Film stripping force testing method
By setting pads on the substrate and using PET film and release film to form a filling space and performing 180° peeling force test, the problem of film bending deformation in wet glue test is solved, improving the accuracy of peeling force test and reducing production costs.
Patent Information
- Application Number
- CN202411841916.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-03-25
AI Technical Summary
In the prior art, the cross-pull method of testing peel strength of wet glue will cause the film to bend and deform, affect the test results of peeling force, and lead to inaccurate test results.
A film peeling force testing method is adopted. By setting two pads at intervals on the substrate, and using the release film and PET film in combination, a filling space is formed and glue is filled. After curing, a film connecting the PET film and the substrate is formed, and the test results are obtained through the 180° peeling force test.
By setting up the substrate and pads, the film is avoided bending and the accuracy of the test results is improved; by setting up the PET film and release film, the glue is prevented from flowing out and adhesion, reducing production costs and ensuring the accuracy of the test results.
Smart Images
Figure CN119688575A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of adhesives, and in particular to a method for testing the peeling force of a film. Background Art
[0002] The information and digital age has brought about the rapid development of electronic technology. Smart phones, computers and other color electronic display devices are increasingly used in life. However, some products will have bubbles and cracks during use. These problems will bring serious problems to display manufacturers. In order to ensure the function of the adhesive, peel force testing is a common part of the adhesive technology field before the product leaves the factory, and peel force has become an important indicator for dividing adhesive grades and application occasions.
[0003] In the related art, the method for testing the peel strength of wet glue is to adopt a cross-pulling method. Since the film is a non-rigid material, the cross-pulling test method will cause the film to bend and deform during the test, affecting the test result of the peel strength. Summary of the invention
[0004] Based on this, it is necessary to provide a film peeling force testing method that can ensure the accuracy of the peeling force test results.
[0005] A film peeling force testing method, comprising:
[0006] Adhere two gasket strips to the substrate at intervals, and make the two gasket strips extend out of the substrate;
[0007] A release film is attached to a side of the substrate away from the two cushion strips, and the release film is partially extended out of the substrate. The two cushion strips extending out of the substrate are attached to the release film extending out of the substrate, and a filling space is formed between the two cushion strips, the substrate and the release film.
[0008] Filling the filling space with glue and pasting the PET film on the glue;
[0009] The glue is cured to form a film connecting the PET film and the substrate, the PET film and the release film, and the two cushion strips are pulled out to obtain a test strip;
[0010] The release film is torn off, and a 180° peeling force test is performed on the film and the substrate using a peeling force testing machine.
[0011] By setting the substrate, the substrate can well fix and shape the film, avoid bending of the film during the peeling force test, and improve the accuracy of the peeling force test result; by arranging two pads on the substrate at intervals, and the two pads extending out of the substrate are adhered to the release film extending out of the substrate, the two pads on the substrate can block the glue on the substrate, and the two pads extending out of the substrate block the glue on the release film extending out of the substrate, which can facilitate the production of the film and avoid the waste of glue caused by the glue flowing out of the filling space, thereby reducing the production cost; by adhering the PET film to the glue, the cured film can be firmly adhered to the PET film, and the setting of the PET film and the release film prevents the test sample from adhering to other objects before the peeling force test, thereby affecting the accuracy of the peeling force test result. The release film can be torn off before the test, and the film and the substrate can be subjected to a 180° peeling force test by a peeling force testing machine to ensure the accuracy of the peeling force test result. The present application tests the wet glue by adopting a 180° peel force test method, which can greatly reduce the problem of bending and deformation of the film and further ensure the peel force test results.
[0012] In one embodiment, the step of testing the peeling force between the film and the substrate by a peeling force testing machine comprises:
[0013] The end of the film and the PET film away from the substrate is a free end, and the end of the substrate close to the free end is a clamping end; the first clamp of the peeling force tester is operated to fix the clamping end, and the second clamp of the peeling force tester is operated to fix the free end; wherein the first clamp is arranged opposite to the second clamp;
[0014] A force is applied to the first clamp to move the first clamp in a direction away from the second clamp, so as to peel the film from the substrate and obtain the peeling force of the film.
