CN101905775A - Adhesive-free paper plastic compounded super-thin two-way stretching BOPP membrane - Google Patents
Adhesive-free paper plastic compounded super-thin two-way stretching BOPP membrane Download PDFInfo
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- CN101905775A CN101905775A CN2010101363907A CN201010136390A CN101905775A CN 101905775 A CN101905775 A CN 101905775A CN 2010101363907 A CN2010101363907 A CN 2010101363907A CN 201010136390 A CN201010136390 A CN 201010136390A CN 101905775 A CN101905775 A CN 101905775A
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Abstract
The product of the invention belongs to production extension of polypropylene two-way stretching technology in plastics, belonging to functional thin film. The product is mainly used in paper plastic compounding and plastic compounding as well as paper plastic compounding for printing and can be directly compounded with paper, preprinting paper or another thin film compounded functional layer, such as books, top grade paper box wrappage, publicity pictorial and the like. The adhesive-free paper plastic compounded super-thin two-way stretching BOPP membrane is prepared by adopting the manner of five layer coextrusion and subbing by line coating, the thickness thereof is 12-14Mum, under certain temperature and pressure, the membrane can be directly adhered with paper without glue, and configuration of baking channel, manpower, electric consumption and glue which are necessary for the traditional process is not required. The thin film comprises a corona layer, a middle layer A, a middle layer B, a middle layer C and a heat sealing layer which are sequentially arranged and are subject to two-way stretching.
Description
One, technical field
The present invention relates to the functional film in the packing, be mainly used in paper and be laminated with, can be directly and paper wood, preprint paper wood or contain being laminated with of functional layer that another film of this layer is laminated with.
Two, background technology
Traditional film coating technique has oil-based solvent type gluing formula overlay film, and the precoating formula overlay film of aqueous solvent type gluing formula overlay film and heat pressing process overlay film has continued the market more than ten years.The above two use toluene etc. to dilute as solvent, and in the overlay film course of processing, solvent needs discharge behind oven drying.Therefore, exist organic solvent contamination environment, harmful to human is healthy and residual solvent continue to produce problems such as harmful effect; The production technology that the latter adopts is the same with the oily gum coating technique, and the operation of technology is numerous and diverse, will carry out aborning that glue storage, carrying, glue are transferred and converted, glue coating and oven dry; During through drying tunnel, all must open drying tunnel (temperature is 70～100 ℃) after the gluing, as far as possible with water, alcohols, ester class, the oven dry of ammoniacal liquor class equal solvent (three all belong to European Union etc. is strict to be detected and the VOC of control).This opens high-power heating with regard to needs and drying system is successively worked, and needs to consume a large amount of energy to guarantee required temperature, the situation of further having aggravated present power tense.Coating technique is introduced China in the seventies in 20th century. and what at first introduce is that oil-based solvent type glue promptly is coated with the formula coating technique.Because the toluene in the solvent has harm and environmental pollution serious to human body. after use water-base cement again instead and promptly be coated with formula coating technique (promptly adopting water-based acrylic acid ester adhesive).Fall behind because the paper hygroscopic property reaches equipment for coating film by force, the tension force of film and paper is difficult for adjusting. and quality problems are difficult to solve.
China is since the introduction of phase early 1990s and use the pre-coating film coating technique, and has introduced advanced pre-coating film equipment for coating film from American-European countries at the beginning of 2000.Aspect environmental protection and product processing quality, this technology is all promptly filmed much advanced more in the past than the oiliness or the water-base cement that use.Shortcoming involves great expense exactly.
Pre-coating film coating technique characteristics
(1) technology environmental protection: use the EvA hot melt adhesive, can not produce harm to environment and human body; There is not the influence of paper and printing ink to compound film quality. pollution-free, low-loss. products such as processable food package box and children's book.
(2) reliable in quality: be difficult for to produce gauffer, bubble curls and paper and divided thin film from etc. phenomenon.
(3) easy to use: as to have only paper feed during overlay film, advance film, cut apart three operations, no gluing drying nest; Pre-coating film cover set out that equipment volume is little, price is low, easy and simple to handle.Weak point is the cost height, and the covering material price is about 0.60 yuan/meter, and general printing is beyond affordability.If can effectively improve on price, the demand in market will be very big.
The overlay film characteristics of the hydrosol: the water-base cement film layer by support, continuous mechanism of paper, glue spreading system, glue spreading apparatus, be laminated with mechanism, electrical control gear, rolling is released system and coating materials and is cut etc. and partly to form fast.Its principle of work is: coating materials is after carving knife is cut, enter between going into of gluing steel rider and gluing rubber rollers by guide reel, two rollers are coated on the hydrosol on the coating materials equably thus, after the paper of sending here with load-transfer device is joined, be laminated with roller through two pairs and be laminated with, again by packing up rolling by the collection roller behind the collection deflector roll.
