JP2004163409A - Packaged storage phosphor screen or panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a phosphor screen or panel which is perfectly protected at least against oxygen and moisture. <P>SOLUTION: At least one phosphor screen or panel packed in a sealed package is characterized in that the package is laminated in the form of an asymmetric barrier layer foil, the foil includes an inside soft thermoplastic polymer layer 5 and an outside polymer layer 1, the outside polymer layer 1 is glued to and is in contact with an aluminum layer 3 located between the inside soft thermoplastic polymer layer 5 and the outside layer 1 and the vapor of less than 0.01 g/m<SP>2</SP>permeates and oxygen, carbon dioxide and nitrogen of less than 0.01 cm<SP>3</SP>/24 hours and 1 m<SP>2</SP>/bar respectively permeate in the environment where the foil has the relative humidity of 75% RV and the temperature of 23°C for 24 hours owing to the adhesivity between the outside polymer layer 1 of 2.5 N/mm<SP>2</SP>or larger and the aluminum layer 3. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a packaged storage phosphor screen or panel, and a package for packaging the raw materials necessary to form said screen or panel, said package providing at least excellent protection against moisture and oxygen. About the use of

BACKGROUND OF THE INVENTION It is well known that very many of the raw materials (eg, phosphors) required to form a sensitized or storage phosphor plate are highly sensitive to moisture. That is, they are somewhat hygroscopic and tend to absorb water. Even the absorption of a small amount of water rapidly reduces the effectiveness of the phosphor to a value that is negligibly small.

  Most plates or panels coated with halide containing phosphors have this disadvantage. Hygroscopic phosphors used in intensifying screens are, for example, BaFCl: Eu, BaFBr: Eu, LaOBr: Tm and GdOBr: Tm. Examples of hygroscopic X-ray storage phosphors that can be used in a computer radiographic system are: BaFBr: Eu, BaFI: Eu, LaOBr, (Ba, Sr) F (Br, I): Eu, RuBr: Tl, CsBr: Eu, CsCl: Eu and RbBr: Eu. In order to make these hygroscopic phosphors suitable for use, it is necessary to protect the phosphor particles from moisture.

One way to protect the individual phosphor particles is to coat them with a material such as SiO ₂ or TiO ₂ that prevents moisture penetration. This is disclosed in EP-A 0097377, 0476206 and 0928826; GB-A 2255100; US-A 5,196,299 and 6177030 and WO 00/22065. In an alternative, the phosphor particles are coated with a UV absorbing transparent synthetic resin and are made resistant to moisture, oxidation and UV radiation. This is disclosed in JP-A 60-077090.

  However, it is very difficult to apply a defect-free coating to particles having an average particle size of 1 to 10 μm. Furthermore, if the coating on the phosphor particles is too thin, the amount of phosphor in the layer should be reduced to avoid increasing the thickness of the coated phosphor layer. Since this results in reduced X-ray absorption by the phosphor screen or panel, no acceptable solution can be expected from that means. Therefore, applying a coating around individual phosphor particles is not always desirable.

  Another method of stabilizing a phosphor screen containing a hygroscopic phosphor is to add a stabilizing compound to the phosphor layer. This is disclosed for example in EP-A 0 234 385, 0506585, 0554421 and 0747908 and US-A 5,639,400 and 5,641,967. The compound reacts with the absorbed water and thereby prevents the reaction of the phosphor particles with water, or the compound reacts with the decay products formed by the reaction of the phosphor particles with moisture, thereby Prevents screen discoloration. Discoloration is well known as a common cause of degrading screen effectiveness. Thus, it is clear that the stabilizing substance has a finite working time. As water is continuously aspirated, the amount of unreacted stabilizing compound decreases over time. After a certain time, no unreacted stabilizing material remains and the phosphor screen experiences a delayed discoloration.

  Stabilizing compounds are known as additives to powdered phosphor screens, where the active layer is prepared by coating a lacquer consisting of phosphor particles, a binder and a solvent for the support. Some phosphor screens are manufactured by physical vapor deposition in a vacuum chamber, but the incorporation of a stabilizing compound into the deposited phosphor layer is not obvious. Yellowing of the phosphor containing iodine can be prevented by various stabilizing compounds. This is disclosed, for example, in EP-A 0 234 385, US Pat. No. 5,641,967 and JP-A 62-247300, 63-199306, 63-193097, 63-193098 and 63-193099 and JP-B 94-031909.

  A better way of protecting the phosphor screen involves the application of a protective coating. This is disclosed in EP-A 0209358, 0348172, 0654794 and US-A 4603253. There the coating is applied over an activation layer containing phosphor particles (this is also referred to as "phosphor layer"). The protective layer may be applied by several techniques. A less preferred method is to coat the polymer solution on the phosphor layer and subsequently evaporate the solvent by heating. A disadvantage of this technique is that the solvent may cause swelling and damage the phosphor layer. A more preferred method is to laminate a thin film on the phosphor layer. Another preferred method is to apply a lacquer of the monomer on the phosphor layer, for example by screen printing, and to crosslink the monomer by UV or electron beam irradiation, thereby forming a defect-free continuous topcoat layer. This is disclosed, for example, in US-A 5,520,965 and 5,607,774.

  However, all the above-mentioned techniques have the disadvantage that the edges of the phosphor layer remain unprotected. As water may penetrate the phosphor layer from the side as well, decomposition and discoloration may start at the edges and move further inwards.

  Edge protection layers can further be applied separately, which are disclosed in EP-A 0095188 and 0576054 and JP-A 63-193098 and JP-B 94-31914. This requires an additional step in the manufacturing process. In addition, the adhesion between the protective layer and the edge reinforcement layer is not perfect, which renders the edge reinforcement layer vulnerable. The use of a screen damages the edge enhancement layer and the screen discoloration at the edge can proceed locally again.

  Thorough use of a screen or panel that does not show a loss of image quality requires more than 3 years, more preferably more than 5 years, during which at least about 10,000 cycles should be performed on one and the same screen .

Solutions for overcoming the problems mentioned above, in particular those relating to moisture sensitivity, have been found in EP-A 1 286 362 and 1 286 365. This solution applies a protective layer over the phosphor layer by a chemical vapor deposition (hereinafter "CVD") method for uniform coating of the panel surface, whereby the screen is moved from the top of the screen to the edge of the back of the screen. It is completely enclosed in a protective coating that extends seamlessly up to, thus preventing moisture penetration at both the top and the rim. In a preferred embodiment thereof, the EP-A phosphor screen is a needle storage phosphor screen consisting of CsX: Eu ²⁺ storage phosphor, wherein X is selected from the group of halides consisting of Br and Cl. The moisture protection layer is a "parylene" layer. "Parylene" is a generic name for thermoplastic polymers and copolymers based on p-xylene and substituted p-xylene monomers.

  However, the problem remains severe and depends on the local climatic environment. If the panel is used and stored for a long period of time, moisture and oxygen are intrusive compounds, and the long periods specified above can degrade the excellent properties of the storage panel.

