CN115584215A - Reworking double-sided foam adhesive tape, reworking method and preparation method - Google Patents
Reworking double-sided foam adhesive tape, reworking method and preparation method Download PDFInfo
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- CN115584215A CN115584215A CN202211346276.6A CN202211346276A CN115584215A CN 115584215 A CN115584215 A CN 115584215A CN 202211346276 A CN202211346276 A CN 202211346276A CN 115584215 A CN115584215 A CN 115584215A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/24—Presence of a foam
- C09J2400/243—Presence of a foam in the substrate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2475/00—Presence of polyurethane
- C09J2475/006—Presence of polyurethane in the substrate
Abstract
The invention discloses a reworking double-sided foam adhesive tape, which comprises: a tear layer having first and second surfaces opposite in a thickness direction; the two foam layers are respectively arranged on the first surface and the second surface of the tearing layer; the two pressure-sensitive adhesive layers are respectively arranged on the surfaces of the foam layers, which are opposite to the tearing layer; the tear layer comprises a plurality of tear strips, the length of the tear strips extends along the first direction, the adjacent tear strips are arranged, and the adjacent tear strips are mutually spaced and/or connected through a point broken line. This double-sided bubble cotton tape's of doing over again range upon range of rational in infrastructure, the tearing layer sets up to the strip tear tape that extends along same direction, and the interval that sets up between the adjacent tear tape is convenient for tear, or utilizes the point broken string that sets up between the adjacent tear tape to tear, and then the tear tape phase separation, and the bubble cotton layer phase separation that realizes tearing layer two surfaces reaches the purpose of doing over again, reduces the work load on manual division bubble cotton layer in the operation of doing over again, and is easy and simple to handle, efficient.
Description
Technical Field
The invention relates to the technical field of electronic equipment adhesive tapes, in particular to a reworked double-sided foam adhesive tape, a reworking method and a preparation method.
Background
The double-sided foam adhesive tape is an adhesive tape which takes a foam layer as a base material and is coated with pressure-sensitive adhesive on two opposite surfaces in the thickness direction, is mainly used for fixing a back shell, a screen frame body, a battery and the like of an electronic product, and has good buffering performance. The problem such as inaccurate or attached work piece damage of counterpoint can appear unavoidably in the in-service use in-process of two-sided bubble cotton sticky tape, needs to remove the work piece surface of two-sided sticky tape from both sides, and the processing of doing over again promptly, traditional bubble cotton sticky tape can't satisfy the requirement of doing over again.
CN208218754U discloses a PU black foam double-sided tape material, which is formed by bonding an easy-to-draw adhesive material layer, a foam layer, an ultra-thin black PET substrate layer, a shading adhesive material layer and a double-silicon PET release film substrate layer from top to bottom in sequence. This cotton double faced adhesive tape material of bubble reworks the operation and includes: and dividing the foam layer into two parts on the section of the adhesive tape in the thickness direction by using a blade, and then removing the adhesive material layer, the PET substrate layer and the laminated body of the residual foam. The drawbacks of rework operations are: the thickness of the foam layer is small, and the PET substrate layer is inevitably damaged in the process that the blade divides the foam into two parts; secondly, the foam adhesive tape is adhered between the two hard workpieces, the operation action of cutting the foam by the blade is limited, the workload is large, and the consumed time is long. In addition, the workpieces bonded by the double-sided adhesive tape are in a scarf joint structure, and the blade cannot extend between the two workpieces, so that the application range of the existing reworked double-sided foam adhesive tape sold in the market is further narrowed.
Therefore, there is a need for an improved foam tape.
Disclosure of Invention
One of the purposes of the present invention is to overcome the defects in the prior art, and provide a reworked double-sided foam adhesive tape, wherein the tear layers are arranged in a strip shape extending along the same direction, and the gap or the point breaking line arranged between adjacent tear strips is convenient for tearing to separate the tear strips, so that the foam layers on the two surfaces of the tear layers are separated to achieve the reworking purpose.
