CN203185778U - Arbitrary direction hand-torn composite packaging film structure - Google Patents

Abstract

The utility model discloses an arbitrary direction hand-torn composite packaging film structure which is has a polyethylene terephthalate (PET)/ polyethylene (PE). ethylene-acrylic acid (EAA)/ aluminum (AL)/ PE/ PE composite structure formed by compounding three layers of base materials with different performances, wherein the outer layer is made from PET, the first protective layer is made from PE. EAA, the blocking layer is made from AL foil, the second protective layer is made from PE, and the inner layer is made from PE. The utility model also discloses a preparation method of an arbitrary direction hand-torn composite packaging film. The arbitrary direction hand-torn composite packaging film structure has the advantages that the structure has good goods shelf effect and improves the product grade; the structure has good barrier property, thus guaranteeing the quality guarantee period of packaged content; and the structure is high in package sealing property and free from a nick, thus maintaining the integrity of the package in the transporting and moving processes, and being good in protection effect.

Description

But tear the composite packaging membrane structure to hand arbitrarily

Technical field

The utility model relates to a kind of packaging film, but specifically is that a kind of hand tears the composite packaging membrane structure.

Background technology

In recent years, along with expanding economy, the raising of people's living standard, China leisure food market is also developing by leaps and bounds, various leisure food such as dilated food, biscuit, dry fruit, cereal foods, coffee, meat products series etc. are subjected to liking of many families deeply, and they no longer are children's patents, and being grown up especially, the young woman has become main flow consumer groups.Nowadays, leisure food has become the daily necessities of more and more families.China is populous, and along with growth in the living standard, the food consumption field will become a big gold mine that is about to blowout.China's leisure food industry must become following 10 years gold industries the most potential.Also will there be a market that has a high potential in the leisure food flexible package industry that matches with it.

Current, what 90% leisure food adopted all is the flexible package form.This kind packs that not only cost is cheap, and packaging protecting is made good use of, and outward appearance is beautiful, and shelf are effective, catch consumer's attraction easily.Though but the combined package bag that uses in the market can play the better protect effect to content, it is not too convenient to open.For head it off, production firm normally adds means such as tearing port, sawtooth pattern edge sealing or laser tangent line and forms a unlatching start-up portion, reaches the effect of easily tearing.Add tearing port, often effect is very undesirable for this mode of sawtooth pattern edge sealing, and has limited the design of the literal in the packaging bag, pattern etc., influences the outward appearance of sack.Sometimes the consumer also need open by instruments such as scissors; And the laser tangent line tends to have influence on the barrier property of packaging material.In addition, add tearing port, sawtooth pattern edge sealing, laser tangent line etc. also needs to add corresponding equipment, increases operation, brings difficulty to control of product quality, increases production cost.

Traditional easily tear the structure that printing compound film adopts PT20 μ/AL paper tinsel 7 μ/PE30 μ more, the perhaps single copper paper of 50g/PE30 μ, because the PT(glassine paper) and 50g list copper Hard copy body have easy-to-rupture and impressionability, make whole composite membrane have the characteristic that printed patterns and Ke Yi tear, but adopt glassine paper and single copper paper higher as the traditional structure cost that easily tears the printing compound film fabric, particularly the manufacturing of glassine paper relates to environmental issue and bigger technical difficulty, present Chinese flexible package industry is to the equal dependence on import of high-quality glassine paper, so cost is very high always for many years.

The utility model content

But the technical problems to be solved in the utility model provide need not after a kind of moulding to add easy tearing port, protection effect good, economic and practical tear the composite packaging membrane structure to hand arbitrarily.

Tear a difficult problem in order to solve hand of the prior art, the applicant has organized the tackling key problem of this project, rely on the knowhow of color printing composite soft packaging for many years, make great efforts to explore, collect by a large amount of tests and data, but develop packaging material of the present utility model voluntarily---tear composite package film to hand arbitrarily.

The utility model solves the problems of the technologies described above by the following technical solutions: but a kind ofly tear composite package film to hand arbitrarily, it is characterized in that: be the PET/PEEAA/AL/PE/PE composite construction that the base material by three layers of different performance is composited, wherein: skin: PET; First protective layer: PEEAA; Barrier layer: AL paper tinsel; Second protective layer: PE; Internal layer: PE.

Optimize, the thickness of described outer field PET is 11～13 μ m, and the thickness of barrier layer AL layer is 8～10 μ m, and the thickness of internal layer PE layer is 33～37 μ m.