OBJECTS OF THE INVENTION In one embodiment, an object of the present invention is to provide a packaging material for a phosphor as a raw material for forming a phosphor panel.

  It is another object to provide a packaged phosphor panel coated with a phosphor layer.

  More preferably, the object is to provide a packaged storage phosphor panel, even more preferably to provide a storage phosphor panel coated with a needle-like phosphor which is at least completely protected against oxygen and moisture. Is the purpose.

  Immediately after production, i.e., before use, but also during normal use, for example in hospitals and against dust or debris, as in non-destructive testing applications such as, for example, inspection of battlefields or pipelines, aircraft and related test materials. It is yet another object to provide this protection to phosphor panels used in extremely harsh environments.

  Another objective within the same scope has been the development of packages that are cheaper and environmentally less environmentally benign.

  Other objects will be apparent from the summary, description, and claims as set forth below.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a packaged raw material for forming a phosphor screen and a formed phosphor screen, and thus a phosphor screen protected by a suitable packaging material. This object has been achieved by providing a packaging material as disclosed in the following detailed description and claims.

  More preferably, it is believed that the storage or stimulable phosphor panel, more particularly the screen coated with the needle-like phosphor described above, is suitably packaged and thus at least protected against moisture and oxygen.

  Further particular features of preferred embodiments of the invention are defined in the dependent claims.

  Other advantages and embodiments of the present invention will become apparent from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a preferred layer arrangement of a protective package foil particularly suitable for use for the packaging material according to the invention. The numbers of the successive layers in FIG. 1 are:-a metallized transparent polypropylene layer (1);
An adhesive layer (2);
An aluminum layer (3);
An adhesive layer (4);
-White opaque polyethylene layer (5)
Corresponding to

FIG. 2 shows another layer arrangement of the protective package foil. The numbers of the continuous layers in FIG. 2 are:-polyester layer (1 ');
An adhesive layer (2 ');
-An aluminum layer (3 ');
An adhesive layer (4 ');
-A stretched polyamide layer (5 ');
An adhesive layer (6 ');
-Colorless polyethylene layer (7 ')
Corresponding to

  Further description thereof can be found in the following description and examples.

DETAILED DESCRIPTION OF THE INVENTION In accordance with the present invention, an airtight or hermetically packaged phosphor screen or panel is disclosed. The packaged phosphor screen or panel comprises a sealed package and at least one (flat, square or rectangular) screen or panel optionally packaged separately in a packaging foil, wherein the package is an asymmetric barrier layer. Laminated in the form of a foil, wherein the foil comprises an inner soft thermoplastic polymer layer and an outer polymer layer, the outer polymer layer comprising an aluminum layer located between the inner soft thermoplastic polymer layer and the outer polymer layer. Adhesively contacting, optionally with another polymer layer between the aluminum layer and the inner soft thermoplastic polymer layer, wherein the foil is greater than ^2.5 N / mm ² according to DIN 53 357 Due to the adhesion between the polymer layer and the aluminum layer, 75% for 24 hours according to DIN 53 122 1 bar for each of oxygen, carbon dioxide and nitrogen according to DIN 53 380 (ISO 2556, ASTM D 1434) with a water vapor transmission of less than 0.01 g per square meter in an environment having a relative humidity of V and a temperature of 23 ° C. , Per hour, and less than 0.01 cm ³ per square meter.

The package for the developed phosphor screen comprises one or more phosphor screens or panels, which consist of supported or self-supporting screens or panels, wherein the phosphor-containing layer is essentially covered with a protective coating. The package is characterized by the presence of a foil, which as a whole is light-tight and air-tight in that: That is, the foil has oxygen, nitrogen and carbon dioxide in limited amounts of less than 0.01 cm ³ per bar, 24 hours and per square meter as determined according to DIN 53 380 (ISO 2556, ASTM D 1434). 75% relative humidity and 23 ° C. by air consisting of a compound selected from the group consisting of and by moisture with an amount of water of less than 0.01 g per 24 hours and per square meter as determined according to DIN 53 122. Permeable at temperature.

  In a preferred embodiment according to the invention, said outer polymer layer is a metallized polymer layer or a polyester layer. More preferably, said outer metallized polymer layer is a polypropylene layer. The thickness of the outer polymer layer is in the range of 15 μm to 25 μm for the polypropylene layer and 10 μm to 15 μm for the polyester layer.

As already mentioned above, in one embodiment the foil comprises an inner flexible thermoplastic polymer layer in adhesive contact with an aluminum layer, said foil being greater than ^2.5 N / mm ² measured according to DIN 53 357 , More preferably greater than 5 N / mm ² by the adhesion between the thermoplastic layer and the aluminum layer.

  In another embodiment, there is another polymer layer between the aluminum layer and the inner flexible thermoplastic polymer layer. This is preferably a (stretched) polyamide layer. In that case, the polyamide layer has a thickness in the range of 10 μm to 20 μm and the adhesive layer is between the polyamide layer and the aluminum layer on one side and the polyamide layer and the innermost soft thermoplastic on the other side. Exists between layers. In a preferred embodiment, the resistance to perforation should be at least 30N for a full-layer configuration as defined in this embodiment.

  According to the invention, said inner flexible thermoplastic polymer layer in the packaging foil comprises polyethylene, more preferably low density polyethylene. The thickness of the inner polyethylene layer is in the range of 50 μm to 100 μm, more preferably 70 μm to 90 μm. Said low density polyethylene (referred to as "LDPE") is preferred over high density polyethylene (HDPE). This is because HDPE is much less elastic and lacks heat sealability. Otherwise various low-density polyethylenes, such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), ultra-low-density polyethylene (ULDPE), etc., are produced by handling a screen panel in which the packaging foil is wrapped in this order. Does not have sufficient elastic recovery as it retains the depressions or dents. In order to solve this problem of damage to the inner polymer foil, and to avoid exceeding the value defined as an acceptable limit of oxygen and moisture penetration, the composition of the thermoplastic inner layer is changed to the damage of the inner layer ( It is recommended to choose to have a good compromise between the mechanical properties associated with the inner layer (eg, perforations) and the physical properties associated with the permeability of the inner layer. It is therefore recommended that the composition have a weight ratio of LLDPE to LDPE of greater than 2: 1 up to a ratio of about 7: 3. Therefore, the packaging should be strong enough to resist damage, especially at the work site. Otherwise, the flat needle-like image storage panel would already show corrosion before use, especially due to the presence of moisture due to poor storage conditions in the damaged package.

  In this regard, the asymmetric layer arrangement of the packaged screen or panel package according to the present invention should have a thickness ratio of the inner flexible thermoplastic layer to the outer polymer layer of at least 3: 1. The ratio can be greater than 7: 1.

