CN106315009B - Wear-resistant patterned cigarette film and preparation method thereof - Google Patents
Wear-resistant patterned cigarette film and preparation method thereof Download PDFInfo
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- CN106315009B CN106315009B CN201610692341.9A CN201610692341A CN106315009B CN 106315009 B CN106315009 B CN 106315009B CN 201610692341 A CN201610692341 A CN 201610692341A CN 106315009 B CN106315009 B CN 106315009B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- 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
-
- 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
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
-
- 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
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
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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
-
- 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
- B32B2307/536—Hardness
-
- 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
- B32B2307/554—Wear resistance
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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
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/04—Antistatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
Abstract
The invention relates to a wear-resistant firework film and a preparation method thereof, wherein the wear-resistant firework film comprises a lower surface layer consisting of polypropylene copolymer and an anti-sticking agent, an intermediate core layer consisting of polypropylene homopolymer, an antistatic agent and a nucleating agent, and an upper surface layer consisting of polypropylene copolymer, modified polyacrylate and the nucleating agent; the lower surface layer, the middle core layer and the upper surface layer are sequentially stuck to form a composite layer; the lower surface layer comprises the following components in percentage by mass: 96-97% of copolymerized polypropylene and 3-4% of anti-sticking agent; the middle core layer comprises the following components in percentage by mass: 94 to 95 percent of homopolymerized polypropylene, 1.5 to 5 percent of antistatic agent and 0.2 to 0.3 percent of nucleating agent; the upper layer comprises the following components in percentage by mass: 60 to 80 percent of copolymerized polypropylene, 20 to 40 percent of modified material and 0.4 to 0.5 percent of nucleating agent. The invention reduces the abrasion of the smoke film in the product transportation process and reduces the loss of enterprises; the abrasion resistance is superior to that of the imported smoke film.
Description
Technical Field
The invention belongs to the technical field of packaging materials, and particularly relates to a wear-resistant patterned cigarette film and a preparation method thereof.
Background
The cigarette packing film is one kind of BOPP film. As a high-grade BOPP film, the cigarette film has the advantages of low heat sealing temperature, better barrier property, high transparency, thickness uniformity and the like compared with a common packaging film.
The performance of the cigarette film is improved along with the requirement of cigarette packaging, and the appearance, physical indexes and other technical requirements of the cigarette film are increasingly homogenized. As an end user of cigarette film, cigarette enterprises tend to use dark and bright pigments more and more in cigarette package design to improve and beautify the visual effect of cigarette packages in order to meet the needs of consumers. Therefore, in the use of the smoke film, a plurality of new problems appear, new requirements are made on the variation of the performance of the smoke film, and the performance of the smoke film is required to be more detailed and diversified. Among them, the smoke film is easy to wear, whiten and fog, which is one of the old and difficult problems.
Because cigarettes are consumption goods with strong liquidity, the cigarette case and the cigarette strips generate scratch marks on the surfaces of cigarette films due to friction between the cigarette case and the cigarette strips in the transportation and circulation processes, and the scratch marks are seriously and even whitened and fogged, so that the pattern of a cigarette label is not clear, the color and luster are dark, particularly, the phenomenon is more obvious on the package of dark-color cigarette strips, and the phenomenon is vividly called as the phenomenon of grinding. Particularly, if large-area frosted white spots appear on the outer package of the high-grade tobacco strips, the image of the product is seriously influenced, and the product is inconsistent with the price of the product, so that the benefit of tobacco enterprises is influenced. Therefore, nowadays, cigarette enterprises strongly require various cigarette film production suppliers to solve the problem of the anti-abrasion performance of the cigarette film.
Under the strong requirements of a plurality of cigarette factories, all cigarette film suppliers take the best speed and splicing technology to try to solve the problem, and other cigarette film manufacturers in China do not develop a wear-resistant patterned cigarette film in the true sense at present, so that the wear-resistant patterned cigarette film is slightly improved and cannot be subjected to pattern grinding compared with the existing product at best.
