CN210085364U - Four-layer structure screen protection film - Google Patents

Abstract

The utility model provides a four-layer structure screen protection film, which comprises a bottom layer release film, a single-side silica gel segmented composite release film, a single-side silica gel hardened practical film and a top layer protection film which are arranged from bottom to top in sequence; a plurality of breaking lines are arranged on the single-sided silica gel segmented composite release film along the length direction, and the single-sided silica gel segmented composite release film is divided into a plurality of blocks by the breaking lines; the lower surface of the single-sided silica gel segmented composite release film is fixedly provided with a low-viscosity silica gel layer, and the lower surface of the low-viscosity silica gel layer is attached to the upper surface of the release film at the bottom layer. The novel film sticking device has the technical effects that the novel film sticking device can repeatedly move on a screen in the film sticking adjustment process, large-area silica gel is prevented from being exposed outside after the whole release film is directly uncovered before the film sticking of the traditional film sticking process, and accordingly dust and cilium in air are prevented from being adsorbed.

Description

Four-layer structure screen protection film

Technical Field

The utility model relates to a screen protection film field especially relates to a four-layer structure screen protection film.

Background

The screen protection film is the most common screen protection paste on the market at present, in the protection film, the PET material protection film is used extensively, the characteristics of PET material protection film are that the texture is than harder, it is more resistant to scratch, and long-time the use can not be like the yellowing oil production that PVC material did yet, but general PET's protection film all relies on silica gel absorption, the price of PET material protection film is more expensive and more few than PVC, when a lot of foreign known brand cell-phones were dispatched from the factory, it is PET material protection paste just to dispose at random, adopt PET material protection paste to do work and pack more exquisite, there are the protection paste that many manufacturers ordered specially for the hot cell-phone model, need not tailor and can directly use.

On the screen protection film of selling on the market, there are two problems that are difficult to paste in the pad pasting process, and first is difficult to once accurate counterpoint, needs adjustment many times, and the adjustment position in-process, the face of gluing is hindered easily to the finger. Secondly, after the release film is uncovered, a large area of silica gel is exposed outside, so that dust and cilia in air are easily adsorbed, and the two factors are main reasons of film sticking failure.

In conclusion, the existing screen protection film is difficult to accurately align once when being pasted, needs to be adjusted for multiple times, repeatedly uncovers the alignment in the adjustment process, and the whole release film needs to be completely uncovered by the pasting film, so that a large area of silica gel is exposed outside, and dust and cilia in the air are easily adsorbed.

Accordingly, the prior art is yet to be improved and developed.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, provide a four-layer structure screen protection film, have and to rectify repeatedly at pad pasting adjustment in-process, avoid traditional pad pasting to reveal the silica gel that appears a large tracts of land behind the release film and expose outside to avoid the dust in the adsorption air and the technological effect of cilium.

The utility model provides a technical scheme that technical problem adopted as follows:

a four-layer structure screen protection film comprises a bottom layer release film, a single-sided silica gel segmented composite release film, a single-sided silica gel hardened practical film and a top layer protection film which are sequentially arranged from bottom to top;

a plurality of breaking lines are arranged on the single-sided silica gel segmented composite release film along the length direction, and the single-sided silica gel segmented composite release film is divided into a plurality of blocks by the breaking lines;

the lower surface of the single-sided silica gel segmented composite release film is fixedly provided with a low-viscosity silica gel layer, and the lower surface of the low-viscosity silica gel layer is attached to the upper surface of the release film at the bottom layer;

the lower fixed surface of the practical single-sided silica gel stiffened film is provided with a silica gel layer, and the lower surface of the silica gel layer is laminated with the single-sided silica gel sectional composite release film.

Furthermore, the dividing line is provided with one line, and the single-side silica gel sectional composite release film is divided into a first sectional composite release film and a second sectional composite release film by the dividing line.

Further, the bottom is provided with first hand from type membrane front end and tears the mark, first segmentation is compound to be close to from the type membrane the one end of dividing the broken string is provided with the second hand and tears the mark, second segmentation is separated compound type membrane and is close to the one end of dividing the broken string is provided with the third hand and tears the mark, the rear end of top layer protection film is provided with the fourth hand and tears the mark.

