JP2022182981A - Lid body and container - Google Patents

Abstract

To provide a lid body with reduced used amount of plastic material compared to the lid body molded so as to be fitted into an opening of a container body, and a container using the same.SOLUTION: A peripheral region 4b of a thermal shrinkage film 4 is shrunk by heat selectively and is adhered to a peripheral wall 2b of a container body 2 and sealed by irradiating infrared to an infrared absorption layer 5 formed at the peripheral region 4b around a covered region 4a covering an opening of the container body 2 of the thermal shrinkage film 4 of a lid body 3 and generating heat.SELECTED DRAWING: Figure 1

Description

The present invention relates to a container and a lid that covers an opening of a container body.

For example, in the delivery service of various cooked foods such as noodles such as pasta, ramen and udon, and rice dishes such as fried rice, or in the sale of take-out food and beverages at convenience stores, fast food restaurants, etc. A molded plastic lid is removably fitted to the opening of the container body to prevent the food from spilling when it is filled with food and drink and delivered or carried around (for example, patent Reference 1).

JP 2015-145281 A

In recent years, due to problems such as marine pollution, there has been a demand to reduce the amount of plastic materials used. A reduction in the amount of material used is required.

The present invention has been made by paying attention to such circumstances, and a lid which uses less plastic material than a lid which is molded so as to fit into an opening of a container body, and a lid therefor. The object is to provide a container comprising

In order to achieve the above object, the present invention is configured as follows.

(1) A lid according to the present invention is a lid that covers an upper opening of a container body, and includes a heat-shrinkable film that shrinks when heated and an infrared absorption layer that absorbs infrared rays.

According to the lid of the present invention, the infrared absorbing layer irradiated with infrared rays absorbs the infrared rays and generates heat. Therefore, by irradiating the infrared absorbing layer corresponding to the required area of the heat-shrinkable film with infrared rays to generate heat, the heat-shrinkable film in the required area can be thermally shrunk. As a result, as a required region, for example, the region surrounding the region covering the opening of the heat-shrinkable film placed so as to cover the opening of the container body is thermally shrunk so that it is brought into close contact with the outer peripheral surface of the peripheral wall of the container body. It is possible to seal the

Since the opening of the container body can be closed by the lid comprising the heat-shrinkable film and the infrared absorbing layer, it is not necessary to mold the lid according to the opening of the container body from a plastic material. The amount used can be reduced.

(2) In one embodiment of the present invention, the infrared absorbing layer is formed on at least one of both surfaces of the heat-shrinkable film.

According to this embodiment, the infrared absorbing layer formed on at least one surface of the heat-shrinkable film is irradiated with infrared rays to generate heat, thereby efficiently heating and shrinking the heat-shrinkable film. can.

(3) In another embodiment of the present invention, the infrared absorbing layer is formed by applying ink containing an infrared absorbing agent to at least one surface of the heat-shrinkable film.

According to this embodiment, the infrared absorbing layer can be easily formed by applying an ink containing an infrared absorbing agent to at least one surface of the heat-shrinkable film.

(4) In a preferred embodiment of the present invention, the heat-shrinkable film has a covering area covering the opening of the container body and a peripheral area around the covering area, and the infrared absorbing layer includes the It is formed on at least the peripheral region of the heat-shrinkable film.

According to this embodiment, since the infrared absorbing layer is formed at least in the peripheral area around the covering area, heat generated by the infrared absorbing layer irradiated with infrared rays heats the surrounding area around the covering area covering the opening of the container body. The heat-shrinkable film in the region can be heat-shrunk to tightly adhere to the outer peripheral surface of the peripheral wall around the opening of the container body for sealing.

In this way, the heat-shrinkable film in the peripheral region is heat-shrunk and tightly adhered to the outer peripheral surface of the peripheral wall around the opening of the container body for sealing. Although it is preferable to be formed in the peripheral region, it does not necessarily have to be formed in the entire peripheral region.

(5) In one embodiment of the present invention, the infrared absorbing layer is annularly formed so as to surround the central portion of the covered region of the heat-shrinkable film.

According to this embodiment, the infrared absorbing layer is formed in a ring shape so as to surround the central portion of the covering area of the heat-shrinkable film. By heat-shrinking the heat-shrinkable film around the covered area covering the container body, the heat-shrinkable film can be brought into close contact with the entire circumference of the peripheral wall of the container body.

(6) In another embodiment of the present invention, the outer shape of the heat-shrinkable film is a circle or a polygon with octagons or more.

According to this embodiment, the external shape of the heat-shrinkable film is circular or octagonal or more polygonal, so that the infrared absorption layer formed in the peripheral region of the heat-shrinkable film is irradiated with infrared rays to generate heat, When the heat-shrinkable film in the peripheral region heat-shrinks and adheres to the outer peripheral surface of the peripheral wall of the container body, the outer peripheral edge of the heat-shrinkable film is in close contact with the entire periphery of the peripheral wall of the container body to a substantially equal position. , can be evenly sealed along the circumference.

(7) In one embodiment of the present invention, the heat-shrinkable film has a knob portion in which a portion of the peripheral region protrudes outward.

Since the heat-shrinkable film after heat-shrinking is harder than it was before heat-shrinking, in order to keep the gripping portion in the soft state before heat-shrinking, the gripping portion should be heated by infrared irradiation. Although it is preferable not to form an infrared absorbing layer that does not absorb heat, an infrared absorbing layer may be formed.

According to this embodiment, the heat-shrinkable film has an outwardly protruding knob portion in a portion of the peripheral region around the covered region, so that when it is heat-shrunk and tightly adheres to the outer peripheral surface of the peripheral wall of the container body, , the knob protrudes from a part of the outer peripheral edge of the heat-shrinkable film. As a result, the heat-shrinkable film covering the opening of the container main body can be peeled off from the peripheral wall of the container main body by pinching the knob portion with fingers to open the container.

(8) In another embodiment of the present invention, the heat-shrinkable film has a large number of cuts along the circumferential direction at the outer peripheral edge of the peripheral region.

According to this embodiment, when the peripheral region of the heat-shrinkable film is heat-shrunk and tightly adheres to the outer peripheral surface of the peripheral wall of the container body, the heat-shrinkable film between the adjacent cuts is heat-shrunk, resulting in the formation of each cut. Since a large number of portions that are widened and easily picked up with fingers are formed along the circumferential direction, the portions can be used as the gripping portion.

(9) In one embodiment of the present invention, the heat-shrinkable film is provided with a breaking line for breaking the heat-shrinkable film.

According to this embodiment, the heat-shrinkable film, which has been heat-shrunk and adheres tightly to the outer peripheral surface of the peripheral wall of the container body, can be broken along the breaking line to open the package.

(10) In another embodiment of the present invention, the breaking lines are perforations.

