JPH0741929B2 - Metal-plastic composite lid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite lid made of metal and plastic, which is suitable as a hermetically-sealing lid for a container for containing a liquid medicine such as a liquid medicine for injection or a drip, and more specifically, a top plate. A metal outer lid having an opening at the center of the opening and a fixing skirt around the opening, and a plastic outer lid that is sealingly engaged with the opening and is in close contact with the top plate by controlling the adhesive force. A composite lid consisting of and.

[0002]

2. Description of the Related Art Conventionally, various types of sealing outer lids for containers for containing drug solutions such as injection drug solutions and drip drug solutions have been proposed. For example, JP-A-59-142949 discloses a metal plate having a top plate having a hole, a skirt portion hanging down from the peripheral edge of the top plate, and a plastic plate-like body for closing the hole. The plastic plate-like body is formed with a thin portion defining an removable portion for opening inside the hole, and the removable portion has a knob portion protruding outward. Is formed as a single body, and the plastic plate-shaped body is formed by press molding so that the peripheral portion sandwiches the outer surface and the inner surface of the peripheral edge portion of the hole portion of the top plate, and the peripheral portion is the top surface. A cap is described which is characterized in that it is in close contact with the edges of the holes of the plate.

The cap disclosed here is also intended as a hermetically-sealing lid for a chemicals container, in which a plastic plate-like member is arranged in a state in which a hole formed in a top plate of a metal shell is closed. Since the plastic plate-like body is formed so that its peripheral portion sandwiches the outer surface and the inner surface of the hole edge portion of the top plate, the metal shell and the plastic plate-like material are closely contacted at the hole edge portion. It is evaluated as a hermetically-sealed lid for a drug solution container because it has no rattling or gaps between them, and has a structure that does not allow dust or germs to enter during steam sterilization, cooling, or storage. .

However, in the cap described above, the plastic plate-like body is only in close contact with the metal shell so as to sandwich the outer surface and the inner surface only at the peripheral portion of the hole, and the metal shell and the plastic plate-like body are engaged. Since it is not adhered, it has a temporary function as a sealing lid during normal steam sterilization treatment and storage, but it is not always sufficient in terms of sealing performance during harsh various treatments and transportation. It's hard to say that you can be satisfied with.

In Japanese Utility Model Laid-Open No. 54-128859, a closed rubber stopper 1, a metal cap 2 and a plastic lid 3 are provided, and the lid 3 is opened with a fingertip and the top of the metal cap 2 is opened. In the medicinal bottle lid having a hole in the center of the surface, the protrusion 3A on the back surface of the plastic lid 3 is inserted into the hole 2A of the base 2, and the lower end periphery 3B of the protrusion 3A is welded to the back surface of the base 2. An annular stripping strip 2B, which is concentric with the hole 2A, is provided on the mouthpiece 2 outside the hole 2A, and the inner surface of the hem portion 3C of the lid body 3 is pressure-bonded to the hem portion 2C of the mouthpiece 2 to block air flow. A vial lid with an annular lip 3D is described.

[0006] In the above-mentioned medicated bottle lid, the protruding portion provided on the back surface of the preformed plastic lid is inserted into the hole of the metal die, and the lower end periphery of the protruding portion is welded to the back surface of the die. The metal cap and the plastic lid are closely engaged only at that portion, and further, the annular rivet is formed so as to be crimped to the skirt of the cap so as to supplementally block the flow of air.

However, like the invention described in the above-mentioned Japanese Patent Laid-Open No. 59-142949, this medicated bottle lid also has a problem in sealing performance during severe various treatments, transportations, and the like. As a result, it is unreliable. As described above, most of the outer lid of this type of container is molded with an olefin resin, and since this resin has almost no adhesiveness to metal, the conventional composite lid has a plastic outer surface. A protrusion is formed on the lower central surface of the lid to engage with the opening of the metal inner lid, both are set in the mold, and the protrusion of the plastic outer lid is melted by the heated punch. At the same time, the engaging portion is formed by welding the periphery of the opening of the metal inner lid, and the both are brought into close contact with each other. As long as there is a technical recognition that the adhesion between the olefin resin and the metal is poor, such engagement in the composite lid is not easy to open during use and should be taken as a matter of course. It can be said to be a means.

However, in all of the conventionally proposed sealing outer lids, the metal lid and the plastic lid are only in close physical contact with each other, and they are not adhered to each other, so that they rotate in the lid circumferential direction. However, when this rotation is repeated, a gap is gradually formed in the engaging portion, which causes the invasion of various bacteria, and the function as the sealing outer cover is lost.

In order to solve the drawbacks of the conventional sealing outer lid, for example, Japanese Patent Laid-Open Nos. 1-213167 and 1-317747 disclose a top plate portion and a fixing skirt portion around the top plate portion. A metal inner lid having an opening at the center of the top plate and a large-diameter top plate that covers the upper surface of the inner lid top plate, a short skirt located on the upper outer periphery of the inner lid skirt, and an inner lid opening And a metal outer lid having a detachable engaging portion for sealing engagement, the metal inner lid at least peelingly adhering to the upper surface of the top plate, that is, an adhesive coating layer, that is, a coating containing a cohesive breaking adhesive. Disclosed is a metal-plastic composite lid having a layer, the plastic outer lid being releasably adhered to the inner lid in the axial direction of the lid through the cohesive adhesive-containing paint layer, and a method for producing the same. There is. This metal-plastic composite lid enhances the insufficient sealing reliability of the conventional sealing outer lid, maintains sufficient sealing reliability even in severe processing and transportation, and is easily peelable when opened. It has a close contact structure as shown.

However, even in these metal-plastic composite lids, the plastic outer lid is not always easy to open. The adhesiveness of the inner lid through the cohesive failure adhesive-containing paint layer is affected by changes in temperature over time,
Further, since the metal inner lid skirt portion and the short skirt portion of the plastic outer lid that covers the outer periphery of the upper portion are not opened, the plastic outer lid plastic molding shrinkage influences the outer lid opening. Further, since the outer lid that has been removed once can be fixed on the inner lid, it is difficult to determine whether it has already been opened or unopened, and even if mischieved by opening it, it cannot be recognized and unauthorized use cannot be prevented.

