer, and the glass transition temperature of close main tensile layer；
5th, in the laterally non-melt stretching of third time, stretching ratio is 2 ~ 4.5, glass of the draft temperature in main tensile layer
Between glass temperature and melting temperature, and close to the melting temperature of main tensile layer；
6th, the post-processing is to carry out stress elimination for the double-deck diaphragm obtained after the laterally non-melt stretching of third time
Processing, post-processing temperature are to increase by 20 ~ 140 DEG C on the basis of laterally third time non-melt draft temperature.
In order to achieve the above objectives, the second technical solution that the present invention uses is: a kind of multi-layer co-extrusion two-way stretching THIN COMPOSITE
The preparation method of film, innovation are:
Contain main tensile layer in the laminated film, which is PE, and main tensile layer thickness accounts for laminated film
At least the 30% of overall thickness；
For the laminated film, made in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch
It is standby, specifically: melting for the first time first being synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process and is drawn
It stretches, obtains tubular film, then obtain the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when
Squeeze out film bubble inner layer material temperature at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble
When the temperature of inner layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are carried out pre-
Processing, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength, then, by flat
Film stretching method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm to carry out laterally third time non-melt
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technique is joined
Number and requirement are as follows:
First, synchro-draw multiplying power is 2 ~ 8 in the co-extruding tube embrane method moulding process, and draft temperature is in main stretching layer material
± 0 ~ 10 DEG C on the basis of flow temperature；
Second, the pretreatment is to carry out stress for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing for removing, pretreatment temperature are to reduce 20 ~ 120 DEG C on the basis of draft temperature；
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the heat distortion temperature of the adhesive layer is lower than main drawing
The heat distortion temperature for stretching layer, simultaneously above the brittle temperature of main tensile layer；
4th, non-melt stretch in second of the longitudinal direction uses single-point or multiple spot stretching mode, and stretching ratio is 2 ~ 6, is drawn
Temperature is stretched between the heat distortion temperature and flow temperature of main tensile layer, and close to heat distortion temperature；
5th, in the laterally non-melt stretching of third time, stretching ratio is 4 ~ 10, thermal change of the draft temperature in main tensile layer
Between shape temperature and flow temperature, and close to the flow temperature of main tensile layer；
6th, the post-processing is to carry out stress elimination for the double-deck diaphragm obtained after the laterally non-melt stretching of third time
Processing, post-processing temperature are to increase by 20 ~ 140 DEG C on the basis of laterally third time non-melt draft temperature.
In order to achieve the above objectives, the third technical solution that the present invention uses is: a kind of multi-layer co-extrusion two-way stretching THIN COMPOSITE
The preparation method of film, innovation are:
Contain main tensile layer in the laminated film, which is PP, and main tensile layer thickness accounts for laminated film
At least the 30% of overall thickness；
For the laminated film, made in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch
It is standby, specifically: melting for the first time first being synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process and is drawn
It stretches, obtains tubular film, then obtain the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when
Squeeze out film bubble inner layer material temperature at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble
When the temperature of inner layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are carried out pre-
Processing, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength, then, by flat
Film stretching method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm to carry out laterally third time non-melt
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technique is joined
Number and requirement are as follows:
First, synchro-draw multiplying power is 2 ~ 8 in the co-extruding tube embrane method moulding process, and draft temperature is in main stretching layer material
± 0 ~ 10 DEG C on the basis of melting temperature；
Second, the pretreatment is to carry out stress for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing for removing, pretreatment temperature are to reduce 20 ~ 120 DEG C on the basis of draft temperature；
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the heat distortion temperature of the adhesive layer is lower than main drawing
The heat distortion temperature for stretching layer, simultaneously above the brittle temperature of main tensile layer；
4th, non-melt stretch in second of the longitudinal direction uses multiple spot stretching mode, and stretching ratio is 2 ~ 8, draft temperature
Between the heat distortion temperature and melting temperature of main tensile layer, and close to the heat distortion temperature of main tensile layer；
5th, in the laterally non-melt stretching of third time, stretching ratio is 4 ~ 10, thermal change of the draft temperature in main tensile layer
Between shape temperature and melting temperature, and close to the melting temperature of main tensile layer；
6th, the post-processing be for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time into
Row stress relief treatment, post-processing temperature are to increase by 20 ~ 140 DEG C on the basis of laterally third time non-melt draft temperature.
