Mold structure with double-sided film spraying

Abstract

The utility model belongs to the field of composite material generation equipment, and particularly relates to a mold structure with two surfaces coated with films. Comprising a die rack, an upper extrusion die, a lower extrusion die, a shunting die cavity, a pressing die, an upper and lower die connecting plate and the like. The die rack is used for installing the dies, the upper extrusion die and the lower extrusion die are oppositely arranged, and a spraying film can be evenly infiltrated to the surface of fiber yarn. And the shunting die cavity is communicated with the upper and lower extrusion dies to control molten fluid to flow in. The upper and lower extrusion dies are connected with the upper and lower die adjusting screw rods, and angles can be adjusted. The pressing die is in a wave shape, is located on the rear side of the up-down extrusion die and can extrude molten plastic on the surface of the fiber yarn into the fiber yarn. Molten-state fluid is input into the shunting die cavity through upper and lower shunting channels. And the upper and lower die connecting plates connect the upper and lower extrusion dies with the divergent die cavity to form a frame structure. According to the utility model, the production efficiency and quality of products can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of composite material production equipment, in particular to a double-sided laminating die structure. Background Art

[0002] Against the backdrop of increasingly diversified and mature applications of composite materials technology, the application and development of continuous glass fiber reinforced thermoplastic composites have become increasingly mature, placing higher demands on their appearance uniformity, smoothness, and tensile strength. Currently, the common continuous fiber reinforced thermoplastic composite production lines on the market are mainly closed prepreg lines and open coating roller laminating lines. The closed prepreg line has obvious advantages in wettability, but it has the problem of low production speed. Once the production speed is increased, it is easy to cause fiber yarn breakage. At the same time, silt accumulation is easy to occur inside the closed mold cavity, and the cleaning frequency is high. The open coating roller laminating line has a faster production speed, but the wettability of the fiber yarn is poor, and the product surface has many mottled and dry yarn defects. In addition, increasing the depth of impregnation will place higher requirements on the strength of the equipment frame, its structure is complex, and the cost of the laminating section is high.

[0003] Given the uniqueness of the two fiber yarn thermoplastic composite production lines, how to balance the advantages of both, increase the production speed of the production line, and also improve the quality of the product - tensile strength and appearance quality - is an urgent problem to be solved in the existing technology. Utility Model Content

[0004] In order to solve the above technical problems, the utility model proposes a double-sided coating mold structure, which combines a closed prepreg mold and an open coating mold for structural design, and then designs an upper and lower double-mold extrusion discharge structure based on the uniformity and continuity of mold discharge according to the actual working conditions on site, which effectively solves the problem of uneven coating and mottling on the surface of the coated fiber yarn. At the same time, it is similar to a sandwich structure, which can greatly improve the tensile strength of the product.

[0005] In order to achieve the above objectives, this application specifically adopts the following technical means:

[0006] A double-sided lamination mold structure includes a mold frame for installing each mold, an extrusion upper mold and an extrusion lower mold are installed in the mold frame, and the upper and lower extrusion molds are arranged relative to each other to uniformly infiltrate the lamination into the surface of the fiber yarn; a diversion mold cavity is connected to the upper and lower extrusion molds respectively, and is used to control the flow of molten fluid into the upper and lower extrusion molds; the upper and lower extrusion molds are respectively connected to the upper and lower mold adjustment screws, which are used to adjust the horizontal angle of the extrusion upper mold and the extrusion lower mold.

[0007] Furthermore, it also includes a pressing mold located at the rear side of the upper and lower extrusion molds, and the pressing mold is wavy and is used to extrude the molten plastic on the surface of the fiber yarn into the fiber yarn.

[0008] Furthermore, the diversion die cavity respectively inputs the molten fluid into the upper and lower extrusion die cavities through the upper and lower diversion channels. The diversion die cavity is connected to the pipeline through a flange.

[0009] Furthermore, it also includes upper and lower mold connecting plates, which connect the upper and lower extrusion molds and the diversion mold cavity into one to form a frame structure; wherein the upper and lower extrusion molds are connected by connecting plate bolts, and the upper and lower extrusion molds are connected to the diversion mold cavity through a diversion channel.

[0010] The utility model has the following beneficial technical effects:

[0011] The opposing upper and lower extrusion dies enable simultaneous lamination of both the top and bottom surfaces of the fiber yarn. Compared to traditional single-directional lamination methods, this significantly improves production efficiency and reduces production costs per unit time. Furthermore, the relative positioning of the upper and lower extrusion dies allows the lamination to more evenly penetrate the fiber yarn surface, ensuring a uniform and smooth product appearance. This uniform lamination also helps improve mechanical properties such as tensile strength.

[0012] The wave die squeezes the molten plastic from the fiber yarn surface into the fiber yarn, effectively bonding the coating to the fiber yarn. This reduces post-processing time, increases production speed, and ultimately reduces costs. By squeezing the molten plastic into the fiber yarn, defects such as surface mottle and dry yarn are avoided, improving the product's appearance. It also strengthens the bond between the coating and the fiber yarn, enhancing the product's mechanical properties, such as tensile strength.