In order to realize the process effect, the technical scheme of the invention is as follows: a reworked double-sided foam tape comprising: a tear layer having first and second surfaces opposite in a thickness direction; the two foam layers are respectively arranged on the first surface and the second surface of the tearing layer; the two bonding layers are respectively arranged on the surfaces of the foam layers back to the tearing layer; the tearing layer comprises a plurality of tearing strips, the length of each tearing strip extends along the first direction, the tearing strips are adjacent to each other, and the tearing strips are adjacent to each other and are arranged at intervals and/or connected through point broken lines.
The preferable technical scheme is that a thinning unit is arranged at the point broken line connecting position of the adjacent tearing strip, and the thickness of the thinning unit is gradually reduced from two sides to the middle along the parallel direction.
The preferable technical scheme is that the first direction is consistent with the length direction of the reworked double-sided foam adhesive tape.
The second purpose of the present invention is to overcome the defects in the prior art, and to provide a rework method for reworking a double-sided foam adhesive tape, wherein a workpiece is bonded by the double-sided foam adhesive tape, comprising the following steps:
s1: breaking two foam layers from the thickness direction section of the edge of the reworked double-sided foam adhesive tape until the tearing layer at the edge of the reworked double-sided foam adhesive tape is separated from the two foam layers, and tearing a tear tape along a first direction to obtain an independent tear tape;
s2: drawing the tearing strip along the parallel direction and towards the outer side of the workpiece until the tearing strip is separated from the workpiece, so that the tearing layer is completely separated from the foam layer;
s3: and peeling the laminated body containing the adhesive layer and the residual foam layer from the surface of the workpiece.
Preferably, the S2 further comprises: and (4) arranging extension sections corresponding to each other on the end part of the independent tear strip obtained in the step (S1) to obtain a tear end part.
Preferably, the surface of the tearing layer is a rough surface.
The preferable technical scheme is that the tearing end part comprises a traction section and a fixed section, and the traction section is folded and pressed on the fixed section.
The preferable technical scheme is that the width of the tear tape is 0.5 to 1.5mm, and the thickness of the tear tape is 10 to 30 mu m.
The invention also aims to overcome the defects in the prior art and provide a preparation method of the reworked double-sided foam adhesive tape, which comprises the following steps:
s21: preparing a tearing layer with a release film lined on the surface, applying a foaming raw material on the surface of the tearing layer opposite to the release film, and foaming to obtain a first foam layer and prepare a foam core layer blank;
s22: removing the release film of the foam core layer blank obtained in the step S21, applying a foaming raw material on the surface of the tearing layer back to the first foam layer, and foaming to obtain a second foam layer to obtain a foam core layer;
s23: and (5) applying adhesives to the two opposite surfaces in the thickness direction of the foam core layer obtained in the step (S22) to prepare the reworked double-sided foam adhesive tape with the surface bonding layer.
The preferable technical scheme is that the first foam layer and the second foam layer are both polyurethane foam.
The invention has the advantages and beneficial effects that:
the reworking double-sided foam adhesive tape is reasonable in laminated structure of a foam layer, a tearing layer and the foam layer, tearing strips are formed by arranging the tearing layer into strips extending in the same direction, gaps arranged between every two adjacent tearing strips are convenient to tear, the tearing strips are separated, strip-shaped foam in the gaps are cut by the traction force of the tearing strips, and the foam layer on the two surfaces of the tearing layer is separated to achieve the reworking purpose; the tearing and breaking are realized by utilizing the point breaking line arranged between the adjacent tearing strips, the adjacent tearing strips are separated, the foam layers on the two surfaces of the tearing layer can be separated, the rework purpose is achieved, the workload of manually cutting the foam layers in the rework operation is reduced, the operation is simple and convenient, and the efficiency is high;
the laminated structure of the foam layer, the tearing layer and the foam layer is prepared on the surface of the tearing layer in a foaming way, so that the total thickness of the product is controllable and adjustable, the flexibility is better, and the product can be further suitable for different occasions; and the risk of layering in the use process is reduced by utilizing the internal polymerization between the foam layer and the tearing layer.
