CN111193819A - Mobile phone protective sleeve and production process thereof - Google Patents

Mobile phone protective sleeve and production process thereof Download PDF

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Publication number
CN111193819A
CN111193819A CN201911369248.4A CN201911369248A CN111193819A CN 111193819 A CN111193819 A CN 111193819A CN 201911369248 A CN201911369248 A CN 201911369248A CN 111193819 A CN111193819 A CN 111193819A
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CN
China
Prior art keywords
layer
resin
coating
mobile phone
protective sleeve
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Pending
Application number
CN201911369248.4A
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Chinese (zh)
Inventor
许文虓
吴雄仰
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Dongguan Zhidongli Electronic Technology Co ltd
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Dongguan Zhidongli Electronic Technology Co ltd
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Priority to CN201911369248.4A priority Critical patent/CN111193819A/en
Publication of CN111193819A publication Critical patent/CN111193819A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0279—Improving the user comfort or ergonomics
    • H04M1/0283—Improving the user comfort or ergonomics for providing a decorative aspect, e.g. customization of casings, exchangeable faceplate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/14—Printing or colouring
    • B32B38/145—Printing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
    • H04M1/185—Improving the rigidity of the casing or resistance to shocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/28—Multiple coating on one surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/56—Damping, energy absorption
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Laminated Bodies (AREA)
  • Holo Graphy (AREA)

Abstract

The invention relates to a mobile phone protective sleeve, which comprises a protective sleeve back plate part and a protective sleeve side wall part which are connected into a whole, wherein a back plate main body which has the same material, pattern and performance as a mobile phone rear cover is arranged in the protective sleeve back plate part, the back plate main body comprises a transparent substrate, a surface hardening layer and a tackifying functional resin coating are sequentially coated on the outer side surface of the transparent substrate, and a printing ink layer, a laser holographic image texture layer, an optical coating layer and a heat-resistant and high-temperature-resistant functional resin bottom coating are sequentially attached to the inner side surface of the transparent substrate. The mobile phone protective sleeve forms various functional layers by coating or attaching ink materials and various resin materials on the surfaces of the two sides of the substrate, and forms a laser holographic image texture layer by adopting a laser holographic image texture manufacturing technology, so that the mobile phone protective sleeve product has an anti-counterfeiting function; meanwhile, the performance standard of the mobile phone rear shell can be achieved, and compared with the performance standard of a common mobile phone protective sleeve, the performance standard of the mobile phone protective sleeve is improved by multiple times.

Description

Mobile phone protective sleeve and production process thereof
The technical field is as follows:
the invention relates to the technical field of mobile phone peripheral products, in particular to a mobile phone protective sleeve and a production process thereof.
Background art:
the mobile phone has many powerful functions and is super portable, so that the mobile phone becomes an indispensable electronic product in daily life, various mobile phones on the market are full of eyes, the price is low, hundreds of thousands of mobile phones are high, and the distribution and the structure of internal elements of the mobile phone are more and more precise, which is particularly important for shock-proof protection of the mobile phone, so that people are usually equipped with a mobile phone protective sleeve to protect the mobile phone.
The existing mobile phone protective sleeves are generally integrally formed by plastic or resin materials, and some mobile phone protective sleeves are attached with special patterns on the outer surfaces to show individuality, so that different consumers are satisfied. The mobile phone protective sleeve has a simple structure, but low standard, disordered market and uneven quality, and consumers can easily buy the mobile phone protective sleeve with poor performance, so that the mobile phone protective sleeve has limited protection to the mobile phone and brings loss to the consumers; moreover, the protective sleeve shields the original mobile phone rear shell, so that the appearance design of the mobile phone is difficult to show, the decorative effect is poor, and the anti-counterfeiting function is not provided.
The invention content is as follows:
the invention aims to overcome the defects of the existing product and provides a mobile phone protective sleeve and a production process thereof.
