JPWO2005009868A1 - Lid for container sealing with excellent openability - Google Patents

Lid for container sealing with excellent openability Download PDF

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Publication number
JPWO2005009868A1
JPWO2005009868A1 JP2005512032A JP2005512032A JPWO2005009868A1 JP WO2005009868 A1 JPWO2005009868 A1 JP WO2005009868A1 JP 2005512032 A JP2005512032 A JP 2005512032A JP 2005512032 A JP2005512032 A JP 2005512032A JP WO2005009868 A1 JPWO2005009868 A1 JP WO2005009868A1
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Japan
Prior art keywords
lid
container
layer
cut
sealing
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
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JP2005512032A
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Japanese (ja)
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JP4353944B2 (en
Inventor
加川 清二
清二 加川
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加川 敦子
加川 敦子
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Priority to JP2003280364 priority
Application filed by 加川 敦子, 加川 敦子 filed Critical 加川 敦子
Priority to PCT/JP2004/010494 priority patent/WO2005009868A1/en
Publication of JPWO2005009868A1 publication Critical patent/JPWO2005009868A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10Container closures formed after filling
    • B65D77/20Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2028Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
    • B65D77/2044Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure
    • B65D77/2048Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure whereby part of the container or cover has been weakened, e.g. perforated or precut
    • B65D77/2056Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure whereby part of the container or cover has been weakened, e.g. perforated or precut the cover being weakened
    • B65D77/206Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure whereby part of the container or cover has been weakened, e.g. perforated or precut the cover being weakened so as to uncover one or more preformed openings made through some layers of the cover
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/06Interconnection of layers permitting easy separation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2577/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10Container closures formed after filling
    • B65D2577/20Container closures formed after filling by applying separate lids or covers
    • B65D2577/2041Pull tabs
    • B65D2577/205Pull tabs integral with the closure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2577/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10Container closures formed after filling
    • B65D2577/20Container closures formed after filling by applying separate lids or covers
    • B65D2577/2075Lines of weakness or apertures
    • B65D2577/2091Lines of weakness or apertures in cover

Abstract

A container sealing lid 2 that has a paper sheet 204, a curling plastic layer 201, and a partially easily peelable layer 23, and is sealed in a container with the paper sheet 204 below the curling plastic layer 201. In addition, it has an opening tab portion 21 provided on an outer peripheral edge and tear starting points 22a and 22b provided on both sides of the opening tab portion 21, and the partial easily peelable layer 23 is the tear starting point. A lid for container sealing provided outside the extension lines 220a and 220b in the tearing direction.

Description

  The present invention relates to a lid body which is excellent in open-holding property and is suitable for use in containers such as instant food.

  It is preferable that the lid of a container that stores instant food, such as cup ramen or instant yakisoba, is easy to pour when opening and can be easily sealed while being held for about 3 minutes. In order for the molten metal to be easily poured at the time of opening, the opened lid body must be strongly curled to maintain the opened state. Further, in order to facilitate resealing, it is necessary that the opening portion (flap portion) of the lid body easily engages with the remaining portion of the lid body or the container body to keep the flap portion in a sealed state. Is.

  Regarding the unsealing and holding property, Japanese Patent Application Laid-Open No. 2002-302154 (Patent Document 1) discloses a lid body 200 that is sealed to an upper end flange portion 1a of a container body 1 that stores contents, as shown in FIGS. 31 and 32. Thus, a lid having an opening tab portion 21 and tear starting points 22a and 22b provided on both sides of the opening tab portion 21 is disclosed. Since the lid body 200 is made of a laminated sheet having at least a dead hold property imparting paper sheet and a sealant film, when the opening tab portion 21 is lifted, the lid body 200 is extended from the tear start points 22a and 22b as shown in FIG. The strip-shaped flap portion 3 is formed by tearing along 220a and 220b. The remaining side edges 2a, 2b of the lid 2 and the side edges 3a, 3b of the strip-shaped flap portion 3 are notched because the tear surface of the paper sheet is exposed. Therefore, if the flap portion 3 is re-sealed after pouring the molten metal in a standing state, the serrated side edge portions 2a and 2b of the lid body 200 and the serrated side edge portions 3a and 3b of the strip-shaped flap portion 3 are Are engaged and the flap portion 3 is firmly resealed. However, since the lid body 200 has only the paper sheet as the dead-holding property imparting layer, it has been found that the rising of the flap portion 3 may not be sufficient.

  Japanese Patent Laid-Open No. 2004-83099 (Patent Document 2) discloses a lid composed mainly of a polybutylene terephthalate (PBT) film, a paper sheet, and a laminated sheet having a sealant film in order from the upper surface in order to ensure a sufficient rise of the flap portion 3. A body 300 is disclosed. Since the lid body 300 has the PBT film having an excellent dead hold property, the flap portion 3 is more excellent in curling property than the lid body described in Patent Document 2. However, since the flap portion 3 of the lid 300 has a portion on the lower surface side of the paper sheet over the entire surface, for example, when the lid body 300 has a resin film or the like having a high rigidity on the lower surface side of the paper sheet, the flap portion 3 does not rise. It turns out that there are things that aren't enough.

JP-A-2002-302154 JP-A-2004-83099

  Therefore, an object of the present invention is to provide a lid suitable for a container of instant food or the like, which has a dead hold property sufficient to hold the opened state.

As a result of earnest research in view of the above object, the present inventor has found that the flap portion obtained by opening the lid has a plastic layer having a large curl property on the entire surface and does not have the entire layer part on the entire surface. The present invention has been found out that the provision of the easily peelable layer makes it possible to achieve excellent open-holding property due to a large curl property.
That is, the first container-sealing lid of the present invention has a paper sheet, a curling plastic layer, and a partially easily peelable layer, and the paper sheet is placed below the curling plastic layer to form a container. Which has an opening tab portion provided on the outer peripheral edge and a tear starting point provided on both sides of the opening tab portion, and the partial easy peeling layer is the tear starting point. It is characterized in that it is provided outside the extension line in the tearing direction.

  The partially easily peelable layer is preferably formed from the tear starting point to a position beyond the center of the lid. It is preferable that the lid is provided with a peeling stop mark, and the partial easy peeling layer is formed from the tear start point to the position of the peeling stop mark.

  It is preferable that a half cut for opening is provided on the lower side of the lid along each tearing direction extension line of the tearing start point. It is preferable that the opening end of the half-cut for opening is slightly separated from the tearing start point. The lid body is composed of a laminated sheet having at least a curling plastic film, a paper sheet and a heat-sealing film in order from the top surface, and the half-cut for opening reaches at least the paper sheet in the laminated sheet. preferable. Preferably, the unsealing half cuts reach a depth of at least about 30% of the thickness of the paper sheet.

  A second container-sealing lid of the present invention has a paper sheet, a curling plastic layer, and a partially easily peelable layer, and seals the container with the paper sheet below the curling plastic layer. A container sealing lid, wherein an opening tab portion provided on an outer peripheral edge, a tab portion peeling half cut provided on a lower surface side of the opening tab portion, and the tab portion peeling half cut With a pouring hole forming annular half-cut carved on the lower side of the lid body at the center side, the partially easily peelable layer is provided so as to surround the pouring hole forming annular half-cut. It is characterized by being

  It is preferable that the partially easy peeling layer is formed from the half cut for peeling the tab portion to a position beyond the center of the lid. It is preferable that a peeling stop mark is provided on the lid body, and the partial easy peeling layer is formed from the half cut for peeling the tab portion to the position of the peeling stop mark.

  The third container-sealing lid of the present invention, which is affixed to the container for instant food after pouring and boiling, has the following features in addition to the features of the first or second lid. That is, the lid for sealing the container has a tab portion for forming a hot water spout, and the tab portion for forming a hot water spout has a pair of cuts, and the open end is directed inward between the pair of cuts. A plurality of substantially U-shaped half cuts engraved on the lower side, each U-shaped half cut consisting of a pair of linear parts and a connecting part of both linear parts, The tips of the U-shaped half cuts are all located in the seal portion of the lid body, and the portion surrounded by the U-shaped half cuts and the tips of the pair of straight portions form the hot water outlet forming tab portion. A partially easily peelable layer for forming a hot water spout is provided between each straight line extending in the opening direction.

