Hopper device for feeding polyester crushed material into filterability test screw

Abstract

The utility model provides a hopper device for feeding polyester crushed materials into a filterability test screw. The hopper device comprises a conical hopper arranged above an inlet of a screw machine, a material cover is detachably arranged at the upper end of the hopper; a feeding pipe is arranged on the upper side of the material cover; an upper cover is detachably arranged at the upper end of the feeding pipe; a magnetic assembly is arranged in the feeding pipe; the base is arranged on the bottom face of the hopper, a through hole is formed in the center of the base in the axial direction in a penetrating mode, and the base is fixedly connected with an inlet of the screw machine; the interior of the hopper is communicated with an inlet of the screw machine; the nitrogen input pipe is arranged on the material cover, is used for introducing nitrogen and is communicated with the interior of the hopper; the stirring device is arranged in the hopper and is connected with a stirring motor arranged on the material cover; the hot air inlet is formed in the lower side surface of the hopper and is communicated with an inner cavity of the hopper; the hot air outlet is formed in the upper side face of the hopper and communicated with the inner cavity of the hopper.

Description

Technical Field

[0001] The utility model relates to the field of material analysis, in particular to a hopper device for feeding polyester crushed materials through a filterability testing screw. Background Art

[0002] During the filterability analysis of polyester milling material, the material is dried and placed in a feed hopper. It is then extruded and melted by a screw at approximately 300°C. The material is then driven by a gear pump and discharged through a filterability test screen. Impurities in the melt can remain on the filterability test screen, causing clogging and increasing pressure. The pressure increase curve can be used to determine the amount of impurities in the melt.

[0003] However, during the feeding process, polyester shreds tend to accumulate in the hopper above the feed screw, making it difficult to feed the polyester shreds downward. To ensure stable die pressure, the screw, which is lacking material, needs to increase its speed. Failure to resume feeding will cause the experiment to pause and the experimental pressure to drop sharply. Resuming feeding will also cause excessive die pressure due to the high speed, which will greatly increase the instability of the experimental results.

[0004] Moreover, during the feeding process, due to the effect of electrostatic force, the polyester crushed material will stick to the inner wall of the hopper, which will have an adverse effect on the precise control of the material feeding amount, thereby increasing the uncertainty of the experimental results.

[0005] Therefore, designing a hopper device for feeding polyester crushed material with a filter test screw is of great significance to solving the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings, the purpose of the utility model is to provide a hopper device for feeding polyester crushed materials with a filter test screw. The device has a simple structure and does not require excessive operation, thereby alleviating the difficulty of feeding polyester crushed materials. The polyester crushed materials stuck on the inner wall of the hopper can be blown away through the transparent acrylic hopper and the retractable and rotatable nitrogen inlet pipe, and the feeding situation of the screw can be known more intuitively.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A hopper device for feeding polyester crushed material through a filterability testing screw, comprising:

[0009] A conical hopper is provided above the screw machine inlet; a cover is detachably provided on the upper end of the hopper; a feed pipe is provided on the upper side of the cover; a top cover is detachably provided on the upper end of the feed pipe; a magnetic assembly is provided inside the feed pipe;

[0010] A base is provided on the bottom surface of the hopper, wherein a through hole is provided in the center of the base along its axial direction, and the base is fixedly connected to the inlet of the screw machine; the interior of the hopper is in communication with the inlet of the screw machine;

[0011] a nitrogen inlet pipe provided on the material cover for introducing nitrogen, the nitrogen inlet pipe being in communication with the interior of the hopper;

[0012] A stirring device is provided inside the hopper, and the stirring device is connected to a stirring motor provided on the material cover;

[0013] A hot air inlet is provided on the lower side of the hopper, and the hot air inlet is communicated with the internal chamber of the hopper;

[0014] A hot air outlet is provided on the upper side of the hopper, and the hot air outlet is communicated with the inner chamber of the hopper.

[0015] Preferably, the upper cover is provided with an exhaust hole along its axial direction for discharging the gas inside the hopper; the exhaust hole is provided with a detachable rubber plug.

[0016] Preferably, the outer diameter of the magnetic assembly is less than 6 cm; the diameter of a single cylindrical strong magnetic rod of the magnetic assembly is 1 cm, the two strong magnetic rods are spaced 1 cm apart, and the upper and lower layers of strong magnetic rods are stacked vertically.

[0017] Preferably, it further comprises: a temperature sensor provided at the connection between the hot air inlet and the hopper.

