WO2010009571A1

WO2010009571A1 - Manufacture method of wooden-imitating plastic product

Info

Publication number: WO2010009571A1
Application number: PCT/CN2008/001349
Authority: WO
Inventors: 蔡哲峰; 吴素慜
Original assignee: 铭板打印装置设备(上海)有限公司
Priority date: 2008-07-21
Filing date: 2008-07-21
Publication date: 2010-01-28
Also published as: CN101896326A

Abstract

A manufacture method of wooden-imitating plastic product includes: (1) processing a desired wooden grain pattern on an injection mold; (2) injecting plastic materials into the mold; (3) spraying paint evenly onto the desired areas of the product, and then baking the product in a baking oven; (4) grinding the surface of the product with a sand paper to the extent that the paint exists in the wooden grain pattern and partial surface of the product.

Description

Method for manufacturing plastic strand product with wooden effect

Technical field

The present invention relates to a method of manufacturing a plastic product, and more particularly to a method of producing wood grain on a plastic product. Background technique

Wood is widely used in various fields of social life and production. Due to the massive deforestation of trees, environmental damage and soil erosion are caused. At the same time, the use of wood also has certain drawbacks. For example, the price of wood is relatively expensive. In addition, the wood requires a large amount of labor during the processing. The processing is complicated: the wood must be dehumidified before being sent to the workshop for processing, and then selected. Cut off the imperfect wood (corrosion part) and reduce the usage rate. After the wood enters the workshop, the woodworker uses simple mechanical tools to shape the piece of wood into a final product. After the shape of the product is formed, the wood product needs several rounds of painting and sanding to create the desired surface finish. . Therefore, depending on the complexity of the product, the production process will take hours or even days to be completed.

Due to the above-mentioned costs of wood and defects in the processing process, people have made wood grain on the plastic surface to simulate wood and made a plastic product with a wooden effect. The wood grain processing methods commonly used in plastic products are generally divided into two groups. The first set of methods uses printing to obtain wood grain decorative effects, which are generally used for the decoration of flat or two-dimensional products. Two-dimensional products include floor and furniture panels. The second set of methods not only decorates the two-dimensional product but also the surface of the three-dimensional product, thus making the set suitable for solid wood and grain-making with irregular curved parts. The second set of methods mainly includes water transfer and in-mold decoration techniques.

The water transfer technology process is as follows:

1. Pre-processing of materials (de-oiling, dust removal); 2, the upper fixture;

3, spray the bottom color (paint) or interface paint treatment;

4, baking paint or self-drying;

5. Transfer (manual or automatic): The printing method of transferring the corresponding pressure on the intermediate carrier film to the substrate, called transfer. The water transfer printing technique is a printing method in which a transfer paper/plastic film with a color pattern is subjected to macromolecular hydrolysis by water pressure. The water-transferred film with special chemical treatment is printed on the surface of the water after printing the desired color pattern, and the color pattern is uniformly transferred to the surface of the product by the action of water pressure, so that the drape film is automatically Dissolved in water, after washing and drying, and then a transparent protective coating, the product has presented a completely different visual effect;

6. Washing treatment (washing off residual film);

7, drying;

8, film filling (repair);

9, spray topcoat (protective paint);

10, baking paint (drying).

The use of water transfer technology to produce wood grain on plastic products is a mature technology, with a variety of wood grain patterns. This technology can decorate products with irregular or curved surfaces. However, this method has the following drawbacks: 1) Wood grain deformation or deterioration in print quality at the last entry point, especially in depth. 2) The process is complicated and labor intensity is high. The main labor intensity is in the transfer and film filling process. Film filling is a necessary procedure because the bubbles generated during the impregnation process can cause defects in the product and must be eliminated by filling the film. 3) Environmental pollution is caused by the use of diluents and chemicals, which is not conducive to environmental protection.

The in-mold decoration technique is a technique in which a decoratively formed and cut film is placed in a cavity of a processed mold and then injection molded. In-mold decoration technology can diversify the selection of images, and the product quality is stable. But in-mold decoration is more expensive because the technology requires one An additional film of the layer is also required to be subjected to printing treatment, molding (high pressure molding, thermoforming, metal-to-die molding) on the film, and then injection molding. In addition, the technical requirements for injection mold design, film forming and cutting are so high that only a few manufacturers with specialized capabilities can use this technology.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for producing a plastic product having a wooden effect which is simple in manufacturing process, low in cost, and has a realistic texture depth and wood feel.

