The biaxial stretching polyester pre-coating film
The utility model relates to printing film coating technique field, and particularly the important materials pre-coating film of overlay film is a kind of pre-coating film that adopts the extrusion composite technology technology to make.
The printed matter overlay film is the important means of post-press finishing, the final personal value of its decision print product.The coating technique of printed matter is meant with plastic sheeting and covers above the paper printing matter, the middle adhesive that uses, after the heating pressurized treatments, two kinds of materials of different nature of plastic sheeting and paper are bonded together, form paper/the mould incrustation process technology of unification.It plays protection and decorative effect to printed matter, is widely used in the packages printing field, on the Surface Machining as Front cover of book and periodical, propaganda picture album, map, advertising specialty bag, senior packing box etc.Overlay film can divide promptly films and two kinds of pre-coating films.
Promptly be coated with membrane technology and be that the international sixties rise to coating technique behind the seal of printed matter, package.But this technology is directly used in the overlay film process and is contained benzene solvent, thereby has brought the three big drawbacks that can't overcome owing to self technology:
(1) environmental issue: because the volatilization of noxious material benzene and overflowing has caused air pollution and brought very big harm for the producer and user's health; Simultaneously, the harmful substance that residues in the overlay film has harmful effect to consumer's health.
(2) quality problems: owing to still have volatile substance benzene constantly to overflow after the overlay film processing, very easily between film and paper, form bubble, make printing product surface be vaporific, influence fineness, definition and the colour vividness of printing; Sometimes because of bonding strength is not enough, even cause cracking, fold and demoulding.In addition, the production equipment automaticity of promptly filming is low, has reduced the overlay film yield rate.
(3) safety problem: owing to contain volatile organic solvent benzene in the solution, form flammable, explosive atmosphere easily around the liquid bath, and the plastic basis material that the uses generation static that rub causes disaster hidden-trouble in operation process.Such accident number had taken place, and little then the shutdown stops production, and greatly then machine burns, and factory building caves in, casualties.
The pre-coating film film coating technique is the green technology of sustainable development.The pre-coating film film coating technique also can be referred to as environmental friendliness technology or clean technologies, has realized the protection environment, protects the health, has kept the safety in production.In pre-coating film production and the use, the volatilization that toxic gas does not take place is polluted, and therefore, effectively improves working environment, eliminates the disaster hidden-trouble that production site and product are stored; Use the pre-coating film product,, can be widely used on the packing of books and periodicals (especially student textbook), food, tobacco and wine, medicine etc. the consumer not being constituted potential threat owing to wherein do not have the hazard residue material; The process procedures such as allotment, coating and oven dry of binder have been saved simultaneously, the whole film covering process can in seconds be finished, and can not produce pollution to environment, does not have disaster hidden-trouble, do not need to clean automatic double surface gluer etc. yet, can realize high speed, efficient, high-quality overlay film; Pre-coating film has promoted the color saturation of printed matter and definition, has obviously increased its artistic effect; and printed matter played a protective role; make it water-fast, moisture resistance, fast light, prevent pollution, anti-chemical corrosion; increase the service life; improve durability, collection and the ornamental value of printed matter greatly, promoted the commercial competitiveness and the added value of product.
Pre-coating film structure difference, adopt the base material difference different with hot melt adhesive layer, the performance of pre-coating film product has very big-difference, and the effect of product also has very big difference behind the overlay film, as aspects such as color saturation, brightness, tensile strength, wide degree, flatness.
The utility model content
The purpose of this utility model is: a kind of biaxial stretching polyester (BOPET) pre-coating film is provided, improve the exquisite degree of printing, constant product quality, not only environmental protection, safe, convenient, fast, can discontinuousization (sporadicly) overlay film, and can satisfy some clients to overlay film after product requirement have high color saturation, high-tensile, high wide degree, high-flatness, demand with low cost.Owing to not with an organic solvent, do not overcome the deficiency of promptly filming and existing.
