A multi-cavity injection mold for processing plastic parts of a lawn mower

Abstract

The application discloses a multi-cavity injection mold for processing lawn mower plastic parts, and relates to the technical field of lawn mower plastic injection molding, which comprises a bearing base, a bearing support fixedly installed on the top surface of the bearing base, and a lifting top plate arranged above the bearing base. The lower part of the lifting top plate and the upper part of the bearing support are respectively provided with an upper mold body and a lower mold body. The inner lower part of the bearing support is provided with an ejection mechanism and a discharging mechanism. The discharging mechanism comprises a discharging bottom plate. The multi-cavity injection mold for processing lawn mower plastic parts can process waste plastic parts by combining the upper mold body and the lower mold body, and the stripping hard tube in the discharging top plate can assist in separating the molded parts from the inner wall of the lower mold cavity. After the discharging top plate is lifted, the molded parts are driven to be ejected, so that the injection molding efficiency of waste part recycling and the qualified rate of molding are improved.

Description

Technical Field

[0001] This invention relates to the field of plastic injection molding technology for lawnmowers, specifically a multi-cavity injection mold for processing plastic parts for lawnmowers. Background Technology

[0002] Lawn mower plastic parts refer to components made of plastic materials in lawn mowers. They are mainly used in parts such as the machine body shell, protective cover, handle, and blades, serving to protect, support, and reduce weight. While providing protection, these plastic parts are prone to damage due to issues such as improper use. After recycling, they can be melt-injected and reused by molding. Multi-cavity injection molds are used for molding, improving the efficiency of melting and molding waste plastic parts from lawn mowers.

[0003] Application CN112721051A discloses a plastic injection mold that reduces collision damage between plastic parts during use, increases the yield rate of plastic parts, and enables complex plastic parts to be quickly and sealed by the cooperation of the shaping component with the first mold cavity and the second mold cavity. Furthermore, the locking block of the shaping component makes it less likely for scrap material to be generated at the bottom of the plastic part, while improving the sealing performance of the first mold cavity and the second mold cavity, thus increasing the yield rate.

[0004] Application CN118744502A discloses a plastic injection mold. A pressure tube is fixedly connected to the top of the inner wall of the mold, a mold cavity is fixedly connected to the bottom of the pressure tube, a compression tube is fixedly connected to the bottom of the mold cavity, and a side plate is fixedly connected to the inner wall of the mold. By setting a compression mechanism, the hot melt plastic in the mold cavity is compressed by multiple compression membranes. By setting this component, the volume of the hot melt plastic is reduced and the density is increased. When the hot melt plastic cools, its surface toughness is enhanced.

[0005] However, the multi-cavity injection molds for plastic parts disclosed above still have the following problems in actual use: the multi-cavity mold is used to form and eject molten material, but this ejection method adopts a direct ejection method. The plastic parts that are not fully hardened are prone to deformation and breakage due to the excessive pressure on the contact surface of the ejection mechanism. At the same time, this type of ejection mechanism needs to be adapted to the mold, which affects the demolding efficiency and the molding qualification rate.

[0006] Therefore, we propose a multi-cavity injection mold for processing plastic parts for lawnmowers to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a multi-cavity injection mold for processing plastic parts for lawnmowers. This invention addresses the problem that existing multi-cavity molds are used to mold and eject molten materials. However, such ejection methods use direct ejection, which can cause deformation and breakage of incompletely hardened plastic parts due to excessive pressure on the contact surface of the ejection mechanism. Furthermore, such ejection mechanisms require additional adaptation to the mold, affecting demolding efficiency and molding yield.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a multi-cavity injection mold for processing plastic parts of a lawnmower, comprising a support base and a support bracket fixedly installed on the top surface of the support base, wherein a lifting top plate is provided above the support base; The upper mold body and the lower mold body are respectively set below the lifting top plate and above the supporting bracket to form and process the molten waste plastic material. It also includes: a demolding mechanism is provided at the lower interior of the support bracket, and the demolding mechanism includes a demolding plug, and the demolding plug is slidably installed at the lower interior of the demolding air box; The support bracket has a discharge mechanism located at its lower interior. The discharge mechanism includes a discharge base plate, and hook sliders are symmetrically distributed at both the front and rear ends of the discharge base plate.

