CN103059402B - A form-fill- seal (FFS) single layer heavy-duty film and a preparation method thereof - Google Patents
A form-fill- seal (FFS) single layer heavy-duty film and a preparation method thereof Download PDFInfo
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Abstract
The present invention relates to the technical field of packaging film, and concretely relates to a form-fill- seal (FFS) single layer heavy-duty film and a preparation method thereof. The single layer heavy-duty film is composed of 30-50% of metallocene linear low density polyethylene, 5-20% of an ethylene-vinyl acetate copolymer, 5-20% of ultra low density polyethylene, 20-50% of linear low density polyethylene, and 3-5% of masterbatch, and is obtained via blending in a single screw extruder, and processes of extrusion molding via a machine head, traction, cooling, winding, and printing. Compared with the prior art, the single layer heavy-duty film of the present invention optimizes product formulation, has good tensile strength, impact strength and tear strength; in the preparation process, a gradual cooling mode is adopted, so the resulting product is more stable in performance; and aids are not added in the raw materials, so the product is low in cost and has a good market prospect.
Description
Technical field
The present invention relates to packing film technical field, be specifically related to a kind of FFS individual layer multilayer packing membrane and preparation method thereof.
Background technology
FFS multilayer packing membrane is that one realizes the continuity " new packaging material of the multiple working procedures such as shaping, filling-sealing (Form-Fill-Seal; be called for short " FFS "); its capacity packing can reach 1700 ~ 1900 bags/hour; the high speed that can meet scale operation pack-thread is loaded, large-scale accumulating and automatic stacking, thus has broad application prospects once automatically.In recent years, FFS multilayer packing membrane industry development was swift and violent, and the Novel heavy packing film of three layers or more multi-layered number is also constantly released.
But, the coextrusion of production multilayer multilayer packing membrane takes up space greatly, high to the requirement of factory building and manning, high to device control accuracy requirement, the production unit of the multilayer multilayer packing membrane of a better performances is greatly about more than 5,000,000, import equipment even reaches more than 1,000 ten thousand, overall investment is very large thus, it is long that cost steams again the time, requirement is grasped to business capital very high, and for the small-sized manufacturing enterprise of some fund weaknesses, the expense of general individual layer multilayer packing membrane equipment is less than 500,000, there is the advantage that cost is low, therefore, individual layer multilayer packing membrane for performance high-quality still has wide market outlook.
In prior art, monolayer package film ubiquity heat sealability is poor, frictional coefficient is unstable and the more high many defects of broken rate, usually can use a large amount of auxiliary agents, thus cause cost high for reaching comparatively ideal result of use.
Therefore, for the deficiencies in the prior art, need badly and a kind of stable performance is provided, intensity is high, heat sealability good and FFS individual layer multilayer packing membrane that cost is low and preparation method thereof.
Summary of the invention
An object of the present invention be to avoid weak point of the prior art and a kind of stable performance is provided, intensity is high, heat sealability good and the FFS individual layer multilayer packing membrane that cost is low.
The preparation method of the FFS double-layer heavy packing film that two of object of the present invention is to avoid weak point of the prior art and provides a kind of preparation technology simple, cost-saving, the individual layer multilayer packing membrane adopting this preparation method to produce has stable performance, intensity is high, heat sealability good and the advantage that cost is low.
Object of the present invention is achieved through the following technical solutions:
A kind of FFS individual layer multilayer packing membrane is provided, is made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 30 ~ 50%;
Ethylene-vinyl acetate copolymer 5 ~ 20%;
Ultra-low density polyethylene 5 ~ 20%;
LLDPE 20 ~ 50%;
Masterbatch 3 ~ 5%;
The melting means of described metallocene linear low density polyethylene is 0.5 ~ 2.5g/10min, and density is 0.9 ~ 0.93 g/cm
3;
The melting means of described ethylene-vinyl acetate copolymer is 0.2 ~ 3g/10min, and density is 0.91 ~ 0.95 g/cm
3;
The melting means of described ultra-low density polyethylene is 0.2 ~ 3g/10min, and density is 0.88 ~ 0.92 g/cm
3;
The melting means of described LLDPE is 0.5 ~ 2.5g/10min, and density is 0.9 ~ 0.93 g/cm
3.
