CN106739358B - A kind of fresh-keeping BOPP film of micropore and preparation method thereof - Google Patents

A kind of fresh-keeping BOPP film of micropore and preparation method thereof Download PDF

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Publication number
CN106739358B
CN106739358B CN201611218784.0A CN201611218784A CN106739358B CN 106739358 B CN106739358 B CN 106739358B CN 201611218784 A CN201611218784 A CN 201611218784A CN 106739358 B CN106739358 B CN 106739358B
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parts
layer
micropore
fresh
keeping
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CN106739358A (en
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杨东
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Shandong Shun Kai Composite Material Co Ltd
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Shandong Shun Kai Composite Material Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • B29C55/146—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly transversely to the direction of feed and then parallel thereto
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/04—Punching, slitting or perforating
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. 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
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/02—Cellular or porous
    • B32B2305/026—Porous
    • 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
    • B32B2307/412—Transparent
    • 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
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
    • 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
    • B32B2307/724—Permeability to gases, adsorption

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention provides a kind of fresh-keeping BOPP films of micropore, belong to bidirectional stretching polypropylene film technical field, including upper epidermis, sandwich layer, layer, upper epidermis is arranged in the sandwich layer upper surface, layer is arranged in sandwich layer lower surface, it is characterized in that, the upper epidermis is antiblocking layers, the upper epidermis and following table layer surface are evenly arranged with the micropore as made from laser boring of preset quantity, preparation method is additionally arranged laser boring in last procedure of film, simple process, control is accurate, and micropore spacing and size is adjusted, film obtained has good gas permeability and mechanical property, pore-free defect torn edges, interior atmosphere is packed suitable for average regulation, play the role of more preferable fresh-keeping effect.

Description

A kind of fresh-keeping BOPP film of micropore and preparation method thereof
Technical field
The invention belongs to bidirectional stretching polypropylene film technical fields, are in particular a kind of fresh-keeping BOPP films of micropore And preparation method thereof.
Background technique
Specialized recently as the improvement of people's living standards and agricultural planting, the demand of fresh fruit of vegetables is increasing, Due to fruits and vegetables effect of breathing certainly during packed and transported, it is continuous that consumption oxygen generates gases, the gas ratios such as carbon dioxide Variation generates dematuration to fruits and vegetables itself in airtight package, while breathing and generating steam formation wet environment growth bacterium It rots.To extend the fruits and vegetables long-period freshness preserving phase, gas regulation package and fresh keeping technology is widely used.Currently used preservation technology has inorganic fill out Expect polymer stretching technique, inorganic filler is added in film formation process and stretches generation gap, predominantly polyethylene film；Half Stretching technique is crystallized, crystal generates micropore, predominantly polypropylene film during stretching；Chemical method foaming technique is polymerizeing Foaming agent foam is added in object forming process and generates micropore, the less application for preservative film.
Above scheme has that micropore size is smaller or film inner sealing micropore, can not quickly sufficiently adjust inside and outside packaging bag The problem of atmosphere ratio, fresh-keeping effect is poor, is unable to satisfy Fresh-keeping Packaging for Fruits and Vegetables requirement.At present frequently with method be using straight The different pin hole of diameter or cutter get a series of holes on film, but the punched hole diameter of this method is larger, and controlling is poor, nothing Method realizes that the effect of interior atmosphere is packed in average regulation.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of novel microporous fresh-keeping BOPP film and preparation method thereof, works Skill is simple, and precisely, the fresh-keeping BOPP film of micropore has good gas permeability and mechanical property, and between adjustable micropore for control Away from and size, be suitable for different type fruits and vegetables it is persistently fresh-keeping, excellent effect.
The present invention is that technical solution used by solving its technical problem is：The fresh-keeping BOPP film of micropore, including it is upper Upper epidermis is arranged in surface layer, sandwich layer, layer, the sandwich layer upper surface, and layer is arranged in sandwich layer lower surface, which is characterized in that institute Stating upper epidermis is antiblocking layers, and the upper epidermis and following table layer surface are evenly arranged with being made by laser boring for preset quantity Micropore, the micropore size is 10-40um, the pore density 30-150/cm2, the sandwich layer is 3- by parts by weight 10 parts of antistatic agent, 20-25 parts of intensity strengthening agent and 65-77 parts of homopolypropylene composition.
The layer is set as antiblocking layers.
Homopolypropylene and 0.05-0.2 part anti-blocking agents of the antiblocking layers by parts by weight for 99.8-99.95 parts Composition, the anti-blocking agent use partial size for 1-8 μm of silica.
The layer is set as hot sealing layer, the hot sealing layer by parts by weight be 99.8-99.95 part heat-sealing material with 0.05-0.2 parts of anti-blocking agent composition, heat-sealing material using ternary polymerized polypropylene, the anti-blocking agent use partial size for 1-8 μm of silica.