  The low moisture permeable thin film used in the layer arrangement of the wrapping foil of the wrapped screen according to the present invention can include a thin film obtained by laminating the following resin: such as polytetrafluoroethylene and polytrifluoroethylene. Fluorinated resins, chlorinated rubber, polyvinylidene chloride, copolymers of vinylidene chloride and acrylonitrile, polyethylene and polypropylene, and thermoplastics already described above as the preferred moisture-resistant protective outermost layer of moisture-sensitive storage phosphor screens or panels. Polymers and copolymers based on p-xylene and substituted p-xylene monomers. Since moisture must be avoided, store the flat panels in sealed bag-shaped foils instead of loose packaging for storage, or store the bag-shaped foils with two heat-sealed sheets of said foil material. The two (same size) sheets (square or rectangular, depending on the shape of the storage phosphor screen or panel) are brought into contact with each other along the inner flexible thermoplastic polymer layer.

  The heat seal is according to the invention at least three heat-sealed sides so that the screen or panel can be entered to obtain a packaged screen or panel having at least three heat-sealed sides Is preferably advanced to produce a package in the form of a bag having In a preferred embodiment according to the invention, all sides are heat-sealed so that the object is optimally achieved.

  The packaged storage phosphor screen or panel is hermetically sealed, but in principle one side is left resealable. This may, for example, give the one side a negligible amount of glue, or alternatively give a Velcro strip to the opposing parts of both sheets, the resealable side being able to apply the pressure, e.g. The seal is resealed by simply rubbing with a finger. For example, if the panels are not used for some time and they should be protected against atmospheric environmental factors, especially against moisture and oxygen as contemplated in the present invention, such a resealable package may be used. It may be wise to have. Thus, according to the present invention, a packaged screen or panel is provided, said package having at least one resealable side. In the case of resealable packages, it is further recommended to have two asymmetric foils with different surface areas as described above, where there is a flange on one resealable side, said flange being heat sealed. Folded over the non-stopped side, said flange being given a velcro strip in the inner thermoplastic polymer layer after bending the flange over the edge of the non-heat-sealed side, to the corresponding side of the outer polymer layer Given its counterpart. In that case, in order to provide suitable protection against oxygen and moisture, the same means as described above (the Velcro at the corresponding part of the opening of the bag thus formed) is provided inside both the unsealed sides of the package. (Strips or adhesives) should be recommended.

  A packaged storage phosphor screen according to the present invention is stored in a bag containing a thermoplastic polymer foil defining its interior space to receive one or more storage panels, wherein the bag has an opening into the interior space, an opening in the opening. A peripheral flange and sealing means extending continuously along the lower surface of the lid flange and continuously around the entire surface of the flange to seal the lid flange and the upper surface of the backing sheet. And when the central region of the lid is spaced from the top surface of the backing sheet; it can be seen that the applied sealing means can hold vapors and gases coming from inside the interior surface.

  If the package contains more than one screen, it is recommended that there be no contact between the two screens to avoid any damage from contact during packaging or removal from the bag (eg, by rubbing). Is done. According to the invention, the wrapped screen or panel is provided in one package, said screen comprising at least a layer of a thermoplastic material, in a polymer wrapping foil surrounding said screen or panel, more preferably in a polyethylene wrap. All are packaged separately or, alternatively, the packages are selected around these screens so that there is no direct contact between the outermost layers of said screens. Thus, according to the present invention, a packaged screen or panel is provided, wherein at least one screen or panel is present, optionally packaged separately in a polymer sheet package. For example, in the case of three screens present in a package as specified, it is recommended to have the packaging around the panel, between two other screens. In another embodiment, more than one flat panel can be stored in the package of the wrapped screen according to the present invention. Alternatively, an aluminum foil or sheet, cardboard or plastic sheet may be further placed between the stacked storage panels and packaged together in a foil wrap as described above. A thin (anti-static) cloth, paper or folder instead of conductive aluminum foil to avoid sparks (due to electrostatic discharge) at the moment when the panel is individually removed from the package, and a thermoplastic, easily peelable resin It can alternatively be located between the layers.

  In contrast to a resealable bag having at least one screen or panel inside as described above, a package of a heat sealed packaged screen (eg a bag already heat sealed on three sides) After placing the screen in it, the four sides of the two foils in contact by heat sealing the fourth side) should be opened in a "destructive" manner. is there. To avoid the additional use of any means, such as knives or scissors, the most common way to open a completely heat sealed bag is to tear and open the bag.

  Thus, the present invention provides a packaged screen or panel wherein at least one of said heat sealed sides has a cut in its edge. It is particularly preferred that there are two cuts on the opposite side of each of its edges, as it is preferred that the package as defined for such a wrapped screen or panel can be opened by hand.

  For a completely heat-sealed package, it is recommended to have only one screen or panel in the package.

  If the package tears, it is not suitable for further use. Accordingly, a package in the form of a bag that can be opened non-destructively or resealably provides a temporary storage of the storage phosphor screen or panel to provide it with an environment of oxygen, moisture and dust or other impurities. It is particularly recommended to protect against dynamic attacks.

  When sealed in such a way, it is important to have an indication of where the package can be opened. Accordingly, it is preferred to open such a package by tearing from the site of the heat-sealed rim where at least one cut is present, and more preferably to open the package and remove at most one side thereof by two Notches are present, thus providing for the removal of the flat phosphor storage panel from the package.

  The dimensions of such a bag or package are adapted to the dimensions of the screen or of the panel itself: 25 cm x 25 cm is an example of such a panel, so that, taking into account the thickness of the panel, a bag of at least 30 cm x 30 cm is one panel Desirable to accommodate. Other dimensions suitable for practical use are 15 × 30, 18 × 24, 18 × 43, 20 × 40, 24 × 30, 30 × 43, for storage phosphor panels (in cm / cm). 35 × 35 and 35 × 43; 20 × 60, 30 × 40 and 30 × 90 for conventional blue intensifying screens; 15 × 40, 20 × 96, 24 × 24, for green intensifying screens. 30 × 100, 30 × 30 and 40 × 40; and 10 × 500 for non-destructive screens.

  In a preferred embodiment, the package as defined is placed under an inert gas such as nitrogen or argon (e.g., sealing the bag while blowing the inert gas into the bag) or alternatively under reduced pressure with at least the remaining ( When the fourth) side is heat-sealed, it is sealed by heat sealing.

  In addition to being protected against oxygen and moisture, the screen or panel so packaged should be protected against oils and fatty acids and greases due to the impermeability of the package according to the invention.

  In all embodiments of the packaging material there may be compartments for holding the desiccant. Alternatively, a moisture control material in the form of a foil on each side of the storage phosphor panel and / or between the surfaces of the panel may also be present. A water-absorbing resin such as poly (sodium acrylate) is dispersed on a thin film support coated with an adhesive binder such as a hot melt polymer and latex, and then coated with a cloth, thin film or paper to form a high core as a core. A sheet having a water-absorbent resin-containing layer is produced, which is then impregnated with an aqueous salt solution, whereby a moisture control material can be produced. In this case, disinfectants and preservatives can be further used with it.