[0009] Preferably, the lower mold body has lower mold cavities equidistantly arranged inside the upper end, and the upper mold body has upper mold cavities equidistantly arranged inside the lower end, with the upper mold cavities and lower mold cavities corresponding to each other, for molding and processing waste plastic melt.

[0010] Preferably, the discharge mechanism includes a discharge top plate, which is slidably installed inside the lower mold cavity where the cavities are evenly distributed. The bottom center of the discharge top plate is fixedly connected to the upper end of the discharge slide rod, and the lower end of the discharge slide rod is fixedly disposed on the top surface of the discharge bottom plate.

[0011] Preferably, the discharge mechanism includes a contact branch, which is fixedly installed on the front and rear sides above the support bracket. The left and right sides of the contact branch are both attached to the middle of the discharge hook rod, and the upper end of the discharge hook rod is rotatably mounted on the front and rear sides of the upper mold body through a bearing.

[0012] Preferably, the discharge mechanism includes traction slide rods fixedly installed on the front and rear sides of the upper mold body, and the traction slide rods slide through the interior of the discharge hook rods on the left and right sides. The traction slide rods and the discharge hook rods are connected to each other by a return spring. In the initial state, the discharge hook rods are distributed in an inwardly inclined state at the lower end. After descending, the discharge hook rods flip outward by the contact of the contact branch, which is used to engage with the hook sliders on the left and right sides of the discharge base plate.

[0013] Preferably, the demolding mechanism includes demolding air holes opened at the four corners inside the discharge top plate, and a demolding top frame is slidably installed on the bottom surface of the discharge top plate through a contact spring, and the upper end of the demolding top frame is slidably installed inside the discharge top plate, and a traction bracket is fixedly installed on the inner side of the bottom surface of the demolding top frames on both the left and right sides.

[0014] Preferably, the demolding mechanism includes a traction bracket that fits into the inner end of the abutting step block, and the bottom surface of the outer end of the abutting step block slides against the upper end of the abutting slider. The lower end of the abutting slider is located on the top surface of the discharge base plate. The discharge base plate drives the abutting slider to rise, and when the abutting step block is squeezed to slide inward, it drives the traction bracket and the demolding top frame to fall, thereby opening the demolding air hole.

[0015] Preferably, the demolding mechanism includes a stripping tube, which is embedded in the left and right sides inside the discharge top plate. Both ends of the stripping tube extend into the demolding air hole, and the middle part of the stripping tube passes through the outside of the bottom surface of the discharge top plate and extends into the lower part of the support bracket.

[0016] Preferably, the demolding mechanism includes a demolding plug fixedly installed in the middle of the top surface of the discharge top plate, and the left and right ends of the demolding air box are connected to the lower end of the one-way elastic tube, and the upper end of the one-way elastic tube is connected to the lower end of the peeling hard tube.

[0017] Preferably, the demolding mechanism includes a demolding air box with a one-way air inlet valve in the middle, and the demolding air box delivers internal air to the interior of the stripping hard tube through a one-way elastic tube, and opens the end of the stripping hard tube after the demolding top frame descends, so as to spray air from above the demolding air hole into the interior of the lower mold cavity to assist in the demolding of the melted waste plastic.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This multi-cavity injection mold for processing plastic parts of lawnmowers, through the merging of the upper mold body and the lower mold body, molds waste plastic parts. The stripping hard tube inside the discharge top plate assists in separating the molded workpiece from the inner wall of the lower mold cavity, and after the discharge top plate rises, it drives the molded workpiece to be ejected, thereby improving the injection molding efficiency and molding qualification rate of waste workpiece recycling. The specific details are as follows: 1. The upper mold body is lowered by the lifting cylinders at the four corners of the supporting base plate and the lifting base plate, so that it merges with the lower mold body. Then, the molten material is transported between the upper mold cavity and the lower mold cavity to achieve the forming process.

