DE2348931A1 - METHOD OF MANUFACTURING A BODY FOR MOISTURE-PERMEABLE PACKAGING - Google Patents

Description

u.z. : K 491 (D / Rf) FP-OO34

DAI NIPPON PRINTING CO., LTD.
Tokyo, Japan

"Method of making a body for moisture-impermeable Packagings "

"^ Priority: September 29, 1972, Japan, No. 97 813/72

^ August 7, 1973, Japan, No. 88 030/73

The invention relates to a method zur.Herstellung of a body for moisture-impermeable packaging, the two or has more indentations to accommodate the contents of the package.

Recently, the requirements for highly moisture-impermeable packaging for medical tablets, foodstuffs , delicate machine parts and other moisture-sensitive goods have increased.

The production of moisture-proof bodies with only an indentation is practically not carried out, apart from exceptional cases, but bodies are for packaging with two or more, in particular many indentations for receiving the contents of the packaging, are generally widespread.

4098U / 0522

ORfGlNAL INSPSCTED

In the known processes for the production of moisture impermeability • casual body is generally a thermoplastic film, which is already impermeable to moisture in itself, e.g. a polyvinylidene chloride film, or a moisture-impermeable film equipped thermoplastic film, e.g. a polyvinyl chloride film coated with polyvinylidene chloride or Film is covered, heated to softening, whereupon the softened Foil by means of pressure or vacuum application to form a moisture-impermeable body with one or more indentations is deformed to accommodate the contents of the package.

These known methods are stretching deformations, and these methods are therefore well applicable to those materials which, when heated and softened, are considered thermoplastic Films can be stretched 100 to 200 percent or more.

However, so far it has not been possible to make the moisture impermeable Body with two or more indentations to accommodate * the contents of the package using a composite film manufacture, which is made in a conventional manner by gluing a thermoplastic film and a metal foil has been because the metal foil tears in the course of the stretch forming.

The reason why this body cannot be produced by conventional deformation methods is that the elasticity of the material to be deformed must be 100 * $> or more, but the maximum elongation of the metal foil

400SU7D522

234893I _n

only about 20 to 30 percent "even if the deformation is made in the warmth. Accordingly, the metal foil is at destroyed by the deformation.

The object of the invention was therefore to provide a method for producing a moisture-impermeable body with two or more To create indentations using a composite film, which by gluing a thermoplastic film with a metal film has been produced without destroying the metal foil.

Another object of the invention is to do with the foregoing Method to avoid the occurrence of folds in the area of curvature of the indentations for accommodating the contents of the package. These objects are achieved by the invention solved. .

The invention thus relates to a method for producing a body for moisture-impermeable packaging, the has two or more indentations for receiving the contents of the package, which is characterized in that one thermoplastic film a metal film by means of an ohmic adhesive glues on, only the metal foil of the Yerbund foil obtained in this way, forming two or more recess areas, the Correspond in size to the contents of the package, incise and cut the recess areas of the composite film using a Form tool from two or more punches and a corresponding die at a temperature that the hot melt adhesive and the thermoplastic film is able to soften, stretch-deformed.

4098U / Q522

■ - 4 -

In the method of the invention, the peripheral edges of the recess areas of the metal foil can be stretch-deformed with progressive deformation towards the center of the dies, since the hot-melt adhesive is softened and the softened adhesive serves as a lubricant, and the peripheral edges of the recess areas have already been cut. Therefore, the recess areas can be stretch-deformed without destroying the metal foil.

Examples of thermoplastic films which can be used according to the invention are films made of polyvinyl chloride, polyethylene, polypropylene, polyesters or polycarbonates. Vortugeweise be as thermoplastic films of polyvinyl chloride sheets used · The thickness of the thermoplastic films is generally from 100 to 50Ou, preferably from 150 μ to 300 and especially 150 to 200 u.

Examples of metal foils which can be used according to the invention are . Foils made of aluminum, tin, copper or iron. Aluminum foils are preferred. The metal foils preferably have a Thickness from 30 to 15OM »especially 4-0 to? 0 11.