The technical scheme adopted by the invention is as follows: the utility model provides a cell-phone protective sheath, its protective sheath back plate portion and protective sheath side wall portion as an organic whole including connecting, wherein: the inside backplate main part that has of protective sheath backplate portion, the backplate main part includes a transparent substrate, and the coating has the surface hardening layer in proper order, increases viscous function resin coating in the outside surface of transparent substrate, and the inboard surface of transparent substrate has printing ink layer, laser holographic image texture layer, optical coating layer, hinders hot high temperature resistant function resin under coat in proper order, and has the hot melt resin layer of this backplate main part of complete cladding through injection moulding in the periphery of backplate main part in, and the hot melt resin layer extends the shaping along backplate main part edge side surface direction inwards protective sheath side wall portion.
In the mobile phone protective sleeve, the transparent substrate is a printable PMMA/PC composite board or other high polymer resin boards.
In the mobile phone protective sleeve, the surface hardening layer is UV hardening resin with the thickness less than or equal to 8 mu m and the hardness less than or equal to 6H.
In the mobile phone protective sleeve, the tackifying functional resin coating is one or more coating layers formed by one or more of acrylic acid, polyurethane or waterborne polyester resin, and the thickness of the coating layer is less than or equal to 20 mu m.
In the mobile phone protective sleeve, the printing ink layer is formed by silk-screen printing, offset printing, digital printing or gravure printing, the thickness of the ink layer is less than or equal to 100 mu m, and the ink type is one or more of functional ink, transparent and covering color ink, laser ink, various anti-counterfeiting inks and functional decorative ink.
In the mobile phone protective sleeve, the laser holographic image texture layer is made of UV resin, and is irradiated and cured by an ultraviolet light source, and then the resin material is transferred by a transfer printing process to form the laser holographic image texture layer, wherein the thickness of the laser holographic image texture layer is less than or equal to 2.6 microns, and the depth of the laser holographic image texture (grating) is less than or equal to 1 micron.
In the mobile phone protective sleeve, the optical coating layer is transparent and reflective, and the thickness of the optical coating layer is in the hundred angstrom level;
in the protective sleeve for the mobile phone, the heat-insulating and temperature-resistant functional resin coating (the bottom coating) is a coating layer of acrylic acid, polyurethane or waterborne polyester resin with a thickness of less than or equal to 30 mu m and a dry coating weight of 0.05-3g/m2。
In the mobile phone protective sleeve, the IMD resin layer is a hot melt adhesive resin with one or a mixture of TPU, ABS, PP and PE as main components, and the injection molding temperature is 200-280 ℃.
The invention also provides a production method of the mobile phone protective sleeve, which comprises the following steps:
coating one or more printing inks on the inner side surface of the transparent substrate to form a printing ink layer;
transferring a resin material on the outer surface of the printing ink layer through a transfer printing process to form a laser holographic image texture layer;
step three, attaching a transparent brightening optical coating on the surface of the texture layer of the laser holographic image prepared in the step two to form an optical coating layer;
coating heat-resistant high-temperature-resistant resin on the surface of the optical coating layer to form a heat-resistant high-temperature-resistant resin bottom coating;
coating UV resin on the outer side surface of the transparent substrate to form a surface hardening layer;
step six, coating tackifying functional resin on the outer surface of the surface hardening layer to form a tackifying functional resin layer;
after the steps (I) to (VI), a backboard main body which is sequentially attached with a printing ink layer, a laser holographic image texture layer, an optical coating layer, a heat-resistant high-temperature-resistant functional resin bottom coating layer and a surface hardening layer and a tackifying functional resin coating layer is sequentially coated on the outer side surface is formed on the inner side surface of the transparent substrate;
and step seven, carrying out an IMD process on the backboard main body, namely putting the backboard main body into a mould to carry out in-mould injection molding on the protective sleeve, wherein the backboard main body is coated by hot melt resin to form a protective sleeve backboard part, and the hot melt resin extends towards the inner side surface along the edge of the backboard main body to form a protective sleeve side wall part.