[0011]

DISCLOSURE OF THE INVENTION The present invention improves the insufficient sealing reliability in the conventional sealing outer lid, maintains sufficient sealing reliability even in severe processing and transportation, and opens the package. At that time, an outer cover for sealing such as a chemical solution storage container having an adhesion structure in which the outer cover is easily peelable from the inner cover is obtained. Further, it is an object of the present invention to obtain a reliable sealing outer lid that cannot be reused once the outer lid is removed from the inner lid and can prevent unauthorized use.

[0012]

According to the present invention, a metal inner lid having a top plate portion, a fixing skirt portion around the top plate portion, and an opening at the center of the top plate portion; an upper surface of the inner lid top plate portion And a plastic outer lid having a large-diameter top plate portion that covers the inner lid skirt portion and a short skirt portion that is located on the outer periphery of the upper portion of the inner lid skirt portion; In a metal-plastic composite lid comprising an adhesive paint layer that adheres releasably, the adhesive force between the adhesive paint layer and the plastic is non-adhesive or weakly adhered to the inner surface or the outer surface of the adhesive paint layer. The adhesive force control agent layer made of a resin obtained by curing a drying oil or a drying oil fatty acid or a resin modified with a drying oil or a drying oil fatty acid for controlling the property is a non-coated portion which is continuous in the circumferential direction. Are partially distributed in the radial direction Metal, characterized in that provided to resident - plastic composite closure is provided.

The plastic outer cover is made of an olefin resin, and the adhesive coating layer preferably contains a cohesive failure adhesive and a modified olefin resin in order to have sealing reliability and easy peeling upon opening. Is. Further, it is preferable that a space is provided between the metal inner lid skirt portion and the short skirt portion of the plastic outer lid located on the outer periphery of the upper portion thereof.

Furthermore, the plastic outer lid is made of an olefin resin, a modified olefin resin-containing adhesive coating layer is provided on the inner surface of the metal inner lid, and the plastic outer lid extends beyond the inner lid opening end edge. It is preferable that an engagement portion that adheres to the inner surface of the opening is provided.

[0015]

The metal-plastic composite lid of the present invention has (i)
An adhesive coating layer is provided between the outer surface of the metal inner lid having an opening at the center of the top plate portion and the inner surface of the corresponding plastic outer lid in a peelable manner, and (ii) the adhesive coating layer. The adhesive force control agent layer for controlling the adhesive force between the adhesive coating layer and the plastic to be non-adhesive or weakly adhered to the inner surface side or the outer surface side of the It is characterized in that it is provided so as to be partially distributed in the direction.

In the composite lid of the present invention, the plastic outer lid and the metal inner lid prevent invasion of germs and water, and prevent accidental detachment even during severe treatment or transportation. However, if the outer lid is pushed up with a finger, it can be easily opened with a relatively small opening force.

Between the outer surface of the inner lid top plate portion made of metal and the inner surface of the outer lid top plate portion of the plastic, an adhesive coating layer is provided to adhere the both in a peelable manner. The inner surface of the top plate of the outer lid is tightly adhered to each other to prevent invasion of germs and water between the inner lid and the outer lid, and prevent accidental detachment of both, and the adhesive coating layer is used when opening. It is possible to obtain an easy opening property by preventing peeling and increasing the opening force. As this adhesive coating, an adhesive coating containing a cohesive failure adhesive is suitable.

The cohesive failure adhesive is a material that maintains the adhesion (adhesiveness) between the coating film and the plastic and has a relatively small cohesive force of itself, so that it easily breaks upon peeling. .

Preferably, the plastic outer cover is made of an olefin resin, and the adhesive coating contains a modified olefin resin for improving adhesiveness and a cohesive failure adhesive in a specific weight ratio range. .

In the present invention, the provision of an adhesive force control layer (hereinafter also referred to as a masking layer) on the inner surface side or the outer surface side of the adhesive coating layer means that the adhesive force of the adhesive coating layer at that portion is not adhered. It controls the adhesiveness to weak adhesion, and it can reduce the distortion of the adhesive layer due to the entire surface adhesion and the tag tightening effect due to molding shrinkage, and the adhesion position and the adhesion area of the inner surface of the outer lid and the outer surface of the inner lid can be reduced. By appropriately changing, the sealing reliability is maintained and the opening force at the time of opening is reduced to enable easy opening performance.

The masking layer is provided on the outer surface of the inner lid top plate portion and the outer surface of the inner lid skirt portion so that the inner surface of the outer lid top plate portion and the outer surface of the inner lid top plate portion are partially adhered to each other. It is provided. The non-coated portion of the masking layer, that is, the bonding position between the inner surface of the outer lid top plate and the outer surface of the inner lid top plate is provided so as to be continuous in the circumferential direction but partially distributed in the radial direction. , The sealing reliability is sufficiently maintained. It is preferable that the bonding positions are provided at least double outside the central opening of the inner lid top plate and directly inside the outer edge corners in order to maintain the sealing reliability. Further, the masking layer is provided on the skirt portion from the outer edge corner of the outer surface of the inner lid top plate portion to prevent the shear peeling force generated at the time of opening due to the adhesion of the skirt portion, thereby enabling easy opening.

Further, by leaving a space between the metal inner lid skirt portion and the short skirt portion of the plastic outer lid that covers the outer periphery of the upper portion, the tag tightening force due to the molding shrinkage of the plastic outer lid is the outer lid opening force. Can be prevented remarkably, and the outer lid once removed cannot be fixed on the inner lid, so it cannot be reused after opening, thus preventing unauthorized use and mischief and improving the sealing reliability. .

Further, the plastic outer lid is made of olefin resin, and the modified olefin resin-containing adhesive coating is provided on the inner surface of the metal inner lid, and the plastic outer lid is bonded to the inner surface of the inner lid opening beyond the edge of the inner lid opening. The provision of one or more engaging pawls as the engaging portion for the entire circumference or a part thereof prevents accidental detachment of the outer lid and further prevents the engaging pawls from scattering during opening. Furthermore, since a light breaking noise is generated when the engaging claws are broken at the time of opening, it is possible to determine whether it is the first opening or the reopening, so that the sealing reliability is improved.

The adhesive strength of the adhesive coating that adheres to the outer surface of the metal inner lid in a peelable manner is in the range of about 1.0 to 3.0 kgf in a 15 mm width 90 ° peel test in terms of sealing reliability and easy opening. Works well with. Also, the adhesive strength of the modified olefin resin-containing adhesive coating on the inner surface of the metal inner lid is preferably about 4 kgf or more in a 15 mm width 90 ° peel test.