In order to achieve the above object, the present invention adopts the following technical solution: A method for manufacturing a plastic product having a wooden effect, comprising the following steps:

(1) processing the required wood grain on the injection mold;

(2) Injection molding of plastic materials;

(3) Spraying the paint evenly on the part where the product needs to be sprayed, and baking the painted product into the oven;

(4) Polishing the surface of the product.

Preferably, the step (1) is to process the desired wood grain on the injection mold by means of transfer and etching.

Preferably, the transfer and etching method comprises the steps of:

(1) forming a wood grain pattern or a pattern into a film;

(2) transferring the pattern on the film to the mold;

(3) The mold is placed in a corrosive solution to soak and corrode, so that a deep grain of wood is formed on the mold.

Preferably, transferring the pattern on the film to the mold in the step (2) comprises the following steps: (1) cleaning the mold;

(2) The surface of the mold that does not need to be corroded is shielded with tape, and the small parts are shielded with anti-corrosion printing ink;

(3) spraying the photosensitive ink on the surface of the mold and drying it;

(4) attaching the film to the surface of the mold and exposing it with light;

(5) The film is removed, and the photosensitive ink which is not exposed on the mold is washed away.匪。 30. The depth of the wood grain formed on the mold is 0. 10-0. 30匪.

Preferably, the injection molding of the step (2) specifically comprises the following steps:

1), first select the plastic material and determine its physical properties, and then determine the color of the substrate of the plastic product;

2) Install the mold on the injection molding machine and put the plastic material into the drying cylinder for drying. Then set the process parameters suitable for the raw materials and the required plastic products on the injection molding machine, and obtain the machine and process parameters. Needed injection molding products;

3) Check the appearance of the product and remove it if there is a nozzle.

The injection molding process parameters in the step 2) are: setting the temperature of the mold according to the physical property parameters, the drying temperature and drying time of the raw material, the plasticizing temperature of the raw material, setting the rotation speed and back pressure of the screw according to the characteristics of the product. , Metering position, switching position, injection pressure, speed, holding pressure, time, cooling time, according to the characteristics of the mold and product to set the position of the mold opening and closing mold, speed, pressure, ejection position, pressure and speed.

Preferably, the painting of the step (3) comprises the following specific steps:

1), first determine the final color of the plastic product, then determine the color of the desired paint, and determine the physical properties of the paint;

2), shielding the position on the product that does not need to be painted;

3), use the thinner to adjust the paint according to the physical parameters of the paint, and spray the debugged paint evenly onto the product; 4), the painted product is baked in an oven;

5), remove the shielding on the product.

Preferably, the weight ratio of the paint to the diluent in the above step 3) is 1:1, the spray thickness of the spray paint is 5-25 mm, preferably 8-15 blue, the oven temperature is 50_80 ° C, and the baking time is 10- 20 minutes.

The grinding of the product in the step (4) can be carried out by manual or electric means, and the grinding material used in the grinding process can also be selected according to the needs, as long as the grinding effect to be achieved can be achieved, as an optimization. The polishing of the product mainly comprises the following steps:

1) First, select the type of sandpaper according to the surface requirements of the product and the characteristics of the paint, and then immerse the confirmed sandpaper in water;

2), evenly sanding the surface of the product with soaked sandpaper;

3), clean the product, and then pack.

Preferably, between step 2) and step 3) of the product sanding process, the following steps are further included: the polished product is cleaned and then sprayed with a high gloss paint: Thinner: The weight ratio of the curing agent is 100: 20: 52. Painted, the paint is sprayed to a thickness of 15_25um; the painted product is placed in an oven for drying. The drying conditions are set according to the physical properties of the paint. The oven temperature is 60_80 °C, and the baking time is 30-60. minute.

Compared with the prior art, the beneficial effects of the invention are:

1. The invention forms a wood grain pattern on the surface of the plastic product, so that the plastic product has a wooden effect, and the price of the plastic is lower than that of the wood, thereby reducing the cost of the product.

