CN102303436B - Thinning lightweight packaging material and preparation method thereof - Google Patents
Thinning lightweight packaging material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a thinning lightweight packaging material and a preparation method thereof. The packaging material comprises a PET (Polyethylene Terephthalate) polyester film layer, a functional polyethylene film layer and a polypropylene and polyethylene co-extruded and blended film layer from outside to inside, respectively. Compared with the prior art, the invention has the following advantages of: (1) clear and bright appearance, good effect on shelves and capability of improving product grades; (2) low temperature, short heat-sealing time, high sealing strength and capability of reducing packaging cost; (3) small friction coefficient, applicability for modern rapid automatic packaging equipment, fast packaging speed and high efficiency; (4) high performance and good weather resistance; (5) low-temperature heat-sealing formula; the heat-sealing temperature of the ordinary packaging material for washing powder is 120-130 DEG C, and the heat-sealing temperature of the thinning lightweight packaging material disclosed by the invention can be controlled at 100-110 DEG C; and (6) on the premise of improving the performance, the weight per unit and the produced quantity of the wastes are reduced and the trend to thinning, lightweight and multifunctional packaging is realized.
Description
Technical field
The invention belongs to packaging material and preparation method thereof, belong to especially Thinned light-weight packaging material and preparation method thereof.
Background technology
Along with the lifting of people's quality of life, the demand of articles for washing is constantly increased, driven the prosperity and development in articles for washing market.Articles for washing has become the necessary article of people's daily life, and washing powder has especially entered each family as the cosmetics of everyday use of quick consumption, and everyone is very familiar to this.The sales volume of articles for washing class commodity also significantly increases, existing washing-powder packing material is 12PET/100PE from outside to inside, the initial heat-sealing temperature of above-mentioned thin material is 120-130 ℃, in packaging process, energy consumption is higher relatively, simultaneously, the gross thickness of material reaches 112um, serious waste social resources.
Summary of the invention
First technical problem to be solved by this invention is to provide a kind of requirement that meets green that national industry development proposes, environmental protection low-carbon (LC), environmentally friendly, sustainable development, and performance reaches and requires equally material thickness attenuate more than 30%, environmental protection Thinned light-weight packaging material that initial heat-sealing temperature is low.
The 2nd technical problem to be solved by this invention is the preparation method of above-mentioned packaging material.
The technical scheme of technical solution problem of the present invention is: Thinned light-weight packaging material, is respectively PET laminated polyester film, functional form film layer, polypropylene and polyethylene blend coextruded film layer from outside to inside.
Preferred Thinned light-weight packaging material is 12umPET laminated polyester film/20um function film layer/40um polypropylene and polyethylene blend coextruded film from outside to inside.
Described function film layer comprises hp-ldpe material and the blend of metallocene low-density polyethylene material, and ratio is 1: 3-4;
Described polypropylene and polyethylene blend coextruded film layer are divided into corona layer, intermediate layer, hot sealing layer from outside to inside,
Described corona layer comprises copolymerized type propene polymer, metallocene linear-low density polyethylene, low density polyethylene (LDPE), processing aid; Copolymerized type propene polymer, metallocene linear-low density polyethylene, low density polyethylene (LDPE), the weight ratio of processing aid is 10: 2-3: 0.5-0.8: 0.05-0.08
Described intermediate layer comprises high density polyethylene (HDPE), metallocene PE LLDPE, low density polyethylene (LDPE), white mother, processing aid, and high density polyethylene (HDPE), metallocene PE LLDPE, low density polyethylene (LDPE), white weight ratio female, processing aid are 10: 8-12: 8-12: 5-8: 0.05-0.08;
Described hot sealing layer comprises metallocene linear-low density polyethylene, LLDPE, low density polyethylene (LDPE), slipping agent, opening agent, metallocene linear-low density polyethylene, LLDPE, low density polyethylene (LDPE), the weight ratio of slipping agent, opening agent is 10: 8-12: 8-12: 0.5-0.8: 0.05-0.08;
The molten finger of described copolymerized type propene polymer is 2.2 (g/10min), 122 ℃ of Vicat softening points, and fusing point is 138 ℃.
