Two-in-one strip-shaped runner in-mold composite extrusion die

Abstract

The application provides a one-to-two bar-shaped flow channel mold in-mold composite extrusion die head, which comprises an upper mold, a middle mold, a lower mold and left and right side plates, the front end of the middle mold is connected with a middle mold insert, the rear end of the middle mold is provided with a feeding port and a feeding channel, the feeding channel is divided into an upper flow channel and a lower flow channel to the left and right sides of the upper mold and the lower mold, the upper flow channel reaches the front end of the top surface of the middle mold insert after flowing through the joint surface of the upper mold and the middle mold, the lower flow channel reaches the front end of the bottom surface of the middle mold insert after flowing through the joint surface of the lower mold and the middle mold, and the upper flow channel and the lower flow channel are extruded after being combined and then extruded upwards and downwards, a series of first flow guide strips are arranged on the front end of the top surface of the middle mold insert and are parallel and equidistantly inclined to the left or to the right, a series of second flow guide strips are arranged on the front end of the bottom surface of the middle mold insert and are parallel and equidistantly inclined to the right or to the left, and the raw materials are extruded in the form of a composite layer of upper and lower layers which are inclined and crossed with each other at the combined flow channel. The upper and lower crossed structures meet the transverse performance and the longitudinal performance of the film product.

Description

Technical Field

[0001] This invention relates to an extrusion die, and more particularly to a composite extrusion die with a two-slot flow channel. Background Technology

[0002] LCP film is a key electronic insulating raw material required for the preparation of high-frequency FCCL in the 5G era. Due to the dual properties of high liquid fluidity and ordered crystal orientation of LCP material, film formation is extremely difficult. One common production method is extrusion casting (biaxial stretching). In extrusion casting, LCP resin is heated, melted, and plasticized in an extruder, then extruded through a T-shaped die, cast onto a cooling roller, cooled and shaped, and then drawn, trimmed, and wound to obtain the final LCP film product. Currently, single-layer dies cannot effectively control the flow direction of the raw material during the extrusion process, and directly extruded LCP films cannot meet the dual requirements of transverse and longitudinal properties of the film product. Summary of the Invention

[0003] To address the aforementioned problems, this invention aims to provide a two-strip in-mold composite extrusion die to solve the problem of raw material flow orientation during processing, thereby enabling the final extruded LCP film to meet the comprehensive requirements of transverse and longitudinal properties.

[0004] The technical solution of this invention is a two-strip flow channel in-mold composite extrusion die head, including an upper die, an intermediate die, a lower die, and left and right side plates. The front end of the intermediate die is connected to an intermediate die insert, and the rear end of the intermediate die is provided with a feed port and a feed channel. The feed channel splits the flow to the upper and lower dies to form an upper flow channel and a lower flow channel. The upper flow channel flows through the interface between the upper die and the intermediate die and reaches the front end of the top of the intermediate die insert. The lower flow channel flows through the interface between the lower die and the intermediate die and reaches the front end of the bottom of the intermediate die insert. After being combined and extruded through the converging flow channel in front, the upper and lower layers are extruded. The front end of the top of the intermediate die insert is provided with a series of parallel and equally spaced first guide strips that are inclined to the left or right. The front end of the bottom of the intermediate die insert is provided with a series of parallel and equally spaced second guide strips that are inclined to the right or left. The raw material forms a composite layer of raw material extrusion with upper and lower layers that are inclined and intersecting each other at the converging flow channel.

[0005] Preferably, the upper and lower surfaces of the front end of the intermediate mold insert are conical surfaces. The upper flow channel includes a first upper flow channel located between the upper mold and the intermediate mold, and a second upper flow channel located between the upper mold and the intermediate mold insert. The lower flow channel includes a first lower flow channel located between the lower mold and the intermediate mold, and a second lower flow channel located between the lower mold and the intermediate mold insert. A portion of the raw material passes through the first and second upper flow channels and then enters the upper layer of the converging flow channel after being tilted to one side by the first guide bar. Another portion of the raw material passes through the first and second lower flow channels and then enters the lower layer of the converging flow channel after being tilted to the other side by the second guide bar. The same raw material forms an inclined cross structure in the upper and lower layers.

