Background technology
Along with the development of packaging field, the wrapped product meeting the needs of different industries miscellaneous emerges in an endless stream.Common packed flexible packaging industry, the can packing field of various material, Industrial products packaging field, the sealed membrane used in building packaging field etc. is different, generally comprise false proof to the performance requirement of sealing membrane, nontoxic, high-low temperature resistant, resistance to boiling, anti-electrostatic, transparent/opaque, resistance to broken, waterproof, airtight/ventilative, antiultraviolet, texts and pictures etc. can be printed, processing characteristics is comprised to the performance requirement of sizing agent, initial bonding strength, hold tack, peeling force, nontoxic, colourless etc., sizing agent is divided into hot melt adhesive by bonding principle, pressure sensitive adhesive, UV solidifies glue or its combination etc.
After use sizing agent realizes the adhesion of sealing membrane and sealing membrane or sealing membrane and glass, metal, plastics, paper etc., when carrying out the stripping of sealing membrane, do not destroying under the prerequisite by bur, common comprises following three kinds of stripping modes:
(1) delamination: make again layering lose efficacy, refers to when tearing sealing membrane, the sealing ply of film and other composite bed generation layerings and be peeling, and sealing ply is stayed by bur.Under this kind is peeled off, the sealing ply of sealing membrane and the compound fastness of composite bed be adjacent be less than sealing ply with by the sealing intensity of bur, so there is the layering of sealing ply and composite bed when peeling off, and sealing ply is thinner, be easy to break to form layering, and peeling force size is wayward, when opening sealing membrane, easily there is the phenomenon such as wire drawing, band burr.
(2) interface peel: be interfacial failure again, refers to that when tearing sealing membrane, the sealing ply of sealing membrane can strip down completely from by bur.Sealing membrane peel off after, sealing membrane and by bur do not have obvious color, the transparency change, clean, neat, attractive in appearance by the stripper surface of bur.This stripping mode is the stripping mode of the easy revealed secrets such as a lot of jelly, Yoghourt, puddings sealer at present, but the impact of condition is larger when the size of its peeling force is subject to sealing, heat-sealing window relative narrower, after standing autoclaving process, sealing membrane namely can Automatic-falling, stripping.
(3) poly-stripping in: be cohesion failure again, refer to when tearing sealing membrane, the sealing ply of sealing membrane first produces interfacial failure and inner stripping occurs, self is destroyed, a sealing ply part is stayed in sealing membrane main body, and another part has then been stayed by sticker surface, after sealing membrane is peeled off, peel off vestige clear in white, stripping strength is usually lower.
And bonded joint destroyed bearing external force time, be divided into and stick destruction (glue-line destroys with on the interface of adherend), cohesive failure (glue layer destroys), mix and destroy (stick destroy and cohesive failure has), adherend autoclasia (force of cohesion of adherend is less than the force of cohesion of bonding strength and glue-line) etc.
Summary of the invention
A kind of sealing membrane that the present invention provides to solve the problem, described sealing membrane comprises: the first sheet material and the second sheet material, described first sheet material comprises the first substrate layer and the first peel ply successively, described second sheet material comprises the second substrate layer and the second peel ply successively, described first peel ply contacts with described second substrate layer, described first peel ply has the last the first tackiness agent and the first weak tackiness agent, described second peel ply has the second tackiness agent, the stripping strength of described the last the first tackiness agent is higher than the stripping strength of described second tackiness agent, the stripping strength of described first weak tackiness agent is lower than the stripping strength of described second tackiness agent.
Preferably, the position that described the last the first tackiness agent and described first weak tackiness agent have a common boundary is the first stripping rest position, and described second peel ply also has the first stripping and guides space, and it is corresponding that rest position is peeled off in the described first position and first of peeling off guiding space.
Preferably, described first sheet material comprises the first functional layer, the first substrate layer and the first peel ply successively, described second sheet material comprises the second substrate layer, the second peel ply and the second functional layer successively, described sealing membrane also comprises the 3rd sheet material, described 3rd sheet material comprises the 3rd functional layer, the 3rd substrate layer and the 3rd peel ply successively, and described second functional layer contacts with described 3rd functional layer.
