CN102962973A - Method for forming wood plastic section bars with polyvinyl chloride (PVC) cladding layer and extrusion mould - Google Patents

Abstract

The invention relates to a method for forming wood plastic section bars with polyvinyl chloride (PVC) cladding layer and an extrusion mould. The method comprises the following steps of: adding a wood plastic base material into an extrusion mould from a mould head feeding port; extruding the wood plastic base material toward a mould outlet by a main flow channel after the wood plastic base material is added into the extrusion mould; adding PVC powder from a co-extrusion material flow channel charging port of the extrusion mould when the wood plastic base material is extruded to a section bar base material forming area; and extruding the mixed base material from a mould outlet after the added PVC powder and the wood plastic base material are mixed at an outer wall pre-forming flow channel so as to obtain the wood plastic section bars with the PVC cladding layer. By the method and the equipment, the wood plastic door/window main section bars with the PVC cladding layer can be manufactured, and the main section bars have the advantages of environment friendliness, resolvability and low cost; and the manufactured wood plastic door/window main section bars are environment-friendly and can preserve the advantages of attractiveness, anti-aging and the like of the conventional PVC section bars.

Description

Forming method of wood-plastic profile with PVC coating layer and extrusion die thereof

technical field

The invention relates to a molding method of a wood-plastic profile with a PVC coating layer and an extrusion die thereof, in particular to a molding method of a main profile of a wood-plastic door and window with a PVC coating layer and an extrusion die for realizing the method .

Background technique

The profiles of plastic doors and windows are mainly made of PVC, but PVC powder is derived from petroleum products and is a non-renewable resource. In order to better exert the energy-saving advantages of plastic doors and windows, people hope to replace PVC powder by recycling waste materials Material, and wood-plastic composite material is a good material, so using wood-plastic material instead of PVC powder to quote the main profile of doors and windows can reduce material costs. However, in practice, considering the beauty of the outer surface of the main profiles of doors and windows, a small amount of PVC powder is usually coated on the surface of wood-plastic materials, so that the main profiles of doors and windows can retain the beauty and anti-aging of traditional PVC profiles. Besides the advantages, it also has the advantages of low cost, good energy saving effect and more environmental protection.

In order to make WPC profiles with PVC cladding, two different materials need to be co-extruded using a mold. Existing extrusion dies such as CN201010570918.10 and CN201010572539.40, these two kinds of extrusion dies realize the co-extrusion of the same raw material, that is, the co-extrusion of PVC and PVC, but cannot realize the co-extrusion of different materials, so it is necessary to design A molding method of a wood-plastic profile with a PVC coating layer and an extrusion die thereof.

Contents of the invention

The object of the present invention is to provide a molding method of a wood-plastic profile with a PVC coating, and simultaneously design an extrusion die for realizing the method.

Method of the present invention comprises the steps:

Add the wood-plastic base material into the extrusion die from the feed port of the die head;

After the wood-plastic base material is added to the extrusion mold, the wood-plastic base material is extruded toward the exit of the mold through the main channel;

When the wood-plastic base material is extruded to the profile base material forming area, the PVC powder is added from the co-extrusion flow channel inlet of the extrusion die;

The PVC powder to be added and the wood-plastic base material are fused with the wood-plastic base material at the preformed flow channel on the outer wall, and then extruded from the outlet of the mold to obtain a wood-plastic profile with a PVC coating.

The present invention realizes the extrusion die of above-mentioned method, and this extrusion die comprises die feed port and sprue, and this extrusion die also comprises the compression plate that connects successively, preform plate, first forming plate, second forming board;

A core splitter cone is fixedly connected in the main channel, and an inner rib flow channel connected with the main channel is provided in the center of the core splitter cone, and an insert is fixedly connected to one end of the core splitter cone, and the center of the insert block A profile inner rib forming area connected with the inner rib flow channel is provided, and a profile base material forming area communicated with the main flow channel is provided in the center of the preformed plate;

The center of the first forming plate and the second forming plate is provided with an outer wall pre-forming flow channel connected to the forming area of the profile base material;

The compression plate and the preforming plate are provided with a co-extrusion material flow channel inlet, and one end of the co-extrusion material flow channel inlet is fixedly connected with a co-extrusion main channel, and a co-extrusion main channel is fixedly connected with a co-extrusion main channel. Extrusion runners and bayonet feed chambers, the co-extrusion runners are fixedly connected with a co-extrusion slit runner, and one end of the co-extrusion slit runner communicates with the outer wall preformed runner. the

Beneficial effects of the present invention: After adopting the method and equipment described in the present invention, the main profiles of wood-plastic doors and windows with PVC cladding layers can be produced, which has the advantages of environmental protection, decomposability, and low price; Fully covered co-extruded form, the outer layer of the main profile of wood-plastic doors and windows is PVC and the inner layer is still wood-plastic, so that the main profile of wood-plastic doors and windows can not only save energy and protect the environment, but also retain the beauty and resistance of traditional PVC profiles. advantages of aging.

