WO2021017511A1 - Extruder die and wood plastic extruder having same - Google Patents

Abstract

An extruder die and a wood plastic extruder having same. The extruder die comprises a flow dividing die (10) formed by combining an upper die body (11) and a lower die body (12). The flow dividing die (10) is connected to a cylinder (1) of an extruder by means of a transition sleeve (20), and a flow channel (30) is provided in the flow dividing die (10). The flow channel (30) extends from the rear end of the dividing die (10) to the front end thereof and forms two independent branch flow channels (31). Molding dies (40) are connected to discharge ports of the two branch flow channels (31). By connecting the flow dividing die (10) to the cylinder (1) of the extruder, the extruder die simultaneously supply a material to two dies to make the two dies simultaneously perform extrusion, thereby improving the yield of the extruder and ensuring that the quality of produced wood plastic products satisfying use requirements. The design can improve production efficiency and reduce production costs.

Description

Die head for extruder and wood plastic extruder with same Technical field

The invention belongs to the technical field of extrusion molding equipment, in particular to a die for an extruder and a wood-plastic extruder with the die.

Background technique

Wood-plastic composite materials have been widely used in recent years due to their excellent performance and characteristics of energy saving and environmental protection. The co-extrusion technology for the wood-plastic composite materials is also under continuous development. The extruder die head is used to form the medium to be extruded into a fixed-shaped product. The design of the extruder die head is directly related to the production capacity and the quality of the final product. Therefore, the extruder die head is in the whole It occupies a pivotal position in the extruder.

Summary of the invention

technical problem

The solution to the problem

Technical solutions

The purpose of the present invention is to provide a die for an extruder, which can significantly increase the output and ensure that the quality of the processed wood-plastic composite material meets the requirements of use.

In order to achieve the above objectives, the present invention adopts the following technical solutions to achieve:

A die for an extruder, including:

The splitter die head is composed of an upper die body and a lower die body;

The splitting die is connected to the barrel of the extruder via a transition sleeve, and a runner is provided in the splitting die. The runners extend from the rear end to the front end of the splitting die and form two independent The outlets of the two branch channels are connected with forming molds.

Preferably, the two branch runners have the same size and are symmetrically arranged in the splitter die.

Preferably, a threaded disk is provided at the discharge port of the branch channel, and threaded holes are arranged at intervals along the circumference of the threaded disk for bolts to penetrate and fix the upper mold body and the lower mold body;

A first connecting plate arranged concentrically is fixed on the screw thread plate, and the first connecting plate is connected and fixed with a second connecting plate arranged at the end of the forming mold.

The present invention also provides a wood-plastic extruder, the wood-plastic extruder has the above-mentioned die for the extruder.

Preferably, the main engine speed of the wood-plastic extruder is 650-730 rpm; the feeding speed is 1200-1400 rpm.

The beneficial effects of the invention

Beneficial effect

Compared with the prior art, the present invention has the following technical effects:

The die head for the extruder provided by the present invention connects the splitter die head to the barrel of the extruder and feeds two pairs of dies at the same time, so that the two pairs of dies can be extruded at the same time, which effectively increases the output of the extruder At the same time, it ensures that the quality of the wood-plastic products produced meets the requirements of use; this design is of great significance for improving production efficiency and reducing production costs.

Other features and advantages of the present invention will be described in detail in the following specific embodiments.

Brief description of the drawings

Description of the drawings

Figure 1 is a schematic diagram of the assembly of a die for an extruder provided by the present invention;

Figure 2 is a schematic diagram of the extruder die provided by the present invention near one end of the molding die;

Figure 3 is a schematic diagram of the first and second connecting plates described in the present invention;

Explanation of reference numerals in the figure: 1- barrel, 10- split die head, 11- upper mold body, 12- lower mold body, 20- transition sleeve, 30- runner, 31- branch runner, 32- spiral tooth plate, 33 -The first connecting plate, 34- The second connecting plate, 40- forming mold.

Invention embodiment

Embodiments of the invention

In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention will be further clarified below in conjunction with specific drawings and embodiments.

As shown in FIG. 1, the present invention provides a die for an extruder. The die for an extruder includes a split die 10, and the split die 10 uses a combination of an upper die body 11 and a lower die body 12 It is connected to the barrel 1 of the extruder via a transition sleeve 20, and a runner 30 is provided in the split die 10, and the runner 30 extends from the rear end to the front end of the split die 10 Two independent branch runners 31 are formed, and a molding die 40 is connected to the discharge ports of the two branch runners 31.

In the present invention, the wood-plastic melted mixture uniformly melted and mixed by the extruder flows into the splitter die 10 through the transition sleeve 20, is diverted to the branch runner 31 through the runner 30, and then enters the molding die 40 to form the wood Plastic products. The extruder to its barrel 1 and the forming die 40 are all equipment in the prior art, but only the split die head 10 and the corresponding configuration are added to realize the connection and fixation of the front and rear ends, and the equipment is simple to modify. In addition, through the design of one machine and two modes, the output of the machine is significantly increased in a certain machine space.

In the present invention, the part of the runner 30 extending to the branch runner 31 is in an arc shape as a whole, and the arc of the arc part is 200°-240°; and, in order to improve the easier passage of the wood-plastic molten mixture, reduce The fluid resistance in the branch channel 31 reduces the wear of the molten wood-plastic mixture on the inner wall of the branch channel 31, and the inner wall of the branch channel 31 is chrome-plated.

