WO2023109152A1

WO2023109152A1 - Molded part and release-fabric-free method for producing same

Info

Publication number: WO2023109152A1
Application number: PCT/CN2022/110493
Authority: WO
Inventors: 张健侃; 王运明; 刘召军; 李雪建; 姜栋; 权利军; 章靓; 周胜林; 张俊雄
Original assignee: 振石集团华智研究院(浙江)有限公司
Priority date: 2021-12-15
Filing date: 2022-08-05
Publication date: 2023-06-22

Abstract

Provided are a molded part and a release-fabric-free method for producing same. The molded part comprises a body (1), wherein the body (1) comprises a base material (11), and a plurality of release portions (12), which are dispersed in the base material (11), such that a base material region (111), and a plurality of release regions (112), which are surrounded by the base material region (111), are formed at a surface of the body (1). The base material region (111) is formed by a surface of the base material (11), and the release regions (112) are formed by surfaces of the release portions (12). The molded part is produced without release fabric, such that the interlayer bonding force of the molded part can be ensured while achieving convenient and rapid release, thereby meeting the actual usage requirements.

Description

A kind of mold forming part and its production method without release cloth

This disclosure claims the priority of the Chinese patent application with the application number 202123172274.3 and the application name "a molded part" filed with the China Patent Office on December 15, 2021, the entire contents of which are incorporated in this application by reference; The application claims the priority of the Chinese patent application with the application number 202111643254.1 and the application title "A Mold Formed Part and Its Production Method Without Release Cloth" filed with the China Patent Office on December 29, 2021, the entire contents of which are incorporated by reference incorporated in this application.

technical field

The present disclosure relates to, but is not limited to, a molded part and a method for producing it without release cloth.

Background technique

Pultruded board products of composite materials have been widely used in the production of wind energy blades because of their advantages such as strong mechanical properties and light weight. Pultruded sheets are usually manufactured by laminating and laminating fiber materials and vacuum infusing resins, but it is not easy to demould the pultruded sheets after the resin is cured and formed.

Contents of the invention

The following is an overview of the subject matter described in detail in this disclosure. This summary is not intended to limit the scope of the claims.

The disclosure provides a molded part and a production method thereof without release cloth.

A first aspect of the present disclosure provides a molded product including a body including a base material and a plurality of mold release parts dispersed in the base material so that the surface of the body A substrate region and a plurality of release regions surrounded by the substrate region are formed, wherein the substrate region is formed by the surface of the substrate, and the release region is formed by the surface of the release portion.

According to some embodiments of the present disclosure, the material of the base material includes a resin material, and the release part is formed by reacting a release agent material with the resin material in the base material.

According to some embodiments of the present disclosure, the plurality of demoulding areas are distributed on the surface of the body in a point shape or in a network shape.

According to some embodiments of the present disclosure, the plurality of release areas occupy less than 30% of the surface of the body.

According to some embodiments of the present disclosure, the mold forming part further includes a plurality of yarns threaded in the body.

According to some embodiments of the present disclosure, the molded part is a composite pultruded sheet.

The second aspect of the present disclosure provides a method for producing molded parts without release cloth, characterized in that the production method comprises:

mixing the base material and the release agent material to obtain a mixed material;

placing at least the mixed material in a mold for molding;

After the molding is completed, the structural parts in the mold are demolded to obtain the molded part.

According to some embodiments of the present disclosure, at least placing the mixed material in a mold for molding includes:

The composite material and the plurality of yarns are placed in a mold for shaping.

According to some embodiments of the present disclosure, the molding of the mixed material and the plurality of yarns in a mold includes:

dipping the plurality of yarns into the blend material such that the blend material wraps each yarn;

Multiple yarns impregnated with the mixed material are placed in a mold for shaping.

According to some embodiments of the present disclosure, in the mixed material, the release agent material accounts for 1%-2% of the whole material.

The molded parts provided by the embodiments of the present disclosure use the base material and the demoulding part to jointly form the molded part body, and the demoulding part is scattered on the surface of the base material to ensure the interlayer bonding force between the molded parts body. While it can be demoulded normally, it will not affect the normal use of the molded parts. In the actual production process, the processing steps are reduced, the risk of use is reduced, and the quality of the molded parts is guaranteed. The pollution problem after the release cloth is removed is solved, and the manufacturing cost is greatly reduced.

