阅读说明：本技术 一种耐水煮铝塑复合盖膜及其生产工艺 (A kind of plastic-aluminum combined epiphragma of water boiling resistance and its production technology ) 是由 张和平 胡凯 汪学文 董文辉 刘学军 潘安定 陈旭 张红斌 于 2019-08-09 设计创作，主要内容包括：本发明涉及一种耐水煮铝塑复合盖膜及其生产工艺。该铝塑复合盖膜,包括铝箔层,铝箔层一侧干式复合有PE膜层,铝箔层另一侧复合有印刷膜层；PE膜层包括电晕层、中间层以及热封层；电晕层包括48％～52％中密度聚乙烯、23％～27％低密度聚乙烯以及23％～27％高密度聚乙烯；中间层包括48％～52％中密度聚乙烯以及48％～52％高密度聚乙烯；热封层包括48％～52％茂金属聚乙烯、23％～27％低密度聚乙烯以及23％～27％中密度聚乙烯；印刷膜层包括底涂层、油墨层以及保护光油层。该铝塑复合盖膜具有很高的剥离强度、热封强度,且与HDPE瓶封口后,可以在90℃水煮15分钟不变形、不分层、印刷图文不脱落。(The present invention relates to a kind of plastic-aluminum combined epiphragma of water boiling resistance and its production technologies.The plastic-aluminum combined epiphragma, including aluminium foil layer, aluminium foil layer side dry type are compounded with PE film layer, and the aluminium foil layer other side is compounded with printing film layer；PE film layer includes corona layer, middle layer and hot sealing layer；Corona layer includes 48%~52% medium density polyethylene, 23%~27% low density polyethylene (LDPE) and 23%~27% high density polyethylene (HDPE)；Middle layer includes 48%~52% medium density polyethylene and 48%~52% high density polyethylene (HDPE)；Hot sealing layer includes 48%~52% metallocene PE, 23%~27% low density polyethylene (LDPE) and 23%~27% medium density polyethylene；Printing film layer includes priming coat, ink layer and protection light oil reservoir.The plastic-aluminum combined epiphragma has very high peel strength, heat seal strength, and with after HDPE bottle closure, can not fall off in 90 DEG C of boiling 15 minutes indeformable, not stratified, printing image-texts.)

1. a kind of plastic-aluminum combined epiphragma of water boiling resistance, it is characterised in that: including aluminium foil layer, aluminium foil layer side dry type is compounded with PE Film layer, the aluminium foil layer other side are compounded with printing film layer；

The PE film layer includes corona layer, middle layer and hot sealing layer；The corona layer includes formulation by weight: in 48%~52% Density polyethylene, 23%~27% low density polyethylene (LDPE) and 23%~27% high density polyethylene (HDPE)；The middle layer includes weight Amount formula: 48%~52% medium density polyethylene and 48%~52% high density polyethylene (HDPE)；The hot sealing layer includes that weight is matched Side: 48%~52% metallocene PE, 23%~27% low density polyethylene (LDPE) and 23%~27% medium density polyethylene；

The printing film layer includes priming coat, ink layer and protection light oil reservoir, and the priming coat is by being coated on aluminium foil layer Silane coupling agent is formed, and the ink layer is formed by the ink being printed on priming coat, and the protection light oil reservoir is by being printed on ink layer On gloss oil formed.

2. the plastic-aluminum combined epiphragma of water boiling resistance as described in claim 1, it is characterised in that: 50 ± 2 μm of the aluminium foil layer thickness, institute 70 ± 5 μm of PE thicknesses of layers are stated, the corona layer, middle layer and hot sealing layer thickness ratio 2:3:2.

3. the plastic-aluminum combined epiphragma of water boiling resistance as described in claim 1, it is characterised in that: the low density polyethylene (LDPE) trade mark 2420H, the medium density polyethylene trade mark 2038.68G, the high density polyethylene (HDPE) trade mark HTA108, the poly- second of metallocene Alkene trade mark SP4020；The compound adhesive trade mark UK3640 used of the dry type.

