CN1663790A - Composite plastic film and processing technology thereof - Google Patents

Composite plastic film and processing technology thereof Download PDF

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Publication number
CN1663790A
CN1663790A CN 200510042160 CN200510042160A CN1663790A CN 1663790 A CN1663790 A CN 1663790A CN 200510042160 CN200510042160 CN 200510042160 CN 200510042160 A CN200510042160 A CN 200510042160A CN 1663790 A CN1663790 A CN 1663790A
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China
Prior art keywords
rete
plastic film
composite plastic
film
main component
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CN 200510042160
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Chinese (zh)
Inventor
孟繁寅
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Fuwei Films Shandong Co Ltd
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WEIFANG FUWEI PLASTIC CO Ltd
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Priority to CN 200510042160 priority Critical patent/CN1663790A/en
Publication of CN1663790A publication Critical patent/CN1663790A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a multiple plastic film and its processing technique. The film has the layer-shape structure, which at least comprises the first and the second film layers that are directly coextrusional composed and set border upon. The main contents of the first and the second film layers are one of two mutual non-dissolving plastic resins. The first film layer is on the surface of the multiple plastic films. The content of the first film layer is mainly polypropylene polymer, and the second film layer is polyester. The processing technique is: separately add the raw materials of each film layer in its own coextrusion machine, pass through coextrusion of the multiple film heads, the longitudinal and the transverse extension to get the multiple plastic films. The film layers of the invention have different performances and the border-upon layers are easily separated.

Description

A kind of composite plastic film and processing technology thereof
Technical field
The present invention relates to the plastic sheeting technical field, relate in particular to a kind of by the direct compounded composite plastic film of coextrusion process; The invention still further relates to the processing technology of making this composite plastic film.
Background technology
Along with the high speed development of petrochemical industry industry, the processing of plastic sheeting and application have also obtained promoting fast.From the material branch, plastic film material commonly used at present has PVC (polyvinyl chloride), PE (polyethylene), PP (polypropylene), PET (polyester), PA (polyamide) etc.From processing technology, curtain coating, blowing, biaxial tension etc. are arranged.From product structure, individual layer, multilayer or the like are arranged.The sandwich construction composite plastic film of producing by multi-layer co-extruded compound way, can make full use of the different performance that plastic resin (or claiming polymer) dissimilar and kind is had, remedied the single deficiency of single layer plastics films performance, therefore vast market prospect has been arranged.Multi-layer co-extruded compound be plastic film production process at present commonly used, its feature is: use first dissimilar and plastic resin kind of extruder more than two or two and compound die to be gathered together, have the membranaceous melt-flow that the multilayer different resins constitutes thereby form, to obtain the coextrusion composite film of two layers, three layers or multilayer through curtain coating cooling or biaxial tension.Because dissimilar have different compatibilities with the plastic resin of kind, and the resin of different compatibilities can not guarantee thermal welding securely together at compound tense.Listed the compatibility of several frequently seen plastic resin in the table 1.
Table 1
Neoprene ??PCDC ???PET ????PS ????Ny ????PP ??Surlyn ???EVA ????HDPE ????MDPE ????LDPE
????G ????B ???U ????U ????U ????B ????G ????G ????G ????G ????G ??LDPE
????G ????U ???U ????U ????U ????B ????G ????G ????B ????G ????G ??MDPE
????B ????U ???U ????U ????U ????U ????G ????G ????G ????B ????G ??HDPE
????G ????G ???U ????U ????U ????B ????G ????G ????G ????G ????G ??EVA
????G ????U ???(U) ????U ????G ????B ????G ????G ????G ????G ????G ??Surlyn
????B ????U ???U ????U ????U ????G ????B ????B ????U ????B ????B ??PP
????B ????U ???U ????G ????G ????U ????G ????U ????U ????U ????U ??Ny
????U ????U ???U ????G ????U ????U ????U ????U ????U ????U ????U ??PS
????U ????U ???G ????U ????U ????U ????U ????U ????U ????U ????U ??PET
????B ????G ???U ????U ????U ????U ????U ????G ????U ????U ????B ??PVDC
????G ????B ????U ????U ????B ????B ????G ????G ????B ????G ????G Neoprene
Annotate: G---excellent; B---as; U---bad; (U)---for the PET of certain kind.
