Structure for effectively preventing PMMA three-color spliced product from cracking
By optimizing the structural design of PMMA three-color splicing products, and utilizing splicing bosses and inclined extension surfaces, the problems of splicing cracks and bright lines were solved, improving the pass rate and production efficiency of injection molding and reducing costs.
Patent Information
- Application Number
- CN202520405150.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-10
AI Technical Summary
Existing PMMA three-color splicing products have complex structures and are difficult to debug during injection molding. They are prone to cracking at the splicing points, and the cost of mold repair is high, which affects the injection molding pass rate and production efficiency.
A structure comprising a first color sheet, a second color sheet, and a third color sheet is designed, wherein the splicing side of the first color sheet and the second and third color sheets has splicing bosses extending in their respective directions, the third color sheet covers the second color sheet, and the splicing interface is optimized by the design of inclined and horizontally extended surfaces to reduce flow speed and the risk of crushing.
It effectively prevents splicing cracks, reduces bright line issues, improves injection molding pass rate and production efficiency, and reduces manual repair and mold costs without affecting product appearance and mold strength.
Smart Images
Figure CN223826118U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive lamp injection molding technology, specifically relating to a structure that effectively prevents cracking of PMMA three-color spliced products. Background Technology
[0002] Injection molding is a crucial plastic processing method. It involves injecting molten plastic material into a mold, which then cools and solidifies to produce the desired shape. Injection molding technology is widely used across various industries, particularly in the automotive lighting sector, where almost all products are manufactured using this method. Some headlight covers, due to design and aesthetic requirements, need to be made in three colors. This necessitates the use of a three-color, three-station mold. The principle of three-color injection molding involves using a single injection molding machine with multiple injection units and multiple colorant supply systems within the mold, allowing the molded plastic product to possess multiple colors.
[0003] However, in the existing technology, PMMA three-color splicing products still have the following disadvantages in the injection molding process: 1. Complex structure and difficult debugging; 2. Cracking is very easy to occur at the splicing point, causing bright line problems; 3. High mold repair cost, poor product quality will cause great economic pressure. Utility Model Content
[0004] The purpose of this invention is to address the defects and shortcomings of existing technologies by designing a simple, stable, and reliable structure that effectively prevents cracking in PMMA three-color spliced products, overcomes bright line defects, and improves injection molding pass rate and production efficiency.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a structure that effectively prevents cracking of PMMA three-color spliced products, including a first color piece, and a second and third color pieces spliced on the same side of the first color piece. The third color piece covers the second color piece, and the top surface of the third color piece is on the same straight line as the top surface of the first color piece. The splicing side of the first color piece with the second and third color pieces has a first splicing boss extending in the direction of the second and third color pieces. The splicing side of the second and third color pieces, and near the first color piece, has a second splicing boss extending in the direction of the third color piece.
[0006] Preferably, the first splicing boss is designed to slope downward from the top surface of the first color piece, and the width of the first splicing boss is 0.3mm, and the downward slope height is 0.2mm.
[0007] Preferably, the distance between the second splicing boss and the top surface of the third color film is 0.8mm.
[0008] Preferably, the second splicing boss has a horizontally extending surface and a sloped extending surface arranged sequentially along the direction away from the first color piece.
[0009] Preferably, the width of the horizontal extension surface is 1 mm.
[0010] Preferably, the angle between the inclined extension surface and the horizontal plane is 30°.
[0011] After adopting the above technical solution, the structure provided by this utility model for effectively preventing cracking of PMMA three-color spliced products has the following beneficial effects:
[0012] This invention, through the design of the first splicing boss, allows the third color sheet to cover the first color sheet, ensuring a good splicing effect and preventing poor splicing. The design of the second splicing boss reduces the wall thickness of the third color sheet, lowering the risk of damaging the first color sheet during splicing. Furthermore, the horizontal extension surface on the second splicing boss reduces the flow speed of the third color sheet. Therefore, this invention has a simple, stable, and reliable structure. Without affecting the product's appearance or mold strength, it achieves the goal of making the bright line invisible from different angles with minor modifications, improving injection molding yield and production efficiency. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model;
[0014] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point a.
[0015] Among them: first color piece 1, second color piece 2, third color piece 3, first splicing boss 4, second splicing boss 5, horizontal extension surface 6, and inclined extension surface 7. Detailed Implementation
[0016] The present invention will now be described in further clear and complete detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0017] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0018] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0019] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.