In the production method, after the step (four) is completed and before the step (five) is completed, high-pressure forming is carried out to enable the edge of the composite board to be slightly bent to be matched with the rear shell of the mobile phone, and then the finishing engraving process is carried out to carry out trimming treatment and accurate size.
The mobile phone protective sleeve takes acrylic plates or plates made of similar materials as a substrate, various functional layers are formed by coating or attaching ink materials and various resin materials on the surfaces of the two sides of the substrate, and a laser holographic image texture layer is formed by adopting a laser holographic image texture manufacturing technology, so that the mobile phone protective sleeve product has an anti-counterfeiting function, and the attractive decorative effect of the mobile phone protective sleeve product is incomparable to that of a common mobile phone protective sleeve; meanwhile, the anti-falling and anti-seismic performance of the mobile phone protective sleeve is further improved, the performance standard of the mobile phone rear shell can be achieved, and compared with the performance standard of a common mobile phone protective sleeve, the performance standard of the mobile phone protective sleeve is improved by multiple times.
Description of the drawings:
FIG. 1 is a schematic overall cross-sectional view of a protective cover for a mobile phone in accordance with the present invention;
fig. 2 is a schematic view of a partial hierarchy of the protective cover for a mobile phone according to the present invention.
The specific implementation mode is as follows:
the invention is further illustrated below with reference to specific embodiments and the accompanying drawings.
As shown in fig. 1 and fig. 2, the invention relates to a mobile phone protective case, which comprises a protective case back plate part 1 and a protective case side wall part 2 which are connected into a whole, wherein: inside backplate main part 3 that has of protective sheath backplate portion 1, backplate main part 3 includes a transparent substrate 31, it has hardened surface layer 32, tackifying function resin coating 33 to coat in proper order in the outside surface of transparent substrate 31, in the inboard surface of transparent substrate 31 in proper order with printing ink layer 34, laser holographic image texture layer 35, optical coating layer 36, hinder high temperature resistant function resin under coat 37, and have the hot melt resin layer 38 of this backplate main part 3 of cladding through injection moulding in the mould in the periphery of backplate main part 3, and hot melt resin layer 38 along backplate main part 3 edge towards its inside surface direction extension shaping protective sheath side wall portion 2.
In the mobile phone protective case, the transparent substrate 31 is a printable PMMA/PC composite board or other polymer resin board.
In the mobile phone protective sleeve, the surface hardening layer 32 is UV hardening resin with the thickness less than or equal to 8 μm and the hardness less than or equal to 6H.
In the mobile phone protective sleeve, the tackifying functional resin coating 33 is one or more coating layers formed by one or more of acrylic acid, polyurethane or waterborne polyester resin, and the thickness of the coating layer is less than or equal to 20 μm.
In the mobile phone protective sleeve, the printing ink layer 34 is formed by silk-screen printing, offset printing, digital printing or gravure printing, the thickness of the ink layer is less than or equal to 100 μm, and the type of the ink is one or more of functional ink, transparent and covering color ink, laser ink, various types of anti-counterfeiting ink and functional decorative ink.
In the mobile phone protective sleeve, the laser holographic image texture layer 35 is made of UV resin, after the UV resin is irradiated and cured by an ultraviolet light source, the resin material is transferred and printed by a transfer printing process to form the laser holographic image texture layer, the thickness of the laser holographic image texture layer 35 is less than or equal to 2.6 microns, and the depth of the laser holographic image texture (grating) is less than or equal to 1 micron. The transfer process may be C2A process or a water transfer process or other known transfer processes.