[0015] In one embodiment, before the two cushion strips are pulled out, the following steps are also included:
[0016] The PET film and the release film are trimmed to make the PET film and the release film match the shape of the film.
[0017] In one embodiment, the step of filling the glue into the filling space comprises:
[0018] injecting the glue into the filling space;
[0019] Let it stand for a set time, and after the glue flows naturally, use a scraper to scrape the glue flat.
[0020] In one embodiment, injecting the glue into the filling space comprises:
[0021] The glue is injected into the filling space in an S-shaped curve.
[0022] In one embodiment, the glue is AB glue.
[0023] AB glue is a two-component adhesive, which consists of component A and component B. These two components react chemically after mixing, thereby producing strong adhesion. Component A is usually epoxy resin, which is a high molecular compound containing epoxy groups. It has good chemical stability, mechanical properties and bonding properties. Its molecular structure contains multiple epoxy groups, which can react with other compounds. For example, common bisphenol A type epoxy resin is formed by condensation of bisphenol A and epichlorohydrin, and this epoxy resin provides the main bonding basis in AB glue. Component B is mainly a curing agent, and there are many types of curing agents. Common ones include amine curing agents, such as ethylenediamine, diethylenetriamine, etc. The role of the curing agent is to cross-link with the epoxy resin in component A. For example, taking ethylenediamine as an example, it contains active amino groups, which can open and connect with the epoxy groups in the epoxy resin to form a three-dimensional network structure, thereby converting the glue 400 from a liquid state to a solid state, and greatly improving the strength of the glue 400.
[0024] In one embodiment, bonding the two gasket strips to the substrate at intervals includes: bonding the gasket strips to the substrate by double-sided adhesive;
[0025] And / or, the step of sticking the release film to a side of the substrate away from the two cushion strips comprises: bonding the release film to the substrate by means of a double-sided adhesive.
[0026] In one embodiment, the substrate and the film are both long strip structures, the width of the substrate is greater than the width of the film, and the length of the substrate is less than the length of the film.
[0027] In one embodiment, curing the glue includes: performing a thermal curing treatment on the glue.
[0028] In one embodiment, the substrate is made of glass. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.
[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0031] Figure 1 It is a schematic diagram of the connection structure between two cushion strips and a substrate shown in an embodiment of the present application.
[0032] Figure 2 It is a schematic diagram of the connection structure of a release film, two pads and a substrate shown in an embodiment of the present application.
[0033] Figure 3 This is a schematic diagram of the connection structure of a release film, glue, two pads and a substrate shown in an embodiment of the present application.
[0034] Figure 4 This is a schematic diagram of the connection structure of a release film, glue, two pads, a substrate and a PET film shown in an embodiment of the present application.
[0035] Figure 5 Schematic diagram of the connection structure of the test strip shown in one embodiment of the present application.
[0036] Figure 6 This is a flow chart of a film peeling force testing method shown in one embodiment of the present application.
[0037] Description of reference numerals:
[0038] 100, pad strip; 200, substrate; 300, release film; 400, glue; 500, PET film; 600, film. DETAILED DESCRIPTION
[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0040] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0041] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0042] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0043] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.
[0045] The information and digital age has brought about the rapid development of electronic technology. Smart phones, computers and other color electronic display devices are increasingly used in life. However, some products will have bubbles and cracks during use. These problems will bring serious problems to display manufacturers. In order to ensure the function of the adhesive, peel force testing is a common part of the adhesive technology field before the product leaves the factory, and peel force has become an important indicator for dividing adhesive grades and application occasions.
[0046] In the related art, the method for testing the peel strength of wet glue is to adopt a cross-pulling method. Since the film is a non-rigid material, the cross-pulling test method will cause the film to bend and deform during the test, affecting the test result of the peel strength.
[0047] In order to solve the above problems, the embodiment of the present application relates to a film peeling force testing method, comprising the following steps:
[0048] See also Figure 1 and Figure 6 S1. Adhere two gasket strips 100 to the substrate 200 at intervals, and extend the two gasket strips 100 out of the substrate 200. Specifically, the substrate 200 has a first surface and a second surface that are arranged opposite to each other, and the two gasket strips 100 are adhered to the first surface. It should be noted that the thickness of the gasket strips 100 and the spacing between the two gasket strips 100 are not limited in this application and can be set according to needs.
