CN111196055A

CN111196055A - Paper cover

Info

Publication number: CN111196055A
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: 2020-05-26
Anticipated expiration: 2039-01-31
Also published as: CN111196056A; CN111196055B; CN111196056B

Abstract

The invention aims to provide a paper cover with good use convenience. The paper cover is provided with: a main body portion 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 and a taper.

Description

Paper cover

The present invention is a divisional application of an invention application having an application date of 2019, 31.01.9, an application number of 201910100479.9, and an invention name of "a paper cover and a method for manufacturing a paper cover".

Technical Field

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

Background

Paper cups are used as containers for various beverages such as coffee and black tea. The lid was closed so that the liquid of the contents did not leak from the paper cup. Most of the cover is made of plastic, which is not in line with the recent trend of reducing plastic and using environment-friendly products. Further, it is proposed to use the bottom portion of the paper cup as a paper cover, but the convenience of use is not considered (patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication 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 right tapered, and when the paper cup is tilted, the contents may leak, and the usability is insufficient. Further, patent document 1 only has been proposed for paper covers, and has not been studied in detail, and is insufficient in usability.

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

Technical scheme

In order to solve the above problems, a 1 st aspect of the present invention provides a paper cover comprising: a lid body portion having a paper material and mounted on a container having an opening portion, a tapered shape, and a curl portion; a first engaging portion provided in the lid main body portion, having a taper shape in the same direction as the direction of the taper shape, and engaging with the curl portion from an outer side of the curl portion; and a body-side curled portion provided on the lid body and located above the first engaging portion.

A 2 nd aspect of the present invention provides a method of manufacturing a paper cover, including: providing a drinking spout portion and a sealing portion joined to the drinking spout portion on a top lid portion using a paper material; and a step of joining the top lid portion formed with the drinking spout portion 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 of manufacturing a paper cover to be attached to a container having an opening, a tapered shape, and a curl portion, the method including: forming an engaging portion for deforming and engaging the curl portion using a fan-shaped paper material; and a step of joining the top cover portion to the engaging portion.

Advantageous effects

In the paper lid according to claim 1, the paper lid can be improved in sealing property and usability.

In the method of manufacturing a paper-made lid according to claim 2, since the lid portion formed with the drinking spout and the sealing portion is joined to the tapered portion having a tapered shape and made of a paper material, a paper-made lid excellent in usability can be manufactured.

In the method of manufacturing a paper cover according to claim 3, since the top lid 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 sectional view of a paper lid and a container of the first embodiment.

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

Fig. 3 is a reference view showing a plastic cap.

Fig. 4 is a sectional view of the paper cover and the 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 paper cover is provided with a handle and a bracket.

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

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

Fig. 10 is a diagram illustrating a method of manufacturing a paper cover according to a sixth embodiment.

Fig. 11 is a diagram illustrating a method of manufacturing a paper cover according to a sixth embodiment.

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

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

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

Fig. 15 is a 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 sectional view of a paper cover of the seventh embodiment.

Fig. 18 is a diagram showing an example of joining of the cap portion and the engaging portion.

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

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

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

Fig. 22 is a sectional view of a paper cover of the eighth embodiment.

Fig. 23 is a sectional view showing a seal portion of a paper-made lid according to the eighth embodiment.

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

3 fig. 3 25 3 is 3a 3 schematic 3 view 3, 3a 3 partially 3 enlarged 3

view

3, 3 and 3 an 3a 3- 3a 3 sectional 3 view 3 of 3 the 3 display 3 portion 3 40 3 of 3 the 3 paper 3- 3 made 3 lid 31 3. 3

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

Fig. 27 is a sectional view of a paper cover of the eighth embodiment.

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

Fig. 29 is a schematic diagram of a method of manufacturing a paper cover.

Fig. 30 is a diagram showing a method of drawing out the lid member from the blank roll.

Description of the symbols

1 cover unit

2 Top cover part

3 taper part

5 Drinking port

6 groove part

8 sealing part

9 crimping part

10 mark

20 container

21 taper part

22 crimping part

30 support

31 hinge

Detailed Description

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

(first embodiment)

Fig. 1 is a sectional view of a paper-made lid 1 and a container 20 according to a first embodiment, fig. 1(a) is a sectional view showing a state where the paper-made lid 1 is removed from the container 20, and fig. 1(b) is a sectional view showing a state where the paper-made lid 1 is fitted to the container 20.

Fig. 2 is a schematic view of the paper-made lid 1 according to the first embodiment as viewed from above, fig. 2(a) is a view showing a state in which the sealing portion 8 seals the drinking hole 5, and fig. 2(b) is a view showing a state in which the sealing portion 8 is detached from the drinking hole 5. Fig. 2(c) and 2(d) are views in which the drinking hole 5 is bent toward the center of the paper lid 1, and the solid lines are cuts.

(paper cover)

The paper-made lid 1 has: a top lid part 2, a tapered part 3 formed on the top lid part 2, a bottom lid part 4, a drinking spout 5, a groove part 6, an air hole part 7, and a sealing part 8.

The paper-made lid 1 is inserted into 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. Further, a paper material formed by papermaking may also be used.

In addition, as the paper material, various water-resistant papers may be used, and a coating layer may be provided on at least the container side surface of the paper material. As the coating layer, a film or a coating agent can be used. Examples of the film include: 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. As the film, preferred are: a biodegradable film such as polylactic acid is used.

In the case of using a coating agent, a coating agent having no influence on the human body, such as plant starch, may be used. In the present embodiment, the bottom portion of the paper cup can be used as the paper cover 1.

The lid dome section 2 has a step (recess) with a depth of about 3mm to 12mm formed on the lower side (container 20 side), and a tapered section 3 formed on the side surface. The tapered portion 3 is tapered (reverse tapered) in the opposite direction 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 of the tapered portion 3 in the height direction (Z direction in fig. 1) is larger than the dimension of a curled portion 22 of a container 20 described later in the height direction. Thus, when the paper-made lid 1 is inserted into the container 20, even if the container 20 is laid down, the possibility of the content of the container 20 overflowing can be reduced.

In the case where the

tapered portions

3 and 21 are reverse tapered, the force of fitting is point contact (line contact) rather than surface contact, and therefore the force at the time of fitting acts on the fitting portions more intensively than in the case of surface contact. Therefore, the fitting property between the tapered portion 3 and the tapered portion 21 is improved, and the sealing property of the paper-made lid 1 is improved. Since the tapered portion 3 and the tapered portion 21 are made of paper material, the tapered portion 3 and the tapered portion 21 are deformed by fitting to form several flat surface portions. The flat surface portion improves the fitting property of the tapered portion 3 and the tapered portion 21. Further, the above-described effects can be obtained even if the tapered portion 3 is linear 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-made lid 1, the tapered portion 3 may be provided with a concave-convex portion or a stepped portion.

The bottom lid portion 4 is shaped to engage with the top lid portion 2. The bottom lid portion 4 and the top lid portion 2 can be engaged with each other by: various methods such as press working, ultrasonic bonding, heat sealing, and adhesives (e.g., starch paste).

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

As shown in fig. 2(c) and 2(d), the drinking spout 5 has a cut line of a solid line and a portion where the cut line is not formed, and the portion where the cut line is not formed functions as a hinge. The drinking spout 5 is opened by bending the solid-line incision toward the center of the paper lid 1. In this case, the drinking hole 5 can be easily bent by providing the bottom lid 4 with an opening corresponding to the notch by adding the notch to the top lid 2. Further, if the cut line is formed in a V shape (inverted triangle shape) by cutting from the top lid portion 2 side to the bottom lid portion 4, the content from the container 20 is less likely to leak to the top lid portion 2 side in a state where the drinking spout 5 is closed. The drinking spout 5 may be in the form of a straight line, a curved line, or a combination of a straight line and a curved line, and may be in the form of a knob as shown in fig. 2 (d).

Further, when the curled portion 9 is expanded outward in correspondence with the drinking hole 5 as shown in fig. 2(c), or the outer ring of the curled portion 9 is crushed inward as shown in fig. 2(d), the contents from the drinking hole 5 can be easily drunk. Instead of the outer ring of the curl portion 9 shown in fig. 2(d), the inner ring may be crushed outward. As shown in the partially enlarged view of fig. 2(d), a connection portion 5a having no notch formed therein 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 can be considered that the drinking spout 5 is not opened. On the contrary, if the connecting portion 5a is not present, it is considered that the drinking hole 5 is opened. In association with this, the coupling portion 5a can recognize whether or not the drink opening 5 is mischievous. The position and the number of the connecting portions 5a can be arbitrarily set. The connection portion 5a may be formed in the drinking spout 5 shown in fig. 2(a) to 2 (c).

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

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

As shown in fig. 2(c) and 2(d), the groove portion 6 may be provided from the drinking hole 5 to the curled portion 9. The groove 6 may be formed to reach the edge or may be formed to reach the edge. The groove portion 6 shown in fig. 2(c) and 2(d) guides the content from the drink opening 5 to the user's mouth, and when the user releases the mouth from the drink opening 5, the content remaining near the drink opening 5 can be returned to the drink opening 5. Although 3 grooves 6 are shown in fig. 2(c) and 2(d), the number thereof may be any number or may be omitted.

A label indicating the contents may be attached to or printed on the top lid portion 2, or a label of a human or animal face may be attached to or printed on the top lid portion. In this case, when the drinking opening 5 is made to correspond to a mouth of a human or a mouth of an animal, a user can enjoy a fun like kissing when eating the contents. Alternatively, half of the face may be printed on the tapered portion 3, and the remaining part of the face may be printed on the tapered portion 21 of the container 20, so that the printed face can be visually confirmed when the paper cover 1 is properly attached.

3 fig. 3 25 3 is 3a 3 schematic 3 view 3, 3a 3 partially 3 enlarged 3

view

3, 3 and 3 an 3a 3- 3a 3 sectional 3 view 3 of 3 the 3 display 3 portion 3 40 3 of 3 the 3 paper 3- 3 made 3 lid 31 3. 3 In the partially enlarged view, the inside and outside of the peripheral wall of the paper cover 1 are shown in a spread state for easy understanding.