Preferably, described second tackiness agent is divided into the last the second tackiness agent and the second weak tackiness agent, the stripping strength of described the last the second tackiness agent is higher than the stripping strength of described second weak tackiness agent, and the position that described the last the second tackiness agent and described second weak tackiness agent have a common boundary is the second stripping rest position
Described 3rd peel ply also has the second stripping and guides space, and it is corresponding that rest position is peeled off in the described second position and second of peeling off guiding space.
Preferably, the stripping strength of described the last the first tackiness agent and described the last the second tackiness agent is all higher than the stripping strength of described 3rd tackiness agent, the stripping strength of described 3rd bonding is higher than the stripping strength of described second weak tackiness agent, and the stripping strength of described second weak tackiness agent is higher than the stripping strength of described first weak tackiness agent.
Preferably, described 3rd sheet material also comprises middle layer, and described middle layer is between described 3rd substrate layer and described 3rd peel ply.
Preferably, described the last the first tackiness agent is positioned at the side of described sealing membrane, and described 2nd the last the second tackiness agent is positioned at the opposite side of described sealing membrane.
Preferably, described first substrate layer is provided with draws ear.
Preferably, described sizing agent combination comprises: UV solidifies glue, and composition and the weight percent of described UV solidification glue are as follows:
Performed polymer 40-70%; Reactive thinner 5-45%; Free radical photo-initiation 1-3%; Cation light initiator 1-3%; Auxiliary agent 1-3%; Organic solvent 0-25%.
The present invention also provides a kind of wrapped product, and described wrapped product uses above-mentioned arbitrary sealing membrane.
Beneficial effect of the present invention is: in stripping process, and all sheet materials all cover by bur, to reach the effect of protection bur, until peeled off.
Embodiment
Be described in further detail below in conjunction with the embodiment of Figure of description to the application.
[embodiment 1]
As Fig. 1 is sealed in the sealing membrane SM (SealingMembrane) by bur C (Container) in embodiment 1.Being wrapped product by bur C, can be pottery, rubber, glass, metal, plastics, paper, leather, cloth, woodwork etc.
Sealing membrane SM comprises the first sheet material 1 and the second sheet material 2, wherein the first sheet material 1 is made up of successively the first substrate layer 1-2 and the first peel ply 1-3, second sheet material 2 is made up of successively the second substrate layer 2-2 and the second peel ply 2-3, wherein the second peel ply 2-3 directly contacts with by bur C, and the first peel ply 1-3 directly contacts with the second substrate layer 2-2.
First peel ply 1-3 has the last the first tackiness agent 1-3-1, and the first weak tackiness agent 1-3-2.Second peel ply 2-3 has the second tackiness agent.The stripping strength of the last the first tackiness agent 1-3-1 is higher than the stripping strength of the second tackiness agent, and the stripping strength of the first weak tackiness agent 132 is lower than the stripping strength of the second tackiness agent.
When opening, first there is first stage stripping from the right part of the weak tackiness agent 1-3-2 of first the first peel ply 1-3, stripping stops after extending to the last the first tackiness agent 1-3-1, the intersection of the first weak tackiness agent 1-3-2 and the last the first tackiness agent 1-3-1 is the first stage peel off rest position, when user continues to pull ear 1-2-1, second peel ply 2-3 peels off from left part generation subordinate phase, and subordinate phase stripping extends to the periphery sealing membrane SM and is separated with by bur C, completes stripping.Wherein, stripping mode is the combination of delamination or interface peel or interior poly-stripping or aforesaid way.
[embodiment 2]
Figure 2 shows that embodiment 2 forms the structure of the heat transfer film of the second sheet material.As different from Example 1, the second sheet material comprises the second functional layer and the second peel ply, and the second peel ply has the second tackiness agent.Heat transfer film comprises adherent layer, carrier film, peel ply, pattern decoration layer and then glue-line successively.
In the present embodiment, then glue be UV solidify glue, its composition and weight percent as follows: performed polymer 40-70%; Reactive thinner 5-45%; Free radical photo-initiation 1-3%; Cation light initiator 1-3%; Auxiliary agent 1-3%; Organic solvent 0-25%.Preferably, performed polymer is one or more in epoxy resin, acrylic resin, acrylic modified epoxy resin, urethane resin; Preferably, reactive thinner is one or more in bifunctional acrylate's class monomer, trifunctional group acrylate's class monomer; Preferably, auxiliary agent is flow agent and defoamer; Preferably, free radical photo-initiation is for carrying Hydrogen radical initiator and cracking type radical initiator; Preferably, cation light initiator is salt compounded of iodine cationoid light trigger; Preferably, organic solvent is one or more in butanone, acetone, ethyl acetate.