In order to achieve the above objectives, the 4th technical solution that the present invention uses is: a kind of multi-layer co-extrusion two-way stretching THIN COMPOSITE
The preparation method of film, innovation are:
Contain main tensile layer in the laminated film, which is PA, and main tensile layer thickness accounts for laminated film
At least the 30% of overall thickness；
For the laminated film, made in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch
It is standby, specifically: melting for the first time first being synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process and is drawn
It stretches, obtains tubular film, then obtain the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when
Squeeze out film bubble inner layer material temperature at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble
When the temperature of inner layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are carried out pre-
Processing, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength, then, by flat
Film stretching method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm to carry out laterally third time non-melt
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technique is joined
Number and requirement are as follows:
First, synchro-draw multiplying power is 2 ~ 6 in the co-extruding tube embrane method moulding process, and draft temperature is in main stretching layer material
± 0 ~ 10 DEG C on the basis of melting temperature；
Second, the pretreatment is to carry out stress for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing for removing, pretreatment temperature are to reduce 20 ~ 120 DEG C on the basis of draft temperature；
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the glass transition temperature of the adhesive layer is lower than main drawing
The crystallized temperature for stretching layer, simultaneously above the brittle temperature of main tensile layer；
4th, non-melt stretch in second of the longitudinal direction uses multiple spot stretching mode, and stretching ratio is 2 ~ 5, draft temperature
Lower than the crystallized temperature of main tensile layer；
5th, in the laterally non-melt stretching of third time, stretching ratio is 4 ~ 8, crystallization of the draft temperature in main tensile layer
Change between temperature and maximum crystallization rate temperature, and close to the maximum crystallization rate temperature of main tensile layer；
6th, the post-processing be for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time into
Row stress relief treatment, post-processing temperature are to reduce 20 ~ 140 DEG C on the basis of the melting temperature of main tensile layer.
Related content in above-mentioned technical proposal is explained as follows:
In above scheme, the main tensile layer thickness accounts at least the 30% of laminated film overall thickness.
In above scheme, the pretreated effect is: after periosteum method stretches, the bilayer diaphragm or single layer diaphragm knot
This due to generating thermal stress there are temperature gradient in structure, the temperature difference occurred along film thickness direction is formed by heat and answers
Power is referred to as thickness stress.This thermal stress just can be carried out second of non-melt stretching after must eliminating before flat membrane biaxial tension.
In above scheme, the effect of the post-processing is: second of laminated film is non-melt to be stretched, is non-for the third time molten
Melt the stretching condition of stretching mainly according to the material property and thickness of main tensile layer, therefore exists in complex thin film structure because of difference
Polymeric species under identical stretching condition conformation internal stress, this programme eliminated by post-processing multiple after flat membrane biaxial tension
Close the conformation internal stress in membrane structure.
In above scheme, longitudinal stretching has single-point to stretch and multiple spot stretching, in which: when the sheet for being heated to class rubbery state is
By two different rotating speeds roller stretching when, referred to as single-point stretch；The ratio between the linear velocity of two roller surfaces is exactly draw ratio, is usually existed
Between 1-9, when draw ratio is allocated to the roller of several different rotating speeds to complete, referred to as multiple spot is stretched, these rollers
Revolving speed be it is incremented by successively, total drawing ratio be the last one draw roll (or chill roll) revolving speed and first draw roll (or
Pre- hot-rolling) the ratio between revolving speed.