Preferably hot melt adhesives based on ethylene-vinyl acetate copolymers are used for the method of the invention, Polyvinyl acetate, polyvinyl butyral, polyethylene or polyamides are used, these polymers as the main component, e.g. with Colophony, Estergumaei or paraffin mixed as additives are. The thickness of the hot melt adhesive is preferably 3 to 30 11, especially 10 to 15 M

4098-U / 0S22

2340931-1

Although the stretching deformation of the composite film containing the thermoplastic film and the metal foil without tearing the Metal foil can often be made tine wrinkling and / or shrinkage in the band or »KrüDwanga area dee * uchtie-JasÖB impermeable Body observed

The occurrence of this "wrinkling or wrinkling" can occur be prevented by removing the metal layer of the composite film reinforced by gluing another thermoplastic layer on the metal foil. This allows for the stretching deformation the compressive force of the holding jaws or the sheet metal holder be increased, so that the stretching deformation of the composite film without the occurrence of wrinkles or shrinkages is possible.

A preferred embodiment of the method of the invention therefore consists in "that by gluing the metal foil and the thermoplastic film with. a hot melt adhesive, and cutting the metal foil to form recess surfaces obtained composite film glued on dev metal side with a further thermoplastic film and the composite film thus obtained fiinfechichtige * subjecting eekver ~ modeling in the aforementioned manner of St.

The adhesive used to bond the thermoplastic film to the Metailfo- 'lie is preferably "VyIon 50" (manufacturer. Foyo Spinning Co., Ltd.), the main component of which consists of a composite. saturated polyester resin, or an adhesive made from saturated polyester / isocyanate. The thickness of this adhesive is preferably 3 to 20 µm, in particular 5 to 10 µm.

409814/0522

Due to the fact that the metal foil ^{1 has} already been cut, the gluing of the lowest thermoplastic foil kit of the metal foil is carried out using a hot melt adhesive *. According to the invention, the metal foil can then be stretch-deformed without tearing, * for the gluing of the thermoplastic foil. Surface of the metal foil

a hot melt adhesive or a normal adhesive can be twisted. X * If a cutting adhesive is used, both the hot-melt adhesive on the surface and the hot-melt adhesive on the reverse side of the metal foil are softened at the time of the stretching deformation. Thus, the hot melt adhesive on the back of the metal foil serves as a lubricant. The force applied when pressing the jaws or sheet metal holders together can be increased due to the presence of the thermoplastic film on the surface of the metal foil, and the occurrence of wrinkles or shrinkage in the band or curve area can be avoided. In the case of using the above-mentioned "Vylon 300" or ναι adhesive on the ¹ based on saturated polyesters and isocyanates, the metal foil and the thermoplastieche sheet during the deformation at the same time towards the center of the Mttrise deformed towards · Me metal foil can thus by the presence of the thermoplastic film can be enhanced at the time άατ deformation. In addition, due to the fact that the force applied when pressing the jaws or sheet metal holders together can be increased, there is no wrinkling or shrinkage in the edge or crinkle area of the indentations. Manufacture according to the invention of moisture-impermeable bodies with two indentations for receiving the packaging halts is described below with reference to the drawings.

4Ö9S14 / 0521

_Γ 7-

Seigern

Fig. 1 is a plan view of an embodiment of a composite film that can be used for the method of the invention,

FIG. 2 shows a section along the line I-1 of FIG. 1, FIG. 3 shows a plan view of a moisture- impermeable body with two indentations for accommodating the package contents β, which is obtained after the deformation of the composite film shown in FIGS. 1 and 2 , Fig. 4 shows a section along the line H-II of Fig. 3, Fig. 5 shows a cross section of a stretch forming machine, the two main punch and the corresponding die * and the state of the composite film, as viewed from

Fig. 1 and 2 results before the stretch forming, Fig. 6 shows a cross section of a stretch forming machine, the

mainly shows two punches and the corresponding die as well as the state of the composite film after stretching,
Figure 7 is a cross section of another embodiment of a

Composite film that can be used according to the invention, Fig. Β is a plan view of a further embodiment of a

Composite film that can be used according to the invention, FIG. 9 shows a section along the line IH-III of FIG. 8, 10 is a plan view of a moisture-impermeable body with two indentations for receiving the contents of the package, which has been obtained after the deformation of the composite film of FIG. 45,

; 11 shows a cross section along the line IV-IV of FIG. 10,

- ■ "■ .-. ■ - ■■ -

. Fig.12 is a cross section of another embodiment of a

409814/0522

Composite film that can be used in accordance with the invention and

13 is a cross section of a package made using the moisture-impermeable body of the present invention with two indentations and which contains the contents of the package.