Other aspects will be apparent to others upon reading and understanding the drawings and detailed description.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and, together with the description, serve to explain principles of the embodiments of the disclosure. In the drawings, like reference numerals are used to denote like elements. The drawings in the following description are some, but not all, embodiments of the present disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

Fig. 1 is a schematic structural view of a molded part shown according to an exemplary embodiment;

Fig. 2 is a top view of a molded part shown according to an exemplary embodiment;

Fig. 3 is a schematic cross-sectional view of a molded part shown according to an exemplary embodiment;

Fig. 4 is a schematic structural view of a molded part shown according to an exemplary embodiment;

Fig. 5 is a schematic structural view of a molded part shown according to an exemplary embodiment;

Fig. 6 is a flow chart of a method for producing molded parts without release cloth according to an exemplary embodiment.

Reference signs:

1. Body; 11. Base material; 111. Base material area; 12. Mold release part; 112. Mold release area; 13. Connection part.

Detailed ways

The following will clearly and completely describe the technical solutions in the disclosed embodiments with reference to the drawings in the embodiments of the present disclosure. Apparently, the described embodiments are part of the embodiments of the present disclosure, not all of them. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present disclosure. It should be noted that, in the case of no conflict, the embodiments in the present disclosure and the features in the embodiments can be combined arbitrarily with each other.

Pultruded sheet products have been widely used in the production of wind energy blades because of their advantages such as strong mechanical properties and light weight. Pultruded sheets are usually manufactured by laminating and laminating fiber materials and vacuum infusing resins, but it is not easy to demould the pultruded sheets after the resin is cured and formed. Therefore, in order to facilitate demoulding after the pultruded sheet is manufactured, a demoulding structure is usually covered on the surface of the pultruded sheet. Common release products include release cloth and release agent, and the release products are covered on the surface of the pultruded sheet to facilitate the rapid release of the formed pultruded sheet. However, there are some problems in the use of the existing release products, such as the high water absorption of the release cloth, which will affect the quality of the pultruded sheet, and will eventually affect the pass rate of the product. Another example is that the release agent will affect the bonding performance of the pultruded sheet, and will migrate to the surface of the pultruded sheet over time, resulting in a risk of use.

In order to solve the above problems, the present disclosure provides a molded part and its production method without a demoulding part. The molded part adopts the combination of the base material and the demoulding part, which solves the problem that traditional demoulding products affect the yield of pultruded sheets , while ensuring the smoothness of the substrate surface, reducing the waste of resources and simplifying the processing steps.

The molded part provided by the present disclosure and its production method without release cloth will be described in detail below with reference to the accompanying drawings.

With reference to a mold molding in the embodiment shown in Figure 1, the mold molding includes a body 1, the body 1 includes a base material 11 and a plurality of demoulding parts 12 dispersedly arranged in the base material 11, that is, a plurality of demoulding parts 12 The mold part 12 is doped in the base material 11, so, in the surface of the body 1 formed by the base material 11 and the mold release part 12, there are both the surface of the base material 11 and the surface of the mold release part 12, as shown in Figure 2 As shown, the surface of the body 1 forms a substrate region 111 and a plurality of release regions 112 surrounded by the substrate region 111, wherein the substrate region 111 is formed by the surface of the substrate 11, and the release region 112 is formed by the release portion 12 surface formations. The release part 12 is scattered in the base material 11 and surrounded by the base material 11, so that the surface of the body 1 includes both the surface of the base material 11 and the surface of the release part 12. On the one hand, it is dispersed on the surface of the body 1 The surface of the demoulding part 12 can ensure the surface smoothness of the molded parts, thereby facilitating the demoulding of the molded parts. On the other hand, it also ensures the yield of the molded parts and saves resources. Because the amount of the added release agent is small, it does not have other harmful reactions with other materials in the molded part, thus ensuring the yield of the molded part. The processing process is simplified, and it is not necessary to add a release cloth during the processing, and to remove the release cloth from the finished product later. At the same time, it also improves the bonding effect between the molded parts and realizes wider application. It can be understood that the molded part mentioned in the present disclosure refers to a structural part that is processed by a mold and needs to be demoulded after the processing is completed.