[0025]

PREFERRED EMBODIMENTS OF THE INVENTION In an example of a cross-sectional view of a composite closure of the composite closure present invention "FIG. 1", composite closure A of the present invention consists of a metallic inner lid 1 and the plastic outer lid 10. The metal inner lid 1 is formed of a metal plate such as an aluminum thin plate, and has a top plate portion 2, a skirt portion 3 for fixing the vial jaw portion around the top plate portion 2, and an opening 4 at the center of the top plate portion. The outer lid 10 is formed, and has a large-diameter top plate portion 11 that covers the upper surface of the inner lid top plate portion, and a short skirt portion 12 located on the outer periphery of the upper portion of the inner lid skirt portion 3.
The inner lid opening portion 4 has a jaw portion 13 which is closely attached so as to cover the edge thereof.

On the outer surfaces of the top plate portion 2 and the skirt portion 3 of the inner lid 1, a cohesive fracture adhesive-containing adhesive coating film 5 is provided, and the upper surface of the coating film 5 is directly exposed to the opening of the inner lid top plate portion. A masking ink layer 6 which is continuous in the circumferential direction is provided from the top plate portion to the upper portion of the skirt portion excluding the double belt-shaped ring portions which are continuous in the circumferential direction and outside and immediately inside the outer edge corners. The masking ink layer 6 reduces the adhesive force of the cohesive failure adhesive-containing adhesive coating film 5 on the lower surface to non-adhesive or weakly adhesive. The outer surface of the inner lid and the inner surface of the outer lid are adhered to each other via the adhesive coating film 5 on the uncoated portion of the masking ink layer 6 on the upper surface of the inner lid top plate portion, and the outer surface of the inner lid top plate portion and the inner surface of the outer lid top plate portion are bonded to each other. It is in close contact. Further, a coating film 7 of the modified olefin resin-containing adhesive paint is provided on the inner surface of the inner lid.

A gap 15 is provided between the inner lid skirt portion 3 and the short skirt portion 12 of the outer lid which covers the outer periphery of the upper lid. Opening the gap prevents the influence of the tab fastening force due to the molding shrinkage of the outer lid plastic on the outer lid opening force, and facilitates the opening. In addition, once the outer lid is removed, it cannot be fixed on the inner lid, so it is easy to open it, which helps prevent mischief and unauthorized use. However, of course, the gap 15
Alternatively, the inner lid skirt portion 3 and the outer lid skirt portion 12 may be adjacent to each other without the provision. "FIG. 2" In this case, in the figure, the masking ink layer 6 is provided so as to further extend to the lower part to prevent the adhesion of both skirt portions. As a result, although it is inferior to the case where the gap 15 is provided as shown in FIG. 1, the shear peeling force generated at the time of opening due to the adhesion of the skirt portion is prevented and the easy opening property is enabled.

In FIG. 1 and FIG. 2, the cohesive failure adhesive-containing coating film 5 is provided on the entire outer surface of the inner lid, but only the top plate 2 may be provided. The inner lid and the outer lid are adjusted so as to maintain the sealing reliability and reduce the outer lid opening force by changing the position and area of the uncoated portion of the masking ink layer 6 on the inner lid top plate portion, that is, the bonding position. You can Since the entire surface is not adhered, no adhesion distortion occurs and the adhesion is good.
An example of the masking ink layer-applied portion 6 and the unapplied portion (exposed portion of the adhesive coating film 5) on the top plate of the inner lid is shown in FIG. In FIG. 3A , the adhesive coating film 5 is exposed in the shape of a single ring just outside the central opening 4, and the other part is covered with the masking ink layer 6. In “FIG. 3” B and “FIG. 3” C , a ring-shaped adhesive coating film 5 is formed directly outside the central opening 4.
And the masking ink layer 6 is sandwiched between them, and the adhesive coating film 5 is left in a single and double ring shape. "Figure
In 3 "D , the adhesive coating film 5 is exposed in a ring shape immediately outside the central opening 4, the adhesive coating film 5 is left in a mountain corrugated ring shape outside, and the masking ink layer 6 is provided on the other portions. There is. All of these exposed adhesive coating films 5 are continuous in the circumferential direction. Preferably, "Fig. 3" B, "Fig.
3 ”C and“ FIG. 3 ”D , a ring-shaped uncoated portion is provided immediately outside the central opening, and a ring, mountain corrugation, corrugated ring, etc. is further provided between the outer edge corner and the double ring. The above is preferable.

Although the masking ink layer 6 is provided on the upper surface of the adhesive coating film 5, it may be provided on the lower surface. The masking ink layer is easy to print,
By providing the masking ink layer, the adhesion position and the adhesion area can be appropriately selected.

The plastic outer lid 10 is preferably made of plastic having a range of molding shrinkage and bending stiffness. The molding and bonding of the outer lid 10 are performed by the method described in detail later. The inner lid opening 4 and the outer lid 10 have the above-described shapes, a part of the inner surface of the outer lid covers the edge of the opening of the inner lid made of metal, and the contact portion between them is the adhesive containing the cohesive destructive adhesive. It is most common to form a close-contact structure by adhering through the conductive coating layer 5, but the outer lid is formed so as to form the engaging portion 14 that adheres to the inner surface of the opening beyond the edge of the inner lid opening. Can also be melt-molded. Engaging part 14
Can be provided over the entire circumference or can be partially provided at a plurality of locations. 1 and 2 show a cross section in which the engagement portion 14 is not provided on the left side of the center and a cross section in which the engagement portion 14 is partially provided on the right side.

The provision of the engaging portion 14 prevents the outer lid from accidentally falling off. Further, since the engaging portion (claw) 14 is adhered to the inner surface of the inner lid by the adhesive coating layer 7 on the inner surface of the inner lid, the broken claw 14 is prevented from scattering at the time of opening.

The outer lid is made of various plastics, for example, olefin resins such as polyethylene, polypropylene, propylene-ethylene copolymer and propylene-butene 1 copolymer; acrylonitrile-styrene-butadiene (A).
BS) resin; impact-resistant styrene resin; acrylic resin; nylon resin; polyester resin; polycarbonate resin and the like.

