CN101947844A - Internal co-extrusion die for plastic section - Google Patents

Abstract

The invention relates to an internal co-extrusion die for a plastic section, which comprises a die head. A co-extrusion plate is arranged at the neck runner inlet end of the die head; the middle of the co-extrusion plate is provided with a main runner for a main material to pass; the middle of the main runner is provided with a core; the core is connected with the co-extrusion plate through a bracket; the middle of the core is provided with a horizontal co-extrusion runner which is provided with an opening on one side of the neck and is parallel to the main runner; the co-extrusion plate is provided with a co-extrusion runner communicated with the horizontal co-extrusion runner in the core through the bracket; and the side wall of the co-extrusion runner is provided with a co-extrusion material inlet communicated with the co-extrusion runner. Before the main material enters the neck, a co-extrusion material is fed in the middle of the main material to form internal co-extrusion, is wrapped by the main material and flows to a forming area to be formed; and the co-extrusion plate has high generality, can be applied to the internal co-extrusion of sections with any structure and reduces the manufacturing cost of the die.

Description

A plastic profile inner co-extrusion mold

technical field

The invention relates to an extruding die for plastic profiles, in particular to an internal co-extrusion die for plastic profiles.

Background technique

At present, the co-extrusion of extruded profiles is generally limited to the outer surface of the profile, and the national standard has very strict requirements on the outer surface of the profile. It is not possible to extrude low-cost co-extrusion materials, but to extrude better quality and lower prices. High co-extrusion material.

There is also a form of co-extrusion, which can realize the composite co-extrusion of the inner cavity of the extruded profile. It opens a flow channel from the mold plate at the rear of the extrusion die, and enters the cavity through the support ribs on the die bracket. Composite co-extrusion can be carried out on specific parts of the profile cavity, and it is unique. It cannot be interchanged with other molds, let alone control the proportion of co-extruded materials. The mold structure is complex and the processability is not good.

Contents of the invention

The object of the present invention is to provide an internal co-extrusion die for plastic profiles, which has good versatility and is applicable to the production of different profiles.

In order to achieve the above object, the present invention adopts the following technical solutions: including a die head, a co-extrusion plate is provided at the inlet end of the neck flow channel of the die head, a main flow channel for the main material to pass is provided in the middle of the co-extrusion plate, and a main flow channel is arranged in the middle of the main flow channel. There is a core, and the core is connected with the co-extrusion plate through the bracket. In the middle of the core, there is a horizontal co-extrusion flow channel opening on the side of the machine neck and parallel to the main channel. A co-extrusion flow channel communicated with the horizontal co-extrusion flow channel, and a co-extrusion feed inlet connected with the co-extrusion flow channel is arranged on the side wall of the co-extrusion plate. The co-extrusion material is conveyed from the co-extrusion material inlet of the co-extrusion plate to the middle of the flow channel of the machine neck through the co-extrusion flow channel and the horizontal co-extrusion flow channel. The material flows forward along the surface of the diverter cone in the machine neck to form the inner wall and inner rib of the profile, and the main material is smoothly squeezed to the outer ring to form the outer wall of the profile.

In order to make the co-extruded material cover the appropriate range of the inner wall of the profile and the inner rib, the aperture of the outlet end of the horizontal co-extruded flow channel is enlarged in a trumpet shape, so that the co-extruded material meets the main material at the outlet end.

In order to make the distribution more uniform, the core in the co-extrusion module is tapered at the inlet end of the main channel.

It can be seen from the above technical scheme that the present invention introduces the co-extrusion material into the middle of the main material before the main material enters the machine neck to form an internal co-extrusion, and flows to the forming area through the wrapping of the main material to form. The co-extrusion plate has good versatility and can be applied to Internal co-extrusion of profiles with any structure reduces the cost of mold manufacturing.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a left side view of the co-extruded plate assembly shown in Fig. 1;

Fig. 3 is a right side view of the second co-extrusion plate assembly shown in Fig. 1 .