The technical solution adopted in the utility model is: biaxial stretching polyester (BOPET) pre-coating film, comprise base material, intermediate layer and hot melt adhesive layer, it is characterized in that: on the surface of base material intermediate layer and hot melt adhesive layer are arranged successively, the width of base material, intermediate layer and hot melt adhesive layer is identical.Base material is biaxially oriented polyester film (BOPET), and the intermediate layer is polymine (PEI), and hot melt adhesive layer is the LDPE PUR.Intermediate layer and hot melt adhesive layer evenly apply successively, are compounded on the surface of base material.The thickness of base material is between the 10.8-25 micron, and (coated weight is 0.009-0.011g/m to the thickness in intermediate layer at the 0.01-0.03 micron
2) between, the compound thickness of hot melt adhesive layer is between the 15-70 micron.
Technical scheme is preferably: the thickness of base material is between the 11-25 micron, and (coated weight is 0.009-0.01g/m to the thickness in intermediate layer at the 0.01-0.02 micron
2) between, the thickness of hot melt adhesive layer is between the 20-65 micron.
The composite production line that utilizes extruder and equipment complex to form is coated in the intermediate layer on the surface of base material, at last hot melt adhesive layer is compounded on the intermediate layer, produces biaxial stretching polyester (BOPET) pre-coating film.After the thickness of base material and LDPE hot melt adhesive layer carries out suitable combination, can obtain different products.Above-mentioned extruder and equipment complex and combination process are well known to those skilled in the art.
The density of LDPE PUR is about 0.918g/cm3.Degree of crystallinity is lower, and molecular weight is general 5～500,000, is the waxy solid resin that a kind of milky is translucent, and is nontoxic.Softening point is lower, and surpassing softening point is fusion, and its thermal welding, moulding processability are fine, and flexibility is good, and toughness, lower temperature resistance are fine, fusing point: 108 ℃, and particle diameter: 40--80 order.At present, coating grade LDPE PUR product all has supply both at home and abroad, but home products quality stability slightly is worse than imported product.
Polymine (PEI) molecular formula is: [CH
2NH-] n, there is the product supply in Shanghai DiC Ink Co., Ltd, and the utility model adopts U.S.'s imported product.
The beneficial effects of the utility model: biaxial stretching polyester (BOPET) pre-coating film, with biaxially oriented polyester film (BOPET) as base material, with the pre-coating film of LDPE PUR as hot melt adhesive layer, have high color saturation, high-tensile, high wide degree, high-flatness, cheap characteristics, improved the exquisite degree of printing.Mainly use small-sized overlay film user and campus internal implementation overlay film.Biaxial stretching polyester (BOPET) pre-coating film constant product quality, and have environmental protection, safe, convenient, fast, can discontinuousization (sporadicly) overlay film advantage, can satisfy some clients to overlay film after product requirement.Owing to not with an organic solvent, do not overcome the deficiency of promptly filming and existing.Its product will have the field of above-mentioned requirements to be more widely used in small-sized overlay film user and inside, campus etc.
Description of drawings
Fig. 1 is biaxial stretching polyester (BOPET) pre-coating film cross section structure schematic diagram.
Among the figure, 1. base material, 2. intermediate layer, 3. hot melt adhesive layer.
The specific embodiment
Embodiment 1: with width is that 1300 millimeters biaxial stretching polyester (BOPET) pre-coating film is an example, is elaborated.
Consult Fig. 1.Biaxial stretching polyester (BOPET) pre-coating film width is 1300 millimeters.Base material 1, intermediate layer 2 are identical with the width of hot melt adhesive layer 3.Biaxial stretching polyester (BOPET) pre-coating film haves three layers, and ground floor is a base material 1, and the second layer is that the intermediate layer is a hot melt adhesive layer 3 for 2, the three layers.Former base material adopts biaxially oriented polyester film (BOPET), 1320 millimeters of width.Intermediate layer 2 is polymine (PEI), and hot melt adhesive layer 3 is LDPE PURs.Intermediate layer 2 and hot melt adhesive layer 3 evenly apply successively, are compounded on the surface of base material 1, and through the side cut system, both sides of the edge are cut off 20 millimeters altogether behind the composite hot melt glue-line 3, and final products will be narrower 20 millimeters than the width of former base material.At the fabric width edge, thickness deviation≤2 micron.11 microns of the thickness of base material 1, (coated weight is 0.009-0.01g/m to the thickness in intermediate layer 2 at the 0.01-0.02 micron
2) between, the thickness of hot melt adhesive layer 3 is 26 microns.