Preparation method of the present invention is:
1) printing process: PET film is carried out to colored multicolour photogravure by gravure printing apparatus;
2) polypropylene and polyethylene blend coextruded film layer preparation section: the material of the material in the material of corona layer, intermediate layer, hot sealing layer is added respectively in three hoppers of three-layer co-extruded film blow molding machine group (M3B-1300Q), carry out blown film;
3) extrude compound working procedure: by the PET film printing surface printing and polypropylene-polyethylene blend coextruded film corona interlayer by extruding the operation of fitting of the compound mode of function film layer, thereby obtain multi-layer compound package material.
Described compound speed of a motor vehicle 120-200m/min, drying tunnel temperature: 70-80 ℃, extrusion temperature: 280-330 ℃, the doubling roller pressure 4-5kg/cm of extruding
2.
4) curing step: composite membrane is put into curing chamber, at 40-45 ℃ of slaking 24-36 hour;
5) divide cutting process: according to the required different in width of consumer packaging, length, specification, compound good packaging material are cut into roll of material, to adapt to the requirement of user's automatic packaging machinery.The length and width specification of cutting roll of material should be in strict conformity with customer requirement, end face flatness≤2mm, and layout position is without skew, and the calm space of a whole page of joint coincide
6) bag operation: connect the roll of material that minute cuts by three side sealing bag machines, make the finished bag of three bandings by client's dimensional requirement.
General packaging material on automated packaging equipment packaging speed 40-50 bag/minute, surpass this speed deviation phenomenon easily occur, cursor cannot be followed the tracks of by electric eye, packing cannot be carried out.Through test of many times, we find: A: laterally sideslip depends primarily on coefficient of friction (COF), and the little sideslip of COF is large, and COF greatly causes that to walk material not smooth, and it is 0.35 ± 0.05 most suitable that COF is controlled at.B: longitudinally sideslip depends primarily on the thickness uniformity and the flatness of material, and during thickness deviation≤± 6%, material could be realized smooth and easy operation on packaging facilities.Therefore 1. must accurately control stable coefficient of friction; 2. must control the good thickness uniformity;
In order to obtain stable coefficient of friction:
The first step: control slipping agent and add total amount, tentatively regulate and control stable friction factor;
Second step: by improving combined producing tech, further control the coefficient of friction of attenuate environmental protection lightweight packaging material.The size of coefficient of friction and stability and material at the speed of a motor vehicle of compound tense, drying tunnel temperature, the pressure of dandy roll, performance, curing time and the curing temperature of internal layer base material have close relationship.Optimum compound speed of a motor vehicle 130m/min, drying tunnel temperature is: 70 ℃ of first paragraphs, 75 ℃ of second segments, the 3rd section 80 ℃, dandy roll pressure 4-5kg/cm2.
The 3rd step: control slaking processing temperature, time, the stability of accuracy controlling coefficient of friction.Conventionally flexible package producer only considers that slipping agent adds total amount and controls coefficient of friction, and ignores the impact of follow-up slaking processing temperature time on coefficient of friction.In fact, composite inner slipping agent along with the difference of curing temperature, time can be in various degree migration, thereby change internal layer coefficient of friction, as composite (slipping agent total amount 1500ppm), curing time is 36H, when curing temperature is 45 ℃, coefficient of friction presents on automatic packaging machine walks materials behavior preferably.
The PETG thin material (PET thin material) that the present invention is used, this thin material has that excellent transparency brightness, tensile strength are high, excellent heat resistance, moderate barrier property, is applicable to the requirement of (being greater than 200m/min) polychrome printing at a high speed, high speed compound processing.
The function PE layer (bonding anti-impacting layer) of extruding of the present invention adopts after hp-ldpe material and the blend of metallocene low-density polyethylene material, through Extrusion Coating equipment availability, play the object of bonding PET and PP & PE, impact and have good cushioning effect to external world.