[0018] Preferably, a rubber pad is provided between the material cover and the hopper; a first external thread is provided on the outer circumference of the lower part of the material cover, and a first internal thread matching the first external thread is provided on the inner circumference of the upper part of the hopper; a second external thread is provided on the outer circumference of the lower part of the upper cover, and a second internal thread matching the second external thread is provided on the inner circumference of the upper part of the feeding pipe.

[0019] Preferably, the diameter of the exhaust hole is 1 cm to 1.5 cm.

[0020] Preferably, the nitrogen inlet pipe is telescopic and rotatable, and can be adjusted to extend 4 to 18 cm into the hopper and can be rotated 360 degrees; a rubber ring is provided at the connection between the telescopic and rotatable nitrogen inlet pipe and the material cover.

[0021] Preferably, the stirring device is provided with a stirring shaft penetrating the hopper, with a length of 4 mm to 5 mm above the outer peripheral side of the screw.

[0022] Preferably, the hopper is made of transparent acrylic.

[0023] Preferably, the hot air inlet and the hot air outlet are each provided with a valve.

[0024] Compared with the traditional technical solution, the beneficial effects of the utility model are:

[0025] 1) The hopper of the filterability test screw feeding polyester crushed material is made of transparent acrylic material, which provides high visibility and allows for direct observation of the feeding status of the hopper, preventing the screw from spinning due to empty material. A retractable and rotating nitrogen port also removes polyester crushed material adhering to the inner wall of the hopper due to static electricity, ensuring that the material enters the screw completely.

[0026] 2) Install a cover on the feed pipe. After feeding is complete and nitrogen is introduced, close the cover to allow the nitrogen atmosphere in the hopper to exchange with the air. Install a removable rubber plug on the vent hole to ensure airtightness and prevent the polyester crushed material from splashing when excessive nitrogen is introduced. Remove the rubber plug to relieve pressure in the hopper.

[0027] 3) The distance between the bottom surface of the base and the outer peripheral side of the screw is 3cm to 4cm. The extrusion and melting feeding effects of the material after entering the screw are better.

[0028] 4) The rubber cushion ensures that the hopper has a certain degree of air tightness.

[0029] 5) The material cover is connected to the hopper by thread, and the feed pipe is connected to the upper cover by thread, which makes installation and disassembly more convenient.

[0030] 6) The magnetic component in the feed pipe can absorb impurities such as iron filings that are present in the polyester pulverized material during the pulverization process or that are already present in the material, preventing the impurities from entering the screw and causing damage to the extruder.

[0031] 7) The stirring device passes through the hopper to the upper side of the outer periphery of the screw. Through rotation, the stirring blades can break up the polyester crushed materials accumulated at the bottom of the hopper. The threaded conical stirring shaft can push the polyester crushed materials into the screw, making the screw feeding smoother.

[0032] 8) The hot air inlet is located on the lower side of the hopper, and the hot air outlet is located on the upper side of the hopper, following the "bottom-in, top-out" heat exchange principle, which has a high heat exchange efficiency. Heating the polyester crushed material with hot air can preheat the screw feed. At a certain temperature, the polyester crushed material is less likely to absorb moisture, ensuring the stability of the test results.

[0033] 9) A temperature sensor is installed at the hot air inlet to adjust the heating efficiency according to the inlet temperature. The hot air from the hot air outlet is circulated to the hot air heating device, which meets the needs of energy saving and environmental protection.

[0034] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be employed. It should be understood that the scope of the embodiments of the present invention is not limited thereby.

[0035] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0036] It should be emphasized that the term "include / comprising" when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying any creative labor.

[0038] Figure 1 A diagram of an apparatus provided for one embodiment of the utility model;

[0039] Figure 2 A diagram of a magnetic assembly device provided in one embodiment of the present utility model;

[0040] Description of reference numerals:

[0041] 1. Hopper; 2. Base; 3. Hopper cover; 4. Nitrogen inlet pipe; 5. Feed pipe; 6. Magnetic assembly; 7. Feed pipe cover; 8. Stirring motor; 9. Stirring device; 10. Hot air inlet; 11. Hot air outlet; 12. Temperature sensor. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0043] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] During the filterability analysis of polyester crumbs, the material is dried and fed into a feed hopper. It is extruded and melted by a screw at approximately 300°C, then driven by a gear pump and discharged through a filter test screen. Impurities in the melt can remain on the filter test screen, causing blockage and increased pressure. The pressure rise curve can be used to assess the level of impurities in the melt. However, during the feeding process, polyester crumbs can easily accumulate in the hopper above the feed screw, making it difficult to feed the material downward. To maintain stable die pressure, the screw speed must be increased if it is depleted of material. Failure to resume feeding will result in a pause in the experiment and a sudden drop in pressure. Resuming feeding can also cause excessive die pressure due to excessive speed, significantly increasing the instability of the test results. Furthermore, during the feeding process, electrostatic forces can cause the polyester crumbs to adhere to the inner wall of the hopper, negatively impacting the precise control of the material feed rate and increasing the uncertainty of the test results.

