CN206201437U - A kind of two-layer compound PP R pipe molds - Google Patents

Abstract

The utility model relates to providing a double-layer composite PP-R pipe mould, comprising a mold connecting section, a mold base, an outer mold body and a forming part, one end of the mold base is provided with a mold connecting section, and the other end of the mold base is connected to the mold base. The outer mold body is connected, the end of the outer mold body is connected to the molding part, the outer mold body is connected to the molding part through the double-layer melt flow channel provided inside, and the raw material enters through the mold connecting section After melting in the mold, it enters the forming part along the double-layer melt channel and extrudes into a PP-R tube blank. The design of the utility model will adopt a double-layer melt flow channel structure, the inner melt flow channel mold controls the extrusion volume of the inner layer, the outer layer melt flow channel mold controls the extrusion volume of the outer layer, and then the inner layer melt flow The melt channel and the melt in the outer melt flow channel merge in the fluid channel formed by the outer mold body and the shrink sleeve, and the merged melt leads to the mold forming part through the flow channel, and is extruded It can meet the purpose of PP-R double-layer co-extrusion production.

Description

A double-layer composite PP-R pipe mold

technical field

The utility model relates to the technical field of molds, in particular to a double-layer composite PP-R pipe mold required for the production of plastic pipes.

Background technique

PP-R pipe is also called three-type polypropylene pipe, which is made of random copolymerized polypropylene, which is extruded into pipes and injection molded into pipe fittings. It is a new type of plastic pipe product developed and applied in Europe in the early 1990s. In the late 1980s, PP-R adopted the gas phase copolymerization process to randomly and uniformly polymerize about 5% of PE in the molecular chain of PP to become a new generation of pipeline materials. It has good impact resistance and long-term creep performance. At present, most PP-R pipes on the market have a single-layer structure, and the molds for producing the PP-R pipes are mainly single-layer extrusion, which cannot meet the production of double-layer co-extruded PP-R pipes.

Utility model content

In order to overcome at least one defect described in the above-mentioned prior art, the utility model provides a double-layer composite PP-R pipe mold, which includes a mold connecting section, a mold base, an outer mold body and a forming part, and one end of the mold base A mold connection section is provided, the other end of the mold base is connected to the outer mold body, the end of the outer mold body is connected to the molding part, and the outer mold body passes through the double-layer melt flow channel provided in it Connected with the forming part, the raw material enters the mold through the mold connection section to melt, and then enters the forming part along the double-layer melt channel to be extruded into a PP-R tube blank. The design of the utility model will adopt a double-layer melt flow channel structure, the inner layer melt flow channel mold controls the extrusion volume of the inner layer, the outer layer melt flow channel mold controls the extrusion volume of the outer layer, and then the inner layer melt flow The melt channel and the melt in the outer melt flow channel merge in the fluid channel formed by the outer mold body and the shrink sleeve, and the merged melt leads to the mold forming part through the flow channel, and is extruded Out of molding, reaching the mold can meet the purpose of PP-R double-layer co-extrusion production.

Preferably, the double-layer melt flow channel includes an outer layer melt flow channel, an inner layer melt flow channel, an outer mold body and a shrink sleeve, and the inner layer melt flow channel includes The feed port of the mold connection section, the branch flow channel at the bottom of the inner spiral body and the outer spiral body, the feed port of the mold connection section forms a channel through the mold base and the branch flow channel at the bottom of the inner spiral body, and the channel It is also connected with the spiral groove provided on the outer helix and the channel formed by the outer mold body; the outer melt flow channel includes an outer material inlet and an inner helix arranged on the upper end of the outer mold body , the outer layer feed port is connected with the inner layer spiral body; the inner layer melt channel and the outer layer melt channel merge in the fluid channel formed by the outer mold body and the shrink sleeve , the merged flow channel is connected with the forming part. The raw material enters the flow channel at the bottom of the inner spiral body from the feed port of the mold connection section and passes through the mold base, and the raw material melt is divided through the inner spiral body flow channel, and then flows along the spiral groove of the outer layer spiral body and the outer mold body. The channel carries out axial spiral movement to realize the initial fusion and plasticization of the raw material melt; at the same time, the raw material also enters the inner spiral body through the outer layer inlet, and the one-way thrust is gradually balanced through multiple annular grooves, so that the raw material melt goes out. The material reaches an equilibrium state, and the melt melted from the inner layer melt flow channel and the outer layer melt flow channel merges in the fluid channel formed by the outer mold body and the shrink sleeve, and the merged flow channel and the forming department connection.

Preferably, the forming part includes a die and a core, the core fixing device is inside the die, and the channel formed by the core and the die is connected to the inner layer melt channel and The merged flow channels of the outer melt flow channels are connected. The melt melted from the inner layer melt flow channel and the outer layer melt flow channel is fused and plasticized by the inner layer and the inner layer, and reaches the molding part of the mold. The channel of the forming part changes from large to small, and the channel is in a tapered structure. Such a structure can The mixed melt layer is further compressed and compacted, and passed through the die and the straight section of the core and extruded into a tube blank to form a PP-R pipe.

