CN111196055B

CN111196055B - Paper cover

Info

Publication number: CN111196055B
Application number: CN201910219686.6A
Authority: CN
Inventors: 山田菊夫
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-16
Filing date: 2019-01-31
Publication date: 2024-01-30
Anticipated expiration: 2039-01-31
Also published as: CN111196056A; CN111196055A; CN111196056B

Abstract

The invention aims to provide a paper cover with good use convenience. The paper cover is provided with: a main body part having a paper material; and a tapered portion having a taper opposite to the taper so as to be fitted to a container having an opening portion and a taper.

Description

Paper cover

The present invention is a divisional application of the invention application having the application date of 2019, 01, 31, 201910100479.9 and the name of "paper cover and method for manufacturing paper cover".

Technical Field

The present invention relates to a paper cover and a method for manufacturing the paper cover, and relates to a paper cover suitable for a liquid container and a method for manufacturing the paper cover.

Background

Paper cups are used as containers for various beverages such as coffee and black tea. The lid is covered so that the liquid of the contents does not leak from the paper cup. Most of the caps are made of plastic, which is not consistent with the recent trend of reducing plastic and using environmental protection products. In addition, although the use of the bottom portion of the paper cup as the paper lid has been proposed, the convenience of use has not been considered (patent document 1).

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2006-248530

Disclosure of Invention

Problems to be solved by the invention

In patent document 1, the taper of the paper cup and the taper of the lid are forward taper, and when the paper cup is inclined, the content may leak, and the convenience of use is insufficient. In addition, patent document 1 has only been proposed for paper lids, and has not been studied in detail, and the usability is not sufficient.

The present invention has been made in view of the above-described points, and an object thereof is to provide a paper cover with excellent usability.

Technical proposal

In order to solve the above-described problem, a 1 st aspect of the present invention provides a paper cover comprising: a cover main body part with paper material, which is assembled on a container with an opening part, a cone shape and a curled part; a first engagement portion provided in the cover main body portion, having a taper shape oriented in the same direction as the taper shape, and engaged with the curl portion from the outside of the curl portion; and a main body portion-side curled portion provided on the cover main body portion and located above the first engagement portion.

The 2 nd aspect of the present invention provides a method for manufacturing a paper cover, comprising: providing a drinking spout in a top cover part made of paper material, and a sealing part joined to the top cover part and the drinking spout; and a step of joining the cap portion formed with the drinking spout and the sealing portion to a tapered portion having a tapered shape and using a paper material.

A 3 rd aspect of the present invention provides a method for manufacturing a paper lid to be mounted on a container having an opening, a taper shape, and a curl portion, comprising: a step of forming an engagement portion for engaging the curled portion by deforming the curled portion by using a fan-shaped paper material; and a step of joining the top cover portion to the engagement portion.

Advantageous effects

In the paper cover according to claim 1, the sealing property of the paper cover is improved, and the usability of the paper cover can be improved.

In the method for manufacturing a paper cap according to claim 2, since the top cover portion formed with the drinking spout portion and the sealing portion is joined to the tapered portion having a tapered shape and using a paper material, a paper cap with excellent usability can be manufactured.

In the method for manufacturing a paper cover according to claim 3, since the top cover portion is joined to the engaging portion, a paper cover having improved sealing properties and excellent usability can be manufactured.

Drawings

Fig. 1 is a cross-sectional view of a paper cover and a container of a first embodiment.

Fig. 2 is a schematic view of a paper cover according to the first embodiment.

Fig. 3 is a reference diagram showing a plastic cover.

Fig. 4 is a cross-sectional view of a paper cover and a container of the second embodiment.

Fig. 5 is a schematic view of a paper cover with a holder according to a third embodiment.

Fig. 6 is a schematic view of a paper cover with a holder according to a fourth embodiment.

Fig. 7 shows an example in which a handle and a bracket are provided in a paper cover.

Fig. 8 is a schematic view of a paper cover of a fifth embodiment.

Fig. 9 is a schematic view of a paper cover of a sixth embodiment.

Fig. 10 is a diagram showing a method for manufacturing a paper cover according to the sixth embodiment.

Fig. 11 is a diagram showing a method for manufacturing a paper cover according to the sixth embodiment.

Fig. 12 is a diagram showing another method of manufacturing a paper cover.

Fig. 13 is a diagram showing an example of fitting of the curled portion.

Fig. 14 is a cross-sectional view showing a modified example of the seal portion.

Fig. 15 is a cross-sectional view showing a modified example of the seal portion.

Fig. 16 is a schematic view of a paper cover according to the seventh embodiment.

Fig. 17 is a cross-sectional view of a paper cover of the seventh embodiment.

Fig. 18 is a diagram showing an example of engagement between the top cover portion and the engaging portion.

Fig. 19 is a modified example of the paper cover of the sixth embodiment.

Fig. 20 is an enlarged cross-sectional view of a window portion of the seventh embodiment.

Fig. 21 is a modified example of a window portion of a paper cover of the seventh embodiment.

Fig. 22 is a cross-sectional view of a paper cover of an eighth embodiment.

Fig. 23 is a cross-sectional view showing a sealing portion of a paper cover according to an eighth embodiment.

Fig. 24 is a schematic view and a cross-sectional view showing an example of the engagement portion in fig. 22 (f).

Fig. 25 is a schematic view, a partial enlarged view, and A-A cross-sectional view showing the display portion 40 of the paper cover 1.

Fig. 26 is an expanded view of the paper cover 1 with the top cover part 2 removed.

Fig. 27 is a cross-sectional view of a paper cover of an eighth embodiment.

Fig. 28 is a flowchart showing an example of a method of manufacturing a paper cover.

Fig. 29 is a schematic view of a method for manufacturing a paper cover.

Fig. 30 is a view showing a method of drawing the top cover part from the blank roll.

Symbol description

1. Cover unit

2. Top cover part

3. Taper part

5. Drinking mouth

6. Groove part

8. Sealing part

9. Crimping part

10. Marking

20. Container

21. Taper part

22. Crimping part

30. Support frame

31. Hinge

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to fig. 1 to 30. In the embodiment, the same reference numerals are given to the components having the same functions, and the repetitive description thereof will be omitted or simplified.

(first embodiment)

Fig. 1 is a cross-sectional view of a paper cover 1 and a container 20 according to a first embodiment, fig. 1 (a) is a cross-sectional view showing a state in which the paper cover 1 is removed from the container 20, and fig. 1 (b) is a cross-sectional view showing a state in which the paper cover 1 is fitted into the container 20.

Fig. 2 is a schematic view of the paper lid 1 according to the first embodiment as seen from above, in which fig. 2 (a) is a view showing a state in which the sealing portion 8 seals the drinking port 5, and fig. 2 (b) is a view showing a state in which the sealing portion 8 is separated from the drinking port 5. Fig. 2 (c) and 2 (d) are diagrams each formed by bending the drinking opening 5 toward the center of the paper lid 1, and the solid line is a notch.

(paper cover)

The paper cover 1 has: a top cover part 2, a cone part 3 formed on the top cover part 2, a bottom cover part 4, a drinking opening 5, a groove part 6, an air hole part 7 and a sealing part 8.

The paper cap 1 is inserted into the inside of the container 20, and a paper material is used. The paper material is not particularly limited as long as it contains at least a cellulose component. In addition, paper materials formed by papermaking may also be used.

As the paper material, various water-resistant papers may be used, or a coating layer may be provided at least on the container side surface of the paper material. As the coating layer, a film or a coating agent can be used. The film may be: polyvinyl chloride, polyvinyl alcohol, polyurethane, acrylonitrile butadiene styrene copolymer, polyethylene terephthalate, cellophane, polypropylene, nylon, polyethylene, polyvinylidene chloride, polymethylpentene, ethylene-vinyl alcohol copolymer, and the like. It is preferable that the film be: a biodegradable film such as polylactic acid is used.

In the case of using the coating agent, a coating agent which does not affect the human body, such as vegetable starch, may be used. In the present embodiment, the bottom portion of the paper cup can be used as the paper lid 1.

The top cover 2 has a step (recess) of about 3 to 12mm in depth formed downward (on the container 20 side), and a tapered portion 3 formed on a side surface. The tapered portion 3 is tapered (inverted tapered) opposite to a tapered portion 21 of the outer shape of the container 20 described later, and is formed in a tapered shape expanding toward the container 20. The dimension in the height direction (Z direction in fig. 1) of the tapered portion 3 is larger than the dimension in the height direction of the curled portion 22 of the container 20 described later. Thus, when the paper cap 1 is inserted into the container 20, the risk of spillage of the contents of the container 20 can be reduced even if the container 20 is set down.

In the case where the tapered portion 3 and the tapered portion 21 are in the reverse tapered shape, the fitting force is a point contact (line contact) and not a surface contact, and therefore, the force during fitting acts intensively on the fitting portion as compared with the case of the surface contact. Therefore, the fitting between the tapered portion 3 and the tapered portion 21 is improved, and the sealing performance of the paper cover 1 is improved. Since the tapered portions 3 and 21 are made of paper, the tapered portions 3 and 21 are deformed by fitting to form a plurality of flat portions. The flat portion improves the fitting of the taper portion 3 and the taper portion 21. The above-described effects can be obtained even if the tapered portion 3 is formed in a straight line shape without a taper. That is, the inclination of the tapered portion 3 may be different from the inclination of the tapered portion 21.

In order to improve the sealing property of the paper cover 1, the tapered portion 3 may be provided with a concave-convex portion or a stepped portion.

The bottom cover 4 is engaged with the top cover 2. The engagement between the bottom cover portion 4 and the top cover portion 2 can be as follows: various methods such as press working, ultrasonic bonding, heat sealing, and adhesives (e.g., starch paste).

The drinking opening 5 is an opening provided in the top cover portion 2 and the bottom cover portion 4, and may be appropriately set in size and shape as a drinking opening or as a hole into which a straw is inserted. In addition, a half cut line may be added to facilitate user disassembly of the half cut.

As shown in fig. 2 (c) and 2 (d), the drinking spout 5 has a solid line incision and a part where the incision is not formed, and the part where the incision is not formed functions as a hinge. The drinking opening 5 is opened by bending the solid line slit toward the center of the paper cap 1. In this case, a notch is provided in the top cover portion 2, and the bottom cover portion 4 is provided as an opening corresponding to the notch, whereby the drinking opening 5 can be easily folded. If the cut line is cut from the top cover portion 2 side to the bottom cover portion 4 side to form a V shape (inverted triangle shape), the content from the container 20 is less likely to leak to the top cover portion 2 side in a state where the drinking port 5 is closed. The shape of the drinking opening 5 may be a straight shape, a curved shape, or a shape of a straight shape plus a curved shape, or may be a shape in which a knob portion is formed, as shown in fig. 2 (d).

Further, if the curled portion 9 is expanded to the outside in correspondence with the drinking port 5 as shown in fig. 2 (c), or if the outer periphery of the curled portion 9 is crushed to the inside as shown in fig. 2 (d), the content from the drinking port 5 is easily drunk. Instead of the outer ring of the curled portion 9 in fig. 2 (d), the inner ring may be crushed to the outside. As shown in the partial enlarged view of fig. 2 (d), a connecting portion 5a where no notch is formed may be provided in a part of the solid line notch portion of the drinking spout 5. If the connecting portion 5a is present, it is considered that the drinking spout 5 is not opened. In contrast, if the connecting portion 5a is not present, the drinking spout 5 is considered to be unsealed. In association with this, the connection portion 5a can recognize whether the drinking port 5 is miscreated. The positions and the number of the connecting portions 5a may be arbitrarily set. The connection portion 5a may be formed in the drinking port 5 of fig. 2 (a) to 2 (c).

As shown in fig. 2 (a) and 2 (b), the groove 6 is a rib provided in the top cover portion 2 by, for example, press working, and does not penetrate the top cover portion 2. In the present embodiment, the groove 6 is provided in plural numbers and is connected to the drinking port 5. When the content of the container 20 is stored in the recess (step portion) of the top cover portion 2 from the drinking port 5, the groove portion 6 guides the content stored in the recess of the top cover portion 2 to the drinking port 5, and then returns the content to the container 20.

Further, by providing the groove portion 6 by press working, the strength of the top cover portion 2 and the paper cover 1 can be improved.

As shown in fig. 2 (c) and 2 (d), the groove 6 may be provided from the drinking port 5 to the curl portion 9. The groove 6 may be formed to reach the edge or may be formed to reach the front of the edge. The groove 6 shown in fig. 2 (c) and 2 (d) guides the content from the drinking port 5 to the mouth of the user, and can return the content remaining in the vicinity of the drinking port 5 to the drinking port 5 when the user releases the mouth from the drinking port 5. In fig. 2 (c) and 2 (d), 3 grooves 6 are shown, but the number thereof may be any number, or may be omitted.

A label indicating the content may be attached or printed on the top cover part 2, or a label indicating the face of a person or animal may be attached or printed. In this case, if the drinking opening 5 is made to correspond to the mouth of a person or the mouth of an animal, the user can enjoy the same play as when eating the contents. Further, a half of the face may be printed on the taper portion 3, and the remaining portion of the face may be printed on the taper portion 21 of the container 20, so that the printed face may be visually confirmed when the paper cover 1 is properly attached.

