A gold embryo based flocking processing technology

Abstract

The application discloses a kind of based on gold embryo's flocking processing technology, specifically including the following steps: fine carving copper plate: according to product drawing engraving metal original copper mould, polishing edge angle, making forming reference master copy;Wax injection, wax repair: copper plate is copied silica gel mould, inject liquid wax cooling and demoulding to obtain wax embryo, manually remove wax mould burrs, bubbles, texturing defects, ensure that wax embryo profile is complete;Alloy embryo electroforming: the wax embryo that completes wax repair is sprayed with conductive silver oil, is placed into gold electrocasting groove and is electrocast, and hollow gold alloy embryo is obtained by de-waxing, and electrolyte residue is removed by washing with clean water.The present application relates to the technical field of flocking composite processing, and the technical scheme of the present application covers the whole process of gold jewelry flocking goods, fills the fine carving copper plate, wax injection and repair, electrocasting, sand blasting, wax spraying, polishing, weighing and typing printing, steam wax removal, full set of precious metal pretreatment of metal baking finish, which is missing in traditional flocking process, to realize integrated assembly line production from mold development to flocking finished product.

Description

Technical Field

[0001] This invention relates to the field of flocking composite processing technology, specifically a flocking process based on a gold embryo. Background Technology

[0002] Chinese patent publication number CN114892421A discloses a production process based on flocking on a membrane and its application. Its advantages include PU isolation film, high voltage electrostatic, high temperature curing, and waterproof and breathable properties. However, the substrate is only nylon elastic cloth, and there are no special processes for metal workpieces such as precious metal electroforming, metal surface primer painting, steam dewaxing, and polishing. The single high temperature drying directly affects the gold blank, which will cause the gold plating to oxidize and lose its luster. There is a lack of a low temperature pre-drying and anti-oxidation cleaning system suitable for precious metals.

[0003] Traditional gold jewelry flocking only completes the flocking process separately, without integrating a complete production line from copper plate mold making, wax injection, electroforming to flocking and warehousing; the gold blank surface is smooth without sandblasting and baking paint transition layers, making the flocking adhesive extremely easy to peel off; residual electrolyte and protective wax after electroforming are not thoroughly removed by steam, resulting in large-area flocking loss after flocking; there is no gradient temperature control drying, and high temperature direct baking of the gold blank causes discoloration; finished products lack a dedicated non-bleaching cleaning solution, and long-term storage leads to dust accumulation, metal corrosion, and a short product lifespan.

[0004] Therefore, this invention provides a flocking process based on gold embryos. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, this invention proposes a flocking process based on gold blanks, which solves the technical defects of poor adhesion of gold blanks, oxidation and blackening, gold and flock loss, easy dust accumulation, and paint peeling.

[0006] To solve the above-mentioned technical problems, the basic technical solution proposed by this invention is: a flocking process based on a gold embryo, specifically including the following steps:

[0007] Step 1: Fine carving of copper plate: Carve the original metal copper mold according to the product drawings, polish the texture and edges, and make the forming reference master plate;

[0008] Step 2: Wax Injection and Repair: A silicone mold is made using a copper plate, liquid wax is injected, cooled and demolded to obtain a wax blank, and the wax mold flash, air bubbles, and texture defects are manually removed to ensure the complete outline of the wax blank;

[0009] Step 3: Electroforming of alloy blanks: The wax blanks after wax trimming are sprayed with conductive silver oil, placed in a gold electroforming tank for electroforming, dewaxing to obtain hollow gold alloy blanks, and rinsed with water to remove electrolyte residue.

[0010] Step 4: Sandblasting and wax spraying: Sandblast the flocked area of ​​the gold alloy blank to form a micro-rough surface to improve adhesion, and spray a protective wax layer on the non-flocked areas for isolation.

[0011] Step 5: Polishing: Polish the glossy decorative surface that does not require flocking with a polishing roller to retain the mirror-like metallic texture. Avoid polishing the flocked areas.

[0012] Step Six: Automatic Weighing and Marking: Electroformed gold blanks are automatically weighed and sorted, and qualified products are laser-engraved with product codes, weight, and purity markings.