[0006] Preferably, the tilt angle of the first guide strip and the second guide strip is 30° to 60°.

[0007] Preferably, the first guide strip and the second guide strip have the same inclination angle, the front ends of the second guide strip and the front ends of the first guide strip are staggered from each other, and the spacing between the second guide strips is the same as the spacing between the first guide strips.

[0008] This invention solves the problem of flow orientation of LCP raw materials during processing, so that the extruded LCP film has an up-and-down inclined cross structure, and the final extruded LCP film meets the comprehensive requirements of transverse and longitudinal properties. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention;

[0010] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0011] Figure 3 This is a schematic diagram of the structure of the intermediate mold insert in this invention;

[0012] Wherein: 1—upper mold; 2—intermediate mold; 3—lower mold; 4—intermediate mold insert; 41—first guide bar; 42—second guide bar; 5—feed inlet; 6—feed channel; 7—upper flow channel; 71—first upper flow channel; 72—second upper flow channel; 8—lower flow channel; 81—first lower flow channel; 82—second lower flow channel; 9—merging flow channel. Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] like Figures 1 to 3As shown, the present invention provides a two-strip flow channel in-mold composite extrusion die head, including an upper die 1, an intermediate die 2, a lower die 3, and left and right side plates. The front end of the intermediate die 2 is connected to an intermediate die insert 4, and the rear end of the intermediate die 2 is provided with a feed port 5 and a feed channel 6. The feed channel 6 splits the flow on both sides of the upper die 1 and the lower die 3 to form an upper flow channel 7 and a lower flow channel 8. The upper flow channel 7 flows through the interface between the upper die 1 and the intermediate die 2 and reaches the front end of the top of the intermediate die insert 4. The lower flow channel 8 flows through the interface between the lower die 3 and the intermediate die 2 and reaches the front end of the bottom of the intermediate die insert 4. After being combined and extruded through the front converging flow channel 9, the raw material is provided with a series of parallel and equally spaced first guide strips 41 that are inclined to the left or right. The front end of the bottom of the intermediate die insert 4 is provided with a series of parallel and equally spaced second guide strips 42 that are inclined to the right or left. The raw material is extruded at the converging flow channel 9 to form a composite layer of raw material with upper and lower layers that are inclined and intersecting each other.

[0015] Based on the above scheme, the upper and lower surfaces of the front end of the intermediate mold insert 4 are conical surfaces. The upper flow channel 7 includes a first upper flow channel 71 located between the upper mold 1 and the intermediate mold 2, and a second upper flow channel 72 located between the upper mold 1 and the intermediate mold insert 4. The lower flow channel 8 includes a first lower flow channel 81 located between the lower mold 3 and the intermediate mold 2, and a second lower flow channel 82 located between the lower mold 3 and the intermediate mold insert 4. A portion of the raw material passes through the first upper flow channel 71 and the second upper flow channel 72, and then enters the upper layer of the converging flow channel 9 after being tilted to one side by the first guide bar 41. Another portion of the raw material passes through the first lower flow channel 81 and the second lower flow channel 82, and then enters the lower layer of the converging flow channel 9 after being tilted to the other side by the second guide bar 42. The same raw material forms an inclined cross structure in the upper and lower layers.

[0016] The tilt angle of the first guide strip 41 and the second guide strip 42 is 30° to 60°, and the optimal tilt angle is 45°.

[0017] Furthermore, the first guide strip 41 and the second guide strip 42 have the same inclination angle, and the front ends of the second guide strip 42 and the first guide strip 41 are staggered from each other. The spacing between the second guide strips 42 is the same as the spacing between the first guide strips 41. Specifically, the front end of the second guide strip 42 corresponds to the midpoint between the front ends of two adjacent first guide strips 41, and similarly, the front end of the first guide strip 41 corresponds to the midpoint between the front ends of two adjacent second guide strips 42. This allows for a tighter cross-linking when the upper and lower layers of raw materials are compounded, resulting in better lateral performance.

