LU87477A1 - TEMPORARILY ADHESIVE MATERIAL AND MANUFACTURING METHOD THEREOF - Google Patents

Description

The present invention relates to a temporarily adhesive material and its manufacturing process. The present invention mainly relates to a temporarily adhesive material which is preferably used as an adhesive material divided into a part adhering completely to a material and a part adhering weakly, whereby it results that, for example, a part comprising subjects confidential is temporarily covered, and if necessary, the weakly adhering part is detached from the material to gain access to the confidential part; the invention also relates to its manufacturing process.

We have developed, as we can see in the publication of the Japanese utility model no. 54-3789, a laminate which has a part with an internal frame which can be partially detached.

However, in order to facilitate this partial detachment operation, as can be seen in the publication of the Japanese utility model n ° 54-3789, a paper must possibly be partially detached by forming an adhesive surface obtained by the application of a dry paste over the entire surface of the paper and subjecting the other base material to a detachment operation such as a silicone treatment so as to partially detach it, or only a laminate of the laminated material is detached . Thus, in the laminated material of the prior art, since the dry paste must be applied to one side of the laminate and the release treatment such as the silicone treatment must be carried out on the other side during manufacture, the structures of the laminated material become complicated and result in high manufacturing costs due to the many manufacturing steps.

Consequently, the main object of the present invention is a temporarily adhesive material, in which the surface treatment of the material to be bonded is not necessary and where there is only a post-treatment of the temporarily adhesive material which has been bonded, a partially detachable part and a completely adhering part are divided so as to be used for various purposes to meet the needs of the user, as well as his manufacturing process.

A first invention involved relates to a temporarily adhesive material, comprising an opaque base material at least in part, an intermediate release layer formed on the main surface of the base material, a synthetic resin layer formed on the main surface of the intermediate layer. with at least a part of it transparent, and an adhesive layer formed on the main surface of the layer of synthetic resin and transparent in the part corresponding to the transparent part of the synthetic resin.

A second invention involved relates to a method of manufacturing a temporarily adhesive material, comprising a step of preparing an opaque base material at least in part, a step of preparing a synthetic resin film or sheet to form a layer of synthetic resin transparent at least in part, a. step of forming on the main surface of the synthetic resin film or sheet a transparent adhesive layer in the part corresponding to the transparent part of the synthetic resin film or sheet, a step of printing or applying a intermediate release agent at least on the main part of the base material or on the synthetic resin film or sheet, and a step of forming an intermediate release layer between the base material and the synthetic resin layer consisting of the synthetic resin film or sheet by laminating this film or sheet on the base material using the intermediate release agent.

A third invention involved relates to another method of manufacturing a temporarily adhesive material comprising a step of preparing an opaque base material at least in part, a step of forming an intermediate release layer by printing or applying a release agent on the main surface of the base material, a step of forming a transparent synthetic resin layer at least in part by printing or applying a synthetic resin agent on the main surface of the intermediate release layer and a step of forming an adhesive layer on the surface of the synthetic resin layer, this adhesive layer being transparent in the part corresponding to the transparent part of the synthetic resin layer.

According to the present invention, the intermediate release layer is formed between the opaque base material and the synthetic resin layer and the synthetic resin layer is bonded to the material to be bonded by means of the adhesive layer, and the base material can be detached relatively easily, since it is stuck to the transparent layer of synthetic resin in a relatively weak way where the intermediate release layer is formed, while the layer of synthetic resin is kept stuck to the material to be bonded relatively strongly by the adhesion of the adhesive layer even after detachment of the base material.

According to the present invention, the layer of synthetic resin is bonded to the material to be bonded by means of the adhesive layer in a relatively strong manner, while the base material is bonded to the layer of synthetic resin by means of the intermediate layer of detachment in a relatively weak way and is bonded to the material to be bonded in an even weaker manner, whereby the base material can be detached from the material to be bonded, i.e. the layer synthetic resin formed on top. After the base material has been detached from the material to be bonded, the secret information present on the main surface of the material to be bonded can be seen through the transparent part of the synthetic resin layer.

In addition, by applying the temporarily adhesive material without treatment of the material to be bonded, a laminate can be obtained, which can be divided to form the base material slightly bonded to the material to be bonded and the layer of synthetic resin completely bonded, and the The user need only carry out a simple mashing operation which makes this type of temporarily adhesive material widely applicable.