In polypropylene of the present invention and polyethylene blend co-extrusion thin-material layers, because PP particle and PE are the master batches of two kinds of different qualities, PP particle adopts curtain coating technology conventionally, the common film-blowing process of PE particle, after the two is mixed, very easily occur: 1) cannot normally produce, cause equipment damage; 2) thin material of producing has serious light and shade striped, and brilliant point is serious; 3) thickness deviation is very large, and thin material cannot be used, and all scraps.4) material bubble shakiness highlights, and material deflection is too high, easily crisp, the problem that mechanical performance declines.
Therefore for PP and PE well being merged and can normally adopting, blow material technology production, inventor, by constantly groping repetition test, searches out good solution finally, and its mechanism is as follows:
1) PP type selecting: according to the similar principle that mixes, select the PP particle of copoly type.Because the PP of copoly type is ethylene-propylene copolymer, a small amount of vinyl group (1-5%) is contained in inside, with the blend of PE particle after can have good amalgamation; And the PP particle of homopolymerization type, internal structure is entirely the polymerization of propylene, there is no identical point with PE, and when physical blending, amalgamation is bad.
2) selection of PP fusing point: after having determined that PP is copoly type PP, because the fusing point of PE is relatively low, conventionally 120-130 ℃ of left and right, and most PP fusing point is all more than 150 ℃, and when fusing point differs larger, two kinds of particles cannot normally merge.At certain production temperature, the PE master batch of low melting point is complete oxidation, and dystectic PP master batch does not even also reach molten condition.Unstable the highlighting of material bubble blowing out in this case, deflection is too high, and under this state, the thin material of producing will form a large amount of brilliant points, coke button, and also fold is serious, cannot normally use.
3) the molten selection referring to of PP: molten refer to i.e. " melt index ".Refer to that plastics are under uniform temperature and load, melt is the strong and weak embodiment of fluidity of molten by standard mouth mould quality capillaceous or melting volume in every 10 minutes.The resin certain to chemical constitution, its melt index is less, and molecular weight is just larger, and the performance such as its fracture strength, hardness, toughness, ageing-resistant stability all increases.And melt index is large, molecular weight is just little, and mobility during moulding is just corresponding better.Common PE master batch, its molten 1-3g/10min/2.16kg that refers to, we are to select molten finger near selecting PP master batch, mobility is relatively better.The PP of molten finger close (numerical value 2-4g/10min/2.16kg) and PE, in blending extrusion process, can produce more uniform extrusion pressure.Otherwise, if molten, refer to differ larger, Screw Extrusion pressure transient, the thin material forming has larger thickness deviation.
The present invention compared with prior art, is composited by the function base material thin material of three layers of different performance: ground floor is PET thin-material layers; The second layer is for extruding the bonding anti-impacting layer of function PE; The 3rd layer is blown material layer for crucial heat-sealable material layer PP & PEE blend co-extrusion.There is following characteristics
(1) clear patterns, outward appearance are beautiful, have good shelf effect, can improve product specification;
(2) rise envelope temperature low, the heat-sealing time is short, sealing-strength is high, can reduce packing cost.
(3) lower coefficient of friction, adapts to the fast automatic packaging facilities of modernization, and packaging speed is fast, and efficiency is high.
(4) security performance is high, good weatherability;
(5) on keeping the basis of original material structure 12PET//100PE (before material attenuate) physical and mechanical properties, reduced thickness 30% left and right, cost reduced by 20% more originally.
(6) adopt low-temperature heat-sealing formula, the heat-sealing temperature of common washing-powder packing material is at 120-130 ℃, and the heat-sealing temperature of attenuate environmental protection lightweight packaging material of the present invention can controlled 100-110 ℃.Excellent low-temperature heat-sealing packing effect can be energy-saving and cost-reducing 15% left and right of client in packing link.
(7) meet the requirement of plastic package material to ambient adaptability.Can carry under high performance prerequisite, alleviate Unit Weight and generation of waste materials amount, realize minimizing, lightweight and multi-functional packing trend.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Fig. 2 is process chart of the present invention.
Fig. 3 is the graph of a relation of coefficient of friction and curing time.
In Fig. 1,1 is PET laminated polyester film, and 2 is that function film layer, 3 is polypropylene and polyethylene blend coextruded film layer.