  The direction of easy tearing of the lid substantially coincides with the direction of the cut, and when the lid is peeled off from the container main body with the tap forming tab portion, the cut and the U-shape are formed. The lid body is torn from the tip of the half-shaped cut, and the portion on the lower surface side of the partially easy-peeling layer for forming the hot water removal gate remains in close contact with the upper end flange portion of the container body to form a plurality of hot water removal openings. It is preferable that

  It is preferable that the U-shaped half cut has a depth from the lower surface of the lid to the partially easily peelable layer. It is preferable that the partly easily peeling layer for forming a hot water spout is provided from the U-shaped half cut to the position of the peeling stop mark for the tab part for forming a hot water spout.

  It is preferable that the pair of straight portions of the U-shaped half-cut are inclined so that the distance between them becomes narrower toward the front. It is preferable that a pair of line portions are provided at the ends of the pair of cuts so as to be gradually widened toward the front.

  It is preferable that the tip of the cut and the tip of the pair of linear portions of the U-shaped half cut are located on the outer peripheral side with respect to the center line of the seal portion of the lid. The positions of the tip of the cut and the tips of the pair of linear portions of the U-shaped half cut in the seal portion are more preferably within the range of 30 to 50% of the width of the seal portion from the outer circumference.

  It is preferable that a half cut for forming a hot water spout is provided on a straight line extending from each tip of the cut in the opening direction. It is preferable that a half cut for forming a hot water spout is provided below the lid along a straight line extending from each tip of the U-shaped half cut in the opening direction.

  The fourth container-sealing lid of the present invention, which is affixed to the container for instant food that is poured and then drained, has the following features in addition to the features of the first or second lid. That is, in this container sealing lid, (a) a plurality of rectangular half-cuts for forming a hot water port are engraved on the lower side of the lid at a position substantially facing the opening tab portion, and (b) ) The partially easily peelable layer extends in the unsealing direction from the tear start point of the unsealing tab portion and is connected in a region inside the unsealing tab portion or in a region beyond the center of the lid U A region having a U-shape and surrounding the half-cut for forming the rectangular hot water outlet, and (c) a region not having the U-shaped partial easy peeling layer and a region having the U-shaped partial easy peeling layer. A half-cut for layer separation is engraved on the lower side of the lid along a boundary that is substantially orthogonal to the opening direction among the boundaries between and.

  The U-shaped partial easy peeling layer is provided such that a boundary, which is substantially perpendicular to the opening direction, of a boundary with a region not having the U-shaped partial peeling layer has a curved shape toward the central portion of the lid body. Is preferred.

  It is preferable that each of the first to fourth container sealing lids has a polybutylene terephthalate film as the curling plastic layer.

  Each of the first to fourth container sealing lids has a curling plastic layer, a paper sheet, an adhesive layer, a rigid plastic film and a sealant layer from the upper surface side, and the partial easy peeling layer is formed on the adhesive layer. It is preferably provided. The rigid film is preferably made of a uniaxially oriented or biaxially oriented polyethylene terephthalate film having a different degree of orientation. The partially easy peeling layer is preferably on the upper surface or the lower surface of the adhesive layer, or on the same plane as the adhesive layer. Adhesive plastic (for example, polyethylene) films are preferably provided on both sides of the partially easy peeling layer so that the paper sheet is not exposed on the peeling surface.

  The lid for container sealing of the present invention has the flap portion obtained by opening has a plastic layer having a large curl property on the entire surface, and does not have the entire layer part on the entire surface, and therefore has an excellent opening retention due to the large curl property. Sex can be used. Therefore, when opening the flap, the flap portion can be held in a largely raised state so that the molten metal can be easily poured. Further, when the partially easy peeling layer is provided on the upper surface side of the paper sheet, the notched fracture surface of the paper sheet is exposed at the flap portion obtained by opening, and excellent resealing due to the engagement of the notched fracture surface of the paper sheet. Sex can also be used. Therefore, at the time of heat retention, the flap portion can be firmly engaged with the lid body only by returning the flap portion to the original position, and the resealed state can be reliably retained. In this way, the lid having the partial easy peeling layer on the upper surface side of the paper sheet is excellent in both opening holding property and resealing property.

  The lid of the present invention having such characteristics is suitable as a lid for instant food such as cup noodles that is poured by boiling water for eating. The food container provided with the lid having the excellent curling property of the present invention is useful not only as an instant food but also as a small-sized container for containing a flavor additive.

FIG. 3 is a perspective view showing a container sealing lid attached to a cup noodle container according to an embodiment of the present invention. It is a top view which shows the cover of FIG. It is a bottom view which shows the cover of FIG. It is an AA expanded sectional view of FIG. It is an expanded sectional view which shows the part X of FIG. It is a BB enlarged sectional view of FIG. It is an expanded sectional view showing another layer composition of a lid. It is a perspective view which shows the state which opened the cover body of FIG. 1 attached to the cup ramen container. FIG. 2 is a perspective view showing a state where the lid body of FIG. 1 attached to the cup ramen container is opened and then resealed. FIG. 8 is a plan view showing a lid according to another embodiment of the present invention. It is a top view which shows the state which expanded the flap part formed by opening the lid of FIG. 10 180 degrees. FIG. 11 is an enlarged cross-sectional view taken along line CC of FIG. 10. It is a top view which shows the cover body by another Example of this invention. It is a bottom view which shows the cover body of FIG. FIG. 14 is a partial enlarged view showing the vicinity of a hot water spout forming tab portion of the lid body of FIG. 13. FIG. 14 is another partially enlarged view showing the vicinity of the hot water spout forming tab portion of the lid body of FIG. 13. FIG. 14 is an enlarged sectional view taken along line DD of FIG. 13. It is an EE expanded sectional view of FIG. FIG. 14 is a partially enlarged view showing a state where the hot water spout forming tab portion of FIG. 13 is opened. It is a top view which shows the cover body by another Example of this invention. It is a bottom view which shows the cover body of FIG. It is an FF enlarged sectional view of FIG. It is a GG enlarged sectional view of FIG. It is a perspective view which shows the state which removed the flap part formed by opening the lid body of FIG. 20 attached to the container for instant yakisoba. FIG. 7 is a perspective view showing a lid body according to still another embodiment of the present invention attached to a cup ramen container. FIG. 7 is a perspective view showing a lid body according to still another embodiment of the present invention attached to a cup ramen container. FIG. 8 is a perspective view showing a lid body according to still another embodiment of the present invention attached to a container for instant yakisoba. It is an expanded sectional view showing another layer composition of a lid of the present invention. It is an expanded sectional view showing another layer composition of a lid of the present invention. It is a top view showing a mode that a plurality of lids are punched out from a lamination sheet. It is a perspective view which shows the example of the conventional lid attached to the cup ramen container. FIG. 32 is a perspective view showing a state where the lid body of FIG. 31 attached to the cup ramen container is opened.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1... Container main body 1a... Upper end flange part 2,200,300... Lid 2a, 2b, 2c... Ragged fracture surface of paper sheet 20... Laminated sheet 201... Curling property Plastic film 202, 203, 203a, 203b, 205, 206, 206a, 206b, 209, 210... Adhesive layer 204... Paper sheet 207... Rigid plastic film 208... Light-shielding ink layer 211...・Sealant film 212・・・Aluminum foil 21・・・Opening tabs 22a, 22b・・・Tearing starting point (break)
220a, 220b... Extension line of tearing start point 221... Slit-like through hole 222... Another opening tab portion 23, 23a, 23b, 23c... Partially peelable layer 230... Boundary 24a , 24b... Half-cut for opening 240a, 240b... Start end of half-cut for opening 24c... Annular half-cut for forming pouring hole 24d... Half-cut for peeling tab part 24e... For layer separation Half cut 25... Seal part 25a... Center line of seal part 26, 260... Mark 27... Tab part 28a, 28b... Break line 280a, 280b... Straight line of cut line Part 281a, 281b... Tip inclined part of cut 282... Extension line 283... Half cut for forming hot water cut 29... U-shaped half cut 290... Connection part 291... Inclined part 292・・・Extended line 293・・・Half cut for forming hot water cut opening 293'・・・Starting end of half cut for forming hot water cut opening 294・・・Rectangular half cut for forming hot water cut opening 3・・・Flap portion 31・・All layers of the flap portion 32, 32a, 32b... curl portions 3a, 3b, 3c... jagged fracture surface 10 of the paper sheet layer... (Hatched part)
11... Strip portion 12... Hot water outlet 125... Peelable resin

  The structure of the lid of the present invention will be described with reference to the accompanying drawings, and unless otherwise specified, the same parts as those shown in FIGS. 31 and 32 are designated by the same reference numerals. Therefore, refer to the description of the lid body shown in FIGS. 31 and 32.