The outer lid generally has a molding shrinkage of less than 5%, in particular less than 3% and 3000 to 13000 kg / cm ² especially 4
It is preferably composed of a plastic having a flexural modulus of 000 to 11000 kg / cm ² . These properties are closely related to the ease of opening the outer lid. If the molding shrinkage ratio of the outer lid plastic is larger than the above range, a squeezing force acts between the inner lid skirt portion and the outer lid skirt portion, the opening force becomes abnormally large, and the easy-open property tends to deteriorate. There is. Providing a gap between both skirts without adjoining them helps to alleviate the tightening force. In addition, the small molding shrinkage prevents the outer lid from peeling off due to the rising of the outer lid at the corner portion. If the flexural rigidity of the outer lid becomes larger than the above range, the peeling force becomes abnormally large because the peeling of the adhesive between the top surface of the inner lid top plate and the inner surface of the outer lid becomes simultaneous. Is less than the above range, the outer lid pushing force is not sufficiently transmitted to the outer lid top plate portion, and in either case, the easy-open property tends to be deteriorated. By using plastic with a molding shrinkage ratio in the above-mentioned small range, it is possible to reduce the tightening force of the hook and effectively perform upward displacement of the outer lid, and at the time of opening the outer lid top plate part. While the push-up force is being sufficiently transmitted, the outer lid top plate portion can be appropriately warped to promote the peeling from the one end portion to achieve easy opening.

The molding shrinkage rate and bending rigidity rate of the plastic constituting the outer lid are related to the type of resin and the compounding amount of the filler. Molding shrinkage varies depending on the type of resin. For example, low density polyethylene is large, polypropylene is lower, and polycarbonate is significantly smaller.
Therefore, if the molding shrinkage ratio and the bending rigidity ratio of the resin alone are within the above ranges, it can be used. Further, when the filler in the resin is contained, the molding shrinkage rate decreases and the bending rigidity rate increases as the blending amount of the filler increases. Thus, the desired molding shrinkage and flexural rigidity can be obtained by selecting the type of resin, or by further selecting the blending amount of the filler. Further, the filler can be contained for the purpose of coloring. The preferred resins in terms of cost and moldability are high density polyethylene and polypropylene.

As inorganic fillers, inorganic white pigments such as rutile or anatase type titanium dioxide, zinc white, and gloss white; barite, precipitated barium sulfate, calcium carbonate, gypsum, precipitated silica, aerosil, talc,
White extenders such as calcined or uncalcined clay, barium carbonate, alumina white, synthetic or natural mica, synthetic calcium silicate, magnesium carbonate, barium carbonate; black pigments such as carbon black and magnetite; red pigments such as red iron oxide; Yellow pigments such as Siena; blue pigments such as ultramarine blue and cobalt blue can be mentioned, but the inorganic filler that can be used in the present invention is not limited to those exemplified above.

These inorganic fillers preferably have an average particle size in the range of 0.05 to 20 μm so that they can be easily and uniformly dispersed in the resin. Then, the specific gravity is preferably in the range of 2.0 to 9.0. Furthermore, in terms of hiding and barrier properties, J
The hiding power according to IS K-5101 is 50 cm ² / g or more.

The filling amount when the inorganic filler is filled and used varies depending on the type and physical properties of the resin, the coloring and the degree of hiding, etc., but is usually 0.1 to 30% by weight, especially 0.1% by weight based on the resin.
It is preferably in the range of 2 to 20% by weight. Further, various organic pigments can be used by filling them for coloring.

As the metal plate constituting the inner lid, a soft metal plate formed of pure aluminum or an aluminum alloy, and a surface-treated steel plate such as tin plate, tin-free steel, nickel-plated plate are used, and the thickness thereof is generally 0.1
It is preferably in the range of 5 to 0.3 mm, particularly 0.2 to 0.25 mm.

The paint used in the adhesive paint layer is preferably one having excellent adhesion to metal and excellent corrosion resistance. Such paints are thermosetting resin paints such as phenol-
Formaldehyde resin, furan-formaldehyde resin, xylene-formaldehyde resin, ketone-formaldehyde resin, urea formaldehyde resin, melamine-formaldehyde resin, alkyd resin, unsaturated polyester resin, epoxy resin, bismaleimide resin, triallyl cyanurate resin, thermosetting Acrylic resin, silicone resin, oil resin, or thermoplastic resin coating, for example, vinyl chloride-vinyl acetate copolymer, vinyl chloride-maleic acid copolymer, vinyl chloride-maleic acid-vinyl acetate copolymer, acrylic Examples thereof include polymers and saturated polyester resins. These resin paints alone
Also used in combinations of more than one species.

A preferred paint is a paint composed of an epoxy resin component and a hardener resin component therefor, such as an epoxy-phenolic paint. Although not absolutely necessary, when peeling adhesion between the metal and the plastic cannot be obtained, it is preferable to use a cohesive failure-causing adhesive in this paint.

The cohesive-breaking adhesive agent is not limited to this, but the following ones are used. 1. Aliphatic hydrocarbons Synthetic paraffin Petroleum wax Petrolatum

2. Fatty acids, fatty alcohols, higher fatty acids Fatty acids obtained from animal or vegetable fats and oils and hydrogenated fatty acids thereof, having 8 to 22 carbon atoms Hydroxystearic acid Linear aliphatic monohydric alcohol Animal or vegetable fats and oils Or those having 4 or more carbon atoms obtained by reducing those fatty acid esters or decomposing and distilling natural wax Tridecyl alcohol

3. Polyglycol Polyethylene glycol Molecular weight of 200 to 9500 Polypropylene glycol Molecular weight of 1000 or more Polyoxypropylene-polyoxyethylene-block polymer Molecular weight of 1900 to 9000

4. Amide, amine higher fatty acid amide oleyl palmitamide amide stearyl erucamide 2 stearothermophilus bromide ethyl stearate ethylenebis fatty acid amide NN 'oleyl stearyl ethylenediamine NN' bis (2-hydroxyethyl) alkyl (C ₁₂ -C
₁₈₎ amide NN 'bis (hydroxyethyl) Rauroamaido N-alkyl (C ₁₆ -C ₁₈₎ fatty acid diethanol di (hydroxyethyl oleate reacted with trimethylene diamine) distearate of diethylenetriamine monoacetate

5. Fatty acid esters of monohydric and polyhydric alcohols n-butyl stearate hydrogenated rosin methyl ester dibutyl sebacate <n-butyl> dioctyl sebacate <2 ethylhexyl, n-octyl co> glycerin fatty acid ester glycerin lactostearyl pentaerythritol stearic acid Ester pentaerythritol tetrastearate sorbitan fatty acid ester Polyethylene glycol fatty acid ester Polyethylene glycol monostearate Polyethylene glycol dioleate Polyethylene glycol monooleate Polyethylene glycol dioleate Polyethylene glycol palm fatty acid ester Polyethylene glycol tall oil Fatty acid ester Ethanediol montanic acid ester 1,3 butanediol montanic acid ester Diethylene glycol stearic acid ester Propylene glycol fatty acid ester

