Production process of aluminum-plastic-aluminum packaging for silkworm moth male capsule

Abstract

The application discloses a production process of aluminum-plastic-aluminum packaging of silkworm moth male supplement capsules, and relates to the technical field of packaging production. The punch is pressed downward to press the aluminum-plastic blister material into the forming hole, the pressing operation is changed from line contact to surface contact between the aluminum-plastic blister material, different-depth and different-width blisters are formed, the punch is reset from surface contact to line contact again after the blister is formed, the contact surface with the inner wall of the formed blister is reduced, the phenomenon of adhesion is avoided, rapid forming and rapid demolding are realized, and the punch is convenient for entering the next punching action after being upwardly reset.

Description

Technical Field

[0001] This invention relates to the field of packaging production technology, specifically to a production process for aluminum-plastic-aluminum packaging of silkworm moth supplement capsules. Background Technology

[0002] Silkworm Moth Tonic Capsules are a traditional Chinese medicine whose main functions include tonifying the kidneys and strengthening yang, nourishing blood, and replenishing essence. They are used for kidney yang deficiency, impotence, premature ejaculation, and sexual dysfunction. The packaging of Silkworm Moth Tonic Capsules needs to be moisture-proof to maintain the efficacy of the medicine. Aluminum-plastic blister packaging is commonly used, a common form of pharmaceutical packaging that is moisture-proof, light-proof, airtight, and provides good sealing, protecting the quality and stability of the medicine. During the packaging process, a blister forming machine heats and stamps the aluminum-plastic blister material into blister packs of a specific shape and size. The blister packs will then contain the Silkworm Moth Tonic Capsules. Heat-sealing technology is then used to heat-seal the hot aluminum foil layer, ensuring the Silkworm Moth Tonic Capsules are sealed in a relatively enclosed and independent space, completing the packaging operation.

[0003] In actual use, existing flat-plate aluminum-plastic-aluminum blister packaging machines heat and stamp the aluminum-plastic blister material using an intermittent up-and-down motion. After stamping, the material softens due to the heat and sticks to the punch. This causes the material to be carried away from the conveyor when the punch returns to its original position for the next stamping action, affecting the blister's entry into the next process and also hindering the punch from stamping again. Therefore, a new aluminum-plastic-aluminum packaging process for silkworm moth supplement capsules has been designed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a production process for aluminum-plastic-aluminum packaging of silkworm moth supplement capsules to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a production process for aluminum-plastic-aluminum packaging of silkworm moth supplement capsules, comprising the following steps:

[0006] S1. Blister Forming: A blister forming machine is used. The blister forming machine is equipped with a stamping structure for blister forming. The stamping structure heats the aluminum-plastic blister material and stamps it into a blister. The depth of the forming hole of the stamping structure is adjusted to stamp out blister of different sizes to accommodate capsules of different sizes.

[0007] S2, Capsule filling: Place the silkworm moth supplement capsules one by one into the pre-formed blister packs;

[0008] S3. Heat sealing: After the capsules are filled, a layer of hot aluminum foil is heat-sealed onto the plastic part of the blister pack using a heat sealing device. Then, a layer of aluminum foil is heat-sealed onto the other side of the blister pack to form a sealed packaging unit.

[0009] In a further embodiment, the molding machine includes a molding table mounted above the adjustment seat, the molding table having a molding hole, a punch adjustable to press down to press the aluminum-plastic blister material into the molding hole, and a bottom block for vertical adjustment being provided inside the molding hole.

[0010] The stamping structure drives the punch to press down continuously, which means that there is a line contact with the aluminum-plastic blister material, and the contact area is the smallest. As the punch continues to press down, the end of the punch squeezes the aluminum-plastic blister material against the upper side wall of the base block. The punch continues to press down. At this time, the aluminum-plastic blister material is no longer stretched by the downward pressure, and the two bending deformation ends of the punch no longer press down to reduce their height. The punch is limited by the top wall of the base block and will bend and deform to the side that is far away from each other. At this point, the line contact is transformed into a surface contact with the aluminum-plastic blister material, which expands the contact area and at the same time expands the width of the blister.