[0013] Step 7: Steam spraying and drying: High-temperature steam sprays the surface of the gold blank to remove sandblasting dust, grease, and protective wax residue, and then it is placed in an 80℃ oven for pre-baking for 15 minutes to completely dry it.

[0014] Step 8: Baking and priming treatment: Spray metal-specific epoxy primer onto the flocked surface of the gold blank, level at room temperature for 10 minutes, and cure at 120℃ for 20 minutes to form a transitional bonding layer.

[0015] Step 9: Closed-loop gluing: After the gold blank has cooled, fix it stably on the workbench and apply high-temperature resistant and high-adhesion water-based PU resin glue in a closed loop around the flocked area.

[0016] Step 10: Applying the backing fabric: Select a thin knitted fleece fabric and apply it smoothly to the surface of the glued body to enhance the soft and smooth feel of the finished product;

[0017] Step 11: Pre-treatment of blank body by washing: Rinse the gold blank with warm water with the lining cloth once, and soak in room temperature cool water for 10 minutes to remove weaving sizing, baking paint dust and impurities.

[0018] Step 12: Layered roller coating of composite adhesive: The washed gold blank is fed into the coating fixture, and 0.1–0.3 mm of water-soluble acrylic composite adhesive is roller coated on the outside of the PU release film.

[0019] Step Thirteen: Electrostatic flocking of gold: The gold blank is grounded to zero potential, and a high voltage electrostatic field of 35,000–45,000 volts is introduced. Pure gold-plated nylon matte flocking is applied and electrostatic flocking is carried out for 4–6 seconds. The flocking is vertically and uniformly adsorbed onto the adhesive layer; the flocking length is 2–6 mm and the fineness is 1–1.5 D.

[0020] Step Fourteen: Gradient Segmented Drying and Curing: The first stage is low-temperature pre-drying at 30–50℃ for 30 minutes to slowly evaporate moisture, followed by natural sun drying for 10–15 minutes; the second stage is high-temperature curing at 155–165℃, with uniform conveying to complete the deep cross-linking of the adhesive layer.

[0021] Step 15: Mechanical brushing and removal of loose fibers: After curing, use mechanical brushing on both sides to continuously blow and suck away loose fibers for 0.5–1 hour to thoroughly remove unbonded and loose gold fibers.

[0022] Step 16: Gold flocking special stain removal and cleaning: Prepare 95wt% hot water and add 5wt% unbleached neutral soap detergent. Use a soft cloth to apply the solution and gently rub the stain from the inside out. Let it air dry naturally in the shade. Wipe with organic solvents to prevent the gold blank from oxidizing and the paint layer from peeling off.

[0023] Step 17: Finished product inspection, weighing, and sealed storage: Manually re-inspect the flocking uniformity, gold loss, paint layer cracking, and gold blank defects, weigh and grade again, wrap in a sealed protective film, and store in a room temperature warehouse.

[0024] Preferably, the water-soluble acrylic composite adhesive is compounded from methyl carboxyacrylate and isobutyl acrylate in a weight ratio of 1:(5–9), with the addition of a peroxide initiator, hindered phenol, and phosphite as an antioxidant, and has a viscosity of 15,000–30,000 mPa·s at 20°C; the antioxidant component has a weight ratio of 1:(2–3).

[0025] Preferably, step four, sandblasting to form a micro-uneven structure, and step eight, epoxy baking paint base coat, both enhance the bonding force between the adhesive layer and the gold metal blank, preventing flocking from falling off or peeling off after long-term use.

[0026] Preferably, step fourteen involves a two-stage gradient drying process: low-temperature pre-drying isolates the material from sudden thermal oxidation, while high-temperature curing strengthens the cross-linking of the adhesive layer, thus balancing the prevention of discoloration of the gold blank with the adhesion of the fluff.

[0027] Preferably, the water-based PU resin adhesive described in step nine is water-resistant, scrub-resistant, has adjustable hardness, and high bonding strength.

[0028] Preferably, the PU isolation film has a thickness of 0.012–0.035 mm and a dot-application spacing of 0.6–0.8 mm to prevent gold metal ions from corroding the adhesive layer.