  Particularly preferably with respect to moisture, the wrapped screens or panels according to the invention are additionally provided with silica gel (packaged or coated) as moisture absorber. The packaged silica gel is preferably present inside the package together with a screen or panel.

  In the same form, in addition to the desiccant described above, an oxygen absorber may additionally be present, said absorber comprising, for example, iron powder, oxidation accelerators and fillers. Here, the oxidation accelerator is preferably selected from the group consisting of a halide of an alkali metal or an alkaline earth metal, a halide of an ion exchange resin, hydrochloric acid, hypochlorite or a mixture thereof. Meanwhile, the filler is at least one substance selected from the group consisting of activated carbon, potassium carbonate, perlite, zeolite, activated alumina, iron oxide, alkaline earth metal oxide and gypsum.

  In yet another embodiment, the present invention provides a package having a protective package for handling and storing the product to protect the screen or panel (in addition to moisture and oxygen) against electrostatic discharge, impact, corrosion and contamination. Storage phosphor screens. In particular, a multilayer protective bag or bag for handling and storing one or more storage phosphor panels containing stimulable phosphors which are subject to possible damage by impact is bubble wrapped on its inner part in contact with a thermoplastic inner layer. Absorbing means, which may comprise a layer and thus are arranged around at least a part of the screen or panel thus packaged, protect the screen or panel against mechanical forces (especially from the outside).

  The essential feature of having a package with an impermeable layer composition is therefore the combination of at least the aluminum layer in contact with one heat-sealable thermoplastic layer as the inner layer of the package close to the panel, i.e. in a gas-tight manner. To a very limited extent from the group consisting of oxygen, nitrogen and carbon dioxide in an amount of less than 0.01 ml per bar, 24 hours and per square meter each determined according to DIN 53 122 Air consisting of the selected compound is permeated at a temperature of 23 ° C. and at a relative humidity of 75% and less than 0.01 g of water per 24 hours and per square meter according to DIN 53 380 (ISO 2556, ASTM D 1434) Permeation of moisture.

  In exploring alternatives to polyethylene thin film sheets used as separate packaging sheets for panels present in packages according to the present invention or as inner thermoplastic layers, various monolayers such as polyvinyl chloride (PVC) thin films were investigated. Although thin films were considered, most of them are not considered commercially acceptable and do not give good performance. Thus, high density polyethylene (HDPE) is much less elastic to be useful as a commercial package and lacks heat sealability. On the other hand, various low-density polyethylenes (eg, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), ultra-low-density polyethylene (ULDPE), etc.) have dents or dents caused by handling the screen or panel in which the package is packaged. Do not have sufficient elastic recovery.

  The heat-sealable thermoplastic layer of the package inside the package is such that the package is easily peeled open by breaking only the surface layer of the thermoplastic layer ("easy release resin coating"). Be placed. In the method mentioned, the usual tear strip may be omitted to open the package.

  A layer of aluminum having a thickness of less than 15 μm, preferably in the range of 6 to 10 μm, is adhesively bonded on one side to the outermost polymer layer and on the other side to the innermost thermoplastic layer. Are also bonded adhesively.

In accordance with the present invention, an outermost metallized coating has a layer arrangement that provides a limited range of physical strength and gas (especially oxygen, carbon dioxide and nitrogen) permeability as defined in the claims. Preferably, the polymer layer is a (transparent) polypropylene layer. In principle, thermoplastic polymers and copolymers based on p-xylene and substituted p-xylene monomers already mentioned above and known as the preferred moisture-resistant protective outermost layer of the moisture-sensitive storage phosphor screen or panel are on top of the outermost layer. Can be coated. This is to avoid too high complexity and / or costs for coating and composition. It is not preferred that such additional outermost layer be on top. This is more so if there is a moisture resistant coating in the innermost layer. Accordingly, preferred outermost transparent polypropylene layers have a thickness of less than 25 μm. The thickness of the adhesive layer present between the successive layers as defined in the layer arrangement of the asymmetric wrapping foil is in the range from 1 μm to 5 μm. Thus, the adhesive layer between polypropylene and aluminum or between polyester and aluminum is less than 5 μm (preferably about 3 μm and thus less than 5 g of adhesive per square meter, more preferably 3.5 gm per square meter.被覆 4.5 g of adhesive) and should provide an adhesion determined as described in DIN 53 357 of at least 2.5 N / mm ² .

The adhesion between the polyethylene layer and the aluminum layer coated in about the same amount and in about the same thickness as described above should be at least 5.0 N / mm ² (measured as specified in DIN 53 357). Value for the applied adhesion).

  Alternatively, preferred transparent polymers to provide an oxygen barrier are formed from unsubstituted ethylenically unsaturated hydrocarbons. These polymers include, but are not limited to, polyisoprene (eg, trans-polyisopropylene), polybutadiene (especially 1,2-polybutadiene, which has more than 50% 1,2 microstructure). Diene polymers such as polybutadienes), and their copolymers (eg, styrene-butadiene). Such hydrocarbons include polymeric compounds such as polypentenamers, polyoctenamers, and other polymers made by olefin metathesis; diene oligomers such as squalene; and dicyclopentadiene, norbornadiene, 5-ethylidene-2-norbornene, or more than one carbon- Includes polymers and copolymers derived from other monomers containing carbon double bonds (conjugated or non-conjugated). These hydrocarbons further include carotenoids such as β-carotene. Preferred substituted ethylenically unsaturated hydrocarbons include, but are not limited to: esters, carboxylic acids, aldehydes, ethers, ketones, alcohols, containing oxygen such as peroxides and / or hydroperoxides Those with components. Particular examples of such hydrocarbons are condensation polymers such as polyesters derived from monomers containing carbon-carbon double bonds; unsaturated fatty acids such as oleic acid, ricinoleic acid, dehydrated ricinoleic acid and linoleic acid, and derivatives thereof; Examples include, but are not limited to, esters. Such hydrocarbons also include polymers or copolymers derived from (meth) allyl (meth) acrylate. The composition used is substituted or unsubstituted ethylene-free, provided that the adhesive strength between the layer and aluminum and the adhesive layer as defined above for the same thickness of the polymer layer is guaranteed. It may also contain a mixture of two or more saturated hydrocarbons.

  Since the outermost oxygen scavenging layer in the layer arrangement of the packaged screen or panel package according to the present invention can be transparent, 1,2-polybutadiene is transparent, similar to the transparency, mechanical and processing properties of polypropylene. It can be used as a component showing properties, mechanical properties and processing properties. In addition, the polymer retains its transparency and mechanical integrity even after most or all of its oxygen scavenging capacity has been exhausted, and even when little or no diluent resin is present. Was found. Furthermore, 1,2-polybutadiene exhibits a relatively high oxygen scavenging capacity, and once it begins to scavenge oxygen, it exhibits a relatively high scavenging rate. As an alternative to minimizing oxygen permeation, the multilayer package preferably includes a layer comprising an ethylene polymer having siloxane crosslinks as the outermost layer. In another embodiment, the multilayer film comprises a layer of ethylene vinyl acetate copolymer as the outermost layer.