The display unit 40 is a member for recognizing the contents of the container 20 by printing characters, symbols, patterns, figures, and the like. As described above, since the paper cover 1 uses the paper material, printing can be easily performed. The display unit 40 may recognize whether the contents are hot or cold by printing the background color. For example, a hot beverage may be identified with the background color set to the color of the red color family, and a cold beverage may be identified with the background color set to the color of the water color family. Further, the contents can be associated with the background color. For example, the background color may be a black color in the case of black coffee, an orange color in the case of orange juice, or a white color in the case of milk. When the background color is a black color, the characters, symbols, patterns, figures, and the like may be white.

As shown in the partially enlarged view, the display unit 40 includes: an outer display 40a printed so as to correspond to the outside 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 inner 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 lid portion 2, extends to the curl portion 9, and is connected to the curl portion 9.

The outer display unit 40a prints a plurality of content candidates as characters outside the peripheral wall of the paper cover 1 so that the content can be recognized mainly on the side where the content is provided. For example, mocha coffee, black coffee, and the like. Note that, when the number of characters or the like is limited by the space of the peripheral wall of the paper cover 1, printing may be abbreviated, and in the case of cappucino, printing may be CAPP or the like.

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 content providing side can confirm the content of the container 20 from among a plurality of candidates of the content, and deform the curl display portion 40b associated with the outer display portion 40a of the content of the container 20, thereby enabling another person (for example, a user or a clerk other than the user) to recognize the content. Since the curl portion 9 is easily deformed by being pressed or bent with a finger, others can recognize the contents 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 by a plurality of curves, and the shape of the curve is deformed by pressing from above, which is different from the curve that is not pressed. Therefore, the other person can recognize the contents by the deformation of the curl portion 9 and the deformation of the print. In addition, when the curl display portion 40b is formed as characters, the curl portion 9 is deformed into a flat shape by pressing from above, and therefore, the printed characters look large and can be recognized by the size different from that of characters 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, the curl portion 22 or the peripheral wall of the paper cover 1 may be provided with a notch in advance.

Further, the deformation may be performed such that the curled portion 9 or the peripheral wall is perforated by a perforating tool or the like. When the rule that the curl portion 9 is deformed to identify the content is determined, the printing of the curl display portion 40b may be omitted.

By physically deforming the curl portion 9 in this manner, the content can be identified.

The inside display unit 40c mainly prints a plurality of content candidates as characters inside the peripheral wall of the paper cover 1 so that the user can recognize the contents. Therefore, it is preferable that the inner display portion 40c is provided at a position where the user can visually confirm from the drinking spout 5 together with the curl display portion 40 b. Specifically, when the drinking hole 5 is positioned on the lower side, the inner display portion 40c is preferably provided on the upper right (first quadrant) or upper left (second quadrant) of the paper lid 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 only needs to be provided so that the content can be recognized on the side where the content is provided, and therefore, can be provided independently of the inner display portion 40c and can be provided at any position outside the peripheral wall of the paper-made cover 1. From the viewpoint of easy printing, the display portion 40 including the curl display portion 40b is preferably printed before the curl portion 9 is formed.

The display unit 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 outer display portion 40a or the inner 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 curl portion 9 and a part of the peripheral wall of the paper-made cover 1 are physically deformed, the cuts may be provided in the curl portion 9 or the peripheral wall of the paper-made cover 1 as described above. Fig. 26 is a developed view of the paper cover 1 with the top cover portion 2 removed, and shows an example in which a cutaway groove portion 41 is formed in the periphery of the display portion 40. As shown in fig. 26, the paper cover 1 from which the top lid part 2 is removed is fan-shaped, the left and right ends are joined, and the curl forming region 9a of the upper end is curled to form the curl 9. Then, by being engaged with the top lid portion 2 of another member, the paper-made lid 1 is formed. Further, the joined portions of the left and right ends form a joint, and the content from the container 20 is likely to leak from the joint. The means for preventing leakage from the joint will be described in detail later.

Since the tip of the curl portion forming region 9a is wound into the curl portion 9, it cannot be visually confirmed even if printing for the curl display portion 40b is performed. Therefore, the tip of the curl portion forming region 9a may not be printed for the curl display portion 40 b. Further, the curl formation region 9a requires rigidity for forming a curl, which does not correspond to the formation of the notch portion 41 in the curl formation region 9a before the curl 9 is formed. Therefore, it is preferable that the notch portion 41 is provided outside 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 bent inward or outward.

In view of ease of manufacturing, it is preferable to form the notch 41 after printing the display unit 40, but the present invention is not limited thereto. Further, the notch portion 41 may be formed after the curl portion 9 is formed. The notch 41 may be formed in a half-cut shape, may be formed discontinuously, or may be provided only on one side of the display 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 confirmed by folding, it is not necessary to print the outer display unit 40a and the inner display unit 40c in the same orientation in reverse as shown in the partially enlarged view of fig. 25.

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

Preferably, the notch portion 41 is formed so as not to reach the lid portion 2. This is to prevent the content from the container 20 from leaking from the cutaway groove portion 41. Further, instead of bending the notch portion 41, the curl portion 9 formed with the notch portion 41 may be deformed by pressing to be associated with the display of the display portion 40 to visually confirm the contents. Further, as described above, since the curl portion 9 is deformed into a flat shape by pressing from above, the visibility of characters, marks, figures, and the like printed on the curl display portion 40b is improved.

Regarding the size of the drinking opening 5, when one example is given from the viewpoint of convenience of drinking, the width W1 is 10mm to 25mm, preferably 15mm to 22mm, and the length L1 is 10mm to 25mm, preferably 14mm to 21 mm. Further, when the drinking opening 5 is located at the outer peripheral end (peripheral wall portion) of the lid top 5, it is difficult to drink, and therefore, the length L2 from the outer peripheral end (peripheral wall portion) to the drinking opening 5 is 1mm to 15mm, preferably 4mm to 12 mm. When the content of the container 20 is a hot beverage, if the length L2 is 4mm or more, the temperature of the content decreases while passing through the lid portion 2, and therefore, if the content is taken 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 lowered while the content is conveyed through the peripheral wall by setting the height H2 of the peripheral wall.

When the convenience of drinking and the reduced fear of scalding are taken into consideration, the ratio of the length L1 of the drinking spout 5 to the length L2 from the drinking spout 5 may be 1.1 to 10, preferably 1.1 to 5.3. The shape of the drinking hole 5 is not limited to the illustrated shape, and any shape may be used. The connection portion 5a or the groove portion 6 shown in fig. 2 may be provided in the drinking spout 5.

Fig. 3 is a reference view showing a plastic cap. The plastic cap used in the related art is a cap fitted to the outside of the container, and has a fitting portion below the drinking spout 5, so that the lower groove portion 50 is present. When the contents are ingested, the contents may overflow from the drinking spout 5 to the lower groove portion 50, and the convenience of use may be poor. In particular, the elderly easily spill the contents into the lower groove portion 50.

In contrast, in the present embodiment, since the groove portion 6 is present, the usability of the paper-made lid 1 is improved.

Returning to fig. 2, the air hole portion 7 is provided to prevent the container 20 from being tightly fitted to the paper-made lid 1 and causing liquid leakage when the paper-made lid 1 is placed on the container 20. In the present embodiment, the air hole portions 7 are provided so as to overlap the groove portions 6. This also allows the contents stored in the recess of the lid top portion 2 to be returned from the air hole portion 7 into the container 20. The air holes 7 may be provided so as to avoid the grooves 6. The air hole 7 is not limited to the one for preventing leakage, and is formed as a escape part of 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 seal portion 8 is a seal portion 8a that closes the drinking opening 5, and the other end 8b has a function described later, and forms a removable seal.

The other end 8b can be used as a handle when peeling the seal portion 8. Alternatively, when the sealing portion 8a is gripped and the sealing portion 8 is peeled off, the other end 8b may be kept joined to the lid dome section 2. As shown in fig. 2(b), since the paper-made lid 1 and the container 20 are joined by the seal portion 8 by bonding the bonding surface of the grasped seal portion 8a to the tapered portion 21 or the curl portion 22 of the container 20, the paper-made lid 1 can be prevented from dropping into the container 20 or separating from the container 20, and the usability of the paper-made lid 1 can be improved.

Further, a flat portion may be provided by crushing a part of the upper side of the curl 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.

When the other end 8b is gripped and used, the adhesive may not be applied to the other end 8 b. In contrast, when the bonding surface of the seal portion 8a is bonded to the tapered portion 21 or the curl portion 22 of the container 20, the other end 8b may be bonded to be stronger than the seal portion 8 a. In any case, the adhesion of the seal portion 8a and the adhesion of the other end 8b are different.

The container 20 is a paper container having an opening on the 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 and the taper portion 3 of the paper lid 1 have opposite tapers, when the paper lid 1 is pushed into the container 20, the sealing between the paper lid 1 and the container 20 is improved, and the possibility of the content of the container 20 overflowing even when the container 20 is set down can be reduced. Further, various kinds of printing can be performed on the paper-made cover 1. Although details will be described in the third embodiment, which will be described later, a mark (line, mark, note) for pressing the paper-made lid 1 into the container 20 can be printed on the tapered portion 21 (side surface). Further, when the concave portion of the lid portion 2 is printed, the user can easily visually confirm the concave portion, and the description of the product and the description of the notice can be performed by printing. Note that, a mark (line, mark, note) for pushing the paper cover 1 may be provided on the container 20 side, and a note that the mark for pushing the paper cover 1 into the container 20 side may be printed on the concave portion or the tapered portion 3 of the top lid portion 2 or the mark may not be visible. The mark or the memo of the paper-made cover 1 may be combined with the mark or the memo of the container 20 to be a new mark or a new memo. The paper lid 1 of the present invention is not limited to use in a paper container, and can be used as a lid for various containers such as a plastic container and an expanded plastic container.

(second embodiment)

Hereinafter, a second embodiment will be described with reference to fig. 4. Fig. 4 is a sectional view of the paper-made lid 1 and the container 20 of the second embodiment, fig. 4(a) is a sectional view showing a state where the paper-made lid 1 is removed from the container 20, and fig. 4(b) is a sectional view showing a state where the paper-made lid 1 is fitted to the container 20.

