TWI655075B - Manufacturing method of imitation wood and its shaped products - Google Patents

Abstract

The invention relates to a method for manufacturing imitation wood and its molded products, which are mainly made of thermoplastic elastomers. Thermoplastic Elastomer (TPE, Thermoplastic Elastomer) adjusts the temperature of the discharge die mouth before or during the conveyance of the spiral section in the screw extruder to lower the temperature of the end of the spiral section, so that the thermoplastic elastomer viscosity during the discharge process Increasing the flow velocity at the outlet slows down, causing the thermoplastic elastomer to flow back and friction in the opposite direction of the material discharge; and to produce regurgitation and friction marks; at the same time, in the process of reflow and friction, the plastic will pull along the highly elastic rubber elastomer. It breaks to form a wood fibrillar shape, and produces a woody fibrillar shape. Then, the foaming blank is extruded from the die opening; then the rotation speed of the spiral section of the screw extruder is adjusted to force the foaming blank into a molding machine to form a wood-like or wood-like molded product.

Description

Manufacturing method of imitation wood and its shaped products

The invention relates to a foamed material and a finished product thereof, and particularly to a method for manufacturing imitation wood and a molded product thereof.

Including daily necessities, furniture, car interior decoration and other items, although due to the evolution of the times and technology, a variety of materials have been produced, such as metal, plastic, ceramics, etc. However, based on the pursuit of tastes such as nature and vintage, wood has always been for many Favorite. However, due to the slow growth of wood and the consideration of environmental protection, ecology, soil and water conservation and other factors, the felling of wood is restricted by governments of various countries, so the supply has gradually converged, making prices relatively high. In addition to obtaining it at an expensive price, the industry has also developed many so-called "imitation wood" and imitation wood molding products to replace the favorite use of wood.

The aforementioned imitation wood (the same is true for its products) generally includes:

1. Adjust the wood base color by various colors of raw materials, or paint, emboss, or form wood grains on the surface of the object, but there is no substantial change in the body, only the wood grain appears on the surface of the thin object, lacking imitation wood fiber Presentation, lack of fidelity.

2. The wood grain is formed on the surface of the object as described above, and the essence is not changed, so the anti-slip effect and nailing performance are not satisfactory.

3. Due to the fact that the inside and outside are different materials, it is easy to produce deformation and desorption such as peeling and peeling paint.

In view of the prior art, the inventor believes that there should be a method for manufacturing imitation wood and its molded products, the steps include at least:

1. A screw extruder is set up, which includes a feeding hopper and a die respectively at both ends, the die is connected to a discharging die mouth, and a spiral section is formed between the feeding hopper and the die;

2. A thermoplastic elastomer (TPE, Thermoplastic Elastomer) is introduced into the spiral section from the feeding hopper; and the thermoplastic elastomer is conveyed in the spiral section.

3. Adjust the temperature of the discharge die mouth before or during the conveyance to be lower than the end temperature of the spiral section. Due to the increase in the viscosity of the thermoplastic elastomer and the decrease of the outlet flow rate during the discharge process of the discharge die mouth, the thermoplastic elasticity is reduced. The body is reflowed and rubbed in the opposite direction of the discharge; and the marks of reflow and rubbing are generated; then the foam die is extruded from the discharge die mouth;

4. Choose to adjust the speed of the spiral section of the screw extruder, forcing the foamed blank into a molding machine, the molding machine has a molding die, and the shape of the section of the molding die is cut off from the discharging die The same molding surface, and the molding die mouth is adjacent to and communicating with a molding die section with the same cross section. The foamed blank is introduced into the molding die section for flatness trimming, and one of the molding machine presets The cold bath cools the discharge.

In the present invention, a thermoplastic elastomer (TPE, Thermoplastic Elastomer) has rubber with high elasticity inside and has the characteristics of plastic. And has excellent coloring, delicate and soft touch, and the mild characteristics of wood.