Drawings
FIG. 1 is a schematic structural view of a reworked double-sided foam tape of the present invention;
FIG. 2 is a diagram showing the use state of the reworking process of the double-sided foam adhesive tape according to the present invention;
FIG. 3 is a schematic illustration of an embodiment of the present invention in an isolated tear layer tear condition;
FIG. 4 is a schematic view of a single tear layer tear condition one of another embodiment of the present invention;
FIG. 5 is a schematic view of a separate tear layer tear condition of another embodiment of the present invention;
FIG. 6 is a schematic view of a third, separate tear layer tear condition in accordance with another embodiment of the present invention.
In the figure: 1. a tear layer; 2. soaking a cotton layer; 3. an adhesive layer; 4. a release layer; 10. tearing a strip; 11. spacing; 12. point disconnection; 101. tearing the extension section.
Detailed Description
The following examples are provided to further illustrate embodiments of the present invention. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Starting materials
Tearing the layer:
PET polyester, model FG21, supplied by rekey ltd, china;
bonding layer: acrylic pressure sensitive adhesive, model number LT-0356, supplied by ningbo lvtian adhesive limited;
preparing a foam layer:
firstly, foaming main agent polyisocyanate and polyol are mixed according to a mol ratio of 1.1:1, mixing, wherein in addition to polyisocyanate and polyol which are main foaming agents, the foaming raw materials also contain 0.35 percent of catalyst (type A-33), 4 percent of foaming agent, 1.75 percent of foam stabilizer and 2.5 percent of color paste according to mass fraction; the foaming temperature is 70 to 75 ℃, the foaming time is 5min, and the density of the obtained foam is 195 to 215kg/m 2 。
Double-sided foam adhesive tape
The surface of at least one bonding layer is provided with a release layer in a fitting manner so as to protect the bonding layer; furthermore, release layer is two-sided release layer, and the two-sided cotton sticky tape of bubble of being convenient for realizes the rolling from the type layer through the one deck.
The total thickness of the two foam layers is 150 to 1200 mu m; the thickness of the adhesive layer is 2 to 80 μm.
The bonding layer for bonding the workpiece in the reworked double-sided foam adhesive tape is usually a pressure-sensitive adhesive, and can be selected from acrylate pressure-sensitive adhesive, rubber pressure-sensitive adhesive and polyurethane pressure-sensitive adhesive. The foam layer can be selected from EVA, PE, XPE, PU, EPE and the like, and the foam layer is also provided with elastic and bendable sheets.
A first direction
The first direction and the film length direction of the tearing layer form any included angle, namely the first direction is consistent with the film length direction of the tearing layer, or is arranged in an acute angle or an obtuse angle. When the tearing layer is combined with the foam to form the double-sided adhesive tape for use, in order to smoothly tear and pull the strip-shaped tearing strip away from the outer side edge of the workpiece, further, the first direction and the film length direction of the tearing layer form an acute angle, and the acute angle is 0-15 degrees. In order to facilitate processing and simplify the production process, further, the first direction is consistent with the film length direction of the tearing layer.
Tear layer
The tearing layer is made of one of polyester, polyamide and polyethylene. The tearing layer is arranged into a strip shape extending along the same direction to form a tearing strip; the tear tape may be in the form of fibers such as carbon fibers. In order to improve the efficiency of reworking, further, the tearing layer is arranged into a strip shape extending along the same direction. In order to realize that the tear tape is folded to form a shearing force in the tearing process and ensure the mechanical strength and flexibility of the tear tape, the thickness of the tear tape is further 10 to 30 micrometers. Furthermore, the width of the tear tape is 0.5 to 1.5mm.