  In a further embodiment of the invention, the packaged screen or panel package according to the invention is provided with an antistatic coating on at least one side of the (multi-layer) foil. More preferably, such an antistatic layer is provided on the outer layer and / or inner thermoplastic polymer layer of the storage panel. Because the removal of the storage phosphor panel from the package may lead to electrostatic charging / discharging phenomena even if the aluminum foil is conductive, and may (partly) reduce adverse effects depending on environmental conditions. is there. The problem will be particularly acute in "dry" atmospheres where low relative humidity is measured.

  In addition, the absorption of IR radiation and the resulting heating of the contents by the package is minimized because the aluminum layer forms a highly reflective surface.

In an optional embodiment where one or more antistatic layers are present on the thermoplastic layer of the foil and / or the outer layer of the storage panel, the minimum between the antistatic layer and the outer layer of the storage panel in direct contact with each other. The use of an antistatic agent in the coated layer formulation should be recommended to obtain a possible triboelectric difference. Thus, a coating composition containing the same antistatic agent may be applied both on the protective outer layer (or in the layer) and on the thermoplastic polymer layer of the storage phosphor panel. Examples of the antistatic agent include a sulfonic acid group, a sulfate group, a phosphate group, a quaternary ammonium base, a tertiary sulfonium base, a water-soluble conductive polymer having at least one conductive group selected from a carboxyl group and a polyoxyethylene group. Can be used. The conductive group may be bonded directly to the polymer via a divalent linking group or directly to an aromatic or heterocyclic ring such as a benzene or pyridine ring. The conductive polymer may further include at least one group selected from styrene, vinylidene chloride, acrylic acid, methacrylic acid, itaconic acid, itaconic acid ester or butadiene. The most useful polymers for practicing the present invention have an average molecular weight of from about 10 ³ to 10 ⁶ generally. In the outer protective layer can be a conductive polymer in an amount ranging from 0.0001~10g / ^{m 2} expressed as solids are added, the range amount is more preferably from 0.001 to 1 g / ^{m 2} It is. Instead of or in addition to the conductive polymer, the antistatic layer may include an antistatic compound. Particularly preferred antistatic compounds are fluorinated compounds, especially fluorinated surfactants, for example perfluorocaprylic acid or a salt thereof and a hydrophilic polymer having polyoxyethylene units and terminal fluorinated groups. Preferred fluorinated compounds for use in the packaged storage screen assembly according to the present invention are those having an oxyethylene group of the formula RF-AX, wherein RF contains at least three fluorine atoms. A represents a partially or wholly fluorinated hydrocarbon chain, wherein A is a chemical bond, a divalent hydrocarbon group including a divalent hydrocarbon group interrupted by one or more heteroatoms, or a group -COO. , -CON (R) -, - SO 2 N (R) - or _SO represents 2 N (R) CO, R is an alkyl containing hydrogen or 1-5 C atoms, X is one or more Represents a hydrophilic oxyalkylene group containing an oxyethylene group.

Moreover, none of the polyethylene oxide polymers are generally known may be useful as an antistatic agent: Preferred antistatic agents are generally expressed as _{R-O- (CH 2 CH 2} O) n -H A polyethylene oxide compound, wherein n is an integer of at least 4, preferably 8 to 30, and R represents a long-chain alkyl or alkylaryl group having at least 10 C atoms, such as, for example, oleyl. Antistatic agents different from the antistatic agents described above can be present as a mixture in the antistatic layer in the present invention, and the mixture can be the same or different for different antistatic layers. The antistatic layer may further include a latex. Such latexes preferably include an acrylate or methacrylate component esterified with an alkyl group in the polymer molecule, if present. Examples of such latex components include methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate.

  Methods for coating the above-described packages with at least one antistatic coating layer are well known from the prior art. The at least one antistatic coating may be a heat-sealed thermoplastic polymer for use as an inner layer of a packaged storage phosphor screen of the present invention by roller coating, slide hopper coating, curtain coating, spray coating or preferably gravure printing. May be applied. At least one antistatic layer can be applied on top of the outer layer of the storage panel, for example by a preferred spray coating technique. Alternatively, at least one antistatic agent may be added to the outer layer of the storage panel layer.

Use by removing the storage panel from its packaging material by using a storage phosphor panel individually packaged in a thermoplastic package having an antistatic layer, where the storage panel and the thermoplastic package are in intimate contact. Problems caused by previous electrostatic charging can be avoided or substantially reduced. Alternatively, the package described above may be coated or contained with an effective amount of a conductive compound that reduces the transverse electrical resistance, if present. A particular conductive compound suitable for use therein is a polythiophene compound. The polythiophene compound, if present, is preferably incorporated into the antistatic layer as an aqueous dispersion of a polythiophene compound / polymer anion complex, and in a preferred embodiment, the polymer anion is a polystyrene sulfonate. The polythiophene conductive compound which provides the ability to reduce the applied lateral electrical resistance to a level of less than 10 ¹¹ Ohm / square is preferably polyethylene dioxythiophene (PEDT). Alternatively, the conductive compound is an element selected from the group consisting of tin oxide, indium tin oxide, and vanadium oxide, or a group consisting of polyaniline, a tetracyanoquinone (TCNQ) complex, a quaternary ammonium compound, and a sulfonated compound. The element to be selected. In a preferred embodiment, the compound or mixture of compounds is a perfluorinated surfactant or comprises a fluorosurfactant, the layer packaging of the packaging material comprises an adhesive layer and a rigid polymer resin, an alternative method. In the above, it is represented as including a coated soft polymer layer and a coated hard polymer layer. The polymer layer may further comprise, in addition to the antistatic layer described above, a matting agent in order to avoid undesired lubricity from an operational point of view. PMMA is preferred as the matting agent. In a further particular embodiment, said antistatic layer further comprises an anti-scratch agent. In a preferred embodiment, the anti-scratch agent is a polysiloxane-polyether copolymer.

  The above-mentioned polymers and compounds for use in the packaged storage panel according to the invention show, as a special advantage, excellent protection of the storage panel, in particular with regard to the resistance to solvents and the influence of the external atmosphere, such as moisture and oxygen permeability, Comparable to materials such as glass and ceramic materials. The handling of such packages is even more advantageous. This is because it is superior to the materials mentioned as well as, for example, polyacetylene or polypyrrole polymers.

  The packaged storage phosphor panel according to the invention further usually carries information readable by opto-electronic devices. Such a device may be present on the package itself, or the package may include a transparent portion, such as a window, covering the information. The information can be in the form of, but not limited to, a barcode, chip, or label.

  Within the scope of the present invention, the binder-free photostimulable phosphor screen to be packaged is in a preferred embodiment a protective layer comprising, in addition to the fluorine atom-bearing component, also polymer beads, optionally a nanocrystal. Overcoated with a protective layer containing the dyestuff compound or a combination thereof.