Fig. 25 is a schematic view, a partial enlarged view, and A-A cross-sectional view showing the display portion 40 of the paper cover 1. In the partial enlarged view, the inner side and the outer side of the peripheral wall of the paper cover 1 are shown in a state of being expanded for the sake of easy understanding.

The display unit 40 is a member for recognizing the contents of the container 20 by printing characters, marks, patterns, figures, and the like. As described above, the paper cover 1 uses a paper material, and thus printing can be easily performed. The display unit 40 may recognize whether the content is hot or cold by printing with a background color. For example, a hot beverage may be identified by setting the background color to a red color, and a cold beverage may be identified by setting the background color to a water color. In addition, the content can also be visualized by the background color. For example, the background color may be black in the case of black coffee, orange in the case of orange juice, and white in the case of milk. Note that, when the background color is a black color, characters, marks, patterns, figures, and the like may be white.

As shown in the partial enlarged view, the display unit 40 includes: an outer display 40a printed so as to correspond to the outer side of the peripheral wall of the paper cover 1; a curl display portion 40b printed so as to correspond to the curl portion 9; and an inside display portion 40c printed so as to correspond to the inside of the peripheral wall of the paper cover 1. The peripheral wall is formed on the outer periphery of the top cover portion 2, extends to the curled portion 9, and is connected to the curled portion 9.

The outer display unit 40a prints a plurality of candidates of contents as characters on the outer side of the peripheral wall of the paper cover 1 so that the contents can be recognized on the side where the contents are provided. As an example, mocha coffee, black coffee, and the like are given. Note that, when the number of characters and the like are limited due to the spatial relationship of the peripheral wall of the paper cover 1, printing may be abbreviated as "printing", and printing may be abbreviated as "CAPP".

The curl display portion 40b is displayed in association with at least one of the outer display portion 40a and the inner display portion 40 c. For example, the user can recognize the contents by confirming the contents of the container 20 from among the candidates for the contents and deforming the curl display portion 40b associated with the outer display portion 40a of the contents of the container 20 by the user or the store personnel other than the user. The curled portion 9 is easily deformed by being pressed or bent with a finger, and thus the content can be recognized by other people without using a writing tool or the like.

Therefore, the curl display portion 40b is preferably a straight line, a curved line, or the like. For example, the curl display portion 40b is formed as a plurality of curves, and the shape of the curve is deformed by pressing from above, unlike a curve that is not pressed. Accordingly, other persons can recognize the content by deformation of the curled portion 9 and deformation of the printing. If the curl display portion 40b is formed as a character, the curl portion 9 is deformed into a planar shape by pressing from above, and therefore, the printed character appears large, and can be recognized according to the difference in size from the character that is not pressed. The deformation of the curled portion 9 is not limited to the pressing from above, and the curled portion 9 may be bent inward or bent outward. In this case, a notch may be provided in advance in the curl portion 22 or the peripheral wall of the paper cover 1.

Further, deformation such as opening holes in the curled portion 9 or the peripheral wall by a hole opening tool or the like may be performed. In addition, in the case where a rule that the curl portion 9 is deformed to identify the content is determined, printing of the curl display portion 40b may be omitted.

In this way, by physically deforming the curled portion 9, the content can be identified.

The inside display unit 40c prints a plurality of candidates of contents as characters on the inside of the peripheral wall of the paper cover 1 so that the user can recognize the contents. Therefore, the inside display portion 40c is preferably provided together with the curl display portion 40b at a position visually identifiable by the user from the drinking opening 5. Specifically, when the drinking opening 5 is provided on the lower side, the inner display portion 40c is preferably provided on the upper right (first quadrant) or the upper left (second quadrant) of the paper cap 1.

It should be noted that, although it is preferable that the outer display portion 40a, the curl display portion 40b, and the inner display portion 40c are provided in association with each other, the outer display portion 40a may be provided independently of the inner display portion 40c so that the side where the contents are provided can recognize the contents, and may be provided at any position outside the peripheral wall of the paper cover 1. From the viewpoint of easy printing, the printing of the display portion 40 including the curled display portion 40b is preferably performed before the curled portion 9 is formed.

The display portion 40 may be formed by a label instead of printing. Further, a mark may be provided on the top cover portion 2 in association with the display of the outside display portion 40a or the inside display portion 40 c. In this case, a mark may be drawn on the top cover portion 2 by a writing tool.

In the case where the curled portion 9 and a part of the peripheral wall of the paper cover 1 are physically deformed, a notch may be provided in the curled portion 9 or the peripheral wall of the paper cover 1 in the manner described above. Fig. 26 is an expanded view of the paper cover 1 with the top cover part 2 removed, showing an example in which the notch 41 is formed in the periphery of the display part 40. As shown in fig. 26, the paper cover 1 with the top cover portion 2 removed has a fan shape, and the curled portion 9 is formed by joining both left and right ends and curling the curled portion forming region 9a of the upper end portion. Then, by being joined to the top cover part 2 of the other member, a paper cover 1 is formed. The joint portions at the left and right ends are seams, and the contents from the container 20 easily leak out of the seams. The means for preventing leakage from the joint will be described in detail later.

The tip of the curl portion forming region 9a is curled into the curl portion 9, and therefore, even if printing for the curl display portion 40b is performed, it cannot be visually confirmed. Therefore, the tip of the curl portion-forming region 9a may not be printed for the curl display portion 40 b. Further, the curl portion forming region 9a needs to be rigid for forming the curl, which does not correspond to forming the notch 41 in the curl portion forming region 9a before forming the curl portion 9. Therefore, it is preferable that the notch 41 is provided outside the both ends of the display portion 40 avoiding the curl portion forming region 9 a. After the curled portion 9 is formed, a notch may be provided in the curled portion 9 so that the region including the display portion 40 is folded inward or outward.

It is preferable to form the notch 41 after printing the display portion 40, from the viewpoint of ease of manufacturing, but the present invention is not limited thereto. The notched portions 41 may be formed after the curled portion 9 is formed. The notch 41 may be formed as a half cut, may be formed discontinuously, or may be provided on only one side of the display unit 40.

When the display unit 40 is folded inward, the printing of the outer display unit 40a can be visually confirmed, and when the display unit 40 is folded inward, the printing of the inner display unit 40c can be visually confirmed. In this way, when the display of the display unit 40 is folded and checked, the printing of the outer display unit 40a and the inner display unit 40c need not be reversed and the printing may be performed in the same direction as the partial enlarged view of fig. 25.

Thus, the user can visually confirm the content of the container 20 by bending the display portion 40 corresponding to the content of the container 20.

It is preferable that the notch 41 is formed so as not to reach the top cover 2. This is to prevent the content from the container 20 from leaking from the notched portion 41. Further, the contents may be visually confirmed by deforming the curled portion 9 formed with the notched portion 41 by pressing without bending the notched portion 41, and by associating with the display of the display portion 40. Further, since the curl portion 9 is deformed into a planar shape by pressing from above as described above, the visual confirmation of characters, marks, figures, and the like printed on the curl display portion 40b is improved.

When one example is given from the viewpoint of convenience in drinking, the width W1 is 10mm to 25mm, preferably 15mm to 22mm, and the length L1 is 10mm to 25mm, preferably 14mm to 21mm for the size of the drinking port 5. Further, since the drinking port 5 is not easily drinkable when it is located at the outer peripheral end (peripheral wall portion) of the top cover portion 5, the length L2 from the outer peripheral end (peripheral wall portion) to the drinking port 5 is 1mm to 15mm, preferably 4mm to 12mm. When the content of the container 20 is a hot beverage, if the length L2 is set to 4mm or more, the temperature of the content decreases while passing through the top cover portion 2, so that if the content is ingested through the outer peripheral end (peripheral wall portion), the risk of scalding can be reduced. As will be described later with reference to fig. 22, the temperature of the content can be reduced while the content passes through the peripheral wall, according to the setting of the height H2 of the peripheral wall.

When considering the convenience of drinking and the concern of reducing scalding, the ratio of the length L1 of the drinking port 5 to the length L2 from the drinking port 5 is 1.1 to 10, preferably 1.1 to 5.3. The shape of the drinking port 5 is not limited to the shape shown in the drawing, and any shape may be used. The drinking port 5 may be provided with a connecting portion 5a or a groove portion 6 shown in fig. 2.

Fig. 3 is a reference diagram showing a plastic cover. Conventionally, a plastic cap is used as a cap to be fitted into the outside of the container, and there is a lower groove 50 because the cap has a fitting portion below the drinking opening 5. When the contents are ingested, the contents may overflow from the drinking port 5 to the lower groove 50, and the convenience of use may be poor. In particular, the aged can easily overflow the contents into the lower groove 50.

In contrast, in the present embodiment, the above-described groove portion 6 is provided, and thus the convenience of use of the paper cover 1 is improved.

Returning to fig. 2, when the paper cover 1 is covered on the container 20, the air hole 7 prevents the container 20 from being tightly fitted to the paper cover 1 to cause leakage. In the present embodiment, the air hole 7 is provided so as to overlap the groove 6. Thereby, the contents stored in the concave portion of the top cover 2 can be returned from the air hole 7 to the container 20. The air hole 7 may be provided so as to avoid the groove 6. The air hole 7 is not limited to the one for preventing leakage, and is formed as an escape portion for air in the container when the container is pressed, and has a function of preventing the cap 1 fitted to the container from being detached from the container.

One end of the sealing portion 8 is a sealing portion 8a for closing the drinking opening 5, and the other end 8b has a function to be described later, and forms a seal with removability.

The other end 8b may be used as a pinching portion when peeling the sealing portion 8. Alternatively, when the sealing portion 8a is grasped and the sealing portion 8 is peeled off, the other end 8b may be kept bonded to the top cover portion 2. As shown in fig. 2 (b), by attaching the adhesive surface of the grasped sealing portion 8a to the tapered portion 21 or the curled portion 22 of the container 20, the paper lid 1 and the container 20 are joined by the sealing portion 8, and therefore, the paper lid 1 can be prevented from falling down to the container 20 or separating from the container 20, and the convenience of use of the paper lid 1 can be improved.

Further, a flat portion may be provided by flattening a part of the upper side of the curled portion 22 of the container 20, and the flat portion may be joined to the bottom surface of the tapered portion 3 or the bottom surface of the bottom cover portion 4. As a bonding method in this case, ultrasonic sealing, heat sealing, adhesion, or the like can be used.

In the case of grasping the other end 8b and using it, the other end 8b may not be coated with an adhesive. In contrast, when the adhesive surface of the seal portion 8a is bonded to the tapered portion 21 or the curled portion 22 of the container 20, the other end 8b may be bonded stronger than the seal portion 8 a. In any case, the adhesion of the sealing portion 8a and the adhesion of the other end 8b are different.

The container 20 is a paper container having an opening at an upper side, and has a tapered portion 21, a curled portion 22, and a bottom portion 23. In the present embodiment, since the taper portion 21 of the container 20 is in the reverse direction of the taper portion 3 of the paper cap 1, when the paper cap 1 is pushed into the container 20, the sealing property between the paper cap 1 and the container 20 is improved, and even when the container 20 is put down, the possibility of spillage of the contents of the container 20 can be reduced. Further, various printing can be performed on the paper cover 1. Although the details will be described in the third embodiment described later, marks (lines, marks, notes) for pressing the paper cover 1 into the container 20 may be printed on the tapered portion 21 (side surface). Further, when printing is performed on the concave portion of the top cover portion 2, the user can easily visually confirm the concave portion, and the description of the product or the description of the notice can be performed by printing. Note that a mark (line, mark, or note) for pressing the paper cover 1 into the container 20 may be provided, and a notice such as a mark for pressing the paper cover 1 into the container 20 or a mark that is not visible may be printed in the concave portion or the tapered portion 3 of the top cover 2. The mark and the note of the paper cover 1 may be combined with the mark and the note of the container 20 to form a new mark or a new note. The paper cap 1 of the present invention is not limited to use in paper containers, and may be used as a cap for various containers such as plastic containers and foamed plastic containers.

(second embodiment)

A description will be given of a second embodiment with reference to fig. 4. Fig. 4 is a cross-sectional view of the paper cover 1 and the container 20 according to the second embodiment, fig. 4 (a) is a cross-sectional view showing a state in which the paper cover 1 is removed from the container 20, and fig. 4 (b) is a cross-sectional view showing a state in which the paper cover 1 is fitted into the container 20.

In the present embodiment, the paper cover 1 is also provided with a curled portion 9. The curled portion 9 may be integrally provided to the paper cover 1, or the curled portion 9 may be separately joined to the paper cover 1.

In the present embodiment, the sizes of the curl portion 9 and the curl portion 22 are different, and when the curl portion 9 is made larger, the sealing property between the paper lid 1 and the container 20 when the curl portion 9 and the curl portion 22 are fitted can be improved. In this case, even when the container 20 is set down, the possibility of the content of the container 20 overflowing can be reduced.

It is to be noted that 1 flat portion may be provided by flattening a part of the lower end of the curled portion 9, 1 flat portion may be provided by flattening a part of the upper end of the curled portion 22, and the flat portions may be joined to each other to constitute a hinge portion. In this case, the size of the curled portion 9 may be smaller than the size of the curled portion 22.

(third embodiment)

A third embodiment will be described below with reference to fig. 5. Fig. 5 is a schematic view of the paper cover 1 with the holder 30 according to the third embodiment, fig. 5 (a) is a view showing a state before attachment, and fig. 5 (b) and fig. 5 (c) are views showing a state after attachment.