[0013] The split-flow die cavity directs the molten fluid into the upper and lower extrusion die cavities through upper and lower diversion channels, achieving uniform distribution of the molten fluid and improving lamination efficiency, thereby increasing production speed and reducing costs. Furthermore, this uniform fluid distribution ensures consistent lamination on both sides of the fiber yarn, resulting in a more uniform and aesthetically pleasing product appearance while also improving mechanical properties such as tensile strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural front view of a specific embodiment of the utility model;

[0015] Figure 2 It is a structural cross-sectional view of a specific embodiment of the utility model;

[0016] Figure 3 This is another structural front view of a specific embodiment of the utility model;

[0017] Figure 4 It is a left side view of a specific embodiment of the utility model;

[0018] Figure 5 It is a three-dimensional diagram of a specific embodiment of the present utility model.

[0019] 1. Mold frame; 2. Upper extrusion mold; 3. Lower extrusion mold; 4. Diverter cavity; 5. Wave mold; 6. Upper and lower mold adjustment screws; 7. Upper and lower mold connecting plates; 8. Circulation pipe; DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0021] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, certain parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, the omission of certain well-known structures and their descriptions in the accompanying drawings is understandable.

[0022] See also Figure 1 and Figure 2 The utility model provides a three-in-one double-sided laminating mold structure, which is mainly composed of a mold frame 1, an extrusion upper mold 2, an extrusion lower mold 3, a diversion mold cavity 4, a wave mold 5, a mold adjusting screw 6 and an upper and lower mold connecting plate 7.

[0023] The mold frame 1 serves as the framework for mounting the three molds, securing them and adjusting their positions as well as the overall structural position. The upper extrusion mold 2, lower extrusion mold 3, diverter cavity 4, and wave mold 5 are components related to the laminating and flow channels, ensuring the flow and extrusion of the molten plastic fluid. The mold adjustment screw 6 and upper and lower mold connecting plates 7 are structural mounting components, providing support and position adjustment for the entire mold structure. The mold adjustment screw 6 can be adjusted in height by turning the threaded nut above it. The mold adjustment screw 6 meshes with a gear at the end of the connecting shaft connecting the upper and lower molds. By turning the nut to adjust the height of the mold adjustment screw 6, the connecting shaft 9 rotates, adjusting the horizontal angle of the upper and lower molds. In the initial production state, the upper and lower extrusion molds 2 and 3 must be level. The upper and lower mold connecting plates 7 are connected to the upper and lower extrusion molds 2 and 3, respectively, via bolts. The upper extrusion die 2 and lower extrusion die 3 are commonly used in laminating lines. For products requiring high fiber content, the extrusion laminating film from a single die often has difficulty penetrating the underlying surface layer of the fiber yarn, easily resulting in uneven content and mottled dry yarn. To address this issue, a double-layer die structure was designed. When the fiber yarn passes between the upper extrusion die 2 and lower extrusion die 3, the upper and lower dies extrude molten plastic, which is then applied to the surface of the fiber yarn, forming a sandwich-like structure, with the fiber yarn serving as the "core layer."

[0024] The diverter cavity 4 controls the molten plastic fluid to enter the two vertically arranged mold cavities. Taking into account the fluidity and gravity of the fluid, the molten plastic fluid inside the diverter cavity must be kept full. The molten plastic fluid in the diverter cavity 4 flows into the extrusion upper mold 2 and the extrusion lower mold 3 through the circulation pipe 8, and the circulation pipe 8 is connected to the extrusion mold and the diverter cavity 4 by a flange. The extrusion upper mold 2 and the extrusion lower mold 3 are installed together through the diverter cavity and the mold connecting plate to form a whole. The frame structure formed by the whole can be adjusted in height by the mold adjusting screw 6, thereby adjusting the angle between the fiber yarn and the mold discharge point, so that the fiber yarn can achieve a better impregnation effect.

[0025] The internal structure of the wave mold 5 is wavy. As the wave mold closes, the glass fiber yarn, loaded with molten plastic, is squeezed into the fiber yarn layers. After the wave mold closes, the glass fiber is passively squeezed layer by layer, squeezing the molten plastic from the fiber yarn surface into the fiber yarn, which then exits the wave mold.

[0026] Table 1

[0027]

[0028] In summary, the three-in-one double-sided laminating mold structure of the present invention can effectively improve product quality and production efficiency through the synergistic effect of various components.

Claims

1. A double-sided laminating mold structure, comprising a mold frame for mounting each mold, characterized in that: An upper extrusion mold and a lower extrusion mold are installed in the mold frame. The upper and lower extrusion molds are arranged relatively to each other for evenly infiltrating the coating film into the surface of the fiber yarn; a diversion mold cavity is connected to the upper and lower extrusion molds respectively, for controlling the molten fluid to flow into the upper and lower extrusion molds; the upper and lower extrusion molds are respectively connected to the upper and lower mold adjusting screws, which are used to adjust the horizontal angles of the upper extrusion mold and the lower extrusion mold.

2. The double-sided lamination mold structure according to claim 1, characterized in that: The invention also comprises a pressing die located at the rear sides of the upper and lower extrusion dies, wherein the pressing die is wave-shaped and is used for squeezing the molten plastic on the surface of the fiber yarn into the fiber yarn.

3. The double-sided lamination mold structure according to claim 1, characterized in that: The diversion die cavity inputs the molten fluid into the upper and lower extrusion die cavities through the upper and lower diversion channels respectively.

4. The double-sided lamination mold structure according to claim 1, characterized in that: It also includes upper and lower die connecting plates, which connect the upper and lower extrusion dies and the diversion die cavity together to form a frame structure.

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