[0011] As the height of the adjusting base block inside the forming hole decreases, the depth to which the punch enters the forming hole 31 increases, thereby increasing the depth of blister forming.

[0012] Adjusting the bottom block upwards results in a shallower depth of the punch entering the forming hole, and a shallower depth of blister formation.

[0013] In a further embodiment, the punch includes a connecting portion and a stamping portion fixed to the bottom wall of the connecting portion;

[0014] The two bending and deforming ends of the two stamping sections are in close contact with each other. The first part to come into contact with the aluminum-plastic blister material is the end of the two bending and deforming ends that are in close contact with the aluminum-plastic blister material, which is the smallest contact area. As the punch continues to press down, the ends of the two bending and deforming ends squeeze the aluminum-plastic blister material against the upper side wall of the base block. After the punch continues to press down, the two bending and deforming ends will bend and deform to the side away from each other to widen the blister width.

[0015] In a further embodiment, the width of the forming hole is greater than the gap between the two stamping parts on the bottom wall of the same connecting part, and the forming hole space satisfies the lateral tensile bending deformation of the bending deformation ends of the two stamping parts.

[0016] In a further embodiment, the adjusting seat is provided with an adjusting groove for the lifting seat to slide up and down. An I-shaped slider is fixed to the inner side wall of the adjusting groove. A guide plate is provided on the bottom wall of the lifting seat. The lifting seat is slid up and down along the outer wall of the I-shaped slider using the guide plate. The guide plate drives the lifting seat to rise and fall, adjusting the height of the bottom block in the forming hole.

[0017] In a further embodiment, L-shaped brackets are fixed on both the front and rear sides of the lifting seat, and I-shaped wheels are fixed at the ends of the L-shaped brackets. The rollers run along the bottom wall of the lifting seat from front to back, which can lift the lifting seat 4 up along the adjustment groove, and the bottom block 41 rises synchronously with the lifting seat.

[0018] In a further embodiment, rotating the adjusting rod in the opposite direction can adjust the position of the sleeve along the axial direction of the adjusting rod, and slide the roller from the rear to the front side wall. As the roller rolls in the opposite direction along the bottom wall of the lifting seat, the lifting seat, limited by its own weight, will automatically fall along the adjusting groove to adjust its height.

[0019] In a further embodiment, a T-shaped buffer groove is provided on the bottom wall of the connecting part, and T-shaped sliding rods are fixed on the upper side walls of the bending deformation ends of the two stamping parts, and the upper ends of the two T-shaped sliding rods are slidably inserted into the T-shaped sliding groove.

[0020] In a further embodiment, the front and rear width of the T-shaped buffer groove is set to be equal to the sum of the front and rear thicknesses of the two T-shaped slide bars; the bottom end of the T-shaped slide bar abuts against the upper side wall of the bending deformation end of the stamping part, and after the bending deformation end abuts against the upper side wall of the bottom block, the end of the bending deformation end bends and expands outward.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention relates to a production process for aluminum-plastic-aluminum packaging of silkworm moth male supplement capsules. The forming device employs an adjustable punch that presses the aluminum-plastic blister material into the forming hole, changing the contact between the punch and the blister material from line contact to surface contact during the pressing and forming operation. This produces blister packs of varying depths and widths to meet the packaging requirements of different specifications of silkworm moth male supplement capsules. After the blister is formed, the punch returns to its original position, moving from surface contact back to line contact. This process reduces the contact area with the inner wall of the formed blister, preventing adhesion and enabling rapid forming and demolding, thus improving forming efficiency and facilitating the next stamping operation after the punch returns to its original position. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the assembly structure of the adjusting seat, stamping table, and lifting seat of the present invention.

[0025] Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle;

[0026] Figure 4 This is a schematic diagram of the lifting seat structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the adjusting component structure of the present invention;

[0028] Figure 6 This is a partial side view of the punch and base block structure of the present invention;

[0029] Figure 7This is a side view of the punch bending deformation of the present invention;

[0030] Figure 8 A half-sectional view of the further improved structure of the punch of the present invention;

[0031] Figure 9 A cross-sectional view showing the further improved bending deformation of the punch of the present invention.