In addition, the temporarily adhesive material just needs to be processed in manufacturing and the material to be bonded does not need to be treated, so the manufacturing process as well as the user-side adhesion machine can be easily simplified.

The present invention will be clearly understood from the following description given in conjunction with the attached drawings in which:

Figure 1 is a sectional view of a temporarily adhesive material as an embodiment of the present invention;

Figure 2 is a sectional view of an application of the previous embodiment;

Figure 3 is an illustration of an example of the manufacturing method of the embodiment shown in Figure 1;

Figure 4 is a perspective view of a postcard used in the previous embodiment;

Figure 5 is a perspective view of the state in which the base material of the embodiment shown in Figure 4 is detached;

FIGS. 6A and 6B are views of a variant of the embodiment mentioned above, la.figure 6A being a sectional view and FIG. 6B vine seen in perspective partially in puncture;

Figures 7 and 8 are views showing an example of the manufacturing method of the embodiment shown in Figure 6;

Figure 9 is a partially plan view of a separate embodiment of the invention;

FIG. 10 is a partially plan view of a variant of the embodiment of FIG. 9.

In the drawings, Figure 1 is a sectional view of a temporarily adhesive material according to the present invention. Figure 2 is a sectional view of an application of the previous embodiment.

The temporarily adhesive material 10 comprises a base material 12 made of an opaque material.

The base material 12 is made of a relatively soft material, such as paper or a film of synthetic resin. This material, which must be opaque and present a possibility of concealment, must have a covering power by its opacity, for example, by printing it with silver ink or the like so as to form a concealment layer or by laminating with a film or foil having a concealability such as aluminum foil by use of an adhesive or the like.

On the main surface of the base material 12, an intermediate release layer 14 is formed by printing or applying a wax.

As the wax constituting the intermediate detachment layer 14, any of the animal, vegetable, mineral and petroleum-derived waxes, for example natural waxes such as paraffin wax, microcrystalline wax or petrolatum wax, can be used. In addition, it is also possible to use, inter alia, Fischer Tropah wax and its derivatives, synthetic hydrocarbons such as low molecular weight polyethylene and its derivatives, modified waxes such as mineral wax derivatives, derivatives of paraffin wax and microcrystalline wax derivatives, aliphatic alcohols and acids such as cetyl alcohol and stearic acid, fatty acid esters such as glyceryl stearate and polyethylene glycol stearate, hydrogenated waxes such as glyceride, beaver wax and opal wax, synthetic amides of ketone amine, and in addition chlorinated hydrocarbons, synthetic animal waxes, synthetic waxes such as alpha-olefin wax. It is also possible to use mixtures of waxes containing any of the waxes mentioned above.

On the main surface of the intermediate release layer 14, a layer 16 of transparent synthetic resin is formed at least in part.

This layer 16 is formed by laminating a film or sheet of synthetic resin on the base material 12 using the adhesion of the layer 14 or by printing or applying a synthetic resin dissolved in a solvent or dispersed in water.

On the main surface of the layer 16 of synthetic resin, an adhesive layer 18 is formed by printing or applying an adhesive of the self-adhesive type. In this embodiment, the adhesive layer 18 is made transparent over the entire surface of the part corresponding to the transparent part of the layer 16.

On the main surface of this adhesive layer 18, a release sheet 20 is temporarily glued which plays the role of continuously supporting the temporarily adhesive material 10 which is divided into a multitude of parts, while covering and protecting the adhesive layer 18.

Consequently, the temporarily adhesive material 10 formed from the base material 12, the intermediate release layer 14, the layer 16 of transparent synthetic resin and the adhesive layer 18 are continuously formed at a prescribed distance on the sheet. release 20 and are made so that they can be easily detached from the sheet 20 under the effect of the release agent layer formed on the main surface of this sheet.

As the synthetic resin used to form layer 16, any of the following compounds can be used: polyethylene, copolymerized ethylene-ethyl acrylate resin, copolymerized ethylene-acrylic acid resin, copolymerized resin d ethylene methyl acrylate, the copolymerized resin of ethylene methyl methacrylate, the copolymerized resin of ethylene-methacrylic acid, the ionomer resin, the polymethylpentene resin, the copolymerized resin of ethylene vinyl alcohol, vinylidene chloride resin, copolymerized vinyl chloride-vinyl acetate resin, polyamide resin, copolymerized stylene-acrylic acid resin, polystylene resin, copolymerized polyacrylic acid resin, polyester resin , polyurethane resin. When printing and coating, the chosen synthetic resin can be dissolved in a suitable solvent or dispersed in water.

