A glass continuous co-extrusion process for a co-extrusion die

Abstract

The application discloses a glass fiber continuous co-extrusion process for a co-extrusion die, which comprises the following steps: S1, coating a molten material layer on the surface of a glass fiber tape; S2, adding granular plastic into an extruder to heat and form a base material in a molten state, and extruding into a die body of a co-extrusion die; S3, the base material entering into the die body successively passes through a transition plate, a first support plate, a second support plate, a confluence plate, a first die plate and is extruded into a second die plate; S4, a feeding end of a third die plate is provided with a co-extrusion layering assembly, the glass fiber tape enters into the third die plate through the co-extrusion layering assembly and is located in the middle part of a preformed base material, and the co-extrusion of the glass fiber is completed; and S5, extrusion molding is carried out to form a glass fiber co-extruded plastic product; and the application realizes the continuous co-extrusion of the glass fiber, thereby improving the strength, rigidity, heat resistance, weather resistance, wear resistance and impact resistance of the product.

Description

Technical Field

[0001] This invention relates to the technical field of plastic molds, and more particularly to a continuous co-extrusion process for glass fiber for co-extrusion molds. Background Technology

[0002] Glass fiber is a fibrous material made of glass, possessing advantages such as lightweight, high strength, corrosion resistance, and insulation, and is widely used in aerospace, automotive, and construction industries. In plastic molded products, the application of glass fiber effectively enhances the strength, rigidity, heat resistance, weather resistance, wear resistance, and impact resistance of the plastic products. Furthermore, due to its relatively low price compared to other reinforcing materials, glass fiber can reduce the cost of plastic products and improve their cost-effectiveness.

[0003] However, during the manufacturing process of plastic products, the weak bonding between glass fiber and the substrate (such as PP or PE) leads to easy separation between the glass fiber and the substrate, which seriously affects the strength, rigidity and other properties of the plastic products. Furthermore, due to the relatively soft material of glass fiber tape, how to achieve co-extrusion between glass fiber tape and substrate has always been a difficult technical problem to solve, which has brought significant obstacles to the high-quality production of molded products and is not conducive to the development of the industry. Summary of the Invention

[0004] In view of this, in order to overcome the shortcomings of the prior art, the present invention provides a continuous co-extrusion process for glass fiber using a co-extrusion die. By setting a co-extrusion layering component, the base material extruded from the second die is divided into upper and lower layers, so that the glass fiber tape is located in the middle of the upper and lower layers of the base material, which facilitates the co-extrusion of the glass fiber tape, that is, the continuous co-extrusion of glass fiber is realized, thereby improving the strength, rigidity, heat resistance, weather resistance, wear resistance and impact resistance of the product.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A continuous co-extrusion process for glass fiber using a co-extrusion die includes the following process steps: S1. Fiberglass tape impregnation: The fiberglass tape is immersed in the molten material of the same material as the co-extruded substrate, so that the surface of the fiberglass tape is covered with a layer of molten material of the same material as the co-extruded substrate. That is, if the co-extruded substrate is PP material, the fiberglass tape is immersed in the molten material of PP material; if the co-extruded substrate is PE material, the fiberglass tape is immersed in the molten material of PE material. Then, the fiberglass tape that has been immersed and dried is inserted into the third template 100 through the fiberglass tape guide component 130. S2. Extrusion: The granular plastic is added to a twin-screw extruder and heated to form a molten base material, which is then extruded into the die of a co-extrusion mold. S3, Extrusion Pre-forming: The base material entering the mold body is extruded sequentially through the transition plate, the first support plate, the second support plate, the confluence plate, and the first die into the second die, and is pre-formed under the action of the first die, the second die, and the flow divider cone; S4. Co-extrusion of glass fiber: The glass fiber tape coated with the molten material layer in S1 enters the third mold through the side of the second mold. The feed end of the third mold is provided with a co-extrusion layering component. The glass fiber tape enters the third mold through the co-extrusion layering component. The co-extrusion layering component divides the pre-formed base material extruded from the second mold into upper and lower layers. The glass fiber tape is located in the middle of the upper and lower base materials, thus completing the co-extrusion of glass fiber. S5. Extrusion molding: The co-extruded fiberglass tape and base material pass through the third and fourth molds in sequence and are cooled and molded to form a co-extruded fiberglass plastic product.