According to the present invention, the wood-plastic products are extruded by means of one machine and two molds. In order to ensure that the speeds of the two molding dies 40 are equivalent, the two branch runners 31 have the same size and are arranged symmetrically in the branch. Inside the die 10.

In the present invention, as a specific connection method of the split die head 10 and the forming mold 40, as shown in FIGS. 2 and 3, a threaded disk 32 is provided at the outlet of the branch runner 31. 32 is provided with threaded holes arranged at intervals along the circumferential direction for bolts to be connected and fixed to the upper mold body 11 and the lower mold body 12; the threaded disk 32 is fixed with a first connecting large disk 33 arranged concentrically The first connecting plate 33 is connected and fixed to the second connecting plate 34 arranged at the end of the forming mold 40.

The invention also provides a wood-plastic extruder, which has the die head for the extruder. In order to adapt to the normal operation of the die for the extruder, ensure that the quality of the wood-plastic product produced meets the use requirements, and avoid product quality defects, the operating parameters of the extruder are compared with those in the prior art Make adjustments. Specifically, the main engine speed of the wood-plastic extruder is 650-730 rpm; the feeding speed is 1200-1400 rpm.

The following further illustrates the advantages of the extruder die provided by the present invention by comparing the production process parameters and product performance of a wood-plastic product before and after the die head is replaced.

Example 1 (one machine, one mold)

The specification for wood-plastic products is 1400mm*150mm*25mm;

The formula of wood-plastic products is: bamboo powder (purchased from Zhejiang Lin'an Mingzhu Bamboo and Wood Powder Co., Ltd., density 1.36g/cm3, particle size 90-450μm) 57kg; PE powder (purchased from Maoming Deen Trading Co., Ltd. Company) 22kg; Talc powder (purchased from Qingdao Jinying Talc Co., Ltd.) 8kg; Maleic anhydride grafted high-density polyethylene (purchased from Hangzhou Haiyi Polymer Material Co., Ltd., brand name EPA830H, melt flow rate 1.0～ 2.0g/10min (190°C/2.16kg)) 0.5kg; antioxidant (commercially available) 10760.5kg; coupling agent (purchased from Jiangsu Chenguang Coupling Agent Co., Ltd., trade name KH-550) 3kg.

The above-mentioned wood-plastic products are processed according to the conventional method, and fed into the wood-plastic extruder (SLZ65 conical twin-screw plastic extruder), the feeding speed is 800rpm, the extruder speed is 450rpm, and the extruder temperature parameters as follows:

The output of the product is 0.65 m/min.

Perform performance tests on the products produced above (refer to the "GB/T 24137-2009 Wood Plastic Decorative Board" test method for testing), take 10 products to measure and take the average value, the test data is as follows:

Test items	product requirement	Test data (mean)
Bending failure load	≥2500N	3,385.6
Bending strength	≥22.5MPa	27.5
Flexural modulus of elasticity	≥1800MPa	3,468.4

Example 2 (one machine and dual mode)

According to the wood-plastic product formula provided in Example 1, the molding die used in Example 1 is used;

The difference is that the feeding speed is adjusted to 1300rpm, and the speed of the extruder is 700rpm;

The temperature parameters of the extruder (SLZ65 conical twin-screw plastic extruder) are adjusted as follows:

The output of the product is 1.4 m/min.

Perform performance tests on the products produced above (refer to the "GB/T 24137-2009 Wood Plastic Decorative Board" test method for testing), take 10 products to measure and take the average value, the test data is as follows:

Test items	product requirement	Test data (mean)
Bending failure load	≥2500N	3,393.4
Bending strength	≥22.5MPa	26.7
Flexural modulus of elasticity	≥1800MPa	3,489.6

It can be seen from the comparison of the foregoing embodiments that the die head for an extruder provided by the present invention can significantly increase the output of the product and ensure that the quality of the processed wood-plastic composite material meets the use requirements.

The basic principles, main features and characteristics of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the foregoing embodiments. The foregoing embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and improvements fall within the scope of the claimed invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. A die head for an extruder, characterized in that it comprises:

   The splitter die head (10) is formed by combining the upper die body (11) and the lower die body (12);

   The splitting die (10) is connected to the barrel (1) of the extruder via a transition sleeve (20), and a runner (30) is provided in the splitting die (10), and the runner ( 30) Extending from the rear end to the front end of the splitting die (10) and forming two independent branch runners (31), the discharge ports of the two branch runners (31) are connected with a forming die (40).
2. The die head for an extruder according to claim 1, characterized in that the two branch runners (31) have the same size and are symmetrically arranged in the splitter die head (10).
3. The die head for an extruder according to claim 1, wherein the discharge port of the branch channel (31) is provided with a threaded disk (32), and the threaded disk (32) is provided along its circumference. Threaded holes arranged at intervals for bolts to penetrate and fix to the upper mold body (11) and the lower mold body (12);

   A first connecting plate (33) arranged coaxially is fixed on the threaded tooth plate (32), and the first connecting plate (33) is connected to the second connecting plate provided at the end of the forming mold (40). (34) The connection is fixed.
4. A wood-plastic extruder, characterized in that the wood-plastic extruder has a die for the extruder according to any one of claims 1-3.
5. The wood-plastic extruder according to claim 4, wherein the main engine speed of the wood-plastic extruder is 650-730 rpm; and the feeding speed is 1200-1400 rpm.

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