KR950000587B1 - Packaging struture and process for production thereof - Google Patents

Abstract

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Description

Package and its manufacturing method

Figure 1a is a schematic diagram showing an example of the composite paper manufacturing apparatus according to the present invention,

FIG. 1B is an enlarged cross-sectional view of the composite paper produced by the apparatus shown in FIG. 1A,

2 is a sectional view of an essential part of a package provided by the present invention.

* Explanation of symbols for main parts of the drawings

1: middle layer 2: die

3 and 3 ': propylene polymer film 4: compression roll

5: first roll 6: second roll

7: 3rd roll 8 and 12: composite sheet

8 (1) and 8 (1 '): outer layer 8 (2): intermediate layer

10: aluminum foil 11: adhesive material

13: depression

The present invention relates to a package having excellent moisture resistance and transparency, which allows for excellent carrying out of a packaged material and a method for producing the same.

The present invention also relates to a method for producing a composite paper which can be appropriately molded into a package by pressure reduction molding and / or pressure molding.

Pharmaceuticals (tablets, capsules, etc.), cosmetics, and foodstuffs must be fully packaged because insufficient packaging can easily degrade or decay. And it is convenient to see from the outside after packing.

In order to satisfy the above requirements, a single sheet of polyvinyl chloride (PVC) or polypropylene (PP), or a composite sheet consisting of bonding a PVC layer by dry lamination to both sides of polyethylene (PE) and polyethylene sheets The packaging obtained by filling the article in accordance with reduced pressure and / or pressure molding has been used.

Packages molded from a single layer sheet of PVC or PP had low moisture resistance, so that the package was put back in an aluminum bag to deal with the defects. However, the moisture resistance of the package after opening the aluminum bag is a problem, and putting the package into the aluminum bag complicates the manufacturing process and adds production costs.

Packages formed using composite sheets composed of PE and PVC have very satisfactory moisture resistance for practical use, but it is not easy to take the contents out of the package at all. Some recently developed new drugs require higher moisture resistance than before, and it is desired to improve the moisture resistance of a package composed of the above-described composite sheet for the packaging of such drugs.

The present invention relates to a package having improved moisture resistance than a conventional package and an efficient method for producing the same.

The present invention also relates to an efficient method for producing a composite sheet suitable for the aforementioned package.

In the present invention, there is provided a package composed of a composite synthetic resin sheet having a recess for supporting a material and bonded to a metal foil sheet, wherein the composite sheet is composed of a high-density polyethylene intermediate layer and an propylene polymer outer layer bonded to both sides of the intermediate layer. It is a three-layer sheet, the middle layer has a thickness of 120 to 800 mu m, the outer layers each have a thickness of 15 to 80 mu m, and the middle layer thickness is at least 2.5 times the total thickness of both outer layers.

According to the present invention, there is provided a method for producing a package composed of a composite synthetic resin sheet having a recess for supporting a material and bonded to a sheet of metal foil, wherein the composite sheet has a propylene polymer external bonded to both sides of a high density polyethylene intermediate layer and an intermediate layer. It is a three-layer sheet of layers, the intermediate layer having a thickness of 120 to 800 μm, each of the outer layers having a thickness of 15 to 80 μm, and the intermediate layer thickness being at least 2.5 times the total thickness of both outer layers.

The manufacturing method is characterized by the following.

The depressions are formed on the composite sheet by pressure forming and / or pressure forming, and a metal foil is added to the composite sheet to be sealed after stuff is filled in the depressions, and heated from the metal foil side to form a composite paper of the metal foil and the open side of the space. The outer layer is joined in an integral structure to seal the space.

In the present invention, there is also provided a method for producing a composite sheet, wherein the composite sheet is a melt-bonded film of a high density polyethylene having a thickness of 120 to 800 µm and a melt-bonded film of a propylene polymer having a thickness of 15 to 80 µm, respectively. Possible to have an outer layer on both sides of the intermediate layer, the thickness of the intermediate layer is at least 2.5 times the total thickness of the outer layer.

FIG. 1A is a schematic view showing an example of a composite paper manufacturing apparatus according to the present invention, FIG. 1B is an enlarged cross-sectional view of a composite paper produced by the apparatus shown in FIG. 1A, and FIG. 2 is a package provided by the present invention. The cross section of the main part.