The surface of the tearing strip is a rough surface, so that the adhesive force with the foam layer is increased on one hand; on the other hand, when the end part of the tearing strip is connected with the extension section in the reworking process, the bonding firmness with the extension section can be increased.
In order to be beneficial to tearing and separating between the tearing strips and improve the separation efficiency, the point broken line connecting part between the adjacent tearing strips is provided with a thinning unit, and the thickness of the thinning unit is gradually reduced from two sides to the middle along the parallel direction. The first surface and the second surface of the tearing layer are both provided with thinning units, and the thinning units on the first surface and the second surface are arranged in one-to-one correspondence; or one of the first surface and the second surface is provided with a thinning unit. The long edge of the tear tape arranged at intervals is arranged to be a thinning edge, and the thickness of the thinning edge is gradually reduced from the tear tape main body to the side edge along the parallel direction.
Release film
In the preparation process of the reworked double-sided foam adhesive tape, the surface of the tearing layer is lined with a release film, and foam preparation on the two sides of the tearing layer with intervals or point broken lines is realized through the release film. The release film is coated with the easy-to-tear glue on the surface, so that the release film is not easy to separate in the foaming process of the foaming raw material, and the processing stability is improved. The easy-to-tear glue can be separated with the release film without residual glue.
In one embodiment, the tear layer 1 is made of PET polyester, and adjacent tear strips are connected by a dot-broken line, as shown in fig. 1, the laminated structure of the reworked double-sided foam tape sequentially comprises: the adhesive layer 3, the foam layer 2, the tearing layer 1, the foam layer 2 and the adhesive layer 3, the release layer 4 is attached to the surface of one adhesive layer in the reworked double-sided foam adhesive tape, the reworked double-sided foam adhesive tape is convenient to roll, and the width of the reworked double-sided foam adhesive tape is 8mm, and the thickness of the reworked double-sided foam adhesive tape is 300 micrometers.
In another embodiment, the tearing layer 1 is made of PET polyester, the tearing strips are arranged at intervals, and the laminated structure is unchanged.
The preparation method of the reworked double-sided foam adhesive tape comprises the following steps:
s21: mixing foaming raw materials, preparing a tearing layer with a release film lined on the surface, applying the foaming raw materials on the surface of the tearing layer, which is opposite to the release film, by taking a composite film of the release film and the tearing layer as a base material, coating a foam coating with a preset thickness through a coating die head with preset parameters, and foaming to obtain a first foam layer to prepare a foam core layer blank;
s22: tearing off the release film of the foam core layer blank obtained in the step S21, applying a foaming raw material on the surface of the tearing layer back to the first foam layer, foaming in the same way to obtain a second foam layer, and preparing the foam core layer with a structure of the first foam layer/the tearing layer/the second foam layer;
s23: and applying adhesives to the two opposite surfaces in the thickness direction of the foam core layer obtained in the step S22 to prepare the reworked double-sided foam adhesive tape with the surface bonding layer.
After the release layer 4 of the reworking double-sided foam adhesive tape is peeled off, the double-sided adhesive layer 3 is respectively adhered to a workpiece, and reworking is carried out when the foam double-sided adhesive tape is not adhered to the workpiece or the workpiece is damaged, wherein the reworking method comprises the following steps:
s1: the method comprises the following steps of breaking two layers of foam layers 2 from the thickness direction section of the edge of a reworked double-sided foam adhesive tape by using a blade as shown in figure 2 until a tearing layer 1 at the edge of the reworked double-sided foam adhesive tape is separated from the two layers of foam layers 2, tearing the end part of a tearing strip 10 along a first direction to obtain an independent tearing strip 10, wherein the end part of the independent tearing strip 10 is provided with extension sections 101 in one-to-one correspondence to obtain the tearing end part.