[0032] In the diagram: 1. Machine base; 2. Adjusting seat; 21. Adjusting rod; 22. Sleeve; 23. Roller; 24. Guide wheel; 3. Forming table; 31. Forming hole; 32. Electric heating element; 4. Lifting seat; 41. Base block; 42. L-shaped bracket; 43. I-beam wheel; 44. Guide plate; 45. I-beam slider; 5. Lifting part; 6. Lifting frame; 7. Connecting part; 8. Stamping part; 81. T-shaped slide bar. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0034] This embodiment provides a production process for aluminum-plastic-aluminum packaging of silkworm moth supplement capsules, including the following steps:

[0035] S1. Blister Forming: Before forming, material preparation includes: Aluminum-plastic blister packs: a composite material made of aluminum foil and plastic (usually PVC or PE) with good sealing, moisture resistance, and light protection; Capsules: pre-prepared silkworm moth capsules; Using a blister forming machine, which has a stamping structure for forming blister packs, the aluminum-plastic blister material is heated and stamped into blister packs of varying depths and widths to hold the capsules.

[0036] S2. Capsule filling: Place the silkworm moth male supplement capsules one by one into the pre-formed blister packs; this process requires ensuring that the number, position, and orientation of the capsules in each blister pack are accurate;

[0037] S3. Heat sealing: After the capsules are filled, a layer of hot aluminum foil is heat-sealed onto the plastic part of the blister pack using a heat sealing device. Then, a layer of aluminum foil is heat-sealed onto the other side of the blister pack to form a sealed packaging unit.

[0038] This process requires precise temperature and time control to ensure a strong seal and capsule safety. After heat sealing, the packaged silkworm moth supplement capsules undergo quality inspection, including visual inspection, sealing tests, and dimensional checks, to ensure the packaging meets quality requirements. Necessary labeling information, such as product name, specifications, production date, expiration date, and batch number, is printed or affixed to each packaging unit. The packaged silkworm moth supplement capsules are then boxed in specific quantities and placed in a warehouse awaiting shipment.

[0039] The production process of aluminum-plastic-aluminum packaging for silkworm moth supplement capsules also includes a blister forming device for blister forming, such as... Figure 1 , Figure 2 and Figure 3 As shown, the molding structure includes a base 1, an adjustment seat 2 on the base 1, and a molding stage 3 mounted above the adjustment seat 2. The molding stage 3 has multiple molding holes 31 arranged in a matrix. An electric heating element 32 is embedded in the molding stage 3 at the edge of the molding holes 31. The electric heating element 32 is connected to an electric heating module embedded in the base 1 to generate heat and heat the aluminum-plastic blister material passing through the molding stage 3, facilitating the blister molding operation. It is important to note that by heating only the aluminum-plastic blister material around the molding holes 31, the heating range is suitable, limited to the aluminum-plastic blister material around the molding holes 31. Other parts of the aluminum-plastic blister material will not be heated and softened, preventing excessive deformation during the molding process, which could result in the molded blister material being thinner than the preset thickness, affecting the overall strength. Therefore, only the aluminum-plastic blister material around the molding holes 31 is heated and softened, ensuring the molding requirements are met while preventing excessive stretching of other parts of the material.

[0040] A support portion extends upward from the upper side of the base 1, and a lifting portion 5 extends laterally from the upper end of the support portion, located above the forming table 3. Multiple laterally bending and extending punches are adjustablely mounted below the lifting portion 5, such as... Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, specifically, the punch includes a connecting part 7 and a stamping part 8 fixed to the bottom wall of the connecting part 7. The connecting parts 7 of multiple punches are distributed in a matrix structure. A connecting block connects two adjacent connecting parts 7. A hydraulic cylinder is embedded in the bottom wall of the lifting part 5. The end of the hydraulic cylinder slides out of the bottom wall of the lifting part 5 and is fixed to the lifting frame 6. Lifting rods extend downward from the four corners of the lifting frame 6. The four lifting rods are fixedly connected to the upper side wall of the connecting part 7 located at the four corners. The extension or retraction end of the hydraulic cylinder stretches or contracts, driving the lifting frame 6 to move up and down synchronously, thereby lifting multiple punches assembled together above the forming table 3, that is, entering the forming hole 31 and sliding upward from the forming hole 31 to detach.