As a preference, the helix of the branch flow channel at the bottom of the inner helix is divided into six channels. This design is to divide the melt of the raw material into six strands by one flow spiral to reduce the thrust of the melt inflow at the connecting section of the mold, which is conducive to the smooth operation of the mold.

Preferably, the inner spiral adopts a ring design. Since the outer layer melt channel adopts unilateral feeding, that is, the material is fed from the outer layer inlet, and the inner layer helix mold is under uneven pressure, so the inner layer helix adopts a ring design, and the one-way thrust is gradually increased through multiple ring grooves. Balance, so that the melt discharge reaches a balanced state, to ensure the smooth operation of the mold.

Preferably, a die pressing plate is provided outside the die. In order to make the mold forming part work smoothly, there is also a die pressing plate around the die to ensure the normal work of the forming part under certain pressure.

Compared with the prior art, the beneficial effects of the utility model are:

The design of the utility model will adopt a double-layer melt flow channel structure, the inner melt flow channel mold controls the extrusion volume of the inner layer, the outer layer melt flow channel mold controls the extrusion volume of the outer layer, and then the inner layer melt flow The melt channel and the melt in the outer melt flow channel merge in the fluid channel formed by the outer mold body and the shrink sleeve, and the merged melt leads to the mold forming part through the flow channel, and is extruded Out of molding, reaching the mold can meet the purpose of PP-R double-layer co-extrusion production.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the schematic diagram of the structure of the shunt channel at the bottom of the inner layer helix of the present invention;

Figure 3 is a schematic cross-sectional view of a PP-R pipe.

detailed description

The utility model will be further described below in conjunction with specific embodiments. Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than actual drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present utility model, some parts of the accompanying drawings will be omitted , enlargement or reduction, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings may be omitted.

In the accompanying drawings of the utility model embodiment, the same or similar symbols correspond to the same or similar parts; The orientation or positional relationship indicated by "right", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, It is constructed and operated in a specific orientation, so the terms describing the positional relationship in the drawings are for illustrative purposes only, and should not be construed as limitations on this patent. Those of ordinary skill in the art can understand the meaning of the above terms according to specific situations. Concrete meaning.

Example

As shown in Figures 1 to 3, a double-layer composite PP-R pipe mold of the best embodiment of the present invention includes a mold connecting section 1, a mold base 2, an outer mold body 4 and a forming part, and the mold base One end of the mold base 2 is provided with a mold connection section 1, the other end of the mold base 2 is connected to the outer mold body 4, and the end of the outer mold body 4 is connected to the molding part, and the outer mold body 4 is arranged on the The double-layer melt channel inside is connected to the forming part, and the raw material enters the mold through the mold connection section 1 to be melted, and then enters the forming part along the double-layer melt channel to be extruded into a PP-R tube blank. The design of the utility model will adopt a double-layer melt flow channel structure, the inner layer melt flow channel mold controls the extrusion volume of the inner layer, the outer layer melt flow channel mold controls the extrusion volume of the outer layer, and then the inner layer melt flow The melt channel and the melt in the outer melt flow channel merge in the fluid channel formed by the outer mold body and the shrink sleeve, and the merged melt leads to the mold forming part through the flow channel, and is extruded Out of molding, reaching the mold can meet the purpose of PP-R double-layer co-extrusion production.

Preferably, the double-layer melt flow channel includes an outer layer melt flow channel, an inner layer melt flow channel, an outer mold body 4 and a shrink sleeve 6, and the inner layer melt flow channel includes The feed inlet of the mold connection section on the section 2, the shunt channel at the bottom of the inner spiral body 5 and the outer spiral body 3, the feed inlet of the mold connection section 1 passes through the mold base 2 and the shunt flow at the bottom of the inner spiral body 5 The passage constitutes a channel, and this channel is also connected with the channel formed by the spiral groove provided on the outer spiral body 3 and the outer mold body 4; The outer layer feed port 10 at the upper end is connected with the inner layer spiral body 5, and the outer layer feed port 10 is connected with the inner layer spiral body 5; the inner layer melt flow channel and the outer layer melt flow channel are connected The fluid channel formed by the outer mold body 4 and the shrink sleeve 6 merges, and the merged flow channel is connected with the molding part. The raw material enters the flow channel at the bottom of the inner spiral body from the feed port of the mold connection section and passes through the mold base, and the raw material melt is divided through the inner spiral body flow channel, and then flows along the spiral groove of the outer layer spiral body and the outer mold body. The channel carries out axial spiral movement to realize the initial fusion and plasticization of the raw material melt; at the same time, the raw material also enters the inner spiral body through the outer layer inlet, and gradually balances the one-way thrust through multiple annular grooves, so that the raw material melt goes out. The material reaches an equilibrium state, and the melt melted from the inner layer melt flow channel and the outer layer melt flow channel merges in the fluid channel formed by the outer mold body and the shrink sleeve, and the merged flow channel and the forming department connection.

