An elastic fabric tacking pretreatment process and a semi-finished composite fabric prepared therefrom

Abstract

The application discloses an elastic fabric lamination pretreatment process, and belongs to the technical field of textile processing. The process aims to solve the problem that the inherent elasticity of elastic fabric is difficult to control in subsequent processing, leading to unstable processing and poor product quality. The process includes the following steps: providing an elastic fabric to be treated, an inelastic fabric as a temporary stabilizing layer, and a peelable adhesive; applying the peelable adhesive to one surface of the elastic fabric or the inelastic fabric; laminating the elastic fabric and the inelastic fabric through the adhesive to form a composite material; and heat setting the composite material to obtain a semi-finished product. In the semi-finished product, the elastic fabric temporarily loses elasticity and maintains a flat state under the constraint of the inelastic fabric. The application temporarily eliminates the stretch characteristics of the fabric, making it maintain dimensional stability in subsequent processing, solving quality problems such as deformation and misalignment caused by fabric elasticity, and significantly improving product quality and production efficiency.

Description

Technical Field

[0002] This invention relates to the field of textile processing technology, and in particular to a pretreatment process for bonding elastic fabrics. Background Technology

[0003] Elastic fabrics, such as those containing spandex, Lycra, and other elastic fibers, are widely used due to their excellent stretchability and comfort. However, their inherent multi-directional stretching characteristics also pose significant challenges to subsequent processing such as coating, lamination, or bonding. During processing, due to the tension of the equipment, elastic fabrics are prone to uncontrollable deformation, elongation, or shrinkage, leading to unstable material feeding and dimensional changes. This not only causes serious quality defects in the final product, such as uneven bonding, wrinkling, delamination, and dimensional deviations, but also makes it difficult to apply coatings or adhesives evenly, affecting the product's appearance and performance.

[0004] In existing technologies, some methods attempt to pre-treat elastic fabrics through steam pre-shrinking to improve their dimensional stability. However, these methods are generally limited in effectiveness and cannot completely eliminate the elastic deformation of the fabric throughout the dynamic processing. Therefore, operators still need to rely on experience to cope with frequent tension fluctuations and unstable material feed, leading to low production efficiency, high scrap rates, and significantly increased labor costs and equipment setup time. There is an urgent need for a solution that can effectively eliminate fabric elasticity before processing, allowing it to be treated stably like ordinary non-elastic fabrics. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pretreatment process for bonding elastic fabrics and a semi-finished composite fabric obtained therefrom, so as to solve the problem that in the prior art, elastic fabrics are difficult to control in subsequent processing due to their inherent elasticity, resulting in unstable processing, poor product quality and low production efficiency.

[0006] To address the aforementioned technical problems, this invention provides a pretreatment process for bonding elastic fabrics, comprising the following steps: providing an elastic fabric to be treated, an inelastic fabric as a temporary stabilizing layer, and a peelable adhesive; applying the peelable adhesive to a surface of either the elastic fabric or the inelastic fabric; bonding the elastic fabric and the inelastic fabric together using the adhesive to form a composite material; and subjecting the composite material to heat setting treatment to obtain a semi-finished product, wherein the elastic fabric temporarily loses its elasticity and remains flat under the constraint of the inelastic fabric.

[0007] Optionally, the inelastic fabric is an inelastic mesh or nonwoven fabric.

[0008] Optionally, the inelastic mesh or nonwoven fabric is made of a blend of polyester and cotton fibers.

[0009] Optionally, the peelable adhesive is a water-based acrylic adhesive or a water-based polyurethane adhesive.

[0010] Optionally, the heat setting process includes drying and setting the composite material by passing it through one or more heating rollers with a temperature set to 140°C to 170°C.

[0011] Optionally, the elastic fabric is a two-way stretch fabric or a four-way stretch fabric.

[0012] The present invention also provides a semi-finished composite fabric, comprising: an elastic fabric layer; an inelastic temporary stable fabric layer; and a peelable adhesive layer disposed between the elastic fabric layer and the inelastic temporary stable fabric layer, formed by curing an aqueous acrylic adhesive or an aqueous polyurethane adhesive, wherein the elastic fabric layer in the semi-finished composite fabric temporarily loses its elasticity and remains flat under the constraint of the inelastic temporary stable fabric layer.

[0013] Optionally, the inelastic temporary stabilizing fabric layer is an inelastic mesh layer or a nonwoven fabric layer.