In the present embodiment, the paper-made cover 1 is also provided with a curl portion 9. The curled portion 9 may be integrally provided on the paper-made cover 1, or a separate curled portion 9 may be joined to the paper-made 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 large, the sealing property between the paper lid 1 and the container 20 when the curl portion 9 and the curl portion 22 are fitted to each other can be improved. In this case, even when the container 20 is laid down, the possibility of the content of the container 20 overflowing can be reduced.

Note that the hinge portion may be configured by flattening a part of the lower end of the curl portion 9 to provide 1 flat portion, flattening a part of the upper end of the curl portion 22 to provide 1 flat portion, and joining the flat portions to each other. In this case, the size of the curl portion 9 may be smaller than the size of the curl portion 22.

(third embodiment)

Hereinafter, a third embodiment will be described 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 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 ring member of the holder 30 may be cut off.

Further, in order to prevent the container 20 from being dropped by mistake, the surface of the holder 30 may be provided with projections and depressions by press working, embossing, or the like, or may be coated with an anti-slip agent.

The hinge 31 is a connecting member that connects 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 holder 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 lid top portion 2. The hinge 31 may be bent into several pieces in a Z-shape to maintain elasticity. The hinge 31 may be formed of a wire or a cloth.

Further, a mark 10 serving as a mark for pressing the paper-made lid 1 into the container 20 is printed on the side surface of the paper-made lid 1.

Various joining methods such as ultrasonic joining, heat sealing, and adhesion can be applied to the joining method of the hinge 31.

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

Thus, the holder 30 is locked at a fixed position in the container 20, and thus the user does not feel 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 is shown in which the hinge 31 is not connected to the paper-made lid 1 and the container 20 except for both end portions thereof.

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

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

In the present embodiment, the tapered portion 3 of the paper-made lid 1 may have the same taper (regular taper) as the tapered portion 21 of the container 20.

(fourth embodiment)

Hereinafter, a fourth embodiment will be described 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 tapered portion 21 of the container 20. A part of the tapered ring member of the holder 30 may be cut off.

In the present embodiment, the tapered portion 3 of the paper-made lid 1 may have the same taper (positive taper) as the tapered portion 21 of the container 20.

In the third and fourth embodiments, the paper-made lid 1 and the holder are integrated via the hinge 31, and therefore, even when the contents of the container 20 are hot, the container 20 is not too hot to be gripped, and the contents of the container 20 are not cooled.

Fig. 7 is a modified example of the paper cover 1 with the bracket 30 of the third and fourth embodiments, and shows an example in which a handle and a bracket are provided to the paper cover 1. As shown in fig. 7, the holder 30 is extended in the lateral direction, and an opening 32 is provided in the extended portion to provide a handle. By integrally forming the lid, the holder, and the handle in this manner, the container 20 can be easily carried.

The paper lids 1 of the first and second embodiments can be stored or transported in a stacked manner, and therefore the logistics cost can be reduced.

The paper-made lids 1 with the holders 30 according to the third and fourth embodiments can be stored or transported in a stacked manner, and therefore can also reduce logistics costs.

Further, in the cap shown in the reference drawing of fig. 3, in the case of removing the cap from the container, placing the drinking spout 5 side on a table or the like, the drinking spout 5 is not hygienic with the table. On the contrary, when the drinking spout 5 is placed on a desk upside down, the contents of the container adhere to the bottom side of the lid, and therefore the contents adhere to the desk, which causes a need to clean the desk.

In contrast, in the paper cover 1 with the holder 30 of the third and fourth embodiments, even when the paper cover 1 is removed, the paper cover 1 is held by the holder 30. Therefore, the drinking hole 5 does not come into contact with a table, and the content attached to the bottom lid 4 does not fall down to the table even by the tapered portion 3, so that the convenience of use of the paper-made lid 1 can be improved.

(fifth embodiment)

In the above-described embodiment, an example in which the tapered portion 3 is fitted to the inside of the container 20 to fit the paper-made lid 1 to the inside of the container 20 is described, and an example in which the paper-made lid 1 is fitted to the outside of the container 20 will be 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 explain in sequence. For simplification of the drawings, the drinking spout 5 and the like are not shown.

The paper lid 1 of fig. 8(a) is provided with a second tapered portion 11 for fitting outside the curl portion 22. Further, the paper-made lid 1 is fitted to the outside of the container 20, and therefore, the size thereof becomes larger than that in the case of being fitted to the outside of the container 20. As shown in fig. 8(a), when the curl portion 22 is fitted to the second taper portion 11, the cost of the paper-made lid 1 can be reduced. Such a paper lid 1 is suitable for use as a lid of the cold container 20.

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

The paper lid 1 of fig. 8(b) is provided with an engaging portion 12 engageable with the inside of the curl portion 22, in addition to the second taper 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-made cover 1, and is bonded by various bonding methods such as adhesion and ultrasonic bonding. If a film is applied to each of the joining portions of the paper-made cover 1 and the engaging portion 12, the paper-made cover 1 and the engaging portion 12 can be joined by heat sealing.

By locating the curl portion 22 between the second tapered portion 11 and the engagement portion 12, the risk of the paper-made lid 1 being detached from the container 20 can be reduced. Therefore, the engaging portion 12 may not always be in contact with the curl portion 22, and for example, if the paper-made lid 1 is fitted into the container 20 and the second tapered portion 11 is fitted to the curl portion 22, a gap of about 0.1mm to 1.5mm may be present between the engaging portion 12 and the curl portion 22. The engaging portion 12 may be shaped to engage with the entire circumference of the curl portion 22, or may be shaped to engage with the curl portion 22 at several positions.

In the paper cover 1 of fig. 8(c), the engaging portion 12 is formed of the base 12a and the engaging portion 12 b. The base portion 12a and the engaging portion 12b may be formed integrally or may be formed separately and then joined. As shown in fig. 8(c), the engaging portion 12b may engage with the curl portion 22 at two points, and instead, may have a shape that can engage with the entire circumference of the curl portion 22.

By forming the engaging portion 12 by the base portion 12a and the engaging portion 12b in this manner, 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 a reverse tapered portion, or may be a straight portion instead of a tapered portion. When the paper-made lid 1 is fitted to the outside of the container 20, the tapered portion 3 may be formed linearly.

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 hole 5 formed in the concave portion becomes long, so that the paper lid 1 which is easier to drink can be realized. The curl portion 9 is preferably about 0.5mm to 1mm in the width direction. When the curl portion 9 is crushed by the press working, the press workability of the curl portion 9 can be improved by heating a part of the press working machine (for example, a lower die for holding the paper cover 1) to 50 to 90 ℃. Further, when the curl portion 9 is crushed, the outer shape of the paper-made lid 1 can be reduced, so that the number of times the paper-made lid 1 is conveyed can be increased, and the transportation cost per unit of the paper-made lid 1 can be reduced.

In fig. 8(b), the engaging 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 engaging 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 center of curling of the curled portion 22.

Similarly, in fig. 8(c), the engaging 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 engaging 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 center of curling of the curled portion 22.

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

In the reference example shown in fig. 3, since a fitting portion with the container 20 is present at the same position as or below the lower groove portion 50 and the plastic lid is removed from the vicinity of the fitting portion, the contents may touch the hand of the user and be burned.

In contrast, as described above, in the present embodiment, since the curl portion 9 is located above the position where the paper-made lid 1 is fitted to the container 20, the paper-made lid 1 can be easily detached from the container 20 by gripping the curl portion 9 or the peripheral wall around the curl portion with a hand, and there is no fear that the contents may reach the hand of the user.

Further, in the reference example shown in fig. 3, the plastic lid is removed from below the drink opening 5, and therefore there is a fear that the contents touch the hand of the user from the drink opening 5.

In contrast, in the present embodiment, the curl portion 9 formed on the upper side of the paper-made lid 1 above the drinking opening 5 or the peripheral wall around the curl portion is held by hand to remove the paper-made lid 1, and therefore, there is no fear that the contents may reach the hand of the user from the drinking opening 5. Note that, if the paper-made lid 1 is of a type in which the paper-made lid 1 is removed to drink the contents of the container 20, the drinking opening 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 made lid 1, a mouth is attached to the curl portion 9 to drink the contents from the drinking hole 5 formed in the top lid portion 2. This is the same taste as that when drinking the contents from the paper container 20, the mouth is attached to the curl portion 22. Therefore, the user does not feel the discomfort felt when drinking the contents from the drinking opening of the plastic cap. Since the tapered portion 3 and the tapered portion 21 are positively tapered, the contents can be drunk from the drinking hole 5 by attaching a mouth to the curl portion 9 at the same angle as when the contents are drunk from the paper-made container 20. Thus, the contents can be drunk from the paper lid 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 cover 1 of the sixth embodiment, showing an example in which the paper cover 1 is embedded outside the container 20 as in the fifth embodiment. Fig. 9(a) to 9(d) disclose 4 examples, and the description is made in order. For simplification of the drawings, the drinking spout 5 and the like are not shown.

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

In the paper-made lid 1 of fig. 9(a), the distal end of the second tapered portion 11 protrudes further toward the container 20 than the distal end of the tapered portion 12c so that the tapered portion 12c engages with the curl portion 22 after the second tapered portion 11 starts to engage with the curl 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 the curled portion 22 and the upper portion of the tapered portion 21 receive an inward force. In this state, the tapered portion 12c engages with the curl portion 22, and thus an outward force is applied to the curl portion 22 and the upper portion of the tapered portion 21, so that the paper-made lid 1 can be tightly fitted into the container 20. In this way, the paper-made lid 1 can be easily removed from the container 20 by making the taper length of the tapered portion 12c shorter than the taper length of the second tapered portion 11. Even in this case, by making the taper length of the tapered portion 12c longer than the diameter of the curl portion 22, the paper-made lid 1 can be reliably fitted into the container 20, and even when the temperature of the contents of the container 20 is high, accidents due to scalding can be reduced.

Note that, a curled portion may be formed on the upper surface of the engaging portion 12, and the engaging portion 12 may be joined to the bottom cover portion 4 by the curled portion.