[1] Structure of lid (1) First lid FIGS. 1 to 3 show a first lid of the present invention. The lid 2 attached to the cup ramen container 1 has an opening tab portion 21 and tear starting points 22a and 22b provided on both sides of the opening tab portion 21. Partially peelable layers 23a and 23b are provided outside the tearing direction extension lines 220a and 220b of the pair of tearing start points 22a and 22b. The tear starting points 22a and 22b may be cuts or notches. In the present embodiment, a description will be given below by taking breaks as the tear starting points 22a and 22b.

The distance d 1 between the pair of cuts 22a and 22b can be appropriately set according to the type of contents. For example, in the case of cup noodles in which boiling water is poured, when the outer diameter of the upper end flange portion 1a of the container body 1 is about 10 cm, the distance d 1 between the cuts 22a and 22b is preferably about 4 to 8 cm. It should be noted that in order to open the entire surface of the lid body 2 at the time of eating, another opening tab portion may be integrally provided on the lid body 2 at a position facing the outer peripheral edge.

  As shown in FIG. 2, the tips of the pair of cuts 22a and 22b are located at the seal portion 25 of the lid body 2 (the portion that is heat-sealed to the upper end flange portion 1a of the container body 1) for sealing the contents. To do.

  When the lid 2 is manufactured by punching out the continuous laminated sheet 20 at a high speed, the tolerance is about 1 mm. Therefore, the tips of the pair of cuts 22a and 22b are located outside the center line 25a of the seal portion 25 of the lid 2. It is preferable that it is within the range of 30 to 50% of the width of the seal portion 25 from the outer circumference, and it is particularly preferable that it is within the range of 30 to 40% of the width of the seal portion 25 from the outer circumference.

  It is preferable that the partially peelable layers 23a and 23b are formed to a position beyond the center O of the lid 2. For example, as shown in FIG. 2, the partially easily peelable layers 23 a and 23 b are formed at least up to the position of the peeling stop mark 26.

As shown in FIG. 3, it is preferable that the opening half cuts 24a and 24b are engraved on the lower side of the lid 2 along the extension lines 220a and 220b. By providing the half-cuts 24a and 24b for opening, the lid 2 can be easily torn. However, the pair of cuts 22a and 22b and the opening ends 240a and 240b of the opening half cuts 24a and 24b must be slightly separated. This is because the lid body 2 must be heat-sealed to the container body 1 without any gap before opening. The distance d2 between the pair of cuts 22a, 22b and the starting ends 240a, 240b of the opening half cuts 24a, 24b is preferably 1 to 10 mm, more preferably 2 to 5 mm. It is preferable that the half-cuts 24a and 24b for opening are formed to a position beyond the center O of the lid 2. For example, as shown in FIG. 3, the opening half cuts 24a and 24b are peeled off and formed to the position of the stop mark 26.

The layer structure of the lid body 2 will be described. In the example shown in FIG. 4, the lid body 2 includes a curling plastic (PBT) film 201, an extrusion-laminated polyethylene layer 203a, an adhesive layer 202, an extrusion-laminated polyethylene layer 203b, a paper sheet 204, an adhesive layer 205, and an extruded layer. It comprises a laminated polyethylene layer 206, a rigid plastic (PET) film 207, a light blocking ink layer 208, an adhesive layer 209, an extrusion laminated polyethylene layer 210, and a sealant layer 211. The partially easily peelable layers 23 a and 23 b are formed as a part of the adhesive layer 202. The half-cuts 24a and 24b for opening are formed by penetrating the sealant layer 211, the polyethylene layer 210, the adhesive layer 209, the light-shielding ink layer 208, the rigid plastic film 207, the polyethylene layer 206, and the adhesive layer 205 from the lower surface of the lid body 2. A part of the sheet 204 has been reached. Opening for the half-cut 24a, 24b are preferably reaches the depth d 4 corresponding to at least about 30% of the thickness d 3 of the paper sheet 204. Instead of the opening half cuts 24a and 24b, perforations along the extension lines 220a and 220b may be provided only on the paper sheet 22.

  In the example shown in FIG. 5, an adhesive layer 202 is formed between a pair of polyethylene layers 203a and 203b between a curling plastic (PBT) film 201 and a paper sheet 204, and a part of the adhesive layer 202 is partially formed. It is the easily peelable layer 23b. As shown in FIG. 6, the partially easily peelable layer 23 b has a structure in which the dot-like peelable resin 125 is uniformly distributed in the adhesive layer 202. However, the partial easy peeling layer is not limited to this, and may be a peelable resin layer coated in a thin film on the upper surface side or the lower surface side of the adhesive layer 202.

  FIG. 7 shows another configuration of the lid body 2 of the present invention. In this example, the partially peelable layers 23a, 23b are formed as part of an adhesive layer 205 provided between a pair of polyethylene layers 206a, 206b between a paper sheet 204 and a rigid plastic (PET) film 207. Has been done. The half-cuts 24a and 24b for opening penetrate the sealant layer 211, the polyethylene layer 210, the adhesive layer 209, the light-shielding ink layer 208, the rigid plastic film 207, and the polyethylene layer 206b from the lower surface of the lid 2 to reach the adhesive layer 205. is doing.

  When the opening tab portion 21 of the lid body 2 made of the laminated sheet 20 shown in FIG. 4 is pulled up, the lid body 2 is peeled from the upper end flange portion 1a of the container 1 and extended to the extension lines 220a and 220b as shown in FIG. The curling plastic (PBT) film 201 is separated from the lower surface side of the paper sheet 204 by the partially peelable layers 23a and 23b. Since the paper sheet 204 is torn at the extension lines 220a and 220b, crevice fracture surfaces 2a and 2b are formed on the remaining lid 2 side, and crevice fracture surfaces 3a and 3b are also formed on the flap portion 3. Therefore, as shown in FIG. 9, when the flap portion 3 is resealed, the notched fractured surfaces 2a and 2b of the lid body 2 and the notched fractured surfaces 3a and 3b of the flap portion 3 are firmly engaged, and the flap portion 3 is Ensure resealing of.

  When the rigid plastic (PET) film 207 of the laminated sheet 20 forming the lid body 2 has easy tearability, the half cuts for opening 24a and 24b can be omitted. This is because when the rigid plastic (PET) film 207 of the laminated sheet 20 forming the lid body 2 has easy tearability, the easy tearing direction is made to substantially coincide with the tearing direction of the lid body 2 to open the lid. This is because when the lid body 2 is peeled off while holding the use tab portion 21, the lid body 2 is easily torn linearly from the pair of cuts 22a and 22b along the easy tearing direction.

  Further, in the regions of the partially easily peelable layers 23a and 23b, only the curl portions 32a and 32b made of the curl plastic film 201 are substantially attached to both sides of the entire layer portion 31 of the flap portion 3, so that the flap portion 3 The curl is very large. Therefore, with the lid body 2 left open, the cup ramen container 1 has a sufficient frontage for pouring molten metal. In this way, the lid body 2 having the partial easily peelable layers 23a and 23b on the upper surface side of the paper sheet 204 is excellent in both the opening holding property and the resealing property.

(2) Second lid body FIGS. 10 and 11 show a second lid body of the present invention. 10 and 11, the same members or portions as those in FIGS. 1 to 3 are designated by the same reference numerals. The lid body 2 attached to the cup ramen container 1 has a tab portion 21 for opening, a half cut 24d for peeling the tab portion provided on the lower surface side of the tab portion 21, and a center side of the half cut 24d for peeling the tab portion. It has an annular half cut 24c for forming a pouring port formed on the lower side of the lid body 2, and a partially easily peelable layer 23 provided so as to surround the annular half cut 24c for forming a pouring port.

  The circular half-cut 24c for forming the pouring port may have a size sufficient for pouring the molten metal. The pouring spout forming annular half cut 24c may be annular so that the pouring spout is formed, and may have a rectangular shape, a trapezoidal shape or the like other than the elliptical shape shown in FIG.

  The partial easy peeling layer 23 is preferably formed from the tab portion peeling half cut 24d provided on the opening tab 21 to a position beyond the center O of the lid 2. For example, as shown in FIG. 10, the partial easy peeling layer 23 is formed at least up to the position of the peeling stop mark 26.

