Anti-bleed injection mold

Abstract

The utility model provides a kind of anti color mixing injection mold, belong to injection mold technical field.It solves the problem of low production efficiency of existing injection mold processing double color plastic parts.This anti color mixing injection mold includes first fixed mould, second fixed mould and two rotatable movable mould, two movable moulds can form the first forming cavity for injection molding first color plastic parts after closing with first fixed mould, two movable moulds can form the second forming cavity for injection molding second color plastic parts after closing with second fixed mould, the inner wall of two movable moulds is provided with convex edge on the edge of first forming cavity, and convex edge is located on the boundary line of first color plastic parts and second color plastic parts in second forming cavity.This anti color mixing injection mold has the advantage of improving production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology and relates to an anti-color-crossing injection mold. Background Technology

[0002] Two-color injection molds are precision tools that combine two different colors or materials of plastic into a single composite product through two injection molding processes on the same injection molding machine. However, color bleeding can occur during the injection molding process, causing two colors or materials that should be clearly separated to mix or permeate at the boundary, resulting in blurred or mixed colors, or light-colored areas being contaminated by dark-colored areas, directly affecting the appearance and quality of the product.

[0003] To address the above problems, various improvements have been made, some of which have even been patented. For example, Chinese patent literature discloses a process for preventing color bleeding in multi-color covers [Patent No.: 202310123011.8; Application Publication No.: CN116141577A]. The processing technology includes the following steps: S1: Injection molding of the first color product. First, the first color product is injected into the mold cavity in a molten state; S2: Film application. After the first color product is injected in a molten state, its surface still has a high temperature. Then, an anti-color bleeding separator film is applied to the surface of the first color product; S3: Injection molding of the second color product.

[0004] This type of anti-color-bleeding process involves injecting a molten second-color injection molded product onto an anti-color-bleeding separator film. This allows the heat-conducting separator film to be fused together with both the first and second-color injection molded products, forming a cladding layer. The separator film effectively blocks color bleeding, and the two-sided cladding eliminates the risk of color transfer. However, this process adds a film-applying step between the injection molding of the first and second-color products, increasing production difficulty, costs, and efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an anti-color-bleeding injection mold, thereby solving the technical problem of how to improve production efficiency.

[0006] The objective of this utility model can be achieved through the following technical solution: a color-blocking injection mold, comprising a first fixed mold, a second fixed mold, and two rotatable movable molds, wherein the two movable molds, when closed with the first fixed mold, can form a first molding cavity for injection molding a first colored plastic part, and the two movable molds, when closed with the second fixed mold, can form a second molding cavity for injection molding a second colored plastic part, characterized in that the inner walls of the two movable molds each have a protruding edge at the edge of the first molding cavity, and the protruding edge is located on the boundary line between the first colored plastic part and the second colored plastic part in the second molding cavity.

[0007] The two moving molds are designated as the first moving mold and the second moving mold. During operation, the first moving mold is first closed with the first fixed mold. Then, a first colored plastic part, such as black, is injected into the first molding cavity formed after the mold is closed. After cooling, the mold is opened. Then, the two moving molds are rotated to swap their positions, so that the first moving mold is closed with the second fixed mold. Then, a second colored plastic part, such as red, is injected into the second molding cavity formed after the mold is closed. Since the newly injected second colored plastic part has a high temperature, it will cause the surface of the solidified first colored plastic part to melt again, forming a condensed layer with two colors intersecting. The melted first colored plastic part mixes with the second colored plastic part to form a two-color blending layer, which flows with the second colored plastic part. The protrusion is located on the boundary line between the first colored plastic part and the second colored plastic part in the second molding cavity, that is, the protrusion is located on the boundary line between the black area and the red area of ​​the product. The setting of the protrusion will block the flow of the two-color blending layer between the first colored plastic part and the second colored plastic part, so that the first colored plastic part will not flow into the pure red area of ​​the product, thereby preventing color mixing. This anti-color-bleeding injection mold only requires a raised edge to prevent color bleeding, eliminating the need for an additional film application step in two-color injection molding. This facilitates the injection molding of two-color products, improves production efficiency, and reduces production costs. The two moving molds work synchronously with the first and second fixed molds, allowing two products to be produced in a single operation, further enhancing production efficiency.

[0008] In the aforementioned anti-color-bleeding injection mold, the protruding edge and the moving mold are an integral structure. This structure is suitable for newly opened molds, improving the strength of the protruding edge and thus enhancing the stability of anti-color-bleeding.

[0009] In another scenario, in one of the aforementioned anti-color-bleeding injection molds, the flange is welded and fixed to the inner wall of the moving mold. This structure allows existing molds to achieve anti-color-bleeding by welding the flange, eliminating the need to replace the mold and reducing costs.

[0010] In the aforementioned anti-color-crossing injection mold, the protruding edge is in the shape of a straight line, an L-shape, a C-shape, or a square shape. The appropriate protruding edge is selected based on the boundary between the first and second colored plastic parts in the actual product.

[0011] In the aforementioned anti-color-crossing injection mold, the inner wall of the first fixed mold has a recessed groove, which corresponds to the protruding edge. When the moving mold and the first fixed mold are closed, the protruding edge is embedded in the recessed groove. When the thickness of the first colored plastic part is relatively thick, the required height of the protruding edge is relatively high. When the height of the protruding edge is greater than the gap between the moving mold and the fixed mold, a recessed groove is needed to accommodate the protruding edge, allowing the mold to close normally. When the thickness of the first colored plastic part is very thin, the required height of the protruding edge is relatively low. When the height of the protruding edge is less than the gap between the moving mold and the fixed mold, a recessed groove is not needed, and the protruding edge will not affect the normal mold closing.