In the paper made cover 1 of fig. 9(b), the tip of the second tapered part 11 is made to coincide with the tip of the tapered part 12c so that the second tapered part 11 and the tapered part 12c engage with the curl part 22 almost simultaneously. In the present embodiment, the distal end of the second tapered portion 11 is made to coincide with the distal end of the tapered portion 12c by the base portion 12a, but the distal end of the second tapered portion 11 may be made to coincide with the distal end of the tapered portion 12c by adjusting the size of at least one 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-made lid 1 can be fitted into the container 20 with good balance.

In the paper-made lid 1 of fig. 9(c), the tip of the tapered portion 12c protrudes further toward the container 20 than the tip of the second tapered portion 11 so that the second tapered portion 11 engages with the curl portion 22 after the tapered portion 12c starts to engage with the curl portion 22. In the present embodiment, the tip of the tapered portion 12c protrudes toward the container 20 from the tip of the second tapered portion 11 through the base portion 12a, but the tip of the tapered portion 12c may protrude toward the container 20 from the tip of the second tapered portion 11 by adjusting the size of at least one of the second tapered portion 11 and the tapered portion 12 c. By projecting the tip of the tapered portion 12c toward the container 20 further than the tip of the second tapered portion 11 in this manner, the second tapered portion 11 can be fitted to the curl portion 22 with the engagement between the tapered portion 12c and the curl portion 22 being guided. This allows the paper-made lid 1 to 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 engagement portion 12. The opening 33 allows the joining of the cap portion 2 and the engaging portion 12 to be performed only on the outer periphery of the engaging portion 12, thereby reducing the weight of the engaging portion 12. Further, an opening may be formed in the top lid portion 2 to reduce the weight of the top lid portion 2.

Fig. 10 and 11 are views showing a method of manufacturing the paper-made lid 1 according to the sixth embodiment, and the method of manufacturing the paper-made lid 1 according to the sixth embodiment will be described below with reference to fig. 10 and 11. The paper-made lid 1 of the sixth embodiment is manufactured by using the bottom 23 of the containers 20 having different sizes, but the paper-made lid 1 is not limited thereto, and the paper-made lid 1 may be manufactured by pressing, papermaking, or the like of a paper material. In this case, the punching workability of the paper cover 1 can be improved by heating at least a part of the punching machine (for example, a lower die holding the paper cover 1) to 50 to 90 ℃. The description will be continued by taking the paper-made 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 portion 23a is formed according to the size of the outer side (outer diameter) of the curl portion 22. The bottom portion 23b is formed according to the size of the inside (inner diameter) of the curl portion 22. As is also apparent from fig. 10(a), a part of the bottom portion 23a (the top lid portion 2 and the bottom lid portion 4) has a shape similar to that of the bottom portion 23 b. Therefore, when the paper-made lid 1 is fitted into the container with the tapered portion 3 serving as the first engaging portion and the tapered portion 12c serving as the second tapered portion, the possibility of the content of the container 20 overflowing can be reduced even when the container 20 is laid down. The weight per unit area of the bottom portion 23a and the bottom portion 23b may be the same, but the bottom portion 23a fitted to the outside of the container 20 is required to have strength, and therefore, the weight per unit area of the bottom portion 23a is desirably made larger than the weight per unit area of the bottom portion 23 b. When taken as an example, the weight per unit area of the bottom portion 23a is 200g/m²To 360g/m²The weight per unit area of the bottom 23b is 150g/m²To 199g/m². 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-made lid 1 is easily detached.

The bottom 23a and the bottom 23b may be made of the same paper material or different paper materials.

Fig. 10(b) has a curl portion 9 formed above the bottom portion 23 a. Fig. 11 is a partially enlarged view of the curl forming die 70. The curl forming die 70 includes 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 tip end portion accessible above the bottom portion 23 a. The upper die 71 includes an upper die groove portion 72 having a curved surface shape. The lower die 73 has: a holding portion that holds the bottom portion 23 a; and a lower mold groove 74 facing the upper mold groove 72.

When the lower die 73 holding the bottom portion 23a moves toward the upper die 71, the tip of the bottom portion 23a comes into contact with the upper groove portion 72, slides on the surface of the upper groove portion 72 along the curved surface of the upper groove portion 72, is pushed and spread to open outward, is gradually rounded, and comes into contact with the lower groove portion 74. Thereby, the bottom portion 23a is curled upward.

Fig. 10(c) shows a state where the top cover part 2a of the bottom part 23b is joined to the lower side of the top cover part 2 of the bottom part 23 a. Various joining methods such as adhesion and ultrasonic joining can be applied to the joining of the top cover portion 2 and the top cover portion 2 a. For example, if a film is applied to each of the joining portions of the lid portion 2 and the lid portion 2a, the lid portion 2 and the lid portion 2a can be joined by heat sealing because both the concave portion of the lid portion 2 and the concave portion of the lid portion 2a are formed as flat surfaces. It is desirable that the joining of the lid portion 2 and the lid portion 2a is performed such that the centers of the lid portion 2 and the lid portion 2a coincide with each other, but the joining is not limited to this. For example, the center of the lid top portion 2 and the lid top portion 2a may be offset so that the fitting of the curl portion 22 by the second tapered portion 11 and the tapered portion 12c is tightened at the drinking hole 5 and its vicinity.

After the top lid portion 2 and the top lid portion 2a are joined, the paper-made lid 1 can be manufactured by processing the drinking hole 5, the air hole portion 7, and the like.

Fig. 12 is a diagram showing another method of manufacturing the paper-made lid 1. In the present embodiment, the paper lid 1 is also manufactured using the bottom portion 23 of the container 20, but the paper lid 1 is not limited thereto, and the paper material may be press-worked to manufacture the paper lid 1.

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

Fig. 12(b) is a view in which the lower end portion is bent inward. By folding the lower end portion inward, as shown in fig. 12b, 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-made lid 1 is fitted into the container 20, the curl portion 22 of the container 20 is caught by the 1-layer portion and held. Further, since the tapered portion 3 of the paper-made lid 1 is fitted to the tapered portion 21 of the container 20, the paper-made lid 1 can be tightly fitted into the container 20.

In the present embodiment, the tapered portion 3 of the paper-made cap 1 and the tapered portion 21 of the container 20 are formed in reverse tapers, but the tapered portion 3 of the paper-made cap 1 and the tapered portion 21 of the container 20 may be formed in a forward taper, or the tapered portion 3 may be formed in a straight line. Note that, if the lower end portion is bent inward and the inner surface is provided with a convex portion or the inner surface is formed into a wavy shape, the paper-made lid 1 can be fitted into the container 20 more tightly.

Note that, as shown in fig. 4, fitting the curled portions to each other, as shown in fig. 9 and 10, fitting the curled portions to the tapered portions, and the like are disclosed in japanese application No. 2018-138005, which is filed on us provisional application No. 62/6966895, No. 2018, No. 7 and No. 23, which was filed on us provisional application No. 2018, No. 7 and No. 12, the applicant of the present application, the disclosure of which is incorporated in the present application, and the contents of which will be described below. Note that the symbols are changed only for the portions where the symbols overlap.

FIG. 13 (FIG. 38 of Japanese patent application No. 2018-138005) is a view showing another example of a fitting member using a crimping member 52 (56). Fig. 13(a) is a view showing an example in which tapered annular recessed portion 55 is provided in mounting portion 104. The taper of the tapered annular groove portion 55 is narrowed 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 view 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. Crimping member 56 is constructed the same as crimping member 52. The width W6 of the facing surface side of the tapered annular groove 57 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 the cover portion 105 is provided with the concave portion 15 whose peripheral edge is formed in a tapered ring shape, and the crimping member 52 is engaged in the tapered ring-shaped concave portion 15. The crimping member 52 is engaged along the tapered surface of the recess 15, and therefore the positioning of the crimping member 52 can be easily performed. Further, a portion of the crimping member 52 protrudes from the recess 15 toward the mounting portion 104.

Further, fig. 13(c) shows an example in which a recess 58 having a tapered shape formed at the peripheral edge is provided at the mounting portion 104, and the crimping member 56 is engaged with the recess 58 in such a manner that the crimping member 56 is accommodated in the recess 58. The crimp member 56 is engaged along the tapered surface of the recess 58, and therefore positioning of the crimp member 56 can be easily performed.

The major 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 into the crimping member 56.

In fig. 13(d), the mounting portion 104 is provided with a projection 17 having a tapered shape on the periphery. The major diameter d5 of the crimping member 52 is larger than the outer diameter d7 of the projection 17, and the crimping member 52 is fitted to the projection 17 by elastically deforming the crimping member 52 when the lid 105 is closed.

In fig. 13(a) to 13(d), the shapes and sizes of the crimping

members

52, 56, the recessed

portions

55, 57, and the recessed portion 58 are preferably set so that the upper surface 104a of the mounting portion 104 comes into contact with the upper surface 105a of the lid portion 105 when the lid is closed. Further, a foaming ink containing a foaming agent or a foaming hot melt adhesive may be applied and foamed to at least a part of the crimping

members

52, 56, the

groove portions

55, 57, and the

concave portions

15, 58. The recessed

portions

55, 57, the recessed

portions

15, 58, and the projecting portion 17 can be formed by press working.

As is clear from the above description, the fitting of curled portions to each other and the fitting of curled portions to tapered portions are disclosed in Japanese patent application No. 2018-138005.

The paper-made cover 1 of the sixth embodiment described above may be fitted to each other in other manners. 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 are explained in order. Here, fig. 19(a) to 19(c) show an example in which the tapered portion 12c of the engaging portion 12 and the tapered portion 21 of the container 20 are positively tapered, and fig. 19(d) to 19(f) show an example in which the tapered portion 12c of the engaging portion 12 and the tapered portion 21 of the container 20 are inversely tapered. For simplification of the drawings, the drinking spout 5 and the like are not shown.

In fig. 19(a), a curl portion 29 is formed on the upper surface of the engaging portion 12, and the engaging portion 12 is engaged with the lid portion 2 by the curl 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 laid down or excessively tilted, the fitting or engagement and both of them are used at the above-mentioned 3 points, so that the sealing property between the paper-made lid 1 and the container 20 is improved, and the possibility of the content of the container 20 overflowing 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 extended in the X axis direction. As described above, by flattening and laterally lengthening the curled portion 29, the area of joint between the curled portion 29 and the lid portion 2 can be increased, and therefore the engagement portion 12 can be reliably joined to the lid portion 2. Further, since the contact area between the curl portion 29 and the curl portion 22 can be increased, the fear of spilling the contents of the container 20 can be reduced. Note that the curled portion 29 can be flattened along the Z axis and extended in the X axis direction by press working.