  In the example shown in FIG. 12, the lid body 2 has the same layer structure as that shown in FIG. 4, and the partially easy peeling layer 23 is a pair of polyethylene layers 203a between the curling plastic film 201 and the paper sheet 204. , 203b are provided as a part of the adhesive layer 202. The annular half cut 24c for forming the pouring opening and the half cut 24d for peeling off the tab portion are formed from the lower surface of the lid body 2 from the sealant layer 211, the polyethylene layer 210, the adhesive layer 209, the light shielding ink layer 208, the rigid plastic film 207, and the polyethylene layer 206. , The adhesive layer 205 and the paper sheet 204 are penetrated to reach the adhesive layer 202.

  Therefore, when the unsealing tab portion 21 is pulled up, as shown in FIG. 11, the curl plastic (PBT) film 201 is separated from the portion on the lower surface side of the paper sheet 204 by the partial easy peeling layer 23. Since the notched fractured surface 2c is formed on the side of the remaining lid body 2 and the notched fractured surface 3c is also formed on the flap portion 3, re-sealing of the flap portion 3 can be surely performed like the first lid body.

  Further, similarly to the first lid, in the region of the partially easily peelable layer 23, only the curl portion 32 made of the curl plastic film 201 is substantially attached around the entire layer portion 31 of the flap portion 3. The curl of the flap portion 3 is very large.

(3) Third lid body FIGS. 13 to 16 show a third lid body of the present invention. 13 to 16, the same members or parts as those in FIGS. 1 to 3 are designated by the same reference numerals. This lid 2 has (a) a hot water spout forming tab portion 27 at a position substantially opposite to the opening tab portion 21, and (b) a pair of slits 28a, 28b, and both slits 28a, in the tab portion 27. 28b and a plurality of substantially U-shaped half cuts 29 engraved on the lower side of the lid body 2 at substantially equal intervals, and (c) a portion surrounded by the U-shaped half cuts 29. And between the straight lines 292 and 292 extending from the tips of the pair of inclined portions 291 and 291 of the U-shaped half-cut 29 in the opening direction of the hot-water tap forming tab portion 27, the partially easy-peeling layer 23c for hot-water tap forming. 1 is substantially the same as the first lid except that it is attached to the instant yakisoba container 1.

  Although each of the cuts 28a and 28b may be linear, in order to improve the tearability, the linear parts 280a and 280b extending from the outer peripheral edge of the lid 2 and the linear parts 280a and 280b are inclined in a direction of expanding. It is preferably composed of the respective tip portions 281a and 281b.

  Each U-shaped half cut 29 is composed of a pair of inclined portions 291, 291 that are inclined so that the interval becomes narrower toward the front, and a connecting portion 290 thereof, and substantially has the open end facing inward. It is preferably U-shaped, which improves tearability. However, the pair of inclined portions 291 and 291 may be parallel straight lines. 1-6 pieces are preferable and, as for the number of U-shaped half cuts 29, 2-5 pieces are more preferable.

  As shown in FIG. 15, in order to secure a sufficient heat-sealing property, the tip inclined portions 281a and 281b and the inclined portions 291 and 291 must all be located inside the seal portion 25 of the lid 2.

Since the tolerance when punching the continuous laminated sheet 20 to manufacture the lid body 2 at a high speed is about 1 mm, the tips of the tip inclined portions 281a and 281b of the pair of cuts 28a and 28b, and the U-shaped half cuts. the tip of the inclined portion 291,291 of 29 is preferably a radially outward of the center line 25a of the seal portion 25 of the lid 2, is within 30-50% of the range of the width d 10 of the sealing portion 25 from the outer periphery Is more preferable, and it is particularly preferable that it is within the range of 30 to 40% of the width of the seal portion 25 from the outer periphery. Further, from the viewpoint of not impairing the adhesiveness of the strip portion 11 when the lid body 2 is peeled off by holding the hot water spout forming tab portion 27, the connecting portion 290 of the U-shaped half cut 29 is a seal portion. It is preferably located within 25.

In order to shorten the hot water removal time, it is desirable to make the width d 11 of the hot water removal port 12 as wide as possible. However, if this is done, the area of the lid portion peeled off from the seal portion 25 becomes large and the opening resistance becomes large. The opening resistance is maximum at the start of peeling, and if the peeling area from the seal portion 25 is large, a large initial opening resistance is felt. Therefore, as shown in FIG. 15, the tip end portions 281a and 281b that are inclined in the expansion direction and the inclined portions 291 and 291 that are closer to each other in the distance gradually increase the peeling area from the seal portion 25, which is large. It is possible to smoothly open the hot water spout forming tab portion 27 without feeling initial resistance.

  The length of each tip inclined portion 281a, 281b and each inclined portion 291 is preferably 0.5 to 3 mm. As shown in FIG. 16, the angle θ between the tip inclined portions 281a and 281b and the linear portions 280a and 280b and the angle θ′ between the inclined portion 291 and the straight line 292 are both preferably 120° to 170°, It may be the same. If these angles are out of this range, even if the lid body 2 has the easy tearing property, the tip end slanting parts 281a, 281b and the slanting parts 291 are linearly torn along the easy tearing direction. There is a possibility that there is no.

The distance d 12 between the tips of the inclined portions 291 and 291 is preferably narrower than the width d 6 of the U-shaped half cut 29 by 0.5 to 3 mm. Specifically, when the instant food in the container is yakisoba, the distance d 12 between the tips of the inclined portions 291, 291 is preferably 6 to 8 mm, and the width d 11 of the hot water outlet 12 is 4 to 7 mm. Is preferred.

In the examples shown in FIGS. 13 to 16, the distance d 5 between the pair of cuts 22a and 22b provided on both sides of the opening tab portion 21 can be appropriately set according to the type of contents. For example, in the case of cup noodles in which boiling water is poured, if the outer diameter of the upper end flange portion 1a of the container body 1 is about 18 cm, the distance d 5 between the cuts 22a and 22b is preferably about 9 to 15 cm. The width d 6 of the U-shaped half cut 29, the distance d 7 between the cuts 28a, 28b and the U-shaped half cut 29, and the distance d 8 between the U-shaped half cuts 29 are 3 to 10 mm, respectively. Is preferred.

As shown in FIG. 13, it is preferable to engrave a half cut 283 for forming a hot water outlet on straight lines 282 and 282 extending from the respective tips of the cuts 28a and 28b. Further, as shown in FIG. 14, it is preferable to engrave a half cut 293 for forming a hot water outlet on a straight line 292 extending from the tip of each inclined portion 291 of the U-shaped half cut 29. The tearability of the lid body 2 is improved by engraving the half cuts 283 and 293 for forming the hot water spout. However, from the viewpoint of the sealing property of the lid body 2 as described above, as shown in FIG. 15, the tip end of each inclined portion 291 of the U-shaped half cut 29 and the start end 293′ of the half cut 293 for forming a hot water spout are formed. , The seal portion 25 must be slightly separated. And the tips of the inclined portions 291,291, a distance d 9 between the starting end 293 of the water cuts forming the half-cut 293 'is preferably a 1 to 10 mm, and more preferably 2 to 5 mm. It is preferable that the ends of the half cuts 283 and 293 for forming the hot water spout be several cm from the upper end flange portion.

  When the lid body 2 is formed of the easily tearable laminated sheet 20, it is preferable that the easy tearing direction substantially coincides with the tearing direction of the lid body 2. As a result, when the lid body 2 is peeled off by holding the hot water spout forming tab portion 27, the lid body 2 extends from the tips of the pair of cuts 28a, 28b and the tips of the U-shaped half cuts 29 along the easy tear direction. Easily torn in a straight line. When the lid body 2 is easily tearable, the half cuts 283 and 293 for forming the hot water spout can be omitted.

  In the example shown in FIG. 17, the lid body 2 has the same layer configuration as the laminated sheet 20 shown in FIG. 4, and the partially easily peelable layer 23c is a pair of polyethylene layers between the paper sheet 204 and the rigid plastic film 207. It is provided as a part of the adhesive layer 205 between 206a and 206b. The U-shaped half cut 29 includes a sealant layer 211, an extrusion-laminated polyethylene layer 210, an adhesive layer 209, a light-shielding ink layer 208, a rigid plastic (PET) film 207, and an extrusion-laminated polyethylene layer from the lower surface of the lid 2. It penetrates 206 b and reaches the adhesive layer 205.

