CN1331006A - Foamed plastic board with appearance surface, its manufacturing method and use - Google Patents

Abstract

The invention relates to a foamed plastic board with appearance surface, its manufacturing method and use, mainly use the two-material co-injection molding way to inject foamed plastic material and resin into the mold cavity of the one-shot forming mold, in the co-injection process, the appearance surface layer material will flow at the periphery of the mold cavity, the foamed plastic material will flow in the core of the mold cavity, can form the outer surface of the foamed plastic layer naturally and cover the appearance surface. Therefore, the invention not only avoids the trouble of secondary processing caused by additionally sticking the appearance surface skin, but also can replace wood by plastic, thereby achieving the ecological environment-friendly requirement.

Description

Foamed plastic board with appearance surface, its manufacturing method and use

The invention relates to a foamed plastic board, in particular to a foamed plastic board with an appearance surface. The invention also relates to the manufacturing method and application of the foamed plastic board with appearance surface.

According to research, in recent years, the abnormal phenomenon of the entire environment and the deterioration of the greenhouse effect are related to the excessive abuse of forest plants. Therefore, under the consideration of environmental protection, it is impossible to rely endlessly on natural forest materials for building materials or other furniture. Instead, look for alternative materials that can replace wood.

Generally, because of its high rigidity, shock resistance, light weight, easy processing and sound insulation effects, the currently widely used alternative materials are mainly plastic materials. Although plastic materials have the advantages of lower cost and easier processing, due to the high shrinkage of plastic materials themselves, and the effect of plastic materials in terms of shock resistance or sound insulation is relatively poor, it is especially used in enclosures such as speakers or loudspeakers. It is even more difficult to integrate, so a technology that uses foamable plastic material injection molding was developed immediately, and the above-mentioned functions of sound insulation or shockproof can be achieved by the air bubbles in the interior.

However, when the foamed plastic is injection molded, there will be countless air bubbles and pores on the surface of the foamed plastic product, which is not very elegant. Therefore, secondary processing is generally required, and a wood grain skin layer or other appearance skin layer is pasted on the outer surface of the product. Procedures to increase the aesthetic effect, so as to meet the requirements of commercialization.

Please refer to Fig. 1, which is a schematic cross-sectional view of an existing imitation wood product, which mainly includes a foamed plastic layer 10 and a wood-like surface layer 14, wherein the foamed plastic layer 10 is formed by a foam injection molding technique. Made of foamed plastic material, there are many air bubbles 16 inside which can be used as shockproof or sound insulation effect, and the imitation wood surface layer 14 (or appearance skin layer) will be processed again, and a sticky adhesive layer 12 will be pasted on the hair The outer layer of the foam plastic layer 10 is so as to achieve the effect of beautifying the appearance. Although this production method can achieve the effect of beautifying the foamed plastic product, after all, it needs to add an adhesive process, which is not only inconvenient and increases the cost, but also the adhesive effect will fall off after a long time of use. .

The main purpose of the present invention is to overcome the deficiencies of the prior art and provide a foamed plastic board with a two-layer structure and an appearance surface with better adhesion. The object of the present invention is also to provide a manufacturing method and application of a foamed plastic board with an appearance surface.

Therefore, the present invention provides a foamed plastic board with an appearance surface. The foamed plastic board with an appearance surface has a double-layer structure. The foamed plastic layer of multiple air bubble chambers and an appearance skin layer covering the outer surface of the foamed plastic layer.

In the foamed plastic board with an appearance surface of the present invention, the appearance skin layer is a resin layer mixed with wood flour.

In the foamed plastic board with an appearance surface of the present invention, the appearance skin layer is a resin layer mixed with toner.

In the foamed plastic board with an appearance surface of the present invention, the resin layer used in the appearance skin layer is a structural layer formed by one of PP, PE, and ABS.

In order to manufacture the aforementioned foamed plastic board with an appearance surface, the present invention provides a method for manufacturing a foamed plastic board with an appearance surface. Molding, the foamed plastic material and the resin for the appearance surface layer are injected into the molding cavity by a double-material co-injection molding machine through different feeding pipes.