[0018] In use, molten LCP raw material enters the feed channel 6 through the feed port 5. During its forward flow, it splits into two parts. One part of the raw material flows upward into the first upper flow channel 71 located between the upper mold 1 and the intermediate mold 2, and then into the second upper flow channel 72 located between the upper mold 1 and the intermediate mold insert 4. Guided by the first guide bar 41 at the front end of the intermediate mold insert 4, it tilts to one side and enters the upper region of the confluence flow channel 9. The other part of the raw material flows downward into the first lower flow channel 81 located between the lower mold 3 and the intermediate mold 2, and then into the second lower flow channel 82 located between the lower mold 3 and the intermediate mold insert 4. Guided by the second guide bar 42 at the front end of the intermediate mold insert 4, it tilts to the other side and enters the lower region of the confluence flow channel 9. The same LCP raw material is used to achieve upper and lower layer composite in the confluence channel 9. The upper layer flows in a uniform direction and tilts to the left, while the lower layer flows in a uniform direction and tilts to the right, forming an upper and lower layer cross structure. Alternatively, the upper layer flows in a uniform direction and tilts to the right, while the lower layer flows in a uniform direction and tilts to the left, forming an upper and lower layer cross structure. Finally, an LCP film with an upper and lower layer cross structure is extruded, which can meet the comprehensive requirements of transverse and longitudinal properties.

[0019] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical principles of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A composite extrusion die head with a two-slot flow channel, comprising an upper die (1), an intermediate die (2), a lower die (3), and left and right side plates, characterized in that: The intermediate mold (2) is connected to an intermediate mold insert (4) at its front end. The intermediate mold (2) is provided with a feed inlet (5) and a feed channel (6) at its rear end. The feed channel (6) splits into an upper flow channel (7) and a lower flow channel (8) on both sides of the upper mold (1) and the lower mold (3). The upper flow channel (7) flows through the interface between the upper mold (1) and the intermediate mold (2) and reaches the front end of the top of the intermediate mold insert (4). The lower flow channel (8) flows through the interface between the lower mold (3) and the intermediate mold (2) and reaches the front end of the top of the intermediate mold insert (4). The material is extruded through the bottom front end of the intermediate mold insert (4) and after being combined with the upper and lower confluence channel (9) in front. The top front end of the intermediate mold insert (4) is provided with a series of parallel and equally spaced first guide strips (41) that are inclined to the left or right. The bottom front end of the intermediate mold insert (4) is provided with a series of parallel and equally spaced second guide strips (42) that are inclined to the right or left. The material is extruded into a composite layer of material with the upper and lower layers inclined and intersecting each other at the confluence channel (9).

2. The in-mold composite extrusion die with a two-strip flow channel as described in claim 1, characterized in that: The upper and lower surfaces of the front end of the intermediate mold insert (4) are conical. The upper flow channel (7) includes a first upper flow channel (71) located between the upper mold (1) and the intermediate mold (2) and a second upper flow channel (72) located between the upper mold (1) and the intermediate mold insert (4). The lower flow channel (8) includes a first lower flow channel (81) located between the lower mold (3) and the intermediate mold (2) and a second lower flow channel (82) located between the lower mold (3) and the intermediate mold insert (4). A portion of the raw material passes through the first upper flow channel (71) and the second upper flow channel (72) and then enters the upper layer of the converging flow channel (9) by tilting to one side through the first guide bar (41). Another portion of the raw material passes through the first lower flow channel (81) and the second lower flow channel (82) and then enters the lower layer of the converging flow channel (9) by tilting to the other side through the second guide bar (42). The same raw material forms an inclined cross structure in the upper and lower layers.

3. The in-mold composite extrusion die head with a two-strip flow channel as described in claim 1, characterized in that: The tilt angle of the first guide strip (41) and the second guide strip (42) is 30°–60°.

4. The in-mold composite extrusion die head with a two-strip flow channel as described in claim 1, characterized in that: The first guide strip (41) and the second guide strip (42) have the same tilt angle. The front ends of the second guide strip (42) and the front ends of the first guide strip (41) are staggered in sequence. The spacing between the second guide strips (42) and the spacing between the first guide strips (41) are the same.

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