Perforated plate for improving plasticizing performance of PVC-U (unplasticized polyvinyl chloride) pipe
By designing the feed end of the perforated plate to be a cone with multiple apertures and embedding heating wires, the problem of melt fracture caused by traditional perforated plates was solved, achieving uniform plasticization and temperature control of PVC-U pipes and improving product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ZHONGCAI PIPELINE DERIVATIVES CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-04-17
AI Technical Summary
Traditional perforated sheets cause uneven melt shear force in PVC-U pipe processing, which can easily lead to melt fracture and decomposition, affecting the uniformity of product wall thickness.
The feed end of the perforated plate is designed to be tapered with multiple apertures, and the extrusion holes gradually increase in size from the inner ring to the outer ring. Heating wires are embedded in the perforated plate to achieve zoned temperature control and ensure uniform melt temperature.
It effectively reduces melt pressure, prevents melt cracking and aging, improves melt plasticization, and ensures uniform pipe wall thickness.
Smart Images
Figure CN224130422U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of PVC manufacturing technology, and in particular relates to a porous plate that improves the plasticizing performance of PVC-U pipes. Background Technology
[0002] PVC was once the world's most produced general-purpose plastic, with a very wide range of applications. It is widely used in building materials, industrial products, daily necessities, flooring, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, and fibers, bringing great convenience to people.
[0003] PVC materials undergo complex rheological processes such as melting, mixing, and shearing during extrusion. To improve the plasticizing properties of the product, perforated plates are used at the extrusion nozzle in the processing of some products. However, traditional perforated plates use a single aperture design, which can easily lead to uneven shear force distribution. This can cause localized fractures and decomposition of the melt during extrusion, and also result in deviations in the wall thickness of the final pipe product. Utility Model Content
[0004] The purpose of this invention is to address the aforementioned technical problems by providing a porous plate that improves the plasticizing properties of PVC-U pipes, thereby preventing melt fracture leading to decomposition and aging when the melt enters the porous plate.
[0005] In view of this, the present invention provides a perforated plate for improving the plasticizing performance of PVC-U pipes, comprising a plate body, one side of which is a feeding end and the other side is a discharging end. The feeding end of the plate body is concave and conical towards the discharging end. Multiple extrusion holes are provided through the plate body along the axial direction. The extrusion holes are arranged in multiple circles around the axis of the plate body, and the diameter of the extrusion holes gradually increases from the inner circle to the outer circle.
[0006] In this technical solution, the feed end of the perforated plate is designed as a cone with multiple apertures, which not only enhances the plasticization of the melt by the perforated plate, but also effectively reduces the melt pressure and prevents the melt from breaking down and decomposing when it enters the perforated plate.
[0007] Furthermore, the taper of the cone is between 15° and 20°.
[0008] Furthermore, the diameter of the extrusion orifice gradually increases from the inner ring to the outer ring, forming an arithmetic sequence.
[0009] Furthermore, the outermost extrusion hole gradually tilts away from the axis of the plate from the feed end to the discharge end.
[0010] In this technical solution, the density of the extrusion holes at the feed end is higher than the distribution density of the extrusion holes at the discharge end, which further reduces the melt pressure and prevents the melt from breaking down and decomposing when it enters the porous plate.
[0011] Furthermore, the inclination angle of the outermost extrusion orifice is between 8° and 12°.
[0012] Furthermore, multiple heating wires are embedded in the perforated plate in different sections.
[0013] In this technical solution, the heating wire of the perforated plate is embedded in the perforated plate body, which can achieve the function of zoned temperature control, and the melt temperature can be kept uniform through zoned temperature control.
[0014] Furthermore, a heating wire is arranged around the periphery of each extrusion hole.
[0015] Furthermore, the distance from the heating wire to the nearest extrusion hole is 5 mm.
[0016] Furthermore, the heating wires of each coil are positioned at different points along the axial direction of the plate, with the outermost coil closer to the feed end and the innermost coil closer to the discharge end.
[0017] Furthermore, the end of each heating wire extends beyond the outside of the plate.
[0018] The beneficial effects of this utility model are:
[0019] 1. The feed end of the perforated plate is designed as a cone with multiple apertures, which not only enhances the plasticization of the melt by the perforated plate, but also effectively reduces the melt pressure and prevents the melt from breaking down and decomposing when it enters the perforated plate.
[0020] 2. The outermost extrusion orifice gradually slopes away from the plate axis from the feed end to the discharge end. This ensures that the density of the extrusion orifice at the feed end is higher than that at the discharge end, further reducing melt pressure and preventing melt fracture leading to decomposition and aging when the melt enters the porous plate.