In the mobile phone protective sleeve, the optical coating layer 36 is a transparent optical coating and a reflective optical coating, and the thickness of the optical coating layer is in the hundred angstrom level;
in the protective sleeve for mobile phone, the heat-insulating and temperature-resistant functional resin coating 37 (bottom coating) is a multi-layer coating layer of acrylic acid, polyurethane or waterborne polyester resin, the thickness is less than or equal to 30 mu m, and the dry coating weight is 0.05-3g/m2。
In the mobile phone protective sleeve, the resin layer for IMD in-mold injection molding is a hot melt adhesive resin with one or a mixture of TPU, ABS, PP and PE as a main component, and the injection molding temperature is 200-280 ℃.
The invention also provides a production method of the mobile phone protective sleeve, which comprises the following steps:
coating one or more printing inks on the inner surface of the transparent substrate 31 to form a printing ink layer 34;
transferring a resin material on the outer surface of the printing ink layer 34 by a transfer process to form a laser holographic image texture layer 35;
step three, adhering a transparent brightening optical coating on the surface of the laser holographic image texture layer 36 prepared in the step two to form an optical coating layer 35;
step four, coating heat-resistant high-temperature-resistant resin on the surface of the optical coating layer to form a heat-resistant high-temperature-resistant resin bottom coating 36;
a step (five) of coating UV resin on the outer surface of the transparent substrate 31 to form a surface hardening layer 32;
a sixth step of applying a tackifying functional resin to the outer surface of the surface hardened layer 32 to form a tackifying functional resin layer 33;
after the steps (one) to (six), the transparent substrate 31 is provided with the back plate main body 3, wherein the printing ink layer 34, the laser holographic image texture layer 35, the optical coating layer 36, the heat-resistant high-temperature-resistant functional resin bottom coating layer 37 are attached to the inner side surface of the transparent substrate 31 in sequence, and the surface hardening layer 31 and the tackifying functional resin coating layer 32 are coated on the outer side surface of the transparent substrate in sequence;
seventhly, carrying out an IMD (in-mold decoration) process on the backboard main body 3, namely putting the backboard main body 3 into a mold to carry out in-mold injection molding on the protective sleeve, wherein the backboard main body 3 is coated by hot melt resin to form a protective sleeve backboard part 1, and the hot melt resin extends along the edge of the backboard main body 3 towards the inner side surface to form a protective sleeve side wall part 2.
In the production method, after the step (four) is completed and before the step (five) is completed, high-pressure forming is carried out to enable the edge of the composite board to be slightly bent to be matched with the rear shell of the mobile phone, and then the finishing engraving process is carried out to carry out trimming treatment and accurate size.
Specific example 1:
1. the manufacturing process comprises the following steps: PMMA/PC clad plate → printing metal ink and color transparent ink and color covering ink → use of C2The process transfer resin generates a laser holographic image texture layer → two optical coating films with different reflectivities are carried out → the printing and coating of various functions are carried out according to the process requirement → the heat-resistant and high-temperature-resistant primer coating is coated → high-pressure molding and fine carving are carried out → the UV resin coating is carried out to form a surface hardening layer → the tackifying function coating is coated on the surface (upper surface) of the UV hardening resin layer → the IMD processing is carried out. The method specifically comprises the following steps:
step 1: printing transparent ink and covering color ink on the inner surface of the PMMA/PC composite board;
step 2: use of C2The process transfer printing resin generates a laser holographic image texture layer, the thickness of the resin for the image is 2.5-3.0 mu m, and the depth of the laser holographic image texture (grating) is less than or equal to 1 mu m;
and step 3: carrying out two kinds of optical coating with different reflectivities on the laser holographic image texture prepared in the step 2;
and 4, step 4: sequentially printing functional ink or coating functional resin;
and 5: high-pressure forming and fine carving;
step 6: coating UV resin to form a surface hardening layer;
and 7: coating a tackifying functional coating on the surface (upper surface) of the UV hardening resin layer;
and 8: performing IMD (8) processing.