The holder 30 is formed of a paper material and is a tapered annular member having the same taper as the tapered portion 21 of the container 20. A part of the tapered annular member of the holder 30 may be cut off.

In order to prevent the container 20 from being erroneously dropped, the surface of the holder 30 may be provided with irregularities by press working, embossing, or the like, or may be coated with an anti-slip agent.

The hinge 31 is a connecting member connecting the bracket 30 and the paper cover 1. The hinge 31 is formed of a paper material, and has one end coupled to the tapered shape of the bracket 30 and the other end coupled to the paper cover 1. In this case, it is desirable that: the other end of the hinge 31 is joined to the concave portion of the top cover 2. The hinge 31 may be bent into a zigzag shape to maintain elasticity. The hinge 31 may be formed of a wire or a cloth.

A mark 10 to be a mark for pressing the paper lid 1 into the container 20 is printed on the side surface of the paper lid 1.

The joining method of the hinge 31 may be any of various joining methods such as ultrasonic joining, heat sealing, and adhesive bonding.

The container 20 has various sizes (S size, M size, L size, etc.), and the diameters of the curled portion 22 and the tapered portion 21 vary depending on the size. Therefore, in the present embodiment, the size of the paper cover 1 is made to coincide with the size of the stand 30. For example, if the paper cover 1 has an L-size, the bracket 30 also has an L-size.

Thus, the holder 30 is fixed to the container 20, and thus the user does not feel a sense of discomfort.

Fig. 5 (b) shows an example in which the holder 30 is located at the center in the height direction of the container 20. Further, an example in which the hinge 31 is not connected to the paper cover 1 and the container 20 except for both end portions thereof is shown.

Fig. 5 (c) is an example in which the holder 30 is located at the upper portion of the container 20 in the height direction. Further, an example in which the hinge 31 is assembled in such a manner as to be in contact with the paper cover 1 and the bracket 30 is shown. In this case, if the hinge 31 is brought into contact with the side surface and the concave portion of the top cover 2, the top cover 2 can be pressed against the container 20 by the hinge 31, and therefore, the paper cover 1 can be prevented from falling down to the container 20 or being separated from the container 20, and the convenience of use of the paper cover 1 can be improved. In this case, it is desirable that: the paper cover 1 and the container 20 are joined by the sealing part 8.

In fig. 5 (b), the hinge 31 may be connected to the paper lid 1 and the container 20.

In the present embodiment, the tapered portion 3 of the paper cover 1 may have the same taper (forward taper) as the tapered portion 21 of the container 20.

(fourth embodiment)

A fourth embodiment will be described below with reference to fig. 6. Fig. 6 is a schematic view of the paper cover 1 with the holder 30 according to the fourth embodiment, fig. 6 (a) is a view showing a state before attachment, and fig. 6 (b) and 6 (c) are views showing a state after attachment.

In the present embodiment, the holder 30 is a tapered annular member having a taper opposite to the taper portion 21 of the container 20. A part of the tapered annular member of the holder 30 may be cut off.

In the third embodiment and the fourth embodiment, the paper cover 1 and the holder are integrated via the hinge 31, so that even in the case where the content of the container 20 is hot, the container 20 is not hot and cannot be held, and the content of the container 20 is not cooled.

Fig. 7 is a modified example of the paper cover 1 with the holder 30 of the third and fourth embodiments, and shows an example in which a handle and a holder are provided in the paper cover 1. As shown in fig. 7, the handle is provided by extending the bracket 30 laterally and providing an opening 32 in the extended portion. In this way, the cover, the holder, and the handle are integrally formed, so that the container 20 can be easily carried.

The paper cover 1 according to the first and second embodiments can be stored and transported in an overlapping manner, and thus can reduce the logistic cost.

In the paper cover 1 with the holder 30 according to the third and fourth embodiments, the paper cover can be stored and transported in an overlapping manner, and therefore, the logistic cost can be reduced.

In the lid shown in the reference diagram of fig. 3, when the lid is removed from the container, the drinking port 5 is placed on a desk or the like, and the drinking port 5 is not sanitary but is connected to the desk. In contrast, when the drinking spout 5 is placed on the table in reverse, the contents of the container adhere to the underside of the lid, and thus the contents adhere to the table, creating the need to clean the table.

In contrast, the paper cover 1 with the holder 30 according to the third and fourth embodiments holds the paper cover 1 in the holder 30 even when the paper cover 1 is removed. Therefore, the drinking opening 5 does not come into contact with the desk, and the contents attached to the bottom cover portion 4 do not fall down to the desk through the tapered portion 3, thereby improving the convenience of use of the paper cover 1.

(fifth embodiment)

In the above-described embodiment, an example in which the tapered portion 3 is fitted inside the container 20 to fit the paper lid 1 inside the container 20 is described, and an example in which the paper lid 1 is fitted outside the container 20 is described below.

Fig. 8 is a schematic view of a paper cover 1 of the fifth embodiment, and fig. 8 (a) to 8 (e) disclose 5 examples and are sequentially described. In order to simplify the drawing, the illustration of the drinking port 5 and the like is omitted.

The paper cover 1 of fig. 8 (a) is provided with a second tapered portion 11 for fitting to the outside of the curled portion 22. Further, since the paper cover 1 is fitted to the outside of the container 20, the size thereof becomes larger than in the case of fitting to the outside of the container 20. As shown in fig. 8 (a), if the curled portion 22 is fitted by the second tapered portion 11, the cost of the paper cover 1 can be reduced. Such a paper cap 1 is suitable for a cap of a cooling container 20.

In fig. 8, the size of the paper cover 1 is exaggeratedly shown, and the size thereof is not limited to the size shown in the drawing.

The paper cover 1 of fig. 8 (b) is provided with an engaging portion 12 which can engage with the inside of the curled portion 22, in addition to the second tapered portion 11. The engaging portion 12 is made of a paper material, and may have a circular shape, an elliptical shape, a rectangular shape, or the like. In the present embodiment, the engaging portion 12 is formed separately from the paper cover 1, and is joined by various joining methods such as adhesion and ultrasonic joining. When films are coated on the joining portions of the paper cover 1 and the engaging portion 12, the paper cover 1 and the engaging portion 12 can be joined by heat sealing.

By positioning the curled portion 22 between the second tapered portion 11 and the engaging portion 12, the risk of the paper lid 1 being detached from the container 20 can be reduced. Therefore, the engaging portion 12 may not always contact the curl portion 22, and for example, if the paper cover 1 is fitted into the container 20 and the second tapered portion 11 is fitted into the curl portion 22, a gap of about 0.1mm to 1.5mm may exist between the engaging portion 12 and the curl portion 22. The engaging portion 12 may be formed to engage with the entire periphery of the curled portion 22, or may be formed to engage with the curled portion 22 at a plurality of positions.

In the paper cover 1 of fig. 8 (c), the engaging portion 12 is formed of the base portion 12a and the engaging portion 12 b. The base 12a and the engaging portion 12b may be integrally formed, or may be formed separately and then joined. As shown in fig. 8 (c), the engaging portions 12b may be engaged with the curled portion 22 at two positions, or may be formed so as to be engageable with the entire circumference of the curled portion 22 instead.

In this way, by forming the engaging portion 12 from the base portion 12a and the engaging portion 12b, the amount of paper material used for the engaging portion 12 can be reduced.

In fig. 8 (a) to 8 (c), the second tapered portion 11 is illustrated as a forward tapered portion, but may be an inverted tapered portion, or may be a straight portion instead of a tapered portion. In addition, in the case where the paper cover 1 is fitted to the outside of the container 20, the tapered portion 3 may be formed in a straight line.

Further, when the curled portion 9 is crushed in the height direction (Z direction), the height of the curled portion 9 becomes high, and the distance from the drinking opening 5 formed in the concave portion becomes long, so that the paper cap 1 which is easier to drink can be realized. The curled portion 9 is preferably about 0.5mm to 1mm in the width direction. In the case where the curled portion 9 is crushed by press working, the press workability of the curled portion 9 can be improved by heating a part of the press working machine (for example, a lower die holding the paper cover 1) to 50 to 90 ℃. Further, when the curled portion 9 is crushed, the outer shape of the paper cover 1 can be made smaller, so that the number of times of conveying the paper cover 1 can be increased, and the conveying cost per unit paper cover 1 can be reduced.

In fig. 8 (b), the engagement portion 12 is engaged with the curl portion 22 from the inside of the curl portion 22, but as shown in fig. 8 (d), the engagement portion 12 may be engaged with the curl portion 22 from the upper side of the curl portion 22. In this case, it is desirable that: the engaging portion 12 is engaged with the curled portion 22 inside the curl center of the curled portion 22.

Similarly, in fig. 8 (c), the engagement portion 12b is engaged with the curl portion 22 from the inside of the curl portion 22, but as shown in fig. 8 (e), the engagement portion 12b may be engaged with the curl portion 22 from the upper side of the curl portion 22. In this case, it is desirable that: the engaging portion 12 is engaged with the curled portion 22 inside the curl center of the curled portion 22.

As shown in fig. 8 (a) to 8 (e), when the curled portion 9 is formed on the upper side of the paper cover 1, that is, when the second tapered portion 11 and the tapered portion 21 are tapered forward, it is preferable that the size of the inner diameter of the tip end (bottom cover portion 4 side) of the second tapered portion 11 is the same as or slightly smaller than the outer diameter of the curled portion 22. Thus, when the paper lid is fitted into the container 20, the curled portion 22 is crushed (deformed), and the paper lid 1 is fitted into the container 20, so that the sealing performance between the paper lid 1 and the container 20 can be improved.

In the reference example shown in fig. 3, there is a fitting portion with the container 20 at the same position as or below the lower groove portion 50, and since the plastic cover is removed from the vicinity of the fitting portion, there is a concern that the content touches the hand of the user and burns.

In contrast, as described above, in the present embodiment, since the curl portion 9 is located above the position where the paper cover 1 is fitted to the container 20, the paper cover 1 can be easily removed from the container 20 by holding the curl portion 9 or the peripheral wall around it with a hand, and there is no fear that the contents touch the user's hand.

In addition, in the reference example shown in fig. 3, the plastic cap is removed from below the drinking port 5, so there is a concern that the contents touch the user's hand from the drinking port 5.

In contrast, in the present embodiment, since the paper cap 1 is removed by holding the curled portion 9 formed on the upper side of the paper cap 1 located above the drinking port 5 or the peripheral wall around the curled portion with a hand, there is no concern that the contents will touch the hand of the user from the drinking port 5. Note that, if the paper lid 1 is of a type that the paper lid 1 is removed to drink the content of the container 20, the drinking port 5 may be omitted.

As shown in fig. 8 (a) to 8 (e), when the curl portion 9 is formed on the upper side of the paper cover 1, the mouth is attached to the curl portion 9 to drink the contents from the drinking opening 5 formed in the top cover portion 2. This is the same taste as when drinking the contents from the paper container 20 by attaching the mouth to the curl portion 22. Therefore, the user does not feel the offensive sense felt when drinking the contents from the drinking port of the plastic cap. Further, since the tapered portion 3 and the tapered portion 21 are tapered in the forward direction, the mouth can be attached to the curled portion 9 at the same angle as when the content is drunk from the paper container 20, and the content can be drunk from the drinking port 5. This allows the contents to be drunk from the paper cap 1 with the same taste as when the contents are drunk from the paper container 20.

(sixth embodiment)

Fig. 9 is a schematic view of the paper cap 1 of the sixth embodiment, and shows an example in which the paper cap 1 is fitted to the outside of the container 20 as in the fifth embodiment. Fig. 9 (a) to 9 (d) disclose 4 examples, and are described in order. In order to simplify the drawing, the illustration of the drinking port 5 and the like is omitted.

In the present embodiment, the engaging portion 12 is tapered, and a tapered portion 12c is formed. The taper portion 12c has the same taper (forward taper) as the second taper portion 11, but may have an inverted taper with a different taper direction or may have a different taper angle.

In the paper cap 1 of fig. 9 (a), the tip of the second tapered portion 11 protrudes toward the container 20 than the tip of the tapered portion 12c so that the tapered portion 12c engages with the curled portion 22 after the second tapered portion 11 starts to engage with the curled portion 22. In other words, the engaging portion 12 is located in a space formed inside the second tapered portion 11. Therefore, the second tapered portion 11 engages with the curled portion 22, and thereby the curled portion 22 and the upper portion of the tapered portion 21 receive an inward force. In this state, the tapered portion 12c is engaged with the curled portion 22, and thus an outward force is applied to the curled portion 22 and the upper portion of the tapered portion 21, so that the paper cover 1 can be tightly fitted into the container 20. In this way, by making the taper length of the taper portion 12c shorter than the taper length of the second taper portion 11, the paper cover 1 can be easily removed from the container 20. Even in this case, by making the taper length of the taper portion 12c longer than the diameter of the curl portion 22, the paper cap 1 can be reliably fitted into the container 20, and even when the temperature of the content of the container 20 is high, accidents due to scalding can be reduced.

The upper surface of the engaging portion 12 may be formed with a curled portion, and the engaging portion 12 and the bottom cover portion 4 may be joined by the curled portion.

