Paper tube with concave bottom and its manufacturing mold

Abstract

The invention discloses a paper tube with a concave bottom, which has a cylinder body and a concave bottom. The paper of the concave bottom is deformed and folded in a rotation direction. After the concave bottom is unfolded, it becomes a part of the original cylinder body, and there is no adhesive on the unfolded surface. The manufacturing mold of the paper tube with a concave bottom comprises an inner mold, an outer mold 1 and an outer mold 2. The inner mold is a cylinder, and one end face of the cylinder has an inner hole; the outer mold 1 has an inner hole, and at least two forming blocks are arranged on the inner hole wall; the outer mold 2 has an inner hole, and a boss is arranged at the center of the bottom face of the inner hole. The end face of the boss is a plane or a spherical surface. There are at least two auxiliary forming blocks between the side face of the boss and the inner peripheral face of the inner hole. The auxiliary forming blocks have a front auxiliary face and a rear auxiliary face, and the intersection line of the front auxiliary face and the rear auxiliary face is an auxiliary forming edge. The advantages of the invention are that the paper tube with a concave bottom is integrally formed, and no adhesive is required, which saves energy and time for drying.

Description

Technical Field

[0001] The invention relates to a paper product and a manufacturing mold thereof, in particular to a paper tube with a concave bottom and a manufacturing mold thereof. Background Art

[0002] In daily life and production, paper tubes with bottoms are needed in many places. These paper tubes with bottoms are assembled from two separate parts: a tube body and a tube bottom. First, a tube body with two openings at both ends is manufactured, one end of the tube body is rolled into the tube body, and then a round paper piece is punched out. The round paper piece is coated with adhesive around the edges and pressed into the tube body, and then the adhesive is dried. This method is time-consuming and labor-intensive, with low production efficiency and high cost. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a paper tube with a concave bottom having a simple structure and high production efficiency and a manufacturing mold thereof.

[0004] The present invention adopts the following technical scheme.

[0005] A paper tube with a concave bottom comprises a tube body and a concave bottom, wherein the concave bottom is concave into the tube body, the bottom surface of the concave bottom is a plane or a spherical surface, the paper of the concave bottom is deformed and folded in a rotation direction, and the concave bottom becomes a part of the original tube body after being unfolded.

[0006] The manufacturing mold of a paper tube with a concave bottom comprises an inner mold, an outer mold 1 and an outer mold 2, wherein the inner mold is a cylinder, an end face of the cylinder has an inner hole, and the bottom face of the inner hole is a plane or a spherical surface; the outer mold 1 has an inner hole, and at least two forming blocks are arranged on the inner hole wall, and the forming blocks have a front, a forming surface and a rear face, and each forming surface is located on an inner conical surface coaxial with the inner hole, and an edge of the front side coincides with an edge of the forming surface, and an edge of the rear side coincides with another edge of the forming surface, and the other edges of the front side and the rear side are on the inner hole wall; the outer mold 2 has an inner hole, and a boss is arranged at the center of the bottom face of the inner hole, and the end face of the boss is a plane or a spherical surface, and at least two auxiliary forming blocks are arranged between the side face of the boss and the inner peripheral face of the inner hole, and the auxiliary forming blocks have a front auxiliary face and a rear auxiliary face, and the intersection line of the front auxiliary face and the rear auxiliary face is an auxiliary forming edge.

[0007] The surface of the recessed bottom after being unfolded has no adhesive.

[0008] The boss end surface of the outer mold 2 has at least one groove.

[0009] The auxiliary forming edge of the outer mold 2 is an arc.

[0010] Compared with the prior art, the invention has the advantages that the paper tube with the concave bottom is integrally formed and does not require adhesive, thus saving energy and time for drying, greatly improving the quality and quantity of the product and reducing the labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of a paper tube with a concave bottom according to Example 1 of the present invention.

[0012] Figure 2 This is a schematic diagram of the structure of the inner mold of Example 1 of the present invention.

[0013] Figure 3 This is a schematic structural diagram of the outer mold 1 of Example 1 of the present invention.

[0014] Figure 4 for Figure 3 AA section view of the structure.

[0015] Figure 5 Schematic diagram of the structure of the outer mold 2 of Example 1 of the present invention.

[0016] Figure 6 for Figure 5 BB cross-section view.

[0017] Figure 7 for Figure 5 Cross-sectional view of CC rotated and unfolded.

[0018] Figure 8 This is a schematic diagram of the structure of a paper tube with a concave bottom according to Example 2 of the present invention.

[0019] Fig. 9 This is a schematic diagram of the structure of the inner mold of Example 2 of the present invention.

[0020] Fig.10 Schematic diagram of the structure of the outer mold 2 of embodiment 2 of the present invention.

[0021] Fig.11 for Fig.10 DD section view.

[0022] Fig.12 for Fig.10 EE rotated and unfolded cross-section. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] Embodiment 1, as Figure 1-7 As shown, a paper tube with a concave bottom has a tube body 13 and a concave bottom 12. The concave bottom 12 is concave into the tube body 13, and the bottom surface of the concave bottom is a spherical surface. The paper of the concave bottom 12 is deformed and folded in a rotation direction. When the concave bottom 12 is unfolded, it becomes a part of the original tube body 13. There is no adhesive on the surface of the concave bottom 12 after it is unfolded.