IMD processing: in the embodiment, TPU hot melt adhesive granules with specific melt index are dried and injected into an in-mold injection molding machine, and are compounded with a PMMA/PC composite board after in-mold injection molding processing at the melting temperature of 250 ℃. And sticking a protective film to form the mobile phone sheath containing all the processes of the invention.
In the injection molding process in the mould, according to actual need, can adjust cavity thickness to adjust the whole thickness of protective sheath.
The tackifying functional coating plays a role: the composite strength of the PMMA/PC composite board and the TPU resin injection molding is ensured;
the heat-resistant and high-temperature-resistant coating plays a role in: the laser holographic texture and the ink appearance are protected from being changed. The tackifying and the heat-resistant and high-temperature-resistant coating are made of acrylic acid, polyurethane, water-based polyester resin and a mixed coating thereof. The concrete function is as follows: the adhesion promoting functional coating is coated to ensure that the stripping force is qualified and a mobile phone sheath product is not cracked after the adhesion promoting functional coating can be compounded with ABS resin on the common hardened resin surface with smooth surface and the wetting tension less than or equal to 0.28 in the IMD process; the heat-resistant and high-temperature-resistant coating protects the ink and the laser holographic image texture from discoloring just under the high-temperature procedure of IMD.
In this example, the adhesion promoter resin was applied with an aqueous primer: is prepared from the aqueous solution of polyethene imine through drying. Generally, the dry coating weight is 0.04-0.14g/m2, and the solid content is 0.7-5.5%; the primer layer had a dry weight of 0.14g/m2 and a thickness of 0.05 microns.
Specific example 2:
1. the manufacturing process comprises the following steps: PMMA/PC composite board → printing pearl-luster ink and transparent color printing ink and covering ink → using water transfer printing process to transfer resin to generate laser holographic image texture layer → transparent brightening optical coating → performing various printing and coating according to process requirements → coating heat-resistant and high-temperature-resistant functional primer layer → high-pressure forming and fine carving → performing UV resin coating to form surface hardening layer → coating tackifying functional coating on the surface (upper surface) of the UV hardening resin layer → performing IMD processing. The method specifically comprises the following steps:
step 1, printing pearl ink, transparent color ink and covering ink on the inner surface of the PMMA/PC composite board.
And 2, transferring resin by using a water transfer printing process to generate a laser holographic image texture layer, wherein the thickness of the resin for the image is 2.6 mu m, and the depth of the laser holographic image texture (grating) is less than or equal to 1 mu m.
And 3, carrying out transparent brightening type optical coating on the texture of the laser holographic image prepared in the step 2.
And 4, step 4: functional inks are printed or functional resins are coated in sequence.
And 5: and (3) high-pressure forming and fine carving, wherein the high-pressure forming enables the edge of the composite board to be subjected to hot pressing to be slightly bent so as to enable the edge of the composite board to be matched with the bent shape of the edge of the mobile phone rear shell, and the fine carving is to carry out trimming treatment so as to enable the size of the product to be accurate in place.
Step 6: the surface hardening layer is formed by UV resin coating.
And 7: on the surface (upper surface) of the UV curable resin layer, a tackifying functional coating is applied.
And 8: an IMD process is performed.
The function of coating the tackifying functional coating is as follows:
the smooth surface of the hardened resin surface with the wetting tension less than or equal to 0.28 is ensured in the IMD process, the stripping force is qualified after the hardened resin surface is compounded with ABS resin, and a mobile phone sheath product is not cracked.
The function of coating the high-temperature-resistant functional coating is as follows:
the protective ink layer, the laser holographic texture layer, the coating and the coating can bear the injection molding temperature of the molten ABS resin with the high temperature of 260 ℃ in the IMD process without changing the appearance, physical and chemical characteristics.
IMD processing: in the embodiment, ABS hot melt adhesive granules with specific melt index are dried and injected into an in-mold injection molding machine, and are compounded with a PMMA/PC composite board through an in-mold injection molding process at the melting temperature of 200-260 ℃ to be adhered with a protective film to form the mobile phone sheath containing the process.