Disclosure of Invention
The invention provides a wear-resistant patterned cigarette film which is simple in structure, convenient to install and use and capable of improving working efficiency and a preparation method thereof, and aims to solve the problems that in the transportation and circulation processes of cigarette cases and cigarette sticks, scribing traces are generated on the surfaces of cigarette films, and are seriously and even whitened and fogged, so that patterns of cigarette labels are not clear, the colors are dark, and the patterns cannot be abraded.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
a wear-resistant patterned cigarette film comprises a lower surface layer consisting of polypropylene copolymer and an anti-sticking agent, an intermediate core layer consisting of polypropylene copolymer, an antistatic agent and a nucleating agent, and an upper surface layer consisting of polypropylene copolymer, modified polyacrylate and the nucleating agent; the lower surface layer, the middle core layer and the upper surface layer are sequentially stuck to form a composite layer;
the lower surface layer comprises the following components in percentage by mass: 96-97% of copolymerized polypropylene and 3-4% of anti-sticking agent;
the middle core layer comprises the following components in percentage by mass: 94 to 95 percent of homopolymerized polypropylene, 1.5 to 5 percent of antistatic agent and 0.2 to 0.3 percent of nucleating agent;
the upper layer comprises the following components in percentage by mass: 60 to 80 percent of copolymerized polypropylene, 20 to 40 percent of modified material and 0.4 to 0.5 percent of nucleating agent.
Further, the preparation method of the wear-resistant flower cigarette film comprises the following steps:
respectively weighing raw materials of the lower surface layer, the intermediate core layer and the upper surface layer according to the proportion of each component of the lower surface layer, the intermediate core layer and the upper surface layer, respectively and independently mixing the raw materials of the lower surface layer, the intermediate core layer and the upper surface layer, and drying the mixed raw materials; the drying temperature is 80-90 ℃;
feeding the dried raw materials of the lower surface layer, the middle core layer and the upper surface layer into respective extruders respectively for melting, mixing and plasticizing; the melting temperature of the upper surface layer raw material extruder is 210-240 ℃; the melting temperature of the lower surface layer raw material extruder is 210-250 ℃; the middle core layer raw material extruder comprises a first middle core layer raw material extruder and a second middle core layer raw material extruder which are connected in series, wherein the melting temperature of the first middle core layer raw material extruder is 220-250 ℃, and the melting temperature of the second middle core layer raw material extruder is 230-250 ℃;
then respectively sending the melt into three layers of die heads; forming a molten sheet by passing the melt through a flat die orifice; the die gap of the die orifice is: 1.5 mm to 3.0 mm;
attaching the sheet to a chill roll by an air knife and shaping the sheet by a water bath system; the air knife is used to remove air between the extruded molten polymer and the chill roll and also to cool the cast sheet; the air knife angle is used for adjusting the state that pressure air is contacted with the surface of the chill roll when the melt flows down, and the air knife angle is as follows: 10 mm from the slab; the temperature of the water bath system is as follows: 25-40 ℃;
the cast sheet is respectively passed through a longitudinal drawing machine and a transverse drawing machine to draw the sheet into a film; the cast sheet temperature in the cast sheet was: 25-40 ℃;
the film is stretched by a tractor, subjected to thickness measurement and then sent to a winding machine to be wound into a large film roll; the tractor comprises a longitudinal drawing machine and a transverse drawing machine, wherein the temperature of the longitudinal drawing machine and the temperature of the transverse drawing machine are as follows: 75-175 ℃;
the large film roll is cut into finished products after aging treatment, the indoor temperature is 25-35 ℃, the relative humidity is 50-85% and the storage time is 72 hours.
Further, the longitudinal drawing machine and the transverse drawing method of the transverse drawing machine are as follows:
stretching at 25 ℃ below the melting temperature Tm135 ℃ of the copolymer, and arranging air discharge and supply outlets above the transverse stretcher;
in the transverse stretching process, a plurality of step points which are suddenly stretched to the maximum multiple are arranged in the transverse direction of the film, and the step points gradually expand to two sides along with the stretching process until the whole breadth is completely stretched; meanwhile, when the high-transparency cigarette film is stretched, the product of longitudinal stretching times and transverse stretching times of the film reaches 48; the longitudinal stretching multiple is 4.5-5.5, and the transverse stretching multiple is 7.5-9;
and (3) carrying out setting heat treatment on the high-transparency cigarette film after stretching.
Further, a Teflon roll was used in a preheating part of the longitudinal drawing machine, and two small-diameter cooling rolls were installed before longitudinal drawing.
Further, aging treatment is used for enabling the large film roll to sufficiently and freely shrink and release internal stress, so that the antistatic agent and the nucleating agent added in the large film roll gradually migrate from the core layer to the surface layer.
Another object of the present invention is to provide a cigarette case made using the wear-resistant floral film.
The invention has the advantages and positive effects that: the core layer of the wear-resistant patterned cigarette film is the basis for determining the performance of the film and plays a role in supporting, the upper surface layer is a smooth layer, the smoothness of cigarette machine packaging is guaranteed, the surface hardness of the film is increased, the attractiveness is improved, particularly the wear resistance of a smooth surface is improved, the lower layer is a non-smooth layer and is mainly contacted with a cigarette packet, and the close attachment effect of the film and the cigarette packet is improved; the wear-resistant patterned cigarette film reduces the wear of the cigarette film in the product transportation process and reduces the loss of enterprises; the wear-resistant patterned cigarette film provided by the invention has excellent wear resistance which exceeds that of an imported UCB cigarette film, and is well-appreciated and popular by existing cigarette customers.