In Fig. 1, A represents a composite film in the state before stretching, a thermoplastic film 1 is glued to a metal film 3 by means of a hot melt adhesive 2 and two recess areas A ¹ and A ″ are made by cutting only the metal foil 3, as shown by the Line B in Fig. 2 is indicated.

In Figs. 3 and 4, A represents the moisture impermeable Body for the packaging, which has been obtained by stretching according to FIGS. The body exists from a thermoplastic film Ί, a hot melt adhesive 2, a metal foil 3 »the edge areas 4, indentations for Recording of the package contents 5 as well as gaps 6, which are caused by the wandering of the peripheral edges of the two recess areas A ' and A ″ (see FIG. 1) of the metal foil 3 at the time of the stretching deformation have arisen. B means the cutting line of the metal foil 3

The following is the process of stretch deformation from the composite films shown in FIGS. 1 and 2 to those in FIG. 3 and 4 shown moisture-impermeable bodies with two indentations for receiving the package contents based on the,

A098U / 0S22

Fig. 5 and 6 described mainly the stamp and the Show the die of the stretch forming machine.

In FIGS. 5 and 6, A represents a composite film. A jaw or a sheet metal holder 7 serves to prevent wrinkling or shrinkage. The stretch-forming machine contains a die 8 with a cooling device 10, a punch 9 _? a heating device 11, which is provided in the jaw 7 and a plate 12 as a support for the punch 9. The jaw 7 has a flat recess C in the lower part to facilitate the stretching deformation.

In the practical implementation of the method, the composite film A is placed on the die 8, which is cooled by means of the cooling device 10. The recess areas A 'and A " of the composite film are arranged so that they are under the punches 9 and 9. The composite film is between the Die 8 and the jaw 7, which is heated by means of the heating device 11, are arranged. This will prevent the appearance of wrinkles or. Shrinkage in the edge or curvature area avoided. In In this case, a temperature is used for the deformation at which the hot-melt adhesive 2 and the thermoplastic film soften will.

As can be seen from Fig. 6, the with the plate 12 are connected

ujt)

which punches 9 and 9 are then lowered, the recess areas A ¹ and A ″ of the composite film A being stretched. Then the punches 9 and 9 are raised again, and the

εΐο; ο body with two indentations for j 4098U / 0 5 22

The contents of the package are recorded after the Hot melt adhesive 2 has solidified.

According to the invention, the composite film according to FIG. 7 can instead the composite film described above can be used.

In Pig. 7, the composite film consists of thermoplastic films 1 and V, the hot melt adhesive 2, a metal foil 3 and an ordinary one Glue 1J. The cutting line «for making the recess areas is denoted by B. In the case of the composite foil, there is an advantage that the metal foil 3 during and / or. after the stretch deformation can be reinforced because the thermoplastic Foil 4 is glued to metal foil 3.

In addition, the method of the invention can also be used with the 8 and 9 apparent composite film can be carried out.

Fig. 8 shows the composite film A in the state before stretch forming, which is obtained by the following method: A thermoplastic film 1 is bonded to a metal film 3 using a hot melt adhesive, and only the metal film is formed with the recess areas A ^f and A "in of the metal foil, as shown by a broken line B and also a solid line B, and the

thermoplastic film 15 is with the surface of the metal foil 3 glued with an adhesive 14.

Figs. 10 and 11, A represents a moisture-impermeable Qj

409814/0522

üorper for packaging purposes, which is obtained by stretching the composite film of FIGS. 8 and 9. In FIGS. 10 and 11, the body consists of a thermoplastic film 1, a hot-melt adhesive 2, a metal foil 3, a hot-melt adhesive or ordinary adhesive 14, a thermoplastic film 15 _? a hand or curvature area 16, an EMxditung 17 for the

jjnd

would take the contents of the packaging from a gap 18, which was created by the migration of the peripheral edges of the two recess areas A ¹ and A ^H (see Fig. 8) of the metal foil-3 at the time of the stretching deformation - B means the cutting line of the metal foil 3-

Furthermore, the method of the invention can also be carried out using a composite film according to FIG. 12 instead of the aforementioned composite film shown in FIG.