Fig. 19(c) shows an example in which the curl portion 29 is flattened along the X axis of the same drawing and extended in the Z axis direction. As described above, by making the curl portion 29 longer in the vertical direction, a space is formed between the lower surface of the top lid portion 2 and the upper surface of the bottom lid portion 4, and this space functions as a heat insulating portion, so that the heat retaining property of the content in the container 20 can be improved. Further, since the contact area between the curl portion 29 and the curl portion 22 can be increased, the fear of spilling the contents of the container 20 can be reduced. Note that the curled portion 29 can be flattened along the Z axis and extended in the X axis direction by press working. The curl portion 29 functions like a packing (packing), and thus, the possibility of the content of the container 20 overflowing can be reduced.

Fig. 19(d) shows an example in which the engaging portion 12 shown in fig. 19(a) is turned upside down to be engaged with the top cover portion 2. Thereby, the tapered portion 12c of the engaging portion 12 and the tapered portion 21 of the container 20 are reversely tapered.

In the case where the tapered portion 12c and the tapered portion 21 are reverse tapered, point contact (line contact) is performed instead of surface contact at the time of fitting, and force at the time of fitting is concentrated on the fitting portion as compared with the case of surface contact. Therefore, the fitting property between the tapered portion 12c and the tapered portion 21 is improved, and the sealing property of the paper-made lid 1 is improved. Since the tapered portion 12c and the tapered portion 21 are made of paper material, the tapered portion 12c and the tapered portion 21 are deformed by fitting to form several flat surface portions. The flat surface portion improves the fitting property of the tapered portion 12c and the tapered portion 21. Further, when the paper-made cap 1 is removed from the container 20, the tapered portion 12c and the tapered portion 21 are in point contact (line contact), and therefore, the fitting length is shorter than that in the case of a regular taper, and therefore, the paper-made cap 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 extended in the X axis direction. By flattening and laterally lengthening the curl portion 29 in this manner, 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 curl portion 29 is flattened along the X axis of fig. 19(f) and extended in the Z axis direction. By thus making the curl portion 29 longer in the longitudinal direction, the fitting position of the tapered portion 12c and the tapered portion 21 can be made larger than in the example of fig. 19 (d). By making the tapered portion 12c and the tapered portion 21 reverse tapered and appropriately setting the size of the fitting portion between the curl portion 29 and the tapered portion 21, the paper-made lid 1 with excellent usability can be realized.

The paper cover 1 of the fourth and fifth embodiments may be a band bracket 30.

In addition, various modifications and the like can be made. A modified example of the seal 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 into a C-shape and joined to the concave portion of the lid dome portion 2 by an adhesive 13 applied to the lower surface side of the sealing portion 8. Further, an adhesive 14 is applied to the upper surface side of the sealing portion 8. It is desirable that: the adhesive 14 is a removable adhesive.

Fig. 14(b) shows a state where one end of the upper surface of the sealing portion 8 is pulled out, and one end of the upper surface of the sealing portion 8 is engaged with the tapered portion 21 of the container 20 by the adhesive 14. By thus joining the paper-made lid 1 to the container 20 using the seal portion 8, the paper-made lid 1 can be prevented from falling into the container 20. In fig. 14, the adhesive 14 is applied to the end portion of the upper surface of the sealing portion 8, and in order not to stick the adhesive 14 to the hand, it is desirable that: 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 greater than the adhesive force of the adhesive 14. Alternatively, or in addition thereto, it is preferable that the amount of application of the adhesive 13 is larger than the amount of application of the adhesive 14. The lower surface of the sealing portion 8 may be joined to the concave portion of the top lid portion 2 by heat sealing instead of the adhesive 13.

Fig. 15 shows an example in which the adhesive 14 of the paper-made lid 1 of fig. 14 is omitted, and instead of the adhesive 14, the end portion of the upper surface of the seal portion 8 is engaged with the curl portion 22, thereby preventing the paper-made lid 1 from falling out into the container 20. The end portion of the upper surface of the seal portion 8 is formed in a V shape so as to engage with the curl portion 22. In order to maintain the V-shape, it is preferable to bond the valley portions of the V-shape in advance by various bonding methods such as adhesion, heat sealing, ultrasonic bonding, and high-frequency bonding.

The sealing portion 8 in fig. 14 and 15 may be a sealing member that covers the drinking hole 5, or may be a seal different from the sealing member that covers the drinking hole 5. In the case where the drinking hole 5 is covered with the seal portion 8, it is desirable that: the adhesive 13 is not provided at the portion facing the drinking spout 5 and the periphery thereof.

(seventh embodiment)

Fig. 16 is a schematic view of a paper cover 1 according to a seventh embodiment. Note that, in order to simplify the drawing, the seal portion 8 illustrated in fig. 2 is not illustrated. In the present embodiment, a window portion 18 is provided to allow the contents of the container 20 to be visually checked, and a notch portion 24 is provided in the window portion 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 window may be any shape and size as long as the contents of the container 20 can be visually confirmed. Further, as shown in fig. 16(b), the window portion 18 may take a shape that does not interfere with the drink 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 portion 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 and an adhesive so as to cover the opening. In this case, the film may be joined to one surface (for example, the upper surface side) of the paper material, or two film rolls may be provided and joined to both surfaces (the upper surface side and the lower surface side).

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

The notch 24 is a member for inserting a straw, and in the present embodiment, has a notch indicated by a solid line and a half-cut formed at both ends of the notch and indicated by a broken line. Note that, if the paper-made lid 1 is hot, the notch portion 24 may be omitted. The width of the cutaway groove portion 24 may be set to about 0.3mm to 1 mm. If the slit groove that can communicate with the container 20 side is provided by inserting the cutter into the film in a state where the film of the window portion 18 is stretched, the width of the slit groove becomes narrower due to the elasticity of the film when the cutter is pulled out, and the slit groove width becomes narrower toward the container 20 side. Therefore, in the state before inserting the straw, even if the paper-made lid 1 is fitted into the container 20 and the container 20 is turned upside down, the content hardly leaks from the notch 24, and even if the container 20 is not set aside, the content does not leak from the paper-made lid 1. The notch 24 may be a cross line, a radial line, a curved line (for example, an S-shape), or the like.

Since the notch portion 24 is formed with the notch as described above, the straw can be easily inserted. Further, in the present embodiment, since the half-cuts are formed at both ends of the notch, the half-cut portion is broken when the straw having a large diameter is inserted. Therefore, the notch 24 of the present embodiment can easily insert a straw having a small diameter or a straw having a large diameter.

Fig. 16(c) shows an example in which 2-point (multiple-point) window portions 18 are provided, and the notch portion 24 is also provided with 2-point (multiple-point). However, the cutaway groove portion 24 may be at 1. The two window portions 18 are provided in bilateral symmetry, so that the visibility can be improved, and the two window portions 18 are provided at positions shifted from the center of the top cover portion 2, so that the visibility can be improved.

In the example of fig. 16(a) to 16(c), it is preferable that: the window 18 is set to about 5% to 50% of the area of the lid member 2. When the size of the window portion 18 is less than 5% of the area of the lid portion 2, the visual confirmation thereof is deteriorated. When the size of the window portion 18 exceeds 50% of the area of the lid portion 2, the amount of the film used increases, which is not preferable from the environmental aspect.

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

In addition to the formation of the window portion 18, the display portion 40 and the notch portion 41 are provided to facilitate visual confirmation of the contents of the container 20.

Fig. 17 is a sectional view of the paper cover 1 of the seventh embodiment, fig. 17 a shows a case where the paper cover 1 (fig. 8 a) of the fifth embodiment is provided with a window 18, and fig. 17 b shows a case where the paper cover 1 (fig. 9 a) of the sixth embodiment is provided with a window 18. For simplification of the drawings, the drinking hole 5, the notch 24, and the like are not shown. As shown in fig. 17(a), the lid portion 2 is formed with a window portion 18. In addition, a film may be stretched in a portion indicated by reference numeral 4(a lower portion of the bottom cover portion 4) to form the window portion 18. By providing two window portions 18 in this manner, the space formed by the two films functions as a heat insulating portion, and therefore, the heat retaining property of the contents in the container 20 can be improved.

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

Further, a film may be stretched as the window portion 18 also in a portion (lower portion of the engaging portion 12) indicated by the reference numeral 12, or a film may be stretched as the window portion 18 also in a portion (lower portion of the bottom cover portion 4) indicated by the reference numeral 4. 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 retaining property of the contents in the container 20 can be improved.

Fig. 20 is an enlarged sectional view of the window portion 18 of the seventh embodiment, and the notch portion 24 is omitted for simplification of the drawing. When the notch portion 24 is formed in the window portion 18, the vicinity of the notch portion 24 becomes weaker than other portions. Therefore, in fig. 20(a), a reinforcing portion 27 is formed as a reinforcement in the vicinity of the notch portion 24. An adhesive (e.g., hot melt adhesive) is applied as the reinforcing portion 27. The adhesive is cured by drying, and the vicinity of the notch portion 24 can be reinforced.

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

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 paper-made lid 1 is formed with the opening 19, and the notch 24 is not formed, but the notch 24 is formed as another member. The other member is a second seal portion 28, and three examples are illustrated on the right side of fig. 21 (a). The following description will be continued in order from the top.

Any of the second sealing portions 28 may be made of a film, a paper material, aluminum, a nonwoven fabric, rubber, cloth, or the like. These materials may be used for the sub-second sealing portion 28 a.

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

This allows the straw to be inserted from the notch 24.

The second seal portion 28 in the middle is formed in a circular shape (doughmut), and a sub-second seal portion 28a smaller than the second seal portion 28 is formed above the second seal portion 28. The second seal portion 28 is formed with the notch portion 24 as described above and is joined to the periphery of the opening portion 19. The sub-second seal 28a is bonded to the second seal 28 with a removable adhesive applied thereto. Note that, if the notch portion 24 is not formed in the sub-second seal portion 28a, the notch portion 24 of the second seal portion 28 is not exposed, and therefore, the sanitary property is obtained. Then, the straw can be inserted from the notch portion 24 by peeling the sub-second seal portion 28a from the second seal portion 28. The notch 24 may be formed also in the sub-second seal portion 28 a.

