CN202862736U - Seal covering membrane - Google Patents

Abstract

The utility model discloses seal covering membrane. The covering membrane comprises a PET (polyethylene glycol terephthalate) layer, an aluminum layer, an ethylene acrylic acid copolymer layer, a bimodal polyethylene layer and a composite polyethylene layer. Compared with the prior art, the seal covering membrane has the characteristics of 1) being good in fragrance protectiveness, moisture resistance and gas barrier property; 2) being adaptive to high-speed packaging; 3) being convenient to process and quick to change the line of production, and adaptive to productions of bulk orders and small orders; 4) being low in price and high in cost performance; and 5) having a special inner layer structure design and a function of repeatedly opening and sealing, and being capable of well protecting remaining contents. A product can be widely applied to package of biscuits, jams, potato chips (strips), convenient foods, puffed foods and leisure foods, adapts to the modern nervous fast life rhythm, and can reduce the use of secondary package. During the actual packaging process, the finished product rate of the package can be effectively guaranteed, the membrane waste can be reduced, the production efficiency can be effectively improved and the cost can be reduced.

Description

A kind of sealing epiphragma

Technical field

The utility model belongs to packaging film, belongs to especially the sealing epiphragma.

Background technology

In recent years, along with expanding economy, the disposable income in people's hand also increases year by year, and material life is enriched constantly, has also obtained fast development with people's closely bound up food service industry of living.During " 12 ", the main target that proposes China's development of food industry is exactly the convenient purification problem that will solve food, gives priority to all kinds of instant food, such as major-minor instant food, Chinese and Western in conjunction with supporting fast food, student's meal, quick-frozen food, quick-served semi-finished etc.Food industry whenever strides forward a step, all packaging for foodstuff is proposed Secretary.

Now, the quickening of people's rhythm of life has determined that convenient purification will be the irreversible trend of food development.The food production merchant tries hard to attract the consumer with hygienic and convenient, novel packing free from vulgarity, elegant in appearance.Following development trend will appear in " Chinese Flexible Package Market newspaper " forecast China packaging market: 1, is convenient to open, topple over and take out, and easy to use; 2, compact, seriation; 3, micro-wave oven purpose-made pallet packing; Wherein particularly the go out leisure and the travel food that eat, not needing other container, not needing the instant packed of extra opener is the emphasis of development.

As far back as eighties of last century beginning of the nineties, along with the fast development of western fast food and instant food, take plastic containers as backing on the packaged form of envelope Soft Roll capping material be widely used in developed countries such as America and Europes.This type of packing does not need extra container, conveniently opens, is easy to carry about with one, safety and sanitation, and very the busy crowd of proper operation uses, and just has been subject to people's extensive welcome after the release.

In recent years, packaged form for the plastic containers seal cap of quick rhythm of life release also appears on China packaging for foodstuff market successively, such as packings such as jelly, jam, biscuit, potato chips, because the type packing is small and exquisite, shelf are effective, the safety and sanitation performance is high, and is easy-to-use, obtained increasing concern.But there is an obvious problem in this type of packing at present, and after opening exactly, the food in the packing must disposable eating up, otherwise, because involution again after the packing unlatching can't play to the food that has not eaten corresponding protective effect.At present, on the market to repeating to seal solution of problem, often by realizing at bag installing slide fastener.But having two problems, 1) procurement price of slide fastener own is higher, strengthened packing cost; 2) add slide fastener in the packaging process, reduced production efficiency.3) the zipper strip packing is not suitable for the packing of the friable food products such as potato chips, biscuit, expanded class.

The utility model content

Technical problem to be solved in the utility model provides a kind of sealing epiphragma that repeats press seal.

The technical scheme of the utility model technical solution problem is a kind of sealing epiphragma, is pet layer, aluminium lamination, ethylene acrylic acid co polymer layer, bimodal polyethylene layer, composite polyethylene layer from outside to inside.

Preferred sealing epiphragma is 12 μ mPET layers, 7 μ m aluminium laminations, 12 μ m ethylene acrylic acid co polymer layers, 6 μ m bimodal polyethylene layers, 50 μ m composite polyethylene layers.

Described composite polyethylene layer is skin, glue-line, ethylene acrylic acid co polymer layer from outside to inside.

Preferred composite polyethylene layer is 20 μ m skin, 20 μ m glue-lines, 10 μ m ethene-acetate ethylene copolymer layers.

Described glue-line is boss's glue-line.

In the utility model:

Employing PET(biaxial tension PETG) film has guaranteed dimensional stability, printing decoration result, the combination property that promoted product and the product specification of packaging material in High-Speed Automatic packaging process as skin.Its characteristic also can guarantee preferably when high temperature scalds the bar heat seal, the adhesive force of printing ink and heat-resisting rear discoloration.

Aluminium foil is because it has high barrier property and shading performance, can play good resistance wet resistance oxygen and shaded effect, has good fragrance protectiveness, can well protect content.

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, and the main chain formability is destroyed, has therefore guaranteed that the toughness of EAA is good.Fracture and the pin-hole phenomena that can well protect barrier layer AL paper tinsel to occur.

Its characteristics are: accurate MOLECULE DESIGN and high-precision accurately co-monomer content can provide excellent adhesion at aluminium foil, thereby greatly optimize the complete of material-structure and barrier.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 avoid the high cost that brings of processing temperature to increase.

