Microwave foaming forming mold

Abstract

The utility model discloses a microwave foaming forming die which is made of materials capable of conducting microwave energy, a through hole for microwaves to penetrate through is formed in the die, a die cavity for containing materials to be foamed is arranged in the die, and the through hole is communicated with the die cavity. When the microwave foaming mold is used, a material to be foamed is placed in the mold, a microwave is applied to the mold, and the microwave penetrates through the through hole to act on the material to be foamed, so that the material to be foamed is foamed or preset lines are formed. The through hole is formed in the mold, the microwave can penetrate through the through hole, and the microwave foaming mold is made of materials capable of conducting microwave energy, such as ceramics, metal and the like; and microwaves can be uniformly conducted through the mold, so that the whole foaming material is uniformly heated, the foaming uniformity and stability are ensured, the production efficiency and the product quality are improved, and the problem that the traditional microwave heating uniformity is poor is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of foaming, in particular to a microwave foaming molding die. Background Art

[0002] The existing foaming method mainly promotes the foaming agent in the foaming material to foam and achieve the purpose of foaming molding through heating conduction from an external heat source. However, this heating method is conducted from the outside to the inside of the material, which is prone to uneven heating and makes it difficult to control the quality of the foaming material. With the development of science and technology, the foaming process has gradually derived a heating form of microwave foaming. Microwaves can make specific molecules distributed in the material resonate, improving the above-mentioned traditional uneven conduction technology problem from the outside to the inside. The existing microwave heating method is to use plastic materials that can penetrate microwaves. Microwaves may be partially reflected, absorbed and transmitted when passing through the mold, resulting in uneven heating of the foaming material. Some parts are overheated during the foaming process, while other parts are not enough to obtain the required heating, affecting the quality and consistency of the final product. Moreover, even if a microwave-permeable material is selected to make the mold, there may be insufficient microwave transmission, resulting in the inability of microwave energy to fully penetrate into the interior of the material to be foamed, thereby affecting the foaming effect and rate. Moreover, as the temperature rises during the foaming process, the mold made of all plastic may be damaged or deformed, affecting the stability and durability of the mold. Utility Model Content

[0003] The purpose of the utility model is to provide a microwave foaming molding method to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a microwave foaming molding mold, the mold is made of a material that can conduct microwave energy, and the mold is provided with a through hole for microwave penetration, the mold is provided with a mold cavity for accommodating the material to be foamed, and the through hole is connected to the mold cavity.

[0005] Furthermore, a waveguide is provided in the mold, and microwave energy is conducted to the material to be foamed through the waveguide.

[0006] Furthermore, the mold includes an upper mold base and a lower mold base, the mold cavity is arranged in the lower mold base, the lower mold base is docked with the upper mold base, and the waveguide is correspondingly arranged on the lower surface of the upper mold base.

[0007] Furthermore, the waveguide plate is also correspondingly arranged on the upper surface of the lower mold base.

[0008] Furthermore, the waveguide plate is provided with a through hole, and the through hole is a through hole for microwaves to penetrate.

[0009] Furthermore, a heating device or a cooling device for heating or cooling the mold is arranged outside the mold.

[0010] Furthermore, the mold is provided with an exhaust hole, and the hole of the exhaust hole is bent.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model opens a through hole on the mold for microwaves to penetrate, and is made of materials that can conduct microwave energy, such as ceramics, metals, etc., which have stability and durability. Microwaves can be evenly conducted through the mold, so that the entire foaming material is heated evenly, ensuring the uniformity and stability of foaming, improving production efficiency and product quality, and improving the problem of poor uniformity of traditional microwave heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the assembly structure of the microwave foaming molding mold of the utility model;

[0013] Figure 2 This is another schematic diagram of the assembly structure of the microwave foaming molding mold of the utility model;

[0014] Figure 3 This is a schematic diagram of the assembly structure of the microwave foaming molding mold of the utility model;

[0015] Figure 4 This is another schematic diagram of the assembly structure of the microwave foaming molding mold of the utility model;