The layer is set as antibiotic layer, homopolypropylene and 20- of the antibiotic layer by parts by weight for 50-80 parts 50 parts of antibacterial matrices composition, the antibacterial matrices use PTK antibacterial agent.
The monoglyceride and 50-90 parts of amine ethoxylates that the antistatic agent is 10-50 parts by parts by weight form, the stiffening Agent uses C9 hydrogenated petroleum resin.
The upper epidermis, layer thickness be the 5-10% of the fresh-keeping BOPP film overall thickness of the micropore.
A kind of preparation method of the fresh-keeping BOPP film of micropore, which is characterized in that include the following steps：
1. weighing raw material according to the parts by weight of the sandwich layer, upper epidermis, layer；
2. respective extruder is added after mixing respectively in dry materials used in sandwich layer, upper epidermis, each layer of layer In, material fusion plastification in an extruder, extruder temperature is at 230-250 DEG C；
Converge 3. three kinds of materials after fusion plastification squeeze out at die head, is made 2-3mm sheet, 250 DEG C of die head temperature；
4. sheet carries out cooling slab by fitting chilling roller and sink, chilling roller temperature is at 30-40 DEG C；
5. slab is carried out in the case where the area Zong La is by 130-140 DEG C preheating, stretching, sizing of region by 5 times of stretching ratios longitudinal It stretches；
The area ⑥Heng La at preheating, stretching, sizing, 150-180 DEG C of cooled region by 8 times of stretching ratios by being carried out laterally It stretches；
7. the film by gradually biaxial tension is thin to get the fresh-keeping BOPP of micropore through cooling, traction flattening, winder winding Film parent roll；
8. specification cuts into the finished films that width is 1400-2200mm to parent roll as required after 48 hours timeliness；
9. laser boring：Finished films volume is placed on laser-beam drilling machine and continuously traction unreels, film is worn and passes sequentially through Processor, nip rolls and rolling frame are punched, according to the aperture of BOPP film and pore density demand, is arranged by computer end and is punched Parameter spot diameter and trepanning velocity carry out laser boring, and micropore is made and handles film roll；The spot diameter is 10-40um, institute Stating trepanning velocity is the hole 250-1150/s.
The step laser power that 9. middle laser-beam drilling machine uses is 200W, optical maser wavelength 1064nm, transmission speed For 60m/min.
The beneficial effects of the invention are as follows：
1. punching processing by membrane laser improves the gas permeability of BOPP film, the gas diffusion that interior fruits and vegetables generate will be packed It goes out, adjusts atmosphere and keep oxygen and carbon dioxide ratio consistent with the external world, reduce ethyl alcohol and acetaldehyde gas that anaerobic respiration generates Body influences flavor, achievees the purpose that long-period freshness preserving；The steam that breathing generates is volatilized away by micropore simultaneously, bacterium is reduced and grows Raw breeding, extends the preserving fruit and vegetable utilizing phase；
2. polypropylene material is shunk at high temperature due to generating high fever in laser drilling process, cause hole that can reduce even It disappears, while being formed around micropore and burning side phenomenon, the present invention is improved by adjusting the technological parameters such as draw ratio, intensity strengthening agent being added Film shrink performance, so that membrane laser punching processing back aperture uniformity reduces without diminution and burns side phenomenon, gas permeability is steady It is fixed；Big for respiratory intensity, washy packaging product, internal layer add the antibacterial agent for meeting food contact requirements, further subtract Few bacteria breed, Shelf-life；
3. film additive is nontoxic, food can be directly contacted, has transparency, surface gloss high, surface prints The good feature of brushing effects；
4. simplifying processing technology without techniques such as compound, laminations in manufacturing process；
5. punching compared to existing machinery pin hole, the present invention has micropore spacing and adjustable, pore-free defect torn edges etc. Advantage has good gas permeability and mechanical property, can be different with the different designs of fresh-keeping requirement according to packing material breathing characteristic Aperture, density micropore, realize the lasting fresh-keeping effect of different type fruits and vegetables, achieve the purpose that long acting fresh-keeping.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
In figure：1. upper epidermis, 2. sandwich layers, 3. layers, 4. micropores.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawings and examples, so that the public better grasps the present invention Implementation method.
