CN113771275A

CN113771275A - Novel structure curtain coating die head

Info

Publication number: CN113771275A
Application number: CN202111102865.5A
Authority: CN
Inventors: 陈新辉; 刘新国
Original assignee: Shantou University
Current assignee: Shantou University
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2021-12-10
Anticipated expiration: 2041-09-18
Also published as: CN113771275B

Abstract

The invention discloses a casting die head with a novel structure, which comprises: a die head seat, the top of the die head seat is provided with a feeding film opening, the bottom of the die head seat is provided with a discharging die opening, and the discharging die opening is arranged in left and right directions. The elongated hole structure is extended, and a multi-stage flow channel connecting the feeding membrane port and the discharging die port is arranged inside the die head. The first-stage flow channel includes the first-stage flow channel that communicates with the feeding membrane port and the last-stage flow channel that communicates with the discharge die mouth; wherein, the first-stage flow channel is divided into two to become the second-stage flow channel in the opposite direction. The last-stage flow channel is connected with the discharge die through a gradually-shaped narrow advection channel extending left and right, and the last-stage flow channel is a cavity flow channel with a small upper and a large lower. It is easier to change the extrusion pressure of the melt in the die, meet the requirements of equal pressure drop and isochronism, improve the uniformity of the melt, and effectively improve the uniformity of the film extruded and formed from the discharge die. Reduce thickness deviation.

Description

Novel structure curtain coating die head

Technical Field

The invention relates to a casting die head, in particular to a casting die head with a novel structure.

Background

The casting die is a core forming part of a casting film production device, and has the functions of well distributing plastic melt from an extruder in a die runner so as to uniformly extrude the plastic melt from a die at a certain speed and cooling and forming the plastic melt through a cooling roller, so that a film product with uniform thickness is obtained.

However, existing casting dies suffer from several disadvantages, the first being that the runner distributes the melt less uniformly; secondly, the equal pressure drop cannot be completely met; third is the inability to achieve isochronism (equal residence time of melt in the die from any point). The above disadvantages result in that the extruded and formed film is not satisfactory in uniformity, particularly, the film having a thickness of 0.1 to 0.3mm, resulting in waste of materials. Therefore, further improvements are desired.

Disclosure of Invention

The invention aims to provide a novel structure casting die head, which solves one or more technical problems in the prior art and at least provides a beneficial selection or creation condition.

The technical scheme adopted for solving the technical problems is as follows:

the invention provides a novel structure casting die head, which comprises: the die head comprises a die head seat, wherein a feeding film opening is formed in the top of the die head seat, a discharging die opening is formed in the bottom of the die head seat, a long hole structure is formed in the discharging die opening in a left-right extending mode, a multi-stage runner communicated with the feeding film opening and the discharging die opening is arranged in the die head seat, the multi-stage runner is of a runner structure with more than two stages arranged in sequence from top to bottom, and comprises a first-stage runner communicated with the feeding film opening and a last-stage runner communicated with the discharging die opening; wherein, the former stage runner is divided into two parts to become the latter stage runner with opposite directions; the last stage runner is communicated with the discharging die opening through a tapered narrow flat runner extending from left to right, and the last stage runner is a cavity runner with a small upper part and a big lower part.

The invention has the beneficial effects that: when the device is used, a melt enters from a feeding film port, the melt flows downwards along the arrangement of the multistage runners, wherein a front-stage runner in the multistage runners is divided into two parts and becomes a rear-stage runner in the opposite direction, the extrusion pressure of the melt in a die head can be changed more easily, the equal pressure drop is met, the melt coming out from a last-stage runner of a cavity runner is extruded from a discharging die port after passing through a tapered narrow flat runner, the cavity runner is smaller, the tapered narrow flat runner plays a balancing role, the uniformity of the melt is improved, and meanwhile, the requirement of isochronism is met, so that the uniformity of a thin film extruded and formed by the discharging die port can be effectively improved, and the thickness deviation is reduced.

As a further improvement of the technical scheme, the cross sections of the flow passages on the upper side of the last stage of flow passage are all in a circular structure. This results in a more uniform flow of the melt and a reduced resistance to flow.

As a further improvement of the above technical solution, the final stage flow channel has a horn structure with a small top and a large bottom on the main view projection plane, and the cross section of the final stage flow channel has a flat structure with a large top and a small bottom. So that the final stage flow channels can perform a mixing function.

As a further improvement of the above technical scheme, the die head seat comprises a front die body and a rear die body, the front die body and the rear die body are assembled and connected through bolts, and the feeding film opening, the discharging die opening, the multi-stage runner and the tapered narrow horizontal runner are formed between the front die body and the rear die body.

The die head seat in this embodiment is formed by connecting the front die body and the rear die body, the front die body and the rear die body are mutually attached, grooves are arranged on the surfaces of the front die body and the rear die body, and the grooves on the two sides are symmetrically arranged to form a feeding film opening, a discharging die opening, a multi-stage runner and a tapered narrow and flat runner.

As a further improvement of the above technical scheme, the front mold body and the rear mold body are both provided with a plurality of connecting holes which are communicated with each other in the front and rear direction, and the two corresponding connecting holes in the front and rear direction are connected through the bolt. The plurality of connecting holes can improve the firmness and the tightness of the connection of the front mold body and the rear mold body and avoid the leakage of melt.

