CN110920183A - Preparation method of white polyester heat-shrinkable label film - Google Patents
Preparation method of white polyester heat-shrinkable label film Download PDFInfo
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- CN110920183A CN110920183A CN201911226254.4A CN201911226254A CN110920183A CN 110920183 A CN110920183 A CN 110920183A CN 201911226254 A CN201911226254 A CN 201911226254A CN 110920183 A CN110920183 A CN 110920183A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/285—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyethers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/21—Anti-static
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/418—Refractive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/72—Density
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2519/00—Labels, badges
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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Abstract
The invention belongs to the field of plastic film processing, and particularly relates to a preparation method of a white polyester heat-shrinkable label film. The invention solves the problem of density increase caused by titanium dioxide in the existing white film preparation process, effectively reduces the transparency of the blend film by utilizing the birefringence phenomenon of PE crystals and the difference of the light refractive index between PE and PETG, enables the film to be milky white, abandons the use of titanium dioxide, and has no influence caused by titanium dioxide.
Description
Technical Field
The invention belongs to the field of plastic film processing, and particularly relates to a preparation method of a white polyester heat-shrinkable label film.
Background
The heat-shrinkable label film is a label base material for PET bottled drinks and the like, and the currently used materials mainly comprise PVC, PS, PETG and the like. Because PETG is more environment-friendly than PVC, compared with PS, the shrinkage rate of PETG has better normal-temperature retentivity, and the PETG is convenient for storage and transportation of products; the printing applicability is better. Therefore, polyester PETG is becoming an important material and mainstream product development direction for shrink label films today.
The heat-shrinkable label film is printed to have a fine pattern and color, and then is converted into a label product. The printing of the heat shrinkable label film is currently basically carried out by adopting a multi-color set gravure printing mode. In order to highlight the beautiful and pure colors and the vivid effect of patterns, some label films are firstly subjected to priming coating during printing, namely a layer of white ink is printed firstly. If make white product with the label film, just can save this process of primary coat during its printing, directly carry out the color printing, can improve printing efficiency by a wide margin like this to guarantee printing effect that can be better, still can increase the chromatography variety of printing product simultaneously. By adopting white film printing, the environmental pollution in the label film printing process can be properly reduced due to the fact that one primary coating printing process can be omitted.
The polyester PETG heat-shrinkable label film is processed and produced by adopting a flat film method, namely a casting stretching film-making process, and mostly takes a transparent film as a main material. At present, a small amount of white PETG heat-shrinkable label film products are also available, and the film is made into a white product mainly by adding a white pigment-titanium dioxide (titanium dioxide) coloring mode or a method of changing light transmittance and mode through micro-foaming.
By adding titanium dioxide, white film products with different light transmittance and covering power can be obtained by adjusting the adding amount of the titanium dioxide, and the effect of the white film products is closer to that of the base coat. However, the addition of titanium dioxide can increase the density of the film, and more importantly, the titanium dioxide can aggravate the mechanical abrasion of film forming and processing equipment and greatly reduce the service life of the equipment. The life defect can be reduced as much as possible only by technical means and cannot be thoroughly overcome.
Foamed white heat-shrinkable label film products, such as shrink label films made using eastman EmbyaceTMHY copolyester, change the light transmittance and refraction and scattering directions through low foaming in the film, thereby achieving a "white" effect. The film can also effectively reduce the film density through foaming. But the raw material price is higher, and the mechanical property of the film is reduced compared with that of the common transparent label film product. What is important is that the stiffness of the film is reduced and the finished label needs to be produced at reduced production speed or ensured by adding corresponding auxiliary facilities in the automatic labeling process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a preparation method of a white polyester heat-shrinkable label film, which solves the problem of density increase caused by titanium dioxide in the existing white film preparation process, effectively reduces the transparency of a blend film by utilizing the birefringence phenomenon of PE crystals and the difference of the light refractive index between PE and PETG, enables the film to be milky, abandons the use of titanium dioxide, and does not have the influence caused by titanium dioxide.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a preparation method of a white polyester heat-shrinkable label film adopts a three-layer co-extrusion structure and comprises an upper surface layer, a lower surface layer and a core layer, wherein the upper surface layer and the lower surface layer use PETG, PE, SEBS and PEG as raw materials, and the core layer uses PETG, PE and SEBS as raw materials.