6. Triglyceride, wax Hydrogenated edible oil 12-Hydroxystearic acid glycerin ester Hydrogenated fish oil Beef tallow Spam aceti wax Montan wax Carnauba wax Beeswax Wood wax Monohydric aliphatic alcohol and saturated aliphatic ester <Example: hydrogenated whale oil lauryl stearate, Stearyl stearate>

7. Alkali metal, alkaline earth metal, zinc and aluminum salts of higher fatty acids (metal soap)

8. Low molecular weight olefin resin Low molecular weight polyethylene Low molecular weight polyethylene oxide Low molecular weight acid-modified olefin resin

9. Others Propylene glycol alginate dialkyl ketone acrylic copolymer (for example, Modaflow manufactured by Monsanto).

The cohesive failure adhesive is based on the coating resin solid content
It is preferably used in the range of 0.02 to 5% by weight, particularly 0.1 to 2% by weight. The thickness of the coating film is preferably 1.0 to 15 μm, particularly 1.5 to 10 μm. The cohesive failure-causing adhesive compounded in the coating material floats on the surface of the coating film during baking or drying of the coating material, and has the function of causing the coating film and the plastic to adhere to each other in a cohesive failure manner.

When the plastic is made of an olefin resin, the degree of adhesion can be adjusted by blending a modified olefin resin as an adhesion promoting component in the paint. The modified olefin resin or resin composition used for this purpose has the formula In the formula, R is a hydrogen atom or an alkyl group having 4 or less carbon atoms. Polymers or copolymers of olefins such as low density, medium density or high density polyethylene, polypropylene, ethylene-propylene copolymers, polybutene-1,
A polymer obtained by graft-modifying carboxylic acid such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid and itaconic acid, anhydrides, salts, esters and amides of the above carboxylic acids, using polypentene-1 etc. as a trunk polymer. ,
Alternatively, the modified olefin resin may be blended with an unmodified olefin resin.

The ratio of the cohesive failure adhesive to the modified olefin resin is 1: 2 to 1: 300, particularly 1: 4 to 1: 2.
Can be used in a weight ratio of 00.

The adhesive force of the adhesive coating containing the cohesive failure adhesive to the plastic is in the range of about 1.0 to 3.0 kgf in the 90 mm peel test with a width of 15 mm, particularly 1.5 to 2.
A range of about 5 kgf is suitable. If the adhesive force is less than 1.0 kgf, the outer lid may be accidentally peeled off, and if it exceeds 3.0 kgf, the ease of opening the outer lid is reduced.

As the adhesive coating for the inner surface of the inner lid, the same adhesive coating as described above is used, except that it does not contain a cohesive failure adhesive and its adhesive strength to plastic is approximately 15 mm wide at 90 ° peel test. It is preferably 4.0 kgf or more, particularly 5 kgf or more. Adhesive strength of 4.0 kgf or more means that the plastic outer lid crosses the edge of the inner lid central opening and adheres to the inner surface of the inner lid opening. Strengthen the adhesion so that the lid does not come off. Further, it prevents scattering of the engaging portion which remains when the outer lid is opened with a fingertip.

The adhesion control layer (masking ink layer) is
It acts on the adhesive coating layer containing a cohesive failure adhesive to reduce the adhesive force between the plastic outer lid and the adhesive coating layer to non-adhesive or weakly adhesive.

As the resin that can be used, one that can capture oxygen and harden in the presence of oxygen to form a resin-like solid is used, and examples thereof include linseed oil, tung oil, petroleum oil, and dehydrated castor oil. Dry oils; dry oil fatty acids such as linoleic acid, linoleic acid, eleostearic acid, dehydrated ricinoleic acid, and dehydrated castor oil; these dry oils or resins modified with the dry oil fatty acids can be preferably used. Here, a resin modified with a drying oil or a drying oil fatty acid means a resin modified by physically mixing a drying oil or a drying oil fatty acid and a resin chemically modified with a drying oil or a drying oil fatty acid, and It is intended to include a mixture of these. As the modifiable resin, any thermoplastic or thermosetting resin compatible or chemically reactive with the drying oil or the drying oil fatty acid can be used, and examples thereof include rosin and its derivatives, terpene resin, petroleum resin, and rosin. Modified phenol resin, phenol resin, epoxy resin, amino resin such as melamine or urea, oleoresinus resin, alkyd resin, acrylic resin, or vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, Examples thereof include vinyl resins such as vinyl butyral, which may be used alone, or 2
It is also possible to use a combination of two or more species.

The degree of modification can be widely varied depending on the type of resin to be modified, the type of adhesive coating layer, the type of outer cover plastic, etc., but generally, the resin to be modified and the drying oil or drying oil fatty acid are Weight ratio is 70:30 to 20: 8
It is preferable that the range is 0. However, examples of the resin that can be preferably used in the present invention include alkyd resins modified with a drying oil or a drying oil fatty acid, and epoxy resins modified with a drying oil or a drying oil fatty acid.

The masking ink layer is colorless by adding an appropriate solvent, pigment, dye or other drier (for example, kovaldo naphthenate, manganese naphthenate, other metal salt of naphthenate), heat stabilizer, etc. to these resins as necessary. Alternatively, a colored ink can be prepared, and the masking ink layer can be formed using this ink by a conventional method such as lithographic printing, offset printing, letterpress printing, or the like.
The masking ink layer is usually formed by printing a specific pattern on the adhesive coating layer on the metal plate. Conversely, the masking ink layer is formed by printing the masking ink layer on the metal plate, and the masking ink layer is formed on the masking ink layer. A method of forming an adhesive coating layer on the entire surface including the layer and its uncoated portion can also be adopted.

Manufacturing Process In the present invention, the composite lid is formed by molding plastic with the outer surface of the metal inner lid as a part of the mold surface, and temporarily adhering the plastic outer lid and the metal inner lid to the both. It is manufactured by a step of integrating and an integrated metal inner lid and plastic outer lid are subjected to high frequency induction heating under pressure to perform main bonding at the interface between the both.