According to this embodiment, the heat-shrinkable film can be easily torn along the perforations.

(11) In one embodiment of the present invention, the outer shape of the heat-shrinkable film is quadrilateral.

According to this embodiment, the outer shape of the heat-shrinkable film is a rectangle surrounded by straight lines, which is easier to manufacture than when the outer shape of the heat-shrinkable film is circular, thereby reducing the manufacturing cost. be able to.

(12) In a preferred embodiment of the present invention, the quadrangle is a square or a rectangle.

According to this embodiment, the heat-shrinkable film is square or rectangular with four right-angled corners, which is easier to manufacture and effective in reducing manufacturing costs.

(13) In another embodiment of the present invention, the square corners of the heat-shrinkable film are non-formation regions where the infrared absorbing layer is not formed.

Unlike a circular heat-shrinkable film, a square-shaped heat-shrinkable film does not have a constant length from the center of the square to the outer edge. When the container body is covered and heat-shrunk so that the It will protrude slightly outward. When the heat-shrinkable film is heat-shrunk, it becomes harder than it was before heat-shrinking. Therefore, if the hardened corners protrude outward, it is easy for fingers to accidentally touch the film, which is not preferable.

According to this embodiment, since the corners of the quadrangle are non-formation regions where no infrared absorption layer is formed, even when irradiated with infrared rays, no heat is generated and therefore no heat shrinkage occurs. is placed on the container body so as to cover the opening at the top of the container body and is heat-shrunk, the outwardly protruding corners remain soft and hardened due to heat shrinkage. Fingers do not touch the corners of the film.

(14) In still another embodiment of the present invention, the heat-shrinkable film is provided with a breaking line for breaking the heat-shrinkable film.

According to this embodiment, the heat-shrinkable film, which has been heat-shrunk and adheres tightly to the outer peripheral surface of the peripheral wall of the container body, can be broken along the breaking line to open the package.

(15) In another embodiment of the present invention, the breaking lines are perforations.

According to this embodiment, the heat-shrinkable film can be easily torn along the perforations.

(16) In still another embodiment of the present invention, in the heat-shrinkable film, the breaking line extends through at least a pair of opposing sides through the center of the square of the heat-shrinkable film. It is formed linearly.

When a rectangular heat-shrinkable film is placed over the container body so that the central portion of the heat-shrinkable film covers the opening at the top of the container body and is heat-shrunk, the central portion of the heat-shrinkable film forms a top surface that closes the opening of the container body. configure. Therefore, the straight breaking line formed so as to pass through the central portion of the quadrangular heat-shrinkable film crosses the top surface.

According to this embodiment, it is possible to push open the top face downward by pressing down on both sides of the linear break line across the top face and breaking it along the break line.

(17) In another embodiment of the present invention, the heat-shrinkable film has the breaking line formed linearly from the corners of the square to the center of the heat-shrinkable film.

The corners of the rectangular heat-shrinkable film adhere tightly to the outer peripheral surface of the peripheral wall of the container body when the heat-shrinkable film is placed over the container body so that the central portion of the heat-shrinkable film covers the opening at the top of the container body and is heat shrunk. It is positioned at the outer peripheral edge of the heat-shrinkable film.

According to this embodiment, from the beginning of the break line at the outer peripheral edge of the heat-shrinkable film that is in close contact with the outer peripheral surface of the peripheral wall of the container body, to the central portion of the heat-shrinkable film, that is, to the top surface that closes the opening of the container body. It can be opened by tearing the heat-shrinkable film along the tear line.

(18) In a preferred embodiment of the present invention, the heat-shrinkable film has at least two straight breaking lines extending between at least a pair of opposing sides of the quadrangle.

According to this embodiment, the portion sandwiched between two straight breaking lines formed between a pair of opposing sides of the rectangular heat-shrinkable film is broken along the two breaking lines. The heat-shrinkable film, which is heat-shrunk and closely adheres to the outer peripheral surface of the peripheral wall of the container body, can be opened by separating the container body.

(19) In another embodiment of the present invention, the heat-shrinkable film has at least two straight breaking lines connecting at least a pair of opposing corners of the quadrangle.

According to this embodiment, the portion sandwiched between two straight breaking lines connecting a pair of corners of the rectangular heat-shrinkable film is broken along the two breaking lines. The heat-shrinkable film, which is heat-shrunk and adheres tightly to the outer peripheral surface of the peripheral wall of the container body, can be opened by separating the container body.

(20) In another embodiment of the present invention, the two breaking lines are parallel to each other, and the band-shaped portion sandwiched between the two breaking lines covers the opening at the top of the container body. It is an opening piece for opening the lid attached to the container body.

According to this embodiment, by pulling up a strip-shaped opening piece sandwiched between two straight tear lines parallel to each other formed in the heat-shrinkable film, the opening can be opened along the two tear lines. The pieces can be separated and opened.

(21) In still another embodiment of the present invention, the heat-shrinkable film is positioned closer to each of the pair of opposite sides of the quadrangle than the central portion of the quadrangle, and the other pair of It has at least two straight breaking lines extending between the opposing sides.

According to this embodiment, when the rectangular heat-shrinkable film is put over the container body so as to cover the opening at the top of the container body and heat-shrunk it, and is brought into close contact with the outer peripheral surface of the peripheral wall of the container body, heat The ends of the fracture lines formed so as to be close to the opposite sides of the shrinkable film are located on the outer peripheral surface of the peripheral wall of the container body, and the heat-shrinkable film is in close contact with the peripheral wall of the container body. The heat-shrinkable film can be ruptured from the beginning of each rupture line on the outer peripheral edge to open the package.

(22) A container according to the present invention comprises a container body having an opening at the top, and the lid according to any one of the above (1) to (21) covering the opening of the container body.

According to the container of the present invention, the infrared-absorbing layer of the lid irradiated with infrared rays absorbs the infrared rays and generates heat, so that the heat-shrinkable film of the lid can be thermally shrunk by the generated heat.

Therefore, by irradiating the infrared absorbing layer corresponding to the required area of the heat-shrinkable film with infrared rays to generate heat, the heat-shrinkable film in the required area can be thermally shrunk. As a result, as a required region, for example, the region surrounding the region covering the opening of the heat-shrinkable film placed so as to cover the opening of the container body is thermally shrunk so that it is brought into close contact with the outer peripheral surface of the peripheral wall of the container body. It is possible to seal the

Since the opening of the container body can be closed by the lid comprising the heat-shrinkable film and the infrared absorbing layer, it is not necessary to mold the lid according to the opening of the container body from a plastic material. The amount used can be reduced.

(23) In one embodiment of the present invention, the container body has a peripheral wall around the opening in the upper part, and the heat-shrinkable film covers the opening of the container body and heat-shrinks the container. It is in close contact with the outer peripheral surface of the peripheral wall of the main body.