The thickness ratio of the upper surface to the core layer to the lower surface layer is 10-15: 70-80: 10-15.
The mass ratio of each material in the core layer is as follows: PETG PE SEBS 77-88 10-20: 2-3.
The upper surface and the lower surface layer have the same composition, and the mass ratio of the materials is as follows:
PETG:PE:SEBS:PEG＝81.8-87.2:10-15:2:0.8-1.2。
the label film comprises the following steps:
step 1, adding PETG, PE, SEBS and PEG into an extruder according to a proportion for plasticizing, and then introducing a filter for filtering to obtain a surface layer melt;
step 2, adding PETG, PE and SEBS into an extruder according to a proportion for plasticizing, and then introducing a filter for filtering to obtain a core layer melt;
step 3, compounding an upper surface layer, a core layer and a lower surface layer of the surface layer melt and the core layer melt in a melt distributor, and carrying out tape casting through a die head to obtain a prefabricated film;
and 4, carrying out quenching roller casting treatment, transverse stretching treatment, traction, rolling, slitting inspection and packaging on the prefabricated film to obtain the label film.
The mass ratio of PETG, PE, SEBS and PEG in the step 1 is 81.8-87.2:10-15:2: 0.8-1.2.
The mass ratio of PETG, PE and SEBS in the step 2 is 77-88:10-20: 2-3.
PETG can be selected from: korean SK company S2008, K2012; embrace of Eastman corporation of AmericaTMCopolyester, EmbraceTMLV copolyester, GN001, 6763; HSF in Shanghai.
The PE polyethylene can be selected from film grade LLDPE, LDPE, HDPE and metallocene polyethylene products, the melt flow rate is within the range of 1.0-2.0g/10min, and the opening agent is not contained. Such as 7042, 3324, 1801, DFDC9060, 9020 and the like of LLDPE; LD104, LD100, 951-000, 868-000, 951-050, 2420H, Q200, N150 and the like of LDPE; 3300F for HDPE, TR550, etc.; metallocene polyethylene 1018HA, 1327HA, 2018HA, 5400G, 5401G, 5500G, and the like.
SEBS can be selected from American Keteng FG1702, FG 1901; rubber SEBS6150, 6152; ENICHEM2311, 2312, etc.
Polyethylene glycol PEG-2000, such as Jiangsu Haian petrochemical plant.
The invention blends PETG and PE, and utilizes the birefringence of PE crystal and the difference of light refractive index between PE (LLDPE and LDPE have refractive indexes of 1.51 and HDPE has refractive index of 1.54) and PETG (PETG has refractive index of 1.57), so as to effectively reduce the transparency of the blend film and make the film show milk white color. The blending of PE can also effectively increase the toughness of the film, improve the hand feeling of the label and reduce the density of the film. PEG has good antistatic property and smoothness, the whiteness of the film can be further improved by utilizing the refractive index difference among various materials (PETG, PE and PEG) when the PEG is added into the surface layer, good opening property and antistatic property can be given to the polyester heat-shrinkable label film, the film becomes a full organic matter component, the abrasion of inorganic additives to machinery in the process of processing and using the heat-shrinkable label film is reduced, the surfaces of the film and the label cover are smoother, and the hand feeling is better.
The PE crystals can be uniformly dispersed in the PETG in a blending mode, the internal PET crystals can be induced, the number of the crystals in the PE and PETG blending material is greatly increased, meanwhile, the effect of changing the transparency is achieved by utilizing the difference of the refractive indexes of the PET crystals and the PE crystals in the crystals, and the whiteness is greatly increased.