Optimize; first protective layer is extruded PE, EAA for the bimodulus head, and second protective layer is for extruding PE, and wherein the thickness of extruding PE in first protective layer is 6～8 μ m; the thickness of extruding EAA in first protective layer is 7～9 μ m, and the thickness of extruding PE in second protective layer is 14～16 μ m.

Optimize, first protective layer extrude PE in outer PET side, extrude EAA in AL paper tinsel one side, PE and EAA combination.

Optimize, be distributed with on the film substrate of described outer PET and penetrate minute aperture and through hole not.

Optimize, exist 100-150 to penetrate minute aperture on every square centimeter on the film substrate surface.

Optimize, described internal layer PE is made up of corona layer, intermediate layer, hot sealing layer, wherein the corona layer is made up of low density polyethylene (LDPE) and linear low density of polyethylene, wherein the weight ratio of low density polyethylene (LDPE) and linear low density of polyethylene is 1:1 ~ 1:2, the intermediate layer is made up of low density polyethylene (LDPE) and linear low density of polyethylene, wherein the weight ratio of low density polyethylene (LDPE) and linear low density of polyethylene is 1:1 ~ 1:2, hot sealing layer comprises low density polyethylene (LDPE), metallocene PE and ionic polyolefin, weight proportion 1:1:1 ~ 1:2:1 that each is formed.

Advantage of the present utility model is: (1) clear patterns, beautiful, the unique composite construction of outward appearance, and make it adapt to the good packing demand of product deflection, good shelf effect is arranged, can improve product specification; (2) Du Te composite construction, the selection of certain material makes its packing demand that adapts to the product high-barrier, good barrier property, the shelf-life that can guarantee the packing content thing.(3) outer PET handles, and human oriented design can be torn at the arbitrfary point hand and be opened, and has greatly improved consumer's degree easy to use.(4) package encapsulation is strong, non-notch, and the integrality that can keep packing in the process is moved in transportation, and the protection effect is good.

Description of drawings

But Fig. 1 is the utility model tears packaging film structure arbitrarily to hand composite junction composition.

But Fig. 2 is the utility model tears packaging film structure arbitrarily to hand technological process of production figure.

But Fig. 3 is the utility model tears the PET film of packaging film structure arbitrarily to hand structural representation.

The specific embodiment

But should be arbitrarily tearing the composite packaging membrane structure to hand is the PET/PEEAA/AL/PE/PE composite construction that the base material by three layers of different performance is composited.

See also shown in Figure 1, wherein:

Outer: the PET(ethylene glycol terephthalate);

First protective layer: the EAA(ethylene acrylic acid co polymer PE(polyethylene));

Barrier layer: the AL(aluminium foil);

Second protective layer: the PE(polyethylene);

Internal layer: the PE(polyethylene).

Please consult Fig. 2 simultaneously, but that this tears the preparation method of composite packaging membrane structure to hand arbitrarily is as follows:

Step 1: raw material PET film is by normal technological process printing, after finishing printing process, change over to and easily tear treatment process, see also shown in Figure 3, make to be distributed with on the PET film substrate 1 and penetrate minute aperture 2 and through hole 3 not, obtain PET and easily tear print film, this treated PET easily tears on every square centimeter on PET film substrate 1 surface of print film and exists 100-150 to penetrate minute aperture 2, by the physical treatment to the little breach of PET film surface, but successfully solved tearing property of PET film purpose hand in office, penetrate the density of minute aperture 2 by adjustment, size, the hand of control composite membrane tears performance;

Step 2: internal layer PE film processed, adopt existing technology to get final product, the PE plastic pellet adds the extruder hopper becomes the PE melt by heater and extruder effect, be extruded as tube through annular die head, tube is after leaving die orifice, charge into a certain amount of compressed air from the die head centre bore, it is propelled the price of into the blister film, simultaneously again through vane cooling air cooling typing, rise to certain distance through the draw-gear traction, by collapser breath bubble folder partially, the back is pressed from both sides by carry-over pinch rolls holds together to form duplicature, through the outer surface of corona unit corona film, the back is batched by wrap-up side cut burst and is PE film volume.

Each layer PE resin, additive according to specific adding proportion, are placed in the barrel separately the technological parameter of extruder equipment respectively:

Speed of production 20m/min, extrusion machine fused mass pressure＜45Mpa.