The operating principle and effect of the present invention are that the temperature of the discharge die mouth is lower than the spiral section, and the viscosity of the thermoplastic elastomer in the discharge die mouth is increased due to the low temperature of the discharge die mouth, and the outlet flow rate is slowed down, and the screw The extruder continues to push the material spirally, and the extrusion process occurs under the difference in flow velocity. The material flows back and rubs in the opposite direction of the material, resulting in scratches of flow and friction. At this stage, the thermoplastic elastomer is also in the foaming process. As a result, the wrinkles of the backflow and friction are caused to flow like wood. In addition, during the process of reflow and friction, the plastic will pull and break along the highly elastic rubber elastic body to form a wood fibrous shape, and more like a wood fibrous shape.

When the thermoplastic elastomer is released from the discharge port, the foaming phenomenon is released and the extrusion is more bulky to become a foamed blank. The speed of the spiral section of the screw extruder is selected to be adjusted to force the foamed blank into a molding machine, the molding machine has a molding die, and the shape of the section of the molding die and the section of the discharging die It is the same, and the molding die mouth is adjacent to and communicates with a molding die section with the same cross section. The foamed blank is introduced into the molding die section for flatness trimming, and is cooled with a preset by the molding machine. The bath cools the discharge. The adjustment that produces the density difference of different imitation wood and its shaped products makes the material of the imitation wood and its shaped products made by the present invention have a high degree of wood simulation.

A method for manufacturing a wood-like molded product, the steps include at least:

1. A screw extruder is set up, which includes a feeding hopper and a die respectively at both ends, the die is connected to a discharging die mouth, and a spiral section is formed between the feeding hopper and the die;

2. A thermoplastic elastomer (TPE, Thermoplastic Elastomer) is introduced into the spiral section from the feeding hopper; and the thermoplastic elastomer is transported in the spiral section;

3. Adjust the temperature of the discharge die mouth before or during the conveyance to be lower than the end temperature of the spiral section. Due to the increase in the viscosity of the thermoplastic elastomer and the decrease of the outlet flow rate during the discharge process of the discharge die mouth, the thermoplastic elasticity is reduced. The backflow of the body in the opposite direction of the discharge; and the occurrence of reflow marks; and then the foam die is extruded from the discharge die mouth;

4. Choose to adjust the speed of the spiral section of the screw extruder to force the foamed blank into the cavity of an injection molding machine for a molded product. The front end of the injection molding machine for the molded product has a material storage chamber, and the capacity One end of the material chamber is in communication with the discharge die mouth, and the other end of the material chamber is in communication with a main flow channel, and the main flow channel is divided into a plurality of flow channels. Each of the secondary flow channels is provided with a gate, and the gate Communicating with corresponding mold cavities, the average width of the inner diameter of the main flow channel is not less than 12 mm, and the average width of the inner diameter of the gate and the secondary flow channel is not less than 6 mm.

5. Imitation wood molding products are produced after dry-solid demolding.

(1) ‧‧‧Screw Extruder

(A) ‧‧‧thermoplastic elastomer

(11) ‧‧‧Feeding hopper

(12) ‧‧‧Die head

(121) ‧‧‧Discharge die opening

(13) ‧‧‧spiral

(131) ‧‧‧ Subparagraph 1

(132) ‧‧‧second

(133) ‧‧‧th third

(134) ‧‧‧subparagraph 4

(2) ‧‧‧forming machine

(2A) ‧‧‧ Injection Molding Machine

(21) ‧‧‧Forming die

(21A) ‧‧‧Capacity Room

(22) ‧‧‧Forming mold section

(23) ‧‧‧Cold bath

(3) ‧‧‧ Mainstream

(31) ‧‧‧times

(311) ‧‧‧Gate

(4) ‧‧‧moulding

(5) ‧‧‧Shaped Products

The first diagram is a flowchart of the present invention.

The second figure is a schematic diagram of the system of the present invention.

The third figure is a flowchart of a molded product of the present invention.

The fourth figure is a schematic diagram of the system of the molded product of the present invention.

The fifth figure is a perspective view of a molded product of the present invention.

The following describes the technical content, features, and embodiments of the present invention with the aid of drawings, so that your trial can have a better understanding of the case.