As an exemplary embodiment of the present disclosure, the material of the base material 11 includes a resin material, and the release part 12 is formed by reacting the release agent material with the resin material in the base material 11 . The mold release parts 12 are usually distributed in an irregular state in the base material 11 , and their distribution areas are relatively scattered, and there will be no large-area aggregation. Its shape can be spherical, ellipsoidal, dot-like, flake-like, block-like, etc., and is not specifically limited here. As shown in FIG. 3 , the release agent material is combined with the resin material, and part of the release part 12 will migrate to the surface of the molded part as shown in FIG. 2 during the use of the molded part. Generally, the smaller the coverage area of the mold release part 12 is, the higher the safety of the molded part will be. The outer contour shape of the mold release part 12 on the surface of the substrate 11 includes a circle, an ellipse, a triangle, a quadrangle and/or a star. Referring to Fig. 4, the mold release part 12 is evenly arranged on the surface of the substrate in a star shape, and in more applications, the mold release part 12 can also be fixed on the substrate in the above-mentioned various forms, such as circular, Ellipse, triangle, quadrangle, etc. are not specifically limited here. In a section perpendicular to the surface of the base material 11 , the cross-sectional shape of the mold release part 12 includes triangular, square, and/or arcuate. The cross-sectional shape of the demoulding part 12 may be square, and in practical applications, the cross-section of the demoulding part 12 may also often present a triangular or arcuate shape. In one embodiment, if the mold release part 12 is arranged on the surface of the base material 11 in an irregular shape, its cross-section can be shown as an arch. In this embodiment, the release part 12 is mainly composed of a release agent. Referring to FIG. 3 , the release agent material reacts with the resin material to form a release portion 12 on the surface of the substrate.

In another embodiment, connecting branches are formed between the mold release part 12 and the base material 11. Exemplarily, these connecting branches can be formed by the reaction of a release agent material and a resin material. distribution, so that the base material 11 can fix the entire periphery of the demoulding part 12 through a plurality of connecting branches, that is, the demoulding part 12 has a plurality of fastening points in the circumferential direction, and the connecting branches have a certain degree of stability, thus to a certain extent The migration of the demoulding part 12 is limited above, and the problem of a large amount of migration of the demoulding part 12 will not occur during the use of the molded part, thereby ensuring the product quality of the molded part.

As an exemplary embodiment of the present disclosure, a plurality of demoulding areas 112 are distributed on the surface of the main body 1 in a dot shape or in a network shape. The plurality of mold release regions 112 can be arranged in an array on the surface of the substrate 11 , or, the distance between at least some of the mold release regions 112 in the plurality of mold release regions 112 is not equal. Referring to Figure 1 and Figure 2, a plurality of demoulding areas 112 are arranged in a certain array on the surface of the substrate, the array can be a regular array as shown in Figure 1, or a plurality of demoulding areas 112 in a cluster Shapes and blocks are arranged in an array on the surface of the substrate 11, and the spacing between the multiple release areas 112 in the formed regular array is equal. In another embodiment, the plurality of release areas or at least part of the release areas are not equally spaced and not arranged in a regular array. The release area 112 is distributed on the surface of the main body 1 in the form of dots or nets. The distribution of the release area 112 under this structure is relatively wide, which greatly reduces the influence on the surface smoothness of the substrate 11 .

In one embodiment, as shown in FIG. 5 , the body 1 further includes a connecting portion 13 connecting adjacent demoulding portions 12 . The connection part 13 connects each adjacent mold release part 12 and is jointly arranged on the surface of the base material 11 . Referring to FIG. 5 , each connecting portion 13 and a plurality of demoulding portions 12 form a network structure. The connecting part 13 connects the adjacent demoulding parts 12 to form a network structure, and is arranged on the surface of the base material 11, which can expand the setting range of the base material 11 and further optimize the demoulding process.

As an exemplary embodiment of the present disclosure, the plurality of release regions 112 occupy less than 30% of the surface of the body. At this time, the surface roughness of the substrate 11 is less than or equal to 2 µm. Referring to FIG. 1 , it can be seen that the mold release area 112 is disposed on the surface of the substrate 11 in the illustrated structure, resulting in a probability of the mold release area 112 being disposed on the surface area of the substrate 11 less than 30%. Due to this arrangement of the demoulding area 112, rapid demoulding can be achieved without affecting the quality of the molded part. In one embodiment, the surface roughness of the molded part is less than or equal to 2 microns, and the surface of the substrate 11 is provided with a release area 112 , because the roughness is less than or equal to 2 microns, so the molded part has extremely high smoothness.