[0021] 3. The heating wire of the perforated plate is embedded in the perforated plate body, which can achieve the function of zoned temperature control, and the melt temperature can be kept uniform through zoned temperature control. Attached Figure Description
[0022] Figure 1 This is a perspective view of the present invention;
[0023] Figure 2 This is a cross-sectional view of the present invention;
[0024] Figure 3 This is a longitudinal sectional view of the present invention;
[0025] The markings in the diagram are as follows:
[0026] 1. Plate body; 2. Feed end; 3. Discharge end; 4. Conical shape; 5. Extrusion hole; 6. Heating wire. Detailed Implementation
[0027] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.
[0028] In the description of this application, 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. 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.
[0029] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0030] It should be noted that in the description of this application, 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 application 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 application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0031] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
[0032] like Figure 1-3 As shown, a perforated plate for improving the plasticizing performance of PVC-U pipes includes a plate body 1, with a feed end 2 on one side and a discharge end 3 on the other side. The feed end 2 of the plate body 1 is concave to the discharge end 3 in a conical shape 4. Multiple extrusion holes 5 are provided on the plate body 1 along the axial direction. The extrusion holes 5 are arranged in multiple rings around the axis of the plate body 1, and the diameter of the extrusion holes 5 gradually increases from the inner ring to the outer ring.
[0033] The feed end 2 of the perforated plate is designed as a cone 4 with multiple apertures, which not only enhances the plasticization of the melt by the perforated plate, but also effectively reduces the melt pressure and prevents the melt from breaking down and decomposing when it enters the perforated plate.
[0034] The taper of the cone 4 is between 15° and 20°.
[0035] The diameter of the extrusion orifice 5 gradually increases from the inner ring to the outer ring, forming an arithmetic sequence.
[0036] The outermost extrusion hole 5 gradually tilts away from the axis of the plate body 1 from the feed end 2 to the discharge end 3.
[0037] This ensures that the density of the extrusion hole 5 at the feed end 2 is higher than the distribution density of the extrusion hole 5 at the discharge end 3, further reducing the melt pressure and preventing melt rupture leading to decomposition and aging when the melt enters the perforated plate.
[0038] The outermost extrusion orifice 5 has an inclination angle between 8° and 12°.
[0039] Multiple heating wires 6 are embedded in the perforated plate in different sections.
[0040] The perforated plate heating wire 6 is embedded in the perforated plate body, which can achieve the function of zoned temperature control, and the melt temperature can be kept uniform through zoned temperature control.
[0041] A heating wire 6 is arranged around the periphery of each extrusion hole 5.
[0042] The distance from the heating wire 6 to the nearest extrusion hole 5 is 5 mm.
[0043] The heating wire 6 is positioned at different points along the axis of the plate 1. The outermost heating wire 6 is closer to the feed end 2, and the innermost heating wire 6 is closer to the discharge end 3.
[0044] Each heating wire 6 extends beyond the outer edge of the plate 1 at its end.
[0045] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.
Claims
1. A perforated plate for improving plasticizing properties of PVC-U pipes, characterized in that The plate includes a plate (1), with a feed end (2) on one side and a discharge end (3) on the other side. The feed end (2) of the plate (1) is concave to the discharge end (3) and is cone-shaped (4). Multiple extrusion holes (5) are provided on the plate (1) along the axial direction. The extrusion holes (5) are arranged in multiple rings around the axis of the plate (1). The diameter of the extrusion holes (5) gradually increases from the inner ring to the outer ring.
2. A porous plate for improving plasticizing performance of PVC-U pipes according to claim 1, characterized in that, The taper of the cone (4) is between 15° and 20°.
3. A porous plate for improving plasticizing performance of PVC-U pipes according to claim 1, characterized in that, The diameter of the extrusion hole (5) gradually increases from the inner ring to the outer ring, forming an arithmetic sequence.
4. A porous plate for improving plasticizing performance of PVC-U pipes according to claim 3, characterized in that, The outermost extrusion hole (5) gradually tilts away from the axis of the plate (1) from the feed end (2) to the discharge end (3).
5. A porous plate for improving plasticizing properties of PVC-U pipes according to claim 4, characterized in that, The outermost extrusion hole (5) has an inclination angle between 8° and 12°.
6. A porous plate for improving plasticizing performance of PVC-U pipes according to claim 3, characterized in that, Multiple heating wires (6) are embedded in the perforated plate in different sections.
7. A porous plate for improving plasticizing properties of PVC-U pipes according to claim 6, characterized in that, A heating wire (6) is provided around the periphery of each extrusion hole (5).
8. A porous plate for improving plasticizing properties of PVC-U pipes according to claim 7, characterized in that, The distance from the heating wire (6) to the nearest extrusion hole (5) is 5 mm.
9. A porous plate for improving plasticizing properties of PVC-U pipes according to claim 8, characterized in that, Each heating wire (6) is positioned at different points along the axis of the plate (1), with the outermost heating wire (6) being closer to the feed end (2) and the innermost heating wire (6) being closer to the discharge end (3).
10. A perforated plate for improving plasticizing properties of PVC-U pipes according to claim 9, characterized in that, Each heating wire (6) extends beyond the plate (1) at its end.