This equipment motor adopts high-frequency timing, stable performance, is provided with the automatic cutting film, lacks paper shutdown automatically, automatic guidance glue, paper perforation, finished product rolling release disposal system fast; what adhesives used during overlay film is water soluble glue; market SR (water-soluble glue) FM (multiple mould machine) equipment has SRFM---and the type supply of specification models such as 720,900,1100 is that the most perfect current multiple film is crossed gluing equipment.The adhesives that overlay film is used is the intermediate material that printed matter and plastic sheeting are laminated with, and mainly plays cohesive action, allows plastic sheeting and paper printing matter organically combine.Adhesives generally is made up of material of main part and auxiliary material; The material of material of main part has synthetic resin, neoprene, natural high molecular substance and mineral compound; Auxiliary material in order to improve bulk material properties or to be convenient to construct and the material that discharges, mainly contain curing agent, plasticizer, Charge, solvent etc. in adhesives, the adhesives one that overlay film uses is solvent type adhesive.
In the water-base cement coating technique, be to be water type (emulsion-type) adhesives of solvent with water.This water-based (emulsion) adhesion agent is to form oil-in-water organic liquid by 55% water or the aqueous system (water) and 45% organic facies (oil phase) under the effect of emulsifying agent.This is that the adhesives of solvent has penetrating odor with water, and this binder main body material is only limited to the macromolecule resin that can disperse in water, thereby plastic sheeting, equipment for coating film etc. is all had relatively high expectations, and bond properties is stable not ideal.Mostly use the method overlay film on the now domestic market.
The coating technique perspectivity of market brings a lot of troubles to processing enterprise behind China's original adoption oil-based solvent type glue coating technique, quality has become the most troubling problem, and more than 20 year all really is not resolved.Situation slightly take a favorable turn after the pre-coating film overlay film having occurred, but its cost higher, can not popularize preferably.PUR glue is that compound film quality and productive costs all had taken a turn for the better after coat film technology occurred.With regard to present circumstances, this equipment for coating film has only " Switzerland Stanley cover " company to produce, and price is higher, only is applicable to professional overlay film enterprise and the enterprise of processing business in enormous quantities is arranged.
Present domestic overlay film processing enterprise is ten hundreds of, and the whole nation is annual publishes has 40% book cover to adopt coating technique approximately in the seal dress books and periodicals, and multi-form packing box also uses overlay film in a large number, is not damaged to keep its fineness, careful appearance.Also be not resolved although paper separates the recovery problem, the application of oil-based solvent type glue coating technique does not also improve fully, and the number of applications of domestic coating technique is also in continuous increase.It is reported that part printing packaging enterprise is so far also at a large amount of solvent-borne type glue coating techniques that use.For example, in Zhejiang area, the boss of a printing enterprise ignores to the healthy harm of workman with to the pollution of environment for cost-cutting, a large amount of solvent-borne type glue coating techniques that use, for escape the responsibility that should bear adopt 3 years rotation systems advertise for workers (because the long-term solvent contact section bar of IA material may cause leukaemia after 3～4 years) also have many such examples.This shows solvent-borne type glue coating technique superseded imperative.
Three, summary of the invention
The principal feature of adhesive-free paper plastic compounded super-thin two-way stretching BOPP film is to need not intermediate adhesive such as glue when being laminated with paper, a lot of links in the middle of having saved, just adopt hot pressing form and paper to be laminated with together, and the thickness of our product has been accomplished 12 μ m-14 μ m, we adopt the method for five-layer co-squeezing concrete technology, be after polymeric resin is extruded sheet by the extruder heating and melting, more than glass temperature, the proper temperature scope interior (under the elastomeric state) that fusing point is following, during by vertical machine drawing and transverse stretching machine, under external force, longitudinally and laterally carry out the stretching of certain multiple successively, thus make the strand of poly-mer or crystal plane be orientated on the direction of thin film planar and arrange in order being parallel to; Carrying out thermal finalization then under tension is fixed up the macromolecular structure of orientation; After cooling and subsequent treatment just can make desirable plastic sheeting.
Film comprises the corona layer through biaxial tension that is provided with in turn, middle A layer, middle B layer, middle C layer and hot sealing layer composition.Corona processing layer is that extrude behind the metallocene polymers being added with of making of co-polypropylene have the concavo-convex film of microcosmic through the high-frequency discharge surface treated by blend.Middle a layer, middle B layer are the composite material of the random ternary polymerization of propylene/ethylene/butene, propene-1-butene copolymer or known heat-sealable materials such as olefin copolymer; The cross-linked acrylic acid methyl esters is as anti-adhering material, add heat-sealing type material such as 3%-60% propene-1-butene copolymer or known olefin copolymer or elastic body, 40%-97% homo-polypropylene in the hot sealing layer, add the oleamide that accounts for homo-polypropylene base material total weight 0.1～0.3%, and add alkyl (C14-18) two (2-ethylol) amine that accounts for homo-polypropylene base material total weight 0.1～0.3%.The additive that adds petroleum resin intensity strengthening agent silicon dioxide again.