[0049] In one embodiment, one end of the cushion strip 100 is extended out of the substrate 200, and the other end of the cushion strip 100 is located on the substrate 200. In another embodiment, both ends of the cushion strip 100 are extended out of the substrate 200, and the length of one end of the cushion strip 100 extending out of the substrate 200 is less than the length of the other end of the cushion strip 100 extending out of the substrate 200.
[0050] See also Figure 2 and Figure 6S2, affix the release film 300 to the side of the substrate 200 away from the two pads 100, and make the release film 300 partially extend out of the substrate 200, and affix the two pads 100 extending out of the substrate 200 to the release film 300 extending out of the substrate 200, and form a filling space between the two pads 100, the substrate 200 and the release film 300. Specifically, the release film 300 is affixed to the second surface of the substrate 200. The two pads 100 are bonded to the side of the release film 300 close to the substrate 200.
[0051] See also Figure 3 , Figure 4 and Figure 6 S3, fill the filling space with glue 400, and stick the PET film 500 on the glue 400. Due to the obstruction of the two pads 100, when the glue 400 is injected into the filling space, it is limited to flow in the filling space.
[0052] See also Figure 3 , Figure 4 , Figure 5 and Figure 6 S4, after the glue 400 is cured, a film 600 connecting the PET film 500 and the substrate 200, the PET film 500 and the release film 300 is formed, and the two pads 100 are pulled out to obtain a test sample.
[0053] S5. After the release film 300 is torn off, a 180° peeling force test is performed on the film 600 and the substrate 200 using a peeling force testing machine.
[0054] It should be noted that PET film (polyethylene terephthalate film) is a polymer film with excellent performance. The chemical name of PET is polyethylene terephthalate, which is made by polycondensation of terephthalic acid (PTA) and ethylene glycol (EG). Its molecular chain contains a rigid benzene ring structure and a flexible ethylene glycol segment. This structure makes the PET film have good toughness and strength, and can withstand a certain degree of stretching, bending and impact.
[0055] By setting the substrate 200, the substrate 200 can well fix and shape the film 600, avoid bending of the film 600 during the peeling force test, and improve the accuracy of the peeling force test result; by arranging two pads 100 on the substrate 200 at intervals, and the two pads 100 extending out of the substrate 200 are adhered to the release film 300 extending out of the substrate 200, the two pads 100 on the substrate 200 can block the glue 400 on the substrate 200, and the two pads 100 extending out of the substrate 200 can block the glue 400 on the release film 300 extending out of the substrate 200, so that The invention can be used to make the film 600, and avoid the waste of glue 400 caused by the glue 400 flowing out of the filling space, thereby reducing the production cost; by pasting the PET film 500 on the glue 400, the cured film 600 can be firmly pasted on the PET film 500, and the setting of the PET film 500 and the release film 300 prevents the test sample from adhering to other objects before the peeling force test, thereby affecting the accuracy of the peeling force test result. The release film 300 can be torn off before the test, and the film 600 and the substrate 200 can be subjected to a 180° peeling force test by a peeling force tester to ensure the accuracy of the peeling force test result. The present application can greatly reduce the problem of bending and deformation of the film 600 by testing the wet glue in a 180° peeling force test, and further ensure the peeling force test result.
[0056] See also Figure 3 , Figure 4 and Figure 5 According to some embodiments of the present application, optionally, the step of testing the peeling force between the film 600 and the substrate 200 by a peeling force testing machine includes:
[0057] S501, the ends of the film 600 and the PET film 500 away from the substrate 200 are free ends, and the end of the substrate 200 close to the free end is a clamping end. In a specific configuration, in an embodiment where one end of the cushion strip 100 is extended out of the substrate 200 and the other end of the cushion strip 100 is located on the substrate 200, the ends of the film 600 and the PET film 500 away from the substrate 200 are free ends.
[0058] In an embodiment where both ends of the cushion strip 100 extend out of the substrate 200, and the length of one end of the cushion strip 100 extending out of the substrate 200 is less than the length of the other end of the cushion strip 100 extending out of the substrate 200, that is, the end of the film 600 and the PET film 500 connected to the other end of the cushion strip 100 is a free end.