Description of drawings

Fig. 1 is the schematic diagram of the profile produced by the present invention.

Fig. 2 is a structural schematic diagram of the extrusion die of the present invention.

Fig. 3 is a sectional view taken along line A-A of Fig. 2 .

Fig. 4 is a sectional view taken along line B-B of Fig. 2 .

Fig. 5 is a sectional view along line C-C of Fig. 2 .

As shown in the figure: 1 insert, 2 second forming plate, 3 first forming plate, 4 preformed plate, 5 compression plate, 6 core splitter cone, 7 die inlet, 11 profile inner rib forming area, 31 outer wall preformed flow channel, 32 bayonet feed chamber, 41 co-extrusion gap flow channel, 42 profile base material forming area, 43 co-extrusion sub-runner, 51 co-extrusion material runner inlet, 52 co-extrusion main channel, 61 internal rib runners, 71 main flow channels.

Detailed ways

The present invention relates to a kind of molding method of the wood-plastic profile with PVC cladding layer, and the steps of this method are as follows:

Add the wood-plastic base material into the extrusion die from the feed port of the die head;

After the wood-plastic base material is added to the extrusion mold, the wood-plastic base material is extruded toward the exit of the mold through the main channel;

When the wood-plastic base material is extruded to the profile base material forming area, the PVC powder is added from the co-extrusion flow channel inlet of the extrusion die;

The PVC powder to be added and the wood-plastic base material are fused with the wood-plastic base material at the preformed flow channel on the outer wall, and then extruded from the outlet of the mold to obtain a wood-plastic profile with a PVC coating.

As shown in Figures 2, 3, 4, and 5, the present invention realizes the extrusion die of the above method. This extrusion die includes a die feed port 7 and a main flow channel 71. This extrusion die also includes sequentially connected Compressed plate 5, preformed plate 4, first formed plate 3, second formed plate 2;

The core splitter cone 6 is fixedly connected in the main channel 71, and the center of the core splitter cone 6 is provided with an inner rib runner 61 communicating with the main channel 71, and one end of the core splitter cone 6 is fixedly connected There is an insert 1, and the center of the insert 1 is provided with a profile inner rib forming area 11 connected with the inner rib flow channel 61, and the center of the preformed plate 4 is provided with a profile base material forming area 42 communicated with the main flow channel 71;

The center of the first forming plate 3 and the second forming plate 2 is provided with an outer wall pre-forming flow channel 31 communicating with the profile base material forming area 42;

The compression plate 5 and the preformed plate 4 are provided with a co-extrusion material flow channel inlet 51, and one end of the co-extrusion material flow channel inlet 51 is fixedly connected with a co-extrusion main channel 52, and the co-extrusion main flow channel A co-extrusion runner 43 and a bayonet feed chamber 32 are fixedly connected to the channel 52, and a co-extrusion forming slot runner 41 is fixedly connected to the co-extrusion runner 43, and one end of the co-extrusion molding slot runner 41 is connected to The outer wall preformed runners 31 are in communication with each other.

The present invention adopts this structure and the rear outer wall preformed runner 31 is used to extrude the outer surface of the main profile of wood-plastic doors and windows, and the profile inner rib forming area 11 is used to extrude the inner ribs and bayonet feeding chamber of the main profile of wood-plastic doors and windows. 32 Functional bayonets for extruding the main profiles of wood-plastic doors and windows.

The difference between the forming method of the present invention and the fully-covered co-extrusion method of ordinary PVC profiles lies in that the co-extrusion material and the base material are different materials; the melt viscosity and melting temperature of the co-extrusion material and the base material differ greatly, if Using the existing extrusion die to extrude wood-plastic profiles with PVC coating, due to the poor compatibility between the co-extruded material and the base material, delamination and cracking of the inner layer of wood-plastic are prone to occur after co-extrusion. Therefore, the existing extrusion die cannot extrude the wood-plastic profile with the PVC coating.