Embodiment 1
As shown in Figure 1, the present invention provides a kind of fresh-keeping BOPP film of micropore, including upper epidermis 1, sandwich layer 2, layer 3, institute 2 upper surface of sandwich layer setting upper epidermis 1 is stated, layer 3 is arranged in 2 lower surface of sandwich layer, and the upper epidermis 1 and 3 surface of layer are uniform It is provided with 30 the aperture 10um as made from laser boring, the pore density/cm of preset quantity2Micropore 4；
The fresh-keeping BOPP film of micropore is prepared from the following raw materials in parts by weight：It is homopolymerization in terms of 1000 parts by total number Polypropylene：794.78 part, antistatic agent：28 parts, intensity strengthening agent：177 parts, anti-blocking agent：0.22 part；
Wherein, upper epidermis is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.89 parts, 0.11 part of anti-blocking agent；
Sandwich layer 2 accounts for 888 parts altogether, wherein 683 parts of homopolypropylene, intensity strengthening agent：177 parts, 28 parts of antistatic agent；
Layer is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.89 parts, 0.11 part of anti-blocking agent；
Anti-blocking agent of the present invention uses partial size for 1-8 μm of silica, and the antistatic agent is by components by weight percent It is formed for 10% monoglyceride and 90% amine ethoxylate, the intensity strengthening agent uses C9 hydrogenated petroleum resin.
Upper epidermis 1 of the present invention, layer 3 thickness be the 5% of the fresh-keeping BOPP film overall thickness of the micropore.
The preparation method of the fresh-keeping BOPP film of micropore, includes the following steps：
1. weighing raw material according to the parts by weight of the sandwich layer 2, upper epidermis 1, layer 3；
2. respective extrusion is added after mixing respectively in dry materials used in sandwich layer 2, upper epidermis 1, each layer of layer 3 In machine, material fusion plastification in an extruder, extruder temperature is at 230 DEG C；
Converge 3. three kinds of materials after fusion plastification squeeze out at die head, is made 2-3mm sheet, 250 DEG C of die head temperature；
4. sheet carries out cooling slab by fitting chilling roller and sink, chilling roller temperature is at 30 DEG C；
5. slab presses 5 times of stretching ratios in the case where the area Zong La is by preheating, stretching, sizing 130-140 DEG C of region ladder temperature control Carry out longitudinal stretching；
The area ⑥Heng La is by pressing 8 times of stretching ratios under 150-180 DEG C of preheating, stretching, sizing, cooled region ladder temperature control Carry out cross directional stretch；
7. the film by gradually biaxial tension is thin to get the fresh-keeping BOPP of micropore through cooling, traction flattening, winder winding Film parent roll；
8. specification cuts into the finished films that width is 1400mm to parent roll as required after 48 hours timeliness；
9. laser boring：Finished films volume is placed on laser-beam drilling machine and continuously traction unreels, film is worn and passes sequentially through Punch processor, nip rolls and rolling frame, by computer end be arranged downhole parameter laser power 200w, optical maser wavelength 1064nm, Spot diameter 10um, transmission speed 60m/min, 250 holes of trepanning velocity/s carry out laser boring, and micropore size 10um, micro- is made 30/cm of hole density2Micropore handle film roll.
Embodiment 2
The present invention provides a kind of fresh-keeping BOPP film of micropore, including upper epidermis 1, sandwich layer 2, layer 3, on the sandwich layer 2 Upper epidermis 1 is arranged in surface, and layer 3 is arranged in 2 lower surface of sandwich layer, and the upper epidermis 1 and 3 surface of layer are evenly arranged with default 30 the aperture 10um as made from laser boring, the pore density/cm of quantity2Micropore 4；
The fresh-keeping BOPP film of micropore is prepared from the following raw materials in parts by weight：It is homopolymerization in terms of 1000 parts by total number Polypropylene：794.86 part, antistatic agent：28 parts, intensity strengthening agent：177 parts, anti-blocking agent：0.14 part；
Wherein, upper epidermis is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.93 parts, 0.07 part of anti-blocking agent；
Sandwich layer 2 accounts for 888 parts altogether, wherein 683 parts of homopolypropylene, intensity strengthening agent：177 parts, 28 parts of antistatic agent；
Layer is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.93 parts, 0.07 part of anti-blocking agent；
Anti-blocking agent of the present invention uses partial size for 1-8 μm of silica, and the antistatic agent is by components by weight percent It is formed for 10% monoglyceride and 90% amine ethoxylate, the intensity strengthening agent uses C9 hydrogenated petroleum resin.
Upper epidermis 1 of the present invention, layer 3 thickness be the 5% of the fresh-keeping BOPP film overall thickness of the micropore.
The preparation method is the same as that of Example 1 for the fresh-keeping BOPP film of micropore.
Embodiment 3
The present invention provides a kind of fresh-keeping BOPP film of micropore, including upper epidermis 1, sandwich layer 2, layer 3, on the sandwich layer 2 Upper epidermis 1 is arranged in surface, and layer 3 is arranged in 2 lower surface of sandwich layer, and the upper epidermis 1 and 3 surface of layer are evenly arranged with default 30 the aperture 10um as made from laser boring, the pore density/cm of quantity2Micropore 4；
The fresh-keeping BOPP film of micropore is prepared from the following raw materials in parts by weight：It is homopolymerization in terms of 1000 parts by total number Polypropylene：794.94 part, antistatic agent：28 parts, intensity strengthening agent：177 parts, anti-blocking agent：0.06 part；
Wherein, upper epidermis is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.97 parts, 0.03 part of anti-blocking agent；
Sandwich layer 2 accounts for 888 parts altogether, wherein 683 parts of homopolypropylene, intensity strengthening agent：177 parts, 28 parts of antistatic agent；
Layer is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.97 parts, 0.03 part of anti-blocking agent；
Anti-blocking agent of the present invention uses partial size for 1-8 μm of silica, and the antistatic agent is by components by weight percent It is formed for 10% monoglyceride and 90% amine ethoxylate, the intensity strengthening agent uses C9 hydrogenated petroleum resin.