[0014] Optionally, the inelastic mesh layer or nonwoven layer is made of a blend of polyester and cotton fibers.

[0015] Optionally, the elastic fabric layer is composed of a two-way elastic fabric or a four-way elastic fabric.

[0016] Compared with existing technologies, the beneficial effects of this invention are as follows: 1. Solving stability problems: By peelably attaching an inelastic temporary stabilizing layer to the elastic fabric, the stretching characteristics of the fabric are temporarily eliminated physically, allowing it to maintain dimensional stability in subsequent processing, just like ordinary non-elastic fabrics. This solves quality problems such as deformation, misalignment, wrinkling, and delamination caused by fabric elasticity. 2. Significantly improving product quality: The surface of the semi-finished product after shaping is smooth and stiff, providing an ideal processing base for subsequent coating, lamination, or printing processes. This ensures that coatings or adhesives can be evenly distributed, significantly improving the appearance quality, functional consistency, and pass rate of the final product. 3. Greatly improving production efficiency: This process "pre-stabilizes" the difficult-to-control elastic fabric, making its physical properties close to those of ordinary non-elastic fabrics, greatly reducing the difficulty of machine operation and the skill requirements for operators. This reduces downtime for debugging due to unstable material feeding and tension fluctuations, improves the operational stability of the production line and overall production efficiency, while reducing scrap rate and labor costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart of a pretreatment process for bonding elastic fabrics according to an embodiment of the present invention.

[0019] Figure 2 It is for execution according to the embodiments of the present invention. Figure 1 The diagram shows the bonding method of the process.

[0020] Figure 3 This is a schematic diagram illustrating a laminated product according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the elastic fabric state before processing in the embodiments of this application.

[0022] Figure 5 This is a schematic diagram of the semi-finished product state after processing in the embodiments of this application.

[0023] Figure 6 This is a schematic diagram of the process preparation stage in an embodiment of this application.

[0024] Figure 7 This is a schematic diagram of the feeding and gluing stages in an embodiment of this application.

[0025] Figure 8 This is a schematic diagram of the bonding and drying stages in an embodiment of this application.

[0026] Figure 9 This is a schematic diagram of the post-processing stage in an embodiment of this application.

[0027] In the attached image: 1. Elastic fabric layer; 2. Peelable adhesive layer; 3. Inelastic fabric layer; 10. Elastic fabric unwinding roller; 20. Unwinding spool for inelastic fabrics; 30. Glue tank; 31. Apply rubber rollers; 40 pressing rollers; 50 Heated drying rollers; 60 Semi-finished product reel; S101 Material Preparation; S102 Device Settings; S103 Glue Application; S104 bonding; S105 Drying and shaping; S106 Inspection and winding. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be considered as limitations on this application. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art. The terminology used in the embodiments of this application is for the purpose of describing the embodiments of this application only and is not intended to limit this application. Before further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application are explained, and the nouns and terms involved in the embodiments of this application are subject to the following interpretations.

[0029] (1) Elastic fabric: refers to fabric with high elasticity, such as fabric containing elastic fibers like spandex and Lycra. This type of fabric can significantly elongate when subjected to external stretching and return to a near-initial state after the external force is removed. In a preferred embodiment of this application, it can specifically refer to a four-way stretch fabric with elasticity in both the warp and weft directions, or a two-way stretch fabric with elasticity in only one direction. Figure 4 As shown, untreated elastic fabrics are typically soft, wrinkle easily, and have curled edges, making it difficult to maintain dimensional stability during processing.

[0030] (2) Inelastic fabric: refers to a fabric whose length and width dimensions remain basically stable and do not undergo significant elastic deformation under conventional textile processing tension. In this application, its main function is as a temporary, removable skeleton or support, i.e., a temporary stabilizing layer, to constrain the deformation of the elastic fabric during processing. In the preferred embodiment of this application, the inelastic fabric is an inelastic mesh or nonwoven fabric, such as a fabric made of a blend of polyester and cotton fibers, which has good dimensional stability and a certain degree of air permeability, which is beneficial for moisture evaporation during the subsequent heat setting process.