The adhesive-free paper plastic compounded super-thin two-way stretching BOPP film can be accomplished 12 μ m, and the equipment aspect mainly is that we have adopted the special extruding technology of DMT twin screw, and domestic producer adopts common double screw rod extruding technology mostly.Common double screw extrusion machine generally is used to raw material to be mixed, and also can be used for masterbatch production, but its technological requirement is much simpler than the double screw extrusion machine through particular design.Usually, the screw diameter of common double screw extruder is bigger, thereby can cover a plurality of applications.Yet, when hanging down extrusion capacity production, owing to will avoid metal and metallo-direct contact take place between screw rod and machine barrel, so the use of major diameter screw rod just is restricted.In addition, the common screw of not considering specific (special) requirements causes that easily shorten the service life of thrust bearing.Therefore, DMT has carried out particular design to screw rod, thereby has realized identical output with the less screw rod of diameter, demonstrates great advantage in the adhesive-free paper plastic compounded super-thin two-way stretching BOPP film production.For example, can only produce the extrusion screw rod that is low to moderate 15 μ m films with other and compare, the screw rod of DMT particular design can be produced the film that is low to moderate 12 μ m and 8 μ m.
The purposes of domestic Biaxially oriented polypropylene (BOPP) film is very extensive, and paper is laminated with the aspect and occupies 30% consumption.Production technology is that the melt of high molecular polymer or solution are at first made sheet material or thick film by long and narrow head, then in the stretcher of special use, under the speed of certain temperature and setting, simultaneously or the stretching on vertical both direction (vertically, laterally), carried out of substep, and the film of making through suitable cooling or heat treatment or special processing (as corona treatment, coating etc.).Then be called one-off drawing method or synchro-draw method if on both direction, stretch simultaneously, then be called one by one pulling method or step drawing method on both direction if substep stretches.
The production technology that most companies adopt is a plane drawing process one by one, and this kind technology can be produced the film that single or multiple lift is laminated with structure.Being laminated with film (ABA, ABC) with three layers is example, it is big to be laminated with film layers of material performance difference, every kind of material all needed separately independently process systems before entering head, the melt material of inside and outside layer converged before head, made to extrude to be laminated with sheet material.
The thickness of adhesive-free paper plastic compounded super-thin two-way stretching BOPP film is accomplished 12 μ m-14 μ m, and the thin more yield rate of product is low more in the production of serialization, and film is easy more adhesion in rewinding.Solving our way of film blocking problem is, add a certain proportion of anti blocking agent on the top layer of adhesive-free paper plastic compounded super-thin two-way stretching BOPP film, add and account for the cross-linked acrylic acid methyl esters of homo-polypropylene base material total weight 3.0～5.0% particle diameters 2 μ m as anti-adhering material, its mechanism is, because anti blocking agent and pp material are incompatible, and, can guarantee like this in the film production process, to melt extrude Shi Buhui and melted than polypropylene fusing point height.The particle diameter of anti blocking agent is generally at 3～5 μ m, and the skin depth of film is about 1 μ m, like this after the film forming, these anti blocking agents form many projections on the surface of film, or the different lax shapes of appearance is concavo-convex, make the surface of film become coarse, can retain air in certain amount between layer and the layer, thereby play the inter-adhesive effect between layer and the layer that prevents.
The tinuous production drying tower that the adhesive-free paper plastic compounded super-thin two-way stretching BOPP film line is made up of plurality of devices, extruder, casting sheet machine, longitudinal stretching machine, cross directional stretch machine, traction winder etc.Its production procedure is longer, and technology is more complicated also.Flowing and rheological behaviour of poly-mer: whole process is poly-mer flowing in pipe, polymer melt flowing in slit conduit, the drag flow of poly-mer, the convergence of polymer melt flow and melt from the film expansion behavior.These all are derived from our novel process and renovating of equipment, the thickness of adhesive-free paper plastic compounded super-thin two-way stretching BOPP film the thinnest we can accomplish 12 μ m, residing state of its high molecular polymer and phase co-conversion are exactly the processing, the condition precedent of application of decision finished product.In whole forming process, viscosity increases vulnerable part in such film or the zone of stress concentration is unlikely to break, and has improved the product thickness homogeneity.