[0046] To overcome the above problems, please refer to Figure 1 、 Figure 2, an embodiment of the present invention provides a hopper device for feeding polyester crushed material with a filterability test screw, comprising a conical double-layer hopper 1 arranged above a screw machine inlet (not shown), a base 2 arranged on the bottom surface of the hopper 1, a material cover 3 detachably arranged on the upper end of the hopper 1, a retractable and rotatable nitrogen inlet pipe 4 for introducing nitrogen arranged on the upper side of the material cover 3, a feeding pipe 5 arranged on the upper side of the material cover 3, a magnetic component 6 arranged inside the feeding pipe 5, a material cover 7 arranged on the upper side of the feeding pipe 5, a stirring motor 8 arranged on the upper side of the material cover, a stirring device 9 arranged inside the hopper, a hot air inlet 10 arranged on the lower side of the hopper 1, a hot air outlet 11 arranged on the upper side of the hopper 1, and a temperature sensor 12 arranged at the connection between the hot air inlet 9 and the hopper 1. The material of the hopper 1 is polymethyl methacrylate (PMMA), commonly known as acrylic, which is transparent and visible. A through hole is provided axially through the center of the base 2. This through hole leads to the screw machine inlet. The base 2 is fixedly connected to the screw machine inlet, the interior of the hopper 1 is connected to the screw machine inlet, the nitrogen inlet pipe 4 is connected to the interior of the hopper 1, the stirring device 9 is connected to the stirring motor 8, the hot air inlet 10 is connected to the internal chamber of the hopper 1, and the hot air outlet 11 is connected to the internal chamber of the hopper 1.

[0047] In this embodiment, the hopper 1 is constructed as an inverted cone with a small cylinder at the bottom. Polyester shreds easily accumulate at the junction of the cone and cylinder and in the cylinder below. The screw extruder generates pressure by squeezing the polyester shreds and their melt, making it difficult for the accumulated material to fill the screw. The stirring device 9 breaks up and propels the accumulated polyester shreds, ensuring smooth feeding and improving experimental accuracy.

[0048] The entire device has a simple structure and is easy to install and disassemble. Specifically, the hopper 1 is 50 cm ± 2 cm tall and is a conical double-layer hopper with an inner diameter of 50 cm and an outer diameter of 55 cm. The cover 3 has a maximum outer diameter of 56 cm. The retractable and rotatable nitrogen inlet pipe 4 has an inner diameter of 8 mm and can extend 4 to 18 cm into the hopper. The nitrogen inlet pipe 4 has an insertion portion that inserts into the interior chamber of the hopper 1. A rubber ring is provided at the connection between the nitrogen inlet pipe 4 and the cover 5. The nitrogen inlet pipe 4 slides to adjust the length of its insertion into the hopper from 4 to 18 cm and can rotate 360 ​​degrees. The retractable and rotatable nitrogen inlet pipe 4 also has a closable and openable valve, which, through its telescopic rotation, purges the inner wall of the inserted portion of the hopper. The rubber ring maintains a seal between the nitrogen inlet pipe 4 and the cover 5 during rotation. Alternatively, the nitrogen inlet pipe 4 can be sealed with the material cover 3 via a leather cup. In this case, the connection between the nitrogen inlet pipe 4 and the material cover is still provided with a rubber ring, which is retractable and rotatable. The feed pipe 5 has an inner diameter of 6 cm, a height of 8 cm, and a wall thickness of 2 mm to 5 mm. The upper cover 7 of the feed pipe 5 has a maximum diameter of 7 cm.

[0049] like Figure 1 As shown, the upper end of the feed pipe 5 is detachably provided with an upper cover 7, which can isolate the air. After the feeding is completed and the nitrogen replacement is performed, the upper cover 7 is closed to reduce the gas exchange between the nitrogen environment of the hopper 1 and the outside air. Furthermore, the upper cover 7 is provided with an exhaust hole 701 for discharging the gas inside the hopper 1 along its axial direction, and is provided with a rubber plug of the same size, providing good airtightness and blocking the splashing of the polyester powder when the inner wall is purged. When pressure relief is required, the plug can be removed. The feed cover 5 and the upper cover 8 are both stepped structures and will not be described in detail.