When the present invention is in use, the wood-plastic base material is added to the extrusion die and extruded toward the outlet of the die, a part of the wood-plastic base material enters the inner rib runner 61, and the other part of the wood-plastic base material enters the co-extrusion runner 43 through the main channel 71 ;

The wood-plastic base material entering the inner rib runner 61 enters the profile inner rib forming area 11; the wood-plastic base material entering the co-extrusion shunt 43 flows to the profile base material forming area 42, and the wood-plastic base material enters the profile base material forming area 42 When adding PVC powder from the co-extrusion flow channel inlet 51 of the extrusion die, the PVC powder co-extrudes the main channel 52 through the co-extrusion material flow channel inlet 51;

The PVC powder entering the co-extrusion main channel 52 enters the co-extrusion sub-runner 43 and the bayonet feeding chamber 32 respectively, and the PVC powder that enters the co-extrusion sub-runner 43 enters the extrusion forming gap flow channel 41 and is combined with the profile base material forming area 42 The wood-plastic base material is fused, and after fusion, enters the outer wall preformed flow channel 31 and extrudes from the outlet of the mold and the wood-plastic base material in the profile inner rib forming area 11 simultaneously;

In this way, a wood-plastic profile with a PVC coating is obtained.

In order to avoid weld lines appearing at the connection between the functional bayonet and the wood-plastic base material of the extruded wood-plastic door and window main profile, the present invention arranges the co-extrusion main channel of the extrusion die on the compression plate 5, and the co-extrusion main channel 52 respectively The co-extrusion runner 43 and the bayonet feeding chamber supply the material 32 , and then the co-extrusion material is fed into the co-extrusion gap runner 41 through the co-extrusion runner on the preformed plate 4 . Since the co-extrusion main channel 52 has branches like branches, the co-extrusion runner 43 and the bayonet feeding chamber 32 are connected at the fork, so the PVC powder is divided, and a part of the PVC powder can be evenly spread on the wood-plastic base. The surface of the material is fused with the wood-plastic base material in the outer wall preformed runner 31, and another part of the PVC powder enters the bayonet feed chamber 32. The PVC powder is extruded to the mold outlet and fused with the base material at the outlet to form a wood The functional bayonet of the main profile of the plastic door and window, thus avoiding the welding marks at the joint between the functional bayonet and the wood-plastic base material of the main profile of the wood-plastic door and window.

In summary, after adopting the method and equipment described in the present invention, the main profiles of wood-plastic doors and windows with PVC cladding layers can be produced, which has the advantages of environmental protection, decomposability, and low price; In the form of cladding co-extrusion, the outer layer of the main profile of wood-plastic doors and windows is PVC and the inner layer is still wood-plastic, so that the main profile of wood-plastic doors and windows can not only save energy and protect the environment, but also retain the beauty and anti-aging of traditional PVC profiles. Etc.

Claims (2)

1. The forming method of the wood-plastic profile with PVC coating is characterized in that the method comprises the steps: Add the wood-plastic base material into the extrusion die from the feed port of the die head; After the wood-plastic base material is added to the extrusion mold, the wood-plastic base material is extruded toward the exit of the mold through the main channel; When the wood-plastic base material is extruded to the profile base material forming area, the PVC powder is added from the co-extrusion flow channel inlet of the extrusion die; The PVC powder to be added and the wood-plastic base material are fused with the wood-plastic base material at the preformed flow channel on the outer wall, and then extruded from the outlet of the mold to obtain a wood-plastic profile with a PVC coating. 2. An extrusion die used for the molding method of the wood-plastic profile with PVC coating as claimed in claim 1, it comprises a die feed port (7) and a main channel (71), characterized in that it also It includes compressed plates (5), preformed plates (4), first formed plates (3) and second formed plates (2) fixed in sequence; The core splitter cone (6) is fixedly connected to the main channel (71), and the center of the core splitter cone (6) is provided with an inner rib channel (61) connected with the main channel (71). One end of the core splitter cone (6) is fixedly connected with an insert (1), and the center of the insert (1) is provided with an inner rib forming area (11) of the profile that communicates with the inner rib flow channel (61). In the center of the forming plate (4) there is a profile base material forming area (42) connected to the main channel (71); The center of the first forming plate (3) and the second forming plate (2) is provided with an outer wall preformed flow channel (31) communicating with the profile base material forming area (42); The compression plate (5) and the preformed plate (4) are provided with a co-extrusion flow channel inlet (51), and one end of the co-extrusion material flow channel inlet (51) is fixedly connected with a co-extrusion main flow Road (52), the co-extrusion main channel (52) is fixedly connected with the co-extrusion runner (43), the bayonet feeding chamber (32), and the co-extrusion runner (43) is fixed with the co-extrusion molding A slit flow channel (41), one end of the co-extruded slit flow channel (41) communicates with the outer wall preformed flow channel (31).

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