[0029] The beneficial effects of this invention are:

[0030] The technical solution of this invention covers the entire process of flocked gold jewelry, filling the gaps in traditional flocking techniques such as engraving copper plates, wax injection and repair, electroforming, sandblasting and wax spraying, polishing, weighing and marking, steam dewaxing, and metal baking paint – a complete set of precious metal pretreatments, realizing integrated production line production from mold development to finished flocked products. By sandblasting the gold blank and adding a double transition layer of epoxy baking paint, the bonding strength between the metal and the flocking adhesive is greatly improved. After ten water washes, there is no large-area flocking or base paint peeling. The finished product has both the metallic texture of precious metal and the soft flocking surface, making it suitable for mass production of high-end gold craft collectibles and jewelry gift boxes. The innovative two-stage gradient drying process, with low-temperature pre-baking to prevent oxidation and discoloration of the gold blank and high-temperature curing to strengthen adhesion, solves the dual pain points of blackening of precious metals by single high-temperature baking and insufficient cross-linking of single low-temperature adhesive layer, which easily leads to flocking. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a flowchart of a flocking process based on gold embryos. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This application provides a flocking process based on gold embryos, which solves the technical defects of poor adhesion, oxidation and blackening, gold and flock loss, easy dust accumulation, and paint peeling of gold embryos.

[0035] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0036] According to the appendix Figure 1 As shown, the purpose of this invention is to completely integrate the flocking process into jewelry products, and to solve the technical defects of poor adhesion of gold blanks during flocking, oxidation and blackening, gold and flock falling off, easy dust accumulation, and paint peeling.

[0037] To achieve the above objectives, the complete process steps of this invention are as follows:

[0038] Finely carved copper plate: Based on the product's 3D drawings, a finely carved brass original plate is made, with the relief patterns and edges meticulously polished and burrs removed, serving as the reference master plate for batch molding.

[0039] Wax injection and wax repair: The copper plate is placed into the vulcanized silicone mold, molten paraffin wax is injected under pressure, and the mold is cooled and demolded to obtain a batch of wax blanks; the wax mold parting lines, air bubbles and imperfections are manually removed with a blade and a soldering iron to ensure the accurate shape of the wax blanks.

[0040] Electroforming of alloy blanks: Conductive silver oil is evenly sprayed onto the surface of the wax blank after wax trimming, and it is placed in a 24K gold electroforming electrolyte bath. Electroforming is completed by controlling the current density. The internal wax core is removed by hot water to obtain a hollow gold alloy blank. Multiple rinses with clean water are used to remove surface electrolyte residue.

[0041] Sandblasting and wax spraying: Glass beads are used to evenly sand the flocked areas of the gold blank, forming a micron-level rough micro-surface to improve the adhesion of the adhesive; liquid protective wax is sprayed on the non-flocked glossy areas to avoid sandblasting damaging the mirror effect.

[0042] Polishing process: Use a polishing roller to roll and polish the unwaxed decorative surface to obtain a high-gloss metallic mirror finish. The flocked and sandblasted areas are masked and do not participate in the polishing process.

[0043] Automatic weighing and marking: Electroformed gold blanks are fed into automatic weighing and sorting equipment and graded by weight; qualified products are marked with the purity of gold, product number and production batch by laser marking machine on the side of the blank.

[0044] Steam spraying and drying: 100℃ high-temperature saturated steam sprays the entire gold blank to dissolve and remove protective wax, sandblasting dust, and residual oil from electroforming; after spraying, it is sent to an 80℃ hot air oven to bake for 15 minutes to completely dry the surface moisture and prevent blistering during subsequent paint baking.

[0045] Baking paint primer treatment: Use electrostatic spraying equipment to spray metallic epoxy primer on the flocked surface of gold blank, allow it to level naturally at room temperature for 10 minutes, and cure it in a 120℃ oven for 20 minutes to form a transitional bonding layer between the metal and the flocking adhesive, which greatly improves the adhesion of the adhesive layer.

[0046] Closed-loop adhesive application: The cooled painted gold blank is stably fixed on the tooling workbench, and high-temperature resistant, high-adhesion water-based PU resin adhesive is applied continuously in a closed loop along the edge of the flocked area; the PU adhesive is temperature resistant, scrub resistant, does not shed lint, and has high bonding strength, providing basic protection for the gold blank.