Further, the first hand tearing mark, the second hand tearing mark, the third hand tearing mark and the fourth hand tearing mark are located on the same side of the protective film.

Further, the middle parts of the tail ends of the bottom release film, the single-side silica gel segmented composite release film, the single-side silica gel hardening practical film and the top protective film are provided with key holes.

Further, an adhesive layer is arranged between the single-sided silica gel hardening practical film and the top layer protective film and used for bonding the upper surface of the single-sided silica gel hardening practical film and the lower surface of the top layer protective film.

Further, the bottom release film, the single-sided silica gel segmented release film, the single-sided silica gel hardened practical film and the top protective film are all made of PET transparent films.

Further, the thickness of the bottom layer release film is 0.05mm, the thickness of the single-sided silica gel segmented composite release film 20 is 0.135mm +/-0.05 mm, the thickness of the single-sided silica gel hardened practical film 30 is 0.24mm +/-0.05 mm, and the thickness of the top layer protective film 40 is 0.06mm +/-0.01 mm.

The beneficial effect who adopts above-mentioned scheme is: according to the scheme, the single-sided silica gel segmented composite release film is adopted, the whole release film below the segmented release film is uncovered by using a first hand tearing mark before film pasting, the whole low-viscosity silica gel is exposed, repeated alignment is carried out on a screen, and in the process of repeatedly correcting the position, the silica gel of the practical film hardened by the single-sided silica gel is prevented from being exposed outside, and dust and cilium in adsorbed air are avoided; the low-viscosity silica gel layer is convenient to repeatedly uncover and attach, the film pasting process is accurate, and the screen is cleaned for the second time through the low-viscosity silica gel layer on the single-sided silica gel sectional composite release film when the single-sided silica gel sectional composite release film is uncovered again. Because the middle of the single-sided silica gel segmented composite release film is provided with the breaking line, after the single-sided silica gel segmented composite release film is uncovered again, the composite release film below the use layer is uncovered by using a second tearing mark on the side surface and then put down again, the other half of the single-sided silica gel segmented composite release film is adsorbed on the surface of the screen, the half of the single-sided silica gel segmented composite release film is uncovered again, the position of the protective film which is put down again cannot move, and the silica gel layer is adsorbed on the surface of the screen. After the machine is turned around, the other half of the single-sided silica gel is torn off by a third hand to be covered off, the release film is combined in a segmented mode, then the protective film is put down again, the single-sided silica gel is hardened, the practical film and the silica gel layer are adsorbed on the screen, and the time for exposing the silica gel layer in the air is short and the area is small in the whole process. Greatly improving the success rate of film pasting.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a four-layer screen protection film of the present invention.

Fig. 2 is the utility model discloses a single face silica gel segmentation of four-layer structure screen protection film is compound from type membrane and low viscidity silica gel layer structure sketch map.

Fig. 3 is a schematic structural diagram of a single-sided silica gel hardened practical membrane and a silica gel layer of the four-layer structure screen protection film of the present invention.

Fig. 4 is a schematic view of a first web of material.

Fig. 5 is a schematic view of a second roll of material.

Fig. 6 is a schematic view of a third roll of material.

Fig. 7 is a flowchart of an embodiment of a manufacturing process of a four-layer structure screen protection film of the present embodiment.

FIG. 8 is a flow chart of a preferred embodiment of the manufacturing process of the four-layer structure screen protection film of the present invention.

