A disposable folding paper cup that is stacked flat and has a cylindrical upper end when unfolded by pressing the folding part

Abstract

The present invention relates to a disposable folding paper cup that folds into a flat shape and has a cylindrical upper end when unfolded by pressing the folding part. The paper cup includes: a cup body made of coated paper with a cup body coating on its inner surface, which forms a cylindrical shape when unfolded and forms a flat surface when its two sides are folded at the folding line; bending lines that form an oval recess, which symmetrically unfolds around both sides of each folding line when the height center part of the folding line of the cup body is pressed, and these bending lines divide the oval recess spaced apart from the upper and lower ends of the cup body; a bottom sheet, which is coated paper having a bottom sheet coating formed on its surface to be fused with the cup body coating at the inner side of the lower end of the cup body. The two ends of the bottom sheet are fused to each other once, while the bottom sheet is folded along a laterally convex transverse center folding line, and the bottom sheet is fused with the bottom edge of the folded cup body to form a bottom fusion band; and fusion columns, at these fusion columns, the front and back surfaces having a folding line in the center and the bottom sheet having ends disposed therebetween form a column shape that is higher than the fusion height of the bottom fusion band but lower than the lower end of the bending line, so that the ends of the bottom sheet are completely fused on three sides at the part where the bottom fusion band and the folding line intersect.

Description

Technical Field

[0001] The present invention relates to a disposable folding paper cup that folds into a flat shape and has a cylindrical shape when the upper end is unfolded by pressing at the folding part. Background Art

[0002] Paper cups are widely used in vending machines, offices, homes, or outdoors, and have multiple advantages such as being mass-producible, easy to handle, and enabling resource recycling.

[0003] However, such disposable paper cups have a common cup shape with a wide upper part and a narrow lower part. Therefore, even when continuously stacked and inserted, conventional disposable paper cups still have a volume burden caused by the original shape of the paper cups.

[0004] To solve this problem, Korean Patent No. 10-1114236 discloses a folding paper cup that can be used in an upright state. In Korean Patent No. 10-1114236, Figure 1 is a perspective view showing the folded state of a conventional folding paper cup, Figure 2 is a perspective view showing Figure 1 the inflated state of the folding paper cup of Figure 3 is a perspective view showing Figure 1 the enlarged bottom surface of the inflated folding paper cup of Figure 4 is Figure 1 the exploded perspective view of the inflated folding paper cup of Figure 5 is Figure 1 the development view of the folding paper cup of

[0005] As shown in the drawings, the folding paper cup includes a cup body 10 and a bottom sheet 20 made of paper coated with polyethylene on one of its surfaces. The cup body 10 has a coated inner surface, and the bottom sheet 20 has a coated outer surface. In addition, since the cup body 10 needs to maintain the inflated state as it is when expanding from the folded state, the cup body 10 is thicker than the bottom sheet 20, and the bottom sheet 20 is relatively thin and soft for easy folding and inflation.

[0006] The cup body 10 includes folding lines 11 and 11', which are folded to both sides relative to the central center line in a state where a rectangular piece of paper is cut. The folding lines 11 and 11' can be formed by a pressing action and can be formed in a dotted line shape. In addition, since the curved lines 12 and 12' with curvature are symmetrically formed in an elliptical shape on both sides of the folding lines 11 and 11', the recessed portions 13 and 13' formed by the folding lines 11, 11' and the curved lines 12 and 12' are formed on both sides. The bending points 14 and 14' formed at the bending portions at the upper and lower ends of the cup body 10 relative to the ends of the curved lines 12 and 12' are used to suppress and weaken the force that returns the upper and lower ends of the cup body 10 expanded into an elliptical shape to the folded state, and the bending points 14, 14' keep the expanded cup body 10 as it is.