Please refer to the first figure and cooperate with the second figure. The steps of the present invention include:

1. Set up a screw extruder (1), which includes a feed hopper (11) and a die (12) at both ends, the die (12) is connected to a discharge die (121), and the feed hopper (11) ) And the die (12) is a spiral segment (13). It must be noted that the cross section of the embodiment of the die (12) is usually smaller than the cross section of the internal cavity of the screw extruder (1), so that it can provide better pressure storage foaming time, and the screw extruder (1) The screw rotation speed can be adjusted from 100 ~ 400 / min to the foaming time and foaming degree (product density after molding), and the screw extruder (1) can be set as a single screw or a twin screw as required by the degree of mixing. . And the inside of the spiral segment (13) can be divided and defined as plural segments with different temperatures, such as the first segment (131), the second segment (132), the third segment (133), and the fourth segment. Paragraph (134).

2. The thermoplastic elastomer (A) is fed into the spiral section (13) from the feeding hopper (11), and the thermoplastic elastomer (A) is transported toward the die head (12) in the spiral section (13). In this process, the individual temperatures of the first section (131), the second section (132), the third section (133), and the fourth section (134) can be adjusted appropriately, for example:

The temperature of the first segment (131) (120 ° C ~ 140 ° C).

The temperature of the second segment (132) (135 ° C ~ 150 ° C).

The temperature of the third segment (133) (145 ° C ~ 160 ° C).

The temperature of the fourth segment (134) (155 ° C ~ 165 ° C).

In addition, the temperature of the die (12) (150 ° C ~ 165 ° C) creates more flow velocity differences and produces richer disturbance patterns. It must be noted that because there are many types and textures of wood and there are no certain specifications, the so-called "moderate adjustment" and "richer disturbing texture" are not unclear descriptions, but are made according to the complexity of the texture required by the customer , Such as the so-called "mountain pattern", "bark pattern", and so on.

3. Adjust the temperature of the outlet die (121) lower than the end temperature of the spiral section (13) before or during transportation. Taking the foregoing as an example, the end of the spiral section (13) is the fourth section (134 ), The temperature of the die opening (121) is (95 ° C ~ 140 ° C), and the temperature of the die opening (121) is lower than the end of the spiral section (13) as the temperature of the fourth section (134) ( 155 ° C ~ 165 ° C), because the thermoplastic elastomer (A) viscosity increases and the outlet flow rate slows down due to the discharge process at the discharge die (121), so that the thermoplastic elastomer (A) flows back to the opposite direction of the discharge And friction; and the marks of reflow and friction. This foaming phenomenon is released and the extrusion is more bulky to become a foamed blank.

4. Choose to adjust the speed of the spiral section (13) of the screw extruder (1) to force the foamed blank into a molding machine (2), which has a molding die (21), the The forming die (21) is provided with a temperature (20 ° C ~ 60 ° C), and the shape of the cross section of the forming die (21) is the same as that of the discharge die (121), and the forming die (21) ) The molding die section (22) with the same cross section is adjacent and communicated. The foamed blank is introduced into the molding die section (22) for flatness trimming, and preset by the molding machine (2). One of the cold baths (23) cools the output (5 ° C to 30 ° C), and adjusts the density difference of different imitation woods, so that the imitation wood materials made by the present invention have a high degree of wood simulation.

The end of the foamed blank can optionally be slowly matched with the speed of the spiral segment (13) of the screw extruder (1) by a tractor (not shown in the figure, not necessary) to assist in dragging the foamed blank Out.

The back-end process can be as needed: a sawing table and a discharge rack are used as the finished material for cutting and placement. The vacuum pump can be used to suck the water and air from the cooling mold, which can make the wood surface as smooth as polished. The resulting wood does not require a second surface finish.

The imitation wood formed is not just the surface texture, which can be planed, cut, grinded, and sculpted. The inner layer is similar to the wood, and the sawdust can be almost unreal. Decreasing the die compression ratio can pull out the wood fibers. Controlling the feed ratio can make wood stalks. Comparison with general wood plastic production methods:

1. Generally, only close-mixed wood base colors can be blended in proportion to the raw materials of various colors. The invention can make a variety of simulated wood by using the manufacturing method.

2. Generally can only rely on subsequent painting to show the wood grain. The invention integrally forms various textures.

3. Generally only one kind of surface roughness can be made before embossing. The present invention does not require secondary processing.