Upper epidermis 1 of the present invention, layer 3 thickness be the 5% of the fresh-keeping BOPP film overall thickness of the micropore.
The preparation method is the same as that of Example 1 for the fresh-keeping BOPP film of micropore.
Embodiment 4
The present invention provides a kind of fresh-keeping BOPP film of micropore, including upper epidermis 1, sandwich layer 2, layer 3, on the sandwich layer 2 Upper epidermis 1 is arranged in surface, and layer 3 is arranged in 2 lower surface of sandwich layer, and the upper epidermis 1 and 3 surface of layer are evenly arranged with default 90 the aperture 25um as made from laser boring, the pore density/cm of quantity2Micropore 4；
The fresh-keeping BOPP film of micropore is prepared from the following raw materials in parts by weight：It is homopolymerization in terms of 1000 parts by total number Polypropylene：678.93 part；Heat-sealing material:65.87 parts；Antistatic agent：53 parts, intensity strengthening agent：202 parts, anti-blocking agent：0.2 part；
Wherein upper epidermis is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.93 parts, 0.07 part of anti-blocking agent；
Sandwich layer accounts for 878 parts altogether, wherein 623 parts of homopolypropylene, intensity strengthening agent：202 parts, 53 parts of antistatic agent.
Layer is hot sealing layer, accounts for 66 parts altogether, wherein 65.87 parts of heat-sealing material, anti-blocking agent：0.13 part.
Anti-blocking agent of the present invention uses partial size for 1-8 μm of silica, and the antistatic agent is by components by weight percent It is formed for 50% monoglyceride and 50% amine ethoxylate, the intensity strengthening agent uses C9 hydrogenated petroleum resin, and the heat-sealing material uses three First copolymer polypropylene.
Upper epidermis 1 of the present invention, layer 3 thickness be the 8% of the fresh-keeping BOPP film overall thickness of the micropore.
The preparation method of the fresh-keeping BOPP film of micropore, includes the following steps：
1. weighing raw material according to the parts by weight of the sandwich layer 2, upper epidermis 1, layer 3；
2. respective extrusion is added after mixing respectively in dry materials used in sandwich layer 2, upper epidermis 1, each layer of layer 3 In machine, material fusion plastification in an extruder, extruder temperature is at 240 DEG C；
Converge 3. three kinds of materials after fusion plastification squeeze out at die head, is made 2-3mm sheet, 250 DEG C of die head temperature；
4. sheet carries out cooling slab by fitting chilling roller and sink, chilling roller temperature is at 35 DEG C；
5. slab presses 5 times of stretching ratios in the case where the area Zong La is by preheating, stretching, sizing 130-140 DEG C of region ladder temperature control Carry out longitudinal stretching；
The area ⑥Heng La is by pressing 8 times of stretching ratios under 150-180 DEG C of preheating, stretching, sizing, cooled region ladder temperature control Carry out cross directional stretch；
7. the film by gradually biaxial tension is thin to get the fresh-keeping BOPP of micropore through cooling, traction flattening, winder winding Film parent roll；
8. specification cuts into the finished films that width is 1800mm to parent roll as required after 48 hours timeliness；
9. laser boring：Finished films volume is placed on laser-beam drilling machine and continuously traction unreels, film is worn and passes sequentially through Punch processor, nip rolls and rolling frame, by computer end be arranged downhole parameter laser power 200w, optical maser wavelength 1064nm, Spot diameter 25um, transmission speed 60m/min, 700 holes of trepanning velocity/s carry out laser boring, and micropore size 25um, micro- is made 90/cm of hole density2Micropore handle film roll.
Embodiment 5
The present invention provides a kind of fresh-keeping BOPP film of micropore, including upper epidermis 1, sandwich layer 2, layer 3, on the sandwich layer 2 Upper epidermis 1 is arranged in surface, and layer 3 is arranged in 2 lower surface of sandwich layer, and the upper epidermis 1 and 3 surface of layer are evenly arranged with default 90 the aperture 25um as made from laser boring, the pore density/cm of quantity2Micropore 4；
The fresh-keeping BOPP film of micropore is prepared from the following raw materials in parts by weight：It is homopolymerization in terms of 1000 parts by total number Polypropylene：678.93 part；Heat-sealing material:65.92 parts；Antistatic agent：53 parts, intensity strengthening agent：202 parts, anti-blocking agent：0.15 part；
Wherein upper epidermis is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.93 parts, 0.07 part of anti-blocking agent；
Sandwich layer accounts for 878 parts altogether, wherein 623 parts of homopolypropylene, intensity strengthening agent：202 parts, 53 parts of antistatic agent.