[0031] (3) Peelable adhesive: This refers to a special adhesive that, after curing, provides sufficient adhesive strength to temporarily bond elastic and inelastic fabrics together to form a single unit. Its key characteristic is "peelability," meaning that after subsequent processes, the composite layer can be cleanly separated through physical means (such as mechanical peeling) or specific chemical treatment without damaging the elastic fabric itself or leaving significant adhesive residue. In the preferred embodiments of this application, for example, waterborne acrylic adhesives or waterborne polyurethane adhesives combine environmental friendliness with excellent peelability.

[0032] (4) Semi-finished product: refers to an intermediate product obtained after processing using the technology provided in this application. For example... Figure 3 As shown, the semi-finished product is structurally a composite material, typically comprising an elastic fabric layer 1, a non-elastic fabric layer 3, and a peelable adhesive layer 2 bonding the two together. Its core characteristic is that, under the physical constraint of the non-elastic fabric layer 3, the original elastic fabric layer 1 temporarily loses its inherent elasticity, resulting in a flat, stiff, and dimensionally stable state. Figure 5 As shown. This state greatly facilitates subsequent precision processing such as coating, lamination, and printing.

[0033] (5) Heat setting treatment: This refers to the process of curing the peelable adhesive in the composite material by heating, and using high temperature to make the fibers in the elastic fabric reach a temporary stable state under the constraint of the inelastic fabric. This process not only evaporates the moisture or solvent in the adhesive and achieves a strong temporary bond, but more importantly, it "locks in" the state of the elastic fabric after it is flattened, thereby achieving the purpose of temporarily eliminating elasticity.

[0034] Please see Figure 1 and Figure 2 This application provides a pretreatment process and corresponding system for bonding elastic fabrics, aiming to solve the technical problem in the prior art where elastic fabrics are difficult to process stably and with high quality due to their inherent elasticity. The core idea of ​​this process is to temporarily composite the elastic fabric with an inelastic temporary stabilizing layer through a "pseudo-bonding" method, thereby enabling the elastic fabric to exhibit stable characteristics similar to inelastic fabrics during subsequent processing. The process first performs the material provision step S101, which prepares the elastic fabric to be processed, the inelastic fabric as the temporary stabilizing layer, and a peelable adhesive. This step is the foundation of the entire process, ensuring that all the basic elements required to achieve temporary bonding are in place. Its design aims to define the technical path to solve the problem from the source, that is, without changing the elastic fabric itself, but by introducing auxiliary materials to temporarily change its physical properties.

[0035] Optionally, after step S101, the equipment setup step S102 is performed. This step includes installing the elastic and inelastic fabric rolls to be processed onto the corresponding unwinding shafts 10 and 20, respectively, and passing the fabric ends through the guide rollers, gluing device, pressing roller 40, and heating and drying roller 50 along a predetermined path, finally connecting them to the take-up shaft 60. Simultaneously, key parameters are preset according to process requirements, such as setting the temperature of the heating and drying roller 50 to a predetermined value (e.g., between 140°C and 170°C), and setting the feed speed of the entire production line. This step ensures that the equipment is in the correct physical configuration and parameter settings before startup, which is a prerequisite for ensuring the continuous and stable operation of subsequent processes, thus preparing for subsequent steps such as gluing (S103).

[0036] After the materials are prepared, the process proceeds to step S103, which involves applying the adhesive. In this step, the peelable adhesive is uniformly applied to a surface of either an elastic or non-elastic fabric. The purpose of this step is to establish a controllable and removable bonding medium between the two fabric layers. By precisely controlling the amount and uniformity of the adhesive application, it is ensured that the subsequent bonding strength is moderate and uniform, effectively restraining elasticity while facilitating final peeling. This solves the problem in traditional processes where uneven adhesive application leads to excessive or insufficient localized bonding force, thus affecting product quality and peeling performance.

[0037] Next, step S104 is performed, where the surface of the fabric coated with adhesive is bonded to the surface of another fabric to form a temporary composite material. This action combines the independent elastic and inelastic fabrics into a single unit. The principle lies in utilizing the initial tack of the adhesive to fix the soft and easily deformable elastic fabric onto the flat and stable inelastic fabric, preparing it for subsequent heat setting. Through this step, the elastic fabric is initially flattened and fixed before entering the heat treatment area, preventing new wrinkles or deformations caused by tension changes in the thermal field.