In above scheme, " glass transition temperature " refers to amorphous or Piezoelectricity from glassy state to elastomeric state
The temperature for starting transformation, is the minimum temperature of amorphous polymer macromolecular chain segment free movement, is amorphous state high molecular material
Intrinsic property, is usually indicated with Tg.More than this temperature, high polymer demonstrates flexibility；In this temperature hereinafter, high polymer shows
Brittleness out.
In above scheme, " heat distortion temperature " refers to applying high molecular material or polymer certain load,
It is heated up with certain speed, the corresponding temperature when reaching regulation deformation.
In above scheme, " flow temperature " i.e. softening temperature refers to that non-crystalline polymer turns from elastomeric state to viscous state
The start temperature of change, is usually indicated with Tf.
In above scheme, the minimum temperature of forced high-elastic deformation can occur when being glassy state for " brittle temperature "；Usually
It is indicated with Tb
It is described " melting temperature " in above scheme, be the fusing point of crystalline polymer, i.e., crystalline polymer melting temperature,
Usually indicated with Tm.
It is described " crystallized temperature " in above scheme, it is the temperature that crystallization takes place in crystalline state high polymer, usually uses Tc table
Show.It is described " maximum crystallization rate temperature " in above scheme, it is temperature when crystallizing optimum growh rate, it is however generally that, glass
Change transition temperature Tg and melting temperature Tm between can crystallize, crystallization optimum growh rate be located at glass transition temperature Tg with
Between melting temperature Tm range, maximum crystallization rate temperature is near 0.8Tm.
In above scheme, " the folding diameter " is referred to: being unit by the perimeter of its die head by the molding film of blow moulding
It is folded, folded length is exactly to roll over diameter, and folding diameter=π d/2, d is the diameter of film forming mouth mold.
In above scheme, " close " the meaning that takes the median of two temperature, when draft temperature is located at median
When between one of temperature, then it is assumed that draft temperature is close to the temperature.
In above scheme, " fusion drawn " refers to being drawn in the state that " dew point " of film bubble is close to fusing point
It stretches；" the non-melt stretching " refers to being stretched under the high-elastic state (non-melt state) of diaphragm；" dew point " again
Claim " frost line ", refers to that plastics are entered the line of demarcation of elastomeric state by viscous state.When dew-point temperature is higher than flow temperature, film
Inflation carries out in the liquid state, and inflation only makes film thining, and molecule is not stretched orientation；When dew point is close to flow temperature
When, the inflation of film carries out in the solid state, makes molecule that horizontal orientation effect occur.
Working principle and advantage of the present invention are: using the synchro-draw of periosteum method in such a way that flat membrane method two-step stretch combines
It is prepared, specifically: first first being carried out to longitudinal and transverse direction by periosteum synchro-draw using co-extruding tube embrane method moulding process
Secondary fusion drawn obtains tubulose film bubble, then the double-deck diaphragm or single layer diaphragm is obtained by tubulose film bubble is flat-folded, then to duplicature
Piece or single layer diaphragm are pre-processed, then are carried out longitudinal second to the double-deck diaphragm or single layer diaphragm simultaneously by Flat film strength
Non-melt stretching, then, by Flat film strength simultaneously to the double-deck diaphragm or list after longitudinal second of non-melt stretching
Tunic piece carries out the laterally non-melt stretching of third time, finally post-processes to the double-deck diaphragm or single layer diaphragm, to obtain double
To stretching laminated film.The energy multi-layer co-extrusion two-way stretching laminated film that uniform thickness is uniform, shrinking percentage is controllable is made.
Specific embodiment
The present invention will be further described below with reference to examples:
Embodiment one:
A kind of preparation method of multi-layer co-extrusion two-way stretching laminated film contains main tensile layer in the laminated film, should
Main stretching layer material is PET, and main tensile layer thickness accounts for the 38% of laminated film overall thickness.