4. the plastic-aluminum combined epiphragma of water boiling resistance as described in claim 1, it is characterised in that: the compound adhesive used of the dry type Spread is 3.8~4.2gsm.

5. a kind of production technology of such as plastic-aluminum combined epiphragma of the described in any item water boiling resistances of Claims 1 to 4, it is characterised in that packet Include following steps:

Step 1, it prepares PE film: requiring according to the above formulation by weight by the raw particles of corona layer, middle layer and hot sealing layer point Inflation film manufacturing machine is not added to correspond in barrel, by heating melting extrusion, blown film, cooling and shaping, collapser breath bubble folder partially, corona, Trimming winding process obtains the PE film；

Step 2, dry type is compound: the PE film is compound by adhesive progress dry type with aluminium foil, 80~100 meters of recombination velocity/ Min, 65~80 DEG C of drying temperature；

Step 3, be coated with silane coupling agent: being coated with silane coupling agent with aluminium foil surface of the PE film dry type after compound, then 115~ 125 DEG C are dried to form priming coat；

Step 4, the ink formation ink layer for constituting picture and text printing ink layer: is printed in the base coating surface；

Step 5, printing varnish: forming in the ink layer surface printing varnish and protect light oil reservoir, and gloss oil print speed printing speed 120~ 150 meters/min, 75~95 DEG C of drying temperature；

Step 6, post curing is cut.

6. the production technology of the plastic-aluminum combined epiphragma of water boiling resistance as claimed in claim 5, it is characterised in that: the two sides of the PE film Wide cut 4~6mm big compared to the aluminium foil.

Technical field

The invention belongs to film packaging material field, it is specifically related to a kind of plastic-aluminum combined epiphragma of water boiling resistance and its production work Skill.

Background technique

Plastic-aluminum combined epiphragma is using larger in bottled drink, drug, and main material is by three-decker or two layers at present Structure is constituted, wherein three-decker, that is, PET/Al/PE or PET/Al/CPP, double-layer structure, that is, Al/PE or Al/CPP.Some logical It crosses in the Drinking bottle packaging that suction pipe insertion is drawn, PET intensity is high in three-decker, is unfavorable for suction pipe insertion, usually using two layers The epiphragma of structure, and the epiphragma of double-layer structure is layered leakage after easily occurring in boiling sterilizing at present, Biao Yintuwen falls off, epiphragma The bad problems such as deformation.

Summary of the invention

In order to solve the above technical problem, the present invention provides a kind of plastic-aluminum combined epiphragmas of water boiling resistance.The plastic-aluminum combined epiphragma With very high peel strength, heat seal strength, and with after HDPE bottle closure, can 90 DEG C boiling 15 minutes it is indeformable, regardless of Layer, printing image-text are not fallen off.

In order to achieve the object of the present invention, the invention adopts the following technical scheme:

A kind of plastic-aluminum combined epiphragma of water boiling resistance, including aluminium foil layer, aluminium foil layer side dry type is compounded with PE film layer, described The aluminium foil layer other side is compounded with printing film layer；

The PE film layer includes corona layer, middle layer and hot sealing layer；The corona layer includes formulation by weight: 48%~ 52% medium density polyethylene, 23%~27% low density polyethylene (LDPE) and 23%~27% high density polyethylene (HDPE)；The middle layer Including formulation by weight: 48%~52% medium density polyethylene and 48%~52% high density polyethylene (HDPE)；The hot sealing layer includes Formulation by weight: density is poly- in 48%~52% metallocene PE, 23%~27% low density polyethylene (LDPE) and 23%~27% Ethylene；

The printing film layer includes priming coat, ink layer and protection light oil reservoir, and the priming coat is by being coated on aluminium foil layer On silane coupling agent formed, the ink layer is formed by the ink being printed on priming coat, and the protection light oil reservoir is by being printed on oil Gloss oil in layer of ink is formed.

Further technical solution: 50 ± 2 μm of the aluminium foil layer thickness, 70 ± 5 μm of the PE thicknesses of layers, the corona Layer, middle layer and hot sealing layer thickness ratio 2:3:2.