[0012] Compared with the prior art, the anti-color mixing injection mold provided by this utility model only needs to set a raised edge to block the flow of the two-color blending layer when the first color plastic part and the second color plastic part are mixed, so as to prevent color mixing. This eliminates the need for an additional film application process in the two-color injection molding process, making the injection molding of two-color products more convenient, improving production efficiency, and reducing production costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the anti-color-bleeding injection mold.

[0014] Figure 2 This is a cross-sectional view of the first fixed mold and the moving mold of this anti-color-bleeding injection mold when they are closed.

[0015] Figure 3 This is a cross-sectional view of the second fixed mold and the moving mold when the color-matching injection mold is closed.

[0016] In the figure, 1. First fixed mold; 2. Second fixed mold; 3. Moving mold; 4. First molding cavity; 5. Second molding cavity; 6. Raised edge; 7. Recess; 8. Cooling layer; 9. Two-color blending layer; 10. First color plastic part; 11. Second color plastic part. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] like Figure 1 As shown, this anti-color-crossing injection mold includes a first fixed mold 1, a second fixed mold 2, and two moving molds 3. The two moving molds 3 are fixedly connected to a rotating plate, which allows the two moving molds 3 to rotate.

[0019] After the two moving molds 3 and the first fixed mold 1 are closed, they can form a first molding cavity 4 for injection molding of the first colored plastic part 10, and after the two moving molds 3 and the second fixed mold 2 are closed, they can form a second molding cavity 5 for injection molding of the second colored plastic part 11.

[0020] like Figure 2 As shown, the inner walls of both moving molds 3 have protruding flanges 6 at the edges of the first molding cavity 4, such as... Figure 3 As shown, the protruding edge 6 is located on the boundary line between the first colored plastic part 10 and the second colored plastic part 11 in the second molding cavity 5.

[0021] In this embodiment, the protruding edge 6 and the moving mold 3 are an integral structure. In actual production, the protruding edge 6 is welded and fixed to the inner wall of the moving mold 3.

[0022] In this embodiment, the convex edge 6 is shaped like a c, but in actual production, the convex edge 6 is shaped like a straight line, an L-shape, or a square.

[0023] In this embodiment, the height of the protruding edge 6 is greater than the gap between the moving mold 3 and the first fixed mold 1. The inner wall of the first fixed mold 1 has a recessed groove 7, which is correspondingly provided with the protruding edge 6. When the moving mold 3 and the first fixed mold 1 are closed, the protruding edge 6 is embedded in the groove 7. In actual production, the height of the protruding edge 6 is less than the gap between the moving mold 3 and the first fixed mold 1, so there is no need to provide the groove 7.

[0024] The two moving molds 3 are designated as the first moving mold 3 and the second moving mold 3. During operation, the first moving mold 3 is first closed with the first fixed mold 1. Then, a first colored plastic part 10, such as black, is injected into the first molding cavity 4 formed after the mold is closed. After cooling, the mold is opened. Then, the two moving molds 3 are rotated so that their positions are interchanged, and the first moving mold 3 is closed with the second fixed mold 2. Then, a second colored plastic part 11, such as red, is injected into the second molding cavity 5 formed after the mold is closed. Since the newly injected second colored plastic part 11 has a high temperature, the surface of the solidified first colored plastic part 10 will melt again to form a condensation layer 8. The melted first colored plastic part 10 and the second colored plastic part 11 mix to form a two-color blending layer 9, which flows with the second colored plastic part 11. Finally, the two-color blending layer 9 is blocked by the protrusion 6, preventing the two-color blending layer 9 from flowing to the pure red area, thereby preventing color bleeding.

[0025] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0026] Although this document frequently uses terms such as first fixed mold 1, second fixed mold 2, moving mold 3, first molding cavity 4, second molding cavity 5, raised edge 6, recessed groove 7, condensation layer 8, two-color blending layer 9, first color plastic part 10, second color plastic part 11, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A color-blocking injection mold, comprising a first fixed mold (1), a second fixed mold (2), and two rotatable movable molds (3), wherein the two movable molds (3), when closed with the first fixed mold (1), can each form a first molding cavity (4) for injection molding a first colored plastic part (10), and the two movable molds (3), when closed with the second fixed mold (2), can each form a second molding cavity (5) for injection molding a second colored plastic part (11), characterized in that, The inner walls of the two moving molds (3) each have a protruding edge (6) at the edge of the first molding cavity (4), and the protruding edge (6) is located on the dividing line between the first colored plastic part (10) and the second colored plastic part (11) in the second molding cavity (5).

2. A register preventing injection mold according to claim 1, wherein The protruding edge (6) and the moving mold (3) are an integral structure.

3. A register preventing injection mold according to claim 1, wherein The protruding edge (6) is welded and fixed to the inner wall of the moving mold (3).

4. A color-blocking injection mold according to claim 1, 2, or 3, characterized in that, The protruding edge (6) is in the shape of a straight line, an L-shape, an octagonal shape, or a square shape.

5. A color-blocking injection mold according to claim 1, 2, or 3, characterized in that, The inner wall of the first fixed mold (1) has a recessed groove (7), which is corresponding to the protruding edge (6). When the moving mold (3) and the first fixed mold (1) are closed, the protruding edge (6) is embedded in the groove (7).

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