Heat transfer film is transferred to stock (by bur) and goes up and transfer printing stripping occurs, remaining then glue-line and pattern decoration layer stick to by bur, this remainder forms the second sheet material, then glue-line wherein forms the second tackiness agent, pattern decoration layer, with printed patterns, forms the second functional layer; Then in use dry type compound, satisfactory first sheet material is compound on the second sheet material, forms the sealing membrane in the application.Concrete structure and the use-pattern of sealing membrane are not repeated.
The structure of the sealing membrane in this embodiment in transfer printing process and the application organically combines, and greatly can enhance productivity, reduce costs, and have the widely application space identical with hot transfer printing.
[embodiment 3]
As the sealing membrane SM that Fig. 3 is in embodiment 3, it is sealed in by bur C, and be hold the carrier band of electron device or the rigid container of other more volumes by bur C, sealing membrane SM can be opaque, anti-electrostatic, antiultraviolet sealing membrane.
Sealing membrane SM comprises the first sheet material 1, second sheet material 2 and the 3rd sheet material 3, wherein the first sheet material 1 is made up of successively the first functional layer 1-1, the first substrate layer 1-2 and the first peel ply 1-3, second sheet material 2 is made up of successively the second substrate layer 2-2, the second peel ply 2-3 and the second functional layer 2-1, and the 3rd sheet material 3 is made up of successively the 3rd functional layer 3-1, the 3rd substrate layer 3-2, middle layer 3-4 and the 3rd peel ply 3-3.This three peel ply 3-3 directly contacts with by bur C, and the first peel ply 1-3 directly contacts with the second substrate layer 2-2, and the second functional layer 2-1 directly contacts with the 3rd functional layer 3-1.What the first substrate layer 1-2 had a protrusion draws ear 1-2-1, by user's handling during for opening.
Three functional layers and middle layer comprise one or more functional or esthetics additives and combine.Suitable additive is optional from one or more following its mixtures or its composition: the metal of the longitude and latitude distribution of puncture or fabric fibre, UV absorption agent, dyestuff, pigment, tinting material, metallization and/or pseudo-metalized coated, lubricant, static inhibitor (positively charged ion, negatively charged ion and/or nonionic, as poly-(oxygen ethene) anhydrous sorbitol acid anhydride monoleate, carbon nanotube), antioxidant is (as phosphoric acid, three (2,4-di-tert-butyl-phenyl) ester), tensio-active agent, firmly help very agent, slip aids (such as hot slip aids or cold slip aids, it improves the ability that film slips over from surface at about room temperatures satisfactorily, such as micro-crystallization wax), gloss improvers, prodegradant, change the gas of film and/or the barrier coating (as polyvinylidene halogenide, as PVDC) of moisture permeability, antiblock additive (as Microcrystalline Wax, such as median size is about 0.1 μm to about 0.6 μm), viscosity-reducing additives is (as aerosil, silicon-dioxide, silicon rubber), microparticle material (as talcum powder), increase the additive (as silicon carbide) of COF, improve the rheology modifier of ink adhesion and/or printing, increase the additive (as hydrocarbon resin) of rigidity, increase the additive (as hardened resin) shunk.
Some or all of the additive enumerated above can be added to be coated with one or more layers upper surface or the lower surface in sealing membrane together as composition or form new layer separately.Or, can between film Formation period using aforementioned additive some or all separately or be added directly in sealing membrane in one or more layers (part such as initial polymer composition is added in substrate layer or peel ply).
In the present embodiment, the first functional layer 1-1 with printed patterns, the second functional layer 2-1 and the 3rd function 3-1 layer is all opaque and with anti static additive, middle layer 3-4 is antiultraviolet material.In other embodiments, described first functional layer, the second functional layer and the 3rd functional layer also can have false proof, nontoxic, high-low temperature resistant, resistance to boiling, anti-electrostatic, transparent, resistance to broken, waterproof, other functions such as airtight or ventilative.