In the paper cover 1 of fig. 9 (b), the tip of the second tapered portion 11 is made to coincide with the tip of the tapered portion 12c so that the second tapered portion 11 and the tapered portion 12c are engaged with the curled portion 22 at substantially the same time. In the present embodiment, the tip of the second tapered portion 11 is aligned with the tip of the tapered portion 12c by the base portion 12a, but the tip of the second tapered portion 11 may be aligned with the tip of the tapered portion 12c by adjusting at least one of the sizes of the second tapered portion 11 and the tapered portion 12 c. By matching the tip of the second tapered portion 11 with the tip of the tapered portion 12c in this manner, the paper cap 1 can be fitted into the container 20 with good balance.

In the paper cap 1 of fig. 9 (c), the tip of the tapered portion 12c protrudes toward the container 20 more than the tip of the second tapered portion 11 so that the second tapered portion 11 engages with the curled portion 22 after the tapered portion 12c starts to engage with the curled portion 22. In the present embodiment, the tip of the tapered portion 12c is projected toward the container 20 by the base portion 12a than the tip of the second tapered portion 11, but the tip of the tapered portion 12c may be projected toward the container 20 than the tip of the second tapered portion 11 by adjusting at least one of the sizes of the second tapered portion 11 and the tapered portion 12 c. By projecting the tip of the tapered portion 12c further toward the container 20 than the tip of the second tapered portion 11, the engagement between the tapered portion 12c and the curled portion 22 can be guided, and the second tapered portion 11 can be fitted into the curled portion 22. Thereby, the paper cover 1 can be easily fitted into the container 20.

Fig. 9 (d) shows an example in which an opening 33 is provided on the upper surface of the engaging portion 12. The engagement between the top cover portion 2 and the engaging portion 12 is only the outer periphery of the engaging portion 12 through the opening 33, so that the weight of the engaging portion 12 can be reduced. In addition, an opening may be formed in the top cover part 2 to reduce the weight of the top cover part 2.

Fig. 10 and 11 are diagrams showing a method of manufacturing the paper cover 1 according to the sixth embodiment, and the method of manufacturing the paper cover 1 according to the sixth embodiment will be described below with reference to fig. 10 and 11. The paper lid 1 according to the sixth embodiment is manufactured by using the bottom 23 of the container 20 having different sizes, but the present invention is not limited to this, and the paper lid 1 may be manufactured by press working or manufacturing a paper material. In this case, the press workability of the paper cover 1 can be improved by heating at least a part of the press working machine (for example, a lower die holding the paper cover 1) to 50 to 90 ℃. The explanation is continued taking the paper cover 1 shown in fig. 9 (a) as an example.

Fig. 10 (a) shows the bottoms 23a, 23b of two containers 20 of different sizes. The bottom 23a is according to a rollThe outer side (outer diameter) of the curved portion 22 is formed in size. The bottom 23b is formed according to the size of the inside (inner diameter) of the curled portion 22. As can also be seen from fig. 10 (a), a portion of the bottom portion 23a (the top cover portion 2 and the bottom cover portion 4) has a shape similar to the bottom portion 23b. Therefore, when the tapered portion 3 is the first engagement portion, the tapered portion 12c is the second tapered portion, and the paper lid 1 is fitted into the container, the risk of spillage of the contents of the container 20 can be reduced even when the container 20 is set down. The bottom portion 23a and the bottom portion 23b may have the same weight per unit area, but the bottom portion 23a fitted to the outside of the container 20 is required to have strength, so that it is desirable to have the weight per unit area of the bottom portion 23a larger than the weight per unit area of the bottom portion 23b. When an example is given, the weight per unit area of the bottom portion 23a is 200g/m ² To 360g/m ² The weight per unit area of the bottom 23b was 150g/m ² To 199g/m ² . In this case, when the weight per unit area of the second tapered portion 11 is set to 200g/m2 to 360g/m2 and the weight per unit area of the tapered portion 12c is set to 150g/m2 to 199g/m2, the resistance (rigidity) of the tapered portion 12c becomes small, and therefore the paper cover 1 is easy to detach.

The same paper material may be used for the bottom portion 23a and the bottom portion 23b, or different paper materials may be used.

Fig. 10 (b) forms a curled portion 9 above the bottom portion 23 a. Fig. 11 is a partial enlarged view of the curl forming die 70. The curl forming die 70 has an upper die 71, an upper die groove portion 72, a lower die 73, and a lower die groove portion 74. The upper die 71 has a top end portion accessible above the bottom portion 23 a. The upper die 71 includes an upper die groove 72 having a curved shape. The lower die 73 has: a holding portion for holding the bottom portion 23a; and a lower cavity 74 opposed to the upper cavity 72.

When the lower die 73 holding the bottom portion 23a moves toward the upper die 71, the tip of the bottom portion 23a contacts the upper die groove 72, slides along the curved surface of the upper die groove 72 on the surface of the upper die groove 72, is pressed and developed so as to open outward, gradually becomes round, and contacts the lower die groove 74. Thereby, the upper portion of the bottom portion 23a is curled.

Fig. 10 (c) shows a case where the top cover part 2a of the bottom part 23a is connected to the bottom side of the top cover part 2 of the bottom part 23 b. The joining of the cover part 2 and the cover part 2a may be performed by various joining methods such as adhesive bonding and ultrasonic joining. For example, if films are applied to the joint portions of the top cover portion 2 and the top cover portion 2a, the concave portions of the top cover portion 2 and the concave portions of the top cover portion 2a are each formed as flat surfaces, and therefore the top cover portion 2 and the top cover portion 2a can be joined by heat sealing. It is preferable that the joining of the top cover portion 2 and the top cover portion 2a is performed so that the centers of the top cover portion 2 and the top cover portion 2a coincide with each other, but the present invention is not limited to this. For example, the centers of the top cover portion 2 and the top cover portion 2a may be offset so that the fitting of the curled portion 22 by the second tapered portion 11 and the tapered portion 12c becomes tight at and near the drinking port 5.

After the top cover 2 and the top cover 2a are joined, the paper cover 1 can be manufactured by processing the drinking opening 5, the air hole 7, and the like.

Fig. 12 is a diagram showing a method of manufacturing another paper cover 1. In the present embodiment, the paper lid 1 is manufactured using the bottom 23 of the container 20, but the present invention is not limited to this, and the paper lid 1 may be manufactured by press working a paper material.

Fig. 12 (a) is a view in which the bottom 23 of the container 20 is cut out to a predetermined size, and the lower end is bent inward as indicated by an arrow.

Fig. 12 (b) is a view of the lower end portion bent inward. By bending the lower end portion inward, as shown in fig. 12 b, there are a portion where the paper material is 2 layers and a portion where the paper material is 1 layer (a portion shown by an arrow). When the paper cover 1 is fitted into the container 20, the curled portion 22 of the container 20 is hung on the 1-layer portion to be held. Further, since the tapered portion 3 of the paper cover 1 is fitted to the tapered portion 21 of the container 20, the paper cover 1 can be tightly fitted into the container 20.

In the present embodiment, the tapered portion 3 of the paper cover 1 and the tapered portion 21 of the container 20 are formed in the reverse taper, but the tapered portion 3 of the paper cover 1 and the tapered portion 21 of the container 20 may be formed in the forward taper, or the tapered portion 3 may be formed in a straight line. If the lower end is bent inward and the inner surface is provided with a convex portion or the inner surface is corrugated, the paper cover 1 can be fitted into the container 20 more tightly.

It should be noted that, as shown in fig. 4, fitting the curled portions to each other, fitting the curled portions to the tapered portions as shown in fig. 9 and 10, and the like have been disclosed in japanese patent application publication No. 2018-138005 of application No. 2018, 7 and 23, which is based on U.S. provisional application No. 62/696895, by the applicant of the present application, and the disclosure of which is incorporated herein by reference, and the content of which will be described below. The symbol is changed only for the portion where the symbol is repeated.

Fig. 13 (fig. 38 of japanese patent application publication No. 2018-138005) is a view showing another example of a fitting member using the crimping member 52 (56). Fig. 13 (a) is a diagram showing an example in which a tapered annular groove portion 55 is provided in the mounting portion 104. The taper of the tapered annular groove portion 55 narrows from the upper surface to the lower surface of the mounting portion 104. Therefore, the fitting width W5 of the upper surface of the mounting portion 104 is larger (wider) than the fitting width W3 of the crimping member 52.

Fig. 13 (b) is a diagram showing an example in which the crimping member 56 is provided in the mounting portion 104, and the tapered annular groove portion 57 is provided in the lid portion 105. The constitution of the crimping member 56 is the same as that of the crimping member 52. The width W6 of the tapered annular groove 57 on the side of the facing surface facing the mounting portion 104 is larger (wider) than the fitting width W7 of the crimping member 56.

Fig. 13 (c) shows an example in which a recess 15 having a tapered annular peripheral edge is provided in the lid 105, and the crimping member 52 is engaged in the tapered annular recess 15. The crimping member 52 is engaged along the tapered surface of the recess 15, and therefore positioning of the crimping member 52 can be easily performed. Further, a part of the crimping member 52 protrudes from the recess 15 toward the mounting portion 104.

Fig. 13 (c) shows an example in which a recess 58 having a tapered peripheral edge is provided in the mounting portion 104, and the crimping member 56 is engaged with the recess 58 so that the crimping member 56 is accommodated in the recess 58. The crimping member 56 is engaged along the tapered surface of the recess 58, and thus positioning of the crimping member 56 can be easily performed.

The long diameter d5 of the crimping member 52 is larger than the inner diameter d6 of the crimping member 56, and at least one of the crimping member 52 and the crimping member 56 is elastically deformed when the lid 105 is closed, whereby the crimping member 52 is fitted in the crimping member 56.

Fig. 13 (d) includes a tapered convex portion 17 provided on the periphery of the mounting portion 104. The long diameter d5 of the crimping member 52 is larger than the outer diameter d7 of the protruding portion 17, and the crimping member 52 elastically deforms when the lid 105 is closed, whereby the crimping member 52 is fitted to the protruding portion 17.

In fig. 13 (a) to 13 (d), the shape and size of the curl members 52, 56, the groove portions 55, 57, and the recess portion 58 are preferably set so that the upper surface 104a of the attachment portion 104 contacts the upper surface 105a of the lid portion 105 when the lid is closed. Further, a foamable ink or a foamable hot melt adhesive containing a foaming agent may be applied and foamed to at least a part of the curling members 52, 56, the grooves 55, 57, and the recesses 15, 58. The concave portions 55, 57, the concave portions 15, 58, and the convex portions 17 may be formed by press working.

From the above description, it is known that, for example, fitting the curled portions to each other and fitting the curled portions to the tapered portions, japanese patent application publication No. 2018-138005.

The paper cover 1 of the sixth embodiment may be fitted in other ways. Fig. 19 is a modified example of the paper cover of the sixth embodiment, and 6 examples are disclosed in fig. 19 (a) to 19 (f) and described in order. Here, fig. 19 (a) to 19 (c) show examples in which the tapered portion 12c of the engaging portion 12 and the tapered portion 21 of the container 20 are tapered in the forward direction, and fig. 19 (d) to 19 (f) show examples in which the tapered portion 12c of the engaging portion 12 and the tapered portion 21 of the container 20 are tapered in the reverse direction. In order to simplify the drawing, the illustration of the drinking port 5 and the like is omitted.

In fig. 19 (a), a curled portion 29 is formed on the upper surface of the engaging portion 12, and the engaging portion 12 is engaged with the top cover portion 2 by the curled portion 29. By fitting or engaging the curl portion 29 with the curl portion 22 of the container 20, fitting or engaging the second tapered portion 11 with the curl portion 22, and fitting the tapered portion 12c of the engaging portion 12 with the inner surface of the tapered portion 21 of the container 20, even when the container 20 is put down or excessively inclined, the fitting or engaging and both sides thereof are utilized at 3 described above, and therefore, the sealing performance between the paper lid 1 and the container 20 is improved, and the possibility of spillage of the contents of the container 20 can be reduced.

Fig. 19 (b) shows an example in which the curled portion 29 is flattened along the Z axis of fig. 19 (b) and extends in the X axis direction. By thus flattening and laterally lengthening the curled portion 29, the joining area between the curled portion 29 and the top cover portion 2 can be increased, and therefore the engaging portion 12 can be reliably joined to the top cover portion 2. Further, the contact area between the curled portion 29 and the curled portion 22 can be increased, and thus the concern of spillage of the contents of the container 20 can be reduced. The curled portion 29 can be flattened along the Z axis by press working and extended in the X axis direction.

Fig. 19 (c) shows an example in which the curled portion 29 is flattened along the X axis of the same figure and extends in the Z axis direction. By making the curled portion 29 longer in the longitudinal direction in this way, a space is formed between the lower surface of the top cover portion 2 and the upper surface of the bottom cover portion 4, and this space functions as a heat insulating portion, so that the heat insulating property of the content in the container 20 can be improved. Further, the contact area between the curled portion 29 and the curled portion 22 can be increased, and thus the concern of spillage of the contents of the container 20 can be reduced. The curled portion 29 can be flattened along the Z axis by press working and extended in the X axis direction. The curled portion 29 functions as a seal (packing), and thus the risk of spillage of the contents of the container 20 can be reduced.

Fig. 19 (d) shows an example in which the engaging portion 12 shown in fig. 19 (a) is turned up and down to engage with the top cover portion 2. Thus, the tapered portion 12c of the engaging portion 12 and the tapered portion 21 of the container 20 are formed into an inverted taper.