Drawings
FIG. 1 is a schematic structural diagram of a wear-resistant floral film provided in an embodiment of the present invention;
in the figure: 1. an upper surface layer; 2. a core layer; 3. and (4) a lower surface layer.
Fig. 2 is a flow chart of a preparation method of the wear-resistant flower cigarette film provided by the embodiment of the invention.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
the following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1: the embodiment of the invention provides a wear-resistant patterned cigarette film, which comprises a lower surface layer 3 consisting of polypropylene copolymer and an anti-sticking agent, an intermediate core layer 2 consisting of polypropylene homopolymer, an antistatic agent and a nucleating agent, and an upper surface layer 1 consisting of polypropylene copolymer, modified polyacrylate and a nucleating agent; the lower surface layer, the middle core layer and the upper surface layer are sequentially adhered to form a composite layer.
Further, the lower surface layer comprises the following components in percentage by mass: 96-97% of copolymerized polypropylene and 3-4% of anti-sticking agent;
the middle core layer comprises the following components in percentage by mass: 94 to 95 percent of homopolymerized polypropylene, 0.2 to 0.3 percent of antistatic agent to percent of nucleating agent;
the upper layer comprises the following components in percentage by mass: 60 to 80 percent of copolymerized polypropylene, 20 to 40 percent of modified material and 0.4 to 0.5 percent of nucleating agent.
As shown in fig. 2: the preparation method of the wear-resistant patterned cigarette film provided by the embodiment of the invention comprises the following steps:
s101, weighing raw materials of a lower surface layer, an intermediate core layer and an upper surface layer according to the proportion of the components of the lower surface layer, the intermediate core layer and the upper surface layer, respectively and independently mixing the raw materials of the lower surface layer, the intermediate core layer and the upper surface layer, and drying the mixed raw materials;
s102, respectively feeding the dried raw materials of the lower surface layer, the middle core layer and the upper surface layer into respective extruders for melting, mixing and plasticizing;
s103, respectively sending the molten melts into three layers of die heads; forming a molten sheet by passing the melt through a flat die orifice;
s104, attaching the sheet to a chill roll by an air knife and shaping the sheet by a water bath system;
s105, drawing the cast sheet into a film through a longitudinal drawing machine and a transverse drawing machine respectively;
s106, the film is fed into a winding machine after passing through a tractor and thickness measurement, and is wound into a large film roll;
and S107, cutting the large film roll into finished products after aging treatment.
Further, in the process of producing the wear-resistant flower cigarette film, the drying temperature is 80-90 ℃; the melting temperature of the upper surface layer raw material extruder is 210-240 ℃; the melting temperature of the lower surface layer raw material extruder is 210-250 ℃; the middle core layer raw material extruder comprises a first middle core layer raw material extruder and a second middle core layer raw material extruder which are connected in series, wherein the melting temperature of the first middle core layer raw material extruder is 220-250 ℃, and the melting temperature of the second middle core layer raw material extruder is 230-250 ℃.
Further, the cast sheet temperature is: in the process of producing the high-transparency smoke film, the drying temperature is 80-90 ℃; the melting temperature of the upper surface layer raw material extruder is 210-240 ℃; the melting temperature of the lower surface layer raw material extruder is 210-250 ℃; the middle core layer raw material extruder comprises a first middle core layer raw material extruder and a second middle core layer raw material extruder which are connected in series, wherein the melting temperature of the first middle core layer raw material extruder is 220-250 ℃, and the melting temperature of the second middle core layer raw material extruder is 230-250 ℃.
The cast sheet temperature in the cast sheet was: 25-40 ℃;
the die gap of the die orifice is: 1.8 mm-2.8 mm;
the air knife is used to remove air between the extruded molten polymer and the chill roll and also to cool the cast sheet; the air knife angle is used for adjusting the state that pressure air is contacted with the surface of the chill roll when the melt flows down, and the air knife angle is as follows: 10 mm to 15 mm from the thick sheet;
the temperature of the water bath system is as follows: 25-40 ℃.