2. The manufacturing method of the present invention is simple, and the precision in the painting and polishing process is not high, so the operation is easy and the product qualification rate is high.

3. The invention can complete the processing process without a large amount of labor, is very suitable for mass production, saves cost, and can ensure the consistency of product quality. 4. The wood grain texture on the plastic product produced by the invention has good touch and depth. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a photograph of a plastic product having a wooden effect produced by the method of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the invention will be described in detail with reference to the preferred embodiment of the present invention, but is not intended to limit the invention. The plastic product with wooden effect shown in Figure 1 is manufactured according to the following steps: 1. The grain processing of the injection mold wood grain:

Firstly, determine the texture of the wood grain to be processed on the mold. You can select the actual wood or the wood grain on the picture or sample as the model for the mold wood grain corrosion processing. According to the condition of the wood grain surface, select the corresponding type of sandpaper to the front of the mold. The surface of the mold is polished, and finally the etch of the front mold of the mold is performed. The detailed processing technology of the work, mold corrosion processing is as follows:

1, film production

The computer scanner scans the determined wood grain pattern, takes the shape of the pattern pattern wood grain, and uses the black and white transparent image film to form a transfer film copy;

2, transfer

Firstly, the mold is cleaned, and then the surface of the mold that does not need to be corroded is shielded with tape. The small part is shielded with anti-corrosion printing ink, and the photosensitive ink is sprayed on the surface of the mold. After the photosensitive ink is dried, the film is pasted. Exposure with light (when the light is on the film, the light on the film is transparent on the film, and the light on the film is not transmitted on the black film). The film is removed, and the ink is washed. Mold The photosensitive ink that has not been irradiated is washed away, and the shape of the entire wood grain is displayed on the mold, and the transfer is completed;

3, corrosion

First, the mold is protected against corrosion, and then the mold is placed in a corroded solution that has been debugged. The etching solution may be an acid solution or an alkali solution, preferably a nitric acid solution. Immerse the mold for 10-15 minutes, and repeat it for several times until the wood grain etched on the mold reaches the required depth of 0. 10- 0. 30mm, preferably 0. 20匪- 0. 25 legs, remove the mold, clean Clean, use the stylus pen and anti-corrosion printing ink to correct the shape of the wood grain in the need of finishing, and transfer successfully. Finally, the tape used for shielding and the anti-corrosion printing ink are removed, and the mold is thoroughly cleaned.

Second, injection molding:

1. Selection and processing of plastic raw materials: Firstly, determine the color of the plastic material with wooden effect. Please match the color of the plastic raw material manufacturer and provide the color plate. After confirming that the color plate is the same as the required color, please provide the plastic material manufacturer. Raw material and physical properties;

2. Install the mold for processing the wood grain in step 1 on the injection molding machine, and put the plastic material into the drying cylinder for drying, and then set the process parameters suitable for the raw materials and products on the injection molding machine. Injection molding machines and process parameters yield the required injection molded products. The setting parameters of the injection molding process are as follows: the temperature of the mold is set according to the physical property parameters, the drying temperature of the raw material and the drying time, and the plasticizing temperature of the raw material. The rotation speed and back pressure of the screw are set according to the characteristics of the product, and the measurement is performed. Position, switching position, injection pressure, speed, holding pressure, time, cooling time. According to the characteristics of the mold and product, set the position, speed, pressure, ejection position, pressure, speed, etc. of the mold opening and closing mold. The injection molding process uses a conventional injection molding process;

3. Check the appearance of the product and remove the nozzle from the product.

1. Selection and processing of paint: First, determine the texture of plastic products with wooden effect The color of the paint inside, please paint the manufacturer's color and provide the color plate, confirm that the color plate is consistent with the required color, please provide the paint and physical parameters of the paint manufacturer;

2. Use tape to shield the product from the location where painting is not required, then wipe off the surface with oil.

3. According to the physical parameters of the paint, use the thinner to adjust the paint. The weight ratio of the paint to the thinner is 1:1, and the paint is sprayed on the product. The thickness of the sprayed paint is 5-25匪, preferably 8 -15 paintings;