preferably,described FFS individual layer multilayer packing membrane is made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 36 ~ 50%;
Ethylene-vinyl acetate copolymer 10 ~ 20%;
Ultra-low density polyethylene 5 ~ 10%;
LLDPE 25 ~ 40%;
Masterbatch 3 ~ 5%.
preferably,described FFS individual layer multilayer packing membrane is made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 50%;
Ethylene-vinyl acetate copolymer 10%;
Ultra-low density polyethylene 10%;
LLDPE 25%;
Masterbatch 5%.
preferably,described FFS individual layer multilayer packing membrane is made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 40%;
Ethylene-vinyl acetate copolymer 10%;
Ultra-low density polyethylene 10%;
LLDPE 35%;
Masterbatch 5%.
preferably,described FFS individual layer multilayer packing membrane is made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 36%;
Ethylene-vinyl acetate copolymer 15%;
Ultra-low density polyethylene 5%;
LLDPE 40%;
Masterbatch 4%.
the invention provides the preparation method of above-mentioned FFS individual layer multilayer packing membrane,comprise following preparation process:
Step one, raw material are mixing:
The metallocene linear low density polyethylene of above-mentioned formula ratio, ethylene-vinyl acetate copolymer, ultra-low density polyethylene, LLDPE and Masterbatch are added into single screw extrusion machine mixing, screw diameter is 45 ~ 75mm, screw speed is 40 ~ 100rpt/min, temperature is 150 ~ 190 DEG C, pressure is 30 ~ 50MPa, obtains fluidized mixture;
Step 2, extrusion moulding:
1) fluidized mixture prepared by step one is delivered to head, under temperature is 170 ~ 220 DEG C of conditions, carries out fusion and extrude, then be the cooling air of 10 ~ 20 DEG C through temperature, inflation forms film bubble, in said process, controlling blow-up ratio is 1.5 ~ 2.5, and head die gap is 1.5 ~ 2.5mm;
2) film bubble through film bubble internal cooling wind and film bubble exterior cooling air cooling shaping, shaping film bubble is by steady bubble frame stable bubble, again by the diameter of film bubble survey meter 360 degree of wheel measuring film bubbles and the distribution of thickness, and feed back to the adjustment that regulation system completes bubble thickness;
3) film bubble enters swivel mount, carries out the rotation of positive and negative circumference and realizes the positive and negative circumference twisting of film bubble, be distributed to whole film bubble uniformly circumferentially to make bubble thickness;
4) film bubble is pressed into the film bar of flats through collapser;
Step 3, traction:
Film bar feeding haulage gear step 2 obtained carries out traction and is drawn into film, and ratio of drawing is 5 ~ 10,
Step 4, three coolings step by step:
1) first time cooling:
Film after traction being continued through 4 diameters is that the cooling roller of 70 ~ 110mm carries out first time cooling, leads to tap water in cooling roller;
2) second time cooling:
First time cooled film is carried out second time cooling by air cooling cabinet, and the temperature of cooling air is 15 ~ 20 DEG C;
3) third time cooling:
The cooled film of second time being continued through 4 diameters is that the cooling roller of 170 ~ 230 millimeters carries out third time cooling, and leads to water coolant in cooling roller, coolant water temperature is 10 ~ 15 DEG C;
Step 5, rolling:
By third time cooled film by batching after marginal mode correction instrument and static eliminator process, obtain smooth work in-process film volume;
Step 6, print and cut:
Film volume step 5 obtained is delivered to printing press and is unreeled, then after high-frequency spark process, printing, warm air drying, cold air drying, displacement, embossing, insert edge, splitting winding operation, obtains FFS individual layer multilayer packing membrane finished product.