[0041] Furthermore, the punch and the forming hole 31 are arranged vertically opposite each other. The punch can be adjusted to press down and force the aluminum-plastic blister material into the forming hole 31. There are two punching parts 8, which are fixed to the two opposite edges at the bottom of the connecting part 7. The bottom ends of the two punching parts 8 are bent towards each other to form a bent deformation end, and the two bent deformation ends are in contact with each other. A lifting seat 4 is adjustable on the upper surface of the adjusting seat 2. The upper end of the lifting seat 4 is provided with a bottom block 41 that slides into each forming hole 31. The upper side wall of the bottom block 41 is a limiting side wall for the punch to enter the forming hole 31. Figure 6 and Figure 7 As shown, the two curved ends are in contact with each other, forming a straight structure at the bottom of the punch. The punch descends synchronously with the lowering lifting frame 6, heating and softening the aluminum-plastic blister material located around the forming hole 31. The punch then presses down, forcing the aluminum-plastic blister material into the forming hole 31 for blister forming. The first point of contact with the aluminum-plastic blister material is the end where the two curved ends are in contact, i.e., line contact with the aluminum-plastic blister material, resulting in the smallest contact area. As the punch continues to press down, the ends of the two curved ends squeeze the aluminum-plastic blister material against the upper side wall of the bottom block 41. The punch continues to press down, at which point the aluminum-plastic blister material is no longer stretched by the downward pressure. Figure 6 and Figure 7 As shown, at this point, the two bending deformation ends of the punch no longer press down to reduce their height. Constrained by the top wall of the base block 41, the two bending deformation ends will bend and deform towards the side furthest from each other. Thus, the line contact transforms into surface contact with the aluminum-plastic blister material, expanding the contact area and increasing the blister's forming width. The amount of lateral stretching deformation of the punch can be controlled according to the required blister forming width. Additionally, the blister forming depth can be controlled by adjusting the height of the base block 41 within the forming hole 31, thereby meeting the requirements for accommodating capsules of different sizes.

[0042] To meet the packaging requirements of silkworm moth supplement capsules of different specifications, when the punch returns to its original position after the blister is formed, the bent and deformed end loses the limit of the upper side wall of the bottom block 41 and automatically returns to its original position. This causes the bent and deformed ends of the two stamping parts 8 to change from surface contact to line contact with the inner side wall of the blister. As the punch continues to rise, it reduces the contact surface with the inner wall of the formed blister, thereby avoiding adhesion and achieving rapid forming and rapid demolding, improving forming efficiency, so that the punch can enter the next stamping action after returning to its original position.

[0043] Furthermore, the width of the forming hole 31 is greater than the gap between the two stamping parts 8 on the bottom wall of the same connecting part 7, so that there is enough space to meet the lateral stretching and bending deformation requirements of the bending deformation ends of the two stamping parts 8, thereby forming blister packs of different widths.

[0044] Furthermore, such as Figure 5 As shown, an adjustment groove for the lifting seat 4 to slide up and down is provided on the adjustment seat 2. An I-shaped slider 45 is fixed on the inner side wall of the adjustment groove. A guide plate 44 is provided on the bottom wall of the lifting seat 4. Lifting sliding holes that slide and engage with the I-shaped slider 45 are provided on the front and rear side walls of the guide plate 44. A slot for the guide plate 44 to slide up and down is provided on the upper side wall of the machine base 1. The lifting seat 4 can adjust the height of the entire lifting seat 4 by sliding the guide plate 44 up and down along the outer wall of the I-shaped slider 45, that is, adjusting the height of the bottom block 41 located in the forming hole 31. Meanwhile, an adjusting rod 21 is threadedly connected to the front side wall of the adjusting seat 2. A sleeve 22 is threadedly fitted onto the outer wall of the adjusting rod 21. A support column extends upward from the side wall of the sleeve 22. Rollers 23 are rotatably mounted on the top of the side walls of both sides of the support column. The bottom wall of the lifting seat 4 is inclined from front to back. Here, the end of the adjusting rod 21 slides through the lifting slider and rotates into the inner wall of the adjusting groove. This does not affect the sliding and lifting adjustment operation of the guide plate 44 along the outer wall of the I-shaped slider 45. By manually rotating the adjusting rod 21, the rollers 23 move from front to back along the bottom wall of the lifting seat 4, which can lift the lifting seat 4 upward along the adjusting groove. The bottom block 41 rises synchronously with the lifting seat 4. By rotating the adjusting rod 21 in the opposite direction, the sleeve 22 can be adjusted in the opposite direction along the axis of the adjusting rod 21. This allows the rollers 23 to slide from the rear to the front side wall. As the rollers 23 roll in the opposite direction along the bottom wall of the lifting seat 4, the lifting seat 4, limited by its own weight, will automatically fall along the adjusting groove to adjust its height.