Further, the temperature of the longitudinal drawing machine and the transverse drawing machine is as follows: 75-175 ℃;
the longitudinal drawing and transverse drawing method comprises the following steps:
stretching at 25 ℃ below the melting temperature Tm135 ℃ of the copolymer, and arranging air discharge and supply outlets above the transverse stretcher;
in the transverse stretching process, a plurality of step points which are suddenly stretched to the maximum multiple are arranged in the transverse direction of the film, and the step points gradually expand to two sides along with the stretching process until the whole breadth is completely stretched; meanwhile, when the high-transparency cigarette film is stretched, the product of longitudinal stretching times and transverse stretching times of the film reaches 48; the longitudinal stretching multiple is 4.5-5.5, and the transverse stretching multiple is 7.5-9;
and (3) carrying out setting heat treatment on the high-transparency cigarette film after stretching.
A Teflon roller is used in the preheating part of the longitudinal stretching machine, and two cooling rollers with small diameters are installed before longitudinal stretching.
Further, aging treatment is used for enabling the large film roll to fully and freely contract and releasing internal stress, so that the steel increasing agent and the slipping agent added in the large film roll gradually migrate from the core layer to the surface layer;
the indoor temperature is 25-35 ℃ during aging treatment, the relative humidity is 50-85%, and the storage time is 72 hours.
The application of the principles of the present invention will now be described in further detail with reference to specific embodiments.
An apparatus and instrument for use
The equipment for producing the wear-resistant patterned cigarette film is biaxial stretching plastic film equipment which is manufactured by Brukna, Germany and has the world leading level, the instrument is used as a matched detection instrument of a production line, and downstream customer equipment is used for testing.
The main equipment and instruments used are as follows:
1. film production line
The main equipment used is as follows:
(1) a raw material drying, mixing and automatic weighing feeding system;
(2) an extruder set:
a co-extruder A: the diameter of the cylinder body is 75mm, the length-diameter ratio L/D is 33,
a main extruder B: the extruder consists of a melt extruder and a metering extruder.
The diameter of the barrel of the melt extrusion machine is 180mm, the length-diameter ratio L/D is 23.5,
measuring the diameter of the barrel body of the extruder to be 200mm, the length-diameter ratio L/D is 22,
a co-extruder C: the diameter of the cylinder body is 105mm, the length-diameter ratio L/D is 33,
the three extruders are respectively provided with an automatic temperature control and pressure measurement device, and melt filters are arranged on melt pipelines before the melt enters the die head.
(3) A melt line connector;
(4) three layers of T-shaped die heads;
(5) an air knife;
(6) a chill roll;
(7) a water tank;
(8) longitudinally drawing machine;
(9) a transverse drawing machine;
(10) a tractor;
(11) an edge-trim reclamation system;
(12) an automatic thickness measuring system;
(13) a corona treatment system;
(14) automatic winding systems (including automatic cutting devices);
(15) an aging treatment temperature and humidity automatic control system;
(16) a slitting rewinder.
2. The main detecting instrument:
a desk-top thickness gauge, a measuring table,
a tensile testing machine is arranged on the base plate,
a sample tape cutting machine is used for cutting a sample tape,
a baking oven is used for baking the mixture,
a friction coefficient tester,
a heat-sealing machine is arranged on the upper portion of the machine,
the light intensity of the light intensity meter is measured,
a haze tester, a haze tester and a control system,
a tension tester, a pressure measuring device and a controller,
a melt index tester,
an electronic balance is arranged on the base plate,
a microscope is used for taking a sample of the sample,
an attrition instrument.
Selecting and controlling process conditions:
the co-extrusion biaxial stretching process includes feeding mixed plastic material into extruder for smelting, mixing and plasticizing, feeding the molten material into T-shaped three-layer die head, forming molten sheet with the molten material through the die head, attaching the sheet to chilling roller with air knife, setting the sheet in water bath system, drawing the sheet into film in required size with longitudinal drawing machine and transverse drawing machine, measuring the thickness of the film with tractor, winding into large film roll, aging and cutting into product.
In the process of producing the wear-resistant patterned cigarette film, raw material drying, extrusion temperature, cast sheet temperature, die orifice gap, air knife angle, temperature setting of longitudinal drawing and transverse drawing machines, aging treatment conditions and the like are the most important process parameters, and the influence on the product quality is large.
1. Drying raw materials:
because the degradation degree of the stretched film and the existence or nonexistence of bubbles on the film are related to the moisture content in the raw materials, the raw materials are dried at 80-90 ℃ before being extruded in the BOPP production line, and particularly, the problem of overhigh moisture content is solved because the co-extruded surface layer raw materials contain additives which are easy to absorb moisture.