[0019] The upper mold body drives the discharge hook rod to move downwards synchronously. After the inner inclined surface of the discharge hook rod presses against the end of the branch, it drives the discharge hook rod to rotate outwards so that after the upper mold body and the lower mold body merge, the discharge hook rod descends into place and is connected by its lower end engaging with the bottom surface of the hook slider.

[0020] 2. During mold opening, the upper mold body drives the ejector hook rod to return to its original position. The ejector hook rod drives the lifting top plate to slide upward through the engaging sliding hook slider. The plate is guided by its inclined surface and the contact branch, so that the ejector hook rod gradually slides inward during the rising process. After the ejector bottom plate rises to the position, it separates from the ejector hook rod, thus enabling subsequent injection molding operations.

[0021] 3. The rising discharge base plate is pressed against the inclined surface of the contact step block by the contact slider, causing it to slide inward. Then, the inclined surface on the inside presses the traction bracket and the demolding top frame to slide downward. After the demolding top frame slides downward, its upper end slides downward in the demolding air holes at the four corners of the discharge top plate, thus no longer blocking the outer end of the peeling hard tube, so as to assist in the forming of the workpiece and the lower mold cavity.

[0022] Furthermore, after the discharge base plate drives the demolding plug to slide upward into the demolding air box, it squeezes the space inside the demolding air box cavity and conveys it through the through-connected one-way elastic tube and the peeling hard tube. Then, the unrestricted peeling hard tube conveys air upward to the lower mold cavity, assisting in the separation of the molded workpiece from the inner wall of the lower mold cavity.

[0023] 4. The upward sliding bottom plate drives the discharge slide rod and the discharge top plate to slide upward, contacting the bottom surface of the molded workpiece through the planar structure, and the rising discharge top plate drives the molded workpiece to slide, thereby assisting in the demolding of the workpiece after the waste plastic is molded, improving injection molding efficiency and molding qualification rate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of the combined upper and lower mold bodies of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point B; Figure 5 This is a schematic diagram of the structure of the upper mold body of the present invention when it slides upward; Figure 6 This is a three-dimensional structural schematic diagram of the lower mold body of the present invention; Figure 7 This is a schematic diagram of the structure after the discharge top plate of the present invention has risen; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C; Figure 9This is a schematic diagram of the installation of the demolding air box and the one-way elastic tube of the present invention; Figure 10 This is a schematic diagram of the structure of the discharge top plate of the present invention after being cut open; Figure 11 For the present invention Figure 10 Enlarged structural diagram at point D.

[0025] In the diagram: 1. Support base; 2. Support bracket; 3. Lifting top plate; 4. Upper mold body; 5. Lower mold body; 6. Demolding plug; 7. Demolding air box; 8. Discharge bottom plate; 9. Hook slider; 10. Lower mold cavity; 11. Upper mold cavity; 12. Discharge top plate; 13. Discharge slide bar; 14. Abutment branch; 15. Discharge hook rod; 16. Traction slide bar; 17. Demolding air hole; 18. Abutment spring; 19. Demolding top frame; 20. Traction bracket; 21. Abutment step block; 22. Abutment slider; 23. Peeling hard tube; 24. Return spring; 25. One-way elastic tube. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-11 The present invention provides the following technical solution: Example 1: To address the problems existing in the injection molding process of waste plastic parts from lawnmowers, this example discloses the following technical solution: a multi-cavity injection mold for processing plastic parts from lawnmowers, comprising a support base 1 and a support bracket 2 fixedly installed on the top surface of the support base 1, with a lifting top plate 3 above the support base 1; wherein, an upper mold body 4 and a lower mold body 5 are respectively provided below the lifting top plate 3 and above the support bracket 2, for molding the molten waste plastic material; the lower mold body 5 has lower mold cavities 10 evenly spaced inside its upper end, and the upper mold body 4 has upper mold cavities 11 evenly spaced inside its lower end, with the upper mold cavities 11 and lower mold cavities 10 corresponding to each other, for molding the molten waste plastic.