[0006] Preferably, in step S3, depending on the location of the fiberglass strip, the fiberglass strip covered with the molten material layer can enter the third mold from the upper side, lower side, left side, right side, or any combination thereof of the second mold.

[0007] Furthermore, the co-extrusion layering assembly is disposed at the feed end of the third die. The co-extrusion layering assembly includes several layering protrusions and a cylindrical layering guide shaft. The layering guide shaft is horizontally welded to the layering protrusions. The layering protrusions and the layering guide shaft form a hollow structure at the lower end. Molten material enters the third die from the upper and lower ends of the layering guide shaft, respectively, which facilitates the co-extrusion fusion of the fiberglass tape.

[0008] Furthermore, the second die is equipped with a fiberglass tape inlet assembly, which includes an inlet support and a guide plate. A through guide groove is provided inside both the guide plate and the inlet support. A layer of heat-insulating cotton can also be placed between the inlet support and the second die to block heat conduction. An oblique fiberglass channel is provided on the side of the second die, and the guide groove connects to the fiberglass channel. The fiberglass tape enters the third die from the guide plate, the inlet support, and the fiberglass channel. The fiberglass tape does not participate in the entire co-extrusion process; it enters at the relatively cooler second die, effectively preventing the molten material layer covering the fiberglass tape from detaching due to high temperatures, thus affecting the bonding ability between the fiberglass tape and the plastic product substrate.

[0009] Furthermore, the mold body, transition plate, first support plate, second support plate, manifold, first die plate, second die plate, third die plate, and fourth die plate form a co-extrusion mold, and a flow divider cone is provided inside the co-extrusion mold. The co-extrusion mold can be a marine pedal fiberglass co-extrusion mold, a fiberglass co-extrusion mold for wound pipes, sheets, or other types of fiberglass co-extrusion molds.

[0010] Furthermore, the mold body is provided with a dual-stage flow channel, which is divided into a first compaction flow channel and a second compaction flow channel. The inlet end of the first compaction flow channel is cylindrical, and the outlet end is conical, with the cross-sectional area of ​​the inlet end being larger than that of the outlet end. The second compaction flow channel is hexagonal, and the outlet end of the first compaction flow channel is connected to any vertex of the second compaction flow channel. This dual-stage flow channel design helps to improve the compactness of the base material, thereby improving product quality.

[0011] Furthermore, the interior of the third mold plate is equipped with a water-cooling tank, which is beneficial for cooling and shaping the plastic products in the mold, thereby improving product quality.

[0012] Furthermore, each fiberglass tape has a three-layer structure, with the third layer sandwiched between any two layers, which facilitates the subsequent replenishment and replacement of the fiberglass tape. Sufficient distance is reserved between any two adjacent fiberglass tapes to allow the molten base material to flow from the reserved gap to the upper and lower sides of the fiberglass tape, thus facilitating the co-extrusion and fusion of the fiberglass tape and the base material.

[0013] The beneficial effects of the present invention are: (1) The fiberglass tape inlet is set on the second die at a relatively low temperature, so that the fiberglass tape does not participate in the whole co-extrusion process, which can effectively prevent the molten material layer covering the fiberglass tape from falling off due to high temperature and causing flow obstruction, thereby ensuring the smoothness of extrusion and improving the bonding ability between the fiberglass tape and the plastic product substrate; (2) Through the setting of the co-extrusion layered component, the base material extruded in the second die is divided into upper and lower layers, and the fiberglass tape is located in the middle of the upper and lower base materials, which facilitates the co-extrusion of the fiberglass tape, that is, the continuous co-extrusion of fiberglass is realized, thereby improving the strength, rigidity, heat resistance, weather resistance, wear resistance and impact resistance of the product; (3) Through the three-layer structure of the fiberglass tape, the third layer can be sandwiched between any two layers, which facilitates the subsequent replenishment and replacement of the fiberglass tape. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partially enlarged structural diagram of point A in this invention; Figure 3 This is a partially enlarged structural diagram of point B in this invention; Figure 4 This is a schematic diagram of the structure of the third template in this invention; Figure 5 This is a schematic diagram of the structure of a glass fiber co-extruded plastic product.