According to this embodiment, the heat-shrinkable film covering the opening of the container body is heat-shrunk by the infrared absorbing layer which is heated by being irradiated with infrared rays, so that it can be brought into close contact with the peripheral wall around the opening of the container body for sealing. can.

According to the present invention, since the opening of the container body can be closed by the lid comprising the heat-shrinkable film and the infrared absorbing layer, there is no need to mold the lid corresponding to the opening of the container body with a plastic material. The amount of plastic material used can be reduced.

FIG. 1 is a perspective view of a container according to one embodiment of the invention. FIG. 2 is a perspective view before attaching the lid to the container body. 3 is a plan view showing the lid of FIG. 2. FIG. FIG. 4 is a partially enlarged sectional view of the lid. FIG. 5 is a perspective view for explaining the procedure for attaching the lid to the container body. FIG. 6 is a schematic cross-sectional view for explaining the procedure for attaching the lid to the container body. FIG. 7 is a plan view showing a lid according to another embodiment of the invention. FIG. 8 is a perspective view of a container in which the lid of the embodiment of FIG. 7 is attached to the container body. FIG. 9 is a plan view showing a lid according to still another embodiment of the present invention. FIG. 10 is a diagram for explaining the state of supplying the lid. FIG. 11 is a plan view showing a lid according to another embodiment of the invention. FIG. 12 is a perspective view of a container in which the lid of the embodiment of FIG. 11 is attached to the container body. FIG. 13 is a plan view showing a lid according to another embodiment of the invention. FIG. 14 is a plan view showing a lid according to still another embodiment of the invention. 15 is a perspective view of a container in which the lid of the embodiment of FIG. 14 is attached to the container body. FIG. FIG. 16 is a plan view showing a lid according to another embodiment of the invention. FIG. 17 is a plan view showing a lid according to still another embodiment of the invention. FIG. 18 is a plan view showing a lid according to another embodiment of the invention. FIG. 19 is a plan view of a lid according to still another embodiment of the invention. FIG. 20 is a plan view of a lid according to another embodiment of the invention. FIG. 21 is a plan view of a lid according to still another embodiment of the invention. FIG. 22 is a plan view of a lid according to another embodiment of the invention. FIG. 23 is a plan view of a lid according to another embodiment of the invention. 24 is a partially enlarged cross-sectional view of the lid of FIG. 23. FIG. FIG. 25 is a schematic cross-sectional view for explaining the procedure for attaching the lid of FIG. 23 to the container body. FIG. 26 is a plan view of a lid according to another embodiment of the invention. FIG. 27 is a plan view of a lid according to another embodiment of the invention. FIG. 28 is a diagram for explaining the state of supplying the lid. Figure 29 is a perspective view of a container according to another embodiment of the invention;

An embodiment of the present invention will be described below with reference to the drawings.

1 is a perspective view of a container according to one embodiment of the present invention, FIG. 2 is a perspective view showing a state before the lid is attached to the container body, and FIG. 3 is the lid of FIG. and FIG. 4 is a partially enlarged cross-sectional view of the lid.

The container 1 of this embodiment includes a container body 2 having an opening 2a at the top, and a lid 3 that covers and seals the opening 2a of the container body 2. As shown in FIG.

As shown in FIG. 2, the container body 2 has an opening 2a at the top and a peripheral wall 2b that rises obliquely upward from the outer peripheral portion of the bottom wall around the opening 2a. Contents (not shown) such as cooked food are accommodated in the container body 2, and the upper opening 2a is closed by the lid 3 as described later.

As shown in the cross-sectional view of FIG. 4, the lid 3 is constructed by partially forming an infrared absorbing layer 5 on one side of a heat-shrinkable film 4 that shrinks when heated, in this example, on the upper surface. As will be described later, the infrared absorption layer 5 contains carbon black and is black. In FIGS. 1 to 3 and each figure described later, the black infrared absorption layer 5 is hatched.

As shown in FIG. 3, the heat-shrinkable film 4 of this embodiment has a circular outer shape in plan view, and includes a circular covering region 4a covering the circular opening 2a of the container body 2 and an annular covering region 4a surrounding it. and a peripheral region 4b. In addition, in FIG. 3, the boundary between the covering area 4a and the peripheral area 4b is indicated by a dashed line.

The infrared absorbing layer 5 is annularly formed over the peripheral region 4b of the heat-shrinkable film 4 and part of the covering region 4a on the inner peripheral side thereof. Therefore, the heat-shrinkable film 4 is exposed in the circular covered area 4a of the heat-shrinkable film 4 except for a portion of the outer circumference.

The heat-shrinkable film 4 is a shrink film that shrinks when heated. The heat-shrinkable film 4 is, for example, a uniaxially stretched polyethylene film (PE). be.

The heat-shrinkable film 4 is not limited to a uniaxially stretched polyethylene film. ) film, or a hybrid heat-shrinkable film, which is a laminated system of PS (polystyrene) and PET (polyethylene terephthalate), can be used. may

The material, thickness, etc. of the heat-shrinkable film 4 are appropriately selected according to the use of the container 1 and the like.

As described above, the circular covering region 4a of the heat-shrinkable film 4 covering the opening 2a of the container body 2 is covered by the heat-shrinkable film 4 except for a portion of the outer peripheral side where the infrared absorption layer 5 is formed. is exposed. Therefore, the contents contained in the container body 2 can be visually confirmed through the transparent heat-shrinkable film 4 of the covering area 4a.

In the region of the covering region 4a where the infrared absorption layer 5 is not formed, information, design, etc., regarding the contents may be printed. Since the area where the infrared absorbing layer 5 is not formed is an area where the heat-shrinkable film 4 does not heat-shrink as will be described later, printed information and the like are not deformed by heat.

In this embodiment, the infrared absorbing layer 5 is formed on one side of the heat-shrinkable film 4 by printing such as letterpress printing or gravure printing. Formation of the infrared absorption layer 5 is not limited to printing, and may be formed by coating the heat-shrinkable film 4 with a coater or the like. In addition, the infrared absorption layer 5 may be formed on both sides of the heat-shrinkable film 4 .

Next, a procedure for closing the opening 2a of the container body 2 by attaching the lid 3 to the top of the container body 2 containing the contents such as cooked food will be described with reference to FIGS. 5 and 6. do.

First, the cover 3 is positioned so that the covering area 4a of the heat-shrinkable film 4 covers the opening 2a of the container body 2, and placed on the upper end of the container body 2 containing the contents. Furthermore, a pressing member 6 for pressing the lid 3 against the container body 2 is placed on the lid 3 . In this embodiment, a rectangular transparent glass plate is used as the pressing member 6 .