The process for manufacturing the temporarily adhesive material will now be described, mainly in connection with FIG. 3.

First, a piece of paper is prepared as the base material 12 and, if the paper's hiding power is insufficient, either its main surface is printed with silver ink by a known printing process such as offset printing, or it is coated to form a covering layer. Alternatively, for the formation of this concealment layer, an aluminum foil can be glued to the main surface of the paper using, for example, an adhesive of the self-adhesive type and this laminated foil foil can be used. aluminum as base material 12.

Furthermore, a laminate 22 must be prepared by laminating the synthetic resin film or sheet used to form the layer 16 of synthetic resin on the surface of a laminate with an adhesive layer 18 pre-formed on its top by applying a self-adhesive type adhesive on the main surface of a release sheet 20 coated with a release agent.

This laminate 22 is mounted in the form of a coil on the support roller 32 of manufacturing equipment 30 for the temporarily adhesive material. Furthermore, the base material 12 is also in the form of a coil and it is mounted on the roller 34 supporting the same equipment 30.

Then, one end of the wound laminate 32 is extracted and introduced into the coating apparatus 36. The coating apparatus 36 serves to coat the surface of the layer 16 of synthetic resin with an intermediate release agent such as a wax 14a for the formation of the intermediate release layer, comprising two rollers 38a and 38b as well as a storage container 40 and used to apply by coating the heated and melted intermediate release agent 14a by means of the rollers 38a and 38b subjected to a rotational movement.

As the coating apparatus 36, there may be used a coating machine, such as an engraving roller coating device or roller coating device rotating in opposite directions as well as a well known printing machine such as a offset printing machine or screen printing machine.

Thus, the laminated sheet 26 covered with the intermediate release agent 14a is introduced into a rolling machine 42 for subsequent rolling with the base material 12 as shown in FIG. 3.

The laminating machine 42 is used to laminate a paper 12a to be used as base material 12 on the surface of the release agent 14a, disposed on the path of the laminate 22, and comprises a roller 34 to hold the base material 12 under roll shape.

One end of the paper 12a is extracted and introduced between a roller 44a and its opposite roller 44b.

Then, the laminate 22 coated with the release agent 14a is introduced between the rollers 44a and 44b; consequently, between the rollers 44a and 44b, the paper 12a is placed on the laminate 22 with the release agent 14a placed between them. Then, the laminated sheet 22 with the paper 12a intended to serve as the basic material l'2 is introduced into a cooling device 46 or a cooling roller (not shown).

The cooling device 46 serves to cool the release agent 14a applied between the laminate 2 2 'and the paper 12a.

In the cooling device 46, the release agent 14a is cooled and solidified to form the intermediate release layer 14.

As indicated previously, the laminated laminate with the base material 12 and the intermediate release layer 14 placed between them is introduced into a stamping assembly 48. The assembly 48 includes a die-cutting device and thanks to it, correct cuts are made in the base material 12, the layer 14, the layer 16 of synthetic resin and the adhesive layer X8. The assembly 48 could also be of the type having a border roller.

The laminated sheet 22 comprising the base material 12, etc., in which cuts have been made is divided as it passes over a roller 50 between useful parts and unnecessary parts and the unnecessary parts are wound around a roller 52 d 'removal of waste, while the adhesive material 10 (useful parts) temporarily glued to the release sheet 20 is wound on ur. roller 54. Instead of the stamping assembly 48 and the winding roller 54, a cutting assembly can be used as well. This assembly comprises a cutting blade for making cuts in the base material 12, the intermediate layer 14, the layer of synthetic resin 16 and the adhesive sheet 18 so as to divide the adhesive material 10 into a multitude of parts.

The temporarily adhesive material 10 is used in the following manner.

For example, as shown in Figure 4, in order to hide secret information such as a person's bank statement on the surface of the postcard, material A to be pasted such as the postcard is introduced in stages , and the temporarily adhesive material 10 is unwound. When the material 10 is longer than the material A to be bonded, the dimensions of the material 10 are adjusted by cutting it into the appropriate format. Then, the cut material 10 is bonded to an appropriate part of the material to be bonded, and is bonded by the adhesive power of the adhesive layer 18 by compressing the surface of the material A with a compression roller.