The specific embodiment
The present invention's material used is as follows:
1.1 PETGs (PET)
1.2 function PE layers (bonding anti-impacting layer):
1.3 polypropylene and polyethylene blend co-extrusion are blown material layer:
100991-k is produced by Thailand peace color matching company.
Embodiment 1:
1) printing process:, between 20-30 ℃, PET thin material is carried out to colored printing by printing machine,
2) polypropylene and polyethylene blend co-extrusion thin-material layers preparation section: the material of the material in the material of corona layer, intermediate layer, hot sealing layer is respectively charged in three hoppers of three-layer co-extruded thin material blowing unit (M3B-1300Q), blows material;
Corona layer: 75KgRC1314 (co-PP); 20KgSP1520; 5Kg150BW; 0.5Kg100991-k
Intermediate layer: 25KgF920A; 25Kg1018FA; 25Kg2426H; The female F501 of 18Kg white; 0.2Kg100991-k;
Hot sealing layer: 25Kg Yanshan Mountain 100AC; 25Kg1002KW; 25Kg5100G; 1.8KgSE07PE; 1KgAB-20LD; 0.2Kg100991-k
Outer: RC1314 (co-PP) is copoly type PP, in the indexs such as fusing point and molten finger, there is good amalgamation with PE.SP1520 is the MLLDPE of 6C, because metallocene PE and PP material have good comixing compatibility, this layer is as corona layer, and be added on is mainly in extrusion process, to provide good peel strength for whole composite herein.150BW is that LDPE is low density polyethylene (LDPE), is added on herein, and Main Function is the processing characteristics of improving between RC1314 (co-PP) and SP1520, guarantees the smooth of production process.100991-k is processing aid, can not affect bonding, printing and the heat sealability of goods after interpolation, also can not affect the physical property of resin itself, after interpolation, can improve polyolefinic processing characteristics.Because MMLDPE viscosity is larger, easily adhere to the inwall of screw rod and machine barrel, we have added a small amount of processing aid.Processing aid addition is many, can affect and extruding layer between peel strength; Amount is few, does not have and should have effect.Therefore in the control of addition, we have carried out test of many times: finally determine that addition is 5%.
Intermediate layer F920A is HDPE, and high density polyethylene (HDPE), for this intermediate layer, can coordinate PP particle to play the action effect of strengthening thin material deflection.1018FA is metallocene PE (MLLDPE), is added in this layer, plays the elongation at break that strengthens thin material, improves thin material pliability, is difficult for causing the situation of bale broken and leakage.2426H is low density polyethylene (LDPE) (LDPE), and the effect in this layer is the processing characteristics of improving after HDPE and MLLDPE blend.F501 is that white is female, after it adds, can reduce the use of printing chalk, makes thin material be a kind of effect of white ink printing.100991-k processing aid, principle is with outer.
Hot sealing layer: this layer, as hot sealing layer, is necessary for client good heat seal strength and lower heat-sealing temperature are provided.In the selection of batching, we have chosen metallocene PE raw material (MLLDPE) 5100G with excellent low-temperature heat-sealing performance; But this kind of cost of material is higher, do not affecting under the prerequisite of heat-sealing effect, in order to reduce costs, we have added 1002KW, and this is LLDPE (LLDPE), plays the object of auxiliary heat-sealing effect.But these two kinds of particle viscosity are all larger, processing is easily to cling screw rod and die head, therefore, we have added 100AC simultaneously, this is low density polyethylene (LDPE) (LDPE), can play the viscosity while reducing MLLDPE and LLDPE production after interpolation, thereby guarantees normal production.SE07PE is slipping agent, can control coefficient of friction, and AB-20LD is opening agent, has guaranteed preferably the opening of sack, 100991-k processing aid, and principle is with outer.