In the state shown in FIG. 6 in which the lid 3 and the pressing member 6 are placed on the container body 2, the outer peripheral portion of the lid 3, that is, the peripheral region 4b of the heat-shrinkable film 4 where the infrared absorption layer 5 is formed. protrudes outside the opening 2a of the container body 2 and hangs downward.

In this state, light is emitted from a light source such as a halogen lamp or an incandescent lamp (not shown) as indicated by an arrow A for, for example, several seconds to ten and several seconds. Light from the light source is applied directly or after being reflected by a mirror.

The infrared absorbing layer 5 formed on the peripheral area 4b and part of the outer peripheral side of the covering area 4a of the heat-shrinkable film 4 of the lid 3 irradiated with light absorbs the infrared rays and generates heat. Due to the heat generated by the infrared absorption layer 5, the peripheral region 4b of the heat-shrinkable film 4, which protrudes outside the opening 2a of the container body 2 not pressed by the pressing member 6 and hangs down, mainly shrinks.

At this time, the peripheral region 4b of the heat-shrinkable film 4 protruding outside the opening 2a of the container body 2 and hanging downward is directed toward the container body 2 inward, and extends to the outer peripheral surface of the peripheral wall 2b of the container body 2. shrinks upward along the

As a result, as shown in FIG. 1, the peripheral region 4b of the heat-shrinkable film 4 of the lid 3 where the infrared absorption layer 5 is formed extends over the entire outer peripheral surface of the upper peripheral wall 2b of the container body 2. can be tightly sealed.

In this manner, the lid 3 is placed on the container body 2 so as to cover the opening 2a, the pressing member 6 is placed thereon, and the infrared absorption layer 5 is irradiated with infrared rays to heat the heat-shrinkable film 4. As shown in FIG. As a result, mainly the peripheral region 4b of the heat-shrinkable film 4 protruding to the outside of the container body 2 that is not pressed by the pressing member 6 is thermally shrunk, and the outer peripheral surface of the upper peripheral wall 2b of the container body 2 is covered with heat. , can close the opening 2a.

5 and 6, the infrared absorption layer 5 is formed on the upper surface of the heat-shrinkable film 4, and the surface of the heat-shrinkable film 4 on which the infrared absorption layer 5 is formed is pressed by the pressing member 6. example is shown. On the other hand, even if the upper and lower surfaces of the lid 3 are turned upside down and the surface of the heat-shrinkable film 4 on which the infrared absorption layer 5 is not formed is pressed by the pressing member 6, the container body 2 is similarly removed. The peripheral region 4b of the heat-shrinkable film 4 protruding outside the opening 2a and hanging downward can be thermally shrunk and brought into close contact with the outer peripheral surface of the peripheral wall 2b of the container body 2. As shown in FIG.

Since the opening 2a of the container body 2 can be covered and sealed regardless of whether the infrared absorbing layer 5 is formed on the upper or lower surface of the heat-shrinkable film 4, any surface can be selected. However, for example, when the content of the container body 2 is food, the surface facing the food is preferably a surface on which the infrared absorption layer 5 is not formed. Alternatively, the surface facing the contents may be the surface on which the infrared absorption layer 5 is formed.

In this embodiment, since the infrared absorbing layer 5 is formed by printing ink containing carbon black as an infrared absorbing agent, the black infrared absorbing layer 5 efficiently absorbs infrared rays to generate heat. Thereby, the heat-shrinkable film 4 can be efficiently heated and shrunk.

The container 1 sealed by the lid 3 in this way is pulled upward by pinching the lower outer peripheral edge of the heat-shrinkable film 4, which is in close contact with the outer peripheral surface of the upper peripheral wall 2b of the container body 2, with fingers. It can be opened by peeling it off.

Since the lid 3 only needs to secure an area that can be brought into close contact with the peripheral wall 2b around the opening 2a of the container body 2, the lid 3 of the same size can be used even if the container body has a slightly different size of the opening 2a of the container body 2. can be used in combination.

As described above, according to this embodiment, the opening 2a of the container body 2 can be closed by the lid 3 made of the heat-shrinkable film 4 on which the infrared absorption layer 5 is formed. The body does not need to be molded with plastic material, and the amount of plastic material used can be reduced.

FIG. 7 is a plan view showing a lid body _3-1 of another embodiment of the present invention, and FIG. 8 is a perspective view of a container ₁₁ to which this lid body _3-1 is attached.

In the lid body ₃₁ of this embodiment, as shown in FIG. 7, a knob portion 7 projecting outward is formed at one point of the peripheral region 4b around the covering region 4a of the heat-shrinkable film 4. there is As with the lid ₃ of the above-described embodiment, the lid 31 also heat-shrinks the peripheral region 4b of the heat-shrinkable film 4 so that, as shown in FIG. , the opening 2a of the container body 2 can be closed.

In the container _1-1 to which the lid _3-1 is attached and sealed, the grip portion 7 extends downward from a portion of the outer peripheral edge of the heat-shrinkable film 4 that is in close contact with the outer peripheral surface of the peripheral wall 2b of the container body 2. ing. By pinching the knob 7 with fingers, the heat-shrinkable film 4 of the lid ₃₁ attached to the container body 2 can be peeled upward from the container body 2 to easily open the package.

Although the infrared absorbing layer 5 is formed on the knob portion 7 in FIG. 7 , the infrared absorbing layer 5 may not be formed on the knob portion 7 . In this case, since the knob 7 does not heat shrink and does not adhere to the container body 2, the lid ₃₁ can be peeled upward from the container body 2 by easily picking the knob 7 with fingers.

In the lid body ₃₁ of this embodiment, the knob portion 7 projecting outward from the peripheral region 4b of the _heat -shrinkable film 4 is formed. , a large number of cuts 8 may be formed in the outer peripheral edge of the peripheral region 4b of the heat-shrinkable film 4 along the circumferential direction toward the center. In the lid ₃₂ , when the heat-shrinkable film 4 is heat-shrunk and brought into close contact with the outer peripheral surface of the peripheral wall 2b of the container body 2, the heat-shrinkable film 4 between the adjacent cuts 8 shrinks. As a result, each notch 8 is opened, so that it is easy to pick it up with fingers and pull it upward to open it.

As described with reference to FIGS. 5 and 6, the lid 3 is attached to the container body 2 containing the contents such as cooked food to close the opening 2a of the container body 2. This lid The attachment of the body 3 is preferably carried out by using a dedicated attachment device, for example. In the mounting device, for example, the container body 2 containing contents such as cooked food is set at a predetermined position.