The package provided by the present invention is obtained by bonding a special composite synthetic resin sheet having a depression capable of receiving an object to a metal foil.

Recesses for receiving objects are known in the art as pockets and are molded into composite synthetic resin sheets by pressure and / or pressure molding.

The composite synthetic resin sheet used is a three-layered sheet having a high density polyethylene interlayer as a main component and having an outer layer of propylene polymer bonded to both sides of the interlayer. The thickness of each of the outer layers is 15 to 80 μm. The thickness of the intermediate layer is 120 to 800 µm and at least 2.5 times the total thickness of the outer layer.

The high density polyethylene constituting the intermediate layer has a melt flow rate MFR ₂ (190 ° C.) of 2 to 20 and a density of 0.94 to 0.98, preferably 0.965 to 0.98.

High density polypropylenes of the above properties are preferred in order to improve the strength, clarity and moisture resistance of the package and to obtain a rigidity suitable for easy lifting of the contents. Especially preferably, the melt flow rate ratio MFR ₁₀ (190 ° C.) / MFR ₂ of the high density polyethylene is 1 to 10.

The propylene polymer constituting the outer layer is preferably composed of 60 to 97% by weight of polypropylene and 40 to 3% by weight of ethylene polymer (total 100% by weight) in view of adhesion, transparency and strength between the intermediate layer and the metal foil. . The polypropylene used in the present invention is a polymer containing at least 90 mol% propylene units, which preferably has a melt flow rate of 0.5 to 20.

The ethylene polymer also has the effect of improving adhesion to the middle layer of the outer layer. Ethylene polymers used in the present invention define ethylene homopolymers or copolymers of less than 50 to 100 mole% ethylene with at least one other copolymerizable monomer, in particular alpha-olefins. As such, ethylene polymers are, for example, ethylene / propylene copolymers and ethylene / butene copolymers as low crystalline or amorphous (rubber phase) polymers, high density polyethylene, medium density polyethylene, low density polyethylene, and ethylene and other alpha-olepins And crystalline copolymers with.

Preferred examples of the ethylene copolymer are as follows.

(Iii) Low crystalline or amorphous copolymers (rubber) of ethylene and propylene having an ethylene unit content of 50 to 90 mol% and an MFR ₂ (230 ° C.) of 0.1 to 20 g / 10 min.

(Ii) Low crystalline or amorphous copolymers (rubber) of ethylene and propylene having an ethylene unit content of 50 to 90 mol% and an MFR ₂ (230 ° C.) of 0.1 to 20 g / 10 min.

(Iii) A crystalline polyethylene having an MFR ₂ (190 ° C.) of 2 to 20 g / 10 min and a density of 0.900 to 0.975 g / cm 3.

(Iii) A high density, medium density or low density crystalline copolymer with ethylene and at least one other alpha-olefin, having an MFR ₂ (190 ° C.) of 2 to 20 g / 10 min and a density of 0.900 to 0.975 g / cm 3.

Comonomer: Alpha-olefin, comonomer content: 3 to 20 carbon atoms, such as propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene 20 mol%, (iii) to (iii) polymers or copolymers may be partially or wholly modified with unsaturated carboxylic acids or anhydrides thereof. Preferred unsaturated carboxylic acids and their anhydrides are maleic acid, norbornenedicarboxylic acid, acrylic acid, methacrylic acid, maleic acid, anhydride and norbornenedicarboxylic acid anhydride.

The proportion of polypropylene in the outer layer to the ethylene polymer is preferably within the range specified above to ensure the adhesion between the intermediate and outer layers.

Due to the above preferred polymer ratio of the outer layer, the adhesive strength between the intermediate layer and the outer layer of the composite sheet used in the present invention is preferably at least 300 g / cm, more preferably at least 500 g / cm.

The thickness of the composite sheet is usually 150 to 960 mu m. The intermediate layer has a thickness of 120 to 800 mu m. Each of the outer layers has a thickness of 15 to 80 μm. The thickness of the intermediate layer is at least 2.5 times the total thickness of the outer layer.

