Easily die-cut composite release film and adhesive tape thereof
By combining releasing agent, PET film, acrylic pressure sensitive adhesive and TPU film in the die-cut film, the existing release film is solved inadequate softness and tear problems when die-cutting automotive exterior parts, achieving high efficiency , continuous die-cutting process and low debris residue effect.
Patent Information
- Application Number
- CN202420593920.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-03-25
AI Technical Summary
The existing release films are not soft enough when die-cutting automotive exterior parts, resulting in poor die cutting, low efficiency and easy tear, making it impossible to achieve rapid continuous operation. Common release paper and PET films will lead to sticking paper. chips and deformation problems.
The easy-cut composite release film consisting of a heavy release agent coating, PET film, acrylic pressure-sensitive adhesive layer, TPU film, a second acrylic pressure-sensitive adhesive layer and a light release agent coating are used to control the Thickness and peeling force, combined with the tensile strength and elongation of high-performance acrylic pressure-sensitive adhesive and TPU film, form an efficient die-cut film.
It realizes efficient die cutting of soft viscoelastic tape, avoids tape deformation and release film tearing during die cutting, improves production efficiency, reduces debris residue, and improves appearance quality.
Smart Images
Figure CN222226249U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of release films, in particular to an easy-to-die-cut composite release film and an adhesive tape thereof. Background Art
[0002] At present, due to the irregular design and rib design of automobile exterior parts, as well as the high requirement for bonding strength, high-strength soft acrylic foam tape is required. However, due to the excessive softness of the tape, when die-cutting complex patterns, it will cause poor die-cutting of the product and make it impossible to discharge waste. At present, the commonly used release film materials for die-cutting bottom are release paper, PET release film, and PE release film.
[0003] In the prior art, when die-cutting with release paper, there will be scraps falling off, causing the die-cut products to be attached with paper scraps, resulting in abnormal appearance, and manual correction is required, which is inefficient and labor-intensive. When die-cutting with PET release film, due to the low elongation at break of PET, it is easy to tear the PET release film and cannot be operated quickly and continuously. When die-cutting with PE release film, because PE material is soft, has low tensile strength and is easy to deform, it will deform greatly with the foam tape sample during die-cutting, resulting in the tape sticking to the blade when die-cutting complex shapes, resulting in failure to discharge waste normally. Utility Model Content
[0004] Based on this, the purpose of the utility model is to provide an easy-to-die-cut composite release film to solve the problem of poor die-cutting performance and low die-cutting efficiency when using conventional release films to die-cut complex graphics with soft viscoelastic tapes currently used in the automotive industry.
[0005] The purpose of the utility model is achieved through the following technical solutions:
[0006] The invention discloses an easy-to-die-cut composite release film, comprising a heavy release agent coating, a first PET film layer, a first acrylic pressure-sensitive adhesive layer, a TPU film layer, a second acrylic pressure-sensitive adhesive layer, a second PET film layer and a light release agent coating which are stacked in sequence.
[0007] Furthermore, the thickness of the heavy release agent coating is 0.3-0.5 μm, and the peeling force is 40-60 gf / 25 mm.
[0008] Furthermore, the thickness of the first PET film layer is 40-60 μm, the tensile strength is 180-200 MPa, and the elongation at break is ≤200%.
[0009] Furthermore, the thickness of the first acrylic pressure-sensitive adhesive layer is 5-10 μm, and the peeling force is ≥1800 gf / 25 mm.
[0010] Furthermore, the TPU film layer has a thickness of 15-25 μm, a tensile strength of ≥20 MPa, and an elongation at break of ≥1200%.
[0011] Furthermore, the second acrylic pressure-sensitive adhesive layer has a thickness of 5-10 μm and a peeling force of ≥1800 gf / 25 mm.
[0012] Furthermore, the second PET film layer has a thickness of 25-40 μm, a tensile strength of 180-200 MPa, and an elongation at break of ≤200%.
[0013] Furthermore, the light release agent coating has a thickness of 0.3-0.5 μm and a peeling force of 10-20 gf / 25 mm.
[0014] Furthermore, the heavy release agent coating and the light release agent coating are made of silicone release agent.
[0015] An adhesive tape comprises the above-mentioned easy-to-die-cut composite release film.