2. Extruding and casting sheets:
the film structure must be three layers as required by the performance of the abrasion resistant floral film. When three-layer co-extrusion equipment is used, the co-polypropylene and the additive are used in the extruder corresponding to the upper surface layer, the modifying material and the additive are used in the extruder corresponding to the lower surface layer, and the homo-polypropylene, the additive and the modifier are used in the core layer main extruder, so that the low-dose effect of the additive having side effect on the film is ensured, and the wear resistance of the film can be improved. When the film is produced, the core layer is the basis for determining the performance of the film and plays a role of supporting, the upper surface layer is a smooth layer, so that the smooth packaging of a cigarette machine is ensured, and the lower surface layer is a non-smooth layer and is mainly contacted with a cigarette packet to improve the close body-adhering effect of the cigarette packet.
When the wear-resistant patterned cigarette film is produced, the waste edges can be recycled without affecting the performance of the film, and the phenomenon that the low-melting-point copolymer of the surface layer pollutes the clamping opening of a tenter during transverse stretching to affect the stretching of the film is avoided.
When the cast sheet is extruded, different extrusion equipment is used because the raw materials of each layer have different properties and the thickness of each layer accounts for different proportions in the sheet, so that the production process has certain differences. The temperature range of the extrusion casting sheet used for producing the wear-resistant firework film is shown in the following table.
TABLE 1 temperature of the abrasion-resistant flower tobacco film extrusion casting process
When the cast sheet is extruded, the die orifice is a forming die for extruding the sheet, is the most critical device for determining the appearance and the size of the cast sheet, and the internal structure of the device is designed according to the performance of plastics, the flow characteristics of a melt and other factors, so that the flow rate of the melt at the whole outlet is uniform, the thickness of the sheet is uniform, the dead angle in the machine head is avoided, and the degradation of the melt is avoided. A 'clothes hanger type' three-layer machine head is selected, the machine head is provided with a branch pipe like a clothes hanger, the expansion angle of the branch pipe is large, and the pressure distribution in the machine head is uniform. The melt flow passage in the machine head is smooth and streamline, the surface roughness Ra is 0.06 mu m, the structure of the machine head body in the width direction is basically symmetrical, the heating is uniform, the smoothness of the damping surface reaches Ra 0.02 mu m, and the straightness is 0.05/300 mm. In addition, the clearance of the die opening of the machine head is the most critical factor for determining the thickness of the film, and the expansion bolt is adopted to adjust the clearance of the die opening, change the transverse thickness of the film and adjust the uniformity of the transverse thickness. The action is performed by an automatic control system of the production line, and the detection signal of the film thickness gauge is utilized to automatically feed back and control a heating coil on the bolt, so that the bolt stretches and contracts to achieve the purpose of adjusting the die opening gap. Secondly, the machine head also considers the problem of recycling the waste edges of the thin film, and designs the width of various molten materials at the junction so as to form the copolymer-free heat seal material on the waste edges of the sheets and facilitate processing.
Secondly, the angle of the air knife is critical when casting the sheet. The air knife is a tool for casting sheet and functions both to remove the air between the extruded molten polymer and the chill roll and to cool the cast sheet. Since the melt between the chill roll and the head is sensitive to external forces and is easily deformed, if the air flowing out of the air knife is not uniform, the sheet fluctuates, the apparent quality of the film is poor, and the transverse cooling is not uniform, and the air flow affects the exhaust degree of the cast sheet, all of which requires that the air knife has an excellent angle which enables the pressure wind to be blown on the line contacting with the chill roll when the melt flows down, so that the sheet can be effectively attached to the surface of the chill roll.
3. The wear-resistant patterned tobacco film stretching process and conditions are as follows:
(1) the stretching process is summarized as follows:
the extruded sheet is subjected to both longitudinal and transverse processes and the necessary heat treatments to form the desired film. The film is stretched under the action of heat and force by a certain ratio, so that polymer molecules and microcrystals are uniformly oriented and crystallized. In stretching polypropylene materials, the following factors must be considered. During the stretching process, the crystallinity is prevented from increasing sharply during preheating and stretching. The stretching temperature is selected not to be in the temperature range of the maximum crystallization rate of the polymer, but preferably to be at a temperature at which crystallization starts to melt and the molecular chain can move, that is, at a temperature of about 25 ℃ below the melting temperature Tm. The polypropylene is a crystalline polymer, the stretching process is a heat release process, so the preheating and stretching heating temperature of the polypropylene is not greatly changed no matter the polypropylene is longitudinally stretched or transversely stretched, and the air exhaust and supply outlets are arranged above the transverse stretching, so that fresh air can be supplemented, additives and lubricating oil vapor can be exhausted, and the condensed oil is prevented from polluting the film.