Produce no crystal block, striped, die orifice line, the uniform PE film of thickness;

Step 3: extrude compound for the first time, the position that places extruder one to put outer PET film, satisfactory barrier layer AL paper tinsel is placed two positions of putting, the PE that inserts first protective layer in a die head extrudes pellet, and the EAA that inserts first protective layer in another die head extrudes pellet, and PE and EAA extrude simultaneously and be compounded in PET and easily tear between print film and the barrier layer AL paper tinsel, outer PET side is squeezed into PE, EAA squeezes and AL paper tinsel one side, PE and EAA combination, the composite construction of formation PET/PEEAA/AL paper tinsel;

Step 4: extrude compound for the second time, the composite construction of PET/PEEAA/AL paper tinsel was put into curing chamber 12～24 hours, glue solidifies substantially, again the PE of second protective layer is extruded and be compounded between PET/PEEAA/AL paper tinsel composite construction and the internal layer PE, the composite construction that squeezes multiple semi-finished product PET/PEEAA/AL paper tinsel the first time after overcuring has stability preferably, extrudes compound tense with internal layer PE film and can not produce problems such as wrinkle;

Step 5: cut: according to the required different in width of consumer packaging, length, specification, compound good packaging film is cut the rolling film, to adapt to the requirement of user's automatic packaging machinery, the length and width specification of cutting the volume film should be in strict conformity with customer requirement, end face flatness≤2mm, layout position does not have skew, and the calm space of a whole page of joint coincide.

Wherein outer field PET film has the perfume of guarantor, resistance oxygen, and is the polarity interface, is fit to two-sided Compound Machining requirement.The thickness of outer field PET is that 11～13 μ m(are 12 basically), preferred, the thickness of outer field PET is 13 μ m.And its key technical indexes is participated in following table.

PET film the key technical indexes:

The thickness of barrier layer AL paper tinsel layer is 8～10 μ m, and preferred, the thickness of AL paper tinsel layer is 9 μ m, and the key technical indexes of this AL paper tinsel layer is participated in following table.

The key technical indexes of AL paper tinsel layer:

Project	Index
		The joint number, individual	≤1
The pure aluminum foil pinhole number, individual/m 2	0

The thickness of internal layer PE layer is 33～37 μ m, and preferred, the thickness of PE layer is 35 μ m, and the key technical indexes of this AL paper tinsel layer is participated in following table 2.

The key technical indexes:

First protective layer is extruded PE, EAA for the bimodulus head; second protective layer is for extruding PE; wherein the thickness of extruding PE in first protective layer is 6～8 μ m, and preferred, the thickness of extruding PE in first protective layer is 7 μ m; the thickness of extruding EAA in first protective layer is 7～9 μ m; preferably, the thickness of extruding EAA in first protective layer is 8 μ m, and the thickness of extruding PE in second protective layer is 14～16 μ m; preferably, the thickness of extruding PE in second protective layer is 15 μ m.The technical indicator of the above-mentioned PE of extruding sees the following form, and the technical indicator of extruding EAA sees the following form.

Extrude/technical indicator of PE

Extrude the technical indicator of EAA

Wherein the treatment process of easily tearing in the step 1 is: the relief printing plate roller of making a Gent system, coarse processing is carried out on the surface, PET film after the printing is gone up printing machine again, utilize metal pressure roller (screen resilience that can avoid rubber roller to produce) and the acting in conjunction of coarse relief printing plate to make the PET fine fisssureization at printing element, thereby make PET produce the invisible micro-crack of naked eyes and reach the purpose that easily tear the optional position, the key technology of this project is: how to make the PET film after the processing both keep good transparency, suitable mechanical strength, reach simultaneously and easily tear effect.Through to the repetition test of the coarse Fabrication parameter of relief printing plate, finally determined the Fabrication parameter that relief printing plate is coarse, guarantee the rational micro-crack shape of PET, reach that naked eyes be cannot see and easily tear easy purpose; In addition, the optimum pressure value of metal pressure roller, best number of processes and processing speed have also been determined in test repeatedly, find all optimal processing parameters that easily tear treatment process, the optimum pressure value 2500N-3500N of metal pressure roller; Best number of processes: 2-4; Processing speed: 150-200m/mim is for mass production is laid a good foundation.The PET that obtains after treatment easily tears the characteristics of print film: the sack outward appearance that this composite membrane is made is as broad as long with the PET printing compound film that is untreated, but the optional position can be torn by hand, and easily tears printing compound film with traditional PT or single copper paper material and compares cost decline 20%-35%;

Described step 2 and step 3 extrude compound in, that optimizes carries out type selecting to glue, on the glue type selecting, we select levelability glue preferably for use, can guarantee that so good peel strength and intensity are more even, adjust simultaneously and squeeze multiple glue and resin formula, by experiment repeatedly, we select following glue and prescription for use:

Extrude for the first time compound glue and resin: UK 4501: second fat=10:25, EAA5050+1C7A;

Extrude for the second time compound glue and resin: UK 4501: second fat=10:25,1C7A.