[0038] Finally, the resulting composite material undergoes a heat-setting process, step S105. This step is crucial for temporarily eliminating elasticity. Under controlled temperature and tension, the composite material passes through a heating zone. The high temperature causes the peelable adhesive to cure rapidly, forming an adhesive layer 2 with a certain strength. Simultaneously, the heat releases and restructures the internal stress of the elastic fabric fibers, allowing them to be "shaped" into a flat state under the "clamping" effect of the inelastic fabric. Through this series of steps, a semi-finished product is obtained, in which the elastic fabric temporarily loses its elasticity and remains flat under the constraint of the inelastic fabric. This provides a suitable substrate for subsequent high-precision processing, significantly improving production efficiency and product qualification rate.

[0039] Furthermore, in a preferred embodiment, the inelastic fabric is an inelastic mesh or nonwoven fabric. Choosing these two materials as a temporary stabilizing layer has unique technical advantages. The mesh has an open mesh structure with excellent air permeability, which facilitates the rapid evaporation of moisture or solvent in the adhesive during the heat setting process S105, thereby improving production efficiency and ensuring complete curing of the adhesive. Nonwoven fabric has advantages such as low production cost, uniform weight, and good strength. Both materials themselves lack elasticity, providing stable and reliable physical constraints. By using these two readily available and cost-effective materials, the problem of finding an ideal temporary stabilizing layer is solved, achieving a good balance between technical effectiveness and economy.

[0040] In another preferred embodiment, the inelastic mesh or nonwoven fabric is made of a blend of polyester and cotton fibers. For example, a blend ratio of 65% polyester and 35% cotton is used. This material selection is not arbitrary but based on their synergistic effects. Polyester fibers, with their high strength, good dimensional stability, and excellent heat resistance, provide a solid "skeleton" for the temporary stabilizing layer, ensuring that it can effectively resist tension and restrain the elastic fabric during processing. The introduction of cotton fibers improves the fabric's hydrophilicity, allowing water-based adhesives to better wet and adhere to the fabric surface, enhancing the initial bonding effect. By combining the stability of polyester with the affinity of cotton, this blended fabric, as a temporary stabilizing layer, provides both strong physical restraint and good compatibility with adhesives, thereby achieving a more reliable bonding effect.

[0041] In one optional embodiment, the peelable adhesive is either a water-based acrylic adhesive or a water-based polyurethane adhesive. The choice of these two adhesives is key to achieving the core function of "temporary adhesion, subsequent peeling" in this invention. First, both are water-based adhesives, using water as a solvent, which significantly reduces volatile organic compound (VOC) emissions compared to traditional solvent-based adhesives, making them more environmentally friendly and improving the production environment. Second, water-based acrylic adhesives are relatively inexpensive, have a wide bonding range, and their final peel force can be easily controlled by adjusting the monomer formulation. Water-based polyurethane adhesives are known for their excellent flexibility and temperature resistance; the cured film is strong and elastic, maintaining stable adhesion even under certain temperature variations, and its peel performance can also be controlled through molecular design. By selecting these two adhesives, this invention ensures effective temporary fixation while also considering environmental requirements and the convenience of subsequent cleaning and peeling, solving the technical dilemma of traditional adhesives either not adhering well or being impossible to remove.

[0042] Further, in a preferred embodiment, the heat setting treatment S105 step includes: drying and setting the composite material by passing it through one or more heated rollers 50 with a temperature set to 140°C to 170°C. Temperature is the most critical parameter in the heat setting process. Setting it within the range of 140°C to 170°C is the result of optimization through extensive experimentation and practice. If the temperature is below 140°C, the rate of moisture evaporation and adhesive cross-linking and curing will be too slow, potentially leading to incomplete drying, poor setting effect, insufficient bond strength, or even delamination in subsequent processes. If the temperature is above 170°C, it may cause irreversible thermal damage to some sensitive elastic fibers (such as spandex), causing them to lose their original elastic recovery ability, or causing the adhesive to over-cur and age, making subsequent peeling difficult. Therefore, by precisely controlling the temperature between 140°C and 170°C, the present invention can achieve the best setting effect and protect the fabric from damage while ensuring production efficiency, achieving a good balance between high-efficiency production and high-quality products.