At present, solving non-conforming plastic co-extrusion composite methods is to increase one deck to inconsistent two kinds of adhesive resins that resin is all compatible in the middle of inconsistent plastic resin layer, i.e. adhesive linkage, by coextru-lamination technology together with its hot melt.When producing plural layers by the coextru-lamination technology, people always wish that each plastic resin interlayer has good binding or bond properties.But this each resin bed is bonded together and the plastic sheeting made because each layer can not separate (mainly being the top layer), can not directly be suitable in the market " transfer aluminum plated " and " transfer laser mold pressing " and process needs.
Here, transfer aluminum plated elder generation exactly carries out vacuum aluminum-coated at film surface, then this layer aluminium coated transferred on other carrier surface.The transfer laser mold pressing is exactly to be molded into hologram image at film surface by processing earlier, then this laminar surface hologram image is transferred on other carrier surface.In order to realize " transfer aluminum plated ", common way is that (1) is earlier at the top layer of plastic sheeting coating abscission layer (peel ply) in the market.(2) carry out thereon more vacuum aluminum-coated.(3) and then coating transfer adhesive adhesion coating.(4) by transfer adhesive aluminium coated is transferred on other carrier.In order to realize " transfer laser mold pressing ", common way is that (1) is earlier at the top layer of plastic sheeting coating abscission layer (peel ply).(2) be coated with imaging layer more thereon.(3) and then carry out vacuum aluminum-coated.(4) press version to be molded into hologram image with hologram image.(5) coating transfer adhesive adhesion coating.(6) by transfer adhesive hologram image is transferred on other carrier.Above process is if hard the pressure named in mold pressing again after aluminizing earlier on the imaging layer usually.If first mold pressing is aluminized again on imaging layer, be " soft pressure " usually.Above process, it is complex process not only, and the cost height, and transfer mass also is difficult to guarantee.
Summary of the invention
First technical problem to be solved by this invention is: a kind of composite plastic film is provided, and its each rete not only has different performances, and realizes easily at least separating between two adjacent retes.
Second technical problem to be solved by this invention is: a kind of processing technology of making above-mentioned composite plastic film is provided, the plastic sheeting that utilizes this technology to make, its each rete not only has different performances, and realizes easily at least separating between the rete of two adjacent settings.
For solving above-mentioned first technical problem, technical scheme of the present invention is: a kind of composite plastic film, has layer structure, at least comprise in this layer structure direct coextru-lamination, and first rete and second rete of adjacent setting, the Main Ingredients and Appearance of described first rete and second rete is respectively a kind of in mutual exclusive two kinds of plastic resins.
Described first rete is positioned at the top layer of described composite plastic film.
The main component of described first rete is a polypropylene copolymer, and the main component of described second rete is a polyester homopolymer.
For solving above-mentioned second technical problem, technical scheme of the present invention is: a kind of processing technology of making composite plastic film may further comprise the steps:
A, be the earlier pre-crystallization of raw material of second rete of polyester homopolymer with main component,, be heated to be melt, after pre-filtering, measuring pump, the main filtration, enter the compound die head at the dry laggard main extruder of going into of drying tower;
B, be the raw material of first rete of polypropylene copolymer, put into the first secondary extruder, be heated to be and melt body, discharge moisture and oligomer, after pre-filtering, measuring pump, the main filtration, enter the compound die head main component.
C, be the raw material of the tertiary membrane layer of polyester homopolymer or polyester copolymer, put into the second secondary extruder, be heated to be and melt body, discharge moisture and oligomer, after pre-filtering, measuring pump, the main filtration, enter the compound die head main component.