Next, the lid 3 is automatically supplied to the upper end of the container body 2, the pressing member 6 is lowered to press the lid 3 against the container body 2, and in this state, a light source such as a halogen lamp or an incandescent lamp is turned on. is irradiated with light for a predetermined period of time. As a result, the lid body 3 is thermally shrunk as described above, and is brought into close contact with the peripheral wall 2b of the container body 2 for sealing. After that, the pressing member 6 is raised to allow the container 1 sealed by the lid 3 to be taken out.

In this case, for example, as shown in FIG. 10, the lid body 3 is formed by winding a continuous body of a large number of lid bodies 3 in which a part of the peripheral region 4b of the heat-shrinkable film 4 is connected. It is preferable to feed and cut the sheet one by one with a roll.

In the case of the lid ₃₁ having the knob 7, the knob 7 indicated by the phantom line does not exceed the width W of the heat-shrinkable film 4 in the direction perpendicular to the supply direction (horizontal direction in FIG. 10). In order to stably supply and guide the lid body ₃₁ , it is preferable to form it as follows.

The supply of the lid body 3 and the like is not limited to the roll method, and may be performed by a single substrate method.

In each of the above embodiments, the outer shape of the heat-shrinkable film 4 of the lids 3, _{3 1} , 3 ₂ before heat shrinkage was circular. A quadrangle surrounded by straight lines, particularly a square or a rectangle, is preferable in terms of reducing the manufacturing cost.

FIG. 11 is a plan view of a lid body ₃₃ of another embodiment of the present invention, and is a plan view corresponding to FIG. 3 of the above embodiment.

In this embodiment, the outer shape of the heat-shrinkable film 9 forming the lid ₃₃ in a plan view is a quadrangle, in this example a square. This heat-shrinkable film 9 has a circular covering area 9a covering the circular opening 2a of the container body 2 and a peripheral area 9b surrounding it. In addition, in FIG. 11, the boundary between the covering area 9a and the peripheral area 9b is indicated by a dashed line.

In the heat-shrinkable film 4 of each embodiment described above, the infrared absorbing layer 5 is formed on the entire region other than the circular covering region 4a. On the other hand, in the square heat-shrinkable film 9 of this embodiment, the triangular regions of the four corners 9c of the square, out of the regions other than the circular covered region 9a, are covered with the black infrared absorbing layer 5. It is defined as a non-formation region where no formation is made. In this non-formation region, the heat-shrinkable film 9 is exposed and transparent.

Unlike the lids 3, _{3 1} and _{3 2 made} of the circular heat-shrinkable film 4 of the above embodiments, the lid 3-3 made of the square heat-shrinkable film 9 covers the opening 2a of the container body 2. The length from the center of the covering area 9a to the outer peripheral edge is not constant. Therefore, when the container body 2 is brought into close contact with the outer peripheral surface of the upper peripheral wall 2b of the container body 2 by irradiating it with light from a light source such as a halogen lamp, the length from the center to the outer peripheral end is different from the other. The corner portion 9c, which is longer than the portion, does not sufficiently adhere to the peripheral wall 2b of the container body 2, and protrudes slightly outward from the peripheral wall 2b.

Since the heat-shrinkable film 9 after heat-shrinking is harder than before heat-shrinking, if the hardened corners 9c protrude outward from the peripheral wall 2b of the container body 2, they may inadvertently come into contact with fingers. Easy and unfavorable.

In the heat-shrinkable film 9 of this embodiment, each corner 9c of the square is formed as a triangular non-formation region where the infrared absorbing layer 5 is not formed, as described above. In this example, the non-forming area of each corner 9c is an isosceles triangle, and the length L of the equilateral side along one side of the square shown in FIG. 11 is, for example, 20 mm to 45 mm, preferably about 30 mm. . Note that the non-formation area is not limited to a triangular shape, and may have an arc-shaped base, a square, or any other shape.

Since the corners 9c of the heat-shrinkable film 9 are formed as non-formation regions in which the infrared absorption layer 5 is not formed, the corners 9c do not generate heat even when irradiated with light, and therefore thermally shrink. Not at all.

In the lid ₃₃ of this embodiment, the outer shape of the heat-shrinkable film 9 is a square, and each corner 9c is a non-formation region where the infrared absorption layer 5 is not formed. The configuration of the lid 3 of the heat-shrinkable film 4 having a circular outer shape in FIG. 3 is the same.

FIG. 12 is a perspective view of the container _{13 in which the lid 33 of} FIG.

As shown in FIG. 12, transparent corners 9c of the heat-shrinkable film 9 where the infrared absorption layer 5 is not formed project slightly outward from the outer peripheral surface of the peripheral wall 2b of the container body 2. Since it is not heat shrunk, it remains in a soft film state. As a result, fingers do not accidentally touch the corners of the heat-shrinkable film that have hardened due to heat-shrinkage.

FIG. 13 is a plan view of a lid body ₃₄ of another embodiment of the present invention, which is a modification of the embodiment of FIG. 11 above.

In the heat-shrinkable film 9 constituting the lid ₃₄ of this embodiment, when the lid _3-3 is thermally shrunk and attached to the container body 2, the lid _3-3 can be easily opened as follows. It is configured as

That is, in the square heat-shrinkable film 9, a perforation 10 as a breaking line dividing the square into two is formed in a straight line between a pair of upper and lower opposing sides 12 and 13 through the center of the square. It is

The central portion is defined as the range of a rectangle from the center of the rectangle to a length of D/2, for example, where D is the distance from the center of the rectangle to each side.

When this square heat-shrinkable film 9 is put over the container body 2 so as to cover the upper opening 2a of the container body 2 with the covering region 4a at the center and heat-shrinks, the center of the heat-shrinkable film 9 is The covering area 4a of 1 constitutes a top surface that closes the opening 2a of the container body 2. As shown in FIG. Therefore, the perforation 10 that divides the square heat-shrinkable film 9 into two halves vertically crosses the top surface that closes the opening 2a of the container body 2 in FIG.

In this embodiment, the heat-shrinkable film 9 attached to the container body 2 is pushed down from both sides of the perforation 10 near the center of the top surface of the heat-shrinkable film 9, in FIG. By breaking the perforation 10 between them, the top surface can be pushed open downward to open.

Other configurations are the same as those of the embodiment of FIG.

FIG. 14 is a plan view of a lid ₃₅ according to another embodiment of the invention.

As _{described above, the lid body 34 of} the embodiment shown in FIG. The perforations 10 are broken and pushed open downward. Therefore, in the case where the lower surface of the heat-shrinkable film 9 is printed, there is a risk that the print on the lower surface of the heat-shrinkable film 9 that is pushed open downward and broken may come into contact with the contents of the container. There is

In this embodiment, two parallel perforations 10, 10 are formed in the square heat-shrinkable film 9 between a pair of upper and lower opposing sides 12, 13 through the center of the square. ing. A belt-like portion sandwiched between the two parallel perforations 10, 10 is used as an opening piece 11 for opening the lid ₃₅ mounted to cover the opening 2a of the container body 2. - 特許庁

That is, the band-shaped opening piece 11 of the heat-shrinkable film 9 of the lid ₃₅ attached so as to cover the opening 2a of the container body 2 is pinched at either end of either end and pulled up. Then, the opening piece 11 is broken along the perforations 10, 10 to separate the opening piece 11, and the opening can be easily opened.