[0050] like Figure 1 As shown, the distance between the bottom surface of the base 2 and the outer peripheral side of the screw in the screw machine is 3cm to 4cm (that is, the bottom surface of the base 2 is located above the screw and is 3cm to 4cm away from the screw of the screw machine). In this way, the height of the polyester crushed material is more reasonable. If the distance between the bottom surface of the base 3 and the outer peripheral side of the screw is less than 3cm, it is easy to cause the inlet of the screw machine 1 to be blocked. If the distance between the bottom surface of the base 3 and the outer peripheral side of the screw is greater than 4cm, it will lead to a decrease in extrusion melting efficiency. Figure 1 As shown, the base 2 is a square. Specifically, the side length of the base 2 is 11 cm, and it is horizontally fixed to the inlet of the screw machine by screws.

[0051] like Figure 1As shown, a rubber cushion is provided between the material cover 3 and the hopper 1 to ensure a certain airtightness of the hopper 1. The material cover 5 is provided with a first external thread on the outer circumference of the lower portion, and the hopper 1 is provided with a first internal thread on the inner circumference of the upper portion thereof to match the first external thread. The upper cover 8 is provided with a second external thread on the outer circumference of the lower portion thereof, and the feed pipe 7 is provided with a second internal thread on the inner circumference of the upper portion thereof to match the second external thread. The threaded connection facilitates installation and removal.

[0052] like Figure 1 As shown, the diameter of the exhaust hole 701 is 1 cm to 1.5 cm, which has a good exhaust effect and reduces the entry of air. If the exhaust hole 701 is less than 1 cm, exhaust is difficult and it is easy to be stuffy, resulting in the pressure in the hopper 1 cannot be released in time. If the exhaust hole 701 is larger than 1.5 cm, the exhaust is too fast, which may cause an increase in the amount of air entering. Therefore, the diameter of the exhaust hole 701 is within a reasonable range of 1 cm to 1.5 cm.

[0053] Figure 2 As shown, the magnetic assembly is tangentially fixed within a 6cm diameter circle drawn around its center and can be clamped into the fixed ring inside the feed tube. The entire magnetic assembly is composed of two layers, each with three strong magnetic rods of corresponding lengths stacked vertically, with 1cm spacing between strong magnetic rods in the same layer. Each strong magnetic rod is a 1cm diameter cylinder.

[0054] like Figure 1 As shown, the stirring motor 8 is a rounded square cylinder, which is vertically fixed to the upper part of the material cover 3 by screws. The stirring device 9 is a stirring shaft that passes through the hopper 1 to 4mm to 5mm from the outer circumference of the screw. There are four stirring blades (not shown) fixed to the stirring shaft below. The diameter of the circle surrounded by the four stirring blades is slightly smaller than the diameter of the cylinder at the connection between the hopper and the screw. The lower part of the stirring shaft is a sharp conical thread that extends into the connection between the hopper and the screw to facilitate the dispersion of the accumulated polyester crushed material.

[0055] like Figure 1 As shown, the hot air inlet is located on the lower side of the hopper, and the hot air outlet is located on the upper side. This adheres to the "bottom-in, top-out" heat exchange principle, resulting in high heat exchange efficiency. Heating the polyester shreds with hot air preheats the feed screw. Furthermore, the polyester shreds at a certain temperature are less likely to absorb moisture, ensuring stable test results. The recycling of hot air also adheres to energy-saving and environmentally friendly concepts.

[0056] The specific operating process of the device of this embodiment is as follows: the material is drawn into the hopper 1 by the magnetic assembly 6 in the feed pipe 5. The hot air heating device is activated, and the valves of the hot air inlet 10 and the hot air outlet 11 are opened to heat the material. The valve of the nitrogen inlet pipe 4 is opened to displace the air, and then the nitrogen and feed pipe cover 7 are closed. The stirring motor 8 is turned on, and the stirring device 9 is used to stir the polyester pulverized material accumulated below the hopper, and screw feeding is initiated. When the polyester pulverized material has fallen a considerable distance, the valve of the nitrogen inlet pipe 4 is opened, and the inner wall of the hopper is purged through the retractable and rotatable nitrogen inlet pipe 4. After the purging is completed, the rubber plug of the feed pipe vent 701 is opened to balance the pressure and prevent excessive pressure inside the hopper 1 from causing melt bubbling.