PEG is dissolved in the surface layer, has good lubricating and antistatic effects, and can endow the film with good openness and antistatic properties by being added into the surface layer of the heat-shrinkable label film, so that the hand feeling of the film and the manufactured label is improved. Meanwhile, the refractive index of PEG is different from that of PETG and PE, and further transparency reduction can be realized.
PETG is a modified product of PET, and the basic physical properties of the PETG are consistent with those of PET. PET belongs to polar polymer, solubility parameter value is big delta 10.7, PE belongs to non-polar polymer, solubility parameter value is small delta 7.9, and the solubility parameters are different greatly and are not compatible with each other. In order to better ensure the performance and quality of the blended film, a compatilizer SEBS (styrene/ethylene/butadiene/styrene copolymer) is added into the PET/PE blended material, and the compatilizer SEBS plays a role of a surfactant at a phase interface of PET/PE, so that the interfacial tension is reduced, the interfacial bonding strength is increased, the size of a disperse phase is reduced, and the compatibility of a blending system is improved.
SEBS (styrene/ethylene/butadiene/styrene copolymer) with a molecular configuration of A-B-A triblock copolymer, wherein A is a hard plastic block PS, and B is an ethylene/butylene (EB) elastomer block. The EB block and the PE block in the SEBS are similar, and the EB block and the PE block have good compatibility. Although SEBS does not have chain segments which are the same as or similar to PET, the SEBS and the PET do not have compatibility, but have the same structure and polarity as the modified chain segments 1, 4-cyclohexane dimethyl in PETG, so that the SEBS and the PETG have certain compatibility. In addition, the solubility parameter of SEBS is between 7.2 and 9.6, which is between PETG and PE, and SEBS has the function of promoting the compatibility of PETG/PE blends according to the judgment rule of one of thermodynamics of polymer blend compatibility that the closer the polymer solubility parameter is, the better the compatibility is. In addition, the SEBS has a low melting temperature, and is changed into liquid at a processing temperature of the PETG/PE blend, and the liquid is dispersed on a phase boundary interface of the PETG and the PE blend to play a role of a surfactant, reduce the interfacial tension, increase the interfacial bonding strength and reduce the size of a dispersed phase, so that the compatibility of a blending system is improved.
The main raw materials PETG, PE and SEBS between the core layer and the surface layer are basically the same in composition, the mixture ratio has certain difference, but the difference is not large, the whole body belongs to a similar blend, the melt interface performance between the core layer and the surface layer is converged, and the melt interfaces have no problem. A small amount of PEG is added in the surface layer to improve the opening property and antistatic property of the surface of the film. The auxiliary agent mainly shows that PEG is precipitated on the surface of the film after the film is cooled and formed, so that the surface structure and performance of the film are changed, and the smoothness effect is exerted. The core layer and the surface layer are compounded and formed in a melt state, and three layers of high-temperature melt are combined into a whole in a distributor. PEG is in a liquid state at a high temperature, is dissolved in the melt and is not separated out to the surface, and the influence on the interface performance and interlayer fusion of the melt is not generated in principle. Moreover, the whole addition amount of PEG is limited, and even a small amount of PEG appears on a melt interface, the fusion of the interface of the core layer and the surface layer cannot be adversely affected.
Core layer and top layer all constitute with PETG, PE, SEBS, can form good compatibility in the fuse-element film forming process, promote the cohesiveness on core layer and top layer, have the difference on the ratio between core layer and the top layer simultaneously to and still add PEG in the top layer, can ensure that the light refracting index of top layer and core layer forms the difference, thereby the top layer forms the white membranization with the core layer, reaches the effect of whole white membrane.
From the above description, it can be seen that the present invention has the following advantages:
1. the invention solves the problem of density increase caused by titanium dioxide in the existing white film preparation process, effectively reduces the transparency of the blend film by utilizing the birefringence phenomenon of PE crystals and the difference of the light refractive index between PE and PETG, enables the film to be milky white, abandons the use of titanium dioxide, and has no influence caused by titanium dioxide.