[0007] The curved line 15 is formed on a horizontal line perpendicular to the recessed portions 13 and 13' relative to the folding lines 11 and 11'. When using a paper cup, the bending of the central portions of the recessed portions 13 and 13' of the curved surface by the curved line 15 is used to suppress the restoring force to return to the folded state. In addition, the bottom sheet 20 welded to the inner lower end of the cup body 10 is formed in such a way that it is cut into a rectangular shape and a central folding line 21 passing horizontally through the central portion and two curved lines 22 and 22' vertically formed on both sides are formed. In a state where the bottom sheet 20 is folded in half and folded along the central folding line 21 so that the coated surface is on the outside, the two side ends are joined to each other, and then folded as Figure 4 shown. The folded ends are inserted into the inner lower end of the cup body 10 and then heat-welded to the cup body 10 for attachment and fixation.

[0008] In this case, since the inner surface of the cup body 10 is coated with a coating and the outer surface of the bottom sheet 20 is coated with a coating, in a state where the inner surface of the cup body 10 and the outer surface of the bottom sheet 20 overlap each other and a jig is inserted into the bottom sheet 20, they are pressed into close contact with each other using heat or high frequency or ultrasonic waves. Then, the coatings (for example, polyethylene) are welded and joined to each other so that the cup body 10 and the bottom sheet 20 are attached to each other in a watertight state.

[0009] As described above, when the bottom sheet 20 is welded in the cup body 10, the paper cup becomes flat through the two folding lines 11 and 11' of the cup body 10 and the central folding line 21 of the bottom sheet 20. When the user presses the two folding lines 11 and 11' with fingers at the same time, the recessed portions 13 and 13' are formed by the curved lines 12 and 12', and the upper and lower ends of the cup body 10 expand. The central folding line 21 of the bottom sheet 20 at the inner lower end is unfolded by the expansion force of the cup body 10, and the two curved lines 22 and 22' are bent along the shape of the lower part of the cup body 10 to form a circular bottom.

[0010] Therefore, only the cup body 10 and the bottom sheet 20 located at the lower part of the cup body 10 are formed as monomers, and the cup body 10 and the bottom sheet 20 are folded together so as to be folded and inflated together so as to be unfolded, and the inflated state is stably maintained even in the inflated state. This structure can accommodate more contents than a simple folded paper cup because the bottom sheet widens horizontally when the paper cup is unfolded. However, conventional folded paper cups have several disadvantages, that is, they may cause water leakage when unfolded, and it is difficult to use the cup body in a standing state because the bottom of the cup body is lifted rather than horizontal when the lower end of the folding line is used as a recessed part.

[0011] To solve these disadvantages, a double welding method of welding two folding ends of the bottom sheet and welding the welded ends to the cup body again is disclosed in Korean Patent No. 10-1401814. However, the double welding method has the disadvantage that since the upper part of the cup body is not formed into a circle when unfolded, after the folded paper cup is unfolded, the return phenomenon of folding the unfolded part due to an external impact often occurs during use. Summary of the Invention

[0012] Technical Problem

[0013] Therefore, the present invention is made in view of the above problems occurring in the prior art, and an object of the present invention is to provide a disposable folded paper cup, in which two longitudinal ends of the bottom sheet are folded inward, the bottom sheet coatings are welded to each other, the welded bottom sheet coatings overlap at the inner lower part of the cup body in the folded state, the coating of the cup body and the coating of the bottom sheet are welded to each other, and both ends of the bottom sheet coating and the front and rear parts of the two ends are welded to have welding posts, and the folding line of the cup body is welded to the welding posts at three sides, thereby preventing water leakage at the boundary part between the cup body and the bottom sheet, and preventing shape deformation by strengthening the bearing capacity when unfolded.

[0014] Another object of the present invention is to provide a disposable folded paper cup, in which a bent welding line is located at the upper part of the bottom sheet, both ends of the bent welding line are located at the bending lines forming recessed parts, and the bottom welding bands are welded in a state where they are separated from each other up and down, thereby absorbing the initial impact by the impact absorption force caused by the bent welding line when unfolded, and maintaining the unfolded state for a long time by reducing the frictional force and restoring force at both ends of the bottom, because the bent welding line is not welded within the bending line when unfolded.