[0016] In the figure, 11-through hole, 12-mold cavity, 13-wave-transmitting plate, 14-exhaust hole, 15-waveguide plate, 16-upper mold base, 17-lower mold base. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] like Figure 1 and Figure 2As shown, the present embodiment provides a microwave foaming molding mold, the mold 1 is made of a material capable of conducting microwave energy, for example, it can be a ceramic material, such as alumina ceramics, silicon nitride ceramics, etc., which has good thermal conductivity and high temperature resistance, or it can be a metal material, such as aluminum alloy, stainless steel. Aluminum alloy has good electrical conductivity, is not easy to generate sparks, and will not interfere with microwave heating. Stainless steel is a non-magnetic metal material, which is not easy to interfere with magnetic materials, is not easy to generate sparks, and will not interfere with microwave heating. A through hole 11 for microwave penetration is provided on the mold 1, and the diameter of the through hole 11 is at least 0.07 mm, for example, it can be set to 0.07 mm to 4 mm, so that microwaves can penetrate. A cavity 12 for accommodating a material to be foamed is provided in the mold 1, the through hole 11 is connected to the cavity 12, and is evenly conducted through the mold, so that the foaming material in the cavity 12 is evenly heated. In this embodiment, the mold 1 corresponds to A wave-transmitting plate 13 is arranged at the position of the through hole 11, and the wave-transmitting plate 13 covers the through hole 11. The microwave can pass through the wave-transmitting plate 13, which can not only protect the through hole 11 from the influence of the external environment, such as the entry of dust or impurities, thereby ensuring that the through hole is always unobstructed, which helps to maintain the effective conduction of microwave energy, but also prevents the foaming material from diffusing or overflowing from the through hole 11 during the foaming process. A heating device or a cooling device for heating or cooling the mold 1 is arranged outside the mold 1. The mold is heated or cooled by the heating device or the cooling device, which increases the flexibility of the production process. According to specific needs, the heating or cooling mold can be selected to adapt to the foaming molding process of different materials, thereby improving production efficiency and product quality. An exhaust hole 14 is arranged on the mold 1, and the channel of the exhaust hole 14 is bent to avoid reflection of microwave energy at the exhaust hole 14, while achieving effective exhaust, thereby ensuring the smooth progress of the microwave foaming molding process and improving product quality.

[0019] like Figure 3 and Figure 4As shown, in one embodiment of the utility model, a waveguide 15 is arranged in the mold 1, and microwave energy is transmitted to the material to be foamed through the waveguide 15. The mold 1 includes an upper mold base 16 and a lower mold base 17. The mold cavity 12 is arranged in the lower mold base 17, and the lower mold base 17 is arranged to be connected to the upper mold base 16. The waveguide 15 is correspondingly arranged on the lower surface of the upper mold base 16. The waveguide 15 is provided with a through hole, and the through hole is a through hole 11 for microwave penetration. The through hole can include multiple through holes, and the multiple through holes are evenly distributed on the waveguide 15. A microwave generator is arranged on the upper part of the mold 1, and microwave energy penetrates through the through hole. The microwave energy can penetrate into the mold cavity 12, and the waveguide plate 15 can also be arranged on the upper surface of the lower mold base 17 according to needs. Similarly, a microwave generator is arranged at the lower part of the mold. Waveguide plates 15 can also be arranged on both the upper mold base 16 and the lower mold base 17. A microwave generator is arranged on the upper and lower parts of the mold, so that the microwave energy can be evenly transmitted to the material to be foamed through these through holes to ensure the uniformity and stability of foaming. The shape of the waveguide plates 15 of the upper mold base 16 and the lower mold base 17 matches the mold base 12, and the waveguide plates 15 can also be arranged on the side walls of the mold cavity 12 to achieve uniform conduction. The waveguide plates 15 on the side walls can have through holes or not.

[0020] When in use, the material to be foamed is placed in the mold cavity 12 of the mold, and the upper mold base and the lower mold base are covered to form a closed space, and the microwave generator is started. The frequency range of the microwave is 100MHz~3000GHz, and the power of the microwave is 100W~3000W. The microwave energy penetrates the through hole 11 and enters the mold cavity 12 to act on the material to be foamed, so that foaming molding or forming a preset pattern is formed; the material to be foamed includes unfoamed, slightly foamed, foamed or needs to continue to be molded. The unfoamed state means that the material to be foamed has not been foamed before microwave foaming, and the slightly foamed state means that The material to be foamed is foamed before the microwave foaming, but the foaming is not complete. The foamed state means that the material to be foamed has been foamed before the microwave foaming, and foamed into foamed particles or the foamed particles are continuously foamed and bonded to each other to form a foam body of a preset shape, such as a foamed sole. The state of needing to continue to shape means that the foamed foam body continues to foam to form a pattern, such as the foamed sole continues to foam to form a sole with a pattern shape. The material to be foamed contains a microwave absorbent, so that the foam material has the characteristic of absorbing microwaves. The microwave absorbent includes nitrides, oxides, carbides, and stones. One or more of graphene, glass fiber, carbon fiber or cellulose nanocrystals, the nitride preferably comprises boron nitride, silicon nitride, vanadium nitride, titanium nitride, gallium nitride or aluminum nitride, the oxide preferably comprises aluminum oxide, magnesium oxide, zinc oxide, zirconium oxide, iron oxide, silicon oxide, titanium oxide or copper oxide, the carbide comprises silicon carbide, vanadium carbide, titanium carbide, boron carbide, niobium carbide, molybdenum carbide, tantalum carbide, chromium carbide, hafnium carbide, zirconium carbide, tungsten carbide, carbon fiber or carbon nanotubes, which can promote the uniformity of microwave heating, and the microwave absorption promoter is attached to its surface to promote microwave absorption. The microwave absorption promoter can also be added to the foaming material to further promote the microwave absorption property of the foaming material. The microwave absorption promoter is attached to its surface to achieve the effect of promoting microwave absorption. It is preferably a liquid with polarity or containing polar substances, or it can also be a dissociable / ionizable liquid. For example, it can contain water, surfactants, salts, organic acids, organic alcohols, etc., which can be used alone or in combination with the above materials. The surfactant includes cationic surfactants, anionic surfactants, amphoteric surfactants and non-ionic surfactants.