[0016] In the diagram, 010 is fiberglass tape, 020 is the mold body, 030 is the transition plate, 040 is the first support plate, 050 is the second support plate, 060 is the manifold plate, 070 is the first template, 080 is the second template, 090 is the flow divider cone, 100 is the third template, 110 is the co-extrusion layering assembly, 111 is the layering protrusion, 112 is the layering guide shaft, 120 is the fourth template, 130 is the fiberglass tape inlet assembly, 131 is the inlet support, 132 is the guide plate, 133 is the guide groove, 140 is the fiberglass channel, 150 is the dual-stage flow channel, 151 is the first dense flow channel, 152 is the second dense flow channel, and 160 is the water cooling tank. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Reference Figures 1 to 4 As shown, taking the production of fiberglass marine treadmills as an example, the base material is PE, and the continuous co-extrusion process of fiberglass includes the following steps: S1. Fiberglass tape impregnation: The fiberglass tape 010 is immersed (wetted) in molten PE so that the surface of the fiberglass tape 010 is covered with a layer of molten PE material, and then inserted into the third template 100 through the fiberglass tape guide component 130. S2, Extrusion: The granular plastic is added to a twin-screw extruder and heated to form a molten base material, which is then extruded into the die body 020 of the co-extrusion die; S3, Extrusion Preforming: The base material entering the mold body 020 is extruded sequentially through the transition plate 030, the first support plate 040, the second support plate 050, the confluence plate 060, and the first die 070 into the second die 080. The molten base material is preformed under the action of the first die 070, the second die 080, and the flow divider cone 090. S4. Co-extrusion of glass fiber: The glass fiber tape 010 coated with the molten material layer in S1 enters the third mold 100 through the side of the second mold 080. The feed end of the third mold 100 is provided with a co-extrusion layering component 110. The glass fiber tape 010 enters the third mold 100 through the co-extrusion layering component 110. The co-extrusion layering component 110 divides the pre-formed base material extruded from the second mold 080 into upper and lower layers. The glass fiber tape 010 is located in the middle of the upper and lower layers of the base material, thus completing the co-extrusion of glass fiber. S5. Extrusion molding: The co-extruded fiberglass tape 010 and the base material pass through the third mold 100 and the fourth mold 120 in sequence and are cooled and molded to form a co-extruded fiberglass marine treadmill.

[0019] The co-extrusion layering assembly 110 is disposed at the feed end of the third die 100. The co-extrusion layering assembly 110 includes a plurality of layering protrusions 111 and a cylindrical layering guide shaft 112. The layering guide shaft 112 is horizontally welded to the layering protrusions 111. The layering protrusions 111 and the layering guide shaft 112 form a hollow structure at the lower end. The molten base material enters the third die 100 from the upper and lower ends of the layering guide shaft 112, respectively, which facilitates the co-extrusion fusion of the fiberglass tape 010.

[0020] A fiberglass tape inlet assembly 130 is provided on the second template 080. The fiberglass tape inlet assembly 130 includes an inlet support 131, on which a guide plate 132 is provided. A through guide groove 133 is provided inside the guide plate 132 and the inlet support 131. An oblique fiberglass channel 140 is provided on the side of the second template 080. The guide groove 133 is connected to the fiberglass channel 140. The fiberglass tape 010 enters the third template 100 from the guide plate 132, the inlet support 131, and the fiberglass channel 140. The fiberglass tape 010 does not participate in the entire co-extrusion process. It enters at the relatively low temperature of the second template 080, which can effectively prevent the molten material layer covering the fiberglass tape 010 from falling off due to high temperature, thus affecting the bonding ability between the fiberglass tape 010 and the plastic product substrate.

[0021] The mold body 020, transition plate 030, first support plate 040, second support plate 050, confluence plate 060, first template 070, second template 080, third template 100 and fourth template 120 form a marine pedal fiberglass co-extrusion mold.

[0022] The mold body 020 is provided with a dual-stage flow channel 150, which is divided into a first compaction flow channel 151 and a second compaction flow channel 152. The inlet end of the first compaction flow channel 151 is cylindrical, and the outlet end of the first compaction flow channel 151 is conical, with the cross-sectional area of ​​the inlet end of the first compaction flow channel 151 being larger than the cross-sectional area of ​​the outlet end of the first compaction flow channel 151. The second compaction flow channel 152 is hexagonal, and the outlet end of the first compaction flow channel 151 is connected to any vertex of the second compaction flow channel 152. The dual-stage flow channel 150 forms a dual-stage extrusion structure, which is beneficial to improving the compactness of the base material, thereby improving the quality of the product.