[0043] In another preferred embodiment, the elastic fabric is a two-way stretch fabric or a four-way stretch fabric. These two types of fabrics represent the main challenges in processing with existing technologies. Two-way stretch fabrics typically exhibit high elasticity in one direction (warp or weft), while four-way stretch fabrics possess excellent stretchability in both directions. These characteristics mean that any minute tension changes during processing are amplified, leading to dimensional instability, wrinkles, and deformation. The process of this invention directly targets these two most difficult-to-process fabrics by temporarily bonding them to inelastic fabrics, fundamentally limiting their multi-directional stretching capabilities. By clearly indicating the applicable scope of this invention, it highlights that this invention solves a long-standing pain point in the industry for specific materials, and thus has strong practical significance.

[0044] Please see Figure 3 This application also provides a semi-finished composite fabric, which is both a direct product of the above-described process and an intermediate product with independent value. Structurally, this semi-finished composite fabric includes an elastic fabric layer 1, a non-elastic temporary stable fabric layer 3, and a peelable adhesive layer 2 disposed between the elastic fabric layer 1 and the non-elastic temporary stable fabric layer 3. The adhesive layer 2 is preferably formed by curing a water-based acrylic adhesive or a water-based polyurethane adhesive. This three-layer structure itself is not novel, but the core distinguishing feature of this invention lies in its specific physical state: the elastic fabric layer 1 in the semi-finished composite fabric, under the constraint of the non-elastic temporary stable fabric layer 3, temporarily loses its inherent elasticity and remains flat and stiff. It is this state of "temporarily losing elasticity" that distinguishes it from all traditional composite fabrics intended for permanent bonding, providing a suitable substrate for subsequent precision processing.

[0045] Furthermore, in a preferred embodiment, the inelastic temporary stabilizing fabric layer 3 in the semi-finished composite fabric is an inelastic mesh layer or a nonwoven fabric layer. This feature corresponds to the preferred materials in the aforementioned method, resulting in a product with better performance. Using a mesh layer facilitates heat penetration during subsequent coating or lamination if thermosetting is required, and the mesh structure may contribute to stress concentration during final peeling, making peeling easier. Using a nonwoven fabric layer offers cost advantages and uniform surface characteristics. By limiting the specific material type of the stabilizing layer in the product structure, the product's performance becomes more stable and controllable.

[0046] In another preferred embodiment, the inelastic mesh layer or nonwoven layer is made of a blend of polyester and cotton fibers. This feature further clarifies the product composition and corresponds to the optimal material scheme in the method. The stabilizing layer 3, made of polyester-cotton blended fibers, combines the dimensional stability of polyester with the good affinity of cotton fibers for water-based adhesives, allowing the peelable adhesive layer 2 to form a reliable and uniform temporary bond with the stabilizing layer 3. This ensures that the stabilizing layer effectively performs its restraining function throughout the entire lifecycle of the semi-finished product (from production to downstream processing) and does not fail prematurely due to insufficient adhesion to the adhesive.

[0047] In one optional embodiment, the elastic fabric layer 1 in the semi-finished composite fabric is composed of two-way stretch or four-way stretch fabric. This clarifies that the core functional layer of this product is designed for highly elastic fabrics. By incorporating this feature into the product, it directly defines the semi-finished product as a specialized material developed to solve the processing challenges of two-way or four-way stretch fabrics, thereby making its application areas and technological advantages more focused and prominent.

[0048] To illustrate the embodiments of the present invention in more detail, the following description will be provided in conjunction with the accompanying drawings. Figures 1 to 9 This document provides a detailed description of a complete process flow. The embodiment aims to pre-treat a soft, easily deformable four-way stretch fabric into a flat, stiff, and easily coated semi-finished product.

[0049] First, such as Figure 1 Step S101 and Figure 6 As shown, prepare the materials and set up the equipment. The materials to be prepared include: a roll of 200g / m² four-way stretch polyester-spandex fabric as the elastic fabric to be treated (e.g., ...). Figure 4 (As shown in its original state), a roll of non-elastic mesh fabric of similar width, made of a blend of 65% polyester and 35% cotton, was used as a temporary stabilizing layer, along with a commercially available water-based acrylic peelable adhesive. Meanwhile, in... Figure 2The parameters on the bonding equipment are preset, with the temperature of the heating and drying roller 50 set to 150℃ and the overall material feeding speed set to 10 meters per minute. The adhesive is mixed according to the supplier's recommended ratio before use and poured into the adhesive tank 30 of the equipment.