When the tapered portion 12c and the tapered portion 21 are in the reverse tapered shape, the force during fitting is concentrated on the fitting portion as compared with the case of surface contact, because the force is in point contact (line contact) rather than surface contact during fitting. Therefore, the fitting between the tapered portion 12c and the tapered portion 21 is improved, and thus the sealing performance of the paper cover 1 is improved. Since the tapered portion 12c and the tapered portion 21 are made of paper, the tapered portion 12c and the tapered portion 21 are deformed by fitting to form a plurality of flat portions. The flat portion improves the fitting of the tapered portion 12c and the tapered portion 21. Further, when the paper cover 1 is removed from the container 20, the tapered portion 12c is in point contact (line contact) with the tapered portion 21, and therefore the fitting length is shorter than in the case of the forward taper, and therefore the paper cover 1 can be easily removed.

Fig. 19 (e) shows an example in which the curled portion 29 is flattened along the Z axis of fig. 19 (e) and extends in the X axis direction. By thus flattening and laterally lengthening the curled portion 29, the fitting position of the tapered portion 12c and the tapered portion 21 can be made smaller than in the example of fig. 19 (d).

Fig. 19 (f) shows an example in which the curled portion 29 is flattened along the X axis of fig. 19 (f) and extends in the Z axis direction. By making the curled portion 29 longitudinally longer in this way, the fitting position between the tapered portion 12c and the tapered portion 21 can be made larger than in the example of fig. 19 (d). By setting the tapered portions 12c and 21 to be inverted tapered and appropriately setting the size of the fitting portion between the curled portion 29 and the tapered portion 21, the paper cover 1 with good usability can be realized.

The paper cover 1 according to the fourth and fifth embodiments may be provided with a belt holder 30.

In addition, various modifications and the like can be made. A modified example of the sealing portion 8 of fig. 2 will be described below with reference to fig. 14 and 15. In fig. 14 (a), the sealing portion 8 is bent in a C shape, and is bonded to the concave portion of the top cover portion 2 by an adhesive 13 applied to the lower surface side of the sealing portion 8. An adhesive 14 is applied to the upper surface side of the sealing portion 8. It should be noted that it is desirable that: the adhesive 14 is a releasable adhesive.

Fig. 14 (b) shows a case where one end of the upper surface of the sealing portion 8 is pulled out, and the one end of the upper surface of the sealing portion 8 is joined to the tapered portion 21 of the container 20 by the adhesive 14. In this way, by joining the paper lid 1 to the container 20 using the seal portion 8, the paper lid 1 can be prevented from falling off into the container 20. In fig. 14, the adhesive 14 is applied to the end of the upper surface of the sealing portion 8, and it is desirable that the adhesive 14 is not stuck to the hand: the adhesive 14 is applied offset from the end of the upper surface. In the present embodiment, the adhesive force of the adhesive 13 is larger than the adhesive force of the adhesive 14. Instead of, or in addition to, the adhesive 13 is preferably applied in an amount greater than the adhesive 14. The lower surface of the sealing portion 8 may be joined to the concave portion of the top cover portion 2 by heat sealing instead of the adhesive 13.

Fig. 15 shows an example in which the adhesive 14 of the paper lid 1 of fig. 14 is omitted, and the paper lid 1 is prevented from falling into the container 20 by engaging the end of the upper surface of the sealing portion 8 with the curled portion 22 instead of the adhesive 14. The end of the upper surface of the sealing portion 8 is formed in a V-shape so as to engage with the curled portion 22. In order to maintain the V-shape, it is preferable to join the V-shaped valley portions in advance by various joining methods such as bonding, heat sealing, ultrasonic joining, high-frequency joining, and the like.

The sealing portion 8 in fig. 14 and 15 may be a sealing member that covers the drinking port 5, or may be a different sealing member than the sealing member that covers the drinking port 5. In the case of covering the drinking opening 5 with the sealing portion 8, it is desirable that: the adhesive 13 is not provided at a portion facing the drinking port 5 and the periphery thereof.

(seventh embodiment)

Fig. 16 is a schematic view of a paper cover 1 according to the seventh embodiment. In order to simplify the drawing, the seal portion 8 illustrated in fig. 2 is omitted. In the present embodiment, a window 18 for visually checking the content of the container 20 is provided, and a notch 24 is provided in the window 18. The window 18 may be formed in a recess or the like of the top cover 2.

Fig. 16 (a) shows a circular window 18, but the shape and size of the container 20 may be any shape and size as long as the contents can be visually confirmed. As shown in fig. 16 (b), the window 18 may be shaped so as not to interfere with the drinking opening 5.

In the present embodiment, the window 18 is a transparent member, and various films such as polypropylene and polyethylene can be used. As the transparent member, cellulose nanofibers may be used, or the paper cover 1 may be made of cellulose nanofibers.

The window 18 can be formed by forming an opening in a paper material and bonding a film as a coating layer by various bonding methods such as heat sealing or an adhesive so as to cover the opening. In this case, the film may be bonded to one side (for example, the upper surface side) of the paper material, or may be bonded to both sides (the upper surface side and the lower surface side) by providing two film rolls.

The air hole 7 may be formed at a position different from the window 18 as shown in fig. 16 (a), or may be formed at the window 18 as shown in fig. 16 (b). If the paper cover 1 is cold, the air hole 7 may be omitted.

The notched portion 24 is a member for inserting a suction pipe, and in the present embodiment, has a notched portion indicated by a solid line and half-cut portions formed at both ends of the notched portion and indicated by a broken line. If the paper cover 1 is for heating, the notch 24 may be omitted. The width of the notch 24 may be about 0.3mm to 1 mm. When the cutter is inserted into the film in a state where the film of the window 18 is stretched, and the slit capable of communicating with the container 20 side is provided, the width of the slit becomes narrower as the film moves toward the container 20 side due to the elasticity of the film when the cutter is pulled out. Therefore, in the state before the straw is inserted, even if the paper lid 1 is fitted into the container 20 and the container 20 is turned upside down, the contents hardly leak from the notched portions 24, and even if the container 20 is not carelessly put down, the contents hardly leak from the paper lid 1. The notch 24 may be a cross, a radial line, a curved line (e.g., S-shaped), or the like.

The slit portion 24 is formed with a slit as described above, and thus the suction pipe can be easily inserted. In the present embodiment, since the half-cut portions are formed at both ends of the slit, when the suction pipe having a large diameter is inserted, the half-cut portions are broken. Therefore, the notch 24 of the present embodiment can easily insert a straw having a small diameter or even a straw having a large diameter.

Fig. 16 (c) shows an example in which 2 (multiple) window portions 18 are provided, and the cutout groove portion 24 is also provided with 2 (multiple). However, the notched portion 24 may be 1. The visual confirmatory performance can be improved by arranging the two window portions 18 in bilateral symmetry, and the visual confirmatory performance can be improved by arranging the two window portions 18 at positions offset from the center of the top cover portion 2.

In the examples of fig. 16 (a) to 16 (c), it is desirable that: the window 18 is formed to be about 5% to 50% of the area of the top cover 2. When the size of the window 18 is smaller than 5% of the area of the top cover 2, the visual visibility is deteriorated. When the size of the window 18 exceeds 50% of the area of the top cover 2, the amount of the film used increases, which is not preferable from the environmental point of view.

Further, the strength of the window 18 may be increased by performing press working around the window 18 where the notch 24 is not formed.

In addition, the display portion 40 and the notch portion 41 are provided together with the formation of the window portion 18, so that the contents of the container 20 can be more easily visually confirmed.

Fig. 17 is a cross-sectional view of a paper cover 1 according to the seventh embodiment, and fig. 17 (a) is a case where a window 18 is provided in the paper cover 1 (fig. 8 (a)) according to the fifth embodiment, and fig. 17 (b) is a case where the window 18 is provided in the paper cover 1 (fig. 9 (a)) according to the sixth embodiment. In order to simplify the drawing, the drinking spout 5, the notch 24, and the like are not shown. As shown in fig. 17 (a), a window 18 is formed in the top cover 2. In addition, a film may be stretched in the portion (lower portion of the bottom cover portion 4) marked with the symbol 4 as the window portion 18. By providing two windows 18 in this manner, the space formed by the two films functions as a heat insulating portion, and therefore, the heat insulating property of the content in the container 20 can be improved.

Fig. 17 (b) shows an example in which the window 18 is provided in the engaging portion 12 instead of the top cover portion 2. In fig. 17 (b), the opening 19 is provided in the top cover portion 2, whereby the window 18 is provided in the engagement portion 12. In place of the opening 19, a window 18 may be provided in the top cover portion 2.

The window 18 may be formed by stretching a film in the portion (lower portion of the engaging portion 12) where the symbol 12 is given, or the window 18 may be formed by stretching a film in the portion (lower portion of the bottom cover portion 4) where the symbol 4 is given. By providing two or more windows 18 in this manner, the space formed by the two films functions as a heat insulating portion, and therefore, the heat insulating property of the content in the container 20 can be improved.

Fig. 20 is a cross-sectional view of the window portion 18 of the seventh embodiment enlarged, and the notch portion 24 is omitted for simplicity of the drawing. When the notched portion 24 is formed in the window portion 18, the vicinity of the notched portion 24 becomes weaker than other portions. Accordingly, in fig. 20 (a), a reinforcing portion 27 is formed as reinforcement in the vicinity of the notched portion 24. An adhesive (e.g., a hot melt adhesive) is applied as the reinforcement 27. The adhesive hardens by drying, thereby reinforcing the vicinity of the notched portions 24.

In fig. 20 (b), the film of the window 18 is compressed as the reinforcing portion 27 to increase the density. Specifically, the film of the window 18 is compressed by heat sealing, ultrasonic bonding, high-frequency bonding, pressure bonding, or the like. Thereby, the vicinity of the notch portion 24 can be reinforced.

Fig. 21 is a modified example of the window portion 18 of the paper cover 1 of the seventh embodiment. In fig. 21 (a), the opening 19 is formed in the paper cover 1, and the notch 24 is formed as another member without forming the notch 24. The other member is a second seal 28, three examples of which are illustrated on the right side of fig. 21 (a). The following continues the description of three examples in order from the top.

Any of the second sealing portions 28 may be used, such as a film, a paper material, aluminum, a nonwoven fabric, rubber, and cloth. These materials may be used for the sub second sealing portion 28a.

The uppermost second sealing portion 28 is centrally formed with a notch portion 24. In fig. 21 (a), the second seal portion 28 has a circular shape, but may have any shape as long as it is larger than the opening 19. A removable adhesive is applied to the surface of the second seal 28 facing the opening 19, so that the second seal 28 is bonded to the periphery of the opening 19. Alternatively, the second seal portion 28 may be bonded to the periphery of the opening 19 by heat sealing, ultrasonic bonding, or high-frequency bonding.

Thereby, the suction pipe can be inserted from the notch 24.

The second sealing portion 28 in the middle is formed in a circle (doughnut), and a sub second sealing portion 28a smaller than the second sealing portion 28 is formed above the second sealing portion 28. The second sealing portion 28 is formed with the notched portion 24 as described above, and is joined around the opening 19. The sub second sealing portion 28a is coated with a releasable adhesive and bonded to the second sealing portion 28. If the notched portions 24 are not formed in the sub second seal portion 28a, the notched portions 24 of the second seal portion 28 are not exposed, and thus are sanitary. Then, by peeling the sub second sealing portion 28a from the second sealing portion 28, the suction pipe can be inserted from the notch portion 24. The slit portion 24 may be formed in the sub second seal portion 28a.

By providing the sub second seal portion 28a in this manner, the notched portion 24 formed in the second seal portion 28 can be reinforced as in the reinforcing portion 27 described above.

The lowermost second seal portion 28 is formed in a circular ring shape, and a sub second seal portion 28a smaller than the second seal portion 28 is formed above the second seal portion 28. A part of the outer periphery of the sub second sealing part 28a is not cut out but is integrated with the second sealing part 28. Therefore, by opening the sub second sealing part 28a from the second sealing part 28, the suction pipe can be inserted from the notch part 24.

Note that, a mark known as an insertion port of a pipette may be provided by printing at least one of the second seal portion 28 and the sub second seal portion 28a.

Furthermore, it is desirable that: the notch 24 is formed in a shape and size corresponding to a paper straw or a straw with a tip not sharp.

Fig. 21 (b) shows an example in which the window portion 18 and the slit portion 24 are formed in the cover portion 1, and the slit portion 24 is covered with the second seal portion 28. The size of the second seal portion 28 is larger than the size of the window portion 18, but is not limited thereto.

The uppermost second seal portion 28 may also be peeled from the window portion 18 by a re-peelable adhesive. The second seal portion 28 may be turned over by heat sealing or the like to attach the outer side Zhou Rongjie of about half of the second seal portion 28 to the window portion 18.

The middle second seal portion 28 is formed in a circular ring shape, and the sub second seal portion 28a may be peeled off from the second seal portion 28 by a removable adhesive. The sub second sealing part 28a may be turned over by heat sealing or the like to attach the outer side Zhou Rongjie of about half of the sub second sealing part 28a to the second sealing part 28. The second seal portion 28 may be formed with a cutout portion 24 corresponding to the cutout portion 24 of the window portion 18, or may be formed with an opening.

