CN212666648U

CN212666648U - Perforated plate for extruder

Info

Publication number: CN212666648U
Application number: CN202021151349.2U
Authority: CN
Inventors: 王雪; 查尚文; 李海祥; 许文魁; 罗健
Original assignee: Shanghai Eco Precision Extrusion Technology Co ltd
Current assignee: Shanghai Eco Precision Extrusion Technology Co ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-03-09
Anticipated expiration: 2030-06-19

Abstract

The application provides a perforated plate for extruder includes: a body, the body comprising: a feed layer and a discharge layer. The feeding layer is provided with a plurality of feeding holes which are annularly distributed along the center of the body in a plurality of circles. The ejection of compact layer is provided with the discharge opening, the discharge opening with the feed port intercommunication forms the through-hole that runs through whole perforated plate body. The discharge hole at the outermost ring is an annular through hole. When the melt flows through the perforated plate, the shear heat experienced by the melt at the outermost ring is reduced and the melt is fused into a ring shape before flowing out of the perforated plate, thereby replacing the multi-strand discharge of the existing single-layer perforated plate in a ring discharge mode. The appearance defects of vertical stripes and the like along the extrusion direction generated by the product are eliminated, and the appearance quality of the formed product is improved.

Description

Perforated plate for extruder

Technical Field

The application relates to the technical field of dies, in particular to a porous plate for an extruder.

Background

The perforated plate, also called as a flow distribution plate, is arranged between the machine head and the charging barrel. After the plastic melt is homogenized by the screw homogenizing section, the plastic melt enters the machine head through the porous plate. After the melt passes through the perforated plate, the movement is converted from the original spiral movement into linear movement. Because the perforated plate has a certain aperture ratio, when the melt enters the holes of the perforated plate, the melt enters a small-aperture cross section from a large-aperture cross section, the advancing resistance of the melt is increased, and the back pressure of the melt is increased. The high melt back pressure allows the material to stay in the barrel for a longer time, and thus the plasticizing quality is improved.

The existing porous plate is of a single-layer structure, through holes are uniformly or unevenly distributed on the porous plate, and the through holes are of a cylindrical structure. In the process that the plastic melt flows through the porous plate, as the flow velocity of the melt is increased, high shear heat is generated on the surface layer of each material flow which is in contact with the hole wall of the porous plate, and the high shear heat applied to the surface layer can cause the appearance defects of regular vertical stripes and the like along the extrusion direction on the outer surface of an extruded product, so that the product has poor apparent quality.

SUMMERY OF THE UTILITY MODEL

The application provides a perforated plate for extruder to solve the technical problem that vertical stripe appears in the plastic products epidermis, influences the goods outward appearance.

In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:

the embodiment of the application discloses perforated plate for extruder includes: a body, the body comprising: a feed layer and a discharge layer; the feeding layer is provided with a plurality of feeding holes which are annularly distributed along the center of the body in a plurality of circles.

The discharging layer is provided with a discharging hole, the discharging hole is communicated with the feeding hole, and the discharging hole at the outermost circle is an annular through hole.

Optionally, the discharge hole is an annular through hole or an arc-shaped through hole except for the outermost ring.

Optionally, the outermost ring of the feeding hole is a tapered hole; the big end of the conical hole is a feeding end.

Optionally, the thickness of the feed layer accounts for 1/3 or more of the thickness of the body.

Optionally, the feed layer and the discharge layer are of an integrated structure.

Optionally, the cross-sectional area of the discharge end of the outermost ring of discharge holes is smaller than or equal to the cross-sectional area of the feed end of the feed hole communicated with the discharge end of the outermost ring of discharge holes.

Optionally, the feeding holes are uniformly distributed along the center of the body in a multi-circle annular shape.

Optionally, the method further includes: the transition layer is provided with a plurality of transition holes and is arranged between the material feeding layer and the material discharging layer; the transition hole is of a conical structure, and the large end of the transition hole is connected with the feeding hole.

Compared with the prior art, the beneficial effect of this application is:

the application provides a perforated plate for extruder includes: a body, the body comprising: a feed layer and a discharge layer. The feeding layer is provided with a plurality of feeding holes which are annularly distributed along the center of the body in a plurality of circles. The perforated plate is arranged at the joint of the machine head and the charging barrel, and melt back pressure is established at the position of the melt in front of the homogenizing section of the charging barrel and the perforated plate due to the blocking of the feeding material layer before the melt flows through the perforated plate. The ejection of compact layer is provided with the discharge opening, the discharge opening with the feed port intercommunication forms the through-hole that runs through whole perforated plate body. The discharge hole at the outermost ring is an annular through hole. When the melt flows through the perforated plate, the melt at the outermost circle firstly disperses the material flow into a plurality of strands through the feeding holes of the material feeding layer, and the rotary motion of the material flow is converted into linear motion. Immediately after flowing through the discharge layer, the circumferentially oriented streams of the outermost ring merge into a ring. After flowing out of the perforated plate, all the material flows are converged to form one material flow.

