A pp decorative film casting machine

Abstract

This utility model specifically relates to a PP decorative film casting machine, including a connecting mechanism and a lifting mechanism. The connecting mechanism includes a melt extrusion mechanism, a die head body, a bipolar high-efficiency cooling mechanism, and a winding mechanism. During operation, the melt extrusion mechanism melts raw material particles into a melt and extrudes it. The die head body has a feed pipe on one side connected to the output end of the melt extrusion mechanism and a discharge lip on the other side. The bipolar high-efficiency cooling mechanism is located on the side of the die head body near the discharge lip. The bipolar high-efficiency cooling mechanism includes a small-diameter rapid cooling roller near the discharge lip and a large-diameter heat-insulating slow cooling roller located at the rear end of the small-diameter rapid cooling roller. The winding mechanism is located on the side of the bipolar high-efficiency cooling mechanism away from the die head body and winds up the cooled and formed decorative film during operation, solving the problem of low cooling efficiency, which easily leads to low production quality.

Description

Technical Field

[0001] This utility model relates to the technical field of PP film production equipment, specifically a PP decorative film casting machine. Background Technology

[0002] PP decorative film casting machine is a high-molecular material processing equipment for the professional production of polypropylene (PP) decorative films. Its core principle is to produce films with uniform thickness, smooth surface and excellent optical properties through a continuous process of melt extrusion, casting molding and rapid cooling. These films are widely used in furniture veneers, building material coatings, electronic product casing decoration, automotive interiors and other fields.

[0003] However, existing PP decorative film casting machines are not very efficient at cooling the melt during operation. Insufficient cooling leads to decreased film transparency, insufficient stiffness, and adhesion after winding. Excessive cooling results in high energy consumption and is prone to internal stress warping, thus significantly reducing production quality. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0005] Therefore, the purpose of this utility model is to provide a PP decorative film casting machine to replace the traditional PP decorative film cooling method, thereby avoiding the problem of low cooling efficiency, which easily leads to low production quality.

[0006] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0007] A PP decorative film casting machine, comprising:

[0008] The melt extrusion mechanism melts raw material particles into a melt and then extrudes them during operation.

[0009] The die head body has a feed pipe on one side connected to the output end of the melt extrusion mechanism and a discharge lip on the other side;

[0010] A dual-stage high-efficiency cooling mechanism is located on the side of the die head body near the discharge lip. The dual-stage high-efficiency cooling mechanism includes a small-diameter rapid cooling roller near the discharge lip and a large-diameter heat-insulating and slow cooling roller located at the rear end of the small-diameter rapid cooling roller.

[0011] The winding mechanism is located on the side of the bipolar high-efficiency cooling mechanism away from the mold head body and winds up the cooled and formed decorative film during operation.

[0012] As a preferred embodiment of the PP decorative film casting machine described in this utility model, the die head body has a multi-stage tapered flow divider cone inside the die cavity, wherein the tip of the multi-stage tapered flow divider cone faces the feed pipe.

[0013] As a preferred embodiment of the PP decorative film casting machine of this utility model, the inner walls of the mold cavity of the mold head body are symmetrically provided with arc-shaped guide blocks located at the ends of the multi-stage tapered flow divider cone.

[0014] As a preferred embodiment of the PP decorative film casting machine described in this utility model, multiple independently controlled micro electromagnetic induction heating units and high-response micro thermocouples are embedded at equal intervals inside the die head body along the length direction of the discharge lip.

[0015] As a preferred embodiment of the PP decorative film casting machine described in this utility model, the bipolar high-efficiency cooling mechanism further includes a high-pressure air knife located on the side wall of the die head body and above the small-diameter rapid cooling roller.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: the small roller diameter of this PP decorative film casting machine provides high surface linear velocity and high centrifugal force, which allows the molten film to quickly adhere to the roller surface. The small curvature brings high cooling intensity, realizing instantaneous rapid cooling of the PP film surface to below the crystallization temperature, locking the amorphous structure, and improving transparency and surface smoothness. The large roller diameter heat-insulating and slow-cooling roller provides a long contact time, allowing the PP film to slowly complete the crystallization process under controlled conditions, releasing internal stress, improving dimensional stability, reducing warping and adhesion, and maintaining high stiffness. It replaces the traditional PP decorative film cooling method and avoids the problem of low cooling efficiency, which easily leads to poor production quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1 This is a schematic diagram of the structure of a PP decorative film casting machine according to one perspective of the present invention;

[0019] Figure 2This is a schematic diagram of the structure of a PP decorative film casting machine according to another perspective of the present invention;

[0020] Figure 3 This is a cross-sectional view of the die head body of a PP decorative film casting machine according to the present invention.