Furthermore, in this embodiment, as shown in FIG. 13, not only perforations 10 are formed in the heat-shrinkable film 9, but also perforations 10 are formed in the peripheral region 9b around the circular covered region 9a. A region where the eye 10 is formed is a transparent region where the infrared absorption layer 5 is not formed. The transparent area is elongated along the perforations 10 with a narrow width on both sides including each perforation 10 . As a result, the infrared absorbing layer in the portion sandwiched between the transparent regions of the opening piece 11 forms separated portions 11a, 11a separated from the infrared absorbing layer 5 in the peripheral region 9b.

In this manner, the black separation portions 11a, 11a at both ends of the opening piece 11 are defined by the surrounding transparent regions and become visually conspicuous regions. Therefore, as shown in FIG. 15, in the container ₁₅ in which the lid ₃₅ is attached to the container body 2, each longitudinal end of the opening piece 11 crossing the central portion of the top surface, that is, the opening piece 11 The separation portions 11a, 11a make it possible to easily recognize the position where the package should be opened by pinching the package with fingers, thereby facilitating the opening.

In addition, since the transparent region of the heat-shrinkable film 9 where the infrared absorption layer is not formed has a narrow width, and the separating portions 11a, 11a of the opening piece 11 are infrared absorption layers, the heat-shrinkable film 9 is heated. When it is shrunk and attached to the container body 2, it does not affect the close contact of the heat-shrinkable film 9 to the outer peripheral surface of the peripheral wall 2b of the container body 2. - 特許庁

As _a modified example of the lid _{35 of} FIG. 14, as _shown in FIG. By doing so, the two ends of the opening piece 11 may be visually recognized more easily.

FIG. 17 is a plan view of a lid ₃₇ of another embodiment of the invention.

In the lid body ₃₇ of this embodiment, two parallel perforations 10, 10 are obliquely formed to connect two opposing corners 9c, 9c of the square heat-shrinkable film 9. A belt-like portion sandwiched between the perforations 10, 10 serves as an opening piece 11. - 特許庁Unlike the lid bodies ₃₅ and ₃₆ shown in FIGS. 14 and 16, this lid body ₃₇ does not have a transparent area in the area where the perforations 10 are formed, but a transparent area may be provided.

Each square corner portion 9c of the heat-shrinkable film 9 is a non-formation region where the infrared absorption layer 5 is not formed, so the transparent heat-shrinkable film 9 is exposed. Therefore, both ends of the opening piece 11 are located in the transparent region of the corner 9c, making it easy to recognize the both ends of the opening piece 11, which are the starting points of opening. Furthermore, since the corner portion 9c does not have the infrared absorption layer 5 formed thereon, it does not generate heat or shrink even when irradiated with infrared rays.

FIG. 18 is a plan view of a lid ₃₈ of another embodiment of the invention.

11 to 17, the perforations 10 are all central portions of the lids 3 ₄ to 3 ₇ . Therefore, the lids 3 ₄ to 3 ₇ attached to the container body 2 were formed so as to cross the top surface covering the opening 2a, but in this embodiment, they are in close contact with the outer peripheral surface of the peripheral wall 2b of the container body 2. The heat-shrinkable film 9 portion, that is, the peripheral portion of the heat-shrinkable film 9 attached to the container body 2 can be broken and opened as follows.

That is, in the heat-shrinkable film 9 of this embodiment, the two perforations 10, 10 are not located near the center of the square, but are adjacent to the pair of left and right opposing sides 14, 15, respectively. It is formed linearly along the sides 14 and 15 . One perforation 10 of the two perforations 10, 10 is formed along one opposing side 14 so as to connect corners 9c, 9c at both ends of one opposing side 14.例文帳に追加The other perforation 10 of the two perforations 10, 10 is formed along the other opposing side 15 so as to connect corners 9c, 9c at both ends of the other opposing side 15. As shown in FIG.

In this embodiment, an opening piece is not formed between the two perforations 10, 10, and a band-shaped opening that serves as a trigger for opening is provided between each of the perforations 10, 10 and the adjacent opposing sides 14, 15, respectively. are formed, respectively.

By pinching and pulling one end of one of the two broken pieces 16, 16, the heat-shrinkable film 9, which is in close contact with the outer peripheral surface of the upper peripheral wall 2b of the container body 2, is removed by the perforations. It is broken in the circumferential direction along 10 and opened.

Both ends of the broken pieces 16, 16 are not formed with an infrared absorption layer, so they are transparent, soft and easy to pick.

FIG. 19 is a plan view of lid body ₃₉ of another embodiment of the present invention.

In this embodiment, the two perforations 10, 10 are arranged at positions spaced apart from the pair of left and right opposing sides 14, 15, respectively, as compared with the cover body ₃₈ shown in FIG. , 15 parallel to each other.

Since the perforations 10, 10 are formed at positions near the center away from the opposing sides 14, 15 in this way, the transparent heat-shrinkable film 9 is formed on both ends of the linear perforations 10, 10. It will not be located at each of the four corners 9c of the exposed triangle.

In this embodiment, the infrared absorption layer 5 is formed in the region near the center of each of the four corners 9c and where both ends of the perforations 10, 10 are located, similarly to the corners 9c. It is referred to as a non-formation region 9d where no formation is made.

In this embodiment, the portions between the perforations 10, 10 and the adjacent opposing sides 14, 15 form wide tear pieces 16a, 16a that trigger opening.

In this embodiment, the perforations 10, 10 are formed at positions closer to the covering region 9a in the central portion, and the broken pieces 16a, 16a are wider than in the embodiment of FIG. As a result, when one end of one of the broken pieces 16a is pulled to break the lid body ₃₈ , which is in close contact with the outer peripheral surface of the peripheral wall 2b of the container body 2, along the perforations 10, the container body The heat-shrinkable film 9 can be reliably broken from the peripheral wall 2b of the container 2 toward the top surface covering the opening 2a, and the package can be easily opened.

18 and 19, the perforations 10 are formed parallel to each other along the opposite sides 14 and 15 of the heat-shrinkable film 9 in the lids ₃₈ and ₃₉ of FIGS. Alternatively, as shown in the lid body ₃₁₀ shown in FIG. 20, it may be formed so as to obliquely extend from each square corner 9c toward the central covering region 9a.