To squeeze multiple roughness of film and improve in order to make, extrude for the second time and adopt the pitted skin roller to squeeze again compound the time.Can improve peel strength like this, the film forming of pitted skin roller can produce uneven macromolecule typing simultaneously, produces discontinuous mechanical property film, reaches and tears pulse, improves hand and tears performance.

Internal layer PE in the described step 4 need satisfy the multinomial requirement of packaging material as the heat-sealing PE layer of innermost layer, and the prescription of internal layer PE also is one of the emphasis of the research and development of this project.

Internal layer PE prescription thinking and principle:

1, because packaging be the various content of situation, pack especially for powder, the absorption of static, all some is polluted by content to make finalization area.Therefore, must have good antifouling property and hot sticky performance in the internal layer heat-sealing film, thus the innermost layer of film should select for use resistance tocrocking and thermal viscosity all good polyvinyl plastic body be main, SP0510 for example.

2, finished films need have the better physical mechanical performance, promotes withstand voltage properties, the anti-impact Zhou Xingneng of packing.As raise son 7042 the LLDPE(linear low density of polyethylene that adds high mechanical strength in the prescription).Further improve the requirement of processability, add the LDPE(low density polyethylene (LDPE)), as TN00.

3, coefficient of friction control that must be stable guarantees the normal operation of high-speed packaging.The multichannel automatic packaging machine is had relatively high expectations to coefficient of friction, if the coefficient of friction of film itself is bigger, easily sticks together when then unreeling, so will control lower coefficient of friction (less than 0.15).Because EAA polarity is big, easily adsorb slipping agent, make it that transport phenomena take place, so we heighten the amount of slipping agent to 2500PPM from common 1500PPM commonly used, with advancing to cooperate some opening agent, cooperate slipping agent to separate out.

But 4, must have the technical characterstic that any direction hand tears, be user-friendly to.Therefore, in internal layer PE prescription, be blended into the good ionic polymerization resin of tear resistance, both can have improved antipollution heat sealability and the heat seal strength of film, the hand that improves composite membrane again tears performance.As 1652SR.

4 points to sum up, internal layer PE is by the corona layer, the intermediate layer, hot sealing layer is formed, wherein the corona layer is made up of low density polyethylene (LDPE) and linear low density of polyethylene, wherein the weight ratio of low density polyethylene (LDPE) and linear low density of polyethylene is 1:1 ~ 1:2, the intermediate layer is made up of low density polyethylene (LDPE) and linear low density of polyethylene, wherein the weight ratio of low density polyethylene (LDPE) and linear low density of polyethylene is 1:1 ~ 1:2, hot sealing layer comprises low density polyethylene (LDPE), metallocene PE and ionic polyolefin, weight proportion 1:1:1 ~ 1:2:1 that each is formed, hot sealing layer is also allocated slipping agent and opening agent into.

Formula examples:

Corona layer: 50KgTN00+50Kg raises son 7042

Intermediate layer: 25KgTN00+50Kg raises son 7042

Hot sealing layer: 25Kg Exxon 100AC+25KgSP0510+25Kg1652SR+1.4Kg100990-K (slipping agent)+1.5KgAB-20LD(opening agent)

The key technical indexes such as the following table of this internal layer PE:

To sum up, the outer PET film that adopts has guaranteed dimensional stability, the printing decoration result of this project package material in High-Speed Automatic packaging process, has promoted The comprehensive performance and product specification.Its characteristic also can guarantee preferably when high temperature scalds the bar heat seal, the adhesive force of printing ink and heat-resisting back discoloration.And this layer has been carried out specially treated, made the PET film possess the easy-to-rupture energy.

It is because it has high barrier property and shading performance that barrier layer adopts AL paper tinsel (aluminium foil), can play good resistance wet resistance oxygen and shaded effect, has good fragrance protectiveness, can well protect content.Simultaneously the AL paper tinsel has good deflection, can reality shelf effect preferably.