Detailed ways

As shown in Figure 1, Figure 2 and Figure 3, the die head is composed of a machine neck 4, a core support plate 11, a compression plate 3, a preformed plate 2 and a forming plate 1, and the co-extruded plate is set on the flow channel of the machine neck 4 44 at the feed port, the co-extrusion plate is composed of a co-extrusion plate assembly 1 5 and a co-extrusion plate assembly 2 7, as shown in Figure 2 and Figure 3, the co-extrusion plate assembly 1 5 and the co-extrusion plate assembly 2 7 are installed The holes 54, 74 are fixed together by bolts, the co-extrusion plate assembly 1 5 and the co-extrusion plate assembly 2 7 are provided with main flow channels 53, 73 for the main material 9 to pass through, and the cores are arranged in the middle of the main flow channels 53, 73 52, 72, the cores 52, 72 are respectively connected to the co-extruded plate assembly 1 5 and the co-extruded plate assembly 2 7 through the brackets 51, 71, and the core 52 is provided with an opening on the side of the machine neck 4 and connected to the main channel 53, 73 Parallel horizontal co-extrusion runners 62, the aperture of the outlet end of the horizontal co-extrusion runners 62 expands in the shape of a trumpet, and there are co-extrusion feed inlets on the adjacent end faces of the co-extrusion plate assembly 1 5 and the co-extrusion plate assembly 2 7 6 and the co-extrusion runner 61, the co-extrusion runner 61 communicates with the horizontal co-extrusion runner 62 in the middle of the core 52 through the brackets 51, 71. The core 72 in the co-extrusion plate assembly 2 7 forms a conical splitter surface 74 at one end of the feed port of the main flow channel 73 to reduce the resistance when the main material 9 passes through.

When working, the main material 9 is conveyed by the screw 81 in the extruder 8 through the main channels 73 and 53 of the co-extrusion plate assembly 2 7 and the co-extrusion plate assembly 1 5 and enters the flow channel 44 of the machine neck 4; the co-extrusion material 10 The feed port 6, the co-extrusion flow channel 61 and the horizontal co-extrusion flow channel 62 on the side walls of the co-extrusion plate assembly 1 and the co-extrusion plate assembly 2 7 enter the middle of the flow channel 44 of the machine neck 4, and are conveyed by the main channel 53 The main material 9 is packaged and run under pressure together, the co-extrusion material 10 flows forward along the surface of the splitter cone 43 in the machine neck 4 and enters the cavity 41 forming the inner wall and inner rib of the profile, while the main material 9 is smoothly squeezed into The outer ring enters the outer wall cavity 42 forming the profile, and then is extruded through the core support plate 11 , the compression plate 3 , the preformed plate 2 and the formed plate 1 .

Claims (3)

1. co-extruding mould in the plastic material, comprise die head, it is characterized in that: machine neck (4) runner (44) entrance point at die head is provided with co-extrusion plate (5,7), co-extrusion plate (5,7) be provided with the sprue (53 that passes through for major ingredient (9) in the middle of, 73), sprue (53,73) be provided with core (52 in the middle of, 72), core (52,72) by support (51,71) plate squeezing (5 together, 7) link to each other, be provided with in the middle of the core (52) and be opened on machine neck (4) one sides and the horizontal co-extruding flow channel (62) parallel with sprue (53), co-extrusion plate (5,7) be provided with through support (51,71) with core (52) in the co-extruding flow channel (61) that communicates of horizontal co-extruding flow channel (62), co-extrusion plate (5,7) sidewall is provided with the co-extrusion material charging aperture (6) that communicates with co-extruding flow channel (61).

2. co-extruding mould in the plastic material according to claim 1, it is characterized in that: the port of export aperture of horizontal co-extruding flow channel (62) is horn-like expansion.

3. co-extruding mould in the plastic material according to claim 1 and 2 is characterized in that: the core (72) in the co-extrusion plate (7) is taper at sprue (73) charging aperture one end and divides stream interface (74).

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