Due to the greater tendency of the polypropylene material to crystallize, there are problems of "step stretching" and "inherent stretch ratio" in the transverse stretching process, i.e. there are several "step" points in the transverse direction of the film that are suddenly stretched to the maximum ratio, and as the stretching process progresses, the "steps" gradually spread to both sides until all over the web is stretched. Meanwhile, when the abrasion-resistant patterned cigarette film is stretched, the stretching degree of the film must reach the inherent stretching ratio, namely the product of the longitudinal stretching ratio and the transverse stretching ratio of the film must reach about 40. If the stretching ratio in the machine direction is insufficient, a lot of "zebra" or thick stripes appear in the transverse direction of the stretched film, and if the stretching ratio in the transverse direction is too large, film rupture is caused.
The wear-resistant patterned cigarette film needs to be subjected to setting heat treatment after being stretched, the heat treatment is carried out under the action of certain temperature and tension, the relaxation amount of the film after longitudinal stretching during heat treatment is preferably 1.5-5%, and the relaxation amount of the film after transverse stretching during heat treatment is preferably 5-10%.
In addition, the wear-resistant firework film belongs to a heat-sealing film, the surface layer of the wear-resistant firework film uses the copolymerized polypropylene or modified material as a heat-sealing layer (functional layer), and the thickness of the wear-resistant firework film accounts for 8-12% of the total thickness. The melting point of the polypropylene copolymer is 125-135 ℃, and the temperature is 30-40 ℃ lower than the melting point of the homopolymer. When the extruded sheet is preheated to about 130 ℃, the temperature of the copolymer obviously exceeds Tm 135-25 ℃ (135-25 ═ 110 ℃), and if the extruded sheet enters a drawing roll at such a temperature, the surface layer of the copolymer is inevitably seriously damaged. For this reason, we used a teflon roll in the preheating section of the longitudinal drawing machine to prevent the sheet from sticking to the roll during preheating; before longitudinal stretching, two small-diameter cooling rollers are arranged, so that the surface of the sheet can be rapidly cooled, and the core layer can still maintain enough stretching temperature, so that the core layer of the homopolymer and the surface layer of the copolymer have the optimal stretching temperature, and the uniform distribution of the copolymer layer on the surface of the film is also facilitated.
(2) The stretching process conditions of the wear-resistant patterned cigarette film are as follows:
after a plurality of tests, the temperature and the stretching ratio of longitudinal stretching and transverse stretching during the production of the wear-resistant patterned cigarette film are shown in the table 2.
TABLE 2 stretching process conditions of wear-resistant patterned tobacco film
4. Aging treatment conditions are as follows:
the wear-resistant firework film discharged from the winding machine can be cut only after a certain time of aging treatment. The purpose of the aging treatment is as follows: the base film can fully and freely shrink under the aging treatment condition, the internal stress is released, the dimensional stability of the base film is improved, and additives (such as slipping agents and antistatic agents) added in the base film gradually migrate from the core layer to the surface layer under the aging treatment condition to play the role of the base film.
The aging treatment conditions are as follows: the indoor temperature is 25-35 ℃, the relative humidity is 50-85%, and the storage time is more than 72 hours.
Thirdly, selecting raw materials:
the heat sealing range of the wear-resistant patterned cigarette film is required to be 20-30 ℃, so that the raw materials for manufacturing the wear-resistant patterned cigarette film to meet the requirements are very important.
The main raw materials for manufacturing the wear-resistant flower cigarette film are polypropylene, including Homo-polypropylene (Homo-PP) and Co-polypropylene (Co-PP), and the modified material (modified polyacrylate) is adopted. The polypropylene core mainly comprises a surface layer, a core layer and a core layer, wherein the surface layer mainly comprises polypropylene copolymer and a special additive, the other surface layer mainly comprises a modified material and a special additive, and the core layer mainly comprises homopolymerized polypropylene, an antistatic agent, a nucleating agent and other additives.
The homopolypropylene, which is the main factor determining the physical and mechanical properties of the film, is a partially crystalline polymer obtained by polymerizing propylene monomers. Factors that influence the properties of the homo-polypropylene, i.e. the properties of the final film, are: melt index (MFI), isotacticity, crystallinity, additives, molecular weight distribution, etc. of polypropylene. The larger the melt index is, the smaller the melt viscosity is, the more difficult the processing is, the rigidity of the finished film is reduced, the strength is reduced, and the use on a machine is not facilitated; the smaller the isotacticity is, the smaller the crystallinity of the film is, the slower the crystallization speed is, the more difficult the deformation of the film is to keep, the modulus is reduced, and the use on a machine is not facilitated; the more the additive content of the homopolymer is, the larger the amount is, the poorer the optical performance of the finished film is, and the packaging effect is also influenced; the wider the molecular weight distribution of the homopolymer, the good film forming performance is, but the capability of the finished product for maintaining the shape is greatly reduced, namely the modulus is reduced, the use on a machine is not facilitated, in order to ensure the effects of moving and packaging the film, raw materials with proper indexes are selected for guarantee when the film is drawn, and through a plurality of tests, the most suitable homopolymer material with the melt index of 3.2-3.5 g/10min is finally selected, the isotacticity is required to be 95-98%, only basic additives are contained, and the molecular weight distribution is about 4.0-4.5.