beneficial effect of the present invention:
A kind of FFS individual layer multilayer packing membrane of the present invention, mixing through single screw extrusion machine by 30 ~ 50% metallocene linear low density polyethylenes, 5 ~ 20% ethylene-vinyl acetate copolymers, 5 ~ 20% ultra-low density polyethylenes, 20 ~ 50% LLDPE, 3 ~ 5% Masterbatchs, then make individual layer multilayer packing membrane through operations such as head extrusion moulding, traction, cooling, rolling, printings, compared with prior art, present invention optimizes formula for a product, have employed 5 ~ 20% ultra-low density polyethylenes, packing film is made to possess the tensile strength of height, shock strength and tear strength, and adopt the metallocene linear low density polyethylene of 30 ~ 50%, its broad molecular weight distribution, both good processing characteristics had been shown, physical strength, bubble stability energy in production process and ensure that the integrity that multilayer packing membrane seals, be equipped with ethylene-vinyl acetate more blended, compensate for the defect of ultra-low density polyethylene and high density polyethylene(HDPE) crystalline structure, provide excellent low temperature resistant heat sealability, make the intensity of multilayer packing membrane, toughness and deflection are improved improvement simultaneously, on the other hand, in preparation method of the present invention, film bar still has higher temperature after traction, and be in prepattern state, it is inconsistent that direct chilling easily causes film bar to shrink, affect the size of product, cause obvious deformation of thin membrane warpage, and directly chilling easily makes film bar high-temperature area degree of crystallinity higher than other regions, cause film thickness, there is larger difference in mechanical property and heat sealability, affect the quality of product, and the present invention adopts the mode cooled step by step, close to the natural way of film cooling, product size is stablized, range estimation film is without distortion, the situations such as warpage occur, and film forming thickness, mechanical property and heat sealability do not have difference all substantially, its performance is more stable, moreover do not need in raw material of the present invention to add auxiliary agent, utilize the characteristic of raw material itself to make rete reach the good effect of opening performance, deflection and toughness, thus cost is lower, has good market outlook.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
The multilayer packing membrane of following examples 1 to 3 is for the thickness of 0.14mm, and thickness average deviation is all not more than 6%.
embodiment 1
A kind of FFS individual layer multilayer packing membrane of the present invention, is made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 50%;
Ethylene-vinyl acetate copolymer 10%;
Ultra-low density polyethylene 10%;
LLDPE 25%;
Masterbatch 5%.
Concrete, the melting means of metallocene linear low density polyethylene is 0.5 ~ 2.5g/10min, and density is 0.9 ~ 0.93 g/cm
3;
Metallocene linear low density polyethylene is the polymkeric substance of one or more than one in butylene, hexene or octene and polyvinyl monomer copolymerization.
Concrete, the melting means of ethylene-vinyl acetate copolymer is 0.2 ~ 3g/10min, and density is 0.91 ~ 0.95 g/cm
3;
Concrete, the melting means of ultra-low density polyethylene is 0.2 ~ 3g/10min, and density is 0.88 ~ 0.92 g/cm
3;
Concrete, the melting means of LLDPE is 0.5 ~ 2.5g/10min, and density is 0.9 ~ 0.93 g/cm
3.
embodiment 2
The main technical schemes of the present embodiment is identical with embodiment 1, and difference is: a kind of FFS individual layer multilayer packing membrane of the present invention, is made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 40%;
Ethylene-vinyl acetate copolymer 10%;
Ultra-low density polyethylene 10%;
LLDPE 35%;
Masterbatch 5%.
embodiment 3
The main technical schemes of the present embodiment is identical with embodiment 1, and difference is: a kind of FFS individual layer multilayer packing membrane of the present invention, is made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 36%;
Ethylene-vinyl acetate copolymer 15%;
Ultra-low density polyethylene 5%;
LLDPE 40%;
Masterbatch 4%.