The lowermost second seal portion 28 is formed in a circular ring shape, and a sub second seal portion 28a smaller than the second seal portion 28 is formed above the second seal portion 28. A part of the outer periphery of the sub second sealing part 28a is not cut out but is integrated with the second sealing part 28. The second seal portion 28 is formed with a notch portion 24 or an opening portion corresponding to the notch portion 24 of the window portion 18.

Therefore, by opening the sub second sealing part 28a from the second sealing part 28, the suction pipe can be inserted from the notch part 24. The second seal portion 28 in fig. 21 (a) and 21 (b) may be formed of 2 seal portions (for example, semicircular, rectangular), and a part thereof may overlap by several millimeters. In addition, one end of the second seal portion 28 may be bent upward for grasping by a finger.

(eighth embodiment)

Fig. 22 (a) illustrates a cross-sectional view of a paper cover 1 of the eighth embodiment together with a partial enlarged view. In the present embodiment, a recess 35 is formed in the recess of the top cover portion 2. Further, an engaging portion 36 that engages with the curled portion 22 is engaged with the top cover portion 2. Further, the portion of the second tapered portion 11 other than a part is pressed, and as a result, the circumferential protruding portion 37 is formed. The curl portion 9 and the curl portion 22 curl outward although the drawing is simplified. In order to simplify the drawing, the drinking port 5 is not shown.

When an example of the size of the paper cover 1 is given, the diameter is about 70mm to 140mm, the overall height H1 of the paper cover 1 is 12mm to 20mm, and the paper cover 1 extends from the curled portion 9 to the top coverThe height H2 of the peripheral wall of the portion 2 is 3.5mm to 12mm. Although the height H2 of the peripheral wall is preferably 6mm to 9mm from the viewpoint of convenience in drinking, the paper lid 1 having a good balance can be obtained by setting the height to about 36% to 53% of the height H1, although the capacity of the paper lid 1 is also used. Furthermore, it is desirable that: the diameter of the curled portion 9 is about 2mm to 3mm, and the height obtained by subtracting the diameter of the curled portion 9 from the height H2 of the peripheral wall is larger than the diameter (height) of the curled portion. Thus, even when the mouth is brought into contact with the curled portion 9 to draw the hot beverage from the drinking orifice 5, the temperature of the content is lowered according to the height H2 of the peripheral wall, and thus the concern of scalding can be reduced. As described with reference to fig. 25, since the length L2 from the outer peripheral end (peripheral wall portion) to the drinking port 5 is 1 to 15mm, preferably 4 to 12mm, the length L2 from the drinking port 5 and the height H2 of the peripheral wall are set to 4.5 to 27mm, preferably 15 to 25mm, and the risk of scalding can be further reduced when the contents are ingested through the peripheral wall. Although the paper cover 1 is seen to be different in the drawings, the dimensions described above can be applied to the fourth to seventh embodiments. The paper cover 1 of the present embodiment has a weight per unit area of less than 150g/m2 to 300g/m ² Preferably 200g/m ² ～250g/m ² The left and right are good. By reducing the weight per unit area in this way, the curled portion 22 of the container 20 is not deformed or damaged when the paper cover 1 is attached to the container 20. Although the weight per unit area of the top cover portion 2 and the second tapered portion 11 may be the same or different, it is desirable that: even when the same weight per unit area is used, the thickness of the top cover portion 2 is increased to reduce the density and to make it soft.

The recess 35 of the top cover portion 2 can be formed by, for example, press working, and desirably: the depth is set to be about 0.8mm to 2.0 mm. The width of the recess 35 is preferably set to be slightly smaller than the width of the curled portion 22 so that at least the upper portion of the curled portion 22 can be accommodated at both ends of the top cover portion 2, and at least the upper portion of the curled portion 22 can be accommodated by elastic deformation of both ends of the top cover portion 2. In this way, when at least the upper part of the curled portion 22 is received by both ends of the top cover portion 2, the sealing performance between the paper cover 1 and the container 20 is improved.

In order to facilitate the formation of the recess 35, it is desirable that: the paper material (or the paper cover 1) is heated by infrared rays or hot air to a temperature (for example, 50 ℃ to 100 ℃) which does not affect the coating agent of the paper material. Further, it is preferable that the lower die of the press working machine holding the paper material (or the paper cover 1) is heated to 60 to 130 ℃, preferably 70 to 100 ℃. The heating of the paper material (or the paper cover 1) and the heating of the press working machine may be performed either or both. By forming the concave portion 35 in this manner, as shown in the partial enlarged view, the space between the second tapered portion 11 and the concave portion 35 becomes smaller, and the sealing performance when the paper cover 1 is assembled to the container 20 is improved. The recess 35 may be formed so that the end of the recess 35 contacts the curled portion 22. The concave portion 35 may be formed by press working a portion corresponding to the concave portion 35, or may be formed by press working both ends of the top cover 2 by turning over the paper cover 1.

The engaging portion 36 is an annular (circular) member formed of a paper material provided with a coating such as a film, and is joined to the inside of the top cover portion 2 by, for example, heat sealing, ultrasonic joining, or the like. The two ends of the engaging portion 36 are free ends that are not joined to the top cover portion 2. The both ends of the engaging portion 36 may be tapered, may be tapered in the same direction as the tapered portion 21, or may be tapered in a reverse direction different from the tapered portion 21.

The engaging portion 36 is of a size that can engage with the curled portion 22, but the free end of the engaging portion 36 is bent upward by engagement of the curled portion 22 although not shown. The engaging portion 36 functions as a seal, and thus, the sealing property when the paper lid 1 is assembled to the container 20 can be improved. Preferably, the weight per unit area of the engaging portion 36 is equal to or less than the weight per unit area of the paper cover 1, 150g/m ² ～250g/m ² The left and right are good.

The engaging portion 36 is annular, and therefore, a space is formed inside thereof, and this space functions as a heat insulating portion, and therefore, the heat insulating property of the content in the container 20 can be improved. Further, when the container 20 is tilted, the space S1 formed by the curled portion 22, the top cover portion 2, and the engaging portion 36 can hold the content from the container 20, and thus leakage of the content from the paper lid 1 other than the drinking port 5 can be reduced. The engaging portion 36 may be formed in a solid shape instead of a ring shape, and various corrugated papers having grooves may be used as the paper material, or a film (e.g., a polyethylene film) may be used instead of the paper material.

The inner peripheral surface of the second tapered portion 11 is compressed by pressing a part of the recessed block member. The portion not pressed by the concave portion of the block member remains as the convex portion 37. The curled portion 22 passes over the convex portion 37 and enters the space formed by the second tapered portion 11 and the concave portion 35. The convex portion 37 functions to prevent the curled portion 22 entering the space formed by the second tapered portion 11 and the concave portion 35 from coming off. The second tapered portion may have a plurality of projections 37 on its inner peripheral surface. For example, two convex portions 37 may be formed so as to be separated from each other in the vertical direction, and the curled portion 22 may be fitted between the two convex portions 37. In this case, the paper lid 1 is fitted to the container 20 by making the interval between the two protruding portions 37 narrower than the diameter of the curled portion 22, and the curled portion 22 is crushed (deformed), so that the sealing performance between the paper lid 1 and the container 20 can be improved. The convex portion 37 may be provided intermittently, not continuously, on the inner periphery of the second tapered portion 11.

Fig. 22 (b) to 22 (d) are enlarged views of the case where a film is used as the engaging portion 36, and will be described in order. Fig. 22 (b) shows a case where the curled portion 22 passes over the free end of the engaging portion 36 in the case where the paper lid 1 is assembled to the container 20. In this case, too, the space S1 formed by the curled portion 22, the top cover portion 2, and the engaging portion 36 can hold the content from the container 20, and thus leakage of the content from the paper lid 1 other than the drinking port 5 can be reduced. In fig. 22 (b), the paper material provided with a coating such as a film may be used as the engaging portion 36, and in this case, the shape of both ends of the engaging portion 36 may be bent at right angles, at acute angles, or at obtuse angles. This can further reduce the gap between the second tapered portion 11 and the end of the engagement portion 36. In particular, when the shape of both ends of the engaging portion 36 is an obtuse angle as shown in fig. 22 (b), the sealing property between the paper lid 1 and the container 20 can be further improved.

Fig. 22 (c) shows a case where the end of the engaging portion 36 is not a free end but is joined to the side surface of the second tapered portion 11. The center of the engaging portion 36 and the periphery thereof are joined to the top cover portion 2, and a portion not joined anywhere is formed between a portion joined to the top cover portion 2 and a portion joined to the side surface of the second tapered portion 11. When the paper cover 1 is assembled to the container 20, the curled portion 22 abuts against the portion which is not joined to any place, and the film forming the engaging portion 36 is elastically deformed toward the paper cover 1, whereby the paper cover 1 is fitted to the container 20. Therefore, even when the container 20 is tilted, the film forming the engaging portion 36 functions so that the content from the container 20 does not leak, and therefore, the content does not leak from the paper lid 1 other than the drinking port 5.

A space S1 is formed by the top cover 2, the second tapered portion 11, the engagement portion 36, and the curled portion 22. For example, even when the paper container 20 is strongly held by a hand and the container 20 is deformed, the space S1 follows the deformation or functions as a buffer, so that the paper cover 1 is not easily detached from the container 20.

Fig. 22 (d) shows a case where both ends of the engaging portion 36 are joined to the side surface of the second tapered portion 11, instead of joining the engaging portion 36 to the top cover portion 2. In this case, when the paper cover 1 is assembled to the container 20, the film forming the engaging portion 36 is elastically deformed toward the paper cover 1, and the paper cover 1 is fitted to the container 20. Therefore, even if the container 20 is tilted, the film forming the engaging portion 36 functions so that the content from the container 20 does not leak, and therefore, the content does not leak from the paper lid 1 other than the drinking port 5. The paper material provided with a coating such as a film may be used as the engaging portion 36, and in this case, it is preferable to form the engaging portion 36 in a solid shape and join the engaging portion 36 to the top cover portion 2. In some cases, the flatness of the top cover portion 2 may be deteriorated due to the manufacturing process, and leakage of the content from the top cover portion 2 and the curled portion 22 may occur due to the deterioration of the flatness of the top cover portion 2. Therefore, by engaging the curled portion 22 with the engaging portion 36 which maintains flatness, the risk of occurrence of the leakage can be reduced. The engaging portion 36 may be annular in shape.

The engagement of the engaging portion 36 may be performed by any of the various engagement methods described above. In addition, films other than polyethylene films may be used as the film. In addition, other materials such as paper materials, air laid members in which crushed pulp is laminated, and the like may be bonded to the film within a range in which the film is elastically deformable.

In fig. 22 (b) to 22 (d), the concave portion 35 and the convex portion 37 may be formed, or may be omitted. In the case of forming the recess 35, a part of the engaging portion 36 may be engaged with the recess 35.

In fig. 22 (a) to 22 (d), when the content of the container 20 is a hot beverage such as hot coffee, the pressure in the space enclosed by the paper lid 1 and the container 20 increases, and therefore, the adhesion of the film forming the engaging portion 36 increases. This improves the sealing between the paper lid 1 and the container 20.

Fig. 22 (e) to 22 (g) are modified examples of the case where a paper material provided with a coating such as a film is used as the engaging portion 36, and will be described in order. In fig. 22 (e), the end of the engaging portion 36 is formed into a shape substantially covering the outside of the curled portion 22 by press working. The contact surface between the recess 35 and the engagement portion 36 is engaged. The end of the engagement portion 36 may be a free end or may be engaged with the second tapered portion 11. When the end of the engaging portion 36 is a free end, the dimension of the end of the engaging portion 36 may be set so that the free end of the engaging portion 36 is bent upward by engagement with the curled portion 22.

When the bottom of the paper cup is used as the paper lid 1, a seam between the paper material and the paper material is formed inside the peripheral wall of the paper lid 1, and there is a fear that the content of the container 20 may leak from the seam. However, the end of the engaging portion 36 can be closed by pressing a part of the seam inside the peripheral wall of the paper cover 1. Accordingly, the leakage of the contents from the paper cover 1 along the seam can be prevented. Thus, even when the container 20 is tilted, the engaging portion 36 covers the outside of the curled portion 22, and therefore, the content does not leak from the paper lid 1 other than the drinking port 5. In addition, even when the container 20 is deformed by holding the paper container 20 with a hand, the space S1 formed by the top cover portion 2, the second tapered portion 11, the engaging portion 36, and the curled portion 22 causes the space S1 to follow the deformation due to the elasticity of the space S1 or to exert a cushioning function, so that the paper cover 1 is less likely to be detached from the container 20.

When the drinking opening 5 is formed in a certain portion of the seam on the inner side of the peripheral wall of the paper cover 1, the contents may leak out of the seam. Therefore, it is desirable that: the drinking opening 5 is provided at a position (a position where interference does not occur) different from the seam on the inner side of the peripheral wall of the paper cover 1.

When the engaging portion 36 in fig. 22 (e) is formed of a film, and the engaging portion 36 is engaged with the curled portion 22 by the elasticity of the film, the adhesion between the engaging portion 36 and the curled portion 22 is further improved.

