JPH08129099A - Wrapping body for photograph article or radiograph article - Google Patents

Abstract

PURPOSE: To provide a photographic product packaging material to be re-cycled by laminating a heat sealed polymer component, a barrier layer containing vapor-deposited inorganic pigment and polyester base component in sequence from an inner surface to the outside. CONSTITUTION: A base body made of transparent polyethylene terephthalate is provided, which includes a 100Åvapor-deposited layer having a thickness of 12μm obtained by vapor-depositing silicon oxide in vacuum. The polyester coated with silicon oxide forms a part of the outer side of the packaging composite body. The polyester coated with silicon oxide is then stuck to straight chain low density polyethylene having a thickness of 180μm and colored black and a silica coated surface is adhered to a polyethylene component. For this adhering, one or two component polyurethane base adhesive agent containing or not containing solution is used as an adhesive.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to packages of photographic and radiographic products.

[0002]

BACKGROUND OF THE INVENTION Various composite materials (hereinafter referred to as "complexes") have been proposed for packaging photographic or radiographic products. One of these types of packaging is a composite made of polyethylene coated with a film of metallized polyester. In particular, such packaging allows vacuum packaging by heat sealing of radiographic products incorporating screens. The characteristics that a composite for packaging photographic or radiographic products must possess are impermeable (especially to light and moisture), suitability for heat sealing, strength (mechanical resistance to tearing) and, of course, this There is no interaction with the photographic or radiographic product that is packaged with the composite. The impermeability of metallized polyester based composites may be uncertain as a result of variations in the quality of the polyester and / or the metal coating on the polyester. In general, the above features represent numerous constraints on the selection and manufacture of packaging composites. Besides these, for quite some time now
There was another restraint arising from issues related to environmental protection.
Currently, packaging must be recyclable without undue difficulty. However, composites containing metallized polyesters as one component, due to the presence of metal,
This raises a question.

[0003]

Accordingly, recyclable packaging nevertheless has the characteristics required in other respects,
For example, it would be desirable to have access to photographic and radiographic products without sacrificing impermeability, strength or dimensional stability.

[0004]

The object of the present invention is, from the inside, (a) a polymer component suitable for heat sealing, (b)
By proposing a recyclable composite that can be used in the packaging of photographic or radiographic products, comprising a barrier layer comprising an inorganic pigment obtained by vapor deposition and (c) a polyester base component in sequence. To solve the problem.

The term "inner surface" means the surface of the packaging that contacts the photographic film after folding and heat sealing.

An intermediate layer containing an adhesive can be placed between the polyester component and the heat-sealable component.

At least one of these components is opaque so as to prevent actinic radiation from acting on the photographic product. According to one embodiment, the intermediate adhesive layer between the heat sealable component and the polyester component comprises an adhesive.
According to another embodiment, opaque materials such as carbon black, titanium oxide or zinc oxide, barium sulphate, or organic pigments such as aniline black or polyazo dyes are incorporated into the heat-sealable polymer component. Furthermore, if desired, antistatic properties can be improved by using conductive carbon black.

The heat-sealable component comprises a polymer having a suitable melting temperature to enable heat-sealing. To this end, α-olefin polymers or copolymers are used, in particular linear copolymers of ethylene and higher α-olefins having, for example, 3 to about 10 carbon atoms. The α-olefin polymer or copolymer is oriented (orien).
t) can. The layer of alpha-olefin polymer or copolymer may itself consist of two or more laminated sheets, each of which has been stretched in different directions by stretching. Each sheet can be separated from an adjacent sheet by an intermediate layer that includes an adhesive. The total thickness of the heat-sealable components is generally about 20 to about 300 μm, preferably 100 to 200 μm.
m. Such a complex is sold, for example, by VAN LEER under the name VALERON®.

The barrier layer (b) containing the inorganic pigment is about 0.0
1 to about 1.0 .mu.m, advantageously obtained by vapor deposition or spraying under vacuum as deposition layer having a thickness of 0.04~0.10μm is obtained in the silicon oxide SiO _X (wherein, x Is 0 to 2). The total thickness of the polyester-based component (c) is about 5 to about 50 μm, preferably 10 to 25 μm. The assembly of different layers or components of the composite is carried out by a conventional method such as heat sealing, coextrusion, ultrasonic welding, use of a hot-melt adhesive composition and the like. The packaging of photographic or radiographic products according to the invention is also carried out in the usual way according to the method of heat sealing, welding or induction welding and / or the use of hot melt adhesives.