In the injection molding course of working in the mould, according to actual need, can adjust cavity thickness control protective sheath thickness.
The tackifying functional coating and the heat-resistant and high-temperature-resistant functional coating used in the embodiment are solvent-based resins, which are the process requirements that the IMD processing temperature of ABS is higher than that of TPU. The chemical components of the polyurethane and the polyester resin are polyurethane and polyester resin and mixed coating thereof, the coating dry weight is generally 1.2-1.8 g/m2, and the thickness is less than or equal to 2 microns.
The invention utilizes the optical refraction and reflection principle generated by functional printing ink and coating to embody the color effect; the functional effect of the mobile phone protective case product is realized by utilizing UV hardening, texture transfer printing, precise coating and IMD processes; the laser holographic image effect is generated by the principle of optical interference and diffraction, and the design of the laser holographic anti-counterfeiting effect is provided so as to identify the authenticity of the product and protect the brand pattern;
through C2The UV transfer printing resin of the process generates a laser holographic image texture layer, the optical coating layer increases the reflection effect and brightness, the UV transfer printing resin has a surface hardening layer of the UV hardening resin, a tackifying functional coating and a heat-resistant and temperature-resistant functional coating through high-pressure forming and fine engraving, and hot melt adhesive resin such as TPU is used for IMD process processing.
In summary, the mobile phone protective sleeve uses acrylic plates or plates made of similar materials as the substrate, forms various functional layers by coating or attaching ink materials and various resin materials on the surfaces of the two sides of the substrate, and forms a laser holographic image texture layer by adopting a laser holographic image texture manufacturing technology, so that the mobile phone protective sleeve product has an anti-counterfeiting function, and the attractive decorative effect of the mobile phone protective sleeve product is incomparable to that of a common mobile phone protective sleeve; meanwhile, the anti-falling and anti-seismic performance of the mobile phone protective sleeve is further improved, the performance standard of the mobile phone rear shell can be achieved, and compared with the performance standard of a common mobile phone protective sleeve, the performance standard of the mobile phone protective sleeve is improved by multiple times.

Claims (11)

1. The utility model provides a cell-phone protective sheath, its is including connecting protective sheath back plate portion and protective sheath side wall portion as an organic whole, its characterized in that: the inside backplate main part that has of protective sheath backplate portion, the backplate main part includes a transparent substrate, and the coating has the surface hardening layer in proper order, increases viscous function resin coating in the outside surface of transparent substrate, and the inboard surface of transparent substrate has printing ink layer, laser holographic image texture layer, optical coating layer, hinders hot high temperature resistant function resin under coat in proper order, and has the hot melt resin layer of this backplate main part of complete cladding through injection moulding in the periphery of backplate main part in, and the hot melt resin layer extends the shaping along backplate main part edge side surface direction inwards protective sheath side wall portion.
2. A protective cover for a cellular phone according to claim 1, wherein: the transparent substrate is a printable PMMA/PC composite board or other high polymer resin boards.
3. A protective cover for a cellular phone according to claim 1, wherein: the surface hardening layer is UV hardening resin with the thickness less than or equal to 8 mu m and the hardness less than or equal to 6H.
4. A protective cover for a cellular phone according to claim 1, wherein: the tackifying functional resin coating is one or more coating layers formed by one or more of acrylic acid, polyurethane or waterborne polyester resin, and the thickness of the coating layer is less than or equal to 20 mu m.
5. A protective cover for a cellular phone according to claim 1, wherein: the printing ink layer is formed by silk-screen printing, offset printing, digital printing or gravure printing, the thickness of the ink layer is less than or equal to 100 mu m, and the type of the ink is one or more of functional ink, transparent and covering color ink, laser ink, various types of anti-counterfeiting ink and functional decorative ink.