In fig. 22 (f), the end portion of the engaging portion 36 including the convex portion 36a and the concave portion 36b is formed in a shape substantially covering the outside and the inside of the curled portion 22 by press working. As described above, if a part of the seam inside the peripheral wall of the paper lid 1 is pressed by the end of the engaging portion 36 to seal it, leakage of the content from the paper lid 1 along the seam can be prevented. Further, a part of the seam formed inside the peripheral wall of the container 20 can be pressed by the concave portion 36b of the engaging portion 36 to be sealed. Accordingly, the contents can be prevented from leaking from the paper cover 1 along the seam of the inner side of the peripheral wall of the container 20.

Thus, even when the container 2 is tilted, the engaging portion 36 covers the outside and the inside of the curled portion 22, and therefore, the content does not leak from the paper lid 1 other than the drinking port 5. The drinking port 5 may be provided at a portion where the recess 35 contacts the engaging portion 36.

Fig. 24 is a schematic view and a cross-sectional view showing an example of the engaging portion 36 in fig. 22 (f). As shown in fig. 24, the engaging portion 36 is circular, and includes a convex portion 36a as a first portion, a concave portion 36b as a second portion, and an opening 36c. The engaging portion 36 has an outer diameter larger than that of the bottom cover portion 4. Therefore, when the engaging portion 36 is fitted into the top cover portion 2, the end of the engaging portion 36 may be bent toward the container 20. This improves the sealing between the paper lid 1 and the container 20. In this way, when the outer diameter of the engaging portion 36 is made larger than the outer diameter of the bottom cover portion 4 and the engaging portion 36 is fitted into the top cover portion 2, the joining of the top cover portion 2 and the engaging portion 36 by heat sealing or the like may be omitted.

The thickness of the engaging portion 36 is about 0.7mm to 2.0mm, except for the convex portion 36a and the concave portion 36 b. By setting the thickness of the engaging portion 36 in this manner, the strength of the top cover portion 2 and the recess 35 can be improved, and the flatness of the top cover portion 2 and the recess 35 can be improved. Further, elasticity (elasticity) can be imparted to the convex portion 36a, and the convex portion 36a can follow the deformation of the curled portion 22. The protruding portion 36a has a semicircular shape so as to engage with the curled portion 22, but may have an inverted U shape or an inverted V shape. In the case where the convex portion 36a is engaged with the curled portion 22, the size of the convex portion 36a (the size of a semicircle or the like) may be smaller than the size (diameter) of the curled portion 22, and the curled portion 22 may be deformed to engage the curled portion 22 with the convex portion 36 a. The concave portion 36b may be linear.

The convex portion 36a and the concave portion 36b are formed by press working in the manner described above. The convex portion 36a is shaped to cover the outside of the curled portion 22, and the concave portion 36b is shaped to cover the outside of the curled portion 22. That is, the curled portion 22 is covered with the convex portion 36a and the concave portion 36 b. Note that, all the curled portions 22 may not be covered by the convex portions 36a and concave portions 36 b.

As described above, the engaging portion 36 is a paper material provided with a coating such as a film. The press working to form the convex portion 36a and the concave portion 36b may be performed in a state where the film is bonded, or the film may be stretched after the press working. When the film is stretched on the surface of the convex portion 36a facing the curled portion 22 after the convex portion 36a is formed, the convex portion 36a can be engaged with the outside of the curled portion 22 by the elasticity of the film.

The opening 36c is an alignment opening for engaging the engaging portion 36 with the recess 35, and the size thereof can be appropriately set. The opening 36c may be omitted, the outer periphery of the engaging portion 36 may be used to perform alignment for engagement with the recess 35, and a notch (notch) may be formed in the engaging portion 36 to perform alignment for engagement with the recess 35.

Fig. 22 (g) shows an example in which the convex portion 37 is omitted from fig. 22 (a), and a paper material having elasticity (cushioning property) is used as the paper material of the engaging portion 36. At least one surface (the surface facing the container 20) of the elastic paper material is provided with a coating such as a film. Various kinds of corrugated paper can be used as the paper material having elasticity. Corrugated paper is excellent in cushioning properties and rigidity due to corrugations, but its ends are weak in rigidity and easily elastically deformed. When corrugated paper is used as the engaging portion 36, the end portion thereof engages with the curled portion 22 and is elastically deformed, so that the sealing performance between the paper lid 1 and the container 20 can be improved.

The elastic paper material may be formed by laminating a paper material and foamed polyethylene, or may be formed by laminating an embossed flexible paper material or an air-laid material (japanese patent application No.). In this case, it is preferable to provide a coating such as a film or apply a water repellent to at least one surface (the surface facing the container 20) of the paper material. Further, a paper material having elasticity may be laminated between the paper materials. In addition, various nonwoven fabrics may be used instead of the paper material having elasticity.

It should be noted that, in the case of the air-laid member, the heat-sealed surface of the air-laid member may be made to be tight by heat-sealing with a film, not laminating with a paper material, by subjecting the heat-sealed surface of the air-laid member to a burn-proof treatment (Japanese: a box-over treatment). In this way, the engaging portion 36 may be constituted by a coating layer (waterproof layer) and an elastic layer.

Further, as the elastic paper material, a plurality of tissue papers may be stacked, and a coating layer may be provided on the stacked tissue papers.

The free end of the engagement portion 36 shown in fig. 22 (g) may be tapered, may be tapered in the same direction as the tapered portion 21, or may be tapered in a reverse direction different from the tapered portion 21.

The free end of the engaging portion 36 may be folded upward (toward the space S1) by engagement with the curled portion 22, so that the size of the end of the engaging portion 36 may be set.

Further, the second tapered portion 11 and the end of the engagement portion 36 may be spaced apart by a distance smaller than the size of the curled portion 22, and the curled portion 22 may be deformed to engage the curled portion 22 between the second tapered portion 11 and the end of the engagement portion 36.

In fig. 22 (e) to 22 (g), the second tapered portion 11 may be provided with the convex portion 37, or the concave portion 35 may be omitted. In the examples of fig. 22 (c), 22 (e) and 22 (f), when the second tapered portion 11 is provided with the convex portion 37, it is desirable that: the end of the engaging portion 36 has a shape covering the protruding portion 37. Thereby, the content of the container 20 is less likely to leak from the paper lid 1.

In fig. 22 (a) to 22 (g), if the taper angle of the second tapered portion 11 is made to be an acute angle smaller than the taper angle of the tapered portion 21 of the container 20, the volume of the space S1 can be made larger. Thus, even when the container 20 is deformed, the paper cover 1 is not easily detached from the container 20.

Instead of the engaging portion 36, an elastic member may be provided on the curled portion 22 side of the top cover portion 2 or on the inner peripheral surface of the second tapered portion 11 so as to engage with the curled portion 22. As the elastic member, a film, rubber, foamed polyethylene, polyurethane, silicon, hot melt adhesive, or the like can be used.

Fig. 27 shows another example of a cross-sectional view of the paper cover 1 of the eighth embodiment, showing two examples of fig. 27 (a) and 27 (b), which are also sequentially described. In both examples, the recess 35 and the engagement portion 36 are omitted, but the recess 35 and the engagement portion 36 may be provided.

Fig. 27 (a) shows an example in which the curled portion 22 is fitted by a circumferential convex portion 37 provided on the inner periphery of the second tapered portion 11. In this case, by making the inner diameter of the tip of the convex portion 37 into which the curled portion 22 enters smaller than the outer diameter of the curled portion 22, at least one of the curled portion 22 and the convex portion 37 can be deformed to fit the curled portion 22 and the convex portion 37, and thus the sealing property between the paper lid 1 and the container 20 can be improved.

In fig. 27 (b), the second tapered portion 11 is formed by a plurality of taper angles having different angles. As an example, the taper angle of the strong taper portion 11a is 5 °, and the taper angle is enhanced (made larger) as compared with the weak taper portion 11b described later. The weak tapered portion 11b is provided on the container 20 side (curled portion 22 side) of the strong tapered portion 11a, and as an example, the taper angle thereof is 3 °, and the taper angle is reduced (made smaller) as compared with the strong tapered portion 11 a. In this way, by weakening (reducing) the taper angle of the container 20 side (the curl portion 22 side), the curl portion 22 easily enters the paper cover 1.

In fig. 27 a and 27 b, the dimension in the Z direction (height direction) of the protruding portion 37 is equal to or greater than half the diameter of the curled portion 22, preferably equal to or greater than the diameter of the curled portion 22, whereby the sealing property between the paper lid 1 and the container 20 can be improved.

Fig. 23 is a cross-sectional view showing the sealing portion 8 of the paper cover 1 according to the eighth embodiment, and shows three examples of fig. 23 (a) to 23 (c), and a description will be given below in order. As the paper cover 1, a paper cover 1 other than the eighth embodiment may be used.

Fig. 23 (a) shows the sealing portion 8 for sealing the drinking opening 5 formed in the recess 35 of the top cover portion 2. A view of the drinking spout 5 from above is shown below. The drinking opening 5 is the same as the shape shown in fig. 2 (c), and is opened in the direction of the arrow of the paper cover 1 by adding a notch to the recess 35. The sealing portion 8 is sized to cover the drinking opening 5, but may be sized to cover a portion of the drinking opening 5. Since the drinking port 5 is not easily visually checked, letters or drawings indicating the location of the drinking port 5 may be printed on the sealing portion 8.

The sealing portion 8 has an inverted C shape, and the lower surface of the sealing portion 8 is bonded to the recess 35 by an adhesive 13 provided in correspondence with the upper surface of the drinking spout 5. The tip of the free end of the seal portion 8 extends upward to form a pinch portion of the seal portion 8.

The releasable adhesive 14 is applied in a dispersed manner to the surface opposite to the lower surface of the sealing portion 8 to which the adhesive 13 is applied. The releasable adhesive 14 may be applied in a spot, a spiral, or a continuous manner. When the handle portion is pulled in the direction indicated by the arrow in fig. 23 (a), the portion of the drinking spout 5 where the notch is not formed functions as a hinge, and the drinking spout 5 opens. When the sealing portion 8 is pulled in the arrow direction, the sealing portion 8 is changed from an inverted C shape to a linear shape, and the releasable adhesive 14 is opposed to the concave portion 35. In this state, the removable adhesive 14 is pressed against the concave portion 35, whereby the opening state of the drinking spout 5 can be maintained.

In fig. 23 (b), the removable adhesive 14 is applied at a position different from that in fig. 23 (a), and the removable adhesive 14 is applied to the back surface of the inverted C-shaped upper part. When the handle portion is pulled in the direction indicated by the arrow in fig. 23 (b), the drinking opening 5 is opened, the sealing portion 8 is changed from an inverted C shape to a straight shape, and the releasable adhesive 14 is opposed to the concave portion 35. In this state, the removable adhesive 14 is pressed against the concave portion 35, whereby the opening state of the drinking spout 5 can be maintained.

In fig. 23 (c), the sealing portion 8 is linear, and the adhesive 13 and the releasable adhesive 14 are applied to the lower surface of the sealing portion 8, which is the surface facing the recess 35. The adhesive 13 corresponds to the upper surface of the drinking port 5. In this case, the releasable adhesive 14 may be applied so as to be joined to the concave portion 35, or may be applied so as not to be joined to the concave portion 35. When the releasable adhesive 14 is bonded to the recess 35, it is preferable to attach a release paper to the recess 35 bonded to the releasable adhesive 14 or to apply a release agent such as silicon or teflon (registered trademark) to the recess 35. It is preferable that the release paper is provided so as not to interfere with at least a part of the adhesive 13 (the drinking port 5 side).

After the handle is pulled in the direction indicated by the arrow in fig. 23 (c) to open the drinking port 5, the releasable adhesive 14 is pressed against the recess 35, whereby the opening state of the drinking port 5 can be maintained.

In the present embodiment, the adhesive force of the adhesive 13 is larger than the adhesive force of the adhesive 14. Instead of, or in addition to, the adhesive 13 is preferably applied in an amount greater than the adhesive 14. The lower surface of the sealing portion 8 and the concave portion 35 may be joined by heat sealing instead of the adhesive 13. Further, the sealing portion 8 may be formed in a zigzag shape. Further, the flat top cover portion 2 may be used without forming the concave portion 35.

In the drinking port 5 shown in fig. 2 and 23, the diameter of the drinking port 5 may be about 6mm to 14mm in the case of a circular shape, and the length of the diagonal line may be about 9mm to 20mm in the case of a rectangular shape. Thus, larger ice does not pass through the drinking opening 5, and children are prevented from eating larger ice by mistake.

(method for producing paper cover 1 of FIG. 27 (a))

Fig. 28 is a flowchart showing an example of a method of manufacturing the paper cover 1, and fig. 29 is a schematic diagram of a method of manufacturing the paper cover 1. A method of manufacturing the paper cover 1 will be described below. Here, a method of manufacturing the paper cover 1 shown in fig. 27 (a) will be described as an example.

The material forming the tapered portion 3 of the paper cover 1 (referred to as a fan-shaped coated paper material) is molded into a fan shape as shown in fig. 26, and printing of the display portion 40 is performed in this state (step S1). The printing may be performed before the display portion 40 is molded into a fan shape. The display portion 40 may be printed on a paper material or may be printed on a film as a coating layer. The number of display units 40 is not limited to three. The ideal is: next, the display portion 40 is printed, and the slit of the slit portion 41 is formed.