By providing the sub-second seal portion 28a in this manner, the notch portion 24 formed in the second seal portion 28 can be reinforced like the reinforcement 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 seal portion 28a is not cut off, but is integrated with the second seal portion 28. Therefore, the straw can be inserted from the notch portion 24 by turning the sub-second seal portion 28a away from the second seal portion 28.

Note that, by printing at least one of the second seal portion 28 and the sub-second seal portion 28a, a mark that indicates the insertion port of the straw can be provided.

Further, it is desirable that: the cutting groove 24 has a shape and size corresponding to a straw made of paper or a straw having a blunt tip.

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

The uppermost second seal portion 28 may be peeled off from the window portion 18 by a removable adhesive. Further, the second seal portion 28 may be turned over by welding the outer periphery of about half of the second seal portion 28 to the window portion 18 by heat sealing or the like.

The second seal portion 28 at the center is formed in a circular shape, and the sub-second seal portion 28a may be peeled off from the second seal portion 28 by a removable adhesive. Further, the sub-second seal portion 28a may be turned over by welding the outer periphery of about half of the sub-second seal portion 28a to the second seal portion 28 by heat sealing or the like. The second seal 28 may have a notch 24 formed corresponding to the notch 24 of the window 18, or may have 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 seal portion 28a is not cut off, but is integrated with the second seal portion 28. In the second seal portion 28, a notch portion 24 or an opening is formed corresponding to the notch portion 24 of the window portion 18.

Therefore, the straw can be inserted from the notch portion 24 by turning the sub-second seal portion 28a away from the second seal portion 28. The second sealing portion 28 in fig. 21(a) and 21(b) may be formed of 2 sealing portions (e.g., semicircular or rectangular), and a part thereof may overlap by several millimeters. One end of the second sealing portion 28 may be bent upward to be gripped by fingers.

(eighth embodiment)

Fig. 22(a) shows a cross-sectional view of the paper-made lid 1 of the eighth embodiment together with a partially enlarged view. In the present embodiment, a recess 35 is formed in the recess of the top cover portion 2. An engaging portion 36 that engages with the curl portion 22 is joined to the top cover portion 2. Further, a portion other than a part of the second tapered portion 11 is pressed, whereby a circumferential convex portion 37 is formed as a result. Note that, although the drawing is simplified, the curl portion 9 and the curl portion 22 are curled outward. Note that, in order to simplify the drawing, the drinking spout 5 is not shown.

As an example of the size of the paper cover 1, the diameter is about 70mm to 140mm, the overall height H1 of the paper cover 1 is 12mm to 20mm, and the height H2 from the curl portion 9 to the peripheral wall of the top lid portion 2 is 3.5mm to 12 mm. Although the height H2 of the peripheral wall is preferably 6mm to 9mm depending on the capacity of the paper-made lid 1, and the height H1 is set to about 36% to 53% of the height H2, from the viewpoint of convenience of drinking, whereby the paper-made lid 1 having a good balance can be obtained. Further, it is desirable that: the diameter of the curl portion 9 is about 2mm to 3mm, and the height obtained by subtracting the diameter of the curl portion 9 from the height H2 of the peripheral wall is larger than the diameter (height) of the curl portion. Thus, even when the hot beverage is taken from the drinking spout 5 by touching the mouth to the curl portion 9, the temperature of the contents is lowered in accordance with the height H2 of the peripheral wall, and therefore the fear 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 hole 5 is 1mm to 15mm, preferably 4mm to 12mm, the length L2 from the drinking hole 5 is set to 4.5mm to 27mm, preferably 15mm to 25mm, together with the height H2 of the peripheral wall, and when the contents are taken through the peripheral wall, the risk of scalding can be further reduced. Although the drawings are different in appearance, the dimensions of the paper cover 1 described above can be applied to the fourth to seventh embodiments. Furthermore, the paper-made lid 1 of the present embodiment has a basis weight of less than 150g/m2 to 300g/m²Preferably, it is 200g/m²～250g/m²The right and left are good. By reducing the weight per unit area in this manner, the curled portion 22 of the container 20 is not deformed or damaged when the paper-made lid 1 is attached to the container 20. The weight per unit area of the top lid portion 2 and the weight per unit area of the second tapered portion 11 may be the same or different, but it is preferable 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 make it soft.

The concave portion 35 of the lid dome section 2 can be formed by, for example, press working, and it is desirable that: the depth is set to about 0.8mm to 2.0 mm. It is preferable that the width of the recess 35 is set so that at least the upper part of the curl portion 22 can be housed at both ends of the lid portion 2, or may be set to a width slightly smaller than the width of the curl portion 22, and at least the upper part of the curl portion 22 can be housed by elastic deformation at both ends of the lid portion 2. In this way, when at least the upper portion of the curl portion 22 is received by both ends of the lid portion 2, the sealing property between the paper lid 1 and the container 20 is improved.

In order to facilitate formation of the recess 35, it is desirable that: the paper material (or the paper lid 1) is heated by infrared rays or hot air to a temperature (for example, 50 to 100 ℃) that does not affect the coating agent of the paper material. Further, the lower die of the press machine holding the paper material (or the paper cover 1) is preferably 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 machine may be performed by either one of them or both of them. By forming the concave portion 35 in this manner, as shown in a partially enlarged view, the space between the second tapered portion 11 and the concave portion 35 is reduced, and the sealing property when the paper-made lid 1 is mounted on the container 20 is improved. The concave portion 35 may be formed such that an end portion of the concave portion 35 contacts the curl portion 22. The concave portion 35 may be formed by pressing a portion corresponding to the concave portion 35, or may be formed by pressing both ends of the lid portion 2 with the paper-made lid 1 turned upside down.

The engaging portion 36 is an annular (ring-shaped) member formed of a paper material provided with a coating such as a film, and is joined to the inside of the top lid portion 2 by, for example, heat sealing, ultrasonic bonding, or the like. Both ends of the engaging portion 36 are free ends that are not joined to the lid dome portion 2. Both ends of the engaging portion 36 may be tapered, may be a forward taper having the same taper direction as the tapered portion 21, or may be a reverse taper having a taper direction different from the tapered portion 21.

The engaging portion 36 is sized to be engageable with the curl portion 22, and although not shown, the free end of the engaging portion 36 is bent upward by the engagement of the curl portion 22. The engagement portion 36 functions as a seal, and thus, the sealing property when the paper-made lid 1 is attached 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-made cover 1, and is 150g/m²～250g/m²The right and left are good.

Since the engaging portion 36 is annular, a space is formed inside thereof, and the space functions as a heat insulating portion, so that the heat retaining property of the content in the container 20 can be improved. Further, when the container 20 is tilted, the space S1 formed by the curl portion 22, the top lid portion 2, and the engagement portion 36 can hold the contents from the container 20, and therefore, leakage of the contents from the paper lid 1 other than the drinking hole 5 can be reduced. The engaging portion 36 may be solid, rather than annular, and various corrugated sheets having grooves may be used as the paper material, or a film (e.g., 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 portion 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 a 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 falling off. A plurality of convex portions 37 may be provided on the inner peripheral surface of the second tapered portion. For example, two convex portions 37 may be formed separately in the vertical direction, and the curl portion 22 may be fitted between the two convex portions 37. In this case, the distance between the two convex portions 37 is made narrower than the diameter of the curl portion 22, so that the curl portion 22 is crushed (deformed) and the paper-made lid 1 is fitted to the container 20, thereby improving the sealing property between the paper-made lid 1 and the container 20. The convex portions 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 thin film is used as the engaging portion 36, and the description will be made in order below. Fig. 22(b) shows a state in which the curl portion 22 passes over the free end of the engaging portion 36 when the paper-made lid 1 is attached to the container 20. In this case, since the space S1 formed by the curl portion 22, the top lid portion 2, and the engagement portion 36 can hold the contents from the container 20, leakage of the contents from the paper lid 1 other than the drinking hole 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 a right angle, an acute angle, or an obtuse angle. This can further reduce the gap between the second tapered portion 11 and the end of the engaging 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-made 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 and the periphery of the engaging portion 36 are joined to the top lid portion 2, and a portion joined to the top lid portion 2 and a portion joined to the side surface of the second tapered portion 11 are not joined anywhere. When the paper lid 1 is mounted on the container 20, the curl portion 22 abuts on the portion which is not joined anywhere, and the film forming the engaging portion 36 is elastically deformed toward the paper lid 1, whereby the paper lid 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 except the drinking hole 5.

Further, a space portion S1 is formed by the top lid portion 2, the second tapered portion 11, the engagement portion 36, and the curl portion 22. For example, even when the paper container 20 is strongly gripped by hand and the container 20 is deformed, the space portion S1 follows the deformation or exerts a cushioning function, and thus the paper lid 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 lid portion 2. In this case, when the paper-made lid 1 is attached to the container 20, the film forming the engaging portion 36 is elastically deformed toward the paper-made lid 1, and thereby the paper-made lid 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 except the drinking hole 5. The engagement portion 36 may be made of the paper material provided with a coating such as a film, and in this case, it is preferable that the engagement portion 36 is formed in a solid shape and the engagement portion 36 is joined to the top lid portion 2. Due to the manufacturing process, the flatness of the top lid portion 2 may deteriorate, and there is a possibility that the contents may leak from the top lid portion 2 and the curl portion 22 due to the deterioration of the flatness of the top lid portion 2. Therefore, by engaging the curl portion 22 with the engagement portion 36 that retains flatness, the possibility of the occurrence of the leakage can be reduced. The engaging portion 36 may be formed in a ring shape.

The engagement portion 36 may be engaged by any of the various engagement methods described above. Further, a film other than the polyethylene film may be used as the film. In addition, other materials such as a paper material and an air-laid material in which pulverized pulp is laminated 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 omitted. When the recess 35 is formed, a part of the engaging portion 36 may be joined to 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 is improved. This improves the sealing property between the paper-made 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 the following description is made in order. In fig. 22(e), the end of the engaging portion 36 is formed by press working so as to substantially cover the outside of the curl portion 22. The contact surfaces of the concave portion 35 and the engaging portion 36 are joined. The end of the engaging 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 size 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 curl portion 22.