[0050] Next, as Figure 1 Steps S103, S104 and Figure 7 , Figure 8 As shown, the gluing and bonding process is performed. A roll of four-way stretch fabric is mounted on the elastic fabric unwinding shaft 10, and a roll of non-elastic mesh fabric is mounted on the non-elastic fabric unwinding shaft 20. The equipment is started, and the non-elastic mesh fabric is drawn out from the unwinding shaft 20, its path passing through the gluing device. In the gluing device, the gluing roller 31 carries water-based acrylic adhesive from the adhesive tank 30 and evenly coats it onto the lower surface of the non-elastic mesh fabric. Simultaneously, the four-way stretch fabric is drawn out from the unwinding shaft 10. The adhesive-coated non-elastic mesh fabric and four-way stretch fabric meet at the pressing roller 40. The pressing roller 40 applies appropriate pressure, causing the two layers of fabric to adhere tightly, and the adhesive fully wets and penetrates into the surface fibers of both layers, forming a temporary composite material.

[0051] Subsequently, as Figure 1 Step S105 and Figure 8 As shown, a crucial heat-setting process is performed. The composite material exiting the pressing roller 40 is immediately guided to and wound through a large heated drying roller 50. Due to the roller surface temperature reaching 150°C, the moisture in the adhesive rapidly evaporates as the composite material passes through, and the acrylate monomers undergo a cross-linking reaction and solidify, forming a peelable adhesive layer 2 with a certain strength. During this process, the elasticity of the four-way stretch fabric is completely constrained by the rigidity of the non-elastic mesh fabric, and it is "dried and set" in a flattened state.

[0052] Finally, as Figure 1 Step S106 and Figure 9 As shown, post-processing is carried out. The fabric, after being treated by the heated drying rollers 50, has transformed from a soft material into something like... Figure 5 The semi-finished product shown is flat, stiff, and dimensionally stable. This semi-finished product is led out from the end of the equipment and sampled and tested by quality inspectors to confirm that its flatness, stiffness, and bonding strength meet the standards. After passing the inspection, the semi-finished product is guided to the semi-finished product take-up shaft 60 for winding, forming a roll for subsequent coating, lamination, or printing processes. After the entire production process is completed, components such as the glue roller 31 and glue tank 30 need to be thoroughly cleaned for future use.

[0053] As can be seen from the above embodiments, this invention, through a combination of "inelastic fabric + peelable adhesive + heat setting," temporarily transforms a difficult-to-manage elastic fabric into an easily processed "rigid" material. This transformation is physical and reversible. After downstream processes (such as precision coating) are completed, simply peeling the inelastic mesh layer 3, which serves as a temporary stabilizing layer, from the semi-finished product allows the elastic fabric layer 1 to regain its original softness and elasticity, while its surface is coated with a uniform, high-quality coating. This pretreatment process not only solves the stability problem in the processing of elastic fabrics but also greatly improves production efficiency and the quality of the final product, demonstrating significant industrial application value.

[0054] In a preferred embodiment, the process parameters of the heat setting treatment are adjusted based on the above embodiments. For example, when the elastic fabric being treated is sensitive to temperature, the temperature of the heating drying roller 50 can be reduced to 140°C, and the feed speed can be appropriately reduced to 8 meters / minute to ensure that the adhesive can be fully cured without damaging the fabric. Conversely, if the material used has good temperature resistance, in order to pursue higher production efficiency, the temperature of the heating drying roller 50 can be increased to 170°C, and the feed speed can be increased accordingly to 15 meters / minute. Practice has proven that within a wide process window of 140°C to 170°C, the present invention can achieve good setting results, demonstrating its good process adaptability and flexibility.

[0055] In another preferred embodiment, the method of applying the adhesive can also be flexibly changed. In the above embodiment, the adhesive is applied to the inelastic fabric. In another setting, the bonding equipment can also be configured to apply the adhesive directly to the elastic fabric. Specifically, after the elastic fabric is drawn from the elastic fabric unwinding spool 10, it first passes through a scraper adhesive application or spraying device to uniformly coat its upper surface with a layer of peelable adhesive, and then is bonded to the dried inelastic fabric drawn from the inelastic fabric unwinding spool 20 at the pressing roller 40. The subsequent drying and setting process is exactly the same. This method can also produce an ideal semi-finished product, proving that the core of the invention lies in forming a composite structure of "elastic fabric-adhesive-inelastic fabric" and performing heat setting, and the specific layer of fabric on which the adhesive is applied can be flexibly selected according to the specific structure of the existing equipment and process habits.