[0045] The above process describes the height adjustment of the base block 41 within the forming hole 31. If a deeper blister forming depth is required, the height of the lifting seat 4 is adjusted downwards. This lowers the height of the base block 41 within the forming hole 31, allowing the punch to penetrate deeper into the forming hole 31, thus increasing the blister forming depth. Conversely, adjusting the base block 41 upwards results in a shallower penetration depth of the punch within the forming hole 31, also leading to a shallower blister forming depth.

[0046] Meanwhile, two guide wheels 24 are symmetrically rotated on the bottom wall of the sleeve 22, which roll and fit against the bottom wall of the adjusting groove. This ensures that the sleeve 22 can reciprocate along the axial direction of the adjusting rod 21 without rotating synchronously with the adjusting rod 21.

[0047] Alternatively, L-shaped brackets 42 can be fixed on both the front and rear sides of the lifting seat 4, with I-beam wheels 43 fixed to the ends of the L-shaped brackets 42. Notches for placing the I-beam wheels 43 are provided at both the front and rear ends of the forming table 3. Figure 4 As shown, the I-beam wheel 43 only plays an auxiliary role in the horizontal transmission of the blister after it has been formed by rolling support.

[0048] In this embodiment, further, such as Figure 8 and Figure 9As shown, a T-shaped buffer groove is provided on the bottom wall of the connecting part 7. T-shaped slide rods 81 are fixed on the upper side walls of the bending deformation ends of the two stamping parts 8. The upper ends of the two T-shaped slide rods 81 are slidably inserted into the T-shaped slide groove. The front and rear width of the T-shaped buffer groove is equal to the sum of the front and rear thicknesses of the two T-shaped slide rods 81. The two T-shaped slide rods 81 slide against each other. The bottom end of the T-shaped slide rod 81 abuts against the upper side wall of the bending deformation end of the stamping part 8. After the bending deformation end abuts against the upper side wall of the bottom block 41, the end of the bending deformation end undergoes bending change, instead of causing the entire stamping part 8 to undergo lateral bending change, which results in the blister forming width not being maximized.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A production process for aluminum-plastic-aluminum packaging of silkworm moth supplement capsules, characterized in that, The process includes the following steps: S1, Blister Forming: Using a blister forming machine, the blister forming machine is equipped with a stamping structure for blister forming. The stamping structure heats the aluminum-plastic blister material and stamps it into a blister. Adjust the depth of the forming hole (31) of the stamping structure to stamp out blister of different sizes to accommodate capsules of different sizes. S2, Capsule filling: Place the silkworm moth supplement capsules one by one into the pre-formed blister packs; S3. Heat sealing: After the capsules are filled, use a heat sealing device to heat seal a layer of hot aluminum foil onto the plastic part of the blister pack, and then heat seal a layer of aluminum foil on the other side of the blister pack to form a sealed packaging unit. The molding machine includes a molding table (3) mounted on the adjustment seat (2). A molding hole (31) is provided on the molding table (3). The punch can be adjusted to press down and press the aluminum-plastic blister material into the molding hole (31). A bottom block (41) with up-and-down adjustment is provided in the molding hole (31). The stamping structure drives the punch to press down continuously, that is, to make line contact with the aluminum-plastic blister material, with the smallest contact area. As the punch presses down continuously, the end of the punch squeezes the aluminum-plastic blister material against the upper side wall of the bottom block (41). The punch continues to press down, at which point the aluminum-plastic blister material is no longer pressed down and stretched, and the two bending deformation ends of the punch no longer press down to reduce the height. The punch is limited by the top wall of the bottom block (41) and will bend and deform to the side that is far away from each other. Thus, the