2. The invention utilizes PE as a nucleating agent for PETG crystallization, not only can form PE crystals, but also can induce the formation of the crystals in PETG, ensures the uniform dispersion of the PE crystals and the PET crystals in the blend, achieves the effect of reducing the transparency, and the film is white.
Detailed Description
The present invention is described in detail with reference to examples, but the present invention is not limited to the claims.
White polyester heat-shrinkable label film
Film structure and layer composition: the label film has a three-layer co-extrusion structure, wherein the upper layer and the lower layer are surface layers, the composition is the same, raw material melt is supplied by one extruder, the middle layer is a core layer, and the melt is supplied by the other extruder through plastic extrusion.
The thickness ratio of the middle layer to the surface layer is 10-15/70-80/10-15.
Raw materials of the middle layer: PETG, PE and SEBS are mixed according to the following proportion (in parts by mass):
PETG:PE:SEBS＝77-88:10-20:2-3；
surface layer raw materials: PETG, PE, SEBS and PEG, wherein the mixture ratio (parts by mass) is as follows:
PETG:PE:SEBS:PEG＝81.8-87.2:10-15:2:0.8-1.2。
process flow and apparatus
The invention adopts a conventional production line for three-layer co-extrusion of a flat-film polyester heat-shrinkable label film to process and produce a white heat-shrinkable label film product. No modification and perfection of the production equipment is required.
The process flow is as follows:
(core layer) raw materials → conveying and metering → extruder plasticizing → metering pump metering → filter;
(surface layer) raw materials → conveying and metering → extruder plasticizing → metering pump and metering → filter;
obtaining surface layer melt and core layer melt → melt distributor → T type die head casting → quenching roller casting → longitudinal stretching → transverse stretching → drawing → rolling → cutting → checking → packaging → finished product.
Since the heat-shrinkable label film is a transverse unidirectional shrinkable film, when the heat-shrinkable label film is produced by a flat film method, it can be produced by directly stretching a sheet in the transverse direction without using a longitudinal stretching step. If a longitudinal stretching process is adopted, the longitudinal stretching multiple is selected to be small and is generally within 1:1.20, otherwise, the longitudinal shrinkage rate of the film is large.
Thus, the embodiment does not have longitudinal stretching after the chill roll casting process.
Main equipment configuration
(1) A raw material system: storage bin 20m3X 3; and the vector metering device 6 is arranged.
(2) An extruder: a core layer extruder and parallel double screws, wherein the diameter of each screw is 92mm, the length-diameter ratio is 40:1, and the rated extrusion capacity is 720 kg/h; the surface layer extruder is a parallel double screw, the diameter of the screw is 65mm, the length-diameter ratio is 40:1, and the rated extrusion capacity is 380 kg/h.
(3) A metering pump: core layer extruder matching, two gears positive displacement type, capacity 300cm3(ii) rpm; the surface layer extruder is matched, and the capacity of the extruder is 126cm3/rpm。
(4) Die head: the width of a die lip is 960mm, the opening of the die lip is 1.0-3.0, and 40 adjusting bolts are arranged.
(5) Casting sheet cooling drum: the diameter phi is 1500mm, the width of the roller surface is 1160mm, the surface smoothness is Ra0.025, and the temperature control precision of the roller surface is +/-1 ℃.
(6) And (3) transverse stretching: the stretching area is arranged, and the preheating section is 3 sections, the stretching section is 3 sections, the shaping section is 4 sections, and the cooling section is 2 sections; stretching ratio 1: 4-1: 6.
(7) traction: and 7 drawing rolls with the diameter of 350 mm.
(8) Winding: and the double-station contact and gap winding machine has the winding width of 4200mm and the winding diameter of 1000 mm.