[0056] The semi-finished products prepared in this application have a wide range of applications. For example, in the field of high-end outdoor clothing and sports equipment manufacturing, it is necessary to laminate a layer of TPU waterproof and breathable membrane onto four-way stretch fabric. If laminated directly, the great elasticity of the fabric will cause the film to be stretched during the lamination process, resulting in shrinkage, wrinkling, and dimensional instability in the finished product. However, using the semi-finished product prepared by this invention as a substrate, its flat and stiff characteristics allow the TPU film to be smoothly and tension-free bonded, just like laminating with ordinary fabric. After lamination, the inelastic temporary stabilizing fabric layer 3 is peeled off, resulting in a garment fabric that retains the comfortable elasticity of four-way stretch fabric while also having good waterproof function.

[0057] For example, in the fashion industry, high-precision digital printing is required on elastic knitted fabrics. Printing directly on elastic fabrics results in distortion and deformation of the pattern due to fabric stretching and contraction, making alignment extremely difficult. However, when the semi-finished product prepared according to this invention is fed into a digital printing machine, its stable "paper-like" properties ensure that the print head can accurately spray ink droplets to the predetermined positions, obtaining a clear, non-deformable printed pattern. After the printing and color-fixing processes are completed, the temporary stabilizing layer is peeled off, and a patterned, elastic T-shirt is finished. These application scenarios fully demonstrate that this invention, as a pre-processing technology, can effectively empower downstream industries and solve common problems encountered when processing elastic fabrics.

[0058] In summary, the elastic fabric bonding pretreatment process and the semi-finished composite fabric prepared therefrom provided by the embodiments of the present invention temporarily eliminate the instability of elastic fabrics during processing by introducing a peelable, inelastic temporary stabilizing layer and combining it with a specific heat setting process. This solution is simple to operate, cost-controllable, and can significantly improve the stability of subsequent processing steps and product quality, reduce scrap rate and production costs, thus possessing high practical value. Those skilled in the art will understand that the above embodiments are merely exemplary embodiments of the present invention, and various modifications and variations can be made without departing from the spirit and scope of the present invention; all such modifications and variations fall within the protection scope of the present invention.

Claims

1. A pretreatment process for bonding elastic fabrics, characterized in that, Includes the following steps: The invention provides an elastic fabric to be treated, an inelastic fabric as a temporary stabilizing layer, and a peelable adhesive. The peelable adhesive is applied to one surface of the elastic fabric or the non-elastic fabric; The elastic fabric and the inelastic fabric are bonded together using the adhesive to form a composite material; The composite material is then subjected to heat setting treatment to obtain a semi-finished product, in which the elastic fabric temporarily loses its elasticity and remains flat under the constraint of the inelastic fabric.

2. The process according to claim 1, characterized in that, The inelastic fabric is an inelastic mesh or nonwoven fabric.

3. The process according to claim 2, characterized in that, The inelastic mesh or nonwoven fabric is made of a blend of polyester and cotton fibers.

4. The process according to claim 1, characterized in that, The peelable adhesive is a water-based acrylic adhesive or a water-based polyurethane adhesive.

5. The process according to claim 1, characterized in that, The heat setting process includes drying and setting the composite material by passing it through one or more heating rollers with a temperature set to 140°C to 170°C.

6. The process according to claim 1, characterized in that, The elastic fabric is a two-way elastic fabric or a four-way elastic fabric.

7. A semi-finished composite fabric, characterized in that, include: A layer of elastic fabric; An inelastic, temporarily stabilized fabric layer; And a peelable adhesive layer disposed between the elastic fabric layer and the inelastic temporary stable fabric layer, formed by curing a water-based acrylic adhesive or a water-based polyurethane adhesive. In this process, the elastic fabric layer in the semi-finished composite fabric temporarily loses its elasticity and remains flat under the constraint of the inelastic temporary stabilizing fabric layer.

8. The semi-finished composite fabric according to claim 7, characterized in that, The inelastic temporary stabilizing fabric layer is an inelastic mesh layer or a non-woven fabric layer.

9. The semi-finished composite fabric according to claim 8, characterized in that, The inelastic mesh or nonwoven fabric layer is made of a blend of polyester and cotton fibers.

10. The semi-finished composite fabric according to claim 7, characterized in that, The elastic fabric layer is composed of two-way elastic fabric or four-way elastic fabric.

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