Drawings

The invention is further described with reference to the accompanying drawings and examples;

FIG. 1 is a schematic front view of an embodiment of a novel structural casting die according to the present invention;

FIG. 2 is a side view internal schematic of one embodiment of the novel architecture casting die provided by the present invention.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if words such as "a plurality" are described, the meaning is one or more, the meaning of a plurality is two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1-2, the novel construction casting die of the present invention is made as follows:

the novel structure casting die head of the embodiment comprises a die head seat, wherein the die head seat comprises a front die body 700 and a rear die body 800, the front die body 700 and the rear die body 800 are assembled and connected through bolts, grooves are respectively arranged on the surfaces, which are attached to each other, of the front die body 700 and the rear die body 800, the grooves on the two sides are symmetrically arranged to form a feeding film opening 100, a discharging film opening 200, a multi-stage runner and a tapered narrow flat runner 500, the feeding film opening 100 is arranged at the top of the die head seat, the discharging film opening 200 is arranged at the bottom of the die head seat, the discharging film opening 200 extends left and right to form a long strip hole structure, the feeding film opening 100 and the discharging film opening 200 are communicated through the multi-stage runner and the tapered narrow flat runner 500, the multi-stage runner comprises a first stage runner 300 communicated with the feeding film opening 100 and a last stage runner 400 communicated with the discharging film opening 200, when the novel structure casting die head is used, a melt enters from the feeding film opening 100 and flows downwards along the multi-stage runner, the former stage runner is divided into two parts and becomes the latter stage runner with opposite directions, so that the extrusion pressure of the melt in the die head is easier to change, equal pressure drop is met, the last stage runner 400 is communicated with the discharging die orifice 200 through the tapered narrow flat runner 500 extending left and right, the last stage runner 400 is a cavity runner with a small upper part and a large lower part, the melt discharged from the last stage runner 400 of the cavity runner passes through the tapered narrow flat runner 500 and then is extruded from the discharging die orifice 200, the cavity runner is small, the tapered narrow flat runner 500 plays a balance role, the uniformity of the melt is improved, and meanwhile, the requirement of isochronism is met, so that the uniformity of a film extruded and molded by the discharging die orifice 200 can be effectively improved, and the thickness deviation is reduced.

Further, the cross-section of the flow channel at the upper side of the last stage flow channel 400 is a circular structure. This results in a more uniform flow of the melt and a reduced resistance to flow.

The last stage flow channel 400 is in a horn structure with a small top and a large bottom on the main view projection plane, and the cross section of the last stage flow channel 400 is in a flat structure with a large top and a small bottom. So that the final stage flow channels 400 can perform a mixing function. The horn structure has a good mixing effect on the melt, when in extrusion, a part of the melt in the last stage runner 400 vertically flows from the cavity to the tapered narrow flat runner 500, meanwhile, a part of the melt flows to the tapered narrow flat runner 500 along the runner wall, and the melt flows to the discharge die orifice 200 from an outlet formed by two inclined planes in the tapered narrow flat runner 500 and is extruded from the discharge die orifice 200.

In this embodiment, the front mold body 700 and the rear mold body 800 are both provided with a plurality of connecting holes 600 penetrating in the front and rear directions, and the two corresponding connecting holes 600 are connected by bolts. The plurality of connection holes 600 may improve the firmness and sealing of the connection between the front mold body 700 and the rear mold body 800, thereby preventing the melt from leaking.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.

Claims

1. a novel structure casting die is characterized in that: it comprises:

A die head seat, the top of the die head seat is provided with a feeding film port (100), the bottom of the die head seat is provided with a discharge die port (200), and the discharge mold port (200) extends left and right An elongated hole structure is provided, and a multi-stage flow channel connecting the feeding membrane port (100) and the discharge die port (200) is arranged inside the die base, and the multi-stage flow channel is from top to bottom. More than two-stage flow channel structure arranged in sequence, the multi-stage flow channel includes a first-stage flow channel (300) communicated with the feeding membrane port (100), and a last-stage flow channel communicated with the discharge die port (200) Road(400);

Among them, the first-stage flow channel is divided into two to become the second-stage flow channel in the opposite direction;

The last-stage flow channel (400) is communicated with the discharge die (200) through a gradient narrow advection channel (500) extending left and right, and the last-stage flow channel (400) is small in the upper part and large in the lower part. Cavity flow channel.

2. a kind of novel structure casting die head according to claim 1 is characterized in that:

The cross-sections of the flow channels on the upper side of the last-stage flow channel (400) are all circular structures.

3. a kind of novel structure casting die head according to claim 1 is characterized in that:

The last stage flow channel (400) has a horn structure with a small upper part and a large lower part on the main view projection plane, and the cross section of the last stage flow channel (400) has a large upper part and a small flat structure at the bottom.

4. a kind of novel structure casting die head according to claim 1 is characterized in that:

The die base includes a front die body (700) and a rear die body (800), the front die body (700) and the rear die body (800) are assembled and connected by bolts, and the feed film port (100), A discharge die (200), a multi-stage flow channel and a gradual narrow advection channel (500) are formed between the front mold body (700) and the rear mold body (800).

5. a kind of novel structure casting die head according to claim 4 is characterized in that:

Both the front mold body (700) and the rear mold body (800) are provided with connecting holes (600) penetrating through the front and rear, the number of the connecting holes (600) is multiple, and the two corresponding connection The holes (600) are connected by the bolts.