3) Main process parameters
Plasticizing temperature of the extruder: 240 ℃ 265 DEG C
Die temperature: 262 ℃ 268 DEG C
Water inlet temperature of the cast piece cold drum: 26 deg.C
The electrostatic adsorption device is arranged at a high voltage: 8.2KV
Setting the temperature of a transverse stretching zone:
the temperature of the preheating zone is 96-120 DEG C
The temperature of the stretching area is 85-95 DEG C
The temperature of the setting area is 65-80 DEG C
The temperature of the cooling zone is 40-45 DEG C
Transverse stretching ratio: 1:5.2
Selection of raw materials:
PETG can be selected from: korean SK company S2008, K2012; embrace of Eastman corporation of AmericaTMCopolyester, EmbraceTMLV copolyester, GN001, 6763; HSF in Shanghai.
The PE polyethylene can be selected from film grade LLDPE, LDPE, HDPE and metallocene polyethylene products, the melt flow rate is within the range of 1.0-2.0g/10min, and the opening agent is not contained. Such as 7042, 3324, 1801, DFDC9060, 9020 and the like of LLDPE; LD104, LD100, 951-000, 868-000, 951-050, 2420H, Q200, N150 and the like of LDPE; 3300F for HDPE, TR550, etc.; metallocene polyethylene 1018HA, 1327HA, 2018HA, 5400G, 5401G, 5500G, and the like.
SEBS can be selected from American Keteng FG1702, FG 1901; rubber SEBS6150, 6152; ENICHEM2311, 2312, etc.
Polyethylene glycol PEG-2000, such as Jiangsu Haian petrochemical plant.
Example 1
A white polyester heat shrinkable label film:
film trilayer ratio 10/80/10
The middle layer comprises the following components in parts by mass: PETG PE SEBS 83:15:2
The surface layer comprises the following components in parts by mass: PETG PE SEBS PEG 87:10:2.0:1.0
PETG is HSF; the PE is 7042; SEBS is 6152, PEG is PEG-2000.
(1) A raw material system: storage bin 20m3X 3; and the vector metering device 6 is arranged.
(2) An extruder: a core layer extruder and parallel double screws, wherein the diameter of each screw is 92mm, the length-diameter ratio is 40:1, and the rated extrusion capacity is 720 kg/h; the surface layer extruder is a parallel double screw, the diameter of the screw is 65mm, the length-diameter ratio is 40:1, and the rated extrusion capacity is 380 kg/h.
(3) A metering pump: core layer extruder matching, two gears positive displacement type, capacity 300cm3(ii) rpm; the surface layer extruder is matched, and the capacity of the extruder is 126cm3/rpm。
(4) Die head: the width of a die lip is 960mm, the opening of the die lip is 1.0-3.0, and 40 adjusting bolts are arranged.
(5) Casting sheet cooling drum: the diameter phi is 1500mm, the width of the roller surface is 1160mm, the surface smoothness is Ra0.025, and the temperature control precision of the roller surface is +/-1 ℃.
(6) And (3) transverse stretching: the stretching area is arranged, and the preheating section is 3 sections, the stretching section is 3 sections, the shaping section is 4 sections, and the cooling section is 2 sections; stretching ratio 1: 4.
(7) traction: and 7 drawing rolls with the diameter of 350 mm.
(8) Winding: and the double-station contact and gap winding machine has the winding width of 4200mm and the winding diameter of 1000 mm.
3) Main process parameters
Plasticizing temperature of the extruder: 240 ℃ C
Die temperature: 262 deg.C
Water inlet temperature of the cast piece cold drum: 26 deg.C
The electrostatic adsorption device is arranged at a high voltage: 8.2KV
Setting the temperature of a transverse stretching zone:
the temperature of the preheating zone is 96 DEG C
The temperature of the stretching zone is 85 DEG C
The temperature of the setting area is 65 DEG C
The temperature of the cooling zone is 40 DEG C
Transverse stretching ratio: 1:5.2
Example 2
A white polyester heat shrinkable label film:
film trilayer ratio 15/70/15
The middle layer comprises the following components in parts by mass: PETG PE SEBS 77 SEBS 20:3
The surface layer comprises the following components in parts by mass: PETG PE SEBS PEG 87:10:2.0:1.0
PETG is HSF; PE is 9060; SEBS is 1702, PEG is PEG-2000.