[0021] For example, the material to be foamed is in an unfoamed state, a slightly foamed state, or a foamed state. The material to be foamed is placed in the mold cavity 12 of the mold. When the upper mold base and the lower mold base are covered, a closed space is formed. The microwave generator is started, and the microwave energy penetrates the through hole 11 into the mold cavity 12 to act on the material to be foamed, so that foaming is performed. The microwave energy can penetrate the wave-transmitting plate 13 and enter the mold cavity 12 through the through hole on the waveguide plate 15. The microwave energy is evenly transmitted to the material to be foamed through the waveguide plate 15 to foam it. The waveguide plate 15 can be set on the upper mold base and the microwave generator can be set on the upper part of the mold. The waveguide plate 15 can also be set on the lower mold base and the microwave generator can be set on the lower part of the mold. The waveguide plate 15 can also be set on both the upper mold base and the lower mold base, and the waveguide plate 15 on the side wall can be set according to needs. Microwave generators are set on the upper and lower parts of the mold. The mold can also be heated or cooled according to specific needs to adapt to the foaming molding process of different materials.

[0022] For example, the material to be foamed is in a state where it needs to continue to be formed. The material to be foamed is placed in the mold cavity 12 of the mold. When the upper mold base and the lower mold base are covered, a closed space is formed. The microwave generator is started, and the microwave energy penetrates the through hole 11 into the mold cavity 12 to act on the material to be foamed, so that foaming is performed. The microwave energy can penetrate the wave-transparent plate 13 and enter the mold cavity 12 through the through hole on the waveguide plate 15. The microwave energy is evenly transmitted to the material to be foamed through the waveguide plate 15 to make it foamed. Since it is necessary to form patterns on the sole and / or the side of the shoe, the waveguide plate 15 can be set on the upper mold base, and a microwave generator can be set on the upper part of the mold. According to specific needs, the heating mold can be selected, especially the lower mold base can be heated, so that the entire material to be foamed is heated more evenly.

[0023] The utility model opens a through hole on the mold for microwaves to penetrate, and is made of a material that can conduct microwave energy, such as ceramics, metals, etc., which has stability and durability. The microwaves can be evenly conducted through the mold, so that the entire foaming material is heated evenly, ensuring the uniformity and stability of foaming, improving production efficiency and product quality, and improving the problem of poor uniformity of traditional microwave heating.

[0024] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A microwave foaming molding die, characterized in that: The mold is made of a material capable of conducting microwave energy, and is provided with a through hole for microwave penetration. A mold cavity for accommodating a material to be foamed is provided in the mold, and the through hole is connected to the mold cavity.

2. The microwave foaming molding die according to claim 1, characterized in that: A waveguide is arranged in the mold, and microwave energy is transmitted to the material to be foamed through the waveguide.

3. The microwave foaming molding die according to claim 2, characterized in that: The mold comprises an upper mold base and a lower mold base, the mold cavity is arranged in the lower mold base, the lower mold base is butt-jointed with the upper mold base, and the waveguide is correspondingly arranged on the lower surface of the upper mold base.

4. The microwave foaming molding die according to claim 3, characterized in that: The waveguide plate is also correspondingly arranged on the upper surface of the lower mold base.

5. The microwave foaming molding die according to claim 3 or 4, characterized in that: The waveguide plate is provided with a through hole, and the through hole is a through hole for microwaves to penetrate.

6. The microwave foaming molding die according to claim 1, characterized in that: A heating device or a cooling device for heating or cooling the mold is arranged outside the mold.

7. The microwave foaming molding die according to claim 1, characterized in that: The mold is provided with an exhaust hole, and the hole of the exhaust hole is bent.

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