In the figure: 10. a bottom release film; 20. single-side silica gel sectional composite release film; 21. a first sectional composite release film; 22. a second sectional composite release film; 23. splitting the wire; 30. hardening the practical film by single-sided silica gel; 40. a top protective film; 51. a first hand tear tab; 52. a second tear tab; 53. a third hand-tear label; 54. a fourth hand tear tab; 60. a key hole; 70. a low viscosity silicone gel layer; 80. a silica gel layer; 91. a first PET protective film; 92. a first release film; 93. a second upper release film; 94. a second release film; 96. a PE textured film; 97. and a third lower release film.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, a four-layer structure screen protection film includes a bottom release film 10, a single-sided silica gel segmented composite release film 20, a single-sided silica gel hardened practical film 30, and a top protection film 40, which are sequentially arranged from bottom to top, in order to improve product quality, the bottom release film 10, the single-sided silica gel segmented composite release film 20, the single-sided silica gel hardened practical film 30, and the top protection film 40 in this embodiment all adopt PET transparent films, wherein the thickness of the bottom release film 10 is 0.05mm, and the bottom release film 10 with the thickness has certain structural strength to protect other release films inside the protection film; the thickness of the single-sided silica gel segmented composite release film 20 is 0.135mm +/-0.05 mm, and the single-sided silica gel segmented composite release film 20 with the thickness has toughness when being pasted and is convenient for alignment in the film pasting process; the thickness of the practical single-sided silica gel hardened film 30 is 0.24mm +/-0.05 mm, the practical single-sided silica gel hardened film 30 is used for being pasted on the surface of a screen to protect the screen, and the practical single-sided silica gel hardened film 30 with the thickness has the advantages of being hard in texture, scratch resistant and high in permeability; the thickness of top protection film 40 is 0.06mm 0.01mm, and the top protection film 40 of this thickness adopts the protective performance of whole protection film's structure high, prevents that the dust from getting into whole protection film structure. Certainly, the single-sided silica gel hardened practical film 30 can also be made of a common PVC transparent film or other soft materials, and the bottom release film 10, the single-sided silica gel segmented composite release film 20, and the top protective film 40 can be made of other soft materials or transparent materials.

As shown in fig. 1 and 2, the lower surface of the single-sided silica gel segmented composite release film 20 is fixedly coated with a low-viscosity silica gel layer 70, the lower surface of the low-viscosity silica gel layer 70 is attached to the upper surface of the bottom release film 10, and in the film attaching process, the single-sided silica gel segmented composite release film 20 and the low-viscosity silica gel layer 70 are used as a whole. As shown in fig. 1 and fig. 3, the lower surface of the single-sided silica gel hardened practical film 30 is coated with a silica gel layer 80, the silica gel layer 80 is a transparent layer, the lower surface of the silica gel layer 80 is attached to the single-sided silica gel segmented composite release film 20, and the single-sided silica gel hardened practical film 30 and the silica gel layer 80 are used as a whole in the film attaching process. Be provided with the bond line (not marked in the figure) between practical film 30 and the top layer protection film 40 of single face silica gel stiffened, the bond line is used for bonding practical film 30 upper surface and top layer protection film 40 lower surface of single face silica gel stiffened, at the pad pasting in-process, the bond line uses as a whole with top layer protection film 40, and the bond line makes top layer protection film 40 fix on practical film 30 upper surface of single face silica gel stiffened, generally adopts the viscous material that easily removes, makes things convenient for the silica gel layer 80 under practical film 30 of single face silica gel stiffened to adsorb and uncover top layer protection film 40 on practical film 30 of single face silica gel stiffened behind the screen.

As shown in fig. 1, a plurality of dividing lines 23 are arranged on the single-sided silicone segmented composite release film 20 along the length direction, the dividing lines 23 divide the single-sided silicone segmented composite release film 20 into a plurality of pieces, in this embodiment, one dividing line 23 is arranged, and one dividing line 23 divides the single-sided silicone segmented composite release film 20 into a first segmented composite release film 21 and a second segmented composite release film 21

A release film 22.