[0015] Another object of the present invention is to provide a disposable folding paper cup, in which the curved bottom is formed in such a way that the center of the bottom surface of the cup body is lifted, so that when the user presses the recessed part to make the folding paper cup stand on the floor, even if the folding line part is lifted, the bottom of the cup body in the unfolded state remains horizontal by the curved bottom. In addition, the minor axis of the recessed part is larger than the interval between the bending lines forming the recessed part to make the pressing depth deeper, so that the recessed part has a rectangular shape when unfolded, and the upper end of the cup body is formed in a circular shape, because the bending line is spaced apart from the top end of the cup body, thereby allowing the user to drink the content without allowing the content to flow out of the mouth at any position.

[0016] Still another object of the present invention is to provide a disposable folding paper cup having a gentle uneven part formed at the upper end of the cup body, thereby preventing the user's lips from being cut.

[0017] Another object of the present invention is to provide a disposable folding paper cup, in which welding posts are formed at both ends of the cup body and the bottom sheet, the bending lines forming the recessed part are formed in an elliptical shape, and the bending lines of the recessed part and the cup body are spaced apart from each other, so that the bottom of the recessed part forms an elliptical shape like a rugby ball, so as to strengthen the bearing force in the form of welding posts when the recessed part around the folding line of the cup body in the folded state is pressed, the recessed part is formed in a rectangular shape to improve the gripping performance, and the upper end of the recessed part is formed in a circular shape, thereby allowing the user to conveniently drink the content without leakage.

[0018] Technical solution

[0019] To achieve the above object, according to the present invention, there is provided a disposable folding paper cup, comprising: a cup body made of coated paper with a cup body coating on its inner surface, which forms a cylindrical shape when unfolded and forms a flat surface when its two sides are folded at the folding line; bending lines that form an elliptical recessed part, which unfolds symmetrically in a double manner around each of the folding lines when the height center part of the folding line of the cup body is pressed, and these bending lines divide the elliptical recessed part spaced apart from the upper and lower ends of the cup body; a bottom sheet, which is coated paper having a bottom sheet coating formed on its surface for welding with the cup body coating inside the lower end of the cup body, both ends of the bottom sheet are welded to each other once, and at the same time the bottom sheet is folded along the upwardly convex transverse center folding line, and the bottom sheet is welded to the bottom edge of the folded cup body to form a bottom welding band; and a welding post formed at the part where the bottom welding band and the folding line intersect, the welding post is formed in a columnar shape, that is, the end of the bottom sheet is higher than the welding height of the bottom welding band but lower than the lower end of the bending line in the state where the end of the bottom sheet is inserted between the front surface and the rear surface based on the folding line, so that the end of the bottom sheet is welded at three sides.

[0020] According to an embodiment of the present invention, the minor axis of the unfolded recess is greater than the interval between the bending line intersecting the center bending line of the minor axis and the bending line of the recess opposite to the bending line.

[0021] According to an embodiment of the present invention, auxiliary bending lines are attached to the upper and lower portions of the bending line.

[0022] According to an embodiment of the present invention, the bottom of the bottom sheet and the cup body respectively form a bottom welding band and a bending welding line, and the bending welding line bends downward from both ends of its upper portion to the center to be spaced apart from the bottom welding band. Both ends of the bending welding line correspond to the bending line, and auxiliary bending lines are attached to the recess between the bending line and the vertical line at the point where the bending welding line intersects the bending line.

[0023] According to an embodiment of the present invention, gentle uneven portions are formed at the upper end of the cup body to prevent the user's lips from being cut.