S2: clamping the tear tape 10 along the arrangement direction by using a hand or a clamp, and drawing the tear tape 10 towards the outer side of the workpiece until the tear tape 10 is separated from the workpiece as shown in figures 3 to 5, so that the tear layer 1 is completely separated from the foam layer 2;
s3: the laminate comprising the adhesive layer 3 and the residual foam layer 2 was peeled from the surface of the workpiece.
In another specific embodiment, the tearing end part in the step S2 comprises a pulling section and a fixing section, and the pulling section is folded and pressed on the fixing section. As shown in fig. 6 until the tear strip 10 is disengaged from the workpiece.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A reworked double-sided foam adhesive tape is characterized by comprising:
a tear layer having first and second surfaces opposite in a thickness direction;
the two foam layers are respectively arranged on the first surface and the second surface of the tearing layer;
the two bonding layers are respectively arranged on the surfaces of the foam layers back to the tearing layer;
the tearing layer comprises a plurality of tearing strips, the length of each tearing strip extends along the first direction, the tearing strips are adjacent to each other, and the tearing strips are adjacent to each other and are arranged at intervals and/or connected through point broken lines.
2. The reworked double-sided foam tape according to claim 1, wherein a thinning unit is arranged at the point-break line connection part adjacent to the tear strip, and the thickness of the thinning unit is gradually reduced from two sides to the middle along the juxtaposition direction.
3. The reworked double-sided foam tape according to claim 1 or 2, wherein the first direction is the same as the length direction of the reworked double-sided foam tape.
4. A reworking method for reworking a double-sided foam adhesive tape is characterized in that a workpiece is bonded by the double-sided foam adhesive tape, and the reworking method comprises the following steps:
s1: breaking two foam layers from the thickness direction section of the edge of the reworked double-sided foam adhesive tape until the tearing layer at the edge of the reworked double-sided foam adhesive tape is separated from the two foam layers, and tearing a tear tape along a first direction to obtain an independent tear tape;
s2: drawing the tearing strip along the parallel direction and towards the outer side of the workpiece until the tearing strip is separated from the workpiece, so that the tearing layer is completely separated from the foam layer;
s3: and peeling the laminated body containing the adhesive layer and the residual foam layer from the surface of the workpiece.
5. The method of reworking a double-sided foam adhesive tape according to claim 4, wherein S2 further comprises: and (4) arranging extension sections corresponding to each other on the end part of the independent tear strip obtained in the step (S1) to obtain a tear end part.
6. A method of reworking a double-sided foam tape according to claim 5, wherein the surface of the tear layer is roughened.
7. The method for reworking the double-sided foam adhesive tape according to claim 5 or 6, wherein the tearing end comprises a pulling section and a fixing section, and the pulling section is folded and pressed on the fixing section.
8. The reworking method of the reworked double-sided foam adhesive tape according to claim 4, wherein the width of the tear tape is 0.5 to 1.5mm, and the thickness of the tear tape is 10 to 30 μm.
9. A preparation method of a reworked double-sided foam adhesive tape is characterized by comprising the following steps:
s21: preparing a tearing layer with a release film lined on the surface, applying a foaming raw material on the surface of the tearing layer opposite to the release film, and foaming to obtain a first foam layer and prepare a foam core layer blank;
s22: removing the release film of the foam core layer blank obtained in the step S21, applying a foaming raw material on the surface of the tearing layer back to the first foam layer, and foaming to obtain a second foam layer to obtain a foam core layer;
s23: and applying adhesives to the two opposite surfaces in the thickness direction of the foam core layer obtained in the step S22 to prepare the reworked double-sided foam adhesive tape with the surface bonding layer.
10. The method for preparing rework double-sided foam tape of claim 9, wherein the first foam layer and the second foam layer are both polyurethane foam.
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| CN202211346276.6A CN115584215B (en) | 2022-10-31 | 2022-10-31 | Reworked double-sided foam adhesive tape, reworking method and preparation method |
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