For the laminated film, made in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch
It is standby, specifically: melting for the first time first being synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process and is drawn
It stretches, obtains tubular film, then obtain the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when
Squeeze out film bubble inner layer material temperature at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble
When the temperature of inner layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are carried out pre-
Processing, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength, then, by flat
Film stretching method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm to carry out laterally third time non-melt
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technique is joined
Number and requirement are as follows:
First, the multiplying power of synchro-draw is 4 in the co-extruding tube embrane method moulding process, 265 DEG C of draft temperature, wherein main
The glass transition temperature for stretching layer material is 69 DEG C, and melting temperature is 270 DEG C.
Second, the pretreatment is to carry out stress for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Annealing is eliminated, 240 DEG C of pretreatment temperature, pretreatment temperature is to reduce 25 on the basis of first time fusion drawn temperature
℃。
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the glass transition temperature of the adhesive layer is lower than main drawing
The glass transition temperature for stretching layer, simultaneously above the brittle temperature of main tensile layer.
4th, non-melt stretch in second of the longitudinal direction uses single-point stretching mode, stretching ratio 3, and draft temperature is
86 DEG C, between the glass transition temperature and melting temperature of main tensile layer, and close to the glass transition temperature of main tensile layer.
5th, in the laterally non-melt stretching of third time, stretching ratio 4, draft temperature is 170 DEG C, in main tensile layer
Glass transition temperature and melting temperature between, and close to melting temperature.
6th, the post-processing be for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time into
Row stress relief treatment, post-processing temperature are 238 DEG C, and annealing temperature is on the basis of the laterally non-melt draft temperature of third time
On, increase by 68 DEG C.
Embodiment two:
A kind of preparation method of multi-layer co-extrusion two-way stretching laminated film contains main tensile layer in the laminated film, should
Main stretching layer material is PE, and main tensile layer thickness accounts for the 50% of laminated film overall thickness.
For the laminated film, made in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch
It is standby, specifically: melting for the first time first being synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process and is drawn
It stretches, obtains tubular film, then obtain the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when
Squeeze out film bubble inner layer material temperature at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble
When the temperature of inner layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are carried out pre-
Processing, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength, then, by flat
Film stretching method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm to carry out laterally third time non-melt
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technique is joined
Number and requirement are as follows:
First, synchro-draw multiplying power is 8 in the co-extruding tube embrane method moulding process, and draft temperature is 140 DEG C, wherein PE
Heat distortion temperature be 85 DEG C, flow temperature be 130 DEG C.
Second, the pretreatment is to carry out stress for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing for removing, 120 DEG C of annealing temperature, pretreatment temperature is to reduce 20 DEG C on the basis of first time fusion drawn temperature.
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the heat distortion temperature of the adhesive layer is lower than main drawing
The heat distortion temperature for stretching layer, simultaneously above the brittle temperature of main tensile layer.
4th, non-melt stretch in second of the longitudinal direction uses 2 stretching modes, stretching ratio 6, first point of stretching
Temperature is 100 DEG C ~ 105 DEG C, and second point draft temperature is 105 DEG C ~ 110 DEG C, in the heat distortion temperature and viscosity flow temperature of main tensile layer
Between degree, and close to heat distortion temperature.
5th, in the laterally non-melt stretching of third time, stretching ratio 6, draft temperature is 120 DEG C, in main tensile layer
Heat distortion temperature and flow temperature between, and close to flow temperature.
6th, the post-processing be for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time into
Row stress relief treatment, 160 DEG C of post-processing temperature, be to increase by 40 DEG C on the basis of laterally third time non-melt draft temperature.
Embodiment three:
A kind of preparation method of multi-layer co-extrusion two-way stretching laminated film contains main tensile layer in the laminated film, should
Main stretching layer material is PP, and main tensile layer thickness accounts for the 45% of laminated film overall thickness.