(1) A raw material system: storage bin 20m3X 3; and the vector metering device 6 is arranged.
(2) An extruder: a core layer extruder and parallel double screws, wherein the diameter of each screw is 92mm, the length-diameter ratio is 40:1, and the rated extrusion capacity is 720 kg/h; the surface layer extruder is a parallel double screw, the diameter of the screw is 65mm, the length-diameter ratio is 40:1, and the rated extrusion capacity is 380 kg/h.
(3) A metering pump: core layer extruder matching, two gears positive displacement type, capacity 300cm3(ii) rpm; the surface layer extruder is matched, and the capacity of the extruder is 126cm3/rpm。
(4) Die head: the width of a die lip is 960mm, the opening of the die lip is 1.0-3.0, and 40 adjusting bolts are arranged.
(5) Casting sheet cooling drum: the diameter phi is 1500mm, the width of the roller surface is 1160mm, the surface smoothness is Ra0.025, and the temperature control precision of the roller surface is +/-1 ℃.
(6) And (3) transverse stretching: the stretching area is arranged, and the preheating section is 3 sections, the stretching section is 3 sections, the shaping section is 4 sections, and the cooling section is 2 sections; stretching ratio 1: 6.
(7) traction: and 7 drawing rolls with the diameter of 350 mm.
(8) Winding: and the double-station contact and gap winding machine has the winding width of 4200mm and the winding diameter of 1000 mm.
3) Main process parameters
Plasticizing temperature of the extruder: 265 deg.C
Die temperature: 268 deg.C
Water inlet temperature of the cast piece cold drum: 26 deg.C
The electrostatic adsorption device is arranged at a high voltage: 8.2KV
Setting the temperature of a transverse stretching zone:
the temperature of the preheating zone was 120 deg.C
The temperature of the stretching zone was 95 deg.C
The temperature of the setting area is 80 DEG C
The temperature of the cooling zone was 45 deg.C
Transverse stretching ratio: 1:5.2
Example 3
A white polyester heat shrinkable label film:
film trilayer ratio 10/80/10
The middle layer comprises the following components in parts by mass: PETG PE SEBS 77 SEBS 20:3
The surface layer comprises the following components in parts by mass: PETG PE SEBS PEG 81.8:15:2.0:1.2
PETG is S2008; PE is 1801; SEBS is 1702, PEG is PEG-2000.
(1) A raw material system: storage bin 20m3X 3; and the vector metering device 6 is arranged.
(2) An extruder: a core layer extruder and parallel double screws, wherein the diameter of each screw is 92mm, the length-diameter ratio is 40:1, and the rated extrusion capacity is 720 kg/h; the surface layer extruder is a parallel double screw, the diameter of the screw is 65mm, the length-diameter ratio is 40:1, and the rated extrusion capacity is 380 kg/h.
(3) A metering pump: core layer extruder matching, two gears positive displacement type, capacity 300cm3(ii) rpm; the surface layer extruder is matched, and the capacity of the extruder is 126cm3/rpm。
(4) Die head: the width of a die lip is 960mm, the opening of the die lip is 1.0-3.0, and 40 adjusting bolts are arranged.
(5) Casting sheet cooling drum: the diameter phi is 1500mm, the width of the roller surface is 1160mm, the surface smoothness is Ra0.025, and the temperature control precision of the roller surface is +/-1 ℃.
(6) And (3) transverse stretching: the stretching area is arranged, and the preheating section is 3 sections, the stretching section is 3 sections, the shaping section is 4 sections, and the cooling section is 2 sections; stretching ratio 1:5.
(7) traction: and 7 drawing rolls with the diameter of 350 mm.
(8) Winding: and the double-station contact and gap winding machine has the winding width of 4200mm and the winding diameter of 1000 mm.