In Fig. 12, the body ;; sr * consists of a thermoplastic film 1, a hot-melt adhesive 2, a metal foil 3 "an ordinary one Adhesive 19 * a thermoplastic film 20, a hot melt adhesive or conventional adhesive 21 and a thermoplastic Like 22. B represents the cutting line of the metal foil to form the recess areas.

In order to produce a complete package using the body produced according to the invention, for example, a moisture-impermeable Foil in which a metal foil is coated with a heat-sealable adhesive, with the moisture-impermeable one Body glued for packaging purposes according to FIG. The packaging of Fig. 13 consists of a thermo

4098U / 0522

plastic film 1, a hot-melt adhesive 2, a metal foil 3 »a heat-sealable adhesive 23, an edge or curvature area 24, an indentation for receiving the package contents 25» a gap 26, which is created by the migration of the peripheral edges of the two recess areas of the _r Metal foil has arisen, a heat-sealable adhesive 27 of a metal foil and the content 29- »■ ■

Of course, the number of indentations is not limited in the method of the invention. Accordingly, according to the invention manufactured body a multitude of indentations, in particular 100. ' or more indentations to accommodate the ■ Package contents included.

As already mentioned, the body produced according to the invention is Moisture-impermeable, as the metal foil is not destroyed and there is no wrinkling or shrinkage in the edge or Cooling area of the indentations for receiving the contents of the package on eten. It can therefore be a completely moisture-proof packaging with one or more indentations for receiving the contents of the package thereby produced be that one glued a moisture-impermeable lid on the body or by two produced according to the invention Bodies glued together. According to the invention it is therefore possible to produce packaging that meets the strict requirements in terms of moisture impermeability for the packaging of medical tablets, food and sensitive machine parts.

'4098U / O522

The examples illustrate the invention. I. example 1

A hot-melt adhesive from Ithylen-vinyl acetate copolymer having a softening point of 60 to 70 ⁰ C in an amount of 15 g / ω to a hard polyvinyl chloride sheet having a thickness of 150 u applied; then the coated PVC tape is glued to a 60 micron thick, soft aluminum foil. The aluminum surface of the three-layer composite film is coated with a heat-sealable vinyl chloride-vinyl acetate lacquer. Then only the aluminum foil is cut in such a way that two circular recess areas with a diameter of 24 mm are created.

Using a die with a clear width of 12.6 mm and a punch with an outer diameter of 12.0 mm, the composite film obtained is placed between the die and the jaw, which, as shown in Figure 5, is heated by a heating device . While the temperature of the die is kept below 50 ⁰ O, the punch is pressed into the die, as shown in Pig As a result, the outer diameter of the recess areas of the soft aluminum foil is drawn to an outer diameter of 14 mm, and the hard PVC film is also stretch-deformed.

Example 2

Instead of the aluminum foil of Example 1, a soft one is used

A098U / 0522

■ ■. ■: ■ ■ · ■ · ■ · ι

Aluminum foil with a thickness of 5 ° μ is used and with the -,

• Using polyvinylchloride film, which is only 30% thick.

a polyester (saturated) / isocyanate adhesive instead of the heat-bendable one Lacquer from example 1 glued. Then the hard vinyl chloride film with a thickness of 150ju is applied to the Aluminum surface using the hot melt adhesive from

game 1 glued on. In the composite film obtained in this way, both the polyvinyl chloride film * with a thickness of 30u as also cut the soft aluminum foil with a thickness of 50- P, so that circular recess areas with a diameter of 24 mm arise. The recess areas of Composite films are stretch-molded according to Example 1. A result similar to that in Example 1 is obtained.

■ Example 3

A hot melt adhesive consisting of ethylene-vinyl acetate copolymer with a softening point of 60 to 70 ⁰ C is in a

An amount of 10 g / m 2 is applied to a rigid polyvinyl chloride film with a thickness of 1 ^ 0 ii · Then an aluminum film with a thickness of ? Q u is glued on. In the composite film obtained, only the aluminum film is cut, so that two circular recess areas with a diameter of 24 mm are obtained. Then the aluminum surface of the composite film, which consists of three layers, is covered with a. Coated polyester adhesive in an amount of 10 g / m, whereupon a rigid polyvinyl chloride film with a thickness of 30 u is glued to form a composite film consisting of five layers.