The application provides a perforated plate for extruder, not only realized changing the material stream into linear motion and the effect that increases the fuse-element backpressure by rotary motion, moreover because the shearing heat that produces when the material stream passes through the perforated plate reduces, its outermost circle material stream just has fused the circularity before the play perforated plate, thereby replaced the multi-strand ejection of compact of current individual layer perforated plate with annular ejection of compact mode, eliminated the product and produced surface appearance defects such as vertical stripe along the direction of extrusion, improved the apparent quality of shaping goods.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a front view of a breaker plate for an extruder provided in example 1 of the present application;

FIG. 2 is a sectional view A-A of a breaker plate for the extruder shown in FIG. 1;

FIG. 3 is a rear view of the breaker plate for the extruder shown in FIG. 1;

FIG. 4 is a front view of a breaker plate for an extruder provided in example 2 of the present application;

FIG. 5 is a sectional view B-B of the breaker plate for the extruder shown in FIG. 4;

FIG. 6 is a rear view of the breaker plate for the extruder shown in FIG. 4;

FIG. 7 is a schematic perspective view of a breaker plate for the extruder shown in FIG. 4;

the material feeding device comprises a body 1, a material feeding layer 11, a material discharging layer 12, a transition layer 13, a material feeding hole 111, a material discharging hole 121 and a transition hole 131.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1

Referring to fig. 1 to 3, fig. 1 is a front view of a breaker plate for an extruder according to example 1, and fig. 2 is a sectional view of the breaker plate for an extruder shown in fig. 1 taken along a line a-a, in which the direction of an arrow indicates a melt flow direction. Fig. 3 is a rear view of the breaker plate for the extruder shown in fig. 1. The embodiment of the application provides a perforated plate for extruder includes: a body 1, said body 1 comprising: a feed layer 11 and a discharge layer 12.

The feeding layer 11 is provided with a plurality of feeding holes 111, the feeding holes 111 are annularly distributed along the center of the body 1 in a plurality of circles, and the outermost circle of the feeding holes 111 is a conical hole; the big end of the conical hole is a feeding end. As shown in fig. 2.

The discharging layer 12 is provided with a discharging hole 121, the discharging hole 121 is communicated with the feeding hole 111, and the discharging hole 121 at the outermost ring is an annular through hole. The inner discharging hole can be a cylindrical through hole and can also be an annular or arc-shaped through hole. The arc through hole is an arc discharging structure connected with a plurality of adjacent feeding holes. The circle centers of the arc-shaped through holes and the outermost ring of annular through holes are the same and are the same as the circle center of the body. As shown in fig. 3, in this embodiment, the inner discharging holes are also arranged in a ring shape, and the ring-shaped discharging holes are in a concentric circle structure.

The perforated plate is arranged at the joint of the machine head and the charging barrel, and melt back pressure is established at the position of the melt in front of the homogenizing section of the charging barrel and the perforated plate due to the blocking of the feeding material layer before the melt flows through the perforated plate. The ejection of compact layer is provided with the discharge opening, the discharge opening with the feed port intercommunication forms the through-hole that runs through whole perforated plate body. The discharge hole at the outermost ring is an annular through hole. When the melt flows through the perforated plate, the material flow is first divided into a plurality of strands by the conical holes of the material feed layer, and the rotational movement of the material flow is converted into a linear movement. Immediately after the discharge layer, the circumferentially continuous streams merge into a ring. After flowing out of the perforated plate, all the annular material flows are converged to form a material flow.

In order to ensure the firmness of the porous plate, the material feeding layer 11 and the material discharging layer 12 are of an integral structure. Meanwhile, the integral porous plate avoids the problem that a gap exists between two layers or between multiple layers of formed materials, and then the melt is remained.

The thickness of the feed material layer 11 accounts for 1/3 or more of the thickness of the body 1. Avoid the undersize of feed layer 11, cause the perforated plate intensity to reduce, influence the life of perforated plate body.

When the cross-sectional area of the outermost ring-shaped structure of the discharging layer 12 is smaller than the sum of the cross-sectional areas of the feeding ends of the feeding holes communicated with the discharging layer, the discharging layer plays a role in compacting the melt. Therefore, in this embodiment, the discharge end cross-sectional area of the discharge hole 121 on the outermost ring is smaller than the feed end cross-sectional area of the feed hole 111 communicated therewith.

In order to prevent the end face of the feeding end from generating material accumulation when the melt flows through the porous plate, the feeding holes 111 are uniformly distributed along the center of the body 1 in a multi-circle annular shape.

The perforated plate for the extruder provided by the embodiment not only realizes the effect of converting the material flow from rotary motion to linear motion and increasing the melt backpressure, but also eliminates the apparent defects such as vertical stripes in the extrusion direction and the like generated by the product and improves the apparent quality of the product because the shearing heat generated in the process of passing through the perforated plate is reduced in the outermost layer of the material flow and the outermost ring of melt is fused into a ring before passing through the perforated plate. And the circumferential strength, the impact resistance, the burst pressure resistance and other mechanical properties of the molded product are improved.