[0028] The support bracket 2 has a discharge mechanism located at its lower interior. The discharge mechanism includes a discharge base plate 8, and hook sliders 9 are symmetrically distributed at the front and rear ends of the discharge base plate 8. The discharge mechanism includes a discharge top plate 12, which is slidably installed at the lower interior of the lower mold cavity 10, which is distributed at equal intervals. The middle part of the bottom surface of the discharge top plate 12 is fixedly connected to the upper end of the discharge slide rod 13, and the lower end of the discharge slide rod 13 is fixedly installed on the top surface of the discharge base plate 8.

[0029] The discharge mechanism includes a contact branch 14, which is fixedly installed on the front and rear sides of the upper support bracket 2. The left and right sides of the contact branch 14 are attached to the middle of the discharge hook rod 15. The upper end of the discharge hook rod 15 is rotatably set on the front and rear sides of the upper mold body 4 through a bearing. The discharge mechanism includes a traction slide rod 16 fixedly installed on the front and rear sides of the upper mold body 4. The traction slide rod 16 slides through the interior of the left and right discharge hook rods 15. The traction slide rod 16 and the discharge hook rod 15 are connected to each other through a return spring 24. In the initial state, the discharge hook rod 15 is inclined inward at the lower end. After descending, the discharge hook rod 15 flips outward through the contact of the contact branch 14 to engage with the hook sliders 9 on the left and right sides of the discharge base plate 8.

[0030] like Figures 1-4 As shown, the lifting cylinders at the four corners of the supporting base 1 and the upper lifting plate 3 are connected to the oil pump, so that the lifting plate 3 drives the lower upper mold body 4 to slide downward, so that after the upper mold body 4 descends, it merges with the lower mold body 5, and the molten waste plastic is transported through the material port of the upper mold body 4, so that the molten plastic enters the upper mold cavity 11 and the lower mold cavity 10 to achieve shaping.

[0031] Furthermore, when the upper mold body 4 drives the symmetrically distributed discharge hook rods 15 to slide downwards, the discharge hook rods 15 come into contact with the abutting branch 14 in the middle of the support bracket 2, and the abutting branch 14 presses the inclined surface on the inner side of the discharge hook rods 15, so that the discharge hook rods 15 rotate outwards synchronously when descending. Then, after the upper mold body 4 and the lower mold body 5 merge, the discharge hook rods 15 rotate outwards to the bottom of the hook slider 9 at the end of the discharge base plate 8, so as to cooperate for subsequent discharge.

[0032] like Figure 5As shown, after the waste plastic is molded, the upper mold body 4 drives the symmetrically distributed discharge hook rods 15 to slide upward, so that the discharge hook rods 15 drive the hook slider 9 and the discharge base plate 8 to slide upward synchronously. When the discharge hook rods 15 are about to be stopped above the support bracket 2, the discharge hook rods 15 are guided by the inner inclined surface to gradually stop contacting the abutting branch 14, so that the return spring 24 at the outer end of the traction slide rod 16 can be extended, thereby driving the discharge hook rods 15 to rotate inward and no longer contact the hook slider 9. This allows the discharge base plate 8 to separate from each other after the auxiliary molded plastic is ejected, so as to carry out the next autonomous discharge operation.

[0033] Example 2: To address the problems existing in the injection molding process of waste plastic parts from existing lawnmowers, this example discloses the following technical solution: The demolding mechanism includes demolding air holes 17 located at the four corners inside the discharge top plate 12. A demolding bracket 19 is slidably mounted on the bottom surface of the discharge top plate 12 via a contact spring 18. The upper end of the demolding bracket 19 is slidably mounted inside the discharge top plate 12. Traction brackets 20 are fixedly mounted on the inner side of the bottom surface of the demolding brackets 19 on both sides. The traction bracket 20 included in the demolding mechanism is in contact with the inner end of the contact step block 21. The bottom surface of the outer end of the contact step block 21 is slidably in contact with the upper end of the contact slider 22. The lower end of the contact slider 22 is located on the top surface of the discharge bottom plate 8. The discharge bottom plate 8 drives the contact slider 22 to rise. When the contact step block 21 is squeezed to slide inward, the traction bracket 20 and the demolding bracket 19 are driven to fall, thereby opening the demolding air holes 17.