  As shown in FIG. 18, it is preferable that the half-cut 283 for forming a hot water outlet reaches a part of the paper sheet 204 from the upper surface of the lid body 2, and corresponds to at least about 30% of the thickness of the paper sheet 204. It is more preferable that the depth is reached. Like the U-shaped half cut 29, it is preferable that the half cut 293 for forming a hot water spout reaches the adhesive layer 205 from the lower surface of the lid body 2.

  When the lid body 2 is peeled from the container main body 1 by holding the hot water spout forming tab portion 27, only a portion 10 shown by hatching is obtained, and a plurality of hot water spouts 12 are obtained as shown in FIG. In the strip portion 11 composed of the enclosed portion and its extended portion, the portion on the lower surface side of the rigid plastic (PET) film 207 remains in close contact with the upper end flange portion 1a of the container body 1 due to the partial easily peeling layer 23c. .

  As shown in FIG. 15, it is preferable that the lid 2 is provided with a mark 260 indicating the peeling limit at a position where the instant food (fried noodles, etc.) in the container can be drained efficiently without leaking. The position of the mark 260 is preferably set so that the length of the hot water spout 12 is about 1 to 5 cm. The length of the partially easily peelable layer 23c may be substantially the same as the length of the hot water spout 12 to be formed.

  The third lid may have the features of the second lid with respect to the opening holding function of the lid 2.

(4) Fourth lid body FIGS. 20 and 21 show a fourth lid body of the present invention. 20 and 21, the same members or portions as those in FIGS. 1 to 3 are designated by the same reference numerals. The lid 2 has (a) a plurality of rectangular half-cuts 294 for forming hot water spouts formed in the lower side of the lid 2 at a position substantially facing the opening tab portion 21, and (b) partially. The easily peelable layer 23 extends in the unsealing direction from the tear start point of the tab portion 21 with the extension lines 220a and 220b as boundaries, and is connected in a region beyond the center O of the lid body 2 to form a U-shape and The opening direction is surrounded by the rectangular half-cut 294 for forming a cut end, and (c) the boundary between the region not having the U-shaped partial easy peeling layer 23 and the region having the U-shaped partial easy peeling layer 23. Substantially the same as the first lid body, except that the layer-separating half cut 24e is engraved on the lower side of the lid body 2 along a boundary 230 substantially orthogonal to the first lid body. As shown in FIG. 20, it is preferable that the partial easy peeling layer 23 is provided so that a boundary 230 with a region not having the partial peeling layer 23 is curved toward the central portion of the lid 2.

  The partial easy peeling layer 23 is not necessarily intended to be connected in a region beyond the center O of the lid body 2, but is a region inside the opening tab portion 21 (a region from the tab portion 21 to the center O). May be connected with.

  In the example shown in FIG. 22, the lid 2 has the same layer structure as that shown in FIG. 4, and the partially easily peelable layer 23 is a pair of polyethylene layers 203 a between the curling plastic film 201 and the paper sheet 204. , 203b are provided as a part of the adhesive layer 202. The layer separation half cut 24e penetrates the sealant layer 211, the polyethylene layer 210, the adhesive layer 209, the light-shielding ink layer 208, the rigid plastic film 207, the polyethylene layer 206, the adhesive layer 205, and the paper sheet 204 from the lower surface of the lid 2. And reaches the adhesive layer 202. Further, as shown in FIGS. 22 and 23, the rectangular half-cut 294 for forming the hot water spout also reaches the adhesive layer 202 from the lower surface of the lid 2.

  Therefore, when eating fried noodles, hot water is poured while the lid 2 is kept open, and the lid 2 is held closed for a predetermined time, and then the lid 2 is further opened by holding the opening tab 21. When pulled in the direction, as shown in FIG. 24, the partially peelable layer 23 separates the curling plastic film 201 from the portion on the lower surface side of the paper sheet 204, so that the hot water spout 12 can be formed.

  Note that the fourth lid may have the features of the second lid with respect to the unsealing and holding function of the lid 2.

(5) Other Examples The shapes of the first to fourth lids are not limited to those shown in the drawings, and various modifications can be made without changing the gist of the present invention.

  FIG. 25 shows the lid body 2 in which the slit-shaped through hole 221 is provided at a position corresponding to the outer edge of the upper end flange portion 1a of the opening tab portion 21. The lid 2 is the same as the first lid except the slit-shaped through hole 221. In the container provided with this lid body 2, when the opened lid body 2 is returned to the original closed position, the slit-shaped through hole 221 can be engaged with the upper end flange portion 1a, so that the resealing property is improved. A slit may be provided instead of the slit-shaped through hole 221.

  FIG. 26 shows an example in which a slit-shaped through hole 221 and another tab portion 222 are provided in the lid body 2. The lid body 2 is the same as the first lid body except for the slit-shaped through hole 221 and the tab portion 222. By engaging the tab portion 222 with the slit-shaped through hole 221, the opening of the lid body 2 can be maintained.

  The lid body 2 shown in FIG. 27 is to be attached to the square container 1 for instant yakisoba, and the opening tab portion 21 and the hot water spout forming tab portion 27 are provided at substantially diagonal corner portions. The structure itself of the lid body 2 is the same as that of the third lid body.

  Regarding the hot water drainage function of the third and fourth lids, as described in JP-A-2000-109141, a partial easy peeling layer is provided in a region having a drainage opening, and a partial easy peeling layer is provided under the lid 2. A plurality of circular half cuts for forming a hot water cut opening reaching the easily peelable layer may be engraved.

[2] Layer Structure of Lid Body The layer structure of the lid body 2 of the present invention is not limited, but preferable layer structure examples other than the examples shown in FIGS. 4 and 7 will be described. The laminated sheet 20 shown in FIG. 28 is the same as the laminated sheet 20 shown in FIG. 4 except that it does not have the rigid plastic film 207. The laminated sheet 20 shown in FIG. 29 is the same as the example shown in FIG. 4 except that an aluminum foil 212 is used as the light-shielding property-imparting layer instead of the light-shielding ink layer 208.

Hereinafter, each layer will be described in detail.
(1) Curl plastic film The lid 2 of the present invention has a curl plastic film 201 on the outside of the paper sheet 204. As the curling plastic film 201, a polyester film is preferable. Examples of the polyester film include films made of polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), and the like. PBT film and PET film are commercially available at low cost. Particularly, the PBT film is preferable because it is excellent in dead-hold property, aroma retaining property, gas barrier property and heat resistance.

  The PBT film is a saturated polyester film basically composed of 1,4-butanediol and terephthalic acid. However, a diol component other than 1,4-butanediol or a camponic acid component other than terephthalic acid may be contained as a copolymerization component as long as the physical properties such as heat shrinkability are not impaired. Examples of such a diol component include ethylene glycol, diethylene glycol, neopentyl glycol, 1,4-cyclohexanemethanol and the like. Examples of the dicarboxylic acid component include isophthalic acid, sebacic acid, adipic acid, azelaic acid, succinic acid and the like. As a specific example of the PBT resin constituting the PBT film, for example, a homo PBT resin commercially available from Toray Industries, Inc. under the trade name of “Trecon” can be mentioned.

  The PET film is a saturated polyester film basically composed of ethylene glycol and terephthalic acid. However, a diol component other than ethylene glycol or a camponic acid component other than terephthalic acid may be contained as a copolymerization component as long as the characteristics of the PET film are not impaired. Examples of such diol components include diethylene glycol, 1,4-butanediol, neopentyl glycol, 1,4-cyclohexanemethanol, and the like, and examples of dicarboxylic acid components include isophthalic acid, sebacic acid, adipine. Acid, azelaic acid, succinic acid and the like can be mentioned. PET films are usually commercially available as biaxially stretched films, such as "Lumilar" manufactured by Toray Industries, Inc., "Toyobo Ester Film" manufactured by Toyobo Co., Ltd., and "Emblet PC" manufactured by Unitika Co., Ltd. Has been done.