4. Generally, after secondary processing, it can only be beautified on the surface and cannot make wood fibers. The imitation wood fiber of the present invention is not inferior to wood and is not tied.

5. Generally no surface anti-slip effect after processing. The present invention has more anti-slip effect when it encounters water.

6. General products will be bent due to uneven internal stress caused by secondary processing. The shrinkage of the variant of the present invention has been within 5/1000.

7. General products have lower nailing force than wood. The nailing force of the invention is stronger than that of wood and the nailing can be repeated.

According to another claim made in this case, in addition to the aforementioned method of manufacturing imitation wood, please also refer to the third and fourth diagrams. When a molded article of the imitation wood is to be made, its manufacturing method and steps include at least:

1. Set up a screw extruder (1), which includes a feed hopper (11) and a die (12) at both ends, the die (12) is connected to a discharge die (121), and the feed hopper (11) ) And the die (12) is a spiral segment (13).

2. Thermoplastic Elastomer (TPE, Thermoplastic Elastomer) (A) is put into the spiral section (13) from the feeding hopper (11); because the density of the molded products will be different in the future, it will enter the The thermoplastic elastomer (A) must be determined when it is fed into the hopper (11), that is, the smaller the density of the molded product in the future, the thermoplastic elastomer (A) must be fed into the The amount of the hopper (11) is relatively small. And the thermoplastic elastomer (A) is transported in the spiral section (13).

3. Adjust the temperature of the die opening (121) lower than the end temperature of the spiral section (13) before or during conveying. Because of the process of discharging in the die opening (121), the thermoplastic elastomer (A) The viscosity increases and the outlet flow rate slows down, causing the thermoplastic elastomer (A) to flow back in the opposite direction of the discharge; and a regurgitation mark is produced; and then the foam die is extruded from the discharge die opening (121).

4. Choose to adjust the rotation speed of the spiral section (13) of the screw extruder (1), forcing the foamed blank to enter the molding cavity (4) of an injection molding machine (2A) for molding, and the injection of the molding product The front end of the molding machine (2A) has a material storage chamber (21A), one end of the material storage chamber (21A) is in communication with the discharge die opening (121), and the other end of the material storage chamber (21A) is connected to a main channel ( 3) The main flow channel (3) is divided into a plurality of sub-flow channels (31). Each sub-flow channel (31) is provided with a gate (311), and the gate (311) communicates with each corresponding channel. The mold cavities (4) are in communication, the average width of the inner diameter of the main channel (3) is not less than 12 mm, and the average width of the inner diameter of the gate (311) is not less than 6 mm, preferably 8 mm, or even 12 mm.

5. The imitation wood shaped product (5) is produced after the drying and solid demolding (as shown in the fifth figure).

Since the molten material entering the thermoplastic elastomer (A) has a viscous property, the present invention ensures that the thermoplastic elastomer (A) can enter the cavity (4) stably and gently, and can be used in the cavity (4). The thermoplastic elastomer (A) in the inside reflows and rubs in the opposite direction of the discharge; and the marks of reflow and friction are generated, so the average width of the inner diameter of the main channel (3) must not be less than 12mm, and the gate (311 ) And the average width of the inner diameter of the secondary flow channel (31) are not less than 6mm, so that a larger moving path can be allowed to allow the thermoplastic elastomer (A) melt to enter the mold cavity (4) stably and gently. .

This case claims domestic (national) priority. At the time of the first application, a photo of the physical product is attached for reference. Because the description of "wood" often requires physical experience to assist the situation. If your trial has doubts about the products produced in this case, please inform the applicant to attach the actual goods for reference, and the applicant should cooperate with all efforts.

In summary, the present invention is indeed in line with industrial applicability, and was not seen in publications or public use before application, nor was it known to the public. It is non-obvious and easy to understand, and meets the patentable requirements. . However, what has been described above is a preferred embodiment of the present invention. For example, all equal changes made in accordance with the scope of patent application of the present invention are within the scope of this case.