[0024] According to an embodiment of the present invention, the bottom sheet welded to the inner bottom of the cup body has a plurality of convex portions and concave portions continuously formed at the longitudinal center portion to reduce the frictional force on the inner bottom of the cup body, thereby facilitating insertion into the cup body and making the bottom sheet closely contact the inner wall of the cup body through the convex portions and concave portions pressed and stretched during welding.

[0025] Advantageous effects

[0026] As described above, the two longitudinal ends of the bottom sheet are folded inward, the bottom sheet coatings are welded to each other, the welded bottom sheet coatings overlap at the inner lower portion of the folded cup body, the coating of the cup body and the coating of the bottom sheet are welded to each other, and the two ends of the bottom sheet coating and the front and rear portions of the two ends are welded to have welding columns, and the folding lines of the cup body are welded to the welding columns at three sides, thereby preventing water leakage at the boundary portion between the cup body and the bottom sheet and preventing shape deformation by strengthening the bearing force during unfolding.

[0027] According to the present invention, the bending welding line is located at the upper portion of the bottom sheet, both ends of the bending welding line are located at the bending line forming the recess, and the bottom welding bands are welded in a state of being separated from each other up and down, thereby absorbing the initial impact by the impact absorption force caused by the bending welding line during unfolding, and maintaining the unfolded state for a long time by reducing the frictional force and storage force at both ends of the bottom, because the bending welding line is not welded within the bending line during unfolding.

[0028] According to the present invention, the curved bottom is formed in such a way that the center of the bottom surface of the cup body is lifted, so that when the user presses the recess to make the folded paper cup stand on the floor, even if the folding line part is lifted, the bottom of the cup body in the unfolded state remains horizontal by the curved bottom. In addition, the minor axis of the recess is larger than the interval between the bending lines forming the recess to make the pressing depth deeper, so that the recess has a rectangular shape when unfolded, and the upper end of the cup body is formed in a circular shape because the bending line is spaced apart from the top end of the cup body, thereby allowing the user to drink the content without the content flowing out of the mouth at any position.

[0029] According to the present invention, the disposable folded paper cup has a gentle uneven portion formed at the upper end of the cup body, thereby preventing the user's lips from being cut.

[0030] According to the present invention, welding posts are formed at both ends of the cup body and the bottom sheet, the bending line forming the recess is formed in an oval shape, and the bending lines of the recess and the cup body are spaced apart from each other, so that the bottom of the recess forms an oval shape like a rugby ball, so as to strengthen the bearing force in the form of welding posts when the recess around the folding line of the cup body in the folded state is pressed, the recess is formed in a rectangular shape to improve the grasping performance, and the upper end of the recess is formed in a circular shape, thereby allowing the user to conveniently drink the content without leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a perspective view of the folded state of a conventional folded paper cup.

[0032] Figure 2 is a view showing Figure 1 the inflated state of the folded paper cup.

[0033] Figure 3 is Figure 1 the bottom perspective view of the inflated state of the folded paper cup.

[0034] Figure 4 is Figure 1 the exploded perspective view of the folded paper cup.

[0035] Figure 5 is Figure 1 the unfolded view of the folded paper cup.

[0036] Figure 6 is a perspective view of the folded state of a conventional folded paper cup.

[0037] Figure 7 is a bottom perspective view showing the inflated state of the folded paper cup according to the present invention.

[0038] Figure 8 is the exploded perspective view of the folded paper cup according to the present invention before welding.

[0039] Figure 9 is the developed view of the folding paper cup according to the present invention.

[0040] Figure 10 is a perspective view showing the state where the paper is folded once to manufacture the bottom sheet of the present invention.

[0041] Figure 11 is a perspective view showing the state where the paper is folded and welded twice to manufacture the bottom sheet according to the present invention.

[0042] Figure 12 is a view showing the principle that the curved bottom of the cup body of the present invention is horizontal.

[0043] Figure 13 is a view showing that the recessed portion is not pressed to Figure 12 the enlarged view of the main part of the state of the A - A line.