3) Main process parameters
Plasticizing temperature of the extruder: 255 deg.C
Die temperature: 266 deg.C
Water inlet temperature of the cast piece cold drum: 26 deg.C
The electrostatic adsorption device is arranged at a high voltage: 8.2KV
Setting the temperature of a transverse stretching zone:
the temperature of the preheating zone is 110 DEG C
The temperature of the stretching zone is 90 DEG C
The temperature of the setting area is 75 DEG C
The temperature of the cooling zone was 43 deg.C
Transverse stretching ratio: 1:5.2
Performance detection
Note: the contrast sample is a white film added with 25% titanium dioxide master batch
In summary, the invention has the following advantages:
1. the invention solves the problem of density increase caused by titanium dioxide in the existing white film preparation process, effectively reduces the transparency of the blend film by utilizing the birefringence phenomenon of PE crystals and the difference of the light refractive index between PE and PETG, enables the film to be milky white, abandons the use of titanium dioxide, and has no influence caused by titanium dioxide.
2. The invention utilizes PE as a nucleating agent for PETG crystallization, not only can form PE crystals, but also can induce the formation of the crystals in PETG, ensures the uniform dispersion of the PE crystals and the PET crystals in the blend, achieves the effect of reducing the transparency, and the film is white.
It should be understood that the detailed description of the invention is merely illustrative of the invention and is not intended to limit the invention to the specific embodiments described. It will be appreciated by those skilled in the art that the present invention may be modified or substituted equally as well to achieve the same technical result; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (7)
1. A preparation method of a white polyester heat-shrinkable label film is characterized by comprising the following steps: the label film is of a three-layer co-extrusion structure and comprises an upper surface layer, a lower surface layer and a core layer, wherein the upper surface layer and the lower surface layer use PETG, PE, SEBS and PEG as raw materials, and the core layer uses PETG, PE and SEBS as raw materials.
2. The method for preparing a white polyester heat-shrinkable label film according to claim 1, characterized in that: the thickness ratio of the upper surface to the core layer to the lower surface layer is 10-15: 70-80: 10-15.
3. The method for preparing a white polyester heat-shrinkable label film according to claim 1, characterized in that: the mass ratio of each material in the core layer is as follows: PETG PE SEBS 77-88 10-20: 2-3.
4. The method for preparing a white polyester heat-shrinkable label film according to claim 1, characterized in that: the upper surface and the lower surface layer have the same composition, and the mass ratio of the materials is as follows:
PETG:PE:SEBS:PEG＝81.8-87.2:10-15:2:0.8-1.2。
5. the method for preparing a white polyester heat-shrinkable label film according to claim 1, characterized in that: the label film comprises the following steps:
step 1, adding PETG, PE, SEBS and PEG into an extruder according to a proportion for plasticizing, and then introducing a filter for filtering to obtain a surface layer melt;
step 2, adding PETG, PE and SEBS into an extruder according to a proportion for plasticizing, and then introducing a filter for filtering to obtain a core layer melt;
step 3, compounding the upper surface layer, the core layer and the lower surface of the surface layer melt and the core layer melt through a melt distributor, and carrying out tape casting through a die head to obtain a prefabricated film;
and 4, carrying out quenching roller casting treatment, transverse stretching treatment, traction, rolling, slitting inspection and packaging on the prefabricated film to obtain the label film.
6. The method for preparing a white polyester heat-shrinkable label film according to claim 5, characterized in that: the mass ratio of PETG, PE, SEBS and PEG in the step 1 is 81.8-87.2:10-15:2: 0.8-1.2.
7. The method for preparing a white polyester heat-shrinkable label film according to claim 1, characterized in that: the mass ratio of PETG, PE and SEBS in the step 2 is 77-88:10-20: 2-3.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023092685A1 (en) * | 2021-11-25 | 2023-06-01 | 周菊青 | Thermal shrinkage heavy-duty packaging composite plastic film and preparation method therefor |
| CN117962447A (en) * | 2024-04-02 | 2024-05-03 | 河南银金达新材料股份有限公司 | Floatable white polyester heat-shrinkable film and preparation method thereof |
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Application publication date: 20200327 |