[0059] The clamping end is fixed by a first clamp of the peeling force tester, and the free end is fixed by a second clamp of the peeling force tester, wherein the first clamp is arranged opposite to the second clamp, and more specifically, the first clamp is located above the second clamp.
[0060] S502, applying a force to the first clamp to move the first clamp in a direction away from the second clamp to peel the film 600 from the substrate 200, thereby obtaining a peeling force of the film 600. The peeling force of the film 600 can be obtained according to the magnitude of the force applied to the first clamp.
[0061] See also Figure 3 , Figure 4 and Figure 5 According to some embodiments of the present application, optionally, before the two cushion strips 100 are pulled out, the following step is further included: trimming the PET film 500 and the release film 300 so that the PET film 500 and the release film 300 are adapted to the shape of the film 600. Specifically, the PET film 500 and the release film 300 are trimmed with scissors during trimming, and the sizes of the trimmed PET film 500 and the release film 300 are similar to the size of the film 600.
[0062] It should be noted that: in order to facilitate the lamination of the PET film 500 and the release film 300, the length of the PET film 500 and the release film 300 is greater than the length of the film 600, and the width of the PET film 500 and the release film 300 is greater than the width of the film 600. Therefore, after the film 600 is cured, the PET film 500 and the release film 300 need to be trimmed.
[0063] See also Figure 3 , Figure 4 and Figure 5 According to some embodiments of the present application, optionally, the step of filling the glue 400 in the filling space includes:
[0064] S301, inject glue 400 into the filling space. In a specific configuration, the glue 400 is poured into the filling space in an S-shaped curve, so that the flowing glue 400 can be quickly filled into the filling space.
[0065] S302, let the glue 400 stand for a set time, and after the glue 400 is naturally leveled, use a scraper to scrape the glue 400 flat. In the specific setting, use the two sides of the scraper to press against the pad 100, and gently slide from the top to the bottom to make the glue 400 fully flat. It should be noted that this application does not limit the standing time of the glue 400, and it can be set according to the use requirements.
[0066] See also Figure 3 , Figure 4 and Figure 5 According to some embodiments of the present application, optionally, the glue 400 is AB glue. It should be noted that the AB glue needs to be mixed before being injected into the filling space.
[0067] It is also necessary to explain that AB glue is a two-component adhesive, which consists of component A and component B. These two components will react chemically after mixing, thus producing strong adhesion.
[0068] Component A is usually an epoxy resin, which is a high molecular compound containing epoxy groups. It has good chemical stability, mechanical properties and bonding properties. Its molecular structure contains multiple epoxy groups, which can react with other compounds. For example, the common bisphenol A type epoxy resin is formed by the polycondensation of bisphenol A and epichlorohydrin. This epoxy resin provides the main bonding basis in AB glue.
[0069] Component B is mainly a curing agent, and there are many types of curing agents, and common ones are amine curing agents, such as ethylenediamine, diethylenetriamine, etc. The function of the curing agent is to undergo a cross-linking reaction with the epoxy resin in component A. For example, taking ethylenediamine as an example, it contains active amino groups, which can open and connect with the epoxy groups in the epoxy resin to form a three-dimensional network structure, thereby transforming the glue 400 from a liquid state to a solid state, and greatly improving the strength of the glue 400.
[0070] See also Figure 1 , Figure 2 and Figure 3 According to some embodiments of the present application, optionally, the two gasket strips 100 are bonded to the substrate 200 at intervals, including: bonding the gasket strips 100 to the substrate 200 through double-sided adhesive tape. The release film is bonded to the side of the substrate away from the two gasket strips, including: bonding the release film 300 to the substrate 200 through double-sided adhesive tape. The two gasket strips 100 extending out of the substrate 200 are bonded to the release film 300 through double-sided adhesive tape. The gasket strips 100 and the substrate 200 can be bonded together by using double-sided adhesive tape, and the release film 300 and the substrate 200 can also be bonded together, and the gasket strips 100 and the release film 300 can also be bonded together.
[0071] See also Figure 3 , Figure 4 and Figure 5 According to some embodiments of the present application, optionally, the substrate 200 and the film 600 are both long strip structures, the width of the substrate 200 is greater than the width of the film 600, and the length of the substrate 200 is less than the length of the film 600.