[0010]

The composites of the invention are particularly suitable for packaging photographic products under vacuum or radiographic products incorporating screens, especially those exposed to an X-ray source through individual packages. This composite consisting only of organic polymers containing small amounts of silicon oxide is also easily recyclable.

[0011]

EXAMPLE A packaging composite is prepared using the following ingredients: 12 μm thick, 4P VERPACKUNGEN GmbH (Ronsbe
ESTAR® transparent polyethylene terephthalate substrate with 1000Å deposited layer obtained by depositing SICOMPLEX® type silicon oxide under vacuum sold by RG, Germany). This polyester coated with silicon oxide forms the outer part of the packaging composite. The silicon oxide coated polyester is then bonded with VALERON® linear low density polyethylene with a colored black with a thickness of 180 μm sold by VAN LEER (Essen, Belgium), silica The coated surface is adhered to the polyethylene component.
To perform this bonding, a one- or two-component polyurethane-based adhesive with or without solvent (Multiflex® sold by CECA) is used as the adhesive. The VALERON® component consists of four orthogonal layers of low density polyethylene, each separated by a coating of adhesive. This component constitutes the inner part of the packaging composite.

A similar control packaging composite is prepared except that instead of the polyester having a silicon oxide vapor deposited layer on the polyester, a polyester having an aluminum vapor deposited layer obtained by vacuum vapor deposition is used.

The two packaging composites are then subjected to a series of tests to evaluate their properties in terms of impermeability to light, moisture and air, peel resistance and tear strength. The tests used are defined or explained below. The results obtained are shown in Table 1 below.

Table 1 Adhesion of daN / 15 mm VALERON® composite to metallized polyester silica coated ter (control) polyester unit polyester Longitudinal (direction of rotation) 0.270-0.330 0.627 (1) Horizontal 0.220-0.410 0.610 ( 1) Elmendorf tear strength; ASTM D-1922 vertical cN 1240 to 2480 1972 horizontal 1510 to 2360 1453 tear strength daN TSA-108 DIN 53363 vertical 12 11.2 horizontal 9.7 11.1 first tear strength mm ASTM D-2582 vertical 30.2 35 horizontal 33.1 38 Fracture strength N / m 8.4 5.4 AFNOR Q-03-034 Moisture permeability g / m ² / 24h 0.3-0.8 0.84 38 ° -50% RH (AFNOR H-00-44) Welding resistance daN / 15mm 15.6 ~ 21.6 20 150 ℃ -0.5s-2000hPa

The tests used are as follows: Adhesion: 100 × 15 mm test pieces are cut in each direction (longitudinal and lateral). For all test pieces, at one end,
Release of the heat-sealable component from the polyester component is initiated over a length of 20 mm. The free end of the test piece
Fix it in the jaw of the dynamometer. The force required to peel the two components is measured over a range of 0 to 2 daN at a force gauge jaw peel rate of 100 mm / min. The resistance must be above 0.225 daN / 15mm. Permeability: Test on folded samples (AFNO
R H00-044); permeability must be less than 1.0g / m ^2/24 hours.

[0016]

The results in Table 1 show that, especially for composites comprising polyester coated with silicon oxide, excellent adhesion between polyester and polyethylene (1) is obtained while at the same time photographic products And that all other properties necessary for using the composite in the packaging of radiographic products are retained. Furthermore, when the composite containing the polyester coated with silicon oxide is used for the packaging of standard medical X-ray products, the transparency to light is 0; the fog level remains below 0.15 and the photographic sensitivity is reduced. 15% fluctuation
It is shown to stay below. Thus, according to the present invention, a composite is produced which meets the requirements for packaging photographic or radiographic products while at the same time being easy to recycle.

Claims (4)

[Claims] 1. A sheet comprising (a) a component containing a heat-sealable α-olefin polymer or copolymer, (b) a barrier layer and (c) a polyester sheet, from the inner surface in contact with the photographic or radiographic product, said sheet comprising: Component (a),
A package for a photographic or radiographic product, wherein at least one of (b) or (c) is opaque, wherein the barrier layer (b) comprises an inorganic pigment obtained by vapor deposition. 2. A package for a photographic product or a radiographic product according to claim 1, wherein the inorganic pigment is silicon oxide SiO _x [wherein x is 0 to 2]. 3. The component (a) comprising an α-olefin polymer or copolymer comprises at least two separate layers or sheets oriented in different directions and separated by an adhesive layer. A package for the described photographic or radiation product. 4. A package for a photographic or radiation product according to claim 2, wherein the component (a) comprises a black pigment.