[0020] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0021] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0022] This utility model discloses a structure that effectively prevents cracking in PMMA three-color spliced products, and is particularly suitable for larger molds such as three-color taillight covers. Figures 1-2 As shown, it includes a first color sheet 1, and a second color sheet 2 and a third color sheet 3 spliced on the same side of the first color sheet 1. The third color sheet 3 covers the second color sheet 2, and the top surface of the third color sheet 3 is on the same straight line as the top surface of the first color sheet 1. In order to solve the problem that the top surface of the first color sheet 1 and the top surface of the third color sheet 3 are prone to cracking, the splicing side of the first color sheet 1 and the second color sheet 2 and the third color sheet 3 has a first splicing boss 4 extending in the direction of the second color sheet 2 and the third color sheet 3. The splicing side of the second color sheet 2 and the third color sheet 3, and near the position of the first color sheet 1, has a second splicing boss 5 extending in the direction of the third color sheet 3.
[0023] Specifically, the first splicing protrusion 4 is designed to slope downwards from the top surface of the first color sheet 1. The width of the first splicing protrusion 4 is 0.3mm, and the downward slope height is 0.2mm. This design ensures the splicing effect and also creates a covering effect where the third color sheet covers the first color sheet at the first splicing protrusion 4, thus preventing splicing defects. The distance between the second splicing protrusion 5 and the top surface of the third color sheet 3 is 0.8mm. This design reduces the wall thickness at the splicing point between the third color sheet 3 and the first color sheet 1, thereby reducing the risk of the third color sheet 3 damaging the first color sheet 1 when splicing with it. The second splicing protrusion 5 has a horizontally extending surface 6 and a sloped extending surface 7 arranged sequentially in a direction away from the first color sheet 1. Furthermore, the width of the horizontally extending surface 6 is 1mm, which reduces the flow speed of the third color sheet 3. The angle between the sloped extending surface 7 and the horizontal surface is 30°, which further reduces the risk of the third color sheet 3 damaging the first color sheet 1 when splicing with it.
[0024] In summary, the present invention provides a structure that effectively prevents cracking in PMMA three-color spliced products. The structure is simple, stable, and reliable. Without affecting the product appearance and mold strength, it achieves the goal of making the bright lines invisible from different angles and positions through minor modifications. It has the advantages of wide applicability, reduced manual repair and mold costs, and improved injection molding pass rate and production efficiency. It has great market value and is worthy of widespread promotion and application.
[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A structure for effectively preventing cracking in PMMA three-color spliced products, characterized in that: It includes a first color piece (1), and a second color piece (2) and a third color piece (3) spliced on the same side of the first color piece (1). The third color piece (3) covers the second color piece (2), and the top surface of the third color piece (3) is on the same straight line as the top surface of the first color piece (1). The splicing side of the first color piece (1) with the second color piece (2) and the third color piece (3) has a first splicing boss (4) extending in the direction of the second color piece (2) and the third color piece (3). The splicing side of the second color piece (2) with the third color piece (3), and near the position of the first color piece (1), has a second splicing boss (5) extending in the direction of the third color piece (3).
2. The structure for effectively preventing cracking of PMMA three-color spliced products according to claim 1, characterized in that: The first splicing boss (4) is designed to be inclined downward from the top surface of the first color piece (1). The width of the first splicing boss (4) is 0.3mm and the height of the downward inclination is 0.2mm.
3. The structure for effectively preventing cracking of PMMA three-color spliced products according to claim 1, characterized in that: The distance between the second splicing boss (5) and the top surface of the third color piece (3) is 0.8mm.
4. The structure for effectively preventing cracking of PMMA three-color spliced products according to claim 1, characterized in that: The second splicing boss (5) has a horizontally extending surface (6) and a sloped extending surface (7) arranged sequentially in a direction away from the first color piece (1).
5. The structure for effectively preventing cracking of PMMA three-color spliced products according to claim 4, characterized in that: The width of the horizontal extension surface (6) is 1 mm.
6. The structure for effectively preventing cracking of PMMA three-color spliced products according to claim 4, characterized in that: The angle between the inclined extension surface (7) and the horizontal plane is 30°.