[0047] Fabric backing: A thin knitted fleece is flatly attached to the surface of the glued body to optimize the feel of the finished product and weaken the cold and hard touch of metal;

[0048] Pre-treatment of blank body by washing: The gold blank with lining is first rinsed in 40℃ warm water, and then soaked in room temperature cool water for 10 minutes to remove weaving sizing, paint dust and metal debris.

[0049] PU film spot application and layered adhesive coating: Apply a 0.012–0.035mm thick PU white film between the backing and the adhesive layer, with a spacing of 0.6–0.8mm between adjacent spots; roll-coat a 0.1–0.3mm thick water-soluble acrylic composite adhesive on the outside of the PU film; the PU film acts as an isolation layer to prevent gold metal ions from corroding the adhesive layer, while retaining the cushioning feel of the substrate.

[0050] Electrostatic flocking for gold: The gold blank is grounded to zero potential, and a high voltage electrostatic field of 35,000–45,000 volts is applied for 4–6 seconds. Pure gold-plated nylon matte flocking is then applied, and the flocking is vertically oriented and adsorbed onto the adhesive layer, resulting in a three-dimensional, uniform flocking without any gaps.

[0051] Gradient-segment drying and curing: The first stage is pre-drying at a low temperature of 30–50℃ for 30 minutes to slowly evaporate moisture and prevent the gold blank from oxidizing and turning black due to sudden heat; after pre-drying, it is air-dried outdoors in natural light for 10–15 minutes to release internal moisture; the second stage is curing in a high temperature oven at 155–165℃ with a conveying speed of 12m / min to complete the deep cross-linking of the acrylic adhesive and improve the adhesion of the fluff.

[0052] Mechanical brushing and removal of loose lint: After drying and cooling, the brushes are applied in both directions, and a negative pressure fan is used to continuously remove loose lint for 0.5–1 hours, thoroughly removing any unbonded and loose gold lint and preventing the gold powder from falling off during later use.

[0053] Special gentle stain removal and cleaning: Prepare a solution of 95wt% hot water and 5wt% unbleached neutral soap cleaner. Apply the solution to a soft cloth and gently rub the stain from the inside out. Allow to air dry naturally. Do not use a hairdryer or high-temperature baking method, or wipe with organic solvents such as acetone to prevent gold oxidation and peeling of the primer.

[0054] Finished product inspection and weighing, sealed storage: manual visual inspection for flocking leakage, flocking loss, scratches on gold blanks, and paint cracks; secondary automatic weighing and grading; individual wrapping with protective film, stacking and sealing according to specifications, and storage in a normal temperature warehouse away from light to extend the shelf life of finished products.