Three layers that form in D, A, B and the C step melt body after compound die head flows out, and are cooled off rapidly by the chilling roller, form sheet;
After E, the sheet preheating, through longitudinal stretching and cross directional stretch, cut edge in the cooling back, and the rolling film forming is made finished product after cutting.
By above-mentioned direct coextru-lamination technology, because what main extruder was extruded is that Main Ingredients and Appearance is the resin melt of polyester homopolymer, what other two secondary extruders were extruded is the resin melt that Main Ingredients and Appearance is respectively polypropylene copolymer and polyester (homopolymerization or copolymerization), after it flows out from compound die head together, cool off rapidly by the chilling roller, form sheet, after this sheet preheating, through longitudinal stretching and cross directional stretch, will make three layers of composite plastic film that comprise first rete, second rete and tertiary membrane layer.Because dissimilar have different compatibilities with the plastic resin of kind, thermal welding is together securely and the resin of different compatibilities is at compound tense, polypropylene copolymer and polyester homopolymer belong to dissimilar and plastic resin kind, therefore first rete with still can separate after the second rete hot melt is compound.If upper surface evaporation aluminium coated at first rete, carry out the hologram image mold pressing then, coating is thereon shifted and is sticked with glue layer again, just can separate first rete from second rete at an easy rate, thereby the hologram image embossed plies of ground floor face (laser molding layer, or claim laser embossed plies etc.) can be transferred on other carrier.
The specific embodiment
A kind of composite plastic film, being combined with each other by three retes forms layer structure, and the upper strata is first rete, and the centre is second rete, and lower floor is the tertiary membrane layer.Wherein the main component of first rete is a polypropylene copolymer, and the Main Ingredients and Appearance of second rete is a polyester homopolymer, and the Main Ingredients and Appearance of tertiary membrane layer is polyester (homopolymerization or copolymerization).The additive that contains the smooth property that can improve film in the above-mentioned rete, the concentration of additive in first rete are 300～800ppm by weight; The concentration of additive in second rete is 0～1000ppm by weight, and the concentration of additive in the tertiary membrane layer is 300～1000ppm by weight.The main component of additive is a silica, also can be other composition such as titanium dioxide or kaolin or calcium phosphate or barium sulfate etc.
Overall film thickness is 16 μ m, and wherein the thickness of first rete is 1.0～2.5 μ m, and the thickness of second rete is 11 μ m～15 μ m, and the thickness of tertiary membrane layer is 1.0～2.5 μ m.
As required, first, the thickness of tertiary membrane layer also can be controlled at respectively within the scope of 0.5 μ m～10 μ m, by adjusting the thickness of two retes, the gross thickness of film can be adjusted in the scope of 8 μ m～200 μ m; Generally, overall film thickness is generally 12 μ m～36 μ m.Specifically, when being used as the aluminium coated transfer vector, the thickness of first rete is about 1.5 μ m; When being used as hologram image embossed plies transfer vector, the thickness of first rete is about 2 μ m.
Above-mentioned composite plastic film can be realized by following processing step:
A, will be by weight the raw material of second rete formed of 40%～60% bright PET chips, 10%～30% the polyester slice that contains additive (concentration of additive is 3000ppm by weight in this polyester slice) and 10%～50% recovery granulation section mix back crystallization in advance earlier, enter the drying tower drying and cut into slices after 2.5～4 hours, humidity is controlled at about 30ppm; Dried raw material enters main extruder, is heated to be melt, enters the compound die head after pre-filtering, measuring pump, the main filtration;
B, raw material and main component that 80～95% polypropylene copolymers and 5～20% are contained first rete that the polypropylene copolymer of additive forms are the raw materials of the tertiary membrane layer of polyester (homopolymerization or copolymerization), enter each self-corresponding double screw extruder respectively, be heated to be and melt body, discharge moisture and oligomer, after pre-filtering, measuring pump, the main filtration, enter the compound die head.