Adopt the first protective layer PEEAA and the second protective layer PE in the both sides of barrier layer AL paper tinsel: ethylene acrylic acid co polymer (EAA) is a kind of polymer with thermoplasticity and high thermal bonding; because the existence of carboxyl group and the effect of hydrogen bond; the crystallinity of polymer is suppressed; the main chain formability is destroyed, has therefore guaranteed that the toughness of EAA is good.EAA and AL paper tinsel have is combined fastness, fracture and the pin hole phenomenon that can well protect barrier layer AL paper tinsel to take place preferably.The characteristics of EAA are: accurate MOLECULE DESIGN and high-precision co-monomer content accurately can provide excellent adhesion at the AL paper tinsel, thereby optimize the complete of material-structure and barrier greatly; Can form the chemical functional key with the AL paper tinsel, the interlayer combined strength bination can not failed, and guarantee that the AL paper tinsel can not rupture; Can under lower temperature, extrude, thereby the cost of having avoided the processing temperature height to bring increases; Have lower initial heat-sealing temperature, guarantee the high-speed packaging performance; Excellent hot sticky performance, by packing material the time, good heat sealer and heat seal strength have guaranteed to have well firm sealing.Because the EAA price is higher; mix PE so adopt in a side of AL paper tinsel, opposite side is squeezed into PE, fracture and the pin hole phenomenon that not only can well protect barrier layer AL paper tinsel to take place; provide excellent adhesion at aluminium foil, and can reduce the production cost of composite membrane greatly.

Internal layer PE has good antifouling property and hot sticky performance, even when closure part is stained with the content residue, still can keep excellent sealing effect; Simultaneously, the innovation by prescription makes this layer PE film have the performance that better any direction easily tears.Having has better physical mechanical performance and stable coefficient of friction control, guarantees the normal operation of high-speed packaging.

But following table is this tears like product main performance technical indicator comparable situation that packaging film and A company and B company produce to hand arbitrarily, and from the result, but this tears packaging film to hand arbitrarily and has met or exceeded the similar products at home and abroad index.

But and this arbitrarily to hand tear the packaging film cost lower, easy to use, adapt to modernization automated packaging equipment fast, package speed is fast, the efficient height.This product can be torn from any direction, is fit to go on business, uses when travelling, and has improved consumer's degree easy to use greatly.Meet the trend of packing development from now on, have market prospects widely.

But this tears packaging film to hand arbitrarily and feeds back after a plurality of client's use tests, every index of this product meets the packaging standard of appointing easy direction easily to tear fully, can be widely used in multi-field packings such as each leisure food, coffee powder bag, family planning articles for use, nursing materials.This product is easy to use, and cost is lower, and opening is smooth attractive in appearance, is applicable to that current saving cost reduces the development trend that consumes.

But this arbitrarily to hand tear packaging film in process of production " three wastes " discharging can reach environmental requirement, can produce not pollute environment.In process of production, there is not chemical reaction.Process equipment all adopts noise devices, and exhaust facility is perfect, and circulation of air is smooth and easy.Used material is all nontoxic, and the operative employee is not had harm, environmentally safe.

The preferred embodiment that the above is only created for the utility model; do not create in order to limit the utility model; all any modifications of within spirit that the utility model is created and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain that the utility model creates.

Claims (6)

1. but one kind is torn the composite packaging membrane structure to hand arbitrarily, it is characterized in that: be the PET/PEEAA/AL/PE/PE composite construction that the base material by three layers of different performance is composited, wherein: skin: PET; First protective layer: PEEAA; Barrier layer: AL paper tinsel; Second protective layer: PE; Internal layer: PE.

2. but as claimed in claim 1ly tear the composite packaging membrane structure to hand arbitrarily, it is characterized in that: the thickness of described outer field PET is 11～13 μ m, and the thickness of barrier layer AL layer is 8～10 μ m, and the thickness of internal layer PE layer is 33～37 μ m.

3. but as claimed in claim 2ly tear the composite packaging membrane structure to hand arbitrarily; it is characterized in that: first protective layer is extruded PE, EAA for the bimodulus head; second protective layer is for extruding PE; wherein the thickness of extruding PE in first protective layer is 6～8 μ m; the thickness of extruding EAA in first protective layer is 7～9 μ m, and the thickness of extruding PE in second protective layer is 14～16 μ m.

4. but as claimed in claim 3ly tear the composite packaging membrane structure to hand arbitrarily, it is characterized in that: first protective layer extrude PE in outer PET side, extrude EAA in AL paper tinsel one side, PE and EAA combination.

5. but as claimed in claim 1ly tear the composite packaging membrane structure to hand arbitrarily, it is characterized in that: be distributed with on the film substrate of described outer PET and penetrate minute aperture and through hole not.

6. but as claimed in claim 5ly tear the composite packaging membrane structure to hand arbitrarily, it is characterized in that: exist 100-150 to penetrate minute aperture on every square centimeter on the film substrate surface.

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