[0023] The third mold plate 100 is equipped with a water cooling tank 160, which is beneficial for cooling and shaping the plastic products in the mold and improving the quality of the products.

[0024] The fiberglass tape 010 in this technical solution has a three-layer structure. The significance of setting the three-layer structure is that the fiberglass tape 010 can be replenished and replaced by sandwiching the third layer between any two layers.

[0025] like Figure 5 As shown, in practical applications, a sufficient distance is reserved between any two adjacent fiberglass tapes 010 to facilitate the flow of the molten base material from the reserved gap to the upper and lower sides of the fiberglass tape 010, thus achieving co-extrusion and fusion of the fiberglass tape 010 and the base material.

[0026] It should be noted that this continuous co-extrusion process for glass fiber is not only suitable for co-extrusion of glass fiber, but also for co-extrusion of other fibers such as carbon braided fiber and basalt fiber.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous co-extrusion process for glass fiber using a co-extrusion die, characterized in that, The steps include the following: S1. Fiberglass tape impregnation: The fiberglass tape is immersed in a molten liquid of the same material as the co-extruded substrate, so that the surface of the fiberglass tape is covered with a layer of molten material of the same material as the co-extruded substrate. S2. Extrusion: The granular plastic is added to a twin-screw extruder and heated to form a molten base material, which is then extruded into the die of a co-extrusion mold. S3, Extrusion Pre-forming: The base material entering the mold body is extruded sequentially through the transition plate, the first support plate, the second support plate, the confluence plate, and the first die into the second die; S4. Co-extrusion of glass fiber: The glass fiber tape coated with the molten material layer in S1 enters the third mold through the side of the second mold. The feed end of the third mold is provided with a co-extrusion layering component. The glass fiber tape enters the third mold through the co-extrusion layering component. The co-extrusion layering component divides the pre-formed base material extruded from the second mold into upper and lower layers. The glass fiber tape is located in the middle of the upper and lower base materials, thus completing the co-extrusion of glass fiber. S5. Extrusion molding: The co-extruded fiberglass tape and base material pass through the third and fourth molds in sequence and are cooled and molded to form a co-extruded fiberglass plastic product. The co-extrusion layering component is disposed at the feed end of the third die plate. The co-extrusion layering component includes a layering protrusion and a cylindrical layering guide shaft. The layering guide shaft is welded to the layering protrusion, and the layering protrusion and the layering guide shaft form a structure with a hollow lower end. The second template is provided with a fiberglass tape inlet assembly, which includes an inlet support, a guide plate on the inlet support, and a through guide groove inside the guide plate and the inlet support.

2. The continuous co-extrusion process for glass fiber using a co-extrusion die according to claim 1, characterized in that, The second template has an oblique fiberglass channel on its side, and the guide groove is connected to the fiberglass channel.

3. The continuous co-extrusion process for glass fiber using a co-extrusion die according to claim 1, characterized in that, The mold body, transition plate, first support plate, second support plate, confluence plate, first template, second template, third template and fourth template form a co-extrusion mold, and the co-extrusion mold is provided with a flow divider cone inside.

4. The continuous co-extrusion process for glass fiber using a co-extrusion die according to claim 3, characterized in that, The mold body is provided with a two-stage flow channel, which is divided into a first dense flow channel and a second dense flow channel. The inlet end of the first dense flow channel is cylindrical, and the outlet end of the first dense flow channel is conical. The cross-sectional area of ​​the inlet end of the first dense flow channel is larger than the cross-sectional area of ​​the outlet end of the first dense flow channel. The second dense flow channel is hexagonal, and the outlet end of the first dense flow channel is connected to any vertex of the second dense flow channel.

5. The continuous co-extrusion process for glass fiber using a co-extrusion die according to claim 3, characterized in that, The third template is equipped with a water-cooling tank inside.

6. The continuous co-extrusion process for glass fiber using a co-extrusion die according to claim 1, characterized in that, Each fiberglass tape has a three-layer structure, and there is a space reserved between any two adjacent fiberglass tapes.

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