[0057] Any numerical value cited herein includes all values ​​of the lower and upper values ​​in increments of one unit from the lower limit to the upper limit, provided that there is an interval of at least two units between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (e.g., temperature, pressure, time, etc.) is set forth to be from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, it is intended to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples intended to be clearly expressed, and it can be considered that all possible combinations of the numerical values ​​listed between the minimum and maximum values ​​are explicitly set forth in this specification in a similar manner.

[0058] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. When used with a range, "about" or "approximately" applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the specified endpoints.

[0059] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." when describing a combination should include the identified elements, ingredients, components, or steps and other elements, ingredients, components, or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, components, or steps herein also contemplates embodiments consisting essentially of these elements, ingredients, components, or steps. By using the term "may," it is intended to indicate that any attribute described as "may" be optional.

[0060] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0061] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a disclaimer of such subject matter, nor should it be considered that the inventors did not consider such subject matter to be part of the disclosed utility model subject matter.

Claims

1. A filterability test screw feeding hopper device for polyester crushed material, characterized in that: include: A conical hopper is provided above the screw machine inlet; a cover is detachably provided on the upper end of the hopper; a feed pipe is provided on the upper side of the cover; a top cover is detachably provided on the upper end of the feed pipe; a magnetic assembly is provided inside the feed pipe; A base is provided on the bottom surface of the hopper, wherein a through hole is provided in the center of the base along its axial direction, and the base is fixedly connected to the inlet of the screw machine; the interior of the hopper is in communication with the inlet of the screw machine; a nitrogen inlet pipe provided on the material cover for introducing nitrogen, the nitrogen inlet pipe being in communication with the interior of the hopper; A stirring device is provided inside the hopper, and the stirring device is connected to a stirring motor provided on the material cover; A hot air inlet is provided on the lower side of the hopper, and the hot air inlet is communicated with the internal chamber of the hopper; A hot air outlet is provided on the upper side of the hopper, and the hot air outlet is communicated with the inner chamber of the hopper.

2. The hopper device for feeding polyester crushed material through a filterability testing screw according to claim 1, characterized in that: The upper cover is provided with an exhaust hole along its axial direction for discharging the gas inside the hopper; the exhaust hole is provided with a detachable rubber plug.

3. The hopper device for feeding polyester crushed material through a filterability testing screw according to claim 2, characterized in that: The outer diameter of the magnetic assembly is less than 6 cm; the diameter of a single cylindrical strong magnetic rod of the magnetic assembly is 1 cm, the two strong magnetic rods are spaced 1 cm apart, and the upper and lower layers of strong magnetic rods are stacked vertically.

4. The hopper device for feeding polyester crushed material through a filterability testing screw according to claim 1, characterized in that: Also includes: A temperature sensor is provided at the connection between the hot air inlet and the hopper.

5. The hopper device for feeding polyester crushed material through a filterability testing screw according to claim 1, characterized in that: A rubber pad is provided between the material cover and the hopper; a first external thread is provided on the outer circumference of the lower part of the material cover, and a first internal thread matching the first external thread is provided on the inner circumference of the upper part of the hopper; a second external thread is provided on the outer circumference of the lower part of the upper cover, and a second internal thread matching the second external thread is provided on the inner circumference of the upper part of the feeding pipe.

6. The hopper device for feeding polyester crushed material through a filterability testing screw according to claim 3, characterized in that: The diameter of the exhaust hole is 1 cm to 1.5 cm.

7. The hopper device for feeding polyester crushed material through a filterability testing screw according to claim 1, characterized in that: The nitrogen inlet pipe is telescopic and rotatable, and can be adjusted to extend into the hopper by 4 to 18 cm and can be rotated 360 degrees. A rubber ring is provided at the connection between the telescopic and rotatable nitrogen inlet pipe and the material cover.

8. The hopper device for feeding polyester crushed material through a filterability testing screw according to claim 1, characterized in that: The stirring device is provided with a stirring shaft penetrating the hopper, with a length of 4 mm to 5 mm above the outer peripheral side of the screw.

9. The hopper device for feeding polyester crushed material through a filterability testing screw according to claim 1, characterized in that: The material of the hopper is transparent acrylic.

10. The hopper device for feeding polyester crushed material through a filterability testing screw according to claim 1, characterized in that: The hot air inlet and the hot air outlet are respectively provided with a valve.

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