[0044] Figure 14 is a view showing that the recessed portion is pressed to Figure 12 the enlarged view of the main part of the state of the B - B line.

[0045] Figure 15 is a front view showing a part of the present invention being cut. Detailed Description of the Invention

[0046] The present invention provides a disposable folding paper cup, comprising: a cup body made of coated paper with a cup body coating on its inner surface, which forms a cylindrical shape when unfolded and forms a flat surface when its two sides are folded at the folding lines; bending lines that form elliptical recessed portions, and these elliptical recessed portions expand symmetrically in a double - symmetry manner around each of the folding lines when the height center portion of the folding line of the cup body is pressed, and these bending lines divide the elliptical recessed portions spaced apart from the upper and lower ends of the cup body; a bottom sheet, which is coated paper with a bottom sheet coating formed on its surface for welding with the cup body coating inside the lower end of the cup body, and the two ends of the bottom sheet are welded to each other once while the bottom sheet is folded along the upward - convex transverse center folding line, and the bottom sheet is welded to the bottom edge of the folded cup body to form a bottom welding band; and welding columns formed at the part where the bottom welding band and the folding lines intersect, and the welding columns are formed in a columnar shape, that is, the bottom sheet is higher than the welding height of the bottom welding band but lower than the lower end of the bending lines in the state where the end of the bottom sheet is inserted between the front surface and the rear surface based on the folding line, so that the end of the bottom sheet is welded at three sides.

[0047] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to Figures 7 to 15 the accompanying drawings.

[0048] The cup body 10 is made of coated paper with a coated inner surface and is in a folded state. When the user presses two spaced-apart folding lines 11 and 11' to unfold the cup body 10 in the folded state, folding lines 12 and 12' are formed, and these folding lines 12 and 12' form oval recesses 13 and 13'. The recesses 13 and 13' are formed by bending lines 12a and 12'a and are folded upward to bulge by a center folding line 21 formed at the inner lower part of the cup body 10 in the horizontal direction. The bottom sheet 20 made of coated paper coated with a bottom sheet coating 20b is welded to the cup body 10 through the outer surface of the bottom sheet base layer 20a.

[0049] As Figure 12 and Figure 15 shown, a bent welding line 20c that bends downward from the bottom sheet 20 intersecting the bending lines 12a and 12'a is additionally welded.

[0050] Furthermore, the lower end portion of the bottom sheet 20 and the inner surface of the cup body 10 are additionally welded below the bent welding line 20c so as to be spaced apart from the bent welding line 20c, thereby forming a bottom welding band 20d. At the portion where the bottom welding band 20d intersects the folding lines 11 and 11', the end portion of the bottom sheet 20 is inserted between the front surface and the rear surface based on the folding lines 11 and 11'. The end portion of the bottom sheet 20 is welded in such a way that a welded column 20e with three sides is formed. The welded column 20e of the bottom sheet 20 has a cylindrical shape that is higher than the welding height of the bottom welding band 20d but lower than the lower ends of the bending lines 12a and 12'a.

[0051] As Figure 10 shown, two longitudinal end surfaces 25 and 25' formed by the center folding line 21 are folded inward to have a predetermined width. Thereafter, as Figure 11 shown, the bottom sheet coatings 20b coated on the two end surfaces 25 and 25' of the bottom sheet base layer 20a are welded to each other, thereby forming the bottom sheet 20.

[0052] The bottom sheet 20 welded to the inner bottom of the cup body 10 has a plurality of convex portions 20f and concave portions 20g continuously formed at its central portion to reduce the frictional force with the inner bottom of the cup body 10. Therefore, the bottom sheet 20 can be easily inserted into the cup body 10, and the inner wall of the cup body 10 and the bottom sheet 20 are welded in a contact state because the convex portions 20f and concave portions 20g of the bottom sheet 20 are pressed and straightened during welding.