During compression and bonding, the layer 16 of synthetic resin is strongly bonded and the base material 12 is bonded weakly because of the presence of the intermediate layer 14. Consequently, as shown in FIG. 2, the recipient can detach easily the base material 12, and see the secret information via the transparent parts of the layer 16 of synthetic resin and of the adhesive layer 18. As examples of the base material 12, mention may be made of apart from that already indicated in the previous embodiment, synthetic paper, cellophane, polyethylene, polyester and the like films, or an aluminum foil, etc. but it is desirable to choose a relatively soft material otherwise the material 10 may come off accidentally despite the adhesion of the intermediate layer 14.

When the base material 12 has been chosen which is excellent in terms of concealment, such as aluminum foil, it is possible to avoid the formation of a concealment layer identical to that of the previous embodiment.

Although in the above-mentioned embodiment, continuous paper has been chosen in the form of a roll to constitute the base material 12, this may be in the form of a sheet.

The surface of the base material 12 can be printed in a mode suitable for the material A to be bonded, and when the base material 12, the intermediate layer 14 and the layer 16 of synthetic resin are formed to be continuous, marks allowing the control of the pitch for introducing the base material 12, such as black arrows, can be printed as shown in FIG. 4.

Figures 6A and 6B are views of a temporarily adhesive material as an alternative to the above-mentioned embodiment.

As shown in FIG. 6A, the temporarily adhesive material 60 comprises a base material 62, an intermediate release layer 64, a transparent layer 66 of synthetic resin, an adhesive layer 68 and a release sheet 70.

In this material 60, part of the layer 66 is bonded by points directly to the base material 62, as shown in FIG. 6B.

Therefore, in the case where there is no formation of the intermediate layer 64, the base material 62 is bonded to the layer 66 of synthetic resin in a relatively strong manner so that there is little risk that the material 62 is not accidentally detached from the layer 66 even if the intermediate layer 64 is present.

The process for manufacturing the material 60 illustrated in FIG. 6A and in FIG. 6B will now be described mainly in connection with FIGS. 7 and 8.

FIG. 7 is an illustration of an example of manufacturing equipment for a laminate 72 obtained by laminating the base material 62, the intermediate release layer 64 and the layer 66 of synthetic resin. The manufacturing equipment 80 which is illustrated for this laminate 72 comprises a roller 82 for holding the base material 62 in the form of a strip in the form of a strip. The base material 62 held by the roller 82 at its end which is extracted and introduced into a coating assembly 84 with an intermediate release agent. The assembly 84 is used to print or apply to the surface of the base material 62 a release agent 64a such as a wax and contains two rollers 86a and 86b. Agent 64a is applied with roller 86a. Therefore, when the rollers 86a and 86b are rotated, the surface of the base material 62 therebetween is printed or coated with the agent 64a with the exception of dots.

As the coating assembly 84, it is also possible to use a coating machine of another type or a known printing machine, such as an offset printing machine or a screen printing machine.

The base material 62 coated with the release agent 64a is then introduced into a drying assembly 88 in order to solidify the agent 64a.

The laminate with the agent 64a solidified on its surface in the drying assembly 88 is then introduced into a set 90 of synthetic resin coating for the formation on its top of a layer 66 of transparent synthetic resin.

In this assembly 90, the surface of the intermediate detachment layer 64 of an appropriate thickness formed by the solidification of the agent 6-4a is printed or coated with an agent 66a of synthetic resin to form on its top a layer of resin synthetic 66.

The laminate 72 coated with the agent 66a in this coating assembly is wound in the form of a roll after the agent 66a has solidified.

The laminated sheet 72 wound in a roll is then, as shown in FIG. 8, loaded into a laminating assembly 94 for the formation of an adhesive layer 68.

In this laminating assembly 94, a release sheet 70 is loaded in the form of a roll, one end of which is extracted and introduced into a coating assembly 96 with an adhesive so that the surface of the release sheet 70 'is coated an adhesive 68a such as an adhesive of the self-adhesive type. The assembly 96 comprises two rollers 98a and 98b.

The roll 98b has its lower part held immersed in the adhesive 68a in the lower part of a container 98c. Therefore, upon rotation of the rollers 98a and 98b, the surface of the release sheet 70 is coated with the adhesive 68a. As coating assembly 96, it is also possible to use a coating machine of another type or a printing machine of a known type such as an offset printing machine or a screen printing machine.