[0021] In the diagram: 100, melting extrusion mechanism; 200, die head body; 210, feed pipe; 220, multi-stage tapered flow divider cone; 230, arc-shaped guide block; 300, bipolar high-efficiency cooling mechanism; 310, small diameter rapid cooling roller; 320, large diameter heat-insulating slow cooling roller; 330, high-pressure air knife; 400, winding mechanism. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0025] This invention provides a PP decorative film casting machine that replaces the traditional PP decorative film cooling method, avoiding the problem of low cooling efficiency, which easily leads to poor production quality.

[0026] Figures 1-3 The diagram shown is a structural schematic of a PP decorative film casting machine according to this utility model. Please refer to [link / reference]. Figures 1-3 This article provides a detailed introduction to this type of PP decorative film casting machine.

[0027] Example 1

[0028] refer to Figures 1-3 This utility model discloses a PP decorative film casting machine, the main body of which includes a melt extrusion mechanism 100, a die head body 200, a dual-machine high-efficiency cooling mechanism and a winding mechanism 400.

[0029] The melt extrusion mechanism 100 is used to heat and melt the raw material particles and then extrude the melt into the die head body 200. When the melt extrusion mechanism 100 is working, it melts the raw material particles into a melt and extrudes it.

[0030] The die head body 200 is used to uniformly spread and extrude the melt. The die head body 200 has a feed pipe 210 on one side connected to the output end of the melt extrusion mechanism 100 and a discharge lip on the other side. The feed pipe 210 is used to facilitate the melt extrusion mechanism 100 to introduce the melt into the die cavity of the die head body 200, and the discharge lip is used to uniformly spread and discharge the melt.

[0031] The bipolar high-efficiency cooling mechanism 300 is used to improve the cooling efficiency of the discharged melt, thereby improving production quality. The bipolar high-efficiency cooling mechanism 300 is located on the side of the die head body 200 near the discharge lip. The bipolar high-efficiency cooling mechanism 300 includes a small-diameter rapid cooling roller 310 near the discharge lip and a large-diameter heat-insulating slow cooling roller 320 located at the rear end of the small-diameter rapid cooling roller 310. The small-diameter rapid cooling roller 310 is used to provide high surface linear velocity and high centrifugal force at high linear velocity, so that the melt film quickly adheres to the roller surface. The small curvature brings high cooling intensity, realizing instantaneous rapid cooling of the PP film surface to below the crystallization temperature, locking the amorphous structure, and improving transparency and surface smoothness. The large-diameter heat-insulating slow cooling roller 320 is used to provide a long contact time. Its internal partition temperature control system can set a suitable temperature gradient, so that the PP film slowly completes the crystallization process under controlled conditions, releasing internal stress, improving dimensional stability, reducing warping and adhesion, and maintaining high stiffness. At the same time, the large roller diameter itself also provides a good flattening effect.

[0032] The winding mechanism 400 is used to wind up the cooled and formed decorative film. The winding mechanism 400 is located on the side of the bipolar high-efficiency cooling mechanism 300 away from the mold head body 200 and winds up the cooled and formed decorative film during operation.

[0033] In this embodiment, the specific usage process is as follows: raw material particles are added into the melting extrusion mechanism 100. After the melting extrusion mechanism 100 melts the raw material particles, the melt is extruded into the mold cavity of the die head body 200 through the feed pipe 210. Then, the melt curtain is formed through the discharge lip and discharged. After the high temperature melt curtain is cooled by the dual-stage high-efficiency cooling mechanism, the formed PP decorative mold is obtained. Then, it is wound up by the winding mechanism 400.