  Surfaces due to soiling and abrasion after multiple uses to provide an image storage panel with high surface durability, i.e., easy handling and excellent image quality without increased screen structure noise (improved sharpness) To avoid damage, the radiation image storage panel includes a protective coating characterized by: That is, in addition to the binder, the protective coating comprises a white pigment, the white pigment having a reflection index greater than 1.6, preferably greater than 2.0, and more specifically, the white pigment is titanium dioxide. , Which are present in the binder and optionally further comprise a urethane acrylate, wherein the protective coating has a surface roughness (Rz) of 2 μm to 10 μm as disclosed in EP-A 1318525.

  Instead, the protective layer comprises a polymer compound selected from the group consisting of a vinyl resin containing a component derived from an ester of acrylic acid and a vinyl resin containing a component derived from an ester of methacrylic acid, and more preferably March 8, 2002. EP Patent Application No. Thermoplastic rubber as disclosed in U.S. Pat. No. 2,100,235. For sharpness, the polymer further comprises at least one colorant, more preferably a colorant having the same absorption characteristics for stimulating radiation as the colorant deposited by chemical vapor deposition as described above.

As the outermost layer, a parylene layer is highly desirable as a moisture barrier as disclosed in EP-A 128,362 and 1,286,365. In yet another embodiment according to the invention, poly (p-xylene) (= parylene), poly (p-2-chloro-xylene), poly (p-2,6-dichloroxylene) and fluorine-substituted poly (p- xylene), MgF _2, or binderless photostimulable phosphor screen that has been overcoated with a protective layer which is vacuum deposited a combination thereof are provided. Said technique is advantageously applied in this case, as chemical vapor deposition is a technique that can be applied when using these compounds. This makes “Parylene” particularly provide excellent moisture resistance, while MgF ₂ provides excellent anti-reflective properties.

  The screens or panels according to the invention can also have reinforced edges, for example as described in US-A 5,334,842 and US-A 5,340,661.

  The invention in a particularly preferred embodiment further comprises a binder-free phosphor panel.

The storage phosphor used for the panel or screen is preferably an alkali metal storage phosphor. Such phosphors are disclosed in US Pat. No. 5,736,069 and correspond to the following formula:
M ¹⁺ X. aM ²⁺ X ′ ₂ bM ³⁺ X ″ ₃ : cZ
^Wherein M ¹⁺ is at least one element selected from the group consisting of Li, Na, K, Cs and Rb, and M ²⁺ is Be, Mg, Ca, Sr, Ba, Zn, Cd, Cu, Pb and At least one element selected from the group consisting of Ni, wherein M ³⁺ is Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Z is at least one element selected from the group consisting of Lu, Al, Bi, In and Ga, and Z is at least one element selected from the group consisting of Ga ¹⁺ , Ge ²⁺ , Sn ²⁺ , Sb ³⁺ and As ^3+. X, X ′ and X ″ may be the same or different and each represents a halogen atom selected from the group consisting of F, Br, Cl and I, and 0 ≦ a ≦ 1, 0 ≦ b ≦ 1 and 0 <c ≦ 0. It is.

A particularly preferred phosphor for use in the panel or screen of the present invention is a CsX: Eu stimulable phosphor, wherein X represents a halide selected from the group consisting of Br and Cl, wherein the phosphor comprises the following steps: Produced by a method that includes:
- EuOX _', EuX' ₂ and EuX _'3 (where, X' is F, Cl, an element of one selected from the group consisting of Br and I) ¹⁰ of europium compound selected from the group consisting of ^-3 Mixing the CsX with ~ 5 mol%;
Burning the mixture at a temperature of 450 ° C. or higher;
-Cooling the mixture; and-recovering the CsX: Eu phosphor.

  Such phosphors are disclosed in EP-A 1203394.

  Preferably, the phosphor is vacuum deposited on a support under the conditions disclosed in EP-A-111458 and EP-A-1118540.

  EP Patent Application No. Certain embodiments may be applied, such as those described in U.S. Pat. Nos. 02100295, 02100296, 02100297 and 02100298, all filed on March 26, 2002, and EP Patent Application No. Certain embodiments, such as those described in 210763, 02100764 and 02100765, all filed on June 28, 2002, may also apply.

  Accordingly, the moisture-proof insulating thin film is preferably present on the phosphor layer, and most preferably said thin film is obtained by CVD (chemical vapor deposition) formed on a phosphor screen or panel. The phosphor screen or panel thus formed is characterized by a moisture-proof protective overcoat layer, which preferably has the protective layer on a part of the support having a surface larger than the main surface of said phosphor layer. Whereby the phosphor layer leaves a portion of the support open and the protective overcoat layer covers at least a portion of the portion of the support that was left open by the phosphor layer. I do. The anti-moisture protective overcoat layer is usually the outermost layer and covers the surface of the phosphor layer, said surface being smaller than the surface of the support so that the phosphor layer does not reach the edge of the support. Panels with a support having a surface larger than the major surface of the phosphor layer leave a portion of the support open, while the moisture-resistant protective layer leaves a portion of the support left open by the phosphor layer. At least partially. The advantage of such an arrangement lies in the fact that the edges of the phosphor do not contact the mechanical parts of the device and are therefore not easily damaged during use of the panel, especially during transport, for example in a scanner. Another advantage of this configuration is that no special edge reinforcement is required (but additional edge reinforcement can be applied if desired). Such a configuration of the phosphor panel, in which the surface of the phosphor layer is smaller than the surface of the support and therefore the phosphor layer does not reach the edge of the support, represents a particularly preferred embodiment of the invention, and such a configuration is known in the art. It can be advantageous for the manufacture of any phosphor panel coated with any known protective layer. In such a phosphor panel, the moisture protection layer typically has a thickness in the range of 0.05 μm to 15 μm, more preferably 1 μm to 10 μm.

  As suggested above, the anti-moisture protective overcoat layer is usually the outermost layer of the panel, but in other embodiments the layer is for additional protection, e.g., for protection against dust, scratches and damage. It may be further overcoated with another outermost layer. In that case, it is recommended to have a polymer layer, and more preferably to have a radiation-cured polymer layer as the outermost layer. If a layer with very low water permeability is deposited as in the present invention on such a phosphor layer having acicular phosphor crystals separated by voids, this layer is a chemical vapor deposited parylene layer Preferably, on the other hand, such a layer not only covers the surface of the needle crystals, but also the voids between the needle crystals, thus completely protecting the edges of the phosphor needle crystals against moisture.