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a M & triBe with a clear width of 12 * 6 mm and, a stamp used with an outer diameter of 12 »0 mm. The hoe is heated to a temperature of 80 to 90 ° C *

Äüfreönternalteh is · At the time of deformation, the iDempera- Mfma cooling ·

tui * the Hätrizefauf eiiaee !! temperature kept below 50 -C.

will·
cooling

f ii !! tet t 50

Vferbundföiie is attached between the cheek and the hat. arranges. After 4 deformation, the thermoplastic iOlie and the Böhmelfe glue are softened, and two punches are pressed into the die 4 so that two indentations with a length of 5 mm are created on the two Ausöfarungsflächen of the composite film. As a result, the drawing reduces the outer diameter of the aluminum foil from 24 to 14 mm, and the ^rigid: polyvinyl chloride sheet is stretched. The aluminum foil

the body obtained is not torn and there will be none Wrinkle formation or shrinkage in the hand or unfap area of the observed both indentations.

Example 4

Example 3 is repeated using a hot-melt adhesive made of ethyl-n-vinyl acetate copolymer instead of the polyester adhesive. Results similar to Example 5 are obtained. * .- '

The moisture permeability of the body obtained in Examples 3 and 4 with two indentations for receiving the. , Packaging content is only about 1/5 of that of a commercially available Fdcpers gteicherÄcm n ± t ndedrigsiEr iteuditigkeliBdurchlässigk.ei1J _(i, The known body is produced so that a Pölyvinyl-

L_chlt> ridfolie with a thickness of 15Ο Ii with Polyvinylidenchloiid-j '' 409814/0522 ·:

Resin coated to a thickness of 25 U and glued with a polyvinyl chloride film coated in the same way.

409814/0522

Claims (1)

■ - 17. - Claims Method of making a body for moisture impermeable Packaging that has two or more indentations for receiving the contents of the packaging "d u r c h characterized in that a metal foil is glued onto a thermoplastic film by means of a hot melt adhesive, only the. Metal foil of the composite foil obtained in this way with formation two or more recess areas, which correspond to the size of the package contents, and the recess areas the composite film using a molding tool consisting of two or more punches and a corresponding The die is stretched at a temperature which is capable of softening the hot-melt adhesive and the thermoplastic film. 2. The method according to claim 1, characterized in that by gluing the * metal foil and the thermoplastic Foil obtained with a hot melt adhesive and cutting the metal foil with the formation of recess areas Bonded composite film on the metal side with another thermoplastic film and the five-layer film obtained in this way The composite film is subjected to the stretching deformation in the aforementioned manner. 5. The method according to claim 1 or 2, characterized in j that the thermoplastic film is a film made of polyvinyl chloride, Polyethylene, polypropylene, polyester or polycarbonate are used. 4098U / 0522 V. - 18 - ' 4-. Process according to claim 3, characterized in that thermoplastic films with a thickness of 100 to 500 u, preferably 150 to 300 u and in particular 150 to 200 u used. 5. The method according to claim 1 or 2, characterized in that a metal foil. Of aluminum, tin, copper or iron is used. _t 6. The method according to claim 5i, characterized in that one Metal foils with a thickness of 30 to 150 p> preferably 40 to 7OMi used. 7. The method according to claim 1 or 2, characterized in that a hot melt adhesive is used as the main component Ethylene-vinyl acetate copolymers, polyvinyl acetate, polyvinyl butyral, Contains polyethylene or polyamides and, as additives, colophony, ester gums or paraffin. 8. The method according to claim 7 *, characterized in that the hot melt adhesive is used in a thickness of 3 to 30 μ _t, preferably 10 to 15 U ». 9. The method according to claim 1, characterized in that the composite film obtained by gluing the metal film and the thermoplastic film with a hot melt adhesive is applied the metal side is glued to another thermoplastic film and the recess areas by cutting into the metal foil and the thermoplastic film on the metal surface j 40981.4 / 0522 manufactures. 10. The method according to claim 2, characterized in that the, optionally without cutting the metal foil, is obtained five-layer composite film on the surface of the thermoplastic film directly connected to the metal film Glued to another thermoplastic film using a hot melt adhesive or a conventional adhesive and the recess areas by cutting the metal foil and the thermoplastic directly connected to the metal foil Manufactures foil. ■. . A09'8U / 0522 Ιΰ Blank page