In addition, the material selection of the surface layer is very critical, the material of the surface layer of the wear-resistant flower cigarette film is polypropylene copolymer and modified material, the function of the copolymer is to realize the heat sealing of the cigarette film, the modified material mainly plays a role in enhancing wear resistance, therefore, binary copolymer polypropylene with the melt index of 6-8 g/10min or ternary copolymer polypropylene with the melt index of 7-9 g/10min is selected, pure copolymer containing basic additives is selected, and imported modified polyacrylate is used as the modified material. Secondly, in order to ensure that the film does not have adhesion phenomenon in the production process and is beneficial to rolling, an anti-sticking agent with excellent performance is required to be used on at least one surface, and therefore, the anti-sticking agent AB06 or ABVTSC is selected.
The other key point of the wear-resistant firework film is the selection and the dosage of the nucleating agent, and through multiple tests of the invention, the special nucleating agent DMDBS3908 is finally found to be most ideal.
In view of the above analysis, the wear-resistant patterned cigarette film produced by the invention is prepared by mixing the following components in proportion:
a smooth layer:
60-80% of copolymerized polypropylene,
20 to 40 percent of modified material,
0.4-0.5% of nucleating agent;
core layer:
94-95% of homopolymerized polypropylene,
0.2-0.3% of nucleating agent;
non-slip layer:
96-97 percent of copolymerized polypropylene,
3-4% of an anti-sticking agent;
the raw materials in the formula design have the following specific requirements: the melt index of the homopolymerized polypropylene is 3.2-3.5 g/10min, the melt index of the copolymerized polypropylene is 6-8 g/10min, the melt index of the modified material is 7-9 g/10min, AB06 or ABVTSC is used as an anti-sticking agent, and SP6 or SA03 is used as a slipping agent.
Fourthly, experiment and application results:
the wear-resistant patterned cigarette film developed by the invention is used in factories such as Henan Luoyang cigarette factories, Henan Xinzheng cigarette factories, Henan Zheng Zhou cigarette general factories, Hubei Guangshui cigarette factories, Hubei Sanxia cigarette factories and the like, has obvious effect, is comparable to imported UCB cigarette films, gradually replaces the imported UCB cigarette films with better cost performance, and becomes a novel material which is purchased by various big cigarette factories.
Through trial in various cigarette factories, the test investigation method is that the wrapped strip box is put into a big box, the transportation condition is simulated, the strip box is put in the box to run for more than 1000 kilometers, then the box is opened for inspection, and through comparison tests, the novel wear-resistant patterned cigarette film developed by the invention achieves the level of an imported UCB cigarette film.
The product is produced by selecting brand new special materials and brand new process formulas, has obvious wear resistance, can effectively overcome the phenomenon of frosting and whitening of the strip pack, improves the pattern definition of the strip pack product, and can keep better skin packaging effect.