The intermediate layer should have a sufficient thickness as the base layer of the composite sheet. The outer layer is provided to compensate for the low vacuum and pressure secondary molding aptitude and stretchability of the high density polyethylene constituting the intermediate layer. If the thickness specifically specified for the sheet layer is out of the above range, sufficient results regarding moisture resistance and ease of removal of contents cannot be obtained.

The composite sheet of the above structure can be produced by various methods, for example, by laminating with an adhesive such as a urethane adhesive at the interface between the preformed outer layer and the preformed intermediate layer.

Preferably, the composite sheet constituting the package of the present invention can be efficiently produced by an "extrusion simultaneous both surface bonding method", in which the intermediate layer is interposed between two preformed outer layers. Melt-extrusion, while simultaneously compressing the entire structure into rolls on both sides. By the above method, a uniform composite sheet can be efficiently produced.

An example of an extrusion-double sided simultaneous bonding method is shown in FIG. 1A. The high density polyethylene as interlayer 1 flows from the die 2 to a point near the compression contact point between the first roll 5 and the compression roll 4 in the molten state, preferably to the compression-contact point. The propylene polymer films 3 and 3 'as the outer layer adhere to both sides of the polyethylene at the compression-contact point and are stretched via the second roll 6 and the third roll 7 to form a composite sheet 8. FIG. 1 (2) is a cross sectional view of the resulting composite sheet 8, taken along line A-A in FIG. 1 (1). The composite sheet consists of an outer layer of propylene polymer films 8 (1) and 8 (1 ') and an intermediate layer of polyethylene sheet 8 (2).

The melt-bonding of the outer propylene polymer film and the intermediate polyethylene sheet uses the melting temperature of the polyethylene (about 170 ° C.) immediately after extrusion. In essence, polypropylene and polyethylene are difficult to melt bond with each other. However, since the propylene polymers constituting the outer layer have the composition specified above, they adhere well to each other to produce a composite sheet having excellent transparency.

The package of the present invention can be obtained by, for example, forming the depression by pressure forming and / or reducing the pressure of the three-layer composite sheet, and bonding the metal foil to the composite sheet to seal the depression to produce an integral structure. .

The metal foil may be a thin film of various metals such as aluminum, and usually has a thickness of 10 to 100 µm, preferably 15 to 60 µm.

When the package is used for PTP (Press through packaging) use, aluminum foil is preferred as the metal foil, because it can be destroyed by pressing with an appropriate force. At least the metal foil side surfaces bonded to the composite sheet are preferably coated with an adhesion promoting material such as an adhesive polyolefin. Examples of adhesive polyolefins are halogenated polyolefins obtained by modifying polyolefins such as polypropylene with halogens such as chlorine.

Specifically, the long band of the composite sheet is continuously heated to the molding conditions and sucked under air pressure and / or reduced pressure in the mold. An object, for example, a capsule drug, is filled in the resulting depression, and a metal foil such as aluminum foil is bonded to the depression side of the composite sheet. Punching, execution, printing, etc. are performed on the resultant packaging. The propylene polymer used in the present invention is poor in pressure secondary moldability and reduced pressure secondary moldability, but its pressure secondary moldability and reduced pressure secondary moldability are oriented in bonding the propylene polymer film to the outer layer and forming a composite sheet. By improving. The moisture resistance and transparency of the package are also improved.

The above pressure molding and / or pressure reducing molding is usually carried out at 120 to 140 ° C, preferably 125 to 135 ° C. The degree of orientation of the composite sheet can be varied by the heating temperature during pressure forming and / or pressure forming.

Since pressure forming and / or pressure forming at low temperatures are possible in the present invention, the resulting package can further improve moisture resistance and transparency.

One example of the package of the present invention is shown in FIG. The aluminum foil 10 is coated with the material 11 which is adhesive to the polyolefin. The composite sheet 12 is bonded to the aluminum foil 10 after the depression 13 is formed by pressure forming and / or pressure forming. Composite sheet 12 has propylene polymer films 12 (1) and 12 (1 ') as an outer layer and has an intermediate layer of polyethylene sheet 12 (2). An article such as a medicament, cosmetic or food item is contained in the depression 13.

The package of the present invention is particularly suitable for PTP applications and is used for the packaging of tablets, capsules and other materials.

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.

