KR-102962454-B1 - METHOD FOR MANUFACTURING FASHION ACCESSORIES USING DYE TRANSFER PROCESS OF WASTE PVC SHEETS AND MANUFACTURING SYSTEM THEREOF

Abstract

The present invention relates to a method for manufacturing eco-friendly fashion accessories using waste PVC sheets, and more specifically, to a technology for realizing various colors and patterns by transferring pigments contained in existing PVC sheets to new PVC sheets through a dyeing process. The core of the present invention is to wash a used PVC sheet with an alkaline cleaning solution and activate its surface through plasma treatment, then press the first PVC sheet into a mold at a temperature of 30°C to 90°C to transfer pigment to the mold, and use this mold to impart color and pattern to a second PVC sheet using a transfer dyeing method. In particular, the present invention significantly improves pigment transfer rate and color uniformity by incorporating innovative technological elements such as temperature gradient formation, stepwise pressure control, application of micro-vibrations, and color transfer promotion using surfactants. Furthermore, it simultaneously ensures production efficiency and environmental sustainability through a precision processing process combining laser cutting and an optical recognition system, along with an automatic sorting system. According to the present invention, high-quality fashion accessories can be manufactured without using separate coloring agents or chemicals, thereby achieving both environmental protection and economic efficiency, and a sustainable manufacturing system can be realized through the complete circular recycling of waste.

Inventors

• 최희수

Dates

Publication Date

20260508

Application Date

20250924

Claims (3)

1. A method for manufacturing any one of a fashion accessory, such as a bag, wallet, belt, or pouch, using waste PVC sheets, a) A step of recovering and washing the used PVC sheets; b) a step of patterning a washed first PVC sheet by pressing it against a mold at a temperature of 30°C to 90°C, wherein the pigment of the first PVC sheet is transferred to the mold during the pressing process; c) a step of transferring the pigment of the first PVC sheet to the second PVC sheet and forming a pattern by pressing the second PVC sheet using a mold on which the pigment has been transferred; d) a step of cutting the patterned second PVC sheet; and e) A step of manufacturing a fashion accessory among a bag, wallet, belt, or pouch by processing the cut second PVC sheet; Includes, A method for manufacturing fashion accessories characterized by imparting color and pattern to the second PVC sheet using only the existing pigment contained in the first PVC sheet, without using additional separate coloring agents, dyes, pigments, or inks.
2. In claim 1, a1) A step of removing adhesive residues and foreign substances attached to the surface of the used PVC sheet by immersing it in an alkaline washing solution containing sodium hydroxide or potassium hydroxide with a pH of 8.5 to 11.0 at a temperature of 40°C to 80°C for 10 to 30 minutes; a2) A step of rinsing the PVC sheet from which the adhesive residue and foreign substances have been removed with distilled water or ion-exchanged water having a pH of 6.5 to 7.5 to completely remove alkaline components; a3) a step of drying the rinsed PVC sheet with hot air at a temperature of 60°C to 80°C for 5 to 15 minutes to completely remove moisture from the surface and simultaneously weaken the pigment bonding strength inside the PVC sheet; and a4) A step of improving the pigment transfer rate in a subsequent compression process by surface activation through plasma treatment or corona discharge treatment using a voltage of 10kV to 50kV on the surface of the dried PVC sheet; A method for manufacturing fashion accessories characterized by including
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Description

Method for manufacturing fashion accessories using a dye transfer process of waste PVC sheets The following examples relate to a method for manufacturing fashion accessories using a dyeing process for waste PVC sheets. PVC (polyvinyl chloride) sheets, widely used in modern society for signboards, advertising banners, and packaging materials, are utilized for various purposes due to their excellent durability and processability. However, these PVC sheets are being discarded in large quantities due to reasons such as the expiration of their lifespan or changes in advertising content, which is causing serious environmental problems. Existing disposal methods for waste PVC sheets primarily rely on landfilling or incineration; however, environmental pollution caused by hazardous substances such as dioxins generated during PVC incineration and the shortage of landfill sites are emerging as issues. Consequently, while the need for recycling waste PVC sheets is increasing, current recycling technologies mainly consist of simple crushing followed by remolding, resulting in low added value and poor product quality. Meanwhile, the fashion accessories manufacturing sector continues to use new dyes and pigments to realize various colors and patterns, which is increasing manufacturing costs and burdening the environment. In particular, wastewater generated during the dyeing process and the use of chemicals are cited as one of the major causes of environmental pollution. Conventional waste PVC recycling technologies are primarily limited to physical reprocessing, failing to fully utilize the inherent characteristics of the raw materials. In particular, the various colored pigments contained in waste PVC sheets are often discarded as a result of mixing during the crushing process, or their utilization is significantly reduced due to the difficulty of color separation. Furthermore, existing thermal processing technologies focus solely on altering the physical properties of PVC, neglecting to consider chemical characteristics such as pigment mobility or transfer properties. Most recycling technologies developed to date are limited to the simple remolding of single materials, and research on creating new designs through pigment exchange or transfer between multiple PVC sheets of different colors or patterns is severely lacking. As a result, recycled products made from waste PVC sheets have low market competitiveness due to their monotonous appearance and limited applications, failing to achieve upcycling in the true sense. Furthermore, existing technologies often use additional chemical treatment agents or colorants during the recycling process, which poses a problem that offsets the environmental benefits of recycling. Due to these limitations, significant technical barriers currently exist for the development of high-value-added products utilizing waste PVC sheets and the realization of a complete circular economy. Hereinafter, embodiments are described in detail with reference to the attached drawings. However, various modifications may be made to the embodiments, and thus the scope of the patent application is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, and substitutions to the embodiments are included within the scope of the rights. Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified and implemented in various forms. Accordingly, the embodiments are not limited to the specific disclosed forms, and the scope of this specification includes modifications, equivalents, or substitutions that fall within the technical concept. Terms such as "first" or "second" may be used to describe various components, but these terms should be interpreted solely for the purpose of distinguishing one component from another. For example, the first component may be named the second component, and similarly, the second component may be named the first component. When it is stated that a component is "connected" to another component, it should be understood that it may be directly connected to or coupled with that other component, or that there may be other components in between. The terms used in the embodiments are for illustrative purposes only and should not be interpreted as intended to be limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally unde