The position that first peel ply 1-3 has the last the first tackiness agent 1-3-1 and the first weak tackiness agent 1-3-2, the last the first tackiness agent 1-3-1 and the first weak tackiness agent 1-3-2 boundary is the first stripping rest position; Second peel ply 2-3 has the last the second tackiness agent 2-3-1 and the second weak tackiness agent 2-3-2, namely the position that the second tackiness agent is divided into the last the second tackiness agent 2-3-1 and the second weak tackiness agent 2-3-2, the last the second tackiness agent 2-3-1 and the second weak tackiness agent 2-3-2 to have a common boundary is the second stripping rest position; 3rd peel ply 3-3 has the 3rd tackiness agent, similar with the second tackiness agent in embodiment 1, and the 3rd tackiness agent of the present embodiment also can solidify glue for UV.The last the first tackiness agent 1-3-1 is positioned at the side of sealing membrane, and the last the second tackiness agent 2-3-1 is positioned at the opposite side of sealing membrane.
Also there is in second peel ply 2-3 the first stripping and guide space 2-3-G; Also there is in 3rd peel ply 3-3 the second stripping and guide space 3-3-G.And first peels off that to guide the position and first of space 2-3-G to peel off rest position corresponding, it is corresponding that rest position is peeled off in the position and second of the second stripping guiding space 3-3-G.
In addition, the stripping strength of the last the first tackiness agent 1-3-1, the first weak tackiness agent 1-3-2, the last the second tackiness agent 2-3-1, the second weak tackiness agent 2-3-2 and the 3rd tackiness agent is closed and is: the last the first tackiness agent 1-3-1 >=weak tackiness agent 1-3-2 of the last the second tackiness agent 2-3-1 > the 3rd tackiness agent > second weak tackiness agent 2-3-2 > first.
When opening, user's handling draws ear 1-2-1 to start to peel off, first from the right side of the weak tackiness agent 1-3-2 of first the first peel ply 1-3, first stage stripping occurs, peel off after extending to the last the first tackiness agent 1-3-1 and stop, namely the first stage peels off and stops in the first stripping rest position; When user continues to pull ear 1-2-1, under the involving of the first sheet material 1, corresponding first the peeling off and guide space 2-3-G can continue guiding second peel ply 2-3 from this position, subordinate phase to occur and peel off of rest position is peeled off with first, subordinate phase is peeled off and is extended to the left and right, subordinate phase is peeled off the left side and is completed stripping prior to the right, stops when the right that subordinate phase is peeled off extends to the second stripping rest position; When user continues to pull ear 1-2-1, under the involving of the first sheet material 1 and the second sheet material 2, corresponding second the peeling off and guide space 3-3-G can continue guiding the 3rd peel ply 3-3 the phase III occurs from this position to peel off of rest position is peeled off with second, phase III stripping extends to the periphery sealing membrane SM and is separated with by bur C, completes stripping.Wherein, stripping mode is the combination of delamination or interface peel or interior poly-stripping or aforesaid way.
In stripping process, all sheet materials all cover by bur C, to reach the effect of protection bur C, until peeled off.As in the present embodiment, the second functional layer 2-1 and the 3rd functional layer 3-1 has antistatic performance, ensures that the electrostatic produced in stripping process can not be passed to by bur C, and then avoids and cause electric discharge damage, until peeled off to it.
Fig. 4 a-4d peels off with lower floor the sciagraph guiding lower floor's peel ply in space to illustrate with the shape with the upper strata peel ply peeling off rest position in the application, this lower floor peels off and guides space can be arranged in the second sheet material, also the correct position of the 3rd sheet material or other sheet materials can be arranged in, it guides lower floor's peel ply to start to peel off for realizing from rest position is peeled off on upper strata, S represents strong tackiness agent region, W represents weak tackiness agent region, G represents to peel off and guides region, space, and T represents and draws ear region.Sealing membrane can be the shapes such as hexagon, rectangle or circle.Peel off guide region, space can triangular in shape, zig-zag, heart or the shape such as circular.
The above embodiment, just preferred embodiments of the present invention, be not limit practical range of the present invention, therefore all equivalences done according to structure, feature and the principle described in the present patent application the scope of the claims change or modify, and all should be included in patent claim of the present invention.