Firstly, placing equipment needing film pasting, wiping a screen of the equipment, wiping the equipment cleanly to check whether dust and particles exist, then uncovering a bottom release film 10, aligning low-viscosity silica gel at the bottom of a single-sided silica gel segmented composite release film 20 on the screen after uncovering, repeatedly aligning the screen due to the adoption of the low-viscosity silica gel, uncovering a first segmented composite release film 21 at one side of a dividing line 23, uncovering a second segmented composite release film 22 after the single-sided silica gel segmented composite release film 21 is uncovered outwards due to the dividing line 23, automatically adsorbing a silica gel layer 80 at the bottom of the single-sided silica gel hardened practical film 30 of the newly-placed protective film on the surface of the screen, turning a machine, uncovering the second segmented composite release film 22, uncovering the segmented composite release film 22 outwards, and putting down the protective film again, the whole single-sided silica gel hardened practical film 30 can be adsorbed on the screen through the silica gel layer 80, the single-sided silica gel hardened practical film 30 serves as a using layer of the protective film, the screen is protected after being pasted on the screen, and then the top protective film 40 is taken off to complete film pasting. Similarly, for the plurality of breaking lines 23, a plurality of sections of the sectional composite release films can be sequentially uncovered, so that the film pasting is completed.

Therefore, in the embodiment, the single-sided silica gel segmented composite release film 20 is adopted, so that the single-sided silica gel hardened practical film 30 can be segmented and attached to the screen, and in the process of repeatedly correcting the position, only the silica gel layer 80 of the segmented and attached part needs to be exposed, so that large-area silica gel is prevented from being exposed, and dust and cilia in the air are prevented from being adsorbed; the position can be repeatedly corrected before the single-sided silica gel hardened practical film 30 is pasted on the screen, so that the pasting process is more accurate, the low-viscosity silica gel layer 80 is convenient to repeatedly uncover and paste, and in the process of repeatedly correcting the position, the screen is cleaned for the second time through the low-viscosity silica gel layer 80 on the single-sided silica gel sectional composite release film 20 when the single-sided silica gel sectional composite release film is uncovered again.

The bottom is provided with first hand from type membrane 10 front end and tears mark 51, first segmentation is compound to be close to from type membrane 21 the one end of dividing broken string 23 is provided with the second hand and tears mark 52, second segmentation is compound to be close to from type membrane 22 the one end of dividing broken string 23 is provided with the third hand and tears mark 53, the rear end of top layer protection film 40 is provided with the fourth hand and tears mark 54. The hand in this implementation tears mark and the integrative cross cutting shaping of membrane structure who corresponds, makes the bottom take off type membrane 10 and tear mark 51 through first hand and open, and first segmentation is compound to be taken off type membrane 21 through second hand and tear mark 52 and open, and second segmentation is compound to be taken off type membrane 22 and tears mark 53 through the third hand and open, and top layer protection film 40 tears mark 54 through the fourth hand and open, and the convenience is uncovered when the pad pasting, and the convenience is strong. First hand tears mark 51, second hand and tears mark 52, third hand and tears mark 53 and fourth hand and tears mark 54 and lie in the same one side of protection film, and the homonymy sets up the hand and tears the mark, makes to take off the membrane in-process and take off the membrane in same direction, makes things convenient for the pad pasting process also to make whole protection film structure coordinate, more makes things convenient for the production and processing of protection film, and the position that the hand torn the mark is not limited to the position of this embodiment, also can tear the mark position according to the screen adjustment hand of different models.

The bottom is provided with the key hole 60 from the terminal middle part of type membrane 10, single face silica gel segmentation complex from type membrane 20, single face silica gel stiffened practical membrane 30, top layer protection film 40, avoids disturbing the equipment button. The position of the key hole 60 may be set according to different models, or may not be set, and the clearance hole, such as a sound hole, a light sensing hole, a camera hole, etc., may be set according to different requirements, not only limited to this embodiment.

As shown in fig. 7, the present embodiment further provides a manufacturing process of a four-layer screen protection film, which includes the following steps:

and S100, printing required contents on the first release film.

The specific process is that some identification patterns or text contents are made on the protective film according to the needs, and the needed contents and patterns are printed on the first release film through a printer.

As shown in fig. 8, in a preferred embodiment, step S100 specifically includes:

step S110, a first roll material is prepared in advance, and the first roll material includes a first release film located at a lower portion and a first PET protection film attached to the first release film.