Further technical solution: the low density polyethylene (LDPE) trade mark 2420H, the medium density polyethylene trade mark 2038.68G, the high density polyethylene (HDPE) trade mark HTA108, the metallocene PE trade mark SP4020；The compound institute of dry type With adhesive trade mark UK3640.

Further technical solution: the spread of the compound adhesive used of the dry type is 3.8~4.2gsm.

It is a further object to provide the production technologies of the plastic-aluminum combined epiphragma of water boiling resistance described in one kind, including such as Lower step:

Step 1, it prepares PE film: requiring according to the above formulation by weight by the raw material grain of corona layer, middle layer and hot sealing layer Son is added separately to inflation film manufacturing machine and corresponds in barrel, inclined, electric by heating melting extrusion, blown film, cooling and shaping, collapser breath bubble folder Dizzy, trimming winding process, obtains the PE film；

Step 2, dry type is compound: the PE film and aluminium foil by adhesive are carried out dry type compound, recombination velocity 80~100 Rice/min, 65~80 DEG C of drying temperature；

Step 3, it is coated with silane coupling agent: silane coupling agent is being coated with aluminium foil surface of the PE film dry type after compound, then 115 ~125 DEG C are dried to form priming coat；

Step 4, the ink formation ink layer for constituting picture and text printing ink layer: is printed in the base coating surface；

Step 5, protection light oil reservoir, gloss oil print speed printing speed 120 printing varnish: are formed in the ink layer surface printing varnish ~150 meters/min, 75~95 DEG C of drying temperature；

Step 6, post curing is cut.

Further technical solution: the two sides wide cut of the PE film 4~6mm big compared to the aluminium foil.

The beneficial effects of the present invention are:

(1) raw material melting point resin and density are all higher in the PE film layer selected by the present invention, produce heatproof by inflation film manufacturing machine Property it is high, stiffness is good, has the PE film of certain toughness.PE film formulation design mainly promotes the rigidity of plastic-aluminum combined epiphragma and resistance to Warm nature, wherein the formula of hot sealing layer can not only promote Film stiffness, while make film also and have heat-sealing and Gao Wenre well Sticky energy.

The integral rigidity of the plastic-aluminum combined epiphragma of the present invention is good, after sealing with HDPE bottles, through not sealing when 90 DEG C of water-bath sterilizations Apparent stretcher strain does not occur for the composite membrane for closing region, and it is i.e. not stratified on the one hand to can protect compound fastness, on the other hand There is preferable appearance after product can be made to sterilize.It is (such as sliding containing transportable small molecule without being added in the PE film layer formula Refreshing agent) resin, it is therefore an objective to avoiding small molecule from moving to aluminium foil surface after compound influences ink printing effect.

Silane coupling agent in printing film layer of the present invention has surface treatment effect to aluminium foil, it can dissolution aluminium foil processing When small-molecule substance remained on surface, while silane coupling agent also has good bonding intensity with aluminium foil and ink, by ink layer Surface printing gloss oil forms protection light oil reservoir, it is possible to prevente effectively from the picture and text of ink printing are fallen off in high-temperature heating.

(2) present invention selects 50um aluminium foil, has very high stiffness and texture, and smooth not weak corrugation after slice is convenient for Send piece film positioning envelope bottleneck.70umPE of the present invention is selected, may be implemented to have with high density polyethylene (HDPE) (HDPE) bottle compatible well Heat sealing performance, the preferred 65-75um of PE thicknesses of layers, but if too thick, increased costs, melting sealing time is long, efficiency It is low；If too thin, the pressure that seals can ironed sealing edge, reduce sealing strength, there is sealing to destroy leakage cup wind in market Danger.