embodiment 4
The preparation method of a kind of FFS individual layer multilayer packing membrane of the present invention, is characterized in that: comprise following preparation process:
Step one, raw material are mixing:
The metallocene linear low density polyethylene of above-mentioned formula ratio, ethylene-vinyl acetate copolymer, ultra-low density polyethylene, LLDPE and Masterbatch are added into single screw extrusion machine mixing, screw diameter is 45 ~ 75mm, screw speed is 40 ~ 100rpt/min, temperature is 150 ~ 190 DEG C, pressure is 30 ~ 50MPa, obtains fluidized mixture;
Step 2, extrusion moulding:
1) fluidized mixture prepared by step one is delivered to head, under temperature is 170 ~ 220 DEG C of conditions, carries out fusion and extrude, then be the cooling air of 10 ~ 20 DEG C through temperature, inflation forms film bubble, in said process, controlling blow-up ratio is 1.5 ~ 2.5, and head die gap is 1.5 ~ 2.5mm;
2) film bubble through film bubble internal cooling wind and film bubble exterior cooling air cooling shaping, shaping film bubble is by steady bubble frame stable bubble, again by the diameter of film bubble survey meter 360 degree of wheel measuring film bubbles and the distribution of thickness, and feed back to the adjustment that regulation system completes bubble thickness;
3) film bubble enters swivel mount, carries out the rotation of positive and negative circumference and realizes the positive and negative circumference twisting of film bubble, be distributed to whole film bubble uniformly circumferentially to make bubble thickness;
4) film bubble is pressed into the film bar of flats through collapser;
Step 3, traction:
Film bar feeding haulage gear step 2 obtained carries out traction and is drawn into film, and ratio of drawing is 5 ~ 10,
Step 4, three coolings step by step:
1) first time cooling:
Film after traction being continued through 4 diameters is that the cooling roller of 70 ~ 110mm carries out first time cooling, leads to tap water in cooling roller;
2) second time cooling:
First time cooled film is carried out second time cooling by air cooling cabinet, and the temperature of cooling air is 15 ~ 20 DEG C;
3) third time cooling:
The cooled film of second time being continued through 4 diameters is that the cooling roller of 170 ~ 230 millimeters carries out third time cooling, and leads to water coolant in cooling roller, coolant water temperature is 10 ~ 15 DEG C;
Step 5, rolling:
By third time cooled film by batching after marginal mode correction instrument and static eliminator process, obtain smooth work in-process film volume;
Step 6, print and cut:
Film volume step 5 obtained is delivered to printing press and is unreeled, then after high-frequency spark process, printing, warm air drying, cold air drying, displacement, embossing, insert edge, splitting winding operation, obtains FFS individual layer multilayer packing membrane finished product.
Concrete, for preventing film surface attract dust, in above-mentioned printing process, static inhibitor is added in printing-ink, not only shorten the time of static inhibitor onset, and because static inhibitor directly sticks to the skin of film, save more than 50% static inhibitor than traditional employing static inhibitor method be directly added in formula, thus reduce cost.
Static inhibitor selects quaternary ammonium salts or alkylphosphonic acid carboxylic acid salt static inhibitor.
In the present embodiment, the formula ratio of above-mentioned steps one adopts the formula ratio of embodiment 1,2 or 3.
performance test
The FFS individual layer multilayer packing membrane adopting the formula ratio of embodiment 1 to 3 to prepare, pack, then carry out fall down test: from 4 meters of eminence any one party to fall 1 time, respectively fall once from 2 meters of eminences, 6 directions, test result is as shown in table 1:
The performance test of table 1. FFS individual layer multilayer packing membrane
Can be obtained by table 1, the performance test results of FFS individual layer multilayer packing membrane of the present invention is all better than by multi-layer co-extruded heavily loaded film/bag industry standard, its tensile strength possessing height, shock strength and tear strength is demonstrated through test repeatedly and practical application, and stable performance, the product with high strength, good friction performance and broad heat-sealing window can be prepared.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although done to explain to the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (5)
1. a FFS individual layer multilayer packing membrane, is characterized in that: be made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 30 ~ 50%;
Ethylene-vinyl acetate copolymer 5 ~ 20%;
Ultra-low density polyethylene 5 ~ 20%;
LLDPE 20 ~ 50%;
Masterbatch 3 ~ 5%;