Layer is hot sealing layer, accounts for 66 parts altogether, wherein 65.92 parts of heat-sealing material, anti-blocking agent：0.08 part.
Anti-blocking agent of the present invention uses partial size for 1-8 μm of silica, and the antistatic agent is by components by weight percent It is formed for 50% monoglyceride and 50% amine ethoxylate, the intensity strengthening agent uses C9 hydrogenated petroleum resin, and the heat-sealing material uses three First copolymer polypropylene.
Upper epidermis 1 of the present invention, layer 3 thickness be the 8% of the fresh-keeping BOPP film overall thickness of the micropore.
The preparation process of the fresh-keeping BOPP film of micropore is the same as embodiment 4.
Embodiment 6
The present invention provides a kind of fresh-keeping BOPP film of micropore, including upper epidermis 1, sandwich layer 2, layer 3, on the sandwich layer 2 Upper epidermis 1 is arranged in surface, and layer 3 is arranged in 2 lower surface of sandwich layer, and the upper epidermis 1 and 3 surface of layer are evenly arranged with default 90 the aperture 25um as made from laser boring, the pore density/cm of quantity2Micropore 4；
The fresh-keeping BOPP film of micropore is prepared from the following raw materials in parts by weight：It is homopolymerization in terms of 1000 parts by total number Polypropylene：678.93 part；Heat-sealing material:65.97 parts；Antistatic agent：53 parts, intensity strengthening agent：202 parts, anti-blocking agent：0.1 part；
Wherein upper epidermis is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.93 parts, 0.07 part of anti-blocking agent；
Sandwich layer accounts for 878 parts altogether, wherein 623 parts of homopolypropylene, intensity strengthening agent：202 parts, 53 parts of antistatic agent.
Layer is hot sealing layer, accounts for 66 parts altogether, wherein 65.97 parts of heat-sealing material, anti-blocking agent：0.03 part.
Anti-blocking agent of the present invention uses partial size for 1-8 μm of silica, and the antistatic agent is by components by weight percent It is formed for 50% monoglyceride and 50% amine ethoxylate, the intensity strengthening agent uses C9 hydrogenated petroleum resin, and the heat-sealing material uses three First copolymer polypropylene.
Upper epidermis 1 of the present invention, layer 3 thickness be the 8% of the fresh-keeping BOPP film overall thickness of the micropore.
The preparation process of the fresh-keeping BOPP film of micropore is the same as embodiment 4.
Embodiment 7
The present invention provides a kind of fresh-keeping BOPP film of micropore, including upper epidermis 1, sandwich layer 2, layer 3, on the sandwich layer 2 Upper epidermis 1 is arranged in surface, and layer 3 is arranged in 2 lower surface of sandwich layer, and the upper epidermis 1 and 3 surface of layer are evenly arranged with default 150 the aperture 40um as made from laser boring, the pore density/cm of quantity2Micropore 4.
The fresh-keeping BOPP film of micropore is prepared from the following raw materials in parts by weight：It is homopolymerization in terms of 1000 parts by total number Polypropylene：659.97 part；Antistatic agent：88 parts, intensity strengthening agent：219 parts, anti-blocking agent：0.03 part；33 parts of antibacterial matrices.
Wherein upper epidermis is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.97 parts, 0.03 part of anti-blocking agent；
Sandwich layer accounts for 878 parts altogether, wherein 571 parts of homopolypropylene, intensity strengthening agent：219 parts, 88 parts of antistatic agent.
Layer is antibiotic layer, accounts for 66 parts altogether, wherein 33 parts of homopolypropylene, antibacterial matrices：33 parts.
Anti-blocking agent of the present invention uses partial size for 1-8 μm of silica, and the antistatic agent is by components by weight percent It is formed for 30% monoglyceride and 70% amine ethoxylate, the intensity strengthening agent uses C9 hydrogenated petroleum resin, and the antibacterial matrices use PTK antibacterial agent.
Upper epidermis 1 of the present invention, layer 3 thickness be the 10% of the fresh-keeping BOPP film overall thickness of the micropore.