As an exemplary embodiment of the present disclosure, the mold forming part further includes a plurality of yarns passing through the body 1 . Wherein, the multiple yarns include carbon fiber, glass fiber, and under certain circumstances, the multiple yarns also include basalt fiber. Among the multiple yarns passing through the body 1 , a single yarn can be selected for the yarn, and yarns of various materials can also be mixed, which is not specifically limited here. For example, in a specific embodiment, an indefinite number of carbon fiber yarns are selected for arranging the molded part, and the indefinite number of carbon fiber yarns are arranged in parallel at fixed intervals, or arranged in other ways, such as crossing. In another specific embodiment, the molded parts are mixed with carbon fiber yarns and glass fiber yarns and arranged in parallel at fixed intervals, or arranged in a crossing manner. Another example is that the molded parts are mixed with basalt fiber yarn and glass fiber yarn and arranged in parallel at fixed intervals, or arranged in a cross manner. Wherein, the specific yarn selection is determined according to the actual situation. After arranging multiple yarns, they are mixed with the base material, and the molded parts mixed with yarns have stronger structural connectivity and stronger force resistance. Therefore, in this example, the fiber yarns of the above-mentioned materials are selected for line arrangement to ensure the structural strength of the molded part.

As an exemplary embodiment of the present disclosure, the molded part is a composite pultruded board. The composite pultruded board in this embodiment is jointly made of multiple yarns, resin and release agent. A variable number of carbon fibers, glass fibers and basalt fibers are arranged in a preset way, and the arranged yarns are mixed with resin and release agent to form a composite pultruded board in the mold. Wherein, the preset method refers to single use of any one of carbon fiber, glass fiber and basalt fiber for arrangement, or a combination of carbon fiber, glass fiber and basalt fiber for arrangement. In an embodiment, the base material 11 may also be strip-shaped or block-shaped in practical applications.

As an exemplary embodiment of the present disclosure, the base material 11 includes a thermosetting resin plate and a plurality of yarns threaded in the resin plate. Wherein, the multiple yarns include carbon fiber, glass fiber, and under certain circumstances, the multiple yarns also include basalt fiber. The base material 11 can be made of thermosetting resin to form the base material 11 into a resin board. The yarns passing through the resin board can be made of carbon fiber, glass fiber, basalt fiber, etc. The yarns in the resin board can be selected from a single type of yarn, and yarns of various materials can also be mixed, which is not specifically limited here.

As an exemplary embodiment of the present disclosure, among the plurality of mold release parts 12, at least some of the mold release parts 12 have different thicknesses. The thickness of the mold release part 12 is the vertical distance from the highest point on the top surface of the mold release part 12 to the connection point with the base material 11 . In this embodiment, the mold release part 12 fixedly connected to the base material 11 can be provided on the surface of the base material 11 with different thicknesses.

As another embodiment of the present disclosure, a method for producing a molded part without a release cloth is also provided. In the production method of the molded part, the normal demoulding of the structural part can be realized without using a release cloth. Fig. 4 shows the flow chart of the production method without release cloth of this mold molding, and as shown in Fig. 6, this production method comprises the steps:

S100: Mixing the base material and the release agent material to obtain a mixed material.

In this step, the base material and the release agent material are mixed to obtain a mixed material. Wherein, for example, the substrate material can be a thermosetting resin, the release agent material can be a silane release agent, and the above thermosetting resin and the silane release agent are mixed to form a mixed material, which is a subsequent operation step Prepare materials.

S200: At least placing the mixed material in a mold for molding.

In this step, at least the mixed material is placed in the mold, and the mold is heated or cooled to make the liquid mixed material solidified in the mold. Since the mixed material is made of thermosetting resin and silane release agent Mixing according to the preset ratio, the surface roughness of the thermosetting resin after curing is less than or equal to 2 microns, so the surface smoothness of the molded part is the highest, preparing for the subsequent rapid demoulding.

S300: After the molding of the mold is completed, the structural parts in the mold are demolded to obtain molded parts.