In the manufacturing method of the present invention, the resin for the appearance surface layer is first injected into the molding cavity, and the foamed plastic material is later injected into the molding cavity of the molding mold to form an integral body.

In the manufacturing method of the present invention, the foamed plastic material and the resin for the appearance surface layer are simultaneously injected into the molding cavity of the molding mold to form an integral body.

In the manufacturing method of the present invention, a gas injection port is provided at the feed pipe or pouring port of a double-material co-injection molding machine, and gas-assisted molding is used during molding.

The invention provides an application of a foamed plastic board with an appearance surface, and the foamed plastic board with an appearance surface can be used as a material for manufacturing a sound box.

In the application of the present invention, the foamed plastic board with an appearance surface is a wood-like surface layered foamed plastic board.

The effect and advantages of the present invention are: the foamed plastic board with appearance surface is a double-layer structure, and its appearance surface layer is formed on the outer surface of the foamed plastic layer naturally after high-temperature pressurized integral molding, so the sticking effect is better than that of the existing sticky board. The sticking effect is better, the glue adhesive layer is omitted, the production process is simplified and the cost is saved. The foamed plastic board on the imitation wood surface can replace the wood raw material, which is of ecological and environmental protection significance.

Fig. 1 is the structural sectional schematic diagram of existing imitation wood product;

Fig. 2 is a schematic cross-sectional view of a preferred embodiment of the present invention;

Fig. 3 is a schematic cross-sectional view of the present invention when injecting resin into the flow process during manufacture;

Fig. 4 is a cross-sectional schematic diagram when the flow process of the present invention injects foamed plastic material during manufacture;

Figure 5 is a schematic cross-sectional view of the process of the present invention when gas-assisted molding is added during production;

Fig. 6 is a three-dimensional cross-sectional view of the finished product of the present invention.

Now in conjunction with accompanying drawing, the present invention is described in detail as follows:

First of all, please refer to Fig. 2, which is a schematic cross-sectional view of a preferred embodiment of the present invention; Imitation wood surface layer 24 (or appearance skin layer), wherein there is a plurality of air bubbles 26 with shockproof or sound insulation effect in this foamed plastic layer 20, but does not exist between foamed plastic layer 20 and imitation wood surface layer 24, as Existing adhesive adhesive layer.

Furthermore, please refer to FIG. 3 to FIG. 5, which are cross-sectional schematic diagrams of each step in the production of a preferred embodiment of the present invention; Simultaneous co-injection molding characteristics, first place a wood-like material 52 doped with wood powder (not shown) in the external barrel 50, and then inject a material through an external feeding pipe 54 and a pouring port 32 The cavity 62 of the mold 60 is injection molded, as shown in FIG. 3 .

While the imitation wood material 52 is still being injected with raw materials, a foamable plastic material 42 stored in another built-in barrel 40 of the double-material co-injection molding machine 30 is also extruded by injection molding technology. Press through an inner feed pipe 44 and the sprue 32, and inject into the mold cavity 62 of the mold 60 to be formed. Affected by the order of arrival and other physical properties, the imitation wood material 52 will move to the outer surface of the mold cavity 62 in the mold cavity 62 (shown in dark color), and the foamed plastic material 42 will move in the mold cavity 62 Flow in the inner core inner layer (dotted light color display), as shown in Figure 4.

In this way, when the entire mold cavity 62 is filled with foamed plastic material 42 and imitation wood material 52 (as shown in FIG. 5 ), and after the temperature is lowered and the mold is ejected, the imitation wood material 52 will naturally cover the hair surface. The outer surface of the foam plastic material 42 does not need additional processing and pasting procedures, so not only the manufacturing process can be simplified, but also the cost can be relatively saved.

Also, since the imitation wood material 52 of the present invention is co-injection-molded with the foamed plastic material 42 through the treated surface under high temperature and pressure, its sticking effect is better than the sticking result of using glue in the past. Of course, the age and quality are relatively better.