The release sheet 70 thus coated with the adhesive 6a is then introduced into a drying assembly 100 comprising, for example, a heating element.

In the drying assembly 100, the adhesive 68a applied by coating to the surface of the release sheet 70 is dried so as to form the adhesive layer 68. The sheet 70 with the adhesive layer 68 formed on its top is introduced into a rolling assembly 102.

Meanwhile, the laminate 72 is maintained in the form of a coil on a separate roller 104 from which one end is extracted and this end is introduced into the rolling assembly 102. The rolling assembly 102 comprises two rollers 106a and 106b. Between the two rollers 106a and 106b, the laminate consisting of the release sheet 70 and the adhesive layer 68- is conveyed at the same time as the laminate 72 so that the layer 66 of synthetic resin is glued and laminated on the adhesive layer 68. When the rollers 106a and 106b are rotated, the laminate and the layer 68, etc. and the layer 66 of synthetic resin are bonded together and the adhesive material 60 is thus formed.

The adhesive material 60 thus formed is wound on a winding roll 110 to be stored in the form of a roll.

If necessary ·, · the roll can be unrolled and stamped in the desired shape as described above.

In each embodiment, cutouts can be formed along the edges of the base material. When the cutouts are formed in this way, the central part of the temporarily adhesive material comes off easily. In this case, as shown in FIG. 9, when each cut consists of a linear part and a curvilinear part, respectively, so as to overlap a part of a cut 224 and a part of the following cut 224 in the direction of detachment of the material 210, the central part of this material can be easily detached. In addition, to easily detach the central portion of the temporarily adhesive material, as shown in Figure 10, for example, linear cutouts 324 are formed along the edges of the base material 312 on a slope so as to overlap a portion of a cutout 324 and part of the cutouts 324 in the direction of detachment of the temporarily adhesive material 310.

The present invention is not limited to the exemplary embodiments which have just been described, it is on the contrary liable to modifications and variants which will appear to those skilled in the art.

Claims (9)

1 - Temporarily adhesive material (10), characterized in that it comprises: - a de.base material (12) opaque at least in part; - an intermediate release layer (14) formed on the main surface of the base material; - a layer of synthetic resin (16) formed on the main surface of the intermediate release layer, transparent at least in part; and - an adhesive layer (18) formed on the main surface of the synthetic resin layer, transparent in the part corresponding to the transparent part of the synthetic resin layer. 2 - Material according to claim 1, characterized in that the base material (12) comprises a concealment layer formed on the main surface of the side on which the intermediate release layer is formed. 3 - Material according to claim 1, characterized in that the intermediate release layer (14) is formed by printing or coating with a 'wax. 4 - A method of manufacturing a temporarily adhesive material, characterized in that it comprises: - a step of preparing a base material (12) opaque at least in part; - a step of preparing a synthetic resin film or sheet to form a synthetic resin layer (16) at least partially transparent; - A step of forming on a main surface of the synthetic film or sheet an adhesive layer (18) transparent in the part corresponding to the transparent part of the synthetic film or sheet; a printing or coating step with an intermediate release agent at least on the main surface of the base material or of the synthetic resin film or sheet; and - a step of forming an intermediate release layer (14) between the base material and the film or sheet of synthetic resin by laminating this film or sheet on the base material using the intermediate release agent. 5 - The manufacturing method according to claim 4, characterized in that it comprises a step of preparing the base material with a concealment layer formed on its main surface. 6 - The manufacturing method according to claim 4, characterized in that the intermediate release agent is a wax. 7 - A method of manufacturing a temporarily adhesive material, characterized in that it corrects: - a step of preparing a partially opaque base material; a step of forming an intermediate release layer by printing or coating with an intermediate release agent from the main surface of the base material; - A step of forming a transparent synthetic resin layer at least in part by printing or coating with a synthetic resin of the main surface of the intermediate layer; and a step of forming an adhesive layer on the surface of the synthetic resin layer, the adhesive layer being transparent in the part corresponding to the transparent part of the synthetic resin layer. 8 - A manufacturing method according to claim 7, characterized in that it comprises a step of preparing the base material with a concealment layer formed on its main surface. 9 - The manufacturing method according to claim 7, characterized in that the intermediate release agent is a wax. ï