3) extrude compound working procedure: one puts: good PET film to be printed, through cable roll, is evenly coated with to special-purpose one-component polyurethane adhesive (Henkel UK4501), dry through heating drying tunnel; Two put: polypropylene and polyethylene blend coextruded film are unreeled, simultaneously, the mixing melt material of extruding LDPE 1C7A and SP1071C from die head die orifice is coated with to squeeze and is evenly distributed on substrate surface, by one put through heating the PP & PE coextruded film that the PET printing film and two of big vast road drying process puts, extrude compound, under the effect of dandy roll pressure hot melt material with treat that complex radical material is combined with each other, after chill roll cooling and shaping, excision, will extrude composite and be around on rolling refill;
Described compound speed of a motor vehicle 130m/min, drying tunnel temperature: 70 ℃ of first paragraphs, 75 ℃ of second segments, the 3rd section 80 ℃, dandy roll pressure 4-5kg/cm2.
The weight ratio of LDPE 1C7A and SP1071C is 1: 3;
As shown in Figure 1, made composite membrane is 12umPET laminated polyester film 1/20um function film layer 2/40um polypropylene and polyethylene blend coextruded film 3 from outside to inside.
4) curing step: composite membrane is put into curing chamber.Curing time is 36 hours, when curing temperature is 45 ℃.Experience shows, the composite membrane after this kind of slaking, and coefficient of friction presents on automatic packaging machine walks membrane stage preferably.Coefficient of friction and curing time are referring to Fig. 3.
5) divide cutting process: according to the required different in width of consumer packaging, length, specification, compound good packaging material are cut into roll of material, to adapt to the requirement of user's automatic packaging machinery.The length and width specification of cutting roll of material should be in strict conformity with customer requirement, end face flatness≤2mm, and layout position is without skew, and the calm space of a whole page of joint coincide.
6) bag operation: connect the roll of material that minute cuts by three side sealing bag machines, make the finished bag of three bandings by client's dimensional requirement.
Embodiment 2:
Except 2) polypropylene and polyethylene blend co-extrusion thin-material layers preparation section: in,
Corona layer: 65KgRC1314 (co-PP); 25KgSP1520; 7Kg150BW; 0.5Kg100991-k
Intermediate layer: 25KgF920A; 30Kg1018FA; 30Kg2426H; The female F501 of 15Kg white; 0.3Kg100991-k;
Hot sealing layer: 25Kg Yanshan Mountain 100AC; 30g1002KW; 30Kg5100G; 1.5KgSE07PE; 0.8KgAB-20LD; 0.3Kg100991-k;
3) extrude in compound working procedure,
The weight ratio of LDPE 1C7A and SP1071C is 1: 3
Outward, all the other are identical with embodiment 1.
Embodiment 3:
Except 2) polypropylene and polyethylene blend co-extrusion thin-material layers preparation section: in,
Corona layer: 70KgRC1314 (co-PP); 30KgSP1520; 30Kg150BW; 0.8Kg100991-k
Intermediate layer: 25KgF920A; 35Kg1018FA; 38Kg2426H; The female F501 of 22Kg white; 0.3Kg100991-k;
Hot sealing layer: 30Kg Yanshan Mountain 100AC; 25Kg1002KW; 30Kg5100G; 2.0KgSE07PE; 1.5KgAB-20LD; 0.4Kg100991-k;
3) extrude in compound working procedure,
The weight ratio of LDPE 1C7A and SP1071C is 1: 3.5
Outward, all the other are identical with embodiment 1.
The technical indicator of embodiment 1-3 is as follows:
Claims (5)
1. Thinned light-weight packaging material, is characterized in that: be 12umPET laminated polyester film/20um function film layer/40um polypropylene and polyethylene blend coextruded film from outside to inside;
Described function film layer comprises hp-ldpe material and the blend of metallocene low-density polyethylene material, and ratio is 1:3-4;
Described polypropylene and polyethylene blend coextruded film layer are divided into corona layer, intermediate layer, hot sealing layer from outside to inside;
Described corona layer comprises copolymerized type propene polymer, metallocene linear-low density polyethylene, low density polyethylene (LDPE), processing aid; Copolymerized type propene polymer, metallocene linear-low density polyethylene, low density polyethylene (LDPE), the weight ratio of processing aid is 10:2-3:0.5-0.8:0.05-0.08.