[0025] The manufacturing mold of the paper tube with a concave bottom comprises an inner mold, an outer mold 1 and an outer mold 2. The inner mold is a cylinder 15, one end surface of the cylinder 15 has an inner hole 14, the bottom surface of the inner hole 14 is a spherical surface, and the circumferential surface of the cylinder 15 has a flange 16.

[0026] The outer mold 1 has an inner hole 5, and there are 4 molding blocks on the wall of the inner hole 5. The molding blocks have a front face 1, a molding surface 3 and a rear face 4. Each molding surface 3 is located on an inner conical surface coaxial with the inner hole 5. One edge of the front face 1 coincides with one edge of the molding surface 3, and one edge of the rear face 4 coincides with another edge of the molding surface 3. The other edges of the front face 1 and the rear face 4 are on the wall of the inner hole 5, and there is a center hole 2 at the top of the inner conical surface.

[0027] The outer mold 2 has an inner hole 8, and a boss 7 is provided at the center of the bottom surface of the inner hole 8. The end surface of the boss 7 is a spherical surface, and the end surface of the boss 7 has two grooves 6. There are three auxiliary molding blocks between the side surface of the boss 7 and the inner circumferential surface of the inner hole 8. The auxiliary molding blocks have a front auxiliary surface 9 and a rear auxiliary surface 10. The intersection line of the front auxiliary surface 9 and the rear auxiliary surface 10 is an auxiliary molding edge 11, and the auxiliary molding edge 11 is an arc.

[0028] The manufacturing process of the paper tube with a concave bottom is as follows: first, insert one end of the inner mold with an inner hole 14 into the paper tube with two ends opened, and one end of the paper tube extends out of the inner mold with an inner hole 14. The outer mold 1 is connected to a rotating mechanism, and the rotating mechanism is connected to a reciprocating mechanism. The outer mold 1 rotates and extrude one end of the paper tube into a cone. The outer mold 2 is connected to another rotating mechanism, and this rotating mechanism is connected to the reciprocating mechanism. The outer mold 2 then rotates and extrude the conical end of the paper tube into a concave bottom. Since the end surface of the boss 7 of the outer mold 2 has two grooves 6, the conical end of the paper tube can be quickly rotated and extruded into a concave bottom, and the extrusion is very tight, and no adhesive is required at all.

[0029] Embodiment 2, as Figure 8-12 As shown, a paper tube with a concave bottom has a tube body 213 and a concave bottom 212. The concave bottom 212 is concave into the tube body 213, and the bottom surface of the concave bottom is a plane. The paper of the concave bottom 212 is deformed and folded in a rotation direction. When the concave bottom 212 is unfolded, it becomes a part of the original tube body 213. There is no adhesive on the surface of the concave bottom 212 after it is unfolded.

[0030] The manufacturing mold of the paper tube with a concave bottom comprises an inner mold, an outer mold 1 and an outer mold 2. The inner mold is a cylinder 215, one end face of the cylinder 215 has an inner hole 214, the bottom face of the inner hole 214 is a plane, and the circumferential surface of the cylinder 215 has a flange 216.

[0031] The outer mold 1 is the same as the outer mold 1 of Example 1.

[0032] The outer mold 2 has an inner hole 208, and a boss 207 is provided at the center of the bottom surface of the inner hole 208. The end surface of the boss 207 is a plane, and the end surface of the boss 207 has two grooves 206. There are three auxiliary molding blocks between the side surface of the boss 207 and the inner circumferential surface of the inner hole 208. The auxiliary molding blocks have a front auxiliary surface 209 and a rear auxiliary surface 210. The intersection of the front auxiliary surface 209 and the rear auxiliary surface 210 is an auxiliary molding edge 211, and the auxiliary molding edge 211 is an arc.

Claims

1. A manufacturing mold for a paper tube with a concave bottom, comprising an inner mold, an outer mold 1 and an outer mold 2, the inner mold being a cylinder, an end face of the cylinder having an inner hole, the bottom face of the inner hole being a spherical surface, and a flange being provided on the circumferential surface of the cylinder; the outer mold 1 having an inner hole, and four forming blocks being provided on the inner hole wall, the forming blocks having a front face, a forming surface and a rear face, each forming surface being located on an inner conical surface coaxial with the inner hole, an edge of the front face coincides with an edge of the forming surface, an edge of the rear face coincides with another edge of the forming surface, the other edges of the front face and the rear face are on the inner hole wall, and a center hole is provided on the top of the inner conical surface; the outer mold 2 having an inner hole, and a boss being provided at the center of the bottom face of the inner hole, the end face of the boss being a spherical surface, and three auxiliary forming blocks being provided between the side face of the boss and the inner circumferential surface of the inner hole, the auxiliary forming blocks having a front auxiliary face and a rear auxiliary face, and the intersection line of the front auxiliary face and the rear auxiliary face being an auxiliary forming edge, characterized in that The end surface of the boss has two grooves.

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