  In summary, and on the other hand, expressed in another way, one or more thermoplastic bubbles or blisters consisting of two plastic foils that come together near the perimeter to seal the product enclosed therein A preferred package or blister that completely contains the storage phosphor panel is thus provided and does not escape anything from the product, and that moisture or oxygen does not enter the blister before opening said blister. (Or at least to the limited extent as described above according to the corresponding DIN procedure) and further ensure that the objects of the invention will be fully achieved. . The packaged storage panels of the present invention are subject to a number of adverse conditions (eg, oxygen and moisture, mechanical forces such as electrostatic discharge, corrosion, contamination and impact, and elevated heat (without blistering, bubbling, cracking). Or further including any dust or oil permeation) and is perfectly suitable for use in extremely harsh climatic conditions, such as tropical and polar climates.

It is noted that in addition to the storage phosphor panel, the luminescent intensifying screen can also be packaged in a package as described above, and that such packaging material is used for the application as specified herein. It is self-evident that it is not restricted. According to the invention, the use of a sealed package for screens or panels and for raw materials for manufacturing said screens or panels is also claimed, wherein the package is asymmetric. Wherein the foil comprises an inner soft thermoplastic polymer layer and an outer polymer layer, wherein the outer polymer layer is located between the inner soft thermoplastic polymer layer and the outer polymer layer. For 24 hours according to DIN 53 122 due to the adhesive force between the outer polymer layer and the aluminum layer in adhesive contact with the aluminum layer, wherein the foil is greater than ^2.5 N / mm ² according to DIN 53 357 Less than 0.01 g water vapor per square meter in an environment having a relative humidity of 75% RV and a temperature of 23 ° C. Ri, and oxygen in accordance with DIN 53 380 (ISO 2556, ASTM D 1434), per 1 bar for each of the carbon dioxide and nitrogen, characterized by a transmission of less than 24 hours and per 1 sq. M per 0.01 cm ^3. The package may optionally have further desirable or preferred options as described above in the detailed description of the invention.

  Apart from the screen or panel, all the raw materials, in particular the components required to produce the phosphor itself (including the phosphor itself), are exposed to harsh temperature and humidity conditions for prolonged periods (days to months and months). Even the year) would be preserved.

  The following examples illustrate, but do not limit, the invention.

EXAMPLES While the invention will be described in connection with the preferred embodiments thereof, it will be understood that it is not intended to limit the invention to those embodiments.

Layer Formation of Package for Storage Phosphor Panel An asymmetric protective barrier foil as shown in FIG. 1 was formed as follows (starting from the side used as the outermost layer of the packaged storage phosphor panel) ):
-1. Metallized transparent polypropylene; 21 μm thickness;
-2. Adhesive layer, coated with 4 g / m ² ; 3 μm thickness;
-3. Aluminum layer; 7 μm thickness;
-4. Adhesive layer, coated with 4 g / m ² ; 3 μm thickness;
-5. White opaque polyethylene layer (70% LLDPE / 30LDPE); 75 μm.
The bond strength expressed in N / mm ² was measured:
Determining between 1 and 3 as specified in DIN 53 357: 3.1N
Between 5 and 3, determined as specified in DIN 53 357: 5.9N.

  The asymmetric barrier layer was cut into two squares measuring 30 cm x 30 cm. The inner thermoplastic polyethylene layers were placed in contact with each other and the polyethylene layers were heat sealed on three common sides to obtain a heat sealed area about 1 cm wide.

  After completely inserting the exemplary storage phosphor screen described above into the bag or bag thus produced, the fourth side was heat sealed under the addition of an inert gas: storage phosphor panel surface and inside The air inside the bag between the polyethylene foils was flushed with argon before sealing the package.

  In this way, a storage phosphor screen was manufactured for further packaging experiments.

Example 1
Composition of phosphor screen antihalation undercoat layer:
Solution A:
MOWILITH CT5 (from HOECST AG) 300g
700 g of ethanol
CYMEL 300 60g
12 g of p-toluenesulfonic acid
Solution B ^* :
Thiarimethane Dye-1 0.750g
150 g of ethanol
Sodium hydroxide 0.08g
* Sixteen hours after preparation, solution B was filtered to give a reddish brown solution.
Coating solution:
33.3 g of solution A
Solution B 3.0 g
63.6 g of ethanol

The coating solution is applied at a speed of 4 m / min on a polyethylene terephthalate support having reflective properties (containing BaSO ₄ particles) or absorbing properties (with carbon black particles) (see also Table 1). Coated by dip coating technique.

  Thermal curing was performed overnight at 80 ° after drying.

Characteristics of the antihalation layer thus obtained . Absorption of 0.22 at a wavelength of 633 nm (HeNe laser emission wavelength). No substantial absorption is measured at the emission wavelength of the stimulable phosphor (having its maximum emission at 390 nm).

Phosphor layer composition:
BAEROSTAB M36 (from Baerloecher GmbH) 1.5g
DISPERSE AYD 9100
(From Daniel products Company) 0.75g
KRATON FG19101X
(From Shell Chemicals) 12.5g
BaSrFBr: Eu (average particle size: 7 μm) 270 g
BaSrFBr: Eu (average particle size: 3 μm) 30 g

Preparation of the phosphor lacquer composition:
BAEROSTAB M36, DISPERSE AYD 9100 and KRATON FG19101X are dissolved with stirring in a predefined amount of 61.5 g of a solvent mixture of 50:30:20 by volume of washed benzene 100-120, toluene and butyl acrylate. Was. The phosphor was then added and 1700 r.p. p. m. The stirring was continued for another 10 minutes at the speed described above.

  The composition was doctor blade coated on a primed 175 μm thick polyethylene terephthalate support at a coating speed of 2.5 m / min and dried at room temperature for 30 minutes. The coated phosphor plate was dried at 90 ° C. in a drying stove to remove volatile solvents as much as possible.

  It was confirmed that a layer composition having good curing characteristics was obtained. In addition, no diffusion of the colorant from the intermediate antihalation layer between the support and the phosphor layer into the phosphor layer was found: this particular dye has the advantage of being soluble in ethanol, It is insoluble in the solvents present in the phosphor layer coating composition.

Measurement of sensitivity S and square wave response SWR for stimulable phosphor screens Image of S and SWR measurements for photostimulable phosphor screens coated with BaSrFBr: Eu ²⁺ phosphor made using He-Ne laser Made in the scanner. The beam of a 30 mW red He-Ne laser was focused to a small spot of 114 μm (FMWH) using optics including a beam expander and collimating lens. A mirror galvanometer was used to scan this small laser spot over the full width of the phosphor sample. During this scanning procedure, the phosphor was stimulated and the emitted light was captured by a row of optical fibers located on one line. A high electron multiplier was placed at the other end of the optical fiber provided in the circle.

  An optical filter of type BG3 from SCOTT was placed between the optical fiber and the photomultiplier to attenuate the stimulating light. Thus, only light emitted by the phosphor was measured. The small current of the photomultiplier was first amplified using an I / V converter and digitized using an A / D converter.