Five, the specific embodiment
We adopt the method for five-layer co-squeezing concrete technology, be after polymeric resin is extruded sheet by the extruder heating and melting, in the proper temperature scope more than glass temperature, below the fusing point (under the elastomeric state), during by vertical machine drawing and transverse stretching machine, under external force, longitudinally and laterally carry out the stretching of certain multiple successively, thus make the strand of poly-mer or crystal plane be orientated on the direction of thin film planar and arrange in order being parallel to; Carrying out thermal finalization then under tension is fixed up the macromolecular structure of orientation; After cooling and subsequent treatment just can make desirable plastic sheeting.
Claims (2)
1. adhesive-free paper plastic compounded super-thin two-way stretching BOPP film adopts five layers to amount to system, online biaxial tension with drench the film hot sealing layer and carry out simultaneously, its thickness is 12 μ m-14 μ m.
2. film comprises the corona layer through biaxial tension that is provided with in turn, middle A layer, middle B layer, middle C layer and hot sealing layer composition.
The A corona processing layer: blend is extruded behind the metallocene polymers has the concavo-convex film of microcosmic through the high-frequency discharge surface treated for being added with of making of co-polypropylene.
A layer, middle B layer in the middle of the B: be the composite material of the random ternary polymerization of propylene/ethylene/butene, propene-1-butene copolymer or known heat-sealable materials such as olefin copolymer; The cross-linked acrylic acid methyl esters is as anti-adhering material.
Add heat-sealing type material such as 3%-60% propene-1-butene copolymer or known olefin copolymer or elastic body, 40%-97% homo-polypropylene in the C hot sealing layer, add the oleamide that accounts for homo-polypropylene base material total weight 0.1～0.3%, and add alkyl (C14-18) two (2-ethylol) amine that accounts for homo-polypropylene base material total weight 0.1～0.3%.The additive that adds petroleum resin intensity strengthening agent silicon dioxide again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101363907A CN101905775A (en) | 2010-03-31 | 2010-03-31 | Adhesive-free paper plastic compounded super-thin two-way stretching BOPP membrane |
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| CN2010101363907A CN101905775A (en) | 2010-03-31 | 2010-03-31 | Adhesive-free paper plastic compounded super-thin two-way stretching BOPP membrane |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541631A (en) * | 2016-12-09 | 2017-03-29 | 闽南师范大学 | A kind of new super-hydrophobic CPP thin film and preparation method thereof |
| CN110757848A (en) * | 2018-07-25 | 2020-02-07 | 泉州利昌新材料科技有限公司 | Method for manufacturing synthetic paper |
| CN110757925A (en) * | 2019-10-09 | 2020-02-07 | 安徽国风塑业股份有限公司 | BOPP film for high-temperature cooking compounding and preparation method thereof |
| CN110920192A (en) * | 2019-11-15 | 2020-03-27 | 安徽国风塑业股份有限公司 | Metalized double-sided corona BOPP extinction heat-sealing film and preparation method thereof |
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| CN1284668C (en) * | 2003-07-30 | 2006-11-15 | 海南赛诺实业有限公司 | Biaxial stretching polypropylene contraction single film and its preparation method |
| CN100446970C (en) * | 2005-11-28 | 2008-12-31 | 申达集团有限公司 | Five layer co-extruding biaxial stretched synthetic PP paper and its prepn process |
| CN100548670C (en) * | 2007-08-16 | 2009-10-14 | 广东德冠包装材料有限公司 | A kind of paper plastic glue-free composite off line repeated spraying bidirectional stretching polypropylene film |
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2010
- 2010-03-31 CN CN2010101363907A patent/CN101905775A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1284668C (en) * | 2003-07-30 | 2006-11-15 | 海南赛诺实业有限公司 | Biaxial stretching polypropylene contraction single film and its preparation method |
| CN100446970C (en) * | 2005-11-28 | 2008-12-31 | 申达集团有限公司 | Five layer co-extruding biaxial stretched synthetic PP paper and its prepn process |
| CN100548670C (en) * | 2007-08-16 | 2009-10-14 | 广东德冠包装材料有限公司 | A kind of paper plastic glue-free composite off line repeated spraying bidirectional stretching polypropylene film |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541631A (en) * | 2016-12-09 | 2017-03-29 | 闽南师范大学 | A kind of new super-hydrophobic CPP thin film and preparation method thereof |
| CN110757848A (en) * | 2018-07-25 | 2020-02-07 | 泉州利昌新材料科技有限公司 | Method for manufacturing synthetic paper |
| CN110757925A (en) * | 2019-10-09 | 2020-02-07 | 安徽国风塑业股份有限公司 | BOPP film for high-temperature cooking compounding and preparation method thereof |
| CN110920192A (en) * | 2019-11-15 | 2020-03-27 | 安徽国风塑业股份有限公司 | Metalized double-sided corona BOPP extinction heat-sealing film and preparation method thereof |
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Open date: 20101208 |