line contact is transformed into a surface contact with the aluminum-plastic blister material, which expands the contact area and at the same time expands the width of the blister. The height of the adjusting base block (41) inside the forming hole (31) is reduced, the depth of the punch entering the forming hole (31) will be increased, and the depth of the blister forming will be increased. Adjust the bottom block (41) upwards, the punch enters the forming hole (31) to a shallower depth, and the blister forming depth is also shallower; The punch includes a connecting part (7) and a stamping part (8) fixed to the bottom wall of the connecting part (7). The two stamping parts (8) have two bent deformation ends that are in contact with each other. The first part to contact the aluminum-plastic blister material is the end of the two bent deformation ends that are in contact with the aluminum-plastic blister material. The contact area is the smallest. As the punch continues to press down, the ends of the two bent deformation ends squeeze the aluminum-plastic blister material against the upper side wall of the bottom block (41). After the punch continues to press down, the two bent deformation ends will bend and deform to the side away from each other to widen the blister width. The bottom wall of the connecting part (7) is provided with a T-shaped buffer groove, and the upper side wall of the bending deformation end of the two stamping parts (8) is fixed with a T-shaped slide rod (81), and the upper end of the two T-shaped slide rods (81) is slidably inserted into the T-shaped slide groove. The front and rear width of the T-shaped buffer groove is set to be equal to the sum of the front and rear thicknesses of the two T-shaped slide bars (81); the bottom end of the T-shaped slide bar (81) abuts against the upper side wall of the bending deformation end of the stamping part (8), and after the bending deformation end abuts against the upper side wall of the bottom block (41), the end of the bending deformation end bends outward and expands.

2. The production process of the aluminum-plastic-aluminum packaging for silkworm moth supplement capsules according to claim 1, characterized in that, The width of the forming hole (31) is greater than the gap between the two stamping parts (8) on the bottom wall of the same connecting part (7), and the space of the forming hole (31) satisfies the lateral stretching bending deformation of the bending deformation ends of the two stamping parts (8).

3. The production process of the aluminum-plastic-aluminum packaging for silkworm moth supplement capsules according to claim 1, characterized in that, The adjusting seat (2) is provided with an adjusting groove for the lifting seat (4) to slide up and down. An I-shaped slider (45) is fixed on the inner side wall of the adjusting groove. A guide plate (44) is provided on the bottom wall of the lifting seat (4). The lifting seat (4) is slid up and down along the outer wall of the I-shaped slider (45) using the guide plate (44). The guide plate (44) drives the lifting seat (4) to rise and fall, adjusting the height of the bottom block (41) in the forming hole (31).

4. The production process of aluminum-plastic-aluminum packaging for silkworm moth supplement capsules according to claim 3, characterized in that, The lifting seat (4) is fixed with L-shaped brackets (42) on both the front and rear sides. The ends of the L-shaped brackets (42) are fixed with I-shaped wheels (43). The rollers (23) run along the bottom wall of the lifting seat (4) from front to back, which can lift the lifting seat (4) up along the adjustment groove. The bottom block (41) rises synchronously with the lifting seat (4).

5. The production process of aluminum-plastic-aluminum packaging for silkworm moth supplement capsules according to claim 4, characterized in that, By rotating the adjusting rod (21) in the opposite direction, the sleeve (22) can be adjusted in the opposite direction along the axis of the adjusting rod (21), and the roller (23) can be slid from the rear to the front side wall. As the roller (23) rolls in the opposite direction along the bottom wall of the lifting seat (4), the lifting seat (4) will automatically fall down along the adjusting groove to adjust its height due to its own weight.

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