For the laminated film, made in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch
It is standby, specifically: melting for the first time first being synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process and is drawn
It stretches, obtains tubular film, then obtain the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when
Squeeze out film bubble inner layer material temperature at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble
When the temperature of inner layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are carried out pre-
Processing, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength, then, by flat
Film stretching method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm to carry out laterally third time non-melt
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technique is joined
Number and requirement are as follows:
First, synchro-draw multiplying power is 6 in the co-extruding tube embrane method moulding process, and draft temperature is 180 DEG C, main tensile layer
93 DEG C of the heat distortion temperature of material PP, melting temperature are 185 DEG C.
Second, the pretreatment is to carry out stress for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing for removing, it is to reduce 25 DEG C on the basis of draft temperature that pretreatment temperature, which is 155 DEG C,.
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the glass transition temperature of the adhesive layer is lower than main drawing
The heat distortion temperature temperature for stretching layer, simultaneously above the brittle temperature of main tensile layer.
4th, non-melt stretch in second of the longitudinal direction uses two o'clock stretching mode, stretching ratio 6, first point of stretching
Temperature is that 100 DEG C ~ 110 DEG C second point draft temperatures are 110 DEG C ~ 126 DEG C, in the heat distortion temperature and melting temperature of main tensile layer
Between, and close to the heat distortion temperature of main tensile layer.
5th, in the laterally non-melt stretching of third time, 158 DEG C of draft temperature heat distortion temperatures in main tensile layer and molten
Melt between temperature (Tm), and close to the melting temperature of main tensile layer；
6th, the post-processing be for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time into
Row stress relief treatment, post-processing temperature are 198 DEG C, are to increase by 40 on the basis of laterally third time non-melt draft temperature
℃。
Example IV:
A kind of preparation method of multi-layer co-extrusion two-way stretching laminated film contains main tensile layer in the laminated film, should
Main stretching layer material is PA, and main tensile layer thickness accounts for the 30% of laminated film overall thickness.
For the laminated film, made in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch
It is standby, specifically: melting for the first time first being synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process and is drawn
It stretches, obtains tubular film, then obtain the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when
Squeeze out film bubble inner layer material temperature at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble
When the temperature of inner layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are carried out pre-
Processing, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength, then, by flat
Film stretching method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm to carry out laterally third time non-melt
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technique is joined
Number and requirement are as follows:
First, synchro-draw multiplying power is 2.5 in the co-extruding tube embrane method moulding process, and draft temperature is 230 DEG C, main stretching
The crystallization onset temperature of layer material PA is 85 DEG C, and maximum crystallization rate temperature is 168 DEG C, and melting temperature is 220 DEG C.
Second, the pretreatment is to carry out stress for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing for removing, it is to reduce 50 DEG C on the basis of draft temperature that pretreatment temperature, which is 180 DEG C,.
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the glass transition temperature of the adhesive layer is higher than main drawing
Stretch the brittle temperature of layer.
4th, non-melt stretch in second of the longitudinal direction uses two o'clock stretching mode, stretching ratio 3, first point of stretching
Temperature is 65 ~ 70 DEG C, and second point draft temperature is 70 ~ 80 DEG C (lower than the crystallized temperature of main tensile layer).
5th, in the laterally non-melt stretching of third time, stretching ratio 4, draft temperature is 130 DEG C, and draft temperature exists
Between the crystallized temperature of main tensile layer and maximum crystallization rate temperature, and close to the maximum crystallization rate temperature of main tensile layer.