Example 2

Referring to fig. 4 to 6, fig. 4 is a front view of a breaker plate for an extruder according to example 2, and fig. 5 is a B-B cross-sectional view of the breaker plate for an extruder shown in fig. 4, in which the direction of an arrow indicates a melt flow direction. Fig. 6 is a rear view of the breaker plate for the extruder shown in fig. 4. The embodiment of the application provides a perforated plate for extruder includes: a body 1, said body 1 comprising: a feed layer 11, a discharge layer 12 and a transition layer 13.

The feed layer 11 is provided with a plurality of feed holes 111, the feed holes 111 are distributed along the center of the body 1 in a multi-circle annular manner, and the outermost circle of the feed holes 111 is a cylindrical through hole. The transition layer 13 is provided with a plurality of transition holes 131, and the transition layer is arranged between the feeding layer and the discharging layer. The transition hole is of a conical structure, and the large end of the transition hole 131 is connected with the feeding hole 111. The discharging layer 12 is provided with a discharging hole 121, the discharging hole 121 is communicated with the feeding hole 111, and the discharging hole 121 is an annular through hole. Preferably, the width of the circular ring of the discharging hole 121 of the discharging layer at the outermost circle is the same as the small diameter of the transition hole 131.

The perforated plate provided by the embodiment is arranged at the joint of the machine head and the charging barrel, and before the melt flows through the perforated plate, melt back pressure is established at the position of the homogenizing section of the charging barrel and in front of the perforated plate due to the blocking of the feeding material layer 11 of the perforated plate. When the melt flows through the perforated plate, the material flow is first divided into a plurality of strands by the inlet openings 111 of the material feed layer, and the rotational movement of the material flow is converted into a linear movement. The flow is further compacted during the flow of the melt through the transition openings 131 of the transition layer 13. The existence of the conical structure realizes streamline transition between layers. The streams which are stranded in each circumferential direction merge into a ring when they flow through the outfeed layer 12. After the porous plate is discharged, all the annular material flows are converged. The existence of transition layer for the transition of fuse-element in the multiply wood is more smooth and easy, reduces and hinders, helps reducing the fuse-element residue on the perforated plate.

In order to prevent the melt from remaining between layers of the porous plate, the porous plate body is of an integrally formed structure.

As shown in fig. 7, in this embodiment, all the discharge holes are annular through holes. When the melt flows through the perforated plate, the melt is first dispersed into a plurality of strands while passing through the feed material layer, and the rotational motion of the material flow is converted into a linear motion. The flow is further compacted by compression during passage through the tapered transition holes 131 of the transition layer 13. The existence of the conical structure realizes streamline transition between layers. When the material flows through the discharging layer, the material flows which are stranded in the circumferential direction are fused into a ring shape, and the ring-shaped material flows are converged after the material flows out of the porous plate. Because the melt is fused into a ring shape before flowing out of the porous plate, the multi-strand discharging mode of the existing single-layer porous plate is replaced by a ring discharging mode. The appearance defects of vertical stripes and the like along the extrusion direction generated by the product are eliminated, and the appearance quality of the formed product is improved. The circumferential strength, the impact resistance, the burst pressure resistance and other mechanical properties of the molded product are improved; in addition, the porous plate is layered, and the discharging layer is provided with an annular structure, so that residual melt on the porous plate can be cleaned more easily.

Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.

It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

The above-described embodiments of the present application do not limit the scope of the present application.

Claims

1. A breaker plate for an extruder, comprising: a body (1), the body (1) comprising: a feeding layer (11) and a discharging layer (12);

the feeding layer (11) is provided with a plurality of feeding holes (111), and the feeding holes (111) are annularly distributed along the center of the body (1) in a plurality of circles;

the discharging layer (12) is provided with a discharging hole (121), the discharging hole (121) is communicated with the feeding hole (111), and the discharging hole (121) at the outermost ring is an annular through hole.

2. A breaker plate for an extruder according to claim 1 wherein the discharge openings (121) are circular or arc-shaped except for the outermost turn.

3. A breaker plate for an extruder according to claim 1 wherein the outermost periphery of said feed holes (111) is a tapered hole; the big end of the conical hole is a feeding end.

4. Breaker plate for extruders according to claim 1, characterized in that the thickness of the feed material layer (11) is greater than or equal to 1/3 of the thickness of the body (1).

5. A breaker plate for extruders according to claim 1 characterized in that the feed layer (11) and the discharge layer (12) are of one-piece construction.

6. A breaker plate for an extruder according to claim 1 wherein the cross-sectional area of the discharge end of the outermost discharge hole is smaller than or equal to the cross-sectional area of the feed end of the feed hole communicating therewith.

7. Breaker plate for extruders according to claim 1, characterized in that the feed holes (111) are evenly distributed in a plurality of circles around the center of the body (1).

8. The breaker plate for an extruder of claim 1, further comprising: the transition layer (13) is provided with a plurality of transition holes (131), and the transition layer is arranged between the feeding layer and the discharging layer; the transition hole is of a conical structure, and the large end of the transition hole (131) is connected with the feeding hole (111).