[0055] The water-soluble acrylic composite adhesive is made of methyl carboxyacrylate and isobutyl acrylate in a ratio of 1:(5–9), with the addition of potassium persulfate initiator, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris[2,4-di-tert-butylphenyl] phosphite as antioxidants, with an antioxidant weight ratio of 1:2.5 and a viscosity of 20000 mPa.s at 20℃; the pile is made of 3mm, 1.5D pure gold-plated matte nylon pile.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A flocking process based on gold embryos, characterized in that, Specifically, the steps include the following: Step 1: Fine carving of copper plate: Carve the original metal copper mold according to the product drawings, polish the texture and edges, and make the forming reference master plate; Step 2: Wax Injection and Repair: A silicone mold is made using a copper plate, liquid wax is injected, cooled and demolded to obtain a wax blank, and the wax mold flash, air bubbles, and texture defects are manually removed to ensure the complete outline of the wax blank; Step 3: Electroforming of alloy blanks: The wax blanks after wax trimming are sprayed with conductive silver oil, placed in a gold electroforming tank for electroforming, dewaxing to obtain hollow gold alloy blanks, and rinsed with water to remove electrolyte residue. Step 4: Sandblasting and wax spraying: Sandblast the flocked area of ​​the gold alloy blank to form a micro-rough surface to improve adhesion, and spray a protective wax layer on the non-flocked areas for isolation. Step 5: Polishing: Polish the glossy decorative surface that does not require flocking with a polishing roller to retain the mirror-like metallic texture. Avoid polishing the flocked areas. Step Six: Automatic Weighing and Marking: Electroformed gold blanks are automatically weighed and sorted, and qualified products are laser-engraved with product codes, weight, and purity markings. Step 7: Steam spraying and drying: High-temperature steam sprays the surface of the gold blank to remove sandblasting dust, grease, and protective wax residue, and then it is placed in an 80℃ oven for pre-baking for 15 minutes to completely dry it. Step 8: Baking and priming treatment: Spray metal-specific epoxy primer onto the flocked surface of the gold blank, level at room temperature for 10 minutes, and cure at 120℃ for 20 minutes to form a transitional bonding layer. Step 9: Closed-loop gluing: After the gold blank has cooled, fix it stably on the workbench and apply high-temperature resistant and high-adhesion water-based PU resin glue in a closed loop around the flocked area. Step 10: Applying the backing fabric: Select a thin knitted fleece fabric and apply it smoothly to the surface of the glued body to enhance the soft and smooth feel of the finished product; Step 11: Pre-treatment of blank body by washing: Rinse the gold blank with warm water with the lining cloth once, and soak in room temperature cool water for 10 minutes to remove weaving sizing, baking paint dust and impurities. Step 12: Layered roller coating of composite adhesive: The washed gold blank is fed into the coating fixture, and 0.1–0.3 mm of water-soluble acrylic composite adhesive is roller coated on the outside of the PU release film. Step Thirteen: Electrostatic flocking of gold: The gold blank is grounded to zero potential, and a high voltage electrostatic field of 35,000–45,000 volts is introduced. Pure gold-plated nylon matte flocking is applied and electrostatic flocking is carried out for 4–6 seconds. The flocking is vertically and uniformly adsorbed onto the adhesive layer; the flocking length is 2–6 mm and the fineness is 1–1.5 D. Step Fourteen: Gradient Segmented Drying and Curing: The first stage is low-temperature pre-drying at 30–50℃ for 30 minutes to slowly evaporate moisture, followed by natural sun drying for 10–15 minutes; the second stage is high-temperature curing at 155–165℃, with uniform conveying to complete the deep cross-linking of the adhesive layer. Step 15: Mechanical brushing and removal of loose fibers: After curing, use mechanical brushing on both sides to continuously blow and suck away loose fibers for 0.5–1 hour to thoroughly remove unbonded and loose gold fibers. Step 16: Gold flocking special stain removal and cleaning: Prepare 95wt% hot water and add 5wt% unbleached neutral soap detergent. Use a soft cloth to apply the solution and gently rub the stain from the inside out. Let it air dry naturally in the shade. Wipe with organic solvents to prevent the gold blank from oxidizing and the paint layer from peeling off. Step 17: Finished product inspection, weighing, and sealed storage: Manually re-inspect the flocking uniformity, gold loss, paint layer cracking, and gold blank defects, weigh and grade again, wrap in a sealed protective film, and store in a room temperature warehouse.

2. The flocking process based on a gold embryo according to claim 1, characterized in that: The water-soluble acrylic composite adhesive is made by compounding carboxymethyl acrylate and epoxy isobutyl acrylate in a weight ratio of 1:(5–9), adding peroxide initiator, hindered phenol and phosphite compound antioxidant, with a viscosity of 15000–30000 mPa.s at 20℃; the antioxidant component weight ratio is 1:(2–3).

3. The flocking process based on a gold blank according to claim 1, characterized in that: Step four, sanding, creates a micro-uneven structure, which, together with step eight, applies epoxy paint to enhance the adhesion between the adhesive layer and the gold metal blank, preventing the flocking from peeling or flaking off after long-term use.

4. The flocking process based on a gold blank according to claim 1, characterized in that: Step Fourteen: Two-stage gradient drying, low-temperature pre-drying to isolate sudden heat oxidation, and high-temperature curing to strengthen the cross-linking of the adhesive layer, taking into account both the prevention of discoloration of the gold blank and the adhesion of the fluff.

5. The flocking process based on a gold embryo according to claim 1, characterized in that: The water-based PU resin adhesive described in step nine is water-resistant, scrub-resistant, has adjustable hardness, and high bonding strength.

6. The flocking process based on a gold embryo as described in claim 4, characterized in that: The PU isolation film has a thickness of 0.012–0.035 mm and a dot-application spacing of 0.6–0.8 mm, which isolates the adhesive layer from gold metal ions.

Images