6th, the post-processing be for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time into
Row stress relief treatment, it is to increase by 80 on the basis of laterally third time non-melt draft temperature that post-processing temperature, which is 210 DEG C,
℃。
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of preparation method of multi-layer co-extrusion two-way stretching laminated film, it is characterised in that:
Contain main tensile layer in the laminated film, which is PET, and main tensile layer thickness accounts for laminated film total thickness
At least the 30% of degree；
For the laminated film, prepared in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch,
Specifically: first time fusion drawn is first synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process,
Tubular film is obtained, then obtains the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when squeezing
Out the temperature of film bubble inner layer material at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble in
When the temperature of layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are located in advance
Reason, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength and then passes through flat membrane
Pulling method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm carry out the laterally non-melt drawing of third time
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technological parameter
With require it is as follows:
First, synchro-draw multiplying power is 2 ~ 8 in the co-extruding tube embrane method moulding process, and draft temperature is in main tensile layer material molten
± 0 ~ 10 DEG C on the basis of temperature；
Second, the pretreatment is to carry out stress elimination for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing, treatment temperature are to reduce 20 ~ 120 DEG C on the basis of draft temperature；
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the glass transition temperature of the adhesive layer is lower than main tensile layer
Glass transition temperature, simultaneously above the brittle temperature of main tensile layer；
4th, non-melt stretch in second of the longitudinal direction uses single-point or multiple spot stretching mode, and stretching ratio is 2 ~ 4.5, is stretched
Temperature is between the glass transition temperature and melting temperature of main tensile layer, and the glass transition temperature of close main tensile layer；
5th, in the laterally non-melt stretching of third time, stretching ratio is 2 ~ 4.5, vitrifying of the draft temperature in main tensile layer
Between temperature and melting temperature, and close to the melting temperature of main tensile layer；
6th, the post-processing is answered for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time
Power Processing for removing, post-processing temperature are to increase by 20 ~ 140 DEG C on the basis of laterally third time non-melt draft temperature.
2. a kind of preparation method of multi-layer co-extrusion two-way stretching laminated film, it is characterised in that:
Contain main tensile layer in the laminated film, which is PE, and main tensile layer thickness accounts for laminated film total thickness
At least the 30% of degree；
For the laminated film, prepared in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch,
Specifically: first time fusion drawn is first synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process,
Tubular film is obtained, then obtains the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when squeezing
Out the temperature of film bubble inner layer material at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble in
When the temperature of layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are located in advance
Reason, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength and then passes through flat membrane
Pulling method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm carry out the laterally non-melt drawing of third time
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technological parameter
With require it is as follows:
First, synchro-draw multiplying power is 2 ~ 8 in the co-extruding tube embrane method moulding process, and draft temperature is in main stretching layer material viscosity flow
± 0 ~ 10 DEG C on the basis of temperature；
Second, the pretreatment is to carry out stress elimination for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing, pretreatment temperature are to reduce 20 ~ 120 DEG C on the basis of draft temperature；
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the heat distortion temperature of the adhesive layer is lower than main tensile layer
Heat distortion temperature, simultaneously above the brittle temperature of main tensile layer；
4th, non-melt stretch in second of the longitudinal direction uses single-point or multiple spot stretching mode, and stretching ratio is 2 ~ 6, stretches temperature
Degree is between the heat distortion temperature and flow temperature of main tensile layer, and close heat distortion temperature；
5th, in the laterally non-melt stretching of third time, stretching ratio is 4 ~ 10, thermal deformation temperature of the draft temperature in main tensile layer
Between degree and flow temperature, and close to the flow temperature of main tensile layer；
6th, the post-processing is answered for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time
Power Processing for removing, post-processing temperature are to increase by 20 ~ 140 DEG C on the basis of laterally third time non-melt draft temperature.