And step S120, printing the required content on the first release film through a printer.

The method specifically comprises the following steps: preparing materials, namely preparing a first coiled material in advance, wherein the first coiled material comprises a first PET protective film 91 with the thickness of 60 micrometers and a first release film 92 with the thickness of 75 micrometers, as shown in FIG. 4, the first PET protective film 91 is of a film structure, and the bottom of the first PET protective film 91 is attached to the first release film 92; the first coiled material can be directly unreeled, and is favorable for batch production. And printing the first release film on the back of the first roll material by a printer to obtain the required contents and patterns.

S200, obtaining a second release film with the upper surface coated with acrylic adhesive, a bottom release film positioned on the lower surface of the second release film, and a PE mesh film compounded on the lower surface of the bottom release film.

The method specifically comprises the following steps: preparing materials, namely preparing a second release film with one side coated with acrylic adhesive in advance, coating low-viscosity silica gel on the other side of the second release film, arranging a bottom release film on the lower surface of the second release film, and attaching a reticulate PE film on the bottom release film.

As shown in fig. 8, in a preferred embodiment, step S200 specifically includes:

step S210, preparing a second roll material in advance, wherein the second roll material comprises a second upper release film, a second release film, a bottom release film and a PE (polyethylene) mesh film, the second upper release film, the second release film, the bottom release film and the PE mesh film are sequentially arranged from top to bottom, the upper surface of the second release film is coated with acrylic adhesive, and the lower surface of the second release film is fixed with low-viscosity silica gel.

Step S220, the upper release film is uncovered, and the acrylic adhesive layer of the second release film coated with acrylic adhesive is exposed.

The method specifically comprises the following steps: as shown in fig. 5, the second layer of roll material includes an upper release film 93 with a thickness of 50 μm, a second release film 94 with a thickness of 70 μm, one side coated with acrylic glue and one side fixed with low-viscosity silicone glue, a bottom release film 10, and a PE anilox film 96. The upper release film 93 and the second release film 94 are both made of PET material; the second that upper strata from type membrane 93 is surface course, one side coating acrylic glue and one side fixed low viscidity silica gel is two layers from type membrane 94, the bottom is the third layer from type membrane 10, and the bottom is from the PET that the thickness of type membrane 10 is 50 mu m from type membrane, PE net grain membrane 96 is located the fourth layer and thickness is 60 mu m, and the four layers laminating forms the coil stock. The second roll material can be directly unreeled, and is beneficial to batch production. And (3) uncovering the upper release film 93 at the top of the second roll material, so that the acrylic adhesive surface of the uncovered second release film 94 is exposed.

And step S300, attaching the exposed surface of the second release film coated with the acrylic adhesive to the printed surface of the first release film to form an attaching material.

And S400, die cutting is carried out on the laminating material, the first release film and the second release film are broken down, and the bottom layer is not broken down, the lower surface of the release film is compounded, and the PE mesh film is not broken down.

And S500, cutting out a dividing line from the first release film and the second release film and obtaining the single-sided silica gel sectional composite release film.

The method specifically comprises the following steps: and (3) attaching the exposed surface of the acrylic glue coated on the second release film to the printing surface of the first release film of the first roll-shaped material, and then rolling. Then the rolled bonding material is put into an automatic die cutting machine, and the structure of the bonding material at the moment is that a first PET protective film is arranged from top to bottom

The single-sided silica gel segmented composite release film comprises a first release film, a second release film tightly attached to the first release film, a bottom release film and a PE (polyethylene) net grain film, wherein the first release film and the second release film tightly attached to the first release film form the single-sided silica gel segmented composite release film; and then carrying out full-automatic position-following die cutting on the laminated material, and puncturing the first protective film, the first release film and the second release film in the laminated material, but not puncturing the bottom release film and the PE mesh film. And cutting a dividing line by the first die cutting seat to realize the segmentation of the single-side silica gel segmented composite release film.