The fan-shaped coated paper material is transported to a first processing station 61. At the first processing station 61, the fan-shaped coated paper material overlaps the two ends of the fan-shaped by a portion and is joined by, for example, ultrasonic joining. Thereby, the tapered portion 3 is formed (step S2). In this case, the taper portion 3 is formed using a mold that molds the taper portion 3. The portion where the overlapping portions are formed as a seam.

Further, the lower edge of the fan-shaped coated paper material is bent inward by press working, thereby forming the second tapered portion 11. The upper side of the fan-shaped coated paper material serves as a peripheral wall surrounding the curled portion 9 and the top cover portion 2, and these will be described later.

The fan-shaped coated paper material after the end of the processing performed at the first processing station 61 is transported to the fourth processing station 64. Before the processing performed at the fourth processing station 64 is described, a method of manufacturing the top cover portion 2 will be described.

The blank roll 60 is a coated paper material for use in the formation of the cover dome section 2. As shown in fig. 29, the upper and lower ends of the blank roll 60 are wave-shaped. The following description will be given of the waveform.

Fig. 30 is a diagram showing a method of pulling out (i.e., pulling out in japanese) the cover part 2 from the blank roll 60 a. Here, the two rows of top cover portions 2 are drawn from the blank roll 60 a. As shown in fig. 30 (a), when the top cover 2 is pulled out with the vertical positions of the first and second rows being the same, the portion shown by the black coating is discarded after the top cover 2 is pulled out.

In contrast, as shown in fig. 30 (b), when the top cover part 2 is pulled out with the vertical positions of the first row and the second row of the top cover part 2 shifted, the amount of wasted blackened parts decreases. Further, since the width w of the blank roll 60a is not used, the width of the blank roll 60a of the width w can be saved, the blank roll 60a can be used efficiently, and the manufacturing cost of the paper cover 1 can be reduced. It is preferable that the vertical shift amount between the first row and the second row of the top cover portion 2 is about the radius of the top cover portion 2. In fig. 30, two rows of top cover portions 2 are drawn from the blank roll 60a, but three or more rows of top cover portions 2 may be drawn according to the width of the blank roll 60 a.

In the present embodiment, since three or more rows are drawn from one blank roll 60a by the method of fig. 30 b, the upper and lower ends of the blank roll (blank roll 60 shown in fig. 29) of 1 row amount are wavy, but at least one of the upper and lower ends may be linear. For example, in the case where two rows of the cover portions 2 are taken out from 1 blank roll 60a by the method of fig. 30 (b), the upper end or the lower end of the blank roll 60 is linear. Note that, the blank roll 60a of fig. 30 (a) may be used, and in this case, one of the upper end and the lower end is in a wave shape, and the other of the upper end and the lower end is in a straight line shape. Note that, when the blank roll 60a in fig. 30 (a) is a 1-row blank roll, both the upper end and the lower end may be linear, and such a blank roll may be used.

Returning to fig. 29, the blank roll 60 is transported to a second processing station 62. At the second processing station 62, the seal 8 as shown in fig. 23 is joined to the blank roll 60. In the second processing station 62, the number of sealing portions 8 may be one or three or more, although two sealing portions 8 are illustrated. The sealing portion 8 is conveyed from a sealing blank roll, not shown, and during the conveyance thereof, the protective release paper is removed and the adhesive surface is joined to the blank roll 60. A release paper different from the protective release paper may be provided at the portion of the adhesive 14 to be bonded in fig. 29, and the adhesive force of the adhesive 14 may be weaker than the adhesive force of the adhesive 13.

The blank roll 60 with the seal 8 engaged is transported to a third processing station 63. In the third processing station 63, processing for forming the drinking orifice 5 is performed using a cutter. In the third processing station 63, the top cover portion 2 is drawn using a cutter. The drink opening 5 is processed using the seal 8 joined to the blank roll 60 as a mark.

The top cover part 2 is drawn out in a manner shown by a circular dotted line. The outer periphery of the top cover part 2 is bent by press working so that the top cover part 2 is joined between the tapered part 3 and the second tapered part 11 having a U-shaped cross section (step S3). The processing of the drinking port 5 and the processing of the top cover portion 2 may be performed either one at a time or simultaneously.

In addition, the layout of the second processing station 62 and the third processing station 63 may be replaced, and the processing of the third processing station 63 may be performed before the processing of the second processing station 62. In this case, the sealing portion 8 is joined to the top cover portion 2 with the drinking spout 5 as a mark.

In the present embodiment, the top cover portion 2 after the completion of the processing performed at the third processing station 63 is conveyed to the fourth processing station 64.

In the fourth processing station 64, the top cover portion 2, the outer periphery of which is bent by press processing, is fitted between the tapered portion 3 and the second tapered portion 11, each having a U-shaped cross section. The heat treatment is performed in a state where the top cover portion 2 is fitted between the tapered portion 3 and the second tapered portion 11 (step S4). By this heat treatment, the films applied to the top cover portion 2, the tapered portion 3, and the second tapered portion 11 melt, and the top cover portion 2, the tapered portion 3, and the second tapered portion 11 are heat-sealed and bonded. Further, a peripheral wall surrounding the top cover portion 2 is formed by the tapered portion 3. In the above description, the second tapered portion 11 is formed by pressing the lower edge of the fan-shaped coated paper material in step S2, and the outer periphery of the top cover portion 2 is pressed and bent in step S3, but the present invention is not limited thereto. For example, at least one of the press working may be performed immediately before the heat treatment in step S4 or simultaneously with the heat treatment.

In the case where the top cover portion 2, the tapered portion 3, and the second tapered portion 11 are heat-sealed, it is preferable that the drinking opening 5 avoid a seam formed in the tapered portion 3 (also referred to as a peripheral wall surrounding the top cover portion). Therefore, it is desirable that: the heat sealing is performed after detecting a mark provided at or near the seam by a detecting device not shown, and adjusting the position of the drinking spout 5 by rotating the top cover 2 based on the detection result.

The drinking opening 5 may be formed after the top cover portion 2 is joined to the tapered portion 3 and the second tapered portion 11. The sealing portion 8 may be formed after the drinking opening 5 is formed, or the sealing portion 8 may be formed in a subsequent process.

By pressing the inner peripheral surface of the second tapered portion 11 with a partially recessed block member, a portion that is not pressed by the recessed portion of the block member is formed as a convex portion 37 (step S5). The protruding portion 37 is formed at the upper end portion of the second tapered portion 11, but the position in the height direction thereof can be appropriately adjusted by the shape of the block member. Further, by adjusting the pressure of the pressing block member, the height of the convex portion 37 can be adjusted. The height of the protruding portion 37 may be adjusted according to the weight per unit area of the second tapered portion 11. After the convex portion 37 is formed, the heat-sealed and joined top cover portion 2, tapered portion 3, and second tapered portion 11 are conveyed to the fifth processing station 65.

Next, at the fifth processing station 65, the curled portion 9 is formed by the curl forming die 70 shown in fig. 11 (step S6). Thereby, the paper cover 1 of fig. 27 (a) can be manufactured. The above-described manufacturing method is an example, and variations such as the order of replacing a part of the steps may be performed.

The paper cover 1 can also provide another effect for improving the heat insulating property of the content in the container 20. The improvement of the heat insulation property obtained by the paper cover 1 of the fifth embodiment will be described below.

Fig. 18 is a diagram showing an example of the engagement between the top cover portion 2 and the engaging portion 12 of the paper cover 1 in fig. 9 (a). Fig. 18 a shows an example of bonding in which an adhesive 25 is applied to the entire surface of the top cover portion 2a (see fig. 10) of the engaging portion 12 and the top cover portion 2, and the space 26 is not provided between the top cover portion 2 and the top cover portion 2 a. Fig. 18 b shows an example of bonding in which an adhesive 25 is applied to the center portion of the top cover portion 2a (see fig. 10) of the engaging portion 12 and the top cover portion 2, and a space portion 26 is provided. Fig. 18 c shows an example of bonding by applying an adhesive 25 to the outer periphery of the top cover 2a (see fig. 10) of the engaging portion 12 and the top cover 2, and there is a space 26.

150cc of 75℃water (content) was poured into the 5 oz container 20, and a thermal insulation test was performed for measuring the temperature of the water (content) for each elapsed time in a state where the paper lid 1 was inserted. Further, tests were conducted in both a state where the drinking port 5 was closed and a state where the drinking port 5 was opened.

Further, as a comparative example, measurement was performed using a plastic cap that is currently used. The plastic cover is not of a type that joins the top cover part 2 and the engaging part 12, and therefore there is no adhesive portion.

TABLE 1

As shown in table 1, the thermal insulation performance of the paper cover 1 was not only inferior to that of the plastic cover used at present, but also the thermal insulation performance of the test example in which the adhesive 25 was coated on the center portion and the test example in which the adhesive 25 was coated on the outer periphery was superior to that of the plastic cover by 1 to 2 ℃. This is because of the adiabatic effect of the space 26. In this way, the heat-insulating effect can be confirmed in the environment-friendly paper cover 1. The joining of the cover portion 2 and the engaging portion 12 is not limited to the bonding, and any joining method may be used as long as the space portion 26 can be formed.

The above-described embodiments are preferred examples of the present invention. However, the present invention is not limited to this, and the above embodiments may be appropriately combined, and a part of the constitution may be omitted. Further, a part of the structure may be deformed, and for example, a notch may be added to the curled portion 9 to weaken the rigidity of the curled portion 9. The container 20 may be inserted from the outside using the curl portion 9 provided with the slit. Further, although it is disclosed that a part of the press working machine is heated at the time of press working, a part of the ultrasonic joining device (for example, a part holding the paper cover 1) may be heated to about 50 ℃ to 85 ℃ at the time of ultrasonic joining. In this way, when the paper cover 1 is heated to manufacture, even when the content of the container 20 is a hot beverage (60 to 100 ℃), the paper cover 1 is less likely to be deformed into a shape before press working, and thus the risk of the paper cover 1 coming off the container 20 can be reduced.

At least one member of the engaging portion 12, the base portion 12a, the engaging portion 12b, the curled portion 29, and the engaging portion 36 may be an air-flow type pulp in which pulverized pulp is laminated. In this case, the air-laid member had a weight per unit area of 20g/m ² To 100g/m ² Preferably 40g/m ² To 60g/m ² And (3) obtaining the product. Furthermore, it is desirable that: films (e.g., polyethylene films) are laminated on both sides of the airlaid and joined by ultrasonic bonding. By using an airlaid, it can function as a cushioning member or seal.

In this way, various modifications can be made without departing from the spirit of the invention.

Claims

1. A paper cover, comprising:

a cover main body part with paper material, which is assembled on a container with an opening part, a cone shape and a curled part;

a top cover part, the outer periphery of which is surrounded by the cover main body part;

an engagement portion provided in the lid body portion and having a tapered portion formed in the same direction as the tapered direction of the container, the engagement portion being engaged with the curled portion of the container from the outside of the curled portion of the container; and

a cover main body portion side curled portion provided on the cover main body portion and located above the engagement portion,

The cover main body portion is formed in a tapered shape tapering from an upper end toward a lower end,

the outer periphery of the top cover part is bent toward the side opposite to the side curled part of the cover main body part, the bent part is jointed with the cover main body part,

the engagement portion is formed by an inner taper portion formed by bending a lower end of the cover main body portion toward a bent outer peripheral side of the top cover portion,

the inner diameter of the lower end of the engaging portion is sized to be slightly smaller than the outer diameter of the curled portion of the container,

in a state where the opening of the container is closed, the curled portion of the container is in contact with the tapered surface of the inner tapered portion of the engaging portion.

2. The paper cover according to claim 1, wherein,

the top cover part is provided with a drinking opening.

3. The paper cover of claim 2, wherein,

a seam between the paper material and the paper material is formed in the cover main body,

the drinking spout is positioned so as not to interfere with the seam.

4. The paper cover according to claim 1, wherein,

the cover main body is provided with a peripheral wall part connected with the cover main body side curled part,

The peripheral wall portion is formed with a display portion for displaying contents of the container.

5. The paper cover according to claim 4, wherein,

the lid main body portion side curled portion is deformable,

the content is discriminated from the plurality of displays based on the deformation of the lid main body portion side curled portion.

6. The paper cover according to claim 1, wherein,

the engagement portion deforms the curled portion of the container to engage with the curled portion.

7. The paper cover according to claim 1, wherein,

the cover main body portion side curled portion is different in size from the curled portion of the container.

8. The paper cover according to claim 1, wherein,

the top cover portion is provided with a visual confirmation portion capable of visually confirming the interior of the container.

9. The paper cover of claim 2, wherein,

the drinking port is joined with a seal portion having a 1 st joint portion joined with the drinking port and a knob portion capable of opening the drinking port.

10. The paper cover according to claim 9, wherein,

the sealing portion has a 2 nd engagement portion with the cover portion,

The engagement force of the 1 st engagement portion is greater than the engagement force of the 2 nd engagement portion.

11. The paper cover according to claim 1, wherein,

the height from the cover main body portion side curled portion to the top cover portion is 36% -53% of the height of the cover main body portion.

12. The paper cover according to claim 1, wherein,

the engagement portion includes a circumferential protruding portion.

13. The paper cover according to claim 1, wherein,

the paper material of the cover main body portion is covered with a biodegradable film.

14. The paper cover according to claim 1, wherein,

the height of the lid main body portion from the lid main body portion side curled portion to the top lid portion is 3.5mm to 12mm.