(3) theory of PE film layer formula design of the present invention is mainly to promote the rigidity and heat resistance of PE film, but to integrate Consider the factors such as processing performance, melting sealing efficiency, sealing strength and formulation cost.So formula designed by the present invention produces Film integral rigidity it is good, at low cost, it is high to seal efficiency and intensity, with aluminium foil it is compound after seal with HDPE bottles, through 90 DEG C of water Apparent stretcher strain does not occur for the composite membrane for not sealing region when bath sterilizing, and compound fastness has not only been protected not stretch layering, but also There is preferable appearance after product can be made to sterilize.

(4) for the present invention using the compound production sequence republished of first dry type, can substantially reduce aluminium foil corrugation (can not The dead wrinkle restored) scrap problem, after the compound PE film of aluminium foil, since there is certain flexibility in composite film thickness direction, so Even if aluminium foil corrugation is also that can restore smooth in subsequent cutting by adjusting platen pressure.

The compound Liofol UK3640 Bi-component adhesive for selecting Henkel of dry type of the present invention, by using 90 line *, 95 mesh net Line roller gluing, control 3.8~4.2gsm of spread, 80~100 meters/min of recombination velocity, 65~80 DEG C of drying temperature, the gluing Aluminium foil and PE film are bonded effectively after agent solidification, is resistant to 121 DEG C, the boiling of 30min and boiling water boiling, and there is good high temperature resistant shape Become, be layered composite covering film will not.

PE film of the present invention two sides wide cut 4~6mm wide compared with aluminium foil two sides, this is it is possible to prevente effectively from aluminium foil hurts glue seal carving Brush pressure roller, but also it is not easy wide in order to avoid influencing the preparation of printing film layer.

Printing layer uses sandwich structure, i.e., " priming coat-ink layer-protection light oil reservoir ", priming coat is the table for making aluminium foil Surface treatment effect can clear up small-molecule substance remained on surface when aluminium foil processing, while also have well with aluminium foil and ink Bonding intensity selects the VAT primary coat of the dedicated high temperature resistant high adhesion of DIC company, high temperature (120 DEG C) dry coating；Ink is selected The dedicated high temperature resistant VAT NT ink of DIC company；Table print protection gloss oil selects the dedicated GOP-500 of DIC company (HA) high temperature resistant gravure Gloss oil, gloss oil high temperature resistant, the viscous de-, wearability of resistance to heat-sealing, slip, resistance to blocking are excellent.Print speed printing speed 120-150m/min is dry 75-95 DEG C of temperature, mainly control dissolvent residual meets related request.

The purpose of primary coat be improve ink and aluminium foil adhesive strength, high temperature coating be coating layer is solidified it is thorough and molten Agent release is clean, table print-polishing oil be protect ink not by friction fall off and when high temperature heat seal it is boiling hot fall off, table print-polishing oil is resistance to The resin system of high temperature, and high rigidity, wearability are good.Print speed printing speed is lower compared with general thin printing, mainly ink, table print The solvent release of gloss oil is slower, needs reduction of speed to print, and promote drying temperature.

(5) present invention is by the innovation of PE film formulation and production technology, and the production consumption of the epiphragma is low, high yield rate, Application range is wide, and the fraction defective after boiling sterilizing is low, and the fraction defective from 2% can be reduced to 0.5%.

Specific embodiment

More specific detail is made to technical solution of the present invention below with reference to embodiment:

Raw material sources are as shown in table 1 below in following embodiment:

Table 1

Raw material	The trade mark	Manufacturer	Fusing point DEG C	Melt and refers to g/10min	Density g/cm3
						Low density polyethylene (LDPE)	2420H	Ba Saier	111	1.9	0.924
Medium density polyethylene	2038.68G	DOW Chemical	126	1.0	0.935
						High density polyethylene (HDPE)	HTA108	Exxon	135	0.7	0.961
Metallocene PE	SP4020	Mitsui Chemicals	127	1.8	0.937
						Adhesive	UK3640	Henkel	/	/	/
Silane coupling agent	VAT	Dainippon Ink Chemicals	/	/	/
						Ink	VATNT	Dainippon Ink Chemicals	/	/	/
Gloss oil	GOP-500(HA)	Dainippon Ink Chemicals	/	/	/