[0016] The beneficial effects of the utility model are:
[0017] The utility model is to coat high-performance acrylic pressure-sensitive adhesive with excellent adhesion to TPU on both sides of a TPU film substrate, then laminate a PET film with excellent tensile strength, and finally coat 40-60gf / 25mm heavy silicone oil release agent and 10-20gf / 25mm light silicone oil release agent on the outer side of the PET film, respectively, to prepare an easy-to-die-cut composite release film. The utility model controls the thickness, tensile strength, and elongation at break of the PET film and the TPU film, and composites the high-tensile-strength PET film and the high-elongation at break TPU film together through high-performance acrylic pressure-sensitive adhesive, so that the composite release film has both the high tensile strength of the PET film, so that the soft viscoelastic tape will not be deformed with the release film during the die-cutting process; at the same time, it has excellent anti-fracture and anti-tearing properties, so that in the rapid die-cutting process, the production will not be discontinuous and the efficiency will not be low due to the tearing of the release film, and the composite film will not have debris left on the surface of the tape, thereby achieving easy die-cutting and high efficiency for the soft viscoelastic tape. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the structure of the easy-to-die-cut composite release film of the utility model;
[0019] Figure numerals: 10 - heavy release agent coating; 20 - first PET film layer; 30 - first acrylic pressure-sensitive adhesive layer; 40 - TPU film layer; 50 - second acrylic pressure-sensitive adhesive layer; 60 - second PET film layer; 70 - light release agent coating. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] In the description of the present invention, it should be noted that the terms "vertical direction", "upper", "lower", "horizontal" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0023] Reference Figure 1 As shown, an embodiment of the utility model provides an easy-to-die-cut composite release film, including a heavy release agent coating 10, a first PET film layer 20, a first acrylic pressure-sensitive adhesive layer 30, a TPU film layer 40, a second acrylic pressure-sensitive adhesive layer 50, a second PET film layer 60 and a light release agent coating 70 stacked in sequence.
[0024] Specifically, the easy-to-die-cut composite release film is prepared by the following steps:
[0025] (1) selecting a transparent first PET film with a thickness of 40-60 μm, a tensile strength of 180-200 MPa, and an elongation at break of ≤200%, and coating a layer of a heavy release agent with a thickness of 0.3-0.5 μm and a peeling force of 40-60 gf / 25 mm on one side of the first PET film to form a heavy release agent coating 10;
[0026] (2) Then, a first acrylic pressure-sensitive adhesive layer 30 with a thickness of 5-10 μm and a peeling force of ≥1800 gf / 25 mm is coated on the side of the first PET film away from the heavy release agent coating 10, and after curing at 90-100° C. for 2-3 min, a TPU film with a thickness of 15-25 μm, a tensile strength of ≥20 MPa, and an elongation at break of ≥1200% treated by a corona treatment machine is laminated;
[0027] (3) selecting a transparent second PET film with a thickness of 25-40 μm, a tensile strength of 180-200 MPa, and an elongation at break of ≤200%, and coating a layer of a light release agent with a thickness of 0.3-0.5 μm and a peeling force of 10-20 gf / 25 mm on one side of the second PET film to form a light release agent coating 70;
[0028] (4) Then, a second acrylic pressure-sensitive adhesive layer 50 with a thickness of 5-10 μm and a peeling force of ≥1800 gf / 25 mm is coated on the side of the second PET film away from the light release agent coating 70. After curing at 90-100° C. for 2-3 min, the second PET film is bonded to the side of the TPU film in step (2) away from the first acrylic pressure-sensitive adhesive layer 30 through the second acrylic pressure-sensitive adhesive layer 50 to form a semi-finished product.
[0029] (5) pressing and rolling the semi-finished product in step (4) at 40-60° C. and a pressure of 0.5-0.6 MPa;
[0030] (6) The rolled product was aged at 50° C. for 3 days to obtain an easily die-cut composite release film for use in soft viscoelastic adhesive tapes.
[0031] The heavy release agent coating 10 and the light release agent coating 70 are made of silicone release agent.
[0032] The utility model also provides a soft viscoelastic adhesive tape, which includes the above-mentioned easy-to-die-cut composite release film.
[0033] In order to further illustrate the structure of the utility model applicable to the easy-to-die-cut composite release film of the soft viscoelastic adhesive tape, the following is described through specific embodiments:
[0034] Example 1
[0035] In this embodiment, the easy-to-die-cut composite release film includes a silicone heavy release agent coating 10, a first PET film layer 20, a first acrylic pressure-sensitive adhesive layer 30, a TPU film layer 40, a second acrylic pressure-sensitive adhesive layer 50, a second PET film layer 60 and a silicone light release agent coating 70 stacked in sequence from top to bottom.
[0036] The thickness of the silicone heavy release agent coating 10 is 0.5 μm, and the peeling force is 60 gf / 25 mm;
[0037] The first PET film layer 20 has a thickness of 50 μm, a tensile strength of 180 MPa, and an elongation at break of 150%;
[0038] The first acrylic pressure-sensitive adhesive layer 30 has a thickness of 5 μm and a peeling force of 2100 gf / 25 mm;
[0039] The TPU film layer 40 has a thickness of 15 μm, a tensile strength of 70 MPa, and an elongation at break of 1200%;
[0040] The second acrylic pressure-sensitive adhesive layer 50 has a thickness of 10 μm and a peeling force of 1800 gf / 25 mm;
[0041] The second PET film layer 60 has a thickness of 30 μm, a tensile strength of 190 MPa, and a breaking elongation of 180%.
[0042] The light release agent coating 70 has a thickness of 0.5 μm and a peeling force of 20 gf / 25 mm;
[0043] A soft viscoelastic adhesive tape, the adhesive tape comprising the easy-to-die-cut composite release film in embodiment 1.