  The polyester film is not limited to the one made of a single resin component, and may be made of a plurality of resin components. Examples of the combination of resin components include, in addition to the combination of a plurality of polyester resins, one or two or more kinds of polyester resins to which other thermoplastic resins are added within a range that does not impair the characteristics thereof. Other thermoplastic resins include polyphenylene sulfide (PPS); polyamide (PA); polyimide (PI); polyamide imide (PAI); polyether sulfone (PES); polyether ether ketone (PEEK); polycarbonate; polyurethane; Fluorine resins; polyolefins such as polyethylene and polypropylene; polyvinyl chloride; thermoplastic elastomers and the like. For example, when a PBT film is used as the curling plastic film 201, if the PBT resin that is the film raw material contains polyethylene, the film-forming property during film production is improved, and a PBT film having excellent film thickness uniformity is obtained. can get. When other thermoplastic resin is contained, the proportion thereof is preferably 5 to 20% by mass, more preferably 5 to 15% by mass, and more preferably 5 to 10% by mass, based on 100% by mass of the entire polyester film. Is particularly preferable. Therefore, unless otherwise specified, the terms "PET film" and "PBT film" used in the present specification include not only PET or PBT alone, but also compositions containing PET or PBT and other thermoplastic resins. Should be understood.

  The curling plastic film 201 may be a plasticizer, a stabilizer such as an antioxidant, an ultraviolet absorber or the like, an antistatic agent, a surfactant, a coloring agent such as a dye or a pigment, or a flow agent depending on the use of the container for instant food. Additives such as lubricants and inorganic fillers for improving the properties may be appropriately contained.

  The thickness of the curling plastic film 201 is practically preferably about 5 to 50 μm. It is technically difficult to reduce the thickness of the curling plastic film 201 to less than about 5 μm. Further, if the thickness of the curling plastic film 201 exceeds about 50 μm, the cost becomes high. It is preferably 10 to 30 μm. The PBT film having a thickness of about 5 to 50 μm has sufficient dead-holding property, aroma retaining property and gas barrier property.

  The heat shrinkage rate of the PBT film is preferably 2% or less in both MD (machine direction) and TD (width direction). The heat shrinkage ratio is measured by heating the PBT film at 150° C. for 10 minutes. A PBT film having a heat shrinkage rate of 2% or less can be produced by an air cooling inflation molding method. Examples of the method for producing the PBT film by the air-cooled inflation molding method include the method described in WO 2004/026558.

  When a large number of substantially parallel linear scratches and/or a large number of fine holes are formed in the curl plastic film 201, the linear tearability of the lid body 2 is improved.

(2) Transparent resin coating layer When a transparent resin coating layer is provided on the upper surface of the PBT film 201, the PBT film 201 absorbs fine surface irregularities and acquires transparency and high image clarity. Therefore, the printed layer visible through the PBT film 201 becomes beautiful and clear. The transparent resin may be water-soluble or water-insoluble, but a water-soluble resin is preferable in that an organic solvent is not used. Examples of the water-soluble transparent resin include polyvinyl alcohol, cellulosic polymers, polyvinylpyrrolidone, polyethylene glycol, polyacrylamide and the like. Polyvinyl alcohol may be modified with anions, cations, acetals, etc., and may be ethylene-vinyl alcohol copolymer, partially saponified polyvinyl acetate, etc. The degree of polymerization of polyvinyl alcohol is preferably 1000 or less.

  Examples of the water-insoluble transparent resin include acrylic resin, polyurethane resin, epoxy resin, polystyrene resin, UV-curable unsaturated acrylic resin, UV-curable unsaturated ester resin, and polycarbonate resin.

  Although the thickness of the transparent resin coating layer is not limited, it is preferably 1 to 5 μm, more preferably 2 to 4 μm. If the thickness of the transparent resin coating layer is less than 1 μm, the improvement of the printing clarity is insufficient, and if it exceeds 5 μm, the cost becomes high.

(3) Paper Sheet The paper sheet 204 functions as a dead hold property imparting layer. The type of paper is not limited and includes synthetic paper. Basis weight of the paper sheet 204 is preferably from about 60~120g / m 2, and more preferably, about 75~110g / m 2. If the basis weight of the paper sheet 204 is less than about 60 g/m 2 , the stiffness of the paper sheet is too weak to provide sufficient dead hold. On the other hand, even if the basis weight of the paper sheet 204 exceeds about 120 g/m 2 , the cost becomes high and further improvement of the dead hold property is not recognized.

(4) Rigid plastic film The rigid plastic film 207 is preferably a PET film. In order to enhance the linear tearability of the lid body 2, it is preferable to use a uniaxially oriented PET film or a biaxially oriented PET film having a different degree of orientation as the PET film. Biaxially oriented PET films having different degrees of orientation are commercially available as "Emblet PC" (Unitika Ltd.). In addition, when a large number of substantially parallel linear scratches and/or a large number of fine holes are formed in the rigid plastic film 207, the linear tearability of the lid body 2 is improved. It is preferable that the direction of easy linear tearing of the lid body 2 is parallel to the opening half cuts 24a and 24b. The thickness may be appropriately set as needed.

(5) Light-shielding property-imparting layer In order to prevent alteration of the instant food due to sunlight or ultraviolet rays, the lid 2 has a light-shielding ink layer 208 or an aluminum foil 212. The light-blocking ink 208 is not particularly limited as long as it is an ink containing a black or dark pigment or dye such as carbon black. The light-shielding ink layer 208 has an advantage that it does not adversely affect the environment at the time of incineration processing, and also has an advantage that a metal-based foreign substance in a sealed container can be detected by a metal detector. Therefore, not only the safety of the instant food is further improved, but also the inspection cost can be remarkably reduced by using the metal detector. The aluminum foil 212 has excellent light-shielding property, gas barrier property, aroma retaining property and the like.

  Although the thickness of the light-shielding ink layer 208 depends on the concentration of the black pigment or dye in the ink, it is generally sufficient as long as it can sufficiently block ultraviolet rays and visible rays. The thickness of the aluminum foil 212 is preferably 3 to 15 μm, more preferably 7 to 12 μm.

(6) Sealant Layer The layer that is heat-sealed to the upper end flange portion 1a of the container body 1 is the sealant film 211 or the hot melt layer. The sealant film 211 can be formed of a polyethylene film, an unstretched polypropylene film, an ionomer resin film, a polystyrene film, or the like. Further, the sealant film 211 preferably has an easy peel property so that the lid body 2 can be easily peeled off from the container body 1. Therefore, the sealant film 211 preferably has a relatively weak thermal adhesiveness. Known hot melts can be used.

  As the sealant film 211, for example, a laminated film having a polyethylene base film and a low molecular weight polyethylene film in order from the paper sheet 204 side can be used. The thickness of this polyethylene base film is preferably about 10 to 40 μm, more preferably about 20 to 30 μm. The thickness of the low molecular weight polyethylene film is preferably about 5 to 20 μm, more preferably about 7 to 15 μm. Such a laminated polyethylene film is commercially available, for example, as 760FD (manufactured by Toray Synthetic Film Co., Ltd.). As the sealant film 211, a film made of a mixture of ethylene-vinyl acetate copolymer (EVA) and polyethylene can also be used. In the film made of this mixture, linear low density polyethylene (LLDPE) is preferable as polyethylene. The thickness of the film made of this mixture is also preferably about 10 to 40 μm, more preferably about 20 to 30 μm. The thickness of the hot melt layer is preferably 10 to 50 μm, more preferably 20 to 40 μm.

As the sealant film 211, a linear ethylene/α-olefin copolymer obtained by copolymerizing ethylene and an α-olefin having 3 to 18 carbon atoms [density (JIS K6922): 0.870 to 0.910 g /Cm 3 , MFR (JIS K6921, 190°C, 2.16 kg load): 1 to 100 g/10 minutes] and a sealant film (Japanese Patent Laid-Open No. 2004-26190) made of a resin composition containing polystyrene. When the lid body 2 having the heat-sealing layer made of the sealant film is heat-sealed to the container body 1, both the sealing property and the easy-opening property can be achieved.

  In order to impart excellent linear tearability to the lid body 2, the sealant film 211 may be formed with a large number of substantially parallel linear scratches and/or a large number of fine holes.