EXAMPLES 1-8

In each run, a three-layer composite sheet of the composition shown in Table 1 is formed by the extrusion-simultaneous double-sided bonding method shown in FIG. 1A.

High density polyethylene (HDPE) used as the interlayer has a MFR ₂ (190 ° C.) of 5.5 g / 10 min, a density of 0.968 g / cc, a weight average molecular weight of 67,000 and an MFR ₁₀ / MFR ₂ ratio of 9.0.

The propylene polymer used for the outer layer has the polymer composition shown in Table 1 and the properties of the individual components are as follows:

PP: polypropylene with MFR ₂ (230 ° C.) of 6.0 g / 10 min and an ethylene content of 4 mol%.

EPR: Ethylene / propylene copolymer rubber with 80 mole% ethylene unit content and 2 g / 10 min MFR ₂ (230 ° C.).

LLDPE (1): Ethylene / 4-methyl-1-pentene copolymer having 97 mol% of ethylene unit content and 2.0 g / 10 min of MFR ₂ (190 ° C.).

LLDPE (2): Ethylene / 4-methyl-1-pentene copolymer having 97 mole% ethylene unit content and 2.0 g / 10 min MFR ₂ (190 ° C.).

LDPE: low density polyethylene having a weight average molecular weight of 112,000 at a density of 0.921 g / cc.

The depressions or pockets (each having a length of 20.6 mm, a width of 8.8 mm and a depth of 7.4 mm for supporting the second capsule for pharmaceuticals) are formed at low temperature (125 to 128 ° C.) and high temperature (130 to 130 ° C.) under reduced pressure and pressure molding on the composite sheet. 135 ° C.), and the composite sheet is bonded to aluminum foil to produce the integral package of the present invention.

The aluminum foil had a thickness of 20 μm and had a 6 μm thick polypropylene chloride coating on the surface bonded to the composite sheet.

The properties of the resulting package are measured and evaluated by the following method and the results are shown in Table 2.

DD (Intelligent drawdown property, mm)

Fasten the composite sheet specimen horizontally to clamps 500 mm apart. After 55 seconds, measure the center descent.

Moisture permeability (* 10 ^-6 g / 24hr / mmHg / pocket)

It is measured under condition B (ie, temperature: 40 ° C., relative humidity: 90%) according to JIS Z-0203. The size of one pocket is the depression for capsule # 2.

Transparency (% transmittance)

The transmittance of the bottom of the package pocket (depression) is measured by light of 555 탆 wavelength according to ASTM D 1003.

Ease of Content Removal

The bottom of the package pocket containing the pharmaceutical capsule is pressed down with pressure by finger from the side of the composite sheet, causing the capsule in the pocket to be pressed and destroying the aluminum foil. By this operation, the capsule is taken out of the pocket. Determine whether the stiffness and bending strength of the multiple sheets is appropriate to collapse the pocket into a finger.

(Circle), (triangle | delta), and a x symbol have the following meanings.

(Circle): Excellent, (triangle | delta): Excellent, x: Poor.

Example 9

The composite sheet which has a composition shown in Table 1 is manufactured by dry lamination.

Specifically, a polypropylene (denoted PP) film having a thickness of 30 μm is laminated on both sides of a preformed sheet of 450 μm thick HDPE with a polyurethane adhesive to form a composite sheet.

The composite sheet was molded under the same pressure and pressure reduction as in Example 1 to prepare a package. The characteristics of the package are measured, and the results are shown in Table 2.

Comparative Example 1

Example 9 is repeated using a polyvinylchloride (PVC) film as both outer layers. The results are shown in Table 2.

TABLE 1

TABLE 2

[Examples 10 to 14]

In each implementation, Example 1 is repeated, changing the thickness of the intermediate and outer layers as shown in Table 3. The resulting package was evaluated in the same manner as in Example 1, and the results are shown in Table 4.