[0053] Furthermore, since the bottom sheet coating 20b is exposed on the surface of the bottom sheet 20, the bottom sheet coating 20b and the cup coating 10b of the inner surface of the cup body 10 are welded in such a way that, according to Figure 13 the principle, a bent welding line 20c is formed at the upper part, a bottom welding band 20d is formed at the lower part, and both ends are formed as shown in Figure 15The welded post 20e shown. Thus, the disposable folding paper cup according to the present invention ensures sealing through the bottom welding strip 20d and the welded post 20e at the lower part, and shows a shape retention function and a shock absorption function by bending the welding line 20c when unfolded, so that even after unfolding, it is stably held in the unfolded state due to the bearing capacity of the welded post.

[0054] The part near the folding lines 11 is not welded to the cup body 10 to be as high as the negative film 20 in the folded state, but is divided into a bent welding line 20c and a bottom welding strip 20d to be welded at the upper and lower parts. The bent welding line 20c is welded in a linear shape, and the bottom welding strip 20d is spaced downward and welded in a strip shape. Therefore, due to the weakened bearing capacity, the paper cup is easily unfolded when the recessed parts 13 are pressed, and can be held in the unfolded state because the welded post 20e supports with a strong bearing capacity.

[0055] The bottom of the cup body 10 between the folding lines 11 and 11' is cut to form a bent bottom 17, which bends upward from the lower ends corresponding to the folding lines 11 and 11' towards the center between the folding lines 11 and 11'. When Figure 9 the cutting line (c) shown is cut after being welded to the negative film 20, the bent bottom 17 is formed. The reason is that when the recessed parts 13 and 13' near the folding lines 11 and 11' are pressed, the folding lines 11 and 11' are lifted, making the bent bottom 17 a horizontal surface.

[0056] That is, in the folded state, the height of the bent bottom 17 between the folding lines 11 and 11' is the same as the height of the lifted lower ends of the folding lines 11 and 11' in the unfolded state (represented by Figure 12 the solid line).

[0057] Figure 9 The negative film 20 shown is folded based on the center folding line 21, so that the negative film coating 20b becomes the surface, and the two end surfaces 25 and 25' are folded to the two ends of the center folding line 21, and Figure 11 and Figure 13 the outer negative film coatings 20b shown are welded to each other in the state where the two end surfaces 24 and 25'a are folded, thus completing the negative film. In addition, a plurality of convex parts 20f and concave parts 20g are continuously formed at the center of the negative film 20 in the width direction, so that the length of the negative film 20 is forcibly reduced. Therefore, the negative film 20 can be easily inserted into the cup body 10.

[0058] As Figure 9 shown, the coated paper is cut in the longitudinal direction, and is stamped through the folding lines 11 and 11' and the bending lines 12a and 12'a to form a recessed part 13 in a grooved shape. The center is folded so that the edge parts overlap, and then the two ends are welded, thus forming the cup body 10 in a folded form.

[0059] As Figure 11 shown, the negative film is folded and the edges are welded, and the center folding line 21 of the negative film 20 having a plurality of convex portions 20f and concave portions 20g at the center is located above. Thereafter, in Figure 8 this state, the negative film is located between the cup bodies 10, and the negative film 20 having the convex portions 20f and the concave portions 20g is set to the inner bottom of the cup bodies 10 so as to be easily overlapped and frictionless at both ends. When the negative film and the cup bodies are welded by high frequency, the convex portions 20f and the concave portions 20g are pressed flat, and the end portions of the negative film 20 are in close contact with the folding lines 11 and 11' of the cup bodies 10 so as to be welded.