As preferably, the molding part includes a die 9 and a core 8, the core 8 is fixed in the die 9, and the channel formed by the core 8 and the die 9 is connected to the inner core 8. The melt flow channel of the first layer is connected with the flow channel after the fusion of the melt flow channel of the outer layer. The melt melted from the inner layer melt flow channel and the outer layer melt flow channel is fused and plasticized by the inner layer and the inner layer, and reaches the molding part of the mold. The channel of the forming part changes from large to small, and the channel is in a tapered structure. Such a structure can The mixed melt layer is further compressed and compacted, and passed through the die and the straight section of the core and extruded into a tube blank to form a PP-R pipe.

As a preference, the branch flow channel at the bottom of the inner spiral body 5 is helically divided into six channels. This design is to divide the melt of the raw material into six strands by one flow spiral to reduce the thrust of the melt inflow at the connecting section of the mold, which is conducive to the smooth operation of the mold.

Preferably, the inner spiral body 5 adopts a ring design. Since the outer layer melt channel adopts unilateral feeding, that is, the material is fed from the outer layer inlet, and the inner layer helix mold is under uneven pressure, so the inner layer helix adopts a ring design, and the one-way thrust is gradually increased through multiple ring grooves. Balance, so that the melt discharge reaches a balanced state, to ensure the smooth operation of the mold.

Preferably, a die pressing plate 7 is provided outside the die 9 . In order to make the mold forming part work smoothly, there is also a die pressing plate around the die to ensure the normal work of the forming part under certain pressure.

Compared with the prior art, the beneficial effects of the utility model are:

The design of the utility model will adopt a double-layer melt flow channel structure, the inner layer melt flow channel mold controls the extrusion volume of the inner layer, the outer layer melt flow channel mold controls the extrusion volume of the outer layer, and then the inner layer melt flow The melt channel and the melt in the outer melt flow channel merge in the fluid channel formed by the outer mold body and the shrink sleeve, and the merged melt leads to the mold forming part through the flow channel, and is extruded Out of molding, reaching the mold can meet the purpose of PP-R double-layer co-extrusion production.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included in the protection scope of the claims of the utility model.

Claims (6)

1. A double-layer composite PP-R pipe mold, including a mold connecting section (1), a mold base (2), an outer mold body (4) and a forming part, and one end of the mold base (2) is provided with a mold connecting section (1), the other end of the mold base (2) is connected to the outer mold body (4), and the end of the outer mold body (4) is connected to the molding part, characterized in that the outer mold The body (4) is connected to the molding part through the double-layer melt flow channel inside it, and the raw material enters the mold through the mold connecting section (1) to melt and then enters the molding part along the double-layer melt flow channel Extruded into PP-R tube billet. 2. The double-layer composite PP-R pipe mold according to claim 1, wherein the double-layer melt flow channel comprises an outer layer melt flow channel, an inner layer melt flow channel, and an outer mold body (4 ) and the shrink sleeve (6), The inner layer melt flow channel includes the mold connection section feed port arranged on the mold connection section (1), the inner layer helix (5) bottom branch flow channel and the outer layer helix (3), the mold connection The feed inlet of the section forms a channel through the mold base (2) and the flow channel at the bottom of the inner spiral body (5), and the channel is also connected with the spiral groove on the outer spiral body (3) and the The channel formed by the outer mold body (4) is connected; The outer layer melt channel includes an outer layer feed port (10) and an inner layer spiral body (5) arranged on the upper end of the outer mold body, and the outer layer feed port (10) and the inner layer spiral body ( 5) connected; The inner layer melt flow channel and the outer layer melt flow channel merge in the fluid channel formed by the outer mold body (4) and the shrink sleeve (6), and the merged flow channel and the molding part connect. 3. The double-layer composite PP-R pipe mold according to claim 2, characterized in that, the forming part includes a die (9) and a core (8), and the fixing device of the core (8) is in the inside the mouth die (9), and the channel formed by the mold core (8) and the mouth die (9) merges with the inner layer melt flow channel and the outer layer melt flow channel to connect. 4. The double-layer composite PP-R pipe mold according to claim 2, characterized in that, the branch flow channel at the bottom of the inner layer helix (5) is helically divided into six channels. 5. The double-layer composite PP-R pipe mold according to claim 2, characterized in that, the inner spiral body (5) adopts a ring design. 6. The double-layer composite PP-R pipe mold according to claim 3, characterized in that, a die pressing plate (7) is provided outside the die (9).