Product inspection and standard:
the wear-resistant patterned cigarette film developed by the invention is inspected by Hubei province product quality supervision and inspection, and the product quality is qualified according to GB/T12026-2000 standard inspection.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (4)
1. A wear-resistant floral film, comprising: a lower surface layer, an intermediate core layer and an upper surface layer; the lower surface layer, the middle core layer and the upper surface layer are sequentially stuck to form a composite layer;
the lower surface layer consists of copolymerized polypropylene and an anti-sticking agent;
the middle core layer consists of homopolymerized polypropylene, an antistatic agent and a nucleating agent;
the upper surface layer consists of copolymerized polypropylene, modified polyacrylate and a nucleating agent;
the lower surface layer comprises the following components in percentage by mass: 96-97% of copolymerized polypropylene and 3-4% of anti-sticking agent;
the middle core layer comprises the following components in percentage by mass: 94 to 95 percent of homopolymerized polypropylene, 1.5 to 5 percent of antistatic agent and 0.2 to 0.3 percent of nucleating agent;
the upper layer comprises the following components in percentage by mass: 60 to 80 percent of copolymerized polypropylene, 20 to 40 percent of modified polyacrylate and 0.4 to 0.5 percent of nucleating agent;
the melt index of the homopolymerized polypropylene is 3.2-3.5 g/10min, and the isotacticity is 95-98%; the anti-sticking agent is selected from AB06 or ABVTSC;
the preparation method of the wear-resistant patterned cigarette film comprises the following steps:
respectively weighing raw materials of the lower surface layer, the intermediate core layer and the upper surface layer according to the proportion of each component of the lower surface layer, the intermediate core layer and the upper surface layer, respectively and independently mixing the raw materials of the lower surface layer, the intermediate core layer and the upper surface layer, and drying the mixed raw materials; the drying temperature is 80-90 ℃;
feeding the dried raw materials of the lower surface layer, the middle core layer and the upper surface layer into respective extruders respectively for melting, mixing and plasticizing; the melting temperature of the upper surface layer raw material extruder is 210-240 ℃; the melting temperature of the lower surface layer raw material extruder is 210-250 ℃; the middle core layer raw material extruder comprises a first middle core layer raw material extruder and a second middle core layer raw material extruder which are connected in series, wherein the melting temperature of the first middle core layer raw material extruder is 220-250 ℃, and the melting temperature of the second middle core layer raw material extruder is 230-250 ℃;
then respectively sending the melt into three layers of die heads; forming a molten sheet by passing the melt through a flat die orifice; the die gap of the die orifice is: 1.5 mm to 3.0 mm;
attaching the sheet to a chill roll by an air knife and shaping the sheet by a water bath system; the air knife is used to remove air between the extruded molten polymer and the chill roll and also to cool the cast sheet; the air knife angle is used for adjusting the state that pressure air is contacted with the surface of the chill roll when the melt flows down, and the air knife angle is as follows: 10 mm from the slab; the temperature of the water bath system is as follows: 25-40 ℃;
the cast sheet is respectively passed through a longitudinal drawing machine and a transverse drawing machine to draw the sheet into a film; the cast sheet temperature in the cast sheet was: 25-40 ℃;
the film is stretched by a tractor, subjected to thickness measurement and then sent to a winding machine to be wound into a large film roll; the tractor comprises a longitudinal drawing machine and a transverse drawing machine, wherein the temperature of the longitudinal drawing machine and the temperature of the transverse drawing machine are as follows: 75-175 ℃;
the large film roll is cut into finished products after aging treatment, the indoor temperature is 25-35 ℃, the relative humidity is 50-85% and the storage time is 72 hours;
the longitudinal drawing machine and the transverse drawing method of the transverse drawing machine are as follows:
stretching at 25 ℃ below the melting temperature Tm135 ℃ of the copolymer, and arranging air discharge and supply outlets above the transverse stretcher;
in the transverse stretching process, a plurality of step points which are suddenly stretched to the maximum multiple are arranged in the transverse direction of the film, and the step points gradually expand to two sides along with the stretching process until the whole breadth is completely stretched; meanwhile, when the high-transparency cigarette film is stretched, the product of longitudinal stretching times and transverse stretching times of the film reaches 48; the longitudinal stretching multiple is 4.5-5.5, and the transverse stretching multiple is 7.5-9;
and (3) carrying out setting heat treatment on the high-transparency cigarette film after stretching.
2. The method for preparing an abrasion-resistant patterned tobacco film according to claim 1, wherein a polytetrafluoroethylene roll is used in a preheating section of the longitudinal stretching machine, and two small-diameter cooling rolls are installed before longitudinal stretching.
3. The method of making an abrasion resistant cigarette film of claim 1 wherein the aging treatment is used to allow the large film roll to shrink freely enough to release internal stresses such that the antistatic and nucleating agents added to the large film roll gradually migrate from the core layer to the surface layer.
4. A cigarette pack prepared using the wear-resistant floral film of claim 1.
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| CN106928563A (en) * | 2017-04-06 | 2017-07-07 | 江阴中达软塑新材料股份有限公司 | A kind of anti-scratch wear-resisting cigarette external packaging film |
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| CN109280270B (en) * | 2018-09-25 | 2021-06-29 | 宁波瑞成包装材料有限公司 | Production method of high-temperature-resistant high-barrier polypropylene film |
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| CN109233105B (en) * | 2018-09-25 | 2021-06-29 | 宁波瑞成包装材料有限公司 | Production method of stretch-resistant high-barrier polypropylene film |
| CN109233106B (en) * | 2018-09-25 | 2021-06-29 | 宁波瑞成包装材料有限公司 | Production method of low-cost high-barrier polypropylene film |
| CN109677073A (en) * | 2018-12-27 | 2019-04-26 | 海南赛诺实业有限公司 | Superpower wear-resistant BOPP cigarette package film and preparation method |
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