Claims (4)

A wood-imitation manufacturing method, the steps at least include: 1. A screw extruder is provided, which includes a feeding hopper and a die head at both ends, the die head is connected to a discharging die mouth, and a spiral is formed between the feeding hopper and the die head. 2. Thermoplastic Elastomer (TPE, Thermoplastic Elastomer) is put into the helical section by the feeding hopper; and the thermoplastic elastomer is transported in the helical section; 3. the discharge die is adjusted before or during transportation The temperature is lower than the end temperature of the spiral section. Due to the increase in the viscosity of the thermoplastic elastomer and the decrease in the outlet flow rate during the discharging process at the exit of the spiral die, the thermoplastic elastomer reflows in the opposite direction of the discharge; ; Then extruding the foamed blank at the die opening; 4. adjusting the rotation speed of the spiral section of the screw extruder to force the foamed blank into a molding machine, the molding machine having a molding die, and the molding die The shape of the cross section of the mouth is the same as the cross section of the discharge die, and the forming die is adjacent to and communicates with a forming die section with the same cross section. The foamed blank is introduced into the forming die section for flatness. Trim and shape One of the preset cold baths cools the output, and the individual temperatures of the first, second, third, and fourth segments are adjusted as follows: the temperature of the first segment is 120 ° C ~ 140 ℃, the second segment temperature is 135 ° C ~ 150 ° C, the third segment temperature is 145 ° C ~ 160 ° C, the fourth segment temperature is 155 ° C ~ 165 ° C, the die temperature is 150 ° C ~ 165 ° C, the output The die die temperature is 95 ℃ ~ 140 ℃; the die section is smaller than the cross section of the cavity of the screw extruder, the die section is larger than the die section, and the cross-sectional shape of the die is The cross section of the discharge die is the same, so that the plastic will be pulled and broken along the highly elastic rubber elastic body during the reflow and friction processes to form a woody fibrous shape. The method for manufacturing imitation wood as described in item 1 of the scope of patent application, wherein the inside of the spiral section is divided and defined as a plurality of sections for different temperatures. A method for manufacturing imitation wood shaped products, the steps include at least: 1. A screw extruder is provided, and the two ends respectively include a feeding hopper and a die head, the die head is connected with a discharging die mouth, and the feeding hopper and the die head It is a spiral segment; 2. A thermoplastic elastomer (TPE, Thermoplastic Elastomer) is input into the spiral segment from the feeding hopper; and the thermoplastic elastomer is conveyed in the spiral segment; 3. the discharge is adjusted before or during conveyance The die temperature is lower than the end temperature of the spiral section. Due to the increase in the viscosity of the thermoplastic elastomer and the decrease in the outlet flow rate during the discharge process of the discharge die, the thermoplastic elastomer flows back in the opposite direction of the discharge; Marks; then extruding the foamed blanks at the exit of the die; 4. adjusting the rotation speed of the spiral section of the screw extruder to force the foamed blanks into the cavity of an injection molding machine for a molded product, and the molded product The front end of the injection molding machine has a material holding chamber, and one end of the material holding chamber is in communication with the discharge die mouth, and the other end of the material holding chamber is in communication with a main channel, and the main channel does not have multiple flow channels. The various The runner is provided with a gate, and the gate is in communication with the corresponding cavities. The average width of the inner diameter of the main channel is not less than 12mm, and the average width of the inner diameter of the gate and the secondary channel is not less than 6mm; The individual temperatures of the first, second, third, and fourth segments are: the temperature of the first segment is 120 ^{° C} to 140 ^{° C} , and the temperature of the second segment is 135 ^{° C} to 150 ^{° C.} The three-stage temperature is 145 ^℃ ~ 160 ^℃ , the fourth stage temperature is 155 ^℃ ~ 165 ^℃ , the die head temperature is 150 ^℃ ~ 165 ^℃ , and the exit die temperature is 95 ^℃ ~ 140 ^℃ ; The cross section of the inner cavity of the screw extruder is small, the cross section of the molding die is larger than the cross section of the die head, and the shape of the cross section of the molding die is the same as that of the discharge die, so that the plastic can reflow and rub. The process will pull and break along the highly elastic rubber elastic body to form a woody fibrous shape; 5. After the mold is dried and solidified, a wood-like molded product is produced. The manufacturing method of imitation wood shaped products as described in item 3 of the scope of the patent application, wherein the inside of the spiral section is divided and defined as a plurality of sections for different temperatures.