[0034] The demolding mechanism includes a stripping tube 23, which is embedded in the left and right sides inside the discharge top plate 12. Both ends of the stripping tube 23 extend into the demolding air hole 17, and the middle part of the stripping tube 23 passes through the outside of the bottom surface of the discharge top plate 12 and extends into the lower part of the support bracket 2.

[0035] like Figures 7-8 As shown, when the discharge base plate 8 inside the support bracket 2 slides upward, it drives the contact slider 22 to move synchronously, thereby squeezing the inclined surface below the contact ladder block 21, causing the contact ladder block 21 to slide inward. The inclined surface inside the contact ladder block 21 then squeezes the traction bracket 20 and the demolding top frame 19 to slide downward. After the demolding top frame 19 stretches the contact spring 18, the upper end of the demolding air hole 17 located at the four corners of the discharge top plate 12 slides downward, thereby opening the demolding air hole 17. This facilitates the separation of the formed material from the lower mold cavity 10 by air jetting.

[0036] like Figures 10-11As shown, after the demolding bracket 19 inside the demolding air hole 17 at the four corners of the discharge top plate 12 slides downward, the cavity above the demolding air hole 17 is opened, and the end of the stripping hard tube 23 embedded inside the discharge top plate 12 is not resisted or blocked, thus facilitating subsequent air jet separation.

[0037] Example 3: In order to solve the problems existing in the injection molding process of waste plastic parts of existing lawnmowers, this example discloses the following technical solution: a demolding mechanism is provided at the lower part of the interior of the support bracket 2, and the demolding mechanism includes a demolding plug 6, and the demolding plug 6 is slidably installed at the lower part of the interior of the demolding air box 7; the demolding plug 6 included in the demolding mechanism is fixedly installed at the middle of the top surface of the discharge top plate 12, and the left and right ends of the demolding air box 7 are connected to the lower end of the one-way elastic tube 25, and the upper end of the one-way elastic tube 25 is connected to the lower end of the peeling hard tube 23.

[0038] The demolding mechanism includes a demolding air box 7 with a one-way air inlet valve in the middle. The demolding air box 7 delivers internal air to the interior of the stripping hard tube 23 through the one-way elastic tube 25. After the demolding ejector 19 descends, the end of the stripping hard tube 23 is opened to spray air from above the demolding air hole 17 into the interior of the lower mold cavity 10 to assist in the demolding of the melted waste plastic.

[0039] like Figures 9-11 As shown, the discharge base plate 8 moves the upper demolding plug 6 upward into the demolding air box 7, while squeezing the cavity space inside the demolding air box 7. This helps to transport the air inside the demolding air box 7 through the through-connected one-way elastic tube 25 to the inside of the stripping hard tube 23, and then through the end of the stripping hard tube 23 located inside the demolding air hole 17. The lower part of the demolding air hole 17 is blocked by the demolding top frame 19. The air inside the stripping hard tube 23 is transported to the lower mold cavity 10 above the discharge top plate 12, so as to help the lower mold cavity 10 separate from the plastic part inside, thereby avoiding the subsequent demolding due to adhesion.