Form in C, A and the B step three layers melt body after compound die head flows out, and are cooled off rapidly by the chilling roller, form sheet, and described sheet is successively through preheating, vertically do 3.5 times of stretchings.
Sheet behind D, the longitudinal stretching successively through laterally preheating zone preheating, laterally do 3.5 times of stretching, setting, cool off.
After E, the film cooling, through thickness measuring, side cut, elimination static and rolling film forming.
More than be the processing technology that adopts the two-step stretch method, by the chilling roller cool off rapidly forms sheet after, also can adopt the synchro-draw method of carrying out the vertical and horizontal stretching simultaneously.Certainly, adopt casting technique also can realize same effect.
The gross thickness of preparing by above-mentioned process conditions is the composite plastic film of 16 μ m, and its performance indications representative value sees Table 2.
Table 2
Project Unit Test value Method of testing
Hot strength Longitudinal stretching ????N/mm 2 ????220 ? ????DIN53455
Cross directional stretch ????N/mm 2 ????220
Elastic modelling quantity Longitudinal stretching ????N/mm 2 ????4000
Cross directional stretch ????N/mm 2 ????4200
Elongation at break Longitudinal stretching ????％ ????140
Cross directional stretch ????％ ????130
Percent thermal shrinkage Longitudinal stretching ????％ ????1.5 ????150℃/30min
Cross directional stretch ????％ ????0.2
Mist degree ????％ ????3 ????ASTM?D1003
Glossiness ????％ ????130 ????ASTM?D2457
Coefficient of friction ????μs/μk ????0.50/0.40 ????DIN53375
Light transmittance ????％ ????88
Wetting tension ????Mn/m ????AST?M?D2578
Molding temperature ????℃ ????100℃-200℃
Peeling force between the ground floor and the second layer Use common polyester adhesive tape to glue
Disclosed composite plastic film is not limited to three retes, also can be 2 layers, 5 layers, 7 layers, but be at least two-layer.The employed primary raw material of adjacent film layers also is not limited to polyester homopolymer and polypropylene copolymer; as long as include rete that is directly compound and adjacent setting after two co-extrusions in the composite plastic film; and its Main Ingredients and Appearance is respectively a kind of in mutual exclusive two kinds of plastic resins; will fall within protection scope of the present invention; a rete in these two retes preferentially is positioned at the top layer of composite plastic film; so that evaporation aluminium coated or contour forging image layer thereon, realize the separating of another rete in two retes of aluminium coated or contour forging image layer and this easily.The concentration of additive in its rete separately is not limited to the number range in the foregoing description, facts have proved, and all be feasible within 0～1500ppm.

Claims (10)

1, a kind of composite plastic film, has layer structure, at least comprise in this layer structure direct coextru-lamination, and first rete and second rete of adjacent setting, it is characterized in that: the Main Ingredients and Appearance of described first rete and second rete is respectively a kind of in mutual exclusive two kinds of plastic resins.
2, a kind of composite plastic film as claimed in claim 1, it is characterized in that: described first rete is positioned at the top layer of described composite plastic film.
3, a kind of composite plastic film as claimed in claim 2, it is characterized in that: the main component of described first rete is a polypropylene copolymer, the main component of described second rete is a polyester homopolymer.
4, a kind of composite plastic film as claimed in claim 3 is characterized in that: contain the additive that can improve the smooth property in plastic sheeting surface in described first rete, its main component is silica or titanium dioxide or kaolin or calcium phosphate or barium sulfate.
5, as claim 3 or 4 described a kind of composite plastic films, it is characterized in that: contain the additive that can improve performance of plastic film in described second rete, its main component is silica or titanium dioxide or kaolin or calcium phosphate or barium sulfate.
6, a kind of composite plastic film as claimed in claim 5 is characterized in that: layered structure is three layers, and second rete is compounded with the tertiary membrane layer the compound apparent surface of itself and first rete.