The molding of the plastic outer lid in the first step can be performed by any means such as compression molding (compression molding) or insert injection molding. However, the former compression molding is advantageous in terms of molding speed and ease of molding. Especially excellent. The high frequency induction heating in the second step is preferably carried out by pressing the forcibly cooled high frequency induction heating coil against the plastic outer lid and energizing the coil, and particularly the metal inner lid having an interface temperature of 170.
It is preferable to heat so that the temperature is up to 230 ° C., and to cool immediately after heating.

Each step of the present invention will be described with reference to the drawings.

In FIG. 4 which shows the overall arrangement of the apparatus used to carry out the method of the present invention, the apparatus is generally referred to as the molding station 20 and the high frequency bonding station 2.
It consists of 1. The molding station 20 is rotatably provided with a compression molding turret 23 including a large number of compression molding dies 22. An inlet turret 24 for supplying the metal inner lid 1 to each mold 22 is provided at the most upstream position of the compression molding turret 23, and the metal inner lid feeder 25 feeds it through an inlet chute 26. The metal inner lid is supplied to each mold 22. An extruder 27 for supplying the outer lid forming plastic to each die 22 is arranged slightly downstream of the inlet turret 24, and the die head 2 of the extruder 27 is disposed.
The plastic melt extruded from 8 is cut into a predetermined amount by a rotary cutter 29 and supplied to each die 22.

"FIG. 5", "FIG. 6", "FIG. 7" and "FIG. 8" for explaining the detailed structure of the compression molding die (compression molding apparatus) 22 and the molding operation.
In the figure, the illustrated compression molding apparatus comprises a male mold generally designated by 30 and a female mold generally designated by 31.

The male mold 30 includes an openable / closable outer member 32. Openable / closable outer member (hereinafter referred to as opening / closing member)
A grip portion 33 for inserting the metal inner lid 1 (adhesive paint layer, masking layer, etc. omitted, not shown) in advance is provided in the central portion of 32, and the grip portion 33 holds the outer grip. It includes a portion 34 and an inner grip portion 35 that is vertically movable in a circular through hole that is formed in the center of the portion 34 and extends substantially vertically. The inner grip portion 35 is the outer grip portion 3 during molding.
4, the grip 33 is formed, but after the molding, the inner grip 35 is pushed up in the substantially vertical direction.
The molded composite lid can act as an ejector cylinder to remove it from the mold.

In the figure, the upper surface of the convex portion of the opening / closing member 32 has a flat surface portion 36 on the outer side and a curved surface portion 37 on the inner side thereof which rises almost obliquely from the concave portion to the upper part of the skirt portion of the inner lid 1. . The curved surface portion 37 which is located inside the upper surface of the convex portion of the opening / closing member 32
By providing the above, a gap is formed between the skirt portion of the plastic outer lid and the skirt portion of the inner lid at the time of molding to prevent the effect of tightening the hooks from being reduced. The shape of the curved surface portion 37 can be variously changed depending on the shape of the skirt portion of the plastic outer lid, the opening degree of the gap between the plastic outer lid and the inner lid skirt portion, and the like. If no space is provided between the plastic outer lid skirt portion and the inner lid skirt portion, such a curved surface portion 37 is not provided,
The upper surface of the convex portion of the opening / closing member 32 may be a flat surface.

A heating / cooling mechanism 38 is incorporated in the male die 30 so that it can be heated and cooled.

The female die 31 is a movable outer member 4 having a substantially cylindrical shape.
0 and a circular through hole 41 formed in the center of the outer member 40
It includes a movable inner member 42 that moves up and down. The lower outer peripheral surface 43 of the outer member 40 is made to correspond to the convex peripheral surface 44 of the opening / closing member 32 of the male die 30. Female 31
The lower inner peripheral surface 45 of the outer member 40 has a space corresponding to the thickness of the plastic outer lid skirt portion surrounding the skirt portion of the metal inner lid 1 inserted into the grip portion 33, and the opening / closing member 32 of the male die 30. The lower end 46 of the inner peripheral surface of the lower portion corresponds to the curved surface portion 37 of the convex portion of the opening / closing member 3 of the male die 30.
It is made to correspond to the flat surface portion 36 on the outer side of the convex portion 2 at the time of molding.

The lower end surface 47 of the movable inner member 42 is engraved with a pattern such as an annular concave portion (or convex portion) according to the shape of the plastic outer lid. Further, the movable inner member 42 is provided with a heating / cooling mechanism 48.

Before the start of compression molding, the male die 30 and the female die 31 are positioned in the state shown in FIG. The inner lid 1 formed of a soft metal such as aluminum is inserted into the grip 33 of the male die 30, and the opening / closing member 32 is closed to fix the inner lid 1. On top of this, the required amount of plastic 50 is supplied in a molten state. Then
The male mold 30 and the female mold 31 are subjected to a front mold closing step as shown in FIG. That is, the outer member 40 of the female die 31 is lowered to the lower limit position shown in FIG. At the lower limit position, the lower inner lower end 46 of the outer member 40 contacts the flat surface portion 36 (contact portion) on the upper surface of the convex portion of the opening / closing member 32, and the outer member 40 stops. By performing this front mold closing step, the lower inner peripheral surface 45 of the outer member 40 of the female mold 31,
Curved surface portion 37 on the upper surface of the convex portion of the opening / closing member 32 in the male die 30
A space defining the skirt portion of the plastic outer lid is formed with (the upper surface on the inner side of the contact portion).

Next, the compression process is performed. That is, as shown in FIG. 7, the inner member 42 of the female die 31 is lowered by a required compression force, and the plastic 50 is compression-molded. Thus, the male opening / closing member 32 and the metal inner lid 1
Also, the top space wall 11 and the skirt portion 12 of the plastic outer lid of the composite lid are attached to the metal inner lid 1 by the die space portion defined between the gripping member 33 and the inner member 42 and the outer member 40 of the female die 31. It is formed in a temporarily bonded state.
The obtained integrated product is removed from the mold by opening the mold and pushing up the inner grip portion 35 in the vertical direction. Next, the opening / closing member 32 of the male die 30 is opened for inserting the next inner lid. (Figure 8)
At this stage, the bonding state between the outer lid and the inner lid in the integrated product (composite lid) is almost as shown in "Fig. 9".