[0040] Furthermore, after the discharge base plate 8 rises, the discharge top plate 12 moves upward synchronously through the discharge slide bar 13 on the top surface, thereby lifting the plastic parts that are separated from the inner wall of the lower mold cavity 10 upward, thus assisting in the demolding of the workpiece after the waste plastic is molded, and improving the injection molding efficiency and molding qualification rate.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 multi-cavity injection mold for processing plastic parts of a lawnmower, comprising a support base (1) and a support bracket (2) fixedly installed on the top surface of the support base (1), wherein a lifting top plate (3) is provided above the support base (1); in, The upper mold body (4) and the lower mold body (5) are respectively set below the lifting top plate (3) and above the bearing support (2) to form and process the molten waste plastic material; Its characteristic is that it further includes: A demolding mechanism is provided inside the lower part of the support bracket (2), and the demolding mechanism includes a demolding plug (6), and the demolding plug (6) is slidably installed inside the lower part of the demolding air box (7); The bearing support (2) is provided with a discharge mechanism at the bottom inside, and the discharge mechanism includes a discharge base plate (8), and hook sliders (9) are symmetrically distributed at the front and rear ends of the discharge base plate (8). The lower mold body (5) has a lower mold cavity (10) opened at equal intervals at the upper end, and the upper mold body (4) has an upper mold cavity (11) opened at equal intervals at the lower end. The upper mold cavity (11) and the lower mold cavity (10) correspond to each other and are used to form and process waste plastic melt. The discharge mechanism includes a discharge top plate (12), which is slidably installed inside the lower mold cavity (10) which is evenly distributed. The bottom center of the discharge top plate (12) is fixedly connected to the upper end of the discharge slide rod (13), and the lower end of the discharge slide rod (13) is fixedly set on the top surface of the discharge bottom plate (8). The demolding mechanism includes demolding air holes (17) opened at the four corners inside the discharge top plate (12), and a demolding top frame (19) is slidably installed on the bottom surface of the discharge top plate (12) through a contact spring (18), and the upper end of the demolding top frame (19) is slidably installed inside the discharge top plate (12), and a traction bracket (20) is fixedly installed on the inner side of the bottom surface of the demolding top frames (19) on both the left and right sides. The demolding mechanism includes a traction bracket (20) and an inner end of a contact step block (21) that are in contact with each other. The bottom surface of the outer end of the contact step block (21) slides against the upper end of the contact slider (22). The lower end of the contact slider (22) is located on the top surface of the discharge base plate (8). The discharge base plate (8) drives the contact slider (22) to rise. When the contact step block (21) is squeezed to slide inward, the traction bracket (20) and the demolding top frame (19) are driven to fall, thereby opening the demolding air hole (17). The demolding mechanism includes a stripping tube (23), which is embedded in the left and right sides inside the discharge top plate (12). Both ends of the stripping tube (23) extend into the demolding air hole (17), and the middle part of the stripping tube (23) is disposed outside the bottom surface of the discharge top plate (12) and extends to the inside of the support bracket (2).

2. The multi-cavity injection mold for processing plastic parts of a lawnmower according to claim 1, characterized in that: The discharge mechanism includes a contact branch (14), which is fixedly installed on the front and rear sides above the support bracket (2). The left and right sides of the contact branch (14) are attached to the middle of the discharge hook rod (15), and the upper end of the discharge hook rod (15) is rotatably set on the front and rear sides of the upper mold body (4) through a bearing.

3. The multi-cavity injection mold for processing plastic parts of a lawnmower according to claim 2, characterized in that: The discharge mechanism includes a traction slide rod (16) fixedly installed on the front and rear sides of the upper mold body (4), and the traction slide rod (16) slides through the inside of the discharge hook rod (15) on the left and right sides. The traction slide rod (16) and the discharge hook rod (15) are connected to each other by a return spring (24). The discharge hook rod (15) in the initial state is distributed in an inward tilt at the lower end. After descending, the discharge hook rod (15) flips outward by the contact of the contact branch (14) to engage with the hook slider (9) on the left and right sides of the discharge base plate (8).

4. The multi-cavity injection mold for processing plastic parts of a lawnmower according to claim 1, characterized in that: The demolding mechanism includes a demolding plug (6) which is fixedly installed in the middle of the top surface of the discharge top plate (12), and the demolding air box (7) is connected to the lower end of the one-way elastic tube (25) at both ends, and the upper end of the one-way elastic tube (25) is connected to the lower end of the peeling hard tube (23).

5. A multi-cavity injection mold for processing plastic parts for lawnmowers according to claim 4, characterized in that: The demolding mechanism includes a demolding air box (7) with a one-way air inlet valve in the middle. The demolding air box (7) delivers internal air to the interior of the stripping hard tube (23) through a one-way elastic tube (25). After the demolding top frame (19) descends, the end of the stripping hard tube (23) is opened to spray air from above the demolding air hole (17) into the interior of the lower mold cavity (10) to assist in the demolding of waste plastic after melting.

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