The preparation method of the above-mentioned fresh-keeping BOPP film of micropore, includes the following steps：
1. weighing raw material according to the parts by weight of the sandwich layer 2, upper epidermis 1, layer 3；
2. respective extrusion is added after mixing respectively in dry materials used in sandwich layer 2, upper epidermis 1, each layer of layer 3 In machine, material fusion plastification in an extruder, extruder temperature is at 250 DEG C；
Converge 3. three kinds of materials after fusion plastification squeeze out at die head, is made 2-3mm sheet, 250 DEG C of die head temperature；
4. sheet carries out cooling slab by fitting chilling roller and sink, chilling roller temperature is at 40 DEG C；
5. slab presses 5 times of stretching ratios in the case where the area Zong La is by preheating, stretching, sizing 130-140 DEG C of region ladder temperature control Carry out longitudinal stretching；
The area ⑥Heng La is by pressing 8 times of stretching ratios under 150-180 DEG C of preheating, stretching, sizing, cooled region ladder temperature control Carry out cross directional stretch；
7. the film by gradually biaxial tension is thin to get the fresh-keeping BOPP of micropore through cooling, traction flattening, winder winding Film parent roll；
8. specification cuts into the finished films that width is 2200mm to parent roll as required after 48 hours timeliness；
9. laser boring：Finished films volume is placed on laser-beam drilling machine and continuously traction unreels, film is worn and passes sequentially through Punch processor, nip rolls and rolling frame, by computer end be arranged downhole parameter laser power 200w, optical maser wavelength 1064nm, Spot diameter 40um, transmission speed 60m/min, 1150 holes of trepanning velocity/s, progress laser boring, obtained micropore size 40um, 150/cm of pore density2Micropore handle film roll.
Embodiment 8
The present invention provides a kind of fresh-keeping BOPP film of micropore, including upper epidermis 1, sandwich layer 2, layer 3, on the sandwich layer 2 Upper epidermis 1 is arranged in surface, and layer 3 is arranged in 2 lower surface of sandwich layer, and the upper epidermis 1 and 3 surface of layer are evenly arranged with default 150 the aperture 40um as made from laser boring, the pore density/cm of quantity2Micropore 4.
The fresh-keeping BOPP film of micropore is prepared from the following raw materials in parts by weight：It is homopolymerization in terms of 1000 parts by total number Polypropylene：669.97 part；Antistatic agent：88 parts, intensity strengthening agent：219 parts, 0.03 part of anti-blocking agent；23 parts of antibacterial matrices.
Wherein upper epidermis is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.97 parts, 0.03 part of anti-blocking agent；
Sandwich layer accounts for 878 parts altogether, wherein 571 parts of homopolypropylene, intensity strengthening agent：219 parts, 88 parts of antistatic agent.
Layer is antibiotic layer, accounts for 66 parts altogether, wherein 43 parts of homopolypropylene, antibacterial matrices：23 parts.
Anti-blocking agent of the present invention uses partial size for 1-8 μm of silica, and the antistatic agent is by components by weight percent It is formed for 30% monoglyceride and 70% amine ethoxylate, the intensity strengthening agent uses C9 hydrogenated petroleum resin, and the antibacterial matrices use PTK antibacterial agent.
Upper epidermis 1 of the present invention, layer 3 thickness be the 10% of the fresh-keeping BOPP film overall thickness of the micropore.
The preparation method of the fresh-keeping BOPP film of micropore is the same as embodiment 7.
Embodiment 9
The present invention provides a kind of fresh-keeping BOPP film of micropore, including upper epidermis 1, sandwich layer 2, layer 3, on the sandwich layer 2 Upper epidermis 1 is arranged in surface, and layer 3 is arranged in 2 lower surface of sandwich layer, and the upper epidermis 1 and 3 surface of layer are evenly arranged with default 150 the aperture 40um as made from laser boring, the pore density/cm of quantity2Micropore 4.
The fresh-keeping BOPP film of micropore is prepared from the following raw materials in parts by weight：It is homopolymerization in terms of 1000 parts by total number Polypropylene：679.77 part；Antistatic agent：88 parts, intensity strengthening agent：219 parts, 0.03 part of anti-blocking agent；Antibacterial matrices：13.2 parts.
Wherein upper epidermis is antiblocking layers, accounts for 56 parts altogether, wherein homopolypropylene：55.97 parts, 0.03 part of anti-blocking agent；
Sandwich layer accounts for 878 parts altogether, wherein 571 parts of homopolypropylene, intensity strengthening agent：219 parts, 88 parts of antistatic agent.
Layer is antibiotic layer, accounts for 66 parts altogether, wherein 52.8 parts of homopolypropylene, antibacterial matrices：13.2 parts.
Anti-blocking agent of the present invention uses partial size for 1-8 μm of silica, and the antistatic agent is by components by weight percent It is formed for 30% monoglyceride and 70% amine ethoxylate, the intensity strengthening agent uses C9 hydrogenated petroleum resin, and the antibacterial matrices use PTK antibacterial agent.
Upper epidermis 1 of the present invention, layer 3 thickness be the 10% of the fresh-keeping BOPP film overall thickness of the micropore.
The preparation method of the fresh-keeping BOPP film of micropore is the same as embodiment 7.