7, a kind of composite plastic film as claimed in claim 6 is characterized in that: the main component of described tertiary membrane layer is polyester homopolymer or polyester copolymer.
8, a kind of composite plastic film as claimed in claim 7 is characterized in that: the thickness of described composite plastic film is 12～36 μ m, and wherein the thickness of first rete is 0.5～2.5 μ m, and the thickness of tertiary membrane layer is 0.5～2.5 μ m.
9, make the processing technology of a kind of composite plastic film as claimed in claim 6, may further comprise the steps:
A, be the earlier pre-crystallization of raw material of second rete of polyester homopolymer with main component,, be heated to be melt, after pre-filtering, measuring pump, the main filtration, enter the compound die head at the dry laggard main extruder of going into of drying tower;
B, be the raw material of first rete of polypropylene copolymer, put into the first secondary extruder, be heated to be and melt body, discharge moisture and oligomer, after pre-filtering, measuring pump, the main filtration, enter the compound die head main component.
C, be the raw material of the tertiary membrane layer of polyester homopolymer or polyester copolymer, put into the second secondary extruder, be heated to be and melt body, discharge moisture and oligomer, after pre-filtering, measuring pump, the main filtration, enter the compound die head main component.
Three layers that form in D, A, B and the C step melt body after compound die head flows out, and are cooled off rapidly by the chilling roller, form sheet;
After E, the sheet preheating, through longitudinal stretching and cross directional stretch, cut edge in the cooling back, and the rolling film forming is made finished product after cutting.
10, the processing technology of a kind of composite plastic film as claimed in claim 9 is characterized in that: sheet carries out longitudinal stretching earlier after preheating, carry out cross directional stretch again.
CN 200510042160 2005-03-14 2005-03-14 Composite plastic film and processing technology thereof Pending CN1663790A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101879805A (en) * 2010-06-01 2010-11-10 中山博锐斯塑胶新材料有限公司 Multilayer film production equipment and multilayer film production method
CN105729966A (en) * 2016-03-01 2016-07-06 山东丰华塑胶科技有限公司 High-elongation biaxially oriented polyester film and preparation method thereof
WO2018103012A1 (en) * 2016-12-07 2018-06-14 吕尚文 Microstructure transfer film manufacturing method and microstructure transfer film
CN108162423A (en) * 2016-12-07 2018-06-15 吕尚文 The manufacturing method of micro-structure transfer membrane and micro-structure transfer membrane
CN111958683A (en) * 2020-08-18 2020-11-20 闽江学院 Automatic edge cutting and stacking transfer device for paper film products
CN113910730A (en) * 2021-10-13 2022-01-11 苏州康乐兴电子有限公司 Preparation method of composite plastic

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101879805A (en) * 2010-06-01 2010-11-10 中山博锐斯塑胶新材料有限公司 Multilayer film production equipment and multilayer film production method
CN101879805B (en) * 2010-06-01 2012-10-17 中山博锐斯塑胶新材料有限公司 Multilayer film production equipment and multilayer film production method
CN105729966A (en) * 2016-03-01 2016-07-06 山东丰华塑胶科技有限公司 High-elongation biaxially oriented polyester film and preparation method thereof
WO2018103012A1 (en) * 2016-12-07 2018-06-14 吕尚文 Microstructure transfer film manufacturing method and microstructure transfer film
CN108162423A (en) * 2016-12-07 2018-06-15 吕尚文 The manufacturing method of micro-structure transfer membrane and micro-structure transfer membrane
CN111958683A (en) * 2020-08-18 2020-11-20 闽江学院 Automatic edge cutting and stacking transfer device for paper film products
CN111958683B (en) * 2020-08-18 2021-12-07 三明市缘福生物质科技有限公司 Automatic edge cutting and stacking transfer device for paper film products
CN113910730A (en) * 2021-10-13 2022-01-11 苏州康乐兴电子有限公司 Preparation method of composite plastic

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