Returning to FIG. 4 again, at the most downstream side of the compression molding turret 23, the metal inner lid-plastic outer lid integrated product formed at the molding station is transferred to the high frequency bonding station 21. A transfer turret 51 is provided. The high frequency bonding station 21 also has a large number of high frequency heating heads 52.
A high-frequency adhesive turret 53 including is rotatably provided.

In FIG. 10 showing the detailed structure of the high-frequency heating head 52, the high-frequency heating head 52 and the vertically movable lid support 54 are provided as a pair in the axial direction around the turret 53. There is. High frequency heating head 52
Is a pressing block 55 and a pressing surface 56 of this block.
High frequency coil 57 embedded on the side, ferrite 58 for increasing efficiency, and coolant passage 59 for forced cooling
have.

On the other hand, the lid supporting body 54 has a tip portion 60 which can be inserted into the inner lid 1 made of metal, and this tip portion is made of an electrically insulating material such as ceramic, and the lid supporting body 54 is The knockout ring 61 is provided so as to be able to move up and down. A refrigerant passage 65 is incorporated in the lid support 54 so that it can be forcibly cooled.

At the supply position of the lid A (the connection position with the transfer turret 51), the lid support 54 is "FIG. 10".
Compared to the state of FIG.
As a result, the plastic outer lid 10 causes the high-frequency heating head 52 to
It is held in a positional relationship so as to face with. Then, the lid support 54 is lifted to move the plastic outer lid 10 to the metal inner lid 1
Press on. At the same time, the coil 57 is energized, an eddy current is induced in the metal inner lid 1, and the metal inner lid 1 is selectively and rapidly heated to the above-mentioned temperature. As a result, the very surface portion of the plastic outer lid 10 that comes into contact with the metal inner lid 1 is melted and the main adhesion is performed. Even at this stage, the engaging claw can be formed. The engaging claws are omitted in the figure. The required energizing time varies depending on the electrical input and the type of plastic, but is generally 0.03 to 1.0.
Seconds, especially 0.05 to 0.6 seconds. When the energization is cut off, the heating head 52 and the lid support 54 are always forcibly cooled. Therefore, the joint is quickly fixed by cooling, and the lid support 5 is fixed sufficiently.
4 descends and the pressure is released. (Figure 11)

The formed composite lid is moved to the outlet turret 62 after the lid support 54 is knocked out from the lid support 54 by descending from the upper end of the knockout ring 61 at the position of the outlet turret 62 shown in FIG. And is discharged to the product hopper 64 through the outlet chute 63. At this stage, the inner surface of the outer lid top plate portion and the outer surface of the inner lid top plate portion are firmly adhered to each other without any gap or potential gap, and the composite lid of the present invention is obtained.

[0076]

[Effect] In the composite lid of the present invention, as described above, the inner surface of the outer lid and the outer surface of the inner lid are continuously provided in the circumferential direction of the adhesive coating layer which is provided with a masking layer and is peelably adhered, but is partially formed in the radial direction. Is substantially adhered by the adhesive surface that is distributed in a distributed manner, and moreover, the inner surface of the outer lid top plate and the outer surface of the inner lid top plate are closely adhered to each other without any gap or potential gap, and as a result, It has excellent hygienic properties because no germs or moisture pass between the outer and inner lids, and it prevents accidental dislodgement even during severe treatment or transportation, and has sufficient sealing reliability. , It is easy to open the outer lid.

Providing a gap between the outer lid skirt portion and the inner lid skirt portion remarkably reduces the tie-fastening effect due to the molding shrinkage of the plastic outer lid, so the opening force of the outer lid is reduced and the ease of opening is improved. . In addition, the outer lid is prevented from being reused after being opened to prevent improper use and mischief, which enhances the sealing reliability.

Providing an engaging portion for adhering the plastic outer lid to the inner surface of the inner lid opening beyond the end edge of the inner lid opening, it is necessary to perform severe processing (retort sterilization, etc.), vibration during transportation, shock, and other accidents. Even the outer lid is prevented from falling off, and the sealing reliability is enhanced. Further, the generation of a breaking sound at the engaging portion at the time of opening contributes to the sealing reliability.

[0079]

EXAMPLES Example 1 Maleic acid-modified polypropylene on the surface of 3.0 PHR,
Diacrylketone-acrylic copolymer as a cohesive failure adhesive (trade name: Modaflow, manufactured by Monsanto Co.) 0.05
Epoxy-phenolic resin-based paint containing PHR was applied, and maleic acid-modified polypropylene 6.0PH was applied to the back surface.
Aluminum plate (A3004-H14, C) with a thickness of 0.23 mm coated with epoxy-phenol resin coating containing R
Flaxseed oil fatty acid-modified alkyd resin containing 0.2% by weight of cobalt naphthenate as a masking ink and 1% by weight of manganese naphthenate on the surface of P-20) [glycerin / phthalic anhydride / linseed oil fatty acid = 1/1 / 1 (molar ratio)] 90 parts by weight, 2 parts by weight of titanium oxide, and 8 parts by weight of mineral spirit were pattern-printed to form a masking ink layer.
An inner lid having a diameter of 20 mm and a hole diameter of 10 mm similar to that shown in FIG.

The adhesive strength of the epoxy-phenol resin coating composition containing the maleic acid-modified polypropylene and Modaflow was 2.0 kgf in a 15 mm width 90 ° peel test.

Next, using the apparatus shown in FIGS. 5 to 8, the bending rigidity was 5500 kgf / cm ² and the molding shrinkage was 1.3.
% Of a polypropylene resin and the inner lid were compression molded and temporarily bonded. The molding conditions are as follows. Male mold temperature 40 ° C Female mold temperature 30 ° C Clamping time 1.8 seconds Next, using the apparatus shown in FIG. 10 , pressurize the polypropylene outer lid and the aluminum inner lid and apply high frequency induction heating to the interface between them. I glued it. With this main bonding, the engaging claws were formed at six places so as to divide the circumference equally. The molding conditions are as follows.

Energization time 0.5 seconds Pressurized cooling time 2.0 seconds After the composite lid thus obtained was sterilized by retort, the sealing property between the inner lid and the outer lid was evaluated with a penetrant, and the penetration of the liquid was observed. There was nothing and the hermeticity was perfect. Next, when the peeling force between the inner lid and the outer lid was measured to evaluate the opening property of this composite lid, it showed a value of 0.8 to 1.4 kgf and had a good easy opening property.