(7) Adhesive Layer The adhesive layer is not particularly limited, but is preferably made of a film-like plastic having adhesiveness. For example, when the paper sheet 204 has a printing layer such as letters and patterns on the upper surface, it is preferable to use a transparent adhesive for the layers 202 and 203 (203a, 203b) that adhere the curling plastic film 201 and the paper sheet 204. The transparent adhesive is not particularly limited as long as it has transparency. For example, polyurethane resin (for example, trade name "Rockbond RU-40", manufactured by Rock Paint Co., Ltd.), epoxy resin, acrylic resin, ethylene-vinyl alcohol. Examples thereof include a copolymer resin (EVA), a polyvinyl acetal resin (for example, polyvinyl formal, polyvinyl butyral (PVB resin), modified PVB, etc.), a vinyl chloride resin and the like.

  For the adhesive layers 205, 206 (206a, 206b), 208 and 209 below the paper sheet 204, hot melt, extrusion laminated polyethylene, etc. can be used.

(8) Partial Easy Release Layer The material forming the partial easy release layer 23 (23a, 23b, 23c) is an acrylic resin, a polyamide resin, a polyester resin, a butyral resin, a vinyl chloride-vinyl acetate copolymer, ethylene- Examples thereof include vinyl acetate copolymer and nitrification cotton. If necessary, a small amount of silicone, wax or the like may be added. The easily peelable layer can be formed by printing an ink containing the above material on the paper sheet 204 or the PBT film 201. The partial easy peeling layer 23 may be formed by coating the upper surface or the lower surface of the adhesive layer, but as shown in FIG. 5, the dot easily peeling resin may be evenly distributed in the adhesive layer. good. Since the partial easy peeling layer 23 must be accurately positioned with respect to each of the half cuts 24a to 24e, 29, 283, 293 and 294, when the original fabric (laminated sheet 20) of the lid body 2 is formed, It is preferably made by a method such as gravure printing in alignment with the printed layer of the sheet 204 or the plastic film 201.

[3] Pre-processing of each film (1) Formation of linear scratches In order to enhance the tearability of the lid 2, at least one of the curling plastic film 201, the rigid plastic film 207, and the sealant film 211 is Multiple substantially parallel linear scratches may be formed by the method described.

  In order to achieve both film strength and good linear easy tearability, the depth of linear scratches is preferably 1 to 40% of the thickness of each film, specifically 0.1 to 10 μm. Is preferred. The width of the linear scratches is preferably 0.1 to 10 μm, and the interval between the linear scratches is preferably 10 to 200 μm.

  In order to form linear scratches on each of the films 201, 207 and 211, for example, the method disclosed in WO 03/091003 can be adopted. In this method, a large number of substantially parallel linear scratches are formed on the film by slidingly contacting a continuously running film against a large number of rolls or plates having Mohs hardness of 5 or more on the surface thereof. Diamond particles are preferred as the particles. As a means for pressing the film against the roll or plate, a means for blowing air or a brush that makes sliding contact with the film is preferable. Since the linear scratches obtained by this method do not penetrate the film, even if a PET film having linear scratches is used as the rigid plastic film 207, sufficient aroma retaining property and gas barrier property can be secured. .

  The linear scratches are preferably formed entirely on at least one surface of each of the films 201, 207 and 211. Thereby, each of the films 201, 207, and 211 is provided with linear easiness of unidirectional irrespective of the orientation of the film itself, and can be linearly torn from any portion along the linear mark.

(2) Formation of Micropores In order to enhance the easy tearability of the lid 2, a large number of micropores are formed on at least one of the curling plastic film 201, the rigid plastic film 207 and the sealant film 211 by the method described below. You may form in.

The micropores preferably have an average opening diameter of 0.5 to 100 μm and a distribution density of about 500 pores/cm 2 or more. If the distribution density of the micropores is less than about 500 holes/cm 2 , the tearability is insufficient. From the viewpoint of film strength, the distribution density of fine pores is more preferably 1×10 3 to 1×10 4 holes/cm 2 , and particularly preferably 1×10 3 to 5×10 3 holes/cm 2. preferable.

  In order to form fine holes in each of the films 201, 207 and 211, for example, the method disclosed in Japanese Patent No. 2063411 and Japanese Patent Laid-Open No. 2002-59487 can be adopted. For example, in the method of Japanese Patent No. 2063411, a first roll (same as the above-mentioned linear scratch forming roll) on which a large number of fine particles having a Mohs hardness of 5 or more having sharp corners adhere to the surface and the surface is smooth Since the film passes between the second roll and the second roll while receiving a uniform pressing force, many fine holes are formed in the film. As the second roll, an iron-based roll plated with Ni, Cr, or the like, a stainless-based roll, a special steel roll, or the like can be used.

  When forming the fine holes in the sealant film 211, the fine holes may be through holes or non-through holes. When the micropores are provided in the curling plastic film 201 or the rigid plastic film 207, it is preferable that the micropores are non-penetrating holes from the viewpoint of the sealing property of the container. By adjusting the pressing force between the first roll and the second roll, one or both of the through hole and the non-through hole can be formed.

[4] Manufacturing method of lid (1) Manufacturing method of laminated sheet For example, when the laminated sheet 20 shown in FIG. 4 is formed, an adhesive layer including partial easily peelable layers 23a and 23b on the upper surface of a long paper sheet 204. And a curling plastic film 201 is laminated on the upper surface side, and a rigid plastic film 207, a light-shielding ink layer 208, and a sealant film 211 are laminated on the lower surface side. . If necessary, each film 207 or 211 may be previously provided with a large number of substantially parallel linear scratches and/or a large number of fine holes. The easy tear direction of each film 207 or 211 is made to coincide with the longitudinal direction of the long paper sheet 204.

  When laminating the curling plastic film 201 on the paper sheet 204, it is preferable to adhere the curling plastic film 201 to the paper sheet 204 in a state of being stretched in the MD direction within the elastic deformation region (elongation of 1 to 3%). preferable. Thereby, the curl property can be imparted to the laminated sheet 20.

  In order to perform stretching of 1 to 3%, it is sufficient to apply a tension of 10 to 20 kgf/m width to the curling plastic film 201. When the curl plastic film 201 is adhered to the paper sheet 204 without being stretched, the tension applied to the curl plastic film 201 is 5 kgf/m width or less. PBT is suitable as the resin that can be stretched elastically.

  The laminated sheet 20, which is adhered to the paper sheet 204 while applying tension to the curl plastic film 201, has curl properties that warp the curl plastic film 201, and thus the curl plastic film 201 is wound outside. As a result, the laminated sheet 20 does not substantially curl when rewound (of course, the laminated sheet 20 curls over time). Since the laminated sheet 20 remains flat for a while, it does not hinder the work of punching/heat sealing the lid 2. When the heat-sealed lid body 2 is peeled off from the container body 1, the lid body 2 is in a curled state.

  When a PBT film is used as the curling plastic film 201, it is possible to store the curled shape in the laminated sheet 20 by utilizing the shape memory property of PBT. In order to produce the PBT laminated sheet 20 in which the curl shape is stored, for example, two methods described in WO 2004/026577 can be adopted.

In the first method, (a) the laminated sheet 20 containing the PBT film is shaped (cold working) at a temperature T 1 that is equal to or lower than the glass transition temperature Tg of PBT while maintaining the curled shape, and (b) imparted. The shaped laminated sheet 20 is deformed into a flat shape at a temperature T 2 exceeding Tg, and (c) is cooled to a temperature T 3 equal to or lower than Tg and fixed to the flat shape. In the second method, (a) (i) the laminated sheet 20 containing the PBT film is subjected to a shaping treatment at a temperature T 4 higher than Tg and lower than the melting point while keeping the curled shape, or (ii) the PBT film is curled. After the shape-forming treatment is performed at a temperature T 4 while maintaining the shape, the laminated sheet 20 having a curl shape is produced by laminating the laminated sheet 20 with the film laminated body including the paper sheet 204. secured to curled shape is cooled to a temperature T 5 of, (c) to deform into a flat shape at a temperature T 6 of the shaped laminated sheet 20 Tg ultra ~T less than 4, (d) Tg below the temperature T 7 It consists of cooling down to a flat shape. Although the shape memory PBT laminated sheet 20 produced by these methods is flat, the lid body 2 stamped/heat-sealed from it has recovered the curl property, and therefore it curls when peeled from the container body 1.

(2) Punching/Half-Cut Processing As shown in FIG. 30, when the laminated sheet 20 is placed with the side of the curling plastic film 201 facing upward, and punching/half-cutting is performed by a plurality of punches, a plurality of punched/half-cut processings are performed at one time. The lid body 2 can be manufactured. The punching/half-cutting process itself can be performed by a known method. The direction of the pair of cuts 22a and 22b, the half cuts for opening 24a and 24b, the U-shaped half cut 29, and the half cuts 283, 293, and 294 for forming the hot water spout is aligned with the longitudinal direction of the long paper sheet. The punching process and the half-cutting process may be performed simultaneously or continuously.