In this embodiment, the heat-shrinkable film 9 in close contact with the outer peripheral surface of the peripheral wall of the container body 2 is removed by pinching and pulling the vicinity of the apex of one of the four corners 9c at the perforations 10. , the upper top surface covering the opening 2a of the container body 2 can be efficiently broken along, and the container body 2 can be easily unsealed.

FIG. 21 is a plan view of a lid body ₃₁₁ of another embodiment of the present invention, which is a modification of the lid body ₃₁₃ of FIG.

In the lid bodies 3, _{3 1} to 3 ₁₀ of each of the above embodiments, a transparent region in which the infrared absorption layer 5 is not formed in the central circular covering region 9a and the infrared absorption layer 5 around it are formed. The black area is clearly demarcated by the presence or absence of the infrared absorption layer 5 as indicated by the boundary line 18 in FIG. The transparent area inside the boundary line 18 does not have the infrared absorbing layer 5, so there is no heat shrinkage due to heat generation, and the black area outside the boundary line 18 has the infrared absorbing layer 5, so heat shrinkage due to heat generation. will do.

Therefore, in the heat-shrinkable film ₉₁₁ , the change in stress in the vicinity of the boundary line 18 becomes large, and there is a possibility that distortion may occur.

In this embodiment, in order to reduce the change in stress near the boundary line 18, the amount of ink containing an infrared absorbing agent for forming the infrared absorbing layer ₅₁₁ applied to the heat-shrinkable film ₉₁₁ is adjusted to the outer peripheral side. , gradually decreases toward the inner circumference side, and the boundary is blurred. In this example, a portion of the outer peripheral side of the covered region _911a is a region where the amount of ink containing the infrared absorbing agent applied is small.

The area where the coating amount of the ink containing the infrared absorbing agent for forming the infrared absorbing layer ₅₁₁ is changed is widened, for example, as shown in FIG. The amount may be gradually reduced.

In the vicinity of the boundary line 18 between the transparent region where such infrared absorbing layers 5 ₁₁ and 5 ₁₂ are not formed and the black region where the infrared absorbing layers 5 ₁₁ and 5 ₁₂ are formed, an infrared absorbing agent is included Of course _, the configuration for changing the amount _of ink applied _is applicable not only to the lid ₃₃ of FIG _. .

FIG. 23 is a plan view of a lid body ₃₁₃ of another embodiment of the present invention, which is a modification of the lid body ₃₉ of FIG. 19 described above.

The ink for forming the infrared absorbing layer as described above contains carbon black as an infrared absorbing agent and is black, and most of the regions of the lids 3, _{3 1} , 3 ₂ , 3 ₄ to 3 ₁₂ are black. becomes. In order to improve aesthetics, it is desirable to be able to provide an appearance other than black even when using inks containing carbon black as an infrared absorber.

In this embodiment, as shown in FIG. 24, an infrared absorbing layer 5 is formed on one surface (lower surface) of the heat-shrinkable film 9, and the other surface (upper surface) is coated with a color other than black. In the example, a white printed layer 17 is formed. FIG. 23 shows the top side on which the white printed layer 17 is formed. The bottom side of the heat-shrinkable film 9 on which the infrared absorbing layer 5 is formed is the same as in FIG.

In the lid ₃₁₃ having the infrared absorbing layer 5 formed on the lower surface of the heat-shrinkable film 9 and the white printed layer 17 formed on the upper surface, the lid 3 is attached to the upper portion of the container body 2 in the following manner. ₁₃ is attached to seal the opening 2a of the container body 2. As shown in FIG.

That is, as shown in FIG. 25, the lid ₃₁₃ is placed so as to cover the opening 2a of the container body 2 so that the black infrared absorbing layer 5 of the heat-shrinkable film 9 faces downward. Furthermore, a pressing member 6 made of a rectangular transparent glass plate for pressing the lid ₃₁₃ against the container body 2 is placed on the lid ₃₁₃ .

In the state shown in FIG. 25 in which the lid ₃₁₃ and the pressing member 6 are placed on the container body 2, the outer peripheral portion of the lid ₃₁₃ , that is, a portion of the covering region 9a of the heat-shrinkable film 9 and the peripheral region 9b. The infrared absorption layer 5 formed in the container body 2 protrudes outside the opening 2a of the container body 2 and hangs downward.

In this state, a light source such as a halogen lamp or an incandescent lamp (not shown) irradiates the infrared absorbing layer 5 on the lower surface side from below as indicated by an arrow A for, for example, several seconds to ten-odd seconds.

The infrared absorbing layer 5 formed in the exposed area of the heat-shrinkable film 9 protruding outside the container body 2 absorbs infrared rays and generates heat. A region of the heat-shrinkable film 9 protruding outside the container body 2 heat-shrinks due to the heat generated by the infrared absorption layer 5 . At this time, the peripheral region 9b of the heat-shrinkable film 9, which protrudes outside the container body 2 and hangs down, extends upward along the outer peripheral surface of the peripheral wall 2b of the container body 2 toward the container body 2 inward. contract to

As a result, the peripheral region 9b of the heat-shrinkable film 9 of the lid ₃₁₃ where the infrared absorption layer 5 is formed can be brought into close contact with the outer peripheral surface of the peripheral wall 2b of the container body 2 for sealing.

Since the upper surface of the lid ₃₁₃ covering the opening 2a of the container body 2, that is, the top surface is a white printed layer 17, the black infrared absorption layer 5 on the lower surface side is not visible, and the white lid 3 recognized as ₉ .

In addition, as shown in FIG. 25, the heat-shrinkable film 9 can irradiate the infrared absorption layer 5 in the region protruding to the outside of the container body 2 to generate heat. The pressing member 6 for pressing is not limited to a transparent glass plate, and a metal plate or the like that does not transmit light may be used.

In the cover of the present invention, various decorative patterns and designs can be added by adjusting the coating amount of the ink for forming the printed layer other than black and the infrared absorption layer, thereby enhancing the design.

FIG. 26 is a plan view showing an example of a lid body ₃₁₄ having a decorative pattern to enhance its design.

In the heat-shrinkable film 9 of the lid ₃₁₄ of this embodiment, two linear perforations 10, 10 are formed parallel to each other on both sides so as to sandwich the center of the square. A wide and vertically long opening piece 11 is formed between the perforations 10, 10. - 特許庁

In this opening piece 11, triangles 19, 19 whose apexes are positioned toward the center are formed above and below the circular transparent covering region 9a so as to face each other. The opening direction of the opening piece 11 is shown.

The heat-shrinkable film 9 has a plurality of substantially isosceles triangles 20 radially formed around the transparent circular covering region 9a. is formed in The approximately isosceles triangle 20 is semi-transparent by reducing the amount of ink applied for forming the infrared absorbing layer.

As described above, in the present embodiment, the amount of ink applied for forming the infrared absorption layer is adjusted to form a triangular pattern, thereby improving the design.