4. Put the painted product into the oven for baking. (The oven temperature and baking time are set according to the physical properties of the paint.) The oven temperature is 50-80 °C, and the baking time is 10-20 minutes. ;

5. Remove the tape from the product.

Fourth, product polishing:

1. First select the sandpaper (1000#-2000#) according to the surface requirements of the product and the characteristics of the paint, and then cut the selected sandpaper into small pieces (about 30匪X 30 leg squares) and soak in the water;

2. Place the product on the working platform and use the soaked sandpaper to evenly polish the surface of the product until the surface of the product is painted in the wood grain and the surface of the product. If the product requires high gloss, the polished product should be cleaned and then sprayed with a layer of high-gloss paint: Thinner: The weight ratio of the curing agent is 100: 20: 52. The thickness of the paint is 15-25um, then put Drying in an oven, the baking temperature and baking time are set according to the physical properties of the paint, the oven temperature is 60-80 ° C, and the baking time is 30-60 minutes;

3. Clean the product and then package the product.

Claims

Rights request

1. A method of manufacturing a plastic product having a wooden effect, comprising the steps of:

(1) processing the required wood grain on the injection mold;

(2) Injection molding of plastic materials;

(4) Polishing the surface of the product.

2. The method of manufacturing a plastic product having a wooden effect according to claim 1, wherein the step (1) is to process a desired wood grain on the injection mold by means of transfer and corrosion. .

3. The method of manufacturing a plastic product having a wooden effect according to claim 2, wherein the transfer and etching method comprises the following steps:

(1) forming a wood grain pattern or a pattern into a film;

(2) transferring the pattern on the film to the mold;

(3) The mold is placed in a corrosive solution to soak and corrode, so that the mold has a depth of wood.

4. The method of manufacturing a plastic product having a wooden effect according to claim 3, wherein the step (2) of transferring the pattern on the film to the mold comprises the steps of:

(1) cleaning the mold;

(3) spraying the photosensitive ink on the surface of the mold and drying it;

(4) attaching the film to the surface of the mold and exposing it with light;

(5) The film is removed and the unexposed photosensitive ink on the mold is washed away. 1 至30. 30匪。 The wood grain having a depth of 0. 1 0-0. 30匪.

The method for manufacturing a plastic product having a wooden effect according to claim 1, wherein the injection molding of the step (2) specifically comprises the following steps:

2), install the mold on the injection molding machine, and then set the process parameters suitable for the raw materials and the required plastic products on the injection molding machine, and put the plastic raw materials into the drying bucket for drying, through the machine and the process. The parameters get the required injection molded product;

3) Check the appearance of the product and remove it if there is a nozzle.

7. The method of manufacturing a plastic product having a wooden effect according to claim 1, wherein the painting of the step (3) comprises the following specific steps:

1), first determine the final color of the plastic product, then determine the color of the paint, and determine the physical properties of the paint;

2), shielding the parts of the product that do not need to be painted;

3), use the thinner to adjust the paint according to the physical parameters of the paint, and spray the debugged paint evenly on the product;

4), the painted product is baked in an oven;

5), remove the shielding on the product.

The method for manufacturing a plastic product having a wooden effect according to claim ,, wherein the weight ratio of the paint to the diluent in the step 3) is 1:1, and the spray thickness of the spray paint is 5- 25 orchids.

9. The method of manufacturing a plastic product having a wooden effect according to claim 1, wherein the polishing of the product according to the step (4) mainly comprises the following steps:

1), first select the sand according to the surface requirements of the product and the characteristics of the paint. Paper, then cut the confirmed sandpaper into small pieces and soak it in water;

2), place the product on the working platform, and use the soaked sandpaper to evenly polish the surface of the product;

3), clean the product, and then pack.

The method for manufacturing a plastic product having a wooden effect according to claim 9, wherein the steps 2) and 3) further comprise the steps of: cleaning the polished product and then spraying one High-gloss paint: Thinner: The paint is mixed with a weight ratio of 100: 20: 52. The paint is painted at a thickness of 15-25um. The painted product is dried in an oven. The oven temperature is 60- 80 ° C, baking time 30-60 minutes.