The step of described in the embodiment of the present invention 9. in the laser-beam drilling machine that uses for Ai Sida brand ASIDA-JG23 type Laser-beam drilling machine.
Stiffness of thin film performance reflects the well-pressed degree of film, deformation of thin membrane problem when high-stiffness can improve punching processing；Heat is received Shrinkage reflects dimensional contraction situation under thin film high temperature, and laser boring product high temperature around micropore causes micropore to form after-contraction So that micropore is closed, micropore processing requirement percent thermal shrinkage is the smaller the better；Heat seal strength reflects bond properties after film bag making；It is ventilative Property reflection film micropore processing after atmosphere regulating power, high permeability quickly adjusts gas ratio in packaging bag.
Using the common antistaling film of the prior art as comparative example, stiffness properties survey is carried out to above-described embodiment and comparative example respectively Examination, test equipment are RH-T50 type stiffness of thin film analyzer, and the testing standard of reference is GB/T 22364-2008；
Using the common antistaling film of the prior art as comparative example, respectively above-described embodiment and comparative example be heat-shrinked forthright It can test, test equipment is the forced air oven of ruler and BINDER company, and the testing standard of reference is GB/T 13519- 1992；
Using the common antistaling film of the prior art as comparative example, heat seal strength is carried out to above-described embodiment and comparative example respectively It can test, test equipment is that HSG-C type seals experiment instrument and ASG-X 0-1000N type universal tensile testing machine, the test of reference Standard is GBT 12026-2000；
Using the common antistaling film of the prior art as comparative example, permeability survey is carried out to above-described embodiment and comparative example respectively Examination, test equipment are pressure differential gas permeameter, and the testing standard of reference is GB/T1038-2000；
Specific test result is shown in Table 1；
Using the common antistaling film of the prior art as comparative example, in 25 DEG C of temperature, the laboratory with constant temperature and constant humidity condition of humidity 50% Under, above-described embodiment and comparative example are distinguished into bag making packaging fresh banana, test each group to rotten required time, specific test knot Fruit is shown in Table 2.
The fresh-keeping BOPP film of 1 micropore of table and common antistaling film performance test data
Stiffness（mN） Percent thermal shrinkage（%） Heat seal strength（N/15mm） Air permenbility（cm3/m2·day·bar）
Comparative example 2.48 3.82 2.4 16
Embodiment 1 5.06 1.44 4.2 1345
Embodiment 2 5.08 1.45 4.1 1350
Embodiment 3 5.11 1.51 4.3 1348
Embodiment 4 5.12 1.34 5.6 4500
Embodiment 5 5.03 1.38 4.9 4706
Embodiment 6 5.07 1.40 5.1 4628
Embodiment 7 5.07 1.41 4.1 8700
Embodiment 8 5.11 1.40 4.3 8534
Embodiment 9 5.09 1.44 4.2 8690
The fresh-keeping BOPP film of 2 micropore of table and common antistaling film fresh-keeping effect test data
Comparative example Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6 Embodiment 7 Embodiment 8 Embodiment 9
Fresh-keeping duration（It） 3 6 6 6 8 8 8 10 10 10
Data can be seen that the fresh-keeping BOPP film of micropore of the present invention and the common antistaling film phase of the prior art from above-mentioned table Than stiffness of thin film is that 2 times of the prior art are had a surplus, and percent thermal shrinkage reduces 62-65% than the prior art, and heat seal strength is existing 1.7-2.3 times of technology, Air permenbility are 84-543 times of the prior art；The fresh-keeping BOPP film of micropore of the present invention it is fresh-keeping when it is a length of 2-3.3 times of the common antistaling film of the prior art.
By above-mentioned data it is found that the stiffness of the fresh-keeping BOPP film of micropore of the present invention, heat resistance, heat seal strength, gas permeability, guarantor Fresh effect, which all has, to be significantly improved, and has significant creative feature.
The beneficial effects of the invention are as follows：
1. punching processing by membrane laser improves the gas permeability of BOPP film, the gas diffusion that interior fruits and vegetables generate will be packed It goes out, adjusts atmosphere and keep oxygen and carbon dioxide ratio consistent with the external world, reduce ethyl alcohol and acetaldehyde gas that anaerobic respiration generates Body influences flavor；The steam that breathing generates is volatilized away by micropore simultaneously, bacteria breed breeding is reduced, extends preserving fruit and vegetable utilizing Phase；
2. polypropylene material is shunk at high temperature due to generating high fever in laser drilling process, cause hole that can reduce even It disappears, while being formed around micropore and burning side phenomenon, the present invention is improved by adjusting the technological parameters such as draw ratio, intensity strengthening agent being added Film shrink performance, so that membrane laser punching processing back aperture uniformity reduces without diminution and burns side phenomenon, gas permeability is steady It is fixed；Big for respiratory intensity, washy packaging product, internal layer add the antibacterial agent for meeting food contact requirements, further subtract Few bacteria breed, Shelf-life；
3. film additive is nontoxic, food can be directly contacted, has transparency, surface gloss high, surface prints The good feature of brushing effects；
4. simplifying processing technology without techniques such as compound, laminations in manufacturing process；
5. punching compared to existing machinery pin hole, the present invention has micropore spacing and adjustable, pore-free defect torn edges etc. Advantage has good gas permeability and mechanical property, can be according to the different designs different pore size of packing material breathing characteristic, density Micropore, to achieve the purpose that long acting fresh-keeping.