6. A protective cover for a cellular phone according to claim 1, wherein: the laser holographic image texture layer is made of UV resin, after the UV resin is irradiated and cured by an ultraviolet light source, the resin material is transferred and printed by a transfer printing process to form the laser holographic image texture layer, the thickness of the laser holographic image texture layer is less than or equal to 2.6 mu m, and the depth of the laser holographic image texture (grating) is less than or equal to 1 mu m.
7. A protective cover for a cellular phone according to claim 1, wherein: the optical coating layer is transparent and reflective, and the thickness of the optical coating layer is in the hundred angstrom level.
8. A protective cover for a cellular phone according to claim 1, wherein: the heat-insulating temperature-resistant functional resin coating (bottom coating) is one to multiple coating layers of acrylic acid, polyurethane or waterborne polyester resin, the thickness is less than or equal to 30 mu m, and the dry coating weight is 0.05-3g/m2。
9. A protective cover for a cellular phone according to claim 1, wherein: the resin layer for IMD is hot melt adhesive resin with one or a mixture of TPU, ABS, PP and PE as main components and has injection molding temperature of 200-280 deg.c.
10. A method of manufacturing a protective cover for a cellular phone according to any one of claims 1 to 9, comprising: the method comprises the following steps:
coating one or more printing inks on the inner side surface of the transparent substrate to form a printing ink layer;
transferring a resin material on the outer surface of the printing ink layer through a transfer printing process to form a laser holographic image texture layer;
step three, attaching a transparent brightening optical coating on the surface of the texture layer of the laser holographic image prepared in the step two to form an optical coating layer;
coating heat-resistant high-temperature-resistant resin on the surface of the optical coating layer to form a heat-resistant high-temperature-resistant resin bottom coating;
coating UV resin on the outer side surface of the transparent substrate to form a surface hardening layer;
step six, coating tackifying functional resin on the outer surface of the surface hardening layer to form a tackifying functional resin layer;
after the steps (I) to (VI), a backboard main body which is sequentially attached with a printing ink layer, a laser holographic image texture layer, an optical coating layer, a heat-resistant high-temperature-resistant functional resin bottom coating layer and a surface hardening layer and a tackifying functional resin coating layer is sequentially coated on the outer side surface is formed on the inner side surface of the transparent substrate;
and step seven, carrying out an IMD process on the backboard main body, namely putting the backboard main body into a mould to carry out in-mould injection molding on the protective sleeve, wherein the backboard main body is coated by hot melt resin to form a protective sleeve backboard part, and the hot melt resin extends towards the inner side surface along the edge of the backboard main body to form a protective sleeve side wall part.
11. A method for producing a protective cover for a cellular phone according to claim 10, wherein: after the step (four) is completed and before the step (five) is completed, high-pressure forming is carried out to enable the edge of the composite board to be slightly bent to be matched with the rear shell of the mobile phone, and then an engraving process is carried out to carry out trimming and accurate size.
CN201911369248.4A 2019-12-26 2019-12-26 Mobile phone protective sleeve and production process thereof Pending CN111193819A (en)

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Application Number Priority Date Filing Date Title
CN201911369248.4A CN111193819A (en) 2019-12-26 2019-12-26 Mobile phone protective sleeve and production process thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113681935A (en) * 2021-08-13 2021-11-23 惠州市众力电子科技有限公司 Production process and application of transparent 3D glass fiber board with textures
WO2021258953A1 (en) * 2020-06-22 2021-12-30 Oppo广东移动通信有限公司 Housing assembly and preparation method therefor, and electronic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021258953A1 (en) * 2020-06-22 2021-12-30 Oppo广东移动通信有限公司 Housing assembly and preparation method therefor, and electronic device
CN113681935A (en) * 2021-08-13 2021-11-23 惠州市众力电子科技有限公司 Production process and application of transparent 3D glass fiber board with textures

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