[0060] As Figure 12 and Figure 15 shown, the inner surface of the cup body 10 and the surface of the negative film 20 are further welded in the form of a curved welding line 20c so as to bend downward between the folding lines 11 and 11'. In addition, a bottom welding band 20d is formed below the curved welding line 20c so as to be spaced apart from the curved welding line 20. At the portion where the bottom welding band 20d intersects the folding lines 11 and 11', the end portions of the negative film 20 are inserted between the front surface and the rear surface based on the folding lines 11, 11'. The end portions of the negative film 20 are welded in such a manner that a welded column 20e having three sides is formed. The welded column 20e of the negative film 20 has a columnar shape, which is higher than the welding height of the bottom welding band 20d but lower than the lower ends of the bending lines 12a and 12'a. For example, the welding can be high-frequency welding or ultrasonic welding, but the present invention is not limited thereto.

[0061] As Figure 6 , Figure 12 and Figure 15 shown, the negative film 20 welded to the cup body 10 is welded to form a curved welding line 20c, a bottom welding band 20d and a welded column 20e, and the bottom surface of the bottom welding band 20d is cut to form a curved bottom 17.

[0062] In the case of using the disposable folding paper cup manufactured as described above, when the user presses the center bending line 15 in the folded state as Figure 15 shown, the recessed portion 13 is recessed inward from the cup body 10, and the formed cup shape as Figure 7 shown is maintained, so that the user can use the folding paper cup like an ordinary cup.

[0063] That is, in the folded state, the bottom of the cup body 10 is formed as Figure 12a bent bottom 17 as in the dashed-line state. However, when the user presses the recessed portions 13 and 13', the center bending lines 15 and the auxiliary bending lines 15-1 and 15-2 are bent into recesses. Accordingly, the upper part of the cup body 10 is widened to form a circle similar to a normal cup. In this case, since the lower ends of the folding lines 11 and 11' of the cup body 10 are lifted from the dashed-line state to the solid-line state, the widened bottom becomes flat, so that the user can use the folding paper cup in a state where the cup stands on the floor like a normal cup.

[0064] In this case, since the lower ends of the folding lines 11 and 11' of the cup body 10 are welded to the bottom sheet 20 on three sides (front side, rear side, and lateral side), the welding posts 20e firmly support the bottom of the cup body 10 like columns to prevent deformation.

[0065] In addition, as Figure 10 and Figure 11 shown, in order to manufacture the paper cup, the two end surfaces 25 and 25' are folded inward, and the bottom sheet coatings 20b are welded to each other. Then, the cup body coating 10b and the bottom sheet coating 20b on the outer surface of the bottom sheet 20 are integrally welded at three sides inside the cup body 10 (welded so that the upper and lower parts are spaced apart from each other, so that the bending lines 12a and 12'a are formed at the upper part, and the bottom welding band 20d is formed at the lower part). As Figure 13 and Figure 14 shown, in the case where the recessed portion 13 is pressed, the two end surfaces 25 are simultaneously welded to the folding lines 11 and 11' of the cup body 10 and three sides of the front and rear surfaces to form the welding posts 20e. The bottom surfaces 25 and 25' welded at the edge portions of the bottom sheet 20 that are not fused to the welding posts 20e remain unfolded because they are not welded to the cup body 10, as Figure 14 shown, and do not absorb the anti-unfolding force, and there is no water leakage at the edge of the bottom sheet 20, so that the folding paper cup can be used like a normal cup.

[0066] In addition, since the minor axis C1 of the bending lines 12a and 12'a that divide the recessed portion 13 is greater than the interval B1 between the bending lines, the bending line portion of the cup body 10 forms a bending angle and a bending depth in the form of an approximately square shape on a plane. Accordingly, the auxiliary bending lines 12a-1 and 12'a-1 are provided to prevent the bending lines 12a and 12'a from being restored or torn when suddenly pressed. Since the auxiliary bending lines 12a-1 and 12'a-1 are provided to prevent the bending lines 12a and 12'a from being restored or torn, only the pressing force applied to the bending lines 12a and 12a' is dispersed, thereby enhancing the shape retention force, and doubling the dispersion and absorption of the applied restoring force when the folding paper cup is filled with contents. The auxiliary bending lines 12a-1 and 12'a-1 are located between the vertical lines at both ends of the bending welding line 20c to support the internally applied pressure vertically.