Then, a single-sided silica gel segmented composite release film needs to be obtained, and the specific process is as follows: the laminating material automatically enters a double-seat laminating machine between two die cutting machines, a first PET protective film on the outermost surface of the material is automatically uncovered at a first station in the double-seat automatic laminating machine, and the laminating material at the moment is a single-side silica gel segmented composite release film, a bottom release film and a PE (polyethylene) mesh film.

And S600, acquiring the single-sided silica gel hardening practical film with the exposed silica gel surface and a top layer protective film positioned on the upper surface of the single-sided silica gel hardening practical film.

The method specifically comprises the following steps: preparing materials, namely preparing a single-sided silica gel hardening practical film and a top layer protective film positioned on the upper surface of the single-sided silica gel hardening practical film in advance, wherein the silica gel surface of the single-sided silica gel hardening practical film is exposed.

As shown in fig. 8, in a preferred embodiment, step S600 specifically includes:

step S610, preparing a third roll material in advance, wherein the third roll material comprises a top layer protective film, a single-face silica gel hardening practical film and a third lower layer release film which are sequentially arranged from top to bottom.

And S620, uncovering a third lower release film of the third rolling material to obtain a single-side silica gel hardening practical film and expose a silica gel surface.

The method specifically comprises the following steps: as shown in fig. 6, the third roll material comprises a top protective film 40 with an acrylic adhesive layer and a thickness of 60 μm, a single-sided practical film 30 adhered to the lower surface of the acrylic adhesive layer and exposing the silicone surface, and a third lower release film 97 with a thickness of 50 μm on the lower surface of the silicone surface, which are arranged in sequence from top to bottom; the single-sided silicone stiffened utility film 30 is laminated through the top protective film 40 of the acrylic adhesive layer. And a second station in the double-seat automatic laminating machine uncovers a third lower layer of the bottom of the third rolling material from the release 97 film to obtain the single-face silica gel hardening practical film 30 with the exposed silica gel surface.

Step S700, attaching the silicon rubber surface of the single-sided silicon rubber hardened practical film to the first release film.

The method specifically comprises the following steps: after the single-sided silica gel hardened practical film with the exposed silica gel surface is obtained, the silica gel surface is attached to the first release film, namely, the single-sided silica gel hardened practical film is attached to the single-sided silica gel sectional composite release film. And the film is peeled off and attached at the same time in the processing process, so that synchronous production is realized. The structure of the material prepared at this time is as follows: the top protection film, the practical membrane of single face silica gel stiffened of taking the silica gel face, first from the type membrane and the laminating of second from the type membrane formed single face silica gel segmentation composite from the type membrane, the bottom is from the type membrane to and reticulation PE membrane.

And S800, cutting the film into a required size shape and a required hand-tearing label shape in a die cutting machine, wherein the PE mesh film at the bottom layer is not broken down in the die cutting process.

The method specifically comprises the following steps: entering a die cutting machine behind the laminating machine, and then cutting into slices in the die cutting machine to form the required shape and the shape of the hand tearing label.

In the process, the single-sided silica gel hardening practical film is attached to the cut single-sided silica gel sectional composite release film by replacing the first PET protective film, and then the appearance and the hand tearing mark of the die-cut product are cut. Effectively avoiding the cut single-sided silica gel from being separated from the opening of the composite membrane in sections and damaging the base material of the single-sided silica gel hardened practical membrane.

And step S900, stripping a sheet-shaped finished product from the PE mesh film.

The method specifically comprises the following steps: finally, the PE mesh film is stripped to form a sheet-shaped finished product, the finished product is divided into four layers, each layer is provided with a hand tearing mark, the lowest layer is a bottom release film 10, the single-face silica gel segmented composite release film 20 arranged on the upper surface of the bottom release film 10 is arranged on the bottom, the single-face silica gel hardened practical film 30 arranged on the upper surface of the single-face silica gel segmented composite release film 20 is arranged on the upper surface of the single-face silica gel hardened practical film 40.