[0072] In this embodiment, the length of the substrate 200 is 14.5 cm, and the width of the substrate 200 is 4.5 cm. The length of the film 600 is 25 cm, and the width of the substrate 200 is 2.5 m. Correspondingly, the distance between the two pads 100 is 2.5 m, and the length of the pads 100 is 25 cm. The length of the release film 300 is 40 cm, and the width of the release film 300 is 20 cm.
[0073] See also Figure 3 , Figure 4 and Figure 5 According to some embodiments of the present application, optionally, curing the glue 400 includes: performing a thermal curing treatment on the glue 400. In a specific setting, the substrate 200, the film 600, the release film 300, the PET film 500 and the uncured glue 400 can be placed in an oven for baking. It should be noted that: the present application does not specifically limit the baking temperature and baking time of the substrate 200, the film 600, the release film 300, the PET film 500 and the uncured glue 400, and can be set according to actual use requirements.
[0074] See also Figure 3 , Figure 4 and Figure 5 According to some embodiments of the present application, optionally, the material of the substrate 200 includes glass. The present application does not specifically limit the material of the glass, and it can be selected according to actual use requirements. For example, the substrate 200 uses float glass. On the one hand, the hardness of float glass is moderate. The use of float glass as the substrate 200 can play a good role in fixing and shaping the film 600. On the other hand, float glass is easy to obtain and process and has a low cost.
[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0076] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A film peeling force testing method, characterized in that: include: Adhere two gasket strips to the substrate at intervals, and make the two gasket strips extend out of the substrate; A release film is attached to a side of the substrate away from the two cushion strips, and the release film is partially extended out of the substrate. The two cushion strips extending out of the substrate are attached to the release film extending out of the substrate, and a filling space is formed between the two cushion strips, the substrate and the release film. Filling the filling space with glue and pasting the PET film on the glue; The glue is cured to form a film connecting the PET film and the substrate, the PET film and the release film, and the two cushion strips are pulled out to obtain a test strip; The release film is torn off, and a 180° peeling force test is performed on the film and the substrate using a peeling force testing machine.
2. The film peeling force testing method according to claim 1, characterized in that: The step of testing the peeling force between the film and the substrate by a peeling force testing machine comprises: The end of the film and the PET film away from the substrate is a free end, and the end of the substrate close to the free end is a clamping end; the first clamp of the peeling force tester is operated to fix the clamping end, and the second clamp of the peeling force tester is operated to fix the free end; wherein the first clamp is arranged opposite to the second clamp; A force is applied to the first clamp to move the first clamp in a direction away from the second clamp, so as to peel the film from the substrate and obtain the peeling force of the film.
3. The film peeling force testing method according to claim 1, characterized in that: Before the two cushion strips are pulled out, the method further comprises the following steps: The PET film and the release film are trimmed to make the PET film and the release film match the shape of the film.
4. The film peeling force testing method according to claim 1, characterized in that: The step of filling the glue into the filling space comprises: injecting the glue into the filling space; Let it stand for a set time, and after the glue flows naturally, use a scraper to scrape the glue flat.
5. The film peeling force testing method according to claim 4, characterized in that: The step of injecting the glue into the filling space comprises: The glue is injected into the filling space in an S-shaped curve.
6. The film peeling force testing method according to claim 1, characterized in that: The glue is AB glue.
7. The film peeling force testing method according to claim 1, characterized in that: The step of bonding the two gasket strips to the substrate at intervals comprises: bonding the gasket strips to the substrate by means of double-sided adhesive tape; And / or, the step of sticking the release film to a side of the substrate away from the two cushion strips comprises: bonding the release film to the substrate by means of a double-sided adhesive.
8. The film peeling force testing method according to claim 1, characterized in that: The substrate and the film are both long strip structures, the width of the substrate is greater than the width of the film, and the length of the substrate is less than the length of the film.
9. The film peeling force testing method according to claim 1, characterized in that: Curing the glue includes: performing a heat curing treatment on the glue.
10. The film peeling force testing method according to claim 1, characterized in that: The material of the substrate includes glass.