3. a kind of preparation method of multi-layer co-extrusion two-way stretching laminated film, it is characterised in that:
Contain main tensile layer in the laminated film, which is PP, and main tensile layer thickness accounts for laminated film total thickness
At least the 30% of degree；
For the laminated film, prepared in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch,
Specifically: first time fusion drawn is first synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process,
Tubular film is obtained, then obtains the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when squeezing
Out the temperature of film bubble inner layer material at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble in
When the temperature of layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are located in advance
Reason, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength and then passes through flat membrane
Pulling method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm carry out the laterally non-melt drawing of third time
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technological parameter
With require it is as follows:
First, synchro-draw multiplying power is 2 ~ 8 in the co-extruding tube embrane method moulding process, and draft temperature is in main tensile layer material molten
± 0 ~ 10 DEG C on the basis of temperature；
Second, the pretreatment is to carry out stress elimination for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing, pretreatment temperature are to reduce 20 ~ 120 DEG C on the basis of draft temperature；
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the heat distortion temperature of the adhesive layer is lower than main tensile layer
Heat distortion temperature, simultaneously above the brittle temperature of main tensile layer；
4th, non-melt stretch in second of the longitudinal direction uses multiple spot stretching mode, and stretching ratio is 2 ~ 8, and draft temperature is in master
Between the heat distortion temperature and melting temperature of tensile layer, and close to the heat distortion temperature of main tensile layer；
5th, in the laterally non-melt stretching of third time, stretching ratio is 4 ~ 10, thermal deformation temperature of the draft temperature in main tensile layer
Between degree and melting temperature, and close to the melting temperature of main tensile layer；
6th, the post-processing is answered for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time
Power Processing for removing, post-processing temperature are to increase by 20 ~ 140 DEG C on the basis of laterally third time non-melt draft temperature.
4. a kind of preparation method of multi-layer co-extrusion two-way stretching laminated film, it is characterised in that:
Contain main tensile layer in the laminated film, which is PA, and main tensile layer thickness accounts for laminated film total thickness
At least the 30% of degree；
For the laminated film, prepared in such a way that the synchro-draw of periosteum method is combined with flat membrane method two-step stretch,
Specifically: first time fusion drawn is first synchronized to the longitudinal and transverse direction for squeezing out film bubble using co-extruding tube embrane method moulding process,
Tubular film is obtained, then obtains the double-deck diaphragm or single layer diaphragm for tubular film is flat-folded, wherein under flat-folded state, when squeezing
Out the temperature of film bubble inner layer material at or below the material glass transition temperature when, obtain the double-deck diaphragm, when squeeze out film bubble in
When the temperature of layer material is higher than the fusing point of the material, single layer diaphragm is obtained；Then the double-deck diaphragm or single layer diaphragm are located in advance
Reason, then longitudinal second of non-melt stretching is carried out to the double-deck diaphragm or single layer diaphragm by Flat film strength and then passes through flat membrane
Pulling method to after longitudinal second of non-melt stretching the double-deck diaphragm or single layer diaphragm carry out the laterally non-melt drawing of third time
It stretches, finally the double-deck diaphragm or single layer diaphragm is post-processed, to obtain biaxial tension laminated film；Wherein, technological parameter
With require it is as follows:
First, synchro-draw multiplying power is 2 ~ 6 in the co-extruding tube embrane method moulding process, and draft temperature is in main tensile layer material molten
± 0 ~ 10 DEG C on the basis of temperature；
Second, the pretreatment is to carry out stress elimination for the double-deck diaphragm or single layer diaphragm obtained after first time fusion drawn
Processing, pretreatment temperature are to reduce 20 ~ 120 DEG C on the basis of draft temperature；
Third, is equipped with adhesive layer between the main tensile layer and adjacent layer, the glass transition temperature of the adhesive layer is lower than main tensile layer
Crystallized temperature, simultaneously above the brittle temperature of main tensile layer；
4th, non-melt stretch in second of the longitudinal direction uses multiple spot stretching mode, and stretching ratio is 2 ~ 5, and draft temperature is lower than
The crystallized temperature of main tensile layer；
5th, in the laterally non-melt stretching of third time, stretching ratio is 4 ~ 8, crystallization temperature of the draft temperature in main tensile layer
Between degree and maximum crystallization rate temperature, and close to the maximum crystallization rate temperature of main tensile layer；
6th, the post-processing is answered for the double-deck diaphragm or single layer diaphragm obtained after the laterally non-melt stretching of third time
Power Processing for removing, post-processing temperature are to reduce 20 ~ 140 DEG C on the basis of the melting temperature of main tensile layer.
5. the preparation method of multi-layer co-extrusion two-way stretching laminated film according to claim 1 or 2 or 3 or 4, feature exist
In: the main tensile layer thickness accounts for the 30 ~ 60% of laminated film overall thickness.
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