After the mold forming is completed, the structural parts in the mold are demoulded to obtain molded parts. Due to the characteristics of the mixed material, the surface roughness of the mold after curing is less than or equal to 2 microns, showing a smooth surface, so that the mold after curing can be quickly demoulded to form molded parts.

Due to the high smoothness of the molded parts, based on its own characteristics, it can fully meet the conditions of rapid demoulding, that is, due to the branching reaction between the release agent material and the resin material, this reaction meets the demoulding conditions of the molded parts. Therefore, in this step, the step of rapid demoulding can be completed without a demoulding part, and it is not necessary to add a demoulding cloth during the production process. Therefore, the release cloth is not needed in the production process of the molded part provided by the present disclosure, and the substrate material and the release agent material are mixed and then placed in the mold for curing and molding operations. The molded parts made by this method do not use the release cloth, which solves the problem that the pultruded sheet will form a rough surface after the release cloth is removed, and the pultruded sheet with a rough surface needs to be improved according to the actual application. The problem of smoothness treatment reduces processing steps and saves resources.

In one embodiment, since the mold release part 12 is made of a release agent material, and the base material 11 is made of a base material, a structure as shown in FIG. 3 is formed when the molded part is cured, wherein the release agent material is mixed in the base material. During actual use, the release agent material will gradually migrate to the surface of the substrate 11 to form a structure as shown in FIG. 2 , that is, the release agent material can be regularly or irregularly arranged on the surface of the substrate 11 . However, this migration process does not affect the quality of the molded part, nor does it affect other structures, fibers, etc.

In step S200, at least the mixed material is placed in a mold for molding. In other embodiments, the mixed material is mixed with a plurality of yarns and placed in a mold, and solidified and formed in the mold to form a solid shaped moldings. That is, the molded part is a structure in which a plurality of yarns are mixed with a mixed material and then cured. Multiple yarns can be arranged with carbon fiber, glass fiber and basalt fiber according to a single type or a mixture of multiple types of yarns. The resin can be thermosetting resin, etc., and mixed with the release agent material, and the mixed resin and release agent are poured into the mold together with the arranged yarns to be cured and shaped together. The cured molded parts can be demolded quickly to form finished products. As an exemplary embodiment of the present disclosure, at least placing the mixed material in a mold for molding includes: placing the mixed material and a plurality of yarns in a mold for molding. The mixed material includes resin and release agent. The release agent can be a silane release agent. This type of release agent can be poured into the mold after being mixed with a thermosetting resin, and together with multiple yarns in the mold Curing and forming. Referring to Figure 3, the release agent is mixed with a thermosetting resin to form a mixed material, and then mixed with a plurality of yarns and placed in a mold for curing and molding. Since the release agent is mixed with the thermosetting resin, the surface of the molded part is smooth and complete, and the release agent will not adhere to the surface of the molded part in a large area, which saves the processing work of the molded part in the later stage and does not need to be used again Release cloth, saving resources.

As an exemplary embodiment of the present disclosure, placing the mixed material and a plurality of yarns in a mold for molding includes: dipping a plurality of yarns into the mixed material, so that the mixed material wraps each yarn; Multiple yarns of mixed material are placed in a mold for shaping. The mixed material completely wraps the multiple yarns, so that the mixed material can evenly and completely cover the multiple yarns, and then it is placed in the mold for curing and setting, which enhances the structural strength of the molded part. In a specific embodiment, in the production process of molded parts, multiple yarns are first drawn, and after the multiple yarns pass through multiple yarn drawing devices, the tension of the yarns is increased, and the tension of the multiple yarns is increased. The yarn can better maintain the distance between the yarns, realize a more uniform combination with the mixed material, and prevent the surface of the mixture from protruding or sinking, so that the texture of the molded part after post-processing is more uniform. After yarn drawing, multiple yarns enter the mold and then mix with the mixed material. During this process, in order to ensure that the mixed material is evenly combined with multiple yarns, the mixed material is evenly and completely covered with each yarn, and then The mixture mixed with the mixed material is introduced into the heating and curing device. The cured molded parts are uniform in texture and smooth in surface and can be quickly demolded. After demoulding, the molded parts can be cut or other operations according to actual use requirements. Therefore, the molded part formed based on the method is solid, stable in structure, light in weight, and suitable for various applications.