[0044] Example 2
[0045] In this embodiment, the easy-to-die-cut composite release film includes a silicone heavy release agent coating 10, a first PET film layer 20, a first acrylic pressure-sensitive adhesive layer 30, a TPU film layer 40, a second acrylic pressure-sensitive adhesive layer 50, a second PET film layer 60 and a silicone light release agent coating 70 stacked in sequence from top to bottom.
[0046] The thickness of the silicone heavy release agent coating 10 is 0.4 μm, and the peeling force is 50 gf / 25 mm;
[0047] The first PET film layer 20 has a thickness of 40 μm, a tensile strength of 200 MPa, and an elongation at break of 180%;
[0048] The first acrylic pressure-sensitive adhesive layer 30 has a thickness of 8 μm and a peeling force of 1800 gf / 25 mm;
[0049] The TPU film layer 40 has a thickness of 20 μm, a tensile strength of 70 MPa, and an elongation at break of 1200%;
[0050] The second acrylic pressure-sensitive adhesive layer 50 has a thickness of 8 μm and a peeling force of 1800 gf / 25 mm;
[0051] The second PET film layer 60 has a thickness of 25 μm, a tensile strength of 200 MPa, and an elongation at break of 180%;
[0052] The thickness of the light release agent coating 70 is 0.4 μm, and the peeling force is 15 gf / 25 mm.
[0053] A soft viscoelastic adhesive tape, the adhesive tape comprising the easy-to-die-cut composite release film in embodiment 2.
[0054] Example 3
[0055] In this embodiment, the easy-to-die-cut composite release film includes a silicone heavy release agent coating 10, a first PET film layer 20, a first acrylic pressure-sensitive adhesive layer 30, a TPU film layer 40, a second acrylic pressure-sensitive adhesive layer 50, a second PET film layer 60 and a silicone light release agent coating 70 stacked in sequence from top to bottom.
[0056] The thickness of the silicone heavy release agent coating 10 is 0.3 μm, and the peeling force is 40 gf / 25 mm;
[0057] The first PET film layer 20 has a thickness of 60 μm, a tensile strength of 180 MPa, and an elongation at break of 140%;
[0058] The first acrylic pressure-sensitive adhesive layer 30 has a thickness of 10 μm and a peeling force of 1800 gf / 25 mm;
[0059] The TPU film layer 40 has a thickness of 25 μm, a tensile strength of 70 MPa, and an elongation at break of 1200%;
[0060] The second acrylic pressure-sensitive adhesive layer 50 has a thickness of 5 μm and a peeling force of 2200 gf / 25 mm;
[0061] The second PET film layer 60 has a thickness of 40 μm, a tensile strength of 180 MPa, and an elongation at break of 140%.
[0062] The light release agent coating 70 has a thickness of 0.3 μm and a peeling force of 10 gf / 25 mm.
[0063] The heavy release agent coating 10 and the light release agent coating 70 are made of silicone release agent.
[0064] A soft viscoelastic adhesive tape, the adhesive tape comprising the easy-to-die-cut composite release film in embodiment 3.
[0065] The above only expresses the preferred technical solution of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.
Claims
1. An easy-to-die-cut composite release film, characterized in that: The invention comprises a heavy release agent coating, a first PET film layer, a first acrylic pressure-sensitive adhesive layer, a TPU film layer, a second acrylic pressure-sensitive adhesive layer, a second PET film layer and a light release agent coating which are stacked in sequence.
2. The easy-to-die-cut composite release film according to claim 1, characterized in that: The thickness of the heavy release agent coating is 0.3-0.5 μm, and the peeling force is 40-60 gf / 25 mm.
3. The easy-to-die-cut composite release film according to claim 1, characterized in that: The thickness of the first PET film layer is 40-60 μm, the tensile strength is 180-200 MPa, and the elongation at break is ≤200%.
4. The easy-to-die-cut composite release film according to claim 1, characterized in that: The thickness of the first acrylic pressure-sensitive adhesive layer is 5-10 μm, and the peeling force is ≥1800 gf / 25 mm.
5. The easy-to-die-cut composite release film according to claim 1, characterized in that: The TPU film layer has a thickness of 15-25 μm, a tensile strength of ≥20 MPa, and an elongation at break of ≥1200%.
6. The easy-to-die-cut composite release film according to claim 1, characterized in that: The thickness of the second acrylic pressure-sensitive adhesive layer is 5-10 μm, and the peeling force is ≥1800 gf / 25 mm.
7. The easy-to-die-cut composite release film according to claim 1, characterized in that: The thickness of the second PET film layer is 25-40 μm, the tensile strength is 180-200 MPa, and the elongation at break is ≤200%.
8. The easy-to-die-cut composite release film according to claim 1, characterized in that: The light release agent coating has a thickness of 0.3-0.5 μm and a peeling force of 10-20 gf / 25 mm.
9. The easy-to-die-cut composite release film according to claim 1, characterized in that: The material of the heavy release agent coating and the light release agent coating is silicone release agent.
10. An adhesive tape, characterized in that: The invention comprises the easy-to-die-cut composite release film as described in any one of claims 1 to 9.