When the bottom portion 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 the contents of the container 20 may leak from the seam. However, the end of the engaging portion 36 can be sealed by pressing a part of the inner seam of the peripheral wall of the platen cover 1. Therefore, the contents can be prevented from leaking from the paper cover 1 along the seam. Thus, even when the container 20 is tilted, the engaging portion 36 covers the outside of the curl portion 22, and therefore, the contents do not leak from the paper-made lid 1 except for the drinking hole 5. Further, even when the paper container 20 is gripped by hand and the container 20 is deformed, the space portion S1 functions as a buffer or follows the deformation due to the elasticity of the space portion S1, and thus the paper lid 1 is not easily detached from the container 20, due to the space portion S1 formed by the top lid portion 2, the second tapered portion 11, the engaging portion 36, and the curl portion 22.

When the drinking hole 5 is formed at a certain portion of the seam inside the peripheral wall of the paper lid 1, the contents leak out through the seam. Therefore, it is desirable that: the drinking hole 5 is provided at a position different from the seam inside the peripheral wall of the paper lid 1(a position where interference does not occur).

When the engaging portion 36 in fig. 22(e) is formed of a thin film and the engaging portion 36 is engaged with the curl portion 22 by the elasticity of the thin film, the adhesion between the engaging portion 36 and the curl 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 into a shape substantially covering the outer side and the inner side of the curl portion 22 by press working. As described above, if the end of the engaging portion 36 presses and seals a part of the inner joint of the peripheral wall of the paper cover 1, the content can be prevented from leaking from the paper cover 1 along the joint. The recess 36b of the engaging portion 36 can press and seal a part of the seam formed inside the peripheral wall of the container 20. Therefore, the content can be prevented from leaking from the paper made lid 1 along the seam inside 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 curl portion 22, and therefore, the contents do not leak from the paper-made lid 1 except the drinking hole 5. The drinking hole 5 may be provided in a portion where the recess 35 and the engaging portion 36 contact each other.

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 a convex portion 36a as a first portion, a concave portion 36b as a second portion, and an opening portion 36c are formed. The outer diameter of the engaging portion 36 is larger than the outer diameter of the base cover portion 4. Therefore, when the engaging portion 36 is fitted into the lid portion 2, an end portion of the engaging portion 36 may be bent toward the container 20. This improves the sealing property between the paper-made lid 1 and the container 20. In this way, when the engagement portion 36 is fitted into the top lid portion 2 while the outer diameter of the engagement portion 36 is made larger than the outer diameter of the bottom lid portion 4, the joining of the top lid portion 2 and the engagement portion 36 by heat sealing or the like may be omitted.

The thickness of the engaging portion 36, excluding the convex portion 36a and the concave portion 36b, is about 0.7mm to 2.0 mm. By setting the thickness of the engaging portion 36 in this manner, the strength of the roof portion 2 and the recess 35 is increased, and the flatness of the roof portion 2 and the recess 35 is 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 convex portion 36a is formed in a semicircular shape so as to engage with the curl portion 22, but may be formed in an inverted U shape or an inverted V shape. When the convex portion 36a is engaged with the curled portion 22, the size (semicircular size or the like) of the convex portion 36a 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 curl portion 22, and the concave portion 36b is shaped to cover the outside of the curl portion 22. That is, the convex portion 36a and the concave portion 36b cover the curl portion 22. Note that all the curl portions 22 may not be covered with the convex portions 36a and the 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 for forming the convex portion 36a and the concave portion 36b may be performed in a state where the thin film is bonded, or the thin film may be stretched after the press working. When the film is stretched on the surface of the convex portion 36a opposite to the curl portion 22 after the convex portion 36a is formed, the convex portion 36a can be engaged with the outside of the curl portion 22 by the elasticity of the film.

The opening 36c is a positioning opening for joining the engaging portion 36 to the recess 35, and the size thereof can be set as appropriate. The opening 36c may be omitted, and the outer periphery of the engagement portion 36 may be used to perform positioning for engaging with the recess 35, or a notch (notch) may be formed in the engagement portion 36 to perform positioning for engaging 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. A coating layer such as a film is provided on at least one surface (the surface facing the container 20) of the elastic paper material. As the paper material having elasticity, various corrugated papers can be used. Corrugated cardboard is excellent in cushioning properties and rigidity due to the flutes, but is weak in rigidity at the end portions and is easily elastically deformed. When corrugated paper is used as the engaging portion 36, the end portion thereof engages with the curl portion 22 and is elastically deformed, so that the sealing property between the paper-made 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 a flexible paper material subjected to embossing or an airlaid material (japanese patent No. エアレイド). In this case, it is preferable to provide a coating such as a film or to coat a water repellent on 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.

The airlaid material can be made tight by heat-sealing it with a film, not by laminating it with a paper material, and by subjecting the heat-sealed surface of the airlaid material to a burning prevention treatment (Japanese: the treatment of き and め). In this way, the engaging portion 36 can be formed by the coating layer (waterproof layer) and the elastic layer.

Further, as the paper material having elasticity, it is possible to laminate a plurality of pieces of tissue paper and provide a coating layer on the laminated tissue paper.

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

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 (toward the space S1) by the engagement with the curl portion 22.

Further, the distance between the second tapered portion 11 and the end of the engaging portion 36 may be made 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 engaging portion 36.

In fig. 22(e) to 22(g), the convex portion 37 may be provided in the second tapered portion 11, or the concave portion 35 may be omitted. In the examples of fig. 22(c), 22(e), and 22(f), in the case where the convex portion 37 is provided in the second tapered portion 11, it is desirable that: the end of the engaging portion 36 is shaped to cover the convex portion 37. Thus, the contents of the container 20 are 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 set to an acute angle smaller than the taper angle of the tapered portion 21 of the container 20, the volume of the space portion S1 can be made larger. Thus, even when the container 20 is deformed, the paper-made lid 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 circumferential 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-made lid 1 of the eighth embodiment, showing two examples of fig. 27(a) and 27(b), which are also explained in order. In both examples, the recess 35 and the engaging portion 36 are omitted, but the recess 35 and the engaging 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 curl portion 22 enters smaller than the outer diameter of the curl portion 22, at least one of the curl portion 22 and the convex portion 37 can be deformed to fit the curl portion 22 and the convex portion 37, and therefore, the sealing property between the paper-made lid 1 and the container 20 is 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 tapered portion 11a is 5 °, and the taper angle is increased (larger) as compared with the weak tapered portion 11b described later. The weak tapered portion 11b is provided on the container 20 side (the curl portion 22 side) of the strong tapered portion 11a, and has a taper angle of 3 ° as an example, and the taper angle is weakened (reduced) compared to the strong tapered portion 11 a. By thus weakening (reducing) the taper angle on the container 20 side (curled portion 22 side), the curled portion 22 easily enters the paper-made lid 1.

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

Fig. 23 is a sectional view showing the seal portion 8 of the paper-made lid 1 according to the eighth embodiment, showing three examples of fig. 23(a) to 23(c), and the following description will be made in order. Note that, 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 that seals the drinking opening 5 formed in the recess 35 of the top lid portion 2. A view of the drinking spout 5 from above is shown below. The drinking spout 5 has the same shape as that shown in fig. 2(c), and is opened in the arrow direction of the paper-made lid 1 by adding a notch to the recess 35. The sealing portion 8 is sized to cover the drinking hole 5, but may be sized to cover a part of the drinking hole 5. Since it is difficult to visually confirm the drinking spout 5, characters or pictures indicating the location of the drinking spout 5 can be printed on the seal portion 8.

The sealing portion 8 is of an inverted C-shape, and the lower surface of the sealing portion 8 is joined to the recess 35 by an adhesive 13 provided corresponding to the upper surface of the drinking spout 5. The tip of the free end of the seal portion 8 extends upward to serve as a handle portion of the seal portion 8.

The surface of the sealing portion 8 opposite to the lower surface coated with the adhesive 13 is coated with a removable adhesive 14 in a dispersed manner. The removable adhesive 14 may be applied in a spot shape, may be applied in a spiral shape, or may be applied continuously. When the knob 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 is opened. When the seal portion 8 is pulled in the direction of the arrow, the seal portion 8 changes from the inverted C-shape to a straight line shape, and the removable adhesive 14 faces the concave portion 35. In this state, the removable adhesive 14 is pressed against the concave portion 35, whereby the open state of the drinking spout 5 can be maintained.

In fig. 23(b), the position of applying the removable adhesive 14 is different from that in fig. 23(a), and the removable adhesive 14 is applied to the upper back surface of the inverted C shape. When the knob portion is pulled in the direction indicated by the arrow in fig. 23(b), the drinking hole 5 is opened, the seal portion 8 is changed from the inverted C-shape to the linear shape, and the removable adhesive 14 faces the concave portion 35. In this state, the removable adhesive 14 is pressed against the concave portion 35, whereby the open 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 removable 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 hole 5. In this case, the removable adhesive 14 may be applied so as to be bonded to the recessed portion 35, or may be applied so as not to be bonded to the recessed portion 35. When the removable adhesive 14 is bonded to the recess 35, it is preferable to attach a release paper to the recess 35 bonded to the removable adhesive 14, or to coat the recess 35 with a release agent such as silicon or teflon (registered trademark). The release paper is preferably provided so as not to interfere with at least a part of the adhesive 13 (the drinking hole 5 side).

After the tab portion is pulled in the direction indicated by the arrow in fig. 23(c) to open the drinking hole 5, the removable adhesive 14 is pressed against the concave portion 35, whereby the open state of the drinking hole 5 can be maintained.

In the present embodiment, the adhesive force of the adhesive 13 is greater than the adhesive force of the adhesive 14. Alternatively, or in addition thereto, it is preferable that the amount of application of the adhesive 13 is larger than the amount of application of the adhesive 14. Note that the lower surface of the seal portion 8 and the concave portion 35 may be joined by heat sealing instead of the adhesive 13. Further, the seal portion 8 may be formed to be Z-folded. Further, the flat top cover portion 2 may be used without forming the recess 35.