  The measurement device was connected to an HP9826 computer and an HP6944 multiprogrammer to control the measurements. At the beginning of the procedure the electronic shutter was closed to shut off the laser. A phosphor sample measuring 50 mm × 210 mm was excited with an 80 kV X-ray source provided with a 12 mm thick aluminum filter. Radiation dose was measured using a FARMER dosimeter. A thin lead raster containing seven different spatial frequencies between the X-ray source and the phosphor layer was provided to modulate the X-ray emission. The frequencies used were 0.025, 0.50, 1.00, 2.00, 3.00, 4.00 and 5.00 line pairs per mm. After exposure, the samples were placed in a laser scanner. The shutter was opened to read one line and the galvanometer was moved linearly. During the scanning procedure, the emitted light was continuously measured using an A / D converter at a sampling rate frequency of 100 kHz and stored in a multi-programmer memory card. After scanning one line, the plate was moved over a distance of 114 μm and the next line was read. Once the operation was completed, the shutter was closed again and the galvanometer was put back in its original position.

  The various scan lines were transferred from the memory card in the multi-programmer to the computer, where the data was analyzed. The first correction took into account the change in sensitivity of the scan line with distance. Therefore, the calibration scan was previously measured on a phosphor sample that was completely uniformly exposed. The second correction took into account the X-ray dose by dividing the value by the dose.

  The different blocks in the line scan of the grid were separated and the amplitude for each spatial frequency was calculated using Fourier analysis. The amplitude of the first block having a spatial frequency of 0.025 line pairs per mm was taken as the zero frequency amplitude and used to normalize the amplitude for all frequencies for the grid. These normalized results are Square Wave Responses (SWR: SWR1 corresponds to one line pair response per mm, SWR2 corresponds to two line pairs response per mm), and The screen resolution was representative.

  Apart from those measurements, the erasability of the storage phosphor screen was measured: the screen was therefore uniformly illuminated at 80 kVp (10 mm Al filter) at a dose of about 50 mR. The screen was read with a flying spot scanner. The scanning light source was a 30 mW diode laser emitting at 690 nm. A 4 mm Hoya BG-39 ™ filter was used to separate the stimulating light from the light emitted by the phosphor screen. The scanning average level (SAL) was determined as the average signal output of the scanning device for the selected line after application of a high pass filter set to 0.1. The results of this measurement were noted as SAL values for different screen samples.

  Table 1 combines the data measured for screen speed and sharpness and is expressed in relative units. There, the reference storage panel (see EX1) is set to a value of “100”. The samples were stored for several days at the temperature (in ° C.) and relative humidity (in%) as shown in Table 1.

  All of these panels were tested without any protection.

  As can be concluded from the figures summarized in Table 1 above, the relative quality figures are indicators of a strong loss that increases with time (days) and temperature for a saturated relative humidity set to 100%. is there.

Example 2
The storage phosphor screen was manufactured in the same manner as in Example 1. The data measured for screen speed and sharpness in Table 2 are again combined and again expressed in relative units. There, the reference storage panel (see EX8) is set to a value of “100”. The samples were stored for several days at harsh conditions at the temperature (in ° C.) and relative temperature (in%) as shown in Table 2. The reference panel was again tested without any protection, while the other panels with the same composition (see Sample Nos. 7984/3 and 7984/5) were tested without any protection.

A “Type 2” bag is a “Type 1” bag (see bottom row of Table 2; “Type 1” means a layer arrangement as defined in FIG. 1) in the following respects: (See FIG. 2 with the following description of the asymmetric foil).
(Starting from the side for use as the outermost layer of the packaged storage phosphor panel):
1 '. A polyester layer having a thickness of 12 μm;
2 '. 3 μm thick adhesive layer;
3 '. An aluminum layer having a thickness of 9 μm;
4 '. 3 μm thick adhesive layer;
5 '. A 15 μm thick stretched polyamide layer;
6 '. 3 μm thick adhesive layer;
7 '. 80 μm thick colorless low density polyethylene layer (LDPE).

  As can be concluded from the results summarized in Table 2 below, the polyethylene bag closed by the adhesive tape (EX10) has a lesser degree compared to the quality without any protection under such harsh conditions (EX9). Degrade quality up to. In contrast, a clear improvement was observed when EX10 and EX11 were compared with each other.

  When the storage panel was removed from the packaging bag without aluminum stored at saturated relative temperature (100%), it was further observed that the storage phosphor panel was clearly coated with water droplets. No water droplets were observed when stored in bags with aluminum.

  Apart from the storage phosphor screens or panels (storage phosphor panels and sensitized luminescent panels) in the present invention, the raw materials (all "building blocks" of the screen, more preferably the starting materials for the production of the phosphor and the powder form) It is clear that the phosphor itself) is advantageously stored in the package according to the invention. For storage phosphor panels as defined, better reproducibility, better intrinsic quality and better erasability can be achieved.

  It will now be apparent to those skilled in the art that numerous modifications may be made without departing from the scope of the present invention, as detailed in the preferred embodiments of the invention, and the invention, therefore, refers to the foregoing description. Instead, they should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

1 shows a preferred layer arrangement of a protective packaging foil particularly suitable for use for the packaging material according to the invention. 3 shows another layer arrangement of the protective package foil.

Claims (2)

A packaged phosphor screen or panel comprising a sealed package and optionally at least one screen or panel separately packaged in packaging foil, said package being laminated in the form of an asymmetric barrier layer foil. Wherein the foil comprises an inner flexible thermoplastic polymer layer and an outer polymeric layer, wherein the outer polymeric layer is in adhesive contact with an aluminum layer located between the inner flexible thermoplastic polymer layer and the outer polymeric layer. The adhesion between the outer polymer layer and the aluminum layer, wherein the foil is greater than ^2.5 N / mm ² according to DIN 53 357, according to DIN 53 122, with a relative humidity of 75% RV for 24 hours and a temperature of 23 ° C. With less than 0.01 g of water vapor per square meter in an environment with temperature, and DIN 5333 80 (ISO 2556, ASTM D 1434), packaged phosphor screen or panel characterized by a transmission of less than 0.01 cm ³ per bar, 24 hours and per square meter for each of oxygen, carbon dioxide and nitrogen. . Use of a sealed package for a screen or panel or for raw materials for manufacturing said screen or panel, said package being laminated in the form of an asymmetric barrier layer foil, Comprises an inner soft thermoplastic polymer layer and an outer polymer layer, wherein the outer polymer layer is in adhesive contact with an aluminum layer located between the inner soft thermoplastic polymer layer and the outer polymer layer, wherein the foil is An environment having a relative humidity of 75% RV for 24 hours and a temperature of 23 ° C. for 24 hours according to DIN 53 122, due to the adhesion between the outer polymer layer and the aluminum layer greater than ^2.5 N / mm ² according to DIN 53 357 With a water vapor transmission of less than 0.01 g / m 2 and according to DIN 53 380 (ISO 2556, Oxygen according STM D 1434), per 1 bar for each of the carbon dioxide and nitrogen, use characterized by a transmission of less than 24 hours and per 1 sq. M per 0.01 cm ^3.

Images