As an exemplary embodiment of the present disclosure, in the mixed material, the proportion of the release agent material to the whole material is 1%-2%. The molded parts made of this ratio, the base material and the release agent material are mixed as shown in Figure 3, which greatly reduces the use ratio of the release agent, reduces the cost, and ensures that the quality of the molded parts is not affected. The effect of release agent. It can also ensure a high yield rate of molded parts, high demoulding efficiency, high quality of the finished product itself, and high safety during use.

The molded part of the present disclosure greatly reduces the manufacturing cost due to the removal of the release cloth material and avoiding the addition of excessive release agent material. Moreover, when the use of the above materials is reduced, the problem of environmental pollution caused by the waste materials generated during the processing can be solved. Finally, while solving the above-mentioned problems, the molded part of the present disclosure also ensures the interlayer bonding force between the molded parts, and ensures its quality and use effect.

Each embodiment or implementation manner in this specification is described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In the description of this specification, descriptions with reference to the terms "embodiments", "exemplary embodiments", "some implementations", "exemplary implementations", "examples" and the like mean that the descriptions are described in conjunction with the implementations or examples. A specific feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure.

In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation are therefore not to be construed as limitations on the present disclosure.

It can be understood that the terms "first", "second" and the like used in the present disclosure can be used to describe various structures in the present disclosure, but these structures are not limited by these terms. These terms are only used to distinguish one structure from another.

In one or more drawings, like elements are indicated with like reference numerals. For the sake of clarity, various parts in the drawings are not drawn to scale. Also, some well-known parts may not be shown. For simplicity, the structure obtained after several steps can be described in one figure. In the following, many specific details of the present disclosure, such as structures, materials, dimensions, processing techniques and techniques of devices, are described for a clearer understanding of the present disclosure. However, as will be understood by those skilled in the art, the present disclosure may be practiced without these specific details.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present disclosure.

Industrial Applicability

The molded parts provided by the embodiments of the present disclosure use the base material and the demoulding part to jointly form the molded part body, and the demoulding parts are scattered on the surface of the base material to ensure the interlayer bonding force between the molded parts body. While it can be demoulded normally, it will not affect the normal use of the molded parts. In the actual production process, the processing steps are reduced, the risk of use is reduced, and the quality of the molded parts is guaranteed. The pollution problem after the release cloth is removed is solved, and the manufacturing cost is greatly reduced.

Claims

A molded part, the molded part comprising a body (1), the body (1) comprising a base material (11) and a plurality of demoulding parts (12) dispersedly arranged in the base material (11) , so that the surface of the body (1) forms a substrate region (111) and a plurality of demoulding regions (112) surrounded by the substrate region (111), wherein the substrate region (111) consists of The surface of the substrate (11) is formed, and the release region (112) is formed by the surface of the release part (12).
The molded part according to claim 1, wherein the material of the base material (11) comprises a resin material, and the release part (12) is made of a release agent material and the resin in the base material (11). The material reacts to form.
The molded part according to claim 1, wherein the plurality of demoulding areas (112) are distributed on the surface of the body (1) in a point shape or in a network shape.
The molded part according to claim 1, wherein the plurality of demoulding areas (112) occupy less than 30% of the surface of the body (1).
The mold forming part according to any one of claims 1 to 4, wherein the mold forming part further comprises a plurality of yarns threaded in the body (1).
The mold forming according to any one of claims 1 to 4, wherein the mold forming is a composite pultruded sheet.
A method for producing a molded part without release cloth, the production method comprising:

mixing the base material and the release agent material to obtain a mixed material;

placing at least the mixed material in a mold for molding;

After the molding is completed, the structural parts in the mold are demolded to obtain the molded part.
The production method according to claim 7, wherein said at least placing the mixed material in a mold for molding comprises:

The composite material and the plurality of yarns are placed in a mold for shaping.
The production method according to claim 8, wherein said placing said mixed material and a plurality of yarns in a mold for molding comprises:

dipping the plurality of yarns into the blend material such that the blend material wraps each yarn;

Multiple yarns impregnated with the mixed material are placed in a mold for shaping.
The production method according to any one of claims 7 to 9, wherein, in the mixed material, the proportion of the release agent material to the whole material is 1%-2%.