To sum up, the four-layer structure screen protection film provided by the scheme of the utility model can be jointed with the screen in a segmented and combined way by adopting the single-sided silica gel segmented and combined release film, and after the position of the whole low-viscosity silica gel combined release film is repeatedly corrected, the silica gel part of the single-sided silica gel hardened and combined practical film of the segmented and combined part is only required to be exposed outside, thereby avoiding the large-area silica gel of the silica gel layer from being exposed outside and avoiding adsorbing dust and cilium in the air; the position can be repeatedly corrected before the single-sided silica gel hardened practical film is pasted on the screen, so that the film pasting process is more accurate, the low-viscosity silica gel layer is convenient to repeatedly uncover and paste, and in the process of repeatedly correcting the position, the screen is cleaned for the second time through the low-viscosity silica gel layer on the single-sided silica gel sectional composite release film when the single-sided silica gel sectional composite release film is uncovered again. The label is convenient to tear when the film is pasted by adopting the hand tearing label, and the convenience is strong. In the production method, the first PET protective film is replaced in the production process, so that the single-sided silica gel hardened practical film is attached to the cut single-sided silica gel segmented composite release film, the appearance of the product and the hand tearing mark are die-cut, and the phenomenon that the cut single-sided silica gel segmented composite release film is damaged by an opening of the cut single-sided silica gel segmented composite release film and a base material of the single-sided silica gel hardened practical film is effectively avoided.

It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims (8)

1. A four-layer structure screen protection film is characterized by comprising a bottom layer release film, a single-sided silica gel segmented composite release film, a single-sided silica gel hardening practical film and a top layer protection film which are sequentially arranged from bottom to top;

a plurality of breaking lines are arranged on the single-sided silica gel segmented composite release film along the length direction, and the single-sided silica gel segmented composite release film is divided into a plurality of blocks by the breaking lines;

the lower surface of the single-sided silica gel segmented composite release film is fixedly provided with a low-viscosity silica gel layer, and the lower surface of the low-viscosity silica gel layer is attached to the upper surface of the release film at the bottom layer;

the lower fixed surface of the practical single-sided silica gel stiffened film is provided with a silica gel layer, and the lower surface of the silica gel layer is laminated with the single-sided silica gel sectional composite release film.

2. The four-layer structure screen protective film according to claim 1, wherein: the dividing line is provided with one line, and the single-side silica gel sectional composite release film is divided into a first sectional composite release film and a second sectional composite release film by the dividing line.

3. The four-layer structure screen protective film according to claim 2, characterized in that: the bottom is provided with first hand from type membrane front end and tears the mark, first segmentation is compound to be close to from the type membrane the one end of dividing the broken string is provided with the second hand and tears the mark, second segmentation is compound to be close to from the type membrane the other end of dividing the broken string is provided with the third hand and tears the mark, the rear end of top layer protection film is provided with the fourth hand and tears the mark.

4. The four-layer structure screen protective film according to claim 3, wherein: the first hand tearing mark, the second hand tearing mark, the third hand tearing mark and the fourth hand tearing mark are positioned on the same side of the protective film.

5. The four-layer structure screen protective film according to any one of claims 1 to 4, wherein: the bottom layer is from type membrane, single face silica gel segmentation complex from type membrane, single face silica gel stiffened practical membrane and top layer protection film's terminal middle part all is provided with the key hole.

6. The four-layer structure screen protective film according to claim 1, wherein: a bonding layer is arranged between the single-sided silica gel hardening practical film and the top layer protective film and used for bonding the upper surface of the single-sided silica gel hardening practical film and the lower surface of the top layer protective film.

7. The four-layer structure screen protective film according to claim 1, wherein: the bottom layer release film, the single-side silica gel segmented composite release film, the single-side silica gel hardened practical film and the top layer protective film are all made of PET transparent films.

8. The four-layer structure screen protective film according to claim 7, wherein: the bottom is 0.05mm from the thickness of type membrane, the single face silica gel segmentation is compound is 0.135mm 0.05mm from the thickness of type membrane, and the thickness of single face silica gel stiffened practical membrane is 0.24mm 0.05mm, the thickness of top layer protection film is 0.06mm 0.01 mm.

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