In addition, the present invention utilizes a double-material co-injection molding machine so that the imitation wood material 52 will naturally cover the outer surface of the foamed plastic material 42. The gas-assisted injection molding technology can also be used to make the sprue 32 or the feed pipe 44 Add a gas injection port 70 on , 54 to introduce such as nitrogen or inert gas in the mold cavity 62 of the mold 60, to improve the uniform distribution flow rate of the material inside the mold cavity 62, the amount of material used, and assist the rapid prototyping of molten plastic function, as shown in Figure 5.

In the above production process, the foamed plastic material 42 and the imitation wood material 52 are injected into the mold cavity 62 at intervals, but in the actual operation process, the foamed plastic material 42 and the imitation wood material 52 can also be injected simultaneously. People way into the mold cavity 62.

Finally, please refer to Fig. 6, which is a three-dimensional sectional view of the appearance of an embodiment of the present invention; in this embodiment, a speaker box is taken as an example, and the foamed plastic layer 20 with a plurality of bubbles 26 is formed by the above-mentioned foam The plastic material 42 is injection molded, and the imitation wood surface layer 24 that is naturally formed and coated on the outer surface is co-injected by the above-mentioned imitation wood material 52. There is no adhesive layer between the two, so it can be made quickly and used in large quantities. In speaker or loudspeaker materials, it can completely replace the use of wood materials, and has the effect of environmental protection and ecology.

Of course, the present invention is not limited to imitation wood materials, and it can also use polypropylene (PP), polyethylene (PE), or acrylonitrile-butadiene-styrene copolymer (ABS), etc. Resin material, and the doped wood powder can also choose toner (not shown) that can form special color effects. Also, other colors or special effects will be formed on the outer surface layer after co-injection molding. Of course, this special color effect It is not limited to a single primary color, but can also be a combination of multiple colors. And its application is not limited to speakers, such as building materials, household products, or pallets, etc. are all applicable.

However, what is described above is only a preferred example of the present invention, and is not intended to limit the implementation scope of the present invention. Therefore, all equal changes and modifications made according to the shape, structure and spirit described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims (10)

1. A foamed plastic board with an appearance surface, characterized in that: the foamed plastic board with an appearance surface has a double-layer structure, and the double-layer structure includes an injection-molded foamable plastic material. The foamed plastic layer of multiple air bubble chambers and an appearance skin layer covering the outer surface of the foamed plastic layer. 2. The foamed plastic board with an appearance surface according to claim 1, characterized in that: the appearance skin layer is a resin layer mixed with wood flour. 3. The foamed plastic board with appearance surface according to claim 1, characterized in that: the appearance skin layer is a resin layer mixed with toner. 4. The foamed plastic board with an appearance surface according to claim 1, characterized in that: the resin layer used in the appearance skin layer is a structural layer formed by one of PP, PE, and ABS. 5. A method of manufacturing a foamed plastic board with an appearance surface, injecting the foamed plastic material and the resin for the appearance surface layer into the molding cavity of the molding mold to form an integral body, characterized in that: the foamed plastic material and The resin used for the appearance surface layer is injected into the molding cavity by a double-material co-injection molding machine through different feeding tubes. 6. The manufacturing method of a foamed plastic board with an appearance surface according to claim 5, characterized in that: the resin for the appearance surface layer is injected into the molding cavity first, and the foamed plastic material is injected into the molding mold later One-piece molding in the molding cavity. 7. The manufacturing method of a foamed plastic board with an appearance surface as claimed in claim 5, wherein the foamed plastic material and the resin for the appearance surface layer are simultaneously injected into the molding cavity of the molding mold to form an integral body. 8. The manufacturing method of a foamed plastic plate with an appearance surface according to any one of claims 5-7, characterized in that: a gas injection port is provided at the feed pipe or pouring port of a double-material co-injection molding machine , using gas-assisted molding while molding. 9. Use of a foamed plastic board with an appearance surface, the foamed plastic board with an appearance surface can be used as a material for making a sound box. 10. The use of a foamed plastic board with an appearance surface according to claim 9, characterized in that: the foamed plastic board with an appearance surface is a wood-like surface layer foamed plastic board.

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