TABLE 3

TABLE 4

Claims (16)

A package comprising a composite synthetic resin sheet having a recess for receiving an object, wherein the composite sheet is a metal foil bonded to the sheet, wherein the composite sheet is a three-layer sheet composed of an outer layer of propylene polymer bonded to both the middle layer of the high density polyethylene and the middle layer. Wherein the intermediate layer has a thickness of 120 to 800 μm, each outer layer has a thickness of 15 to 80 μm, and the thickness of the intermediate layer is at least 2.5 times the total thickness of both outer layers. The package according to claim 1, wherein the propylene polymer forming the outer layer is composed of 60 to 97% by weight of polypropylene and 40 to 3% by weight of ethylene polymer, with a total ratio of 100% by weight. 3. The polypropylene of claim 2 wherein the polypropylene is a polymer containing at least 90 mole percent propylene units and having a MFR ₂ (230 ° C.) of 0.5 to 20, wherein the ethylene polymer is a homopolymer of ethylene or at least one other alpha -A copolymer with an olefin, wherein each contains 50 to 100 mol% of ethylene units. The package according to claim 1, wherein the high density polyethylene forming the outer layer of the composite sheet has a MFR ₂ (190 DEG C) of 2 to 20 and a density of 0.94 to 0.98 g / cc. The package according to claim 4, wherein the high density polyethylene has a MFR ₁₀ (190 ° C) / MFR ₂ (190 ° C) ratio of 1 to 10. A method for producing a package including a composite synthetic resin sheet having a recess for receiving an object and metal foil bonded to a sheet, wherein the composite sheet is composed of an outer layer of propylene polymer bonded to both the middle layer of the high density polyethylene and the middle layer. Layer sheet, the intermediate layer has a thickness of 120 to 800 μm, each outer layer has a thickness of 15 to 80 μm, the thickness of the intermediate layer is at least 2.5 times the total thickness of both outer layers, and the pressure reducing and / or pressure forming To form a depression in the composite sheet, add the metal foil to the composite sheet so that the object is sealed with the metal foil after the object is filled, and heat from the metal foil side to form the integral layer of the metal foil and the composite outer layer on the open side of the space. The method of manufacturing a package, characterized in that for sealing the space by bonding. 7. A method for producing a package according to claim 6, wherein the propylene polymer forming the outer layer is composed of 60 to 97% by weight of polypropylene and 40 to 3% by weight of ethylene polymer, with a total ratio of 100% by weight. . 8. The method of claim 7, wherein the polypropylene is a polymer containing at least 90 mole percent propylene units and having an MFR ₂ (230 ° C.) of 0.5 to 20, wherein the ethylene polymer is a homopolymer of ethylene or at least one other alpha A copolymer with an olefin, each containing 50 to 100 mol% of ethylene units. The method for producing a package according to claim 6, wherein the high density polyethylene forming the outer layer of the composite sheet has a MFR ₂ (190 DEG C) of 2 to 20 and a density of 0.94 to 0.98 g / cc. 10. The method of claim 9, wherein the high density polyethylene has a MFR ₁₀ (190 ° C) / MFR ₂ (190 ° C) ratio of 1 to 10. The method of manufacturing a package according to claim 6, wherein an outer layer composed of a propylene polymer in a solid state is laminated on both surfaces of an intermediate layer of high density polyethylene in a melt-bondable state to form a composite sheet. A method for producing a composite sheet, characterized in that the film is fused at the same time as the outer layer on both sides of the 120 to 800㎛ thick high-density polyethylene melt-bonding intermediate layer as the outer layer, and the thickness of the intermediate layer is the outer layer At least 2.5 times the total thickness. 13. The method for producing a composite sheet according to claim 12, wherein the propylene polymer forming the outer layer is composed of 60 to 97% by weight of polypropylene and 40 to 3% by weight of ethylene polymer, with a total ratio of 100% by weight. . The method of claim 13 wherein the polypropylene is a polymer containing at least 90 mole percent propylene units and has a MFR ₂ (230 ° C.) of 0.5 to 20, wherein the ethylene polymer is a homopolymer of ethylene or at least one other alpha A copolymer with an olefin, each containing 50 to 100 mol% of ethylene units. The method for producing a composite sheet according to claim 12, wherein the high density polyethylene forming the outer layer of the composite sheet has a MFR ₂ (190 DEG C) of 2 to 20 and a density of 0.94 to 0.98 g / cc. The method of claim 15, wherein the high density polyethylene has a MFR ₁₀ (190 ° C) / MFR ₂ (190 ° C) ratio of 1 to 10.

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