Claims (9)

1. a kind of fresh-keeping BOPP film of micropore, including upper epidermis（1）, sandwich layer（2）, layer（3）, the sandwich layer（2）Upper surface Upper epidermis is set（1）, sandwich layer（2）Layer is arranged in lower surface（3）, which is characterized in that the upper epidermis（1）For antiblocking layers, The upper epidermis（1）And layer（3）Surface is evenly arranged with the micropore as made from laser boring of preset quantity（4）, institute State micropore（4）Aperture is 10-40um, the micropore（4）30-150/cm of density2, the sandwich layer（2）It is 3- by parts by weight 10 parts of antistatic agent, 20-25 parts of intensity strengthening agent and 65-77 parts of homopolypropylene composition.
2. the fresh-keeping BOPP film of micropore according to claim 1, which is characterized in that the layer（3）It is set as anti-sticking Even layer.
3. the fresh-keeping BOPP film of micropore according to claim 1 or 2, which is characterized in that the antiblocking layers are by parts by weight Number uses partial size for 1- for 99.8-99.95 parts of homopolypropylene and 0.05-0.2 parts of anti-blocking agent compositions, the anti-blocking agent 8 μm of silica.
4. the fresh-keeping BOPP film of micropore according to claim 1, which is characterized in that the layer（3）It is set as sealing Layer, the heat-sealing material and 0.05-0.2 parts of anti-blocking agent that the hot sealing layer is 99.8-99.95 parts by parts by weight form, described Heat-sealing material uses ternary polymerized polypropylene, and the anti-blocking agent uses partial size for 1-8 μm of silica.
5. the fresh-keeping BOPP film of micropore according to claim 1, which is characterized in that the layer（3）It is set as antibacterial Layer, the antibiotic layer are that 50-80 parts of homopolypropylene and 20-50 parts of antibacterial matrices form by parts by weight, the antibacterial Master batch uses PTK antibacterial agent.
6. the fresh-keeping BOPP film of micropore according to claim 1, which is characterized in that the antistatic agent is by parts by weight 10-50 parts of monoglyceride and 50-90 part amine ethoxylate composition, the intensity strengthening agent use C9 hydrogenated petroleum resin.
7. the fresh-keeping BOPP film of micropore according to claim 1, which is characterized in that the upper epidermis（1）, layer（3） Thickness be the fresh-keeping BOPP film overall thickness of the micropore 5-10%.
8. a kind of preparation method of such as fresh-keeping BOPP film of the described in any item micropores of claim 1-7, which is characterized in that including Following steps：
1. respectively according to the sandwich layer（2）, upper epidermis（1）, layer（3）Parts by weight weigh raw material；
2. by sandwich layer（2）, upper epidermis（1）, layer（3）Respective squeeze is added in dry materials used in each layer after mixing respectively Out in machine, material fusion plastification in an extruder, extruder temperature is at 230-250 DEG C；
Converge 3. three kinds of materials after fusion plastification squeeze out at die head, is made 2-3mm sheet, 250 DEG C of die head temperature；
4. sheet carries out cooling slab by fitting chilling roller and sink, chilling roller temperature is at 30-40 DEG C；
5. slab is in the area Zong La by carrying out longitudinal drawings by 5 times of stretching ratios at 130-140 DEG C preheating, stretching, sizing of region It stretches；
The area ⑥Heng La is by carrying out lateral drawings by 8 times of stretching ratios at preheating, stretching, sizing, 150-180 DEG C of cooled region It stretches；
7. the film by gradually biaxial tension is wound through cooling, traction flattening, winder to get parent roll；
8. specification cuts into the finished films that width is 1400-2200mm to parent roll as required after 48 hours timeliness；
9. laser boring：Finished films volume is placed on laser-beam drilling machine and continuously traction unreels, film is worn and passes sequentially through punching Downhole parameter is arranged by computer end according to the aperture of BOPP film and pore density demand in processor, nip rolls and rolling frame Spot diameter and trepanning velocity carry out laser boring, and micropore is made and handles film roll；The spot diameter is 10-40um, described to beat Hole speed is the hole 250-1150/s.
9. the preparation method of the fresh-keeping BOPP film of micropore according to claim 8, which is characterized in that the step 9. in swash The laser power that light puncher uses is 200W, optical maser wavelength 1064nm, transmission speed 60m/min.
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