Comparative Example 1 In the same manner as in Example 1 except that the masking ink layer was not provided, compression molding and high frequency induction heating were performed to obtain a composite lid. After the composite lid was sterilized by retort, the sealability of the interface between the inner lid and the outer lid was evaluated with a penetrating liquid. The liquid did not penetrate and the sealability was perfect, but the openability of this composite lid was evaluated. Therefore, when the peeling force between the inner lid and the outer lid was measured, it showed a value of 2.5 kgf or more, and opening was difficult. Comparative Example 2 Instead of the maleic acid-modified polypropylene and modaflow-containing epoxy-phenol resin-based paint (15 mm width 90 ° peel test adhesive strength 2 kgf) used in Example 1, the 15 mm width 90 ° peel test adhesive strength was 0.8 k.
Using a gf acid-modified polypropylene and modaflow-containing epoxy-phenol resin-based paint and without forming a masking ink layer, compression molding and high frequency induction heating were carried out in the same manner as in Example 1 to obtain a composite lid.

After the composite lid was sterilized by retort, the sealability of the boundary surface between the inner lid and the outer lid was evaluated with a penetrating liquid. As a result, penetration of the liquid was observed and the sealing property was insufficient.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a preferred example of a composite lid of the present invention.

FIG. 2 is a vertical cross-sectional view showing another example of the composite lid of the present invention.

FIG. 3 is a plan view showing a pattern example of a masked ink layer-applied portion and a non-applied portion (substantially bonded portion) of the inner lid top plate portion of the composite lid of the present invention.

FIG. 4 is a layout view of the entire manufacturing apparatus for a composite lid according to the present invention.

FIG. 5 is a cross-sectional view showing a main part of a compression molding apparatus for carrying out the compression molding method according to the composite lid of the present invention and an operating procedure thereof.

FIG. 6 is a cross-sectional view showing a main part of a compression molding apparatus for carrying out the compression molding method according to the composite lid of the present invention and an operating procedure thereof.

FIG. 7 is a cross-sectional view showing a main part of a compression molding apparatus for carrying out the compression molding method according to the composite lid of the present invention and an operating procedure thereof.

FIG. 8 is a cross-sectional view showing a main part of a compression molding apparatus for carrying out the compression molding method according to the composite lid of the present invention and an operating procedure thereof.

FIG. 9 is a part of a vertical cross-sectional view of a molding lid obtained by a compression molding method for a composite lid according to the present invention.

FIG. 10 is a cross-sectional view showing a main part of a high-frequency induction heating apparatus for performing high-frequency induction heating bonding according to the composite lid of the present invention and its operating procedure.

FIG. 11 is a sectional view showing a main part of a high-frequency induction heating apparatus for performing high-frequency induction heating bonding according to the composite lid of the present invention and an operating procedure thereof.

[Explanation of symbols]

A Composite lid 1 Metal inner lid 2 Inner lid top plate part 3 Inner lid skirt part 4 Inner lid central opening 5 Adhesive paint layer containing cohesive destruction adhesive on the outer surface of the inner lid 6 Masking ink layer 7 Adhesiveness on the inner surface of the inner lid Paint layer 10 Plastic outer lid 11 Plastic outer lid top plate portion 12 Outer lid skirt portion 13 Jaw portion of outer lid that covers the edge of the inner lid opening 14 Engagement portion between inner lid and outer lid 15 Inner lid skirt portion and outer lid skirt Gap between parts 20 Compression molding station 21 High frequency bonding station 22 Mold for compression molding 23 Compression molding turret 24 Inlet turret 25 Metal inner lid feeder 26 Inlet chute 27 Extruder 28 Die head 29 Rotary cutter 30 Male 31 Female type 32 Opening / closing member 33 Gripping portion 34 Outer gripping portion 35 Inner gripping portion 3 Outer flat surface portion of the opening / closing member convex portion 37 Inner curved surface portion of the opening / closing member convex portion 38 Heating / cooling mechanism 40 Female movable outer member 41 Circular through hole 42 Female movable inner member 43 Outer member lower outer inner circumference Surface 44 Convex peripheral surface of opening / closing member 45 Lower inner inner peripheral surface of outer member 46 Lower end of lower inner inner peripheral surface of outer member 47 Lower end surface of inner member 48 Heating / cooling mechanism 50 Synthetic resin material supplied in a molten state 51 Transfer turret 52 High frequency heating head 53 High frequency adhesive turret 54 Lid support 55 Block for pressing 56 Block pressing surface 57 High frequency coil 58 Ferrite 59 Refrigerant passage 60 Lid support tip 61 Knockout ring 62 Exit turret 63 Exit chute 64 Product hopper 65 Refrigerant passage

Claims (5)

[Claims] 1. A metal inner lid having a top plate portion, a fixing skirt portion around the top plate portion, and an opening at the center of the top plate portion; an inner lid, a large diameter top plate portion covering an upper surface of the top plate portion, and an inner lid. A plastic outer lid having a short skirt portion located on the outer periphery of the upper portion of the skirt portion; and an adhesive coating layer which is interposed between the outer surface of the metal inner lid and the inner surface of the plastic outer lid so as to releasably adhere the both. In the metal-plastic composite lid, a drying oil or a drying oil fatty acid is provided on the inner surface side or the outer surface side of the adhesive coating layer for controlling the adhesive force between the adhesive coating layer and the plastic to be non-adhesive or weakly adhesive. Adhesion control agent layer consisting of a resin obtained by curing the above or a resin modified with a drying oil or a drying oil fatty acid is present, and the non-coated portion is continuous in the circumferential direction but partially distributed in the radial direction. It is provided so that And a metal-plastic composite lid. 2. The metal-plastic composite lid according to claim 1, wherein the plastic outer lid is made of an olefin resin, and the adhesive coating layer contains a cohesive failure adhesive and a modified olefin resin. 3. The metal-plastic composite lid according to claim 2, wherein the adhesive paint contains a cohesive failure adhesive and a modified olefin resin in a weight ratio of 1: 2 to 1: 300. 4. The metal-plastic composite lid according to claim 1, wherein a space is provided between the metal inner lid skirt portion and the plastic outer lid short skirt portion located on the outer periphery of the upper portion thereof. 5. The plastic lid is made of an olefin resin, a modified olefin resin-containing adhesive coating layer is provided on the inner surface of the metal inner lid, and the plastic outer lid extends beyond the inner lid opening edge and the inner lid opening inner surface is formed. The metal-plastic composite lid according to claim 1, further comprising an engaging portion that is adhered to the.