[0034] Example 2

[0035] Based on Example 1, the die head body 200 has a multi-stage tapered flow divider cone 220 in the die cavity, wherein the tip of the multi-stage tapered flow divider cone 220 faces the feed pipe 210, which is used to distribute the melt smoothly and symmetrically to the entire width of the die head and avoid accumulation in the center.

[0036] In this embodiment, arc-shaped guide blocks 230 are symmetrically arranged on both sides of the inner wall of the mold cavity of the die head body 200 at the end of the multi-stage tapered flow divider cone 220. These blocks are used to guide the melt to turn smoothly using their large curvature arc surface, eliminating the flow dead zone and vortex generated by right-angle or small-angle turns, greatly reducing the melt residence time, preventing local overheating and degradation of PP, and reducing crystal points.

[0037] In this embodiment, multiple independently controlled miniature electromagnetic induction heating units and high-response miniature thermocouples (not shown in the figure) are embedded at equal intervals along the length of the discharge lip inside the die head body 200. The miniature electromagnetic induction heating units and high-response miniature thermocouples are embedded in specific positions inside the die head body 200 through precision-machined channels, ensuring that the heating source is close to the working surface of the discharge lip and that the temperature measurement point of the high-response miniature thermocouple is accurate. The leads of all independently controlled miniature electromagnetic induction heating units and high-response miniature thermocouples are connected to an independent multi-channel intelligent temperature controller. Electromagnetic induction heating is direct and fast, heating the local metal of the die head, and the thermal efficiency is far superior to that of traditional resistance / oil heating. The miniature thermocouples provide real-time and accurate feedback on the temperature of the corresponding zone of the die lip. Based on the thermocouple feedback, the intelligent temperature controller performs PID closed-loop control on each heating unit, realizing ultra-precise temperature zone control along the entire length of the discharge lip, and completely eliminating the uneven thickness and gloss caused by lateral temperature differences.

[0038] In this embodiment, the bipolar high-efficiency cooling mechanism 300 also includes a high-pressure air knife 330 located on the side wall of the die head body 200 and above the small diameter quench roller 310, which is used to press the high-temperature melt curtain onto the surface of the small diameter quench roller 310 to ensure good initial contact and heat conduction.

[0039] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A PP decorative film casting machine characterized by, include: The melt extrusion mechanism (100) melts the raw material particles into a melt and extrudes them during operation; The die head body (200) has a feed pipe (210) on one side connected to the output end of the melt extrusion mechanism (100) and a discharge lip on the other side; A bipolar high-efficiency cooling mechanism (300) is located on the side of the die head body (200) near the discharge lip. The bipolar high-efficiency cooling mechanism (300) includes a small-diameter rapid cooling roller (310) near the discharge lip and a large-diameter heat-insulating slow cooling roller (320) located at the rear end of the small-diameter rapid cooling roller (310). The winding mechanism (400) is located on the side of the bipolar high-efficiency cooling mechanism (300) away from the mold head body (200) and winds up the cooled decorative film during operation.

2. The PP-decorating film casting machine according to claim 1, characterized in that, The die head body (200) has a multi-stage tapered flow divider cone (220) inside the die cavity, wherein the tip of the multi-stage tapered flow divider cone (220) faces the feed pipe (210).

3. The PP-decorating film casting machine according to claim 2, characterized in that, The inner walls of the mold cavity of the mold head body (200) are symmetrically provided with arc-shaped guide blocks (230) located at the ends of the multi-stage tapered flow divider cone (220).

4. The PP-decorating film casting machine according to claim 1, characterized in that, Multiple independently controlled micro electromagnetic induction heating units and high-response micro thermocouples are embedded at equal intervals inside the die head body (200) along the length direction of the discharge lip.

5. The PP-decorating film casting machine according to claim 1, characterized in that, The bipolar high-efficiency cooling mechanism (300) also includes a high-pressure air knife (330) located on the side wall of the die head body (200) and above the small-diameter quenching roller (310).

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