The melting means of described metallocene linear low density polyethylene is 0.5 ~ 2.5g/10min, and density is 0.9 ~ 0.93 g/cm
3;
The melting means of described ethylene-vinyl acetate copolymer is 0.2 ~ 3g/10min, and density is 0.91 ~ 0.95 g/cm
3;
The melting means of described ultra-low density polyethylene is 0.2 ~ 3g/10min, and density is 0.88 ~ 0.92 g/cm
3;
The melting means of described LLDPE is 0.5 ~ 2.5g/10min, and density is 0.9 ~ 0.93 g/cm
3;
The preparation method of described a kind of FFS individual layer multilayer packing membrane, comprises following preparation process:
Step one, raw material are mixing:
The metallocene linear low density polyethylene of above-mentioned formula ratio, ethylene-vinyl acetate copolymer, ultra-low density polyethylene, LLDPE and Masterbatch are added into single screw extrusion machine mixing, screw diameter is 45 ~ 75mm, screw speed is 40 ~ 100rpt/min, temperature is 150 ~ 190 DEG C, pressure is 30 ~ 50MPa, obtains fluidized mixture;
Step 2, extrusion moulding:
1) fluidized mixture prepared by step one is delivered to head, under temperature is 170 ~ 220 DEG C of conditions, carries out fusion and extrude, then be the cooling air of 10 ~ 20 DEG C through temperature, inflation forms film bubble, in said process, controlling blow-up ratio is 1.5 ~ 2.5, and head die gap is 1.5 ~ 2.5mm;
2) film bubble through film bubble internal cooling wind and film bubble exterior cooling air cooling shaping, shaping film bubble is by steady bubble frame stable bubble, again by the diameter of film bubble survey meter 360 degree of wheel measuring film bubbles and the distribution of thickness, and feed back to the adjustment that regulation system completes bubble thickness;
3) film bubble enters swivel mount, carries out the rotation of positive and negative circumference and realizes the positive and negative circumference twisting of film bubble, be distributed to whole film bubble uniformly circumferentially to make bubble thickness;
4) film bubble is pressed into the film bar of flats through collapser;
Step 3, traction:
Film bar feeding haulage gear step 2 obtained carries out traction and is drawn into film, and ratio of drawing is 5 ~ 10,
Step 4, three coolings step by step:
1) first time cooling:
Film after traction being continued through 4 diameters is that the cooling roller of 70 ~ 110mm carries out first time cooling, leads to tap water in cooling roller;
2) second time cooling:
First time cooled film is carried out second time cooling by air cooling cabinet, and the temperature of cooling air is 15 ~ 20 DEG C;
3) third time cooling
The cooled film of second time being continued through 4 diameters is that the cooling roller of 170 ~ 230 millimeters carries out third time cooling, and leads to water coolant in cooling roller, coolant water temperature is 10 ~ 15 DEG C;
Step 5, rolling:
By third time cooled film by batching after marginal mode correction instrument and static eliminator process, obtain smooth work in-process film volume;
Step 6, print and cut:
Film volume step 5 obtained is delivered to printing press and is unreeled, then after high-frequency spark process, printing, warm air drying, cold air drying, displacement, embossing, insert edge, splitting winding operation, obtains FFS individual layer multilayer packing membrane finished product.
2. a kind of FFS individual layer multilayer packing membrane according to claim 1, is characterized in that: be made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 36 ~ 50%;
Ethylene-vinyl acetate copolymer 10 ~ 20%;
Ultra-low density polyethylene 5 ~ 10%;
LLDPE 25 ~ 40%;
Masterbatch 3 ~ 5%.
3. a kind of FFS individual layer multilayer packing membrane according to claim 2, is characterized in that: be made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 50%;
Ethylene-vinyl acetate copolymer 10%;
Ultra-low density polyethylene 10%;
LLDPE 25%;
Masterbatch 5%.
4. a kind of FFS individual layer multilayer packing membrane according to claim 2, is characterized in that: be made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 40%;
Ethylene-vinyl acetate copolymer 10%;
Ultra-low density polyethylene 10%;
LLDPE 35%;
Masterbatch 5%.
5. a kind of FFS individual layer multilayer packing membrane according to claim 2, is characterized in that: be made up of the raw material of following weight percent:
Metallocene linear low density polyethylene 36%;
Ethylene-vinyl acetate copolymer 15%;
Ultra-low density polyethylene 5%;
LLDPE 40%;
Masterbatch 4%.
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Address after: 525000 Guangdong Zhonghe Plastics Co., Ltd. 28 Guanghua North Road, Guangdong, Maoming Patentee after: Guangdong Zhonghe Plastic Co., Ltd. Address before: 525000 Guangdong Zhonghe Plastics Co., Ltd. 28 Guanghua North Road, Guangdong, Maoming Patentee before: Guangdong Sunion Chemical & Plastic Co., Ltd. |