2. Thinned light-weight packaging material according to claim 1, it is characterized in that: described intermediate layer comprises high density polyethylene (HDPE), metallocene linear-low density polyethylene, low density polyethylene (LDPE), white mother, processing aid, high density polyethylene (HDPE), metallocene linear-low density polyethylene, low density polyethylene (LDPE), white weight ratio female, processing aid are 10:8-12:8-12:5-8:0.05-0.08.
3. Thinned light-weight packaging material according to claim 1, it is characterized in that: described hot sealing layer comprises metallocene linear-low density polyethylene, LLDPE, low density polyethylene (LDPE), slipping agent, opening agent, metallocene linear-low density polyethylene, LLDPE, low density polyethylene (LDPE), the weight ratio of slipping agent, opening agent is 10:8-12:8-12:0.5-0.8:0.05-0.08.
4. Thinned light-weight packaging material according to claim 1, is characterized in that: the molten finger of described copolymerized type propene polymer is 2.2g/10min, 122 ℃ of Vicat softening points, and fusing point is 138 ℃.
5. the preparation method of Thinned light-weight packaging material claimed in claim 1 is:
1) printing process: PET film is carried out to colored multicolour photogravure by gravure printing apparatus;
2) polypropylene and polyethylene blend coextruded film layer preparation section: the material of the material in the material of corona layer, intermediate layer, hot sealing layer is added respectively in three hoppers of three-layer co-extruded film blow molding machine group (M3B-1300Q), carry out blown film;
3) extrude compound working procedure: by the PET film printing surface printing and polypropylene-polyethylene blend coextruded film corona interlayer by extruding the operation of fitting of the compound mode of function film layer, thereby obtain multi-layer compound package material;
Described compound speed of a motor vehicle 120-200m/min, drying tunnel temperature: 70-80 ℃, extrusion temperature: 280-330 ℃, the doubling roller pressure 4-5kg/cm of extruding
2;
4) curing step: composite membrane is put into curing chamber, at 40-45 ℃ of slaking 24-36 hour;
5) divide cutting process: according to the required different in width of consumer packaging, length, specification, compound good packaging material are cut into roll of material, to adapt to the requirement of user's automatic packaging machinery, the length and width specification of cutting roll of material should be in strict conformity with customer requirement, end face flatness≤2mm, layout position is without skew, and the calm space of a whole page of joint coincide;
6) bag operation: connect the roll of material that minute cuts by three side sealing bag machines, make the finished bag of three bandings by client's dimensional requirement.
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| CN104029452A (en) * | 2014-05-21 | 2014-09-10 | 江苏优珀斯材料科技有限公司 | HDPE (high-density polyethylene) coloured film for increasing friction coefficient |
| CN107933039A (en) * | 2017-11-02 | 2018-04-20 | 湖北德威包装科技有限公司 | A kind of high tenacity paper handkerchief film and preparation method thereof |
| CN108673989A (en) * | 2018-05-21 | 2018-10-19 | 黄山永新股份有限公司 | A kind of high-barrier transparency film and its production method suitable for High-Speed Automatic packaging |
| CN110126411B (en) * | 2019-05-10 | 2021-03-16 | 爱索尔（广州）包装有限公司 | Film and preparation method and application thereof |
| CN110216904B (en) * | 2019-06-11 | 2021-06-18 | 青岛源欣兴新材料科技有限公司 | Preparation method of environment-friendly automatic coating film |
| CN111845015A (en) * | 2020-07-16 | 2020-10-30 | 安徽紫金新材料科技股份有限公司 | Thinning and preparation method of heavy packaging material |
| CN112208178B (en) * | 2020-10-27 | 2022-11-04 | 河北方大包装股份有限公司 | Polyolefin film for express bubble bag and preparation method thereof |
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| CN101531264A (en) * | 2009-04-20 | 2009-09-16 | 黄山永新股份有限公司 | Milk powder packing bag and preparing method thereof |
| CN101624112A (en) * | 2009-08-14 | 2010-01-13 | 黄山永新股份有限公司 | Composite membrane for sauce and preparation method thereof |
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