In the drinking spout 5 shown in fig. 2 and 23, the diameter of the drinking spout 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. Therefore, the large ice does not pass through the drinking opening 5, and children can be prevented from eating the large ice by mistake.

(method of manufacturing paper Cap 1 of FIG. 27 (a))

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

The material forming the tapered portion 3 of the paper-made cover 1 (the paper material having a coating called a fan shape) is molded into a fan shape as shown in fig. 26, and the display portion 40 is printed in this state (step S1). Note that printing may be performed before the display portion 40 is molded into a fan shape. In addition, the display portion 40 may be printed on a paper material, and may be printed on a film as a coating. The number of display units 40 is not limited to three. Ideally: subsequently, the display unit 40 is printed to form the slits of the slit portion 41.

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 is joined by overlapping the two ends of the fan-shaped paper material by a portion, for example, by ultrasonic bonding. Thereby, the tapered portion 3 is formed (step S2). In this case, the tapered portion 3 is formed using a mold for molding the tapered portion 3. The partially overlapped portion serves as a seam.

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 is a peripheral wall surrounding the curl portion 9 and the top lid portion 2, which will be described below.

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

The stock roll 60 is a coated paper material used in the formation of the cover dome section 2. As shown in fig. 29, the upper end and the lower end of the blank roll 60 are formed in a wave shape. The waveform will be described below.

Fig. 30 is a view showing a method of pulling out (る in japanese: drawing out き) the lid dome section 2 from the blank roll 60 a. Here, the top cover portions 2 are pulled out from the blank roll 60a by two rows. In the case of drawing the cap portion 2 with the first row and the second row at the same vertical positions as shown in fig. 30(a), the portion shown in black is discarded after the cap portion 2 is drawn.

On the other hand, as shown in fig. 30(b), when the top lid section 2 is pulled out with the first row and the second row of the top lid section 2 being shifted in vertical position, the number of discarded black-painted portions is reduced. Further, since the width w of the blank roll 60a is not used, the width of the blank roll 60a having the width w can be saved, the blank roll 60a can be used efficiently, and the manufacturing cost of the paper-made lid 1 can be reduced. Preferably, the vertical displacement 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, the top lid sections 2 are drawn out from the blank roll 60a by two rows, but three or more rows of top lid sections 2 may be drawn out according to the width of the blank roll 60 a.

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

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

The blank roll 60 with the seal 8 joined thereto is conveyed to the third processing station 63. In the third processing station 63, the processing for forming the drinking spout 5 is performed using a cutter. Further, in the third processing station 63, the drawing of the lid dome section 2 is performed using a cutter. The drinking spout 5 is processed using the seal portion 8 joined to the blank roll 60 as a mark.

The cover dome section 2 is drawn out in the manner shown by the circular broken lines. Further, the outer periphery of the lid top portion 2 is bent by press working so that the lid top portion 2 is joined between the tapered portion 3 having a U-shaped cross section and the second tapered portion 11 (step S3). The process of forming the drinking hole 5 and the process of removing the top lid portion 2 may be performed one at a time or simultaneously.

In addition, instead of the layout of the second processing station 62 and the third processing station 63, the third processing station 63 may be processed before the second processing station 62 is processed. In this case, the sealing portion 8 is joined to the lid portion 2 with the drinking hole 5 as a mark.

In the present embodiment, the top lid portion 2 after the end of the processing in the third processing station 63 is conveyed to the fourth processing station 64.

In the fourth processing station 64, the top lid portion 2, the outer periphery of which is bent by press working, is fitted between the tapered portion 3 having a U-shaped cross section and the second tapered portion 11. The heating process 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 cap portion 2, the tapered portion 3, and the second tapered portion 11 are melted, and the cap portion 2, the tapered portion 3, and the second tapered portion 11 are heat-sealed and joined. Further, a peripheral wall surrounding the top lid portion 2 is formed by the tapered portion 3. In the above description, the lower edge of the fan-shaped coated paper material is pressed to form the second tapered portion 11 in step S2, and the outer periphery of the top lid portion 2 is pressed and bent in step S3, but the present invention is not limited thereto. For example, at least one of these press working processes may be performed immediately before the heat treatment in step S4 or simultaneously with the heat treatment.

When the top lid portion 2, the tapered portion 3, and the second tapered portion 11 are heat-sealed, the drinking opening 5 preferably avoids a seam formed in the tapered portion 3 (also referred to as a peripheral wall surrounding the top lid portion). Therefore, it is desirable that: the heat sealing is performed after the marks provided at the seams or in the vicinity of the seams are detected by a detection device, not shown, and the position of the drinking hole 5 is adjusted by rotating the lid top portion 2 based on the detection result.

The drinking hole 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 subsequently to the formation of the drinking hole 5, 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 block member partially recessed, a portion not pressed by the recessed portion of the block member is formed as the convex portion 37 (step S5). The convex 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 convex portion 37 can be adjusted according to the weight per unit area of the second tapered portion 11. After the convex portion 37 is formed, the top lid portion 2, the tapered portion 3, and the second tapered portion 11, which are heat-sealed and joined, are conveyed to the fifth machining station 65.

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

Further, the paper-made lid 1 can provide a further effect of improving the heat retaining property of the contents in the container 20. The improvement of the heat retaining property obtained by the paper-made cover 1 of the fifth embodiment will be described below.

Fig. 18 is a diagram showing an example of joining the lid portion 2 and the engaging portion 12 of the paper-made lid 1 of 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 lid portion 2a (see fig. 10) of the engaging portion 12 and the top lid portion 2, and a space portion 26 does not exist between the top lid portion 2 and the top lid portion 2 a. Fig. 18(b) shows an example of bonding in which an adhesive 25 is applied to and bonded to the top lid portion 2a (see fig. 10) of the engaging portion 12 and the top lid portion 2, and a space portion 26 is present. Fig. 18 c shows an example of bonding in which an adhesive 25 is applied to and bonded to the outer periphery of the top lid portion 2a (see fig. 10) of the engaging portion 12 and the top lid portion 2, and a space portion 26 is present.

150cc of water (content) of 75 ℃ was poured into a 5-ounce container 20, and a heat retention test was performed to measure the temperature of the water (content) per elapsed time in a state in which the paper lid 1 was fitted. Further, tests were conducted in both a state in which the drinking hole 5 was closed and a state in which the drinking hole 5 was opened.

In addition, as a comparative example, measurement was also performed using a cap made of a plastic material which has been used so far. Since this plastic cap is not a type in which the cap portion 2 and the engaging portion 12 are joined, there is no adhesive portion.

[ Table 1]

As shown in table 1, the heat retaining property of the paper-made lid 1 was not inferior to that of the plastic-made lid used at present, and the heat retaining property of the measurement example in which the adhesive 25 was coated in the central portion and the measurement example in which the adhesive 25 was coated in the outer periphery was 1 to 2 ℃. This is because of the heat insulating effect of space portion 26. Thus, the heat retaining effect of the environmentally friendly paper-made cover 1 can be confirmed. The joining of the cap portion 2 and the engaging portion 12 is not limited to the adhesion, 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, or a part of the configuration may be omitted. Further, a part of the structure may be deformed, and for example, a notch may be added to the curl portion 9 to weaken the rigidity of the curl portion 9. The container 20 can be inserted from the outside using the curl portion 9 provided with the cutting groove. 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 bonding device (for example, a part holding the paper cover 1) may be heated to about 50 ℃ to 85 ℃ at the time of ultrasonic bonding. By heating the paper-made lid 1 in this manner, even when the contents of the container 20 are hot beverages (60 to 100 ℃), the paper-made lid 1 is not easily deformed into a shape before press working, and therefore, the risk of the paper-made lid 1 being detached from the container 20 can be reduced.

Further, 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 air flow type pulp in which pulverized pulp is laminated. In this case, the airlaid material has a weight per unit area of 20g/m²To 100g/m²Preferably 40g/m²To 60g/m²And (4) finishing. Further, it is desirable that: films (e.g., polyethylene films) are laminated on both sides of the airlaid and bonded by ultrasonic bonding. By using the air-laid member, the air-laid member can function as a cushion member or a seal member.

As such, various modifications can be made without departing from the spirit of the present invention.

Claims

1. A paper cover is characterized by comprising:

a lid body portion having a paper material and mounted on a container having an opening portion, a tapered shape, and a curl portion;

a first engaging portion provided in the lid main body portion and engaged with the curl portion from an outer side of the curl portion at a portion overlapping with the paper-based material; and

and a body-side curled portion provided on the lid body and located above the first engaging portion.

2. The paper cover according to claim 1,

the first engaging portion has a tapered shape in which a portion overlapping the paper material is bent.

3. The paper made cover according to claim 2,

the lid main body portion is provided with a top lid portion,

the bent portion of the tapered shape is joined to a portion of the lid portion.

4. The paper cover according to claim 1 or 2,

the lid main body portion is provided with a top lid portion,

the curl portion contacts the top cover portion when engaged with the first engaging portion.

5. The paper cover according to claim 1,

the size of the body-side curled portion is larger than the size of the curled portion of the container.

6. The paper cover according to claim 1,

the lid main body portion is provided with a top lid portion,

the cap body is provided with a visual confirmation unit for visually confirming the inside of the container.

7. The paper cover according to claim 6,

the visual confirmation unit is provided with a film.

8. The paper cover according to claim 6,

the size of the window portion is 5% to 50% of the area of the top lid portion.

9. The paper cover according to claim 1,

the lid main body portion is provided with a top lid portion,

a drinking opening is formed in the top lid portion.

10. The paper made cover according to claim 9,

the sealing device is provided with a sealing part,

the seal portion has:

a first engaging portion engaged with the drinking opening; and

a knob portion for opening the drinking opening.

11. The paper cover according to claim 10,

the sealing portion is sized to cover the drinking opening.

12. The paper cover according to claim 10,

the sealing portion has a second engaging portion that engages with the cover dome portion,

the engaging force of the first engaging portion is larger than the engaging force of the second engaging portion.

13. The paper cover according to claim 10,

the lid main body portion is provided with a top lid portion,

the height from the body-side curl portion to the lid top portion is 6 to 53% of the height of the lid main body portion.