  As described above, the present invention has been described with reference to the drawings, but the present invention is not limited thereto and various modifications can be made without changing the gist of the present invention. For example, the position of the partially easily peelable layer in the layer may be anywhere as long as one of the peeled layers has a large curl property.

Claims (27)

  1. A container sealing lid having a paper sheet, a curling plastic layer, and a partially easily peelable layer and sealed in a container with the paper sheet lower than the curling plastic layer, the outer peripheral edge And a tear start point provided on both sides of the tear tab section, and the partial easily peelable layer is provided outside a tear direction extension line of the tear start point. A lid for sealing a container, which is characterized in that:
  2. The container sealing lid according to claim 1, wherein the partially easily peelable layer is formed from the tear start point to a position beyond the center of the lid.
  3. The lid for container sealing according to claim 1 or 2, wherein a peeling stop mark is provided on the lid, and the partially easy peeling layer is formed from the tear start point to the position of the peeling stop mark. A lid for sealing a container, which is characterized in that
  4. The lid for container sealing according to any one of claims 1 to 3, wherein a half-cut for opening is provided on the lower side of the lid along each tearing direction extension line of the tearing start point. And a lid for sealing the container.
  5. The container sealing lid according to claim 4, wherein the opening end of the opening half cut is slightly separated from the tear starting point.
  6. The lid for container sealing according to claim 4 or 5, wherein the lid comprises a laminated sheet having at least a curling plastic film, a paper sheet and a heat-sealing film in order from the top surface, and the half-cut for opening is A lid for container sealing, which reaches at least the paper sheet in the laminated sheet.
  7. The lid for container sealing according to claim 6, wherein the half-cut for opening reaches a depth of at least about 30% of the thickness of the paper sheet.
  8. A container sealing lid having a paper sheet, a curling plastic layer, and a partially easily peelable layer and sealed in a container with the paper sheet lower than the curling plastic layer, the outer peripheral edge An opening tab portion provided on the opening portion, a tab portion peeling half cut provided on the lower surface side of the opening tab portion, and an engraved on the lower side of the lid body on the center side of the tab portion peeling half cut. An annular half cut for forming a pouring port, wherein the partially easily peelable layer is provided so as to surround the annular half cut for forming a pouring port.
  9. 9. The container sealing lid according to claim 8, wherein the partially easily peelable layer is formed from the half cut for peeling the tab portion to a position beyond the center of the lid. Lid.
  10. The lid for container sealing according to claim 8 or 9, wherein a peeling stop mark is provided on the lid, and the partially easy peeling layer is formed by removing the peeling stop mark from the half-cut for peeling the tab portion. A lid for container sealing, which is formed up to the position.
  11. The lid for container sealing according to any one of claims 1 to 10, wherein the lid has a tap portion forming tab portion in addition to the opening tab portion, and the tap portion forming tab portion is Each U-shaped half cut has a pair of cuts and a plurality of substantially U-shaped half cuts carved on the lower side of the lid body with the open end facing inward between the cuts. Is composed of a pair of straight portions and a connecting portion of both straight portions, and the cut and the tip of the U-shaped half cut are both located in the seal portion of the lid, and the U-shaped half cut is formed. A partially easily peelable layer for forming a hot water spout is provided between the enclosed portion and each straight line extending in the opening direction of the tab portion for hot water spout formation from the tips of the pair of straight line portions. A lid for sealing a container.
  12. The container for instant food according to claim 11, wherein the direction of easy tearing of the lid is substantially coincident with the direction of the cut, and thus the lid is held by the container for holding the hot water spout forming tab portion. When peeled off from the main body, the lid was torn from the cut and the tip of the U-shaped half cut, and the portion on the lower surface side of the partially easy peeling layer for forming the hot water spout was brought into close contact with the upper flange portion of the container main body. A container for instant foods, characterized by remaining as it is and forming a plurality of hot water drainage openings.
  13. The container for instant foods according to claim 11 or 12, wherein the U-shaped half cut has a depth from the lower surface of the lid to the partial easily peelable layer.
  14. The lid for sealing a container according to any one of claims 11 to 13, wherein the partly easily peeling layer for forming a hot water spout is a peeling stop mark for the tab part for forming a hot water spout from the U-shaped half cut. A lid for container sealing, which is provided up to the position.
  15. The lid for container sealing according to any one of claims 11 to 14, wherein the pair of linear portions of the U-shaped half cut are inclined so that the distance between them becomes narrower toward the front. Lid.
  16. The container sealing lid according to any one of claims 11 to 15, characterized in that a pair of line portions that are inclined so that the distance becomes wider toward the front is provided at the ends of the pair of cuts. A lid for sealing a container.
  17. The lid for container sealing according to any one of claims 11 to 16, wherein a tip of the cut and a tip of a pair of linear portions of the U-shaped half cut are on an outer peripheral side with respect to a center line of a seal portion of the lid. A lid for sealing a container, characterized in that
  18. The lid for container sealing according to claim 17, wherein the position of the tip of the cut and the tip of the pair of linear portions of the U-shaped half cut in the seal portion is 30 to 50 of the width of the seal portion from the outer circumference. A lid for sealing a container, which is in the range of %.
  19. The container sealing lid according to any one of claims 11 to 18, wherein a half cut for forming a hot water spout is provided on a straight line extending from each tip of the cut in the opening direction. body.
  20. The lid for sealing a container according to any one of claims 11 to 19, wherein a half cut for forming a hot water spout is formed below the lid along a straight line extending in the opening direction from each tip of the U-shaped half cut. A lid for sealing a container, characterized in that:
  21. The lid for container sealing according to any one of claims 1 to 10, wherein (a) a plurality of rectangular-shaped half-cuts for forming a hot water spout are formed on the lower side of the lid at positions substantially facing the opening tab portion. (B) the partially easily peelable layer extends in the unsealing direction from the tearing start point of the unsealing tab portion, and the area inside the unsealing tab portion or the center of the lid body is formed. (C) a region which does not have the U-shaped partial easy peeling layer, and which has the U-shape and is connected to the crossed region to form a U-shape and surrounds the rectangular-shaped half-cut opening half-cut; A lid for container sealing, characterized in that a half cut for layer separation is engraved on the lower side of the lid along a boundary that is substantially orthogonal to the opening direction among the boundaries with the region having the partially easily peelable layer. .
  22. 22. The lid for sealing a container according to claim 21, wherein, in the U-shaped partial easy peeling layer, a boundary, which is substantially orthogonal to the opening direction, of a boundary with a region not having the U-shaped partial easy peeling layer faces a central portion of the lid. A lid for container sealing, which is provided so as to have a curved shape.
  23. The lid for container sealing according to any one of claims 1 to 22, wherein the curling plastic layer is made of a polybutylene terephthalate film.
  24. The container sealing lid according to any one of claims 1 to 23, further comprising a curling plastic layer, a paper sheet, an adhesive layer, a rigid plastic film, and a sealant layer from the upper surface side, and the partial easy peeling layer is the A container sealing lid, which is provided on an adhesive layer.
  25. The container for instant foods according to claim 24, wherein the rigid film is made of a uniaxially oriented or biaxially oriented polyethylene terephthalate film having a different degree of orientation.
  26. The lid for container sealing according to claim 24 or 25, wherein the partially easily peelable layer is on the upper surface or the lower surface of the adhesive layer, or in the same plane as the adhesive layer. ..
  27. The lid for container sealing according to claim 26, wherein adhesive plastic films are provided on both sides of the partially easily peelable layer.
JP2005512032A 2003-07-25 2004-07-23 Container sealing lid with excellent opening retention Expired - Fee Related JP4353944B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2003280364 2003-07-25
JP2003280364 2003-07-25
PCT/JP2004/010494 WO2005009868A1 (en) 2003-07-25 2004-07-23 Cover body for sealing container with excellent unsealing retainability

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JPWO2005009868A1 true JPWO2005009868A1 (en) 2006-11-02
JP4353944B2 JP4353944B2 (en) 2009-10-28

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CN1829642A (en) 2006-09-06
WO2005009868A1 (en) 2005-02-03

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