Bimodal polyethylene has good flowability and better physical and mechanical properties.Because EAA divided thin film sub-feature, its molding effect is poor.Therefore, squeeze into again one deck PE(bimodal polyethylene), synergy, the molding effect of assurance film has improved processing characteristics.Can reduce the problem that tightens that EAA coextrusion compound tense is prone to, the thickness uniformity that assurance is extruded, thus guarantee the apparatus adaptability of finished product on packing machine.Simultaneously it also has good hot sticky performance and heat sealability, with internal layer PE film co-extrusion after bonding strength strengthen;

Even compound PE film formulation when closure part is stained with the content residue, still can keep excellent sealing effect so that it has good antifouling property and hot sticky performance; After bonding with PS or PP cup, preferably heat sealability is arranged; Have stable coefficient of friction control, guarantee the normal operation of high-speed packaging.After epiphragma opened from PP or PS cup, the intermediate layer boss's glue in the PE layer can play good again involution effect.

Skin is selected LDPE and LLDPE, can reduce production costs on the one hand, keeps the deflection earnestly time of PE film, on the other hand, itself and PE(bimodal polyethylene) between good adhesion is arranged.

With boss's glue as the intermediate layer.Boss's glue has preferably flowability and internal adhesion, by repeatedly opening test data, selects MX615 type boss glue.This glue reaches the above bonding force of 6.0N/15mm when opening for the first time, at press seal repeatedly, open after ten times, the bonding force about 2N/15MM of still having an appointment has fabulous repeated press seal function.

Because when heat-sealing bonding PP cup or PS cup material, so compound PE must have good antifouling property and hot sticky performance, the characteristics such as EVA has has bonding force good, and good, the percentage elongation of the transparency and obdurability are good are made by ethene, two kinds of monomer copolymerizations of vinyl acetate.Be the PE film of 50 μ m at total thickness, with EVA as with PP(PS) when the hot sealing layer thickness that directly contacts of cup is decided to be 10 μ m, can play good sealing effect.

The utility model compared with prior art has following characteristics

1) fragrance protectiveness, resistance is moist, barrier properties for gases good;

2) adapt to high-speed packaging;

3) easy to process, change the line of production rapidly, can adapt to the production of big or small order;

4) low price, the cost performance that tool is higher;

5) unique endothecium structure design, and have and repeat to open and the function of involution, remaining content can be protected preferably.This product can be widely used in the packing of biscuit, jam, potato chips (bar), instant food, dilated food, leisure food etc., adapts to fast rhythm of life of modern anxiety, can reduce the use of secondary package.In the virtual package process, can effectively guarantee the packed products rate, the coating materials waste is few, and energy Effective Raise production efficiency reduces cost.

Description of drawings

Fig. 1 is structural representation of the present utility model.

Fig. 2 is the result schematic diagram of composite polyethylene layer of the present utility model.

Fig. 3 is process chart of the present utility model.

In Fig. 1,2,1 is that pet layer, 2 is that aluminium lamination, 3 is that ethylene acrylic acid co polymer layer, 4 is that bimodal polyethylene layer, 5 is that composite polyethylene layer, 51 is that skin, 52 is that glue-line, 53 is the ethylene acrylic acid co polymer layer.

The specific embodiment

Below in conjunction with embodiment the utility model is described in detail.

Embodiment 1:

By shown in Figure 3:

Preparation technology of the present utility model is

A, PET printing process: print at PET, make the PET print film;

B, the first compound working procedure: PET print film and aluminium foil are carried out compound, make the PET/AL composite membrane;

C, the second compound working procedure: PET/AL composite membrane and ethylene acrylic acid co polymer, bimodal polyethylene, composite polyethylene are carried out coextru-lamination,

Described composite polyethylene is skin, boss's glue, ethylene acrylic acid co polymer coextru-lamination;

Skin wherein is comprised of low density polyethylene (LDPE) and LLDPE, and the weight ratio of low density polyethylene (LDPE) and LLDPE is 1:3;

As shown in Figure 1, 2, the made composite membrane of the present invention is 12 μ mPET layers, 1,7 μ m aluminium lamination, 2,12 μ m ethylene acrylic acid co polymer layers, 3,6 μ m bimodal polyethylene layer, 4,50 μ m composite polyethylene layer 5 from outside to inside;

Described composite polyethylene layer is 20 μ m skins, 51,20 μ m glue-lines, 52,10 μ m ethene-acetate ethylene copolymer layers 53.

Embodiment 2:

Be comprised of low density polyethylene (LDPE) and LLDPE except outer, the weight ratio of low density polyethylene (LDPE) and LLDPE is 1:1; Outward, all the other are identical with embodiment 1.

Embodiment 1,2 technique effect are as follows:

Described crowded multiple layer is comprised of ethylene acrylic acid co polymer layer, bimodal polyethylene layer.

Claims (5)

1. a sealing epiphragma is characterized in that: be from outside to inside pet layer, aluminium lamination, ethylene acrylic acid co polymer layer, bimodal polyethylene layer, composite polyethylene layer.

2. a kind of sealing epiphragma according to claim 1, it is characterized in that: described sealing epiphragma is 12 μ mPET layers, 7 μ m aluminium laminations, 12 μ m ethylene acrylic acid co polymer layers, 6 μ m bimodal polyethylene layers, 50 μ m composite polyethylene layers.

3. a kind of sealing epiphragma according to claim 1 is characterized in that: described composite polyethylene layer is skin, glue-line, ethylene acrylic acid co polymer layer from outside to inside.

4. a kind of sealing epiphragma according to claim 3, it is characterized in that: described composite polyethylene layer is 20 μ m skin, 20 μ m glue-lines, 10 μ m ethene-acetate ethylene copolymer layers.

5. a kind of sealing epiphragma according to claim 3, it is characterized in that: described glue-line is boss's glue-line.

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