In each of the above-described embodiments, a square heat-shrinkable film having a square outer shape has been described, but the lid of the present invention is not limited to a square, and may be heat-shrinkable as shown in FIG. The external shape of the elastic film 9 may be rectangular. In the lid ₃₁₅ of FIG. 27, the pair of left and right sides 14a and 15a of the two pairs of sides 12 and 13; is also a long rectangle.

In the lid body ₃₁₅ of this embodiment, the opening piece 11 sandwiched between the two perforations 10, 10 is formed so as to extend along the opposing long sides 14a, 15a. As a result, when the lid ₃₁₅ is thermally shrunk and attached to the container body 2, the opposite sides 12 and 13, which are the edges of both ends of the opening piece 11, extend below the peripheral wall 2b of the container body 2. It will be. As a result, the position of each end of the opening piece 11 can be easily recognized, so that the end of the opening piece 11 can be easily picked to open the package.

The lids 3 ₃ to 3 ₁₅ having a square or rectangular outer shape made of heat-shrinkable film are, for example, as shown in FIG. , and can be supplied and cut one by one with a roll. can be stably supplied and guided.

The shape, size, material, etc. of the container body 2 _may be appropriately selected according to the type and amount of contents to be contained. The cup-shaped container body 2 ₁₆ may be sealed by a lid body 3 ₁₆ having a circular outer shape and having an infrared absorption layer 5 ₁₆ formed on a part of the covered area 4 a and the peripheral area 4 b of the heat-shrinkable film 4 . .

The infrared absorbing layer may contain other materials (pigments, etc.) as long as a predetermined infrared absorption rate can be obtained, and the infrared absorbing agent (color is black, transparent, translucent, etc.) can absorb infrared rays. Although the material is not limited, it is particularly preferable to use at least one infrared absorbing agent selected from carbon black, titanium oxide, zinc oxide, phthalocyanine green and iron oxide.

The lid may be provided with other layers in addition to the printed layer.

In each of the above-described embodiments, the container body 2 and its opening 2a are circular in plan view, but the shape of the container body and its opening is not limited to circular in plan view, and may be square or other shapes. good.

In each of the above-described embodiments, the break line is a perforation, but it is not limited to the perforation, and may be a break line such as a half-cut line made up of continuous grooves.

Three or more perforations may be formed as breaking lines, and they may be formed in crossing directions, for example, between each pair of opposing sides of a quadrangle.

In addition, the breaking line is not limited to the lid body having a rectangular outer shape of the heat-shrinkable film, and may of course be formed on a circular lid body. may be formed.

The above-described embodiments may be combined as appropriate. For example, perforations ₁₀ near opposing sides 14 and 15 shown in FIG. , 10 may be added.

In each of the above-described embodiments, a square and a rectangle having four equal corners have been described as quadrilaterals.

1 _, 1 1 , 1 ₃ , 1 ₅ , 1 ₁₆ container 2, 2 ₁₆ container body 2a opening 2b peripheral wall 3, _{3 1} to 3 ₁₆ lid 4, 9, 9 ₁₁ , 9 ₁₂ heat-shrinkable film 4a, 9a, 9 ₁₁ a, 9 ₁₂ a covering area 4 b, 9 b, 9 ₁₁ b, 9 ₁₂ b peripheral area 5, _{5 11} , 5 ₁₂ , 5 ₁₆ infrared absorption layer 6 pressing member 10 perforation 11 opening piece

Claims (23)

A lid that covers the opening at the top of the container body,
Equipped with a heat-shrinkable film that shrinks when heated and an infrared absorbing layer that absorbs infrared rays,
A lid body characterized by: The infrared absorbing layer is formed on at least one of both surfaces of the heat-shrinkable film,
The lid according to claim 1. The infrared absorbing layer is formed by applying an ink containing an infrared absorbing agent to at least one surface of the heat-shrinkable film.
The lid according to claim 2. The heat-shrinkable film has a covering area covering the opening of the container body and a peripheral area around the covering area,
The infrared absorbing layer is formed in at least the peripheral region of the heat-shrinkable film,
The lid according to any one of claims 1 to 3. The infrared absorbing layer is formed in an annular shape so as to surround the central portion of the covered region of the heat-shrinkable film.
The lid according to claim 4. The outer shape of the heat-shrinkable film is circular or octagonal or more polygonal,
The lid according to claim 4 or 5. The heat-shrinkable film has a knob portion in which a part of the peripheral region protrudes outward.
The lid according to any one of claims 4 to 6. The heat-shrinkable film has a large number of cuts along the circumferential direction at the outer peripheral edge of the peripheral region.
The lid according to any one of claims 4 to 6. A breaking line for breaking the heat-shrinkable film is formed in the heat-shrinkable film,
The lid according to any one of claims 1 to 8. The lid according to claim 9, wherein the breaking lines are perforations. The outer shape of the heat-shrinkable film is a rectangle,
The lid according to any one of claims 1 to 5. the quadrangle is a square or a rectangle,
The lid according to claim 11. The square corners of the heat-shrinkable film are non-formation regions where the infrared absorbing layer is not formed.
The lid according to claim 11 or 12. A breaking line for breaking the heat-shrinkable film is formed in the heat-shrinkable film,
The lid according to any one of claims 11 to 13. 15. The lid according to claim 14, wherein the breaking lines are perforations. In the heat-shrinkable film, the breaking line is formed linearly across at least a pair of opposing sides through the center of the square of the heat-shrinkable film.
The lid according to claim 14 or 15. In the heat-shrinkable film, the breaking line is formed linearly from the corners of the square to the center of the heat-shrinkable film.
The lid according to claim 14 or 15. The heat-shrinkable film has at least two straight breaking lines extending between at least a pair of opposing sides of the quadrangle,
The lid according to claim 14 or 15. The heat-shrinkable film has at least two straight breaking lines connecting at least a pair of opposing corners of the quadrangle.
The lid according to claim 14 or 15. The lid is attached to the container body such that the two breaking lines are parallel to each other and the belt-like portion sandwiched between the two breaking lines covers the opening at the top of the container body. is an opening piece for opening the
The lid according to claim 18 or 19. The heat-shrinkable film is positioned closer to each of the pair of opposing sides of the quadrangle than the central portion of the quadrangle, and is formed linearly across the other pair of opposing sides. having at least two break lines;
The lid according to claim 14 or 15. A container body having an opening at the top, and a lid body according to any one of claims 1 to 21 covering the opening of the container body,
A container characterized by: The container body has a peripheral wall around the top opening,
The heat-shrinkable film covers the opening of the container body and is heat-shrunk to adhere to the outer peripheral surface of the peripheral wall of the container body.
23. A container according to claim 22.

Images