[0067] As Figure 15 shown, instead of a sharp and flat blade shape, a concavo-convex portion 19 is formed at the edge of the upper end of the cup body 10. Since the concavo-convex portion does not have a blade portion, it is possible to prevent the user's lips from being cut. In addition, even when the user drinks hot water, the concavo-convex portion 19 also prevents the user's lips from being scalded because the contact area between the content and the user's lips is reduced.

[0068] Industrial Applicability

[0069] The disposable folding paper cup according to the present invention can be widely used in vending machines, offices, homes or outdoors, and allows the user to easily store and use.

Claims

1. A disposable folding paper cup, comprising: A cup body (10) made of coated paper with a cup body coating (10b) coated on its inner surface, which forms a cylindrical shape when unfolded and forms a flat surface when its two sides are folded at the folding lines (11, 11'); Bending lines (12a, 12'a) that form oval recesses (13, 13'), and the oval recesses (13, 13') are symmetrically unfolded around each of the folding lines (11, 11') on both sides when the height center part of the folding lines (11, 11') of the cup body (10) is pressed, and the bending lines (12a, 12'a) divide the oval recesses (13, 13') spaced apart from the upper and lower ends of the cup body (10); A bottom sheet (20), which is coated paper with a bottom sheet coating (20b) formed on its surface for welding with the cup body coating (10b) inside the lower end of the cup body (10). The two ends of the bottom sheet (20) are welded to each other once, and at the same time, the bottom sheet is folded along the upwardly convex transverse center folding line (21), and the bottom sheet (20) is welded to the bottom edge of the folded cup body (10) to form a bottom welding band (20d); And Welding columns (20e) formed at the intersection of the bottom welding band (20d) and the folding lines (11, 11'). The welding columns (20e) are formed in a columnar form. In a state where the ends of the bottom sheet (20) are inserted between the front surface and the rear surface based on the folding lines (11, 11'), the bottom sheet (20) is higher than the welding height of the bottom welding band (20d) but lower than the lower ends of the bending lines (12a, 12'a), so that the ends of the bottom sheet (20) are welded at three sides.

2. The disposable folding paper cup according to claim 1, wherein, The length of the minor axis (C1) of the ellipse corresponding to the unfolded recesses (13, 13') is greater than the length of the interval (B1) between the bending line (12a) intersecting the center bending line (15) of the minor axis (C1) and the bending line (12'a) of the recess (13') opposite to the bending line (12a).

3. The disposable folding paper cup according to claim 2, wherein, Auxiliary bending lines (15-1, 15-2) are added to the upper and lower parts of the center bending line (15).

4. The disposable folding paper cup according to claim 1, wherein, The bottom of the bottom sheet (20) and the cup body (10) respectively form a bottom welding band (20d) and a bending welding line (20c). The bending welding line (20c) bends downward from both ends of its upper part to the center to be spaced apart from the bottom welding band (20d), and wherein, the two ends of the bending welding line (20c) correspond to the bending lines (12a, 12'a), and auxiliary bending lines (12a-1, 12'a-1) are added to the recesses (13, 13') between the bending lines (12a, 12'a) and the vertical lines at the intersection points of the bending welding line (20c) and the bending lines (12a, 12'a).

5. The disposable folding paper cup according to claim 1, wherein, A smooth concavo-convex portion (19) is formed at the upper end of the cup body (10) to prevent the user's lips from being cut.

6. The disposable folding paper cup according to claim 1, wherein, The bottom sheet (20) welded to the inner bottom of the cup body (10) has a plurality of convex portions (20f) and concave portions (20g) continuously formed at the longitudinal central portion to reduce the frictional force on the inner bottom of the cup body (10), thereby facilitating insertion into the cup body (10) and enabling the bottom sheet (20) to be in close contact with the inner wall of the cup body (10) through the convex and concave portions pressed and stretched during melting.

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