阅读说明：本技术 密封剂层组件 (Sealant layer assembly ) 是由 G·培祖罗 弗朗西斯科·波蒂 于 2019-10-14 设计创作，主要内容包括：一种密封剂层组件,其允许在轮胎制造工厂以外将密封剂层施加在轮胎上。该组件包括：要施加在内衬层的面向轮胎的内腔的表面上的密封剂层,设置在密封剂层的第一表面上的网层,和设置在密封剂层的与第一表面相对的第二表面上或设置在网层上的至少一个非粘性保护层。(A sealant layer assembly that allows for the application of a sealant layer on a tire outside of the tire manufacturing plant. The assembly includes: the tire comprises a sealant layer to be applied on the surface of the innerliner layer facing the inner cavity of the tire, a mesh layer disposed on a first surface of the sealant layer, and at least one non-adhesive protective layer disposed on a second surface of the sealant layer opposite the first surface or disposed on the mesh layer.)

1. A sealant layer assembly that allows for the application of a sealant layer over the interior cavity of a tire outside of the tire manufacturing plant; the assembly comprises: (i) a sealant layer applied with its first surface on the surface of the inner liner facing the inner cavity of the tire and consisting of a rubber layer having a viscosity such as to create a transient "seal" or close off the hole left by the object around the object piercing the tread, (ii) a mesh layer disposed on said first surface of the sealant layer, said mesh layer being interposed in use between the sealant layer and the surface of the inner liner facing the inner cavity of the tire, and (iii) a non-adhesive protective layer disposed on said mesh layer; the mesh layer has meshes, and the area of each mesh is 0.25mm²～25mm²。

2. The assembly of claim 1, comprising a second non-adhesive protective layer disposed on a second surface of the sealant layer.

3. Assembly according to any one of the preceding claims, characterized in that the web layers are made of synthetic or natural polymer material.

4. The assembly of claim 1, wherein the mesh layer is formed from a material selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, nylon, and combinations thereof,And rayon.

5. The assembly of any preceding claim, wherein the sealant layer has a thickness in the range of 2 to 5 mm.

6. Assembly according to any one of the preceding claims, characterized in that the non-stick protective layer is a single-sided silicone paper.

7. Assembly according to any one of the preceding claims, characterized in that the non-adhesive protective layer is made of a material selected in the group consisting of paper, metal film and plastic film, on which material a surface treatment has been carried out; the surface treatment is performed by a material selected in the group consisting of silicon, paraffin, fluoropolymer, polyethylene.

8. A method of manufacturing an assembly according to any one of the preceding claims, comprising a first coupling step in which the web layer and the non-adhesive protective layer are coupled to each other, and a subsequent second coupling step in which a sealant layer is applied to the web layer already coupled to the non-adhesive protective paper; the second coupling step is carried out at a temperature in the range of 60 to 110 ℃.

9. The method of claim 8, wherein after the second coupling step, the temperature is rapidly reduced to less than 10 ℃.

10. The method of claim 8, wherein after the second coupling step, the temperature is rapidly reduced to less than 0 ℃.

Disclosure of Invention

The present invention relates to a sealant layer assembly to allow the application of a sealant layer outside of a tire production line. In this way, the sealant layer can be applied at the tire distributor and also on any type of tire requested by the customer, and is therefore not subject to production restrictions.

The use of an adhesive sealant layer, typically disposed within the interior cavity of a tire, has been known for a long time in the tire manufacturing industry. In particular, the sealant layer is disposed in contact with the inner liner layer in the area of the tread band.

The sealant layer functions to create a transient "seal" around the object piercing the tread, thereby preventing air from escaping the tire. Furthermore, in the presence of the aforementioned object, the material of the sealant layer has the function of filling the hole left by the object and thus of sealing it.

The viscosity of the sealant layer is one of the most important parameters that allow it to perform effectively the above task. In fact, the viscosity of the sealant layer must ensure both the sealing action, as described above, in a very short time against the objects that pierce the tread and the holes left by the objects themselves, and the dimensional stability thereof in the internal cavity of the tyre during the rolling or resting phase of the tyre. The sealant layer is particularly viscous and has a low viscosity due to its function, and for this reason, it is difficult to handle when separating it from the tire. This is why sealant layers are usually applied directly to the surface of the innerliner on the tire production line. For the reasons mentioned above, limited line-up (limited line-up) products are available on the market for end users to apply sealant layers. Furthermore, the bond formed between the sealant layer and the innerliner makes it difficult to remove the sealant layer from the tire at the end of the life of the sealant layer itself.

Therefore, there is a need to find a solution that allows a tire dealer or end user to apply a sealant layer to a tire, regardless of the make and model selected.

By doing so, the end user can ensure that sealant layers will be available in any tire of their choice, and thus not be limited by the choice made by the manufacturer.

The subject of the invention is a sealant layer assembly allowing a sealant layer to be applied on the inner cavity of a tyre outside the tyre manufacturing plant; the assembly comprises: (i) a sealant layer applied with its first surface on the surface of the inner liner facing the inner cavity of the tire and consisting of a rubber layer having a viscosity such as to create a transient "seal" or close off the hole left by the object around the object piercing the tread, (ii) a mesh layer disposed on said first surface of the sealant layer, said mesh layer being interposed in use between the sealant layer and the surface of the inner liner facing the inner cavity of the tire, and (iii) a non-adhesive protective layer disposed on said mesh layer; the mesh layer has meshes, and the area of each mesh is 0.25mm²～25mm²。

Experiments have shown that this mesh area range allows both an effective sealing action of the sealant layer and an effective removal action of the sealant layer by pulling apart the mesh layers.

In the following, sealant layer means a layer of rubber intended to be disposed on the surface of the inner liner facing the inner cavity and having a viscosity such as to create an instantaneous "seal" around the object piercing the tread, preventing the air from flowing out of the tire or closing the hole left by this object.

Preferably, the assembly includes a second non-adhesive protective layer disposed on the second surface of the sealant layer.

Preferably, the mesh layer is made of a synthetic or natural polymer material.

Preferably, the mesh layer is made of a material including polyethylene, polypropylene, polyethylene terephthalate, nylon, polyethylene terephthalate,And rayon.

Preferably, the thickness of the sealant layer ranges from 2 mm to 5 mm.

Preferably, the non-adhesive protective layer is a single-sided silicone paper.

Preferably, the protective layer is made of a material selected from the group consisting of paper, a metal film and a plastic film, on which a surface treatment has been performed; the surface treatment is performed by a material selected in the group consisting of silicon, paraffin, fluoropolymer, polyethylene.

Detailed Description

Some illustrative non-limiting examples follow.

Compounds were prepared to make sealant layers with phr compositions as shown in table I.

TABLE I

Halogenated butyl rubber	100.0
		Carbon black	40.0
Plasticizer	240.00
		Sulfur	0.5
Stearic acid	1.5
		Zinc oxide	1.0
Accelerator	4.0

The halogenated butyl rubber is brominated butyl rubber.

The type of carbon black used is identified as N550.

The plasticizer used was naphthenic oil.

The accelerator used was dibenzothiazyl disulfide (MBTS).

The ingredients shown in table I were mixed with each other and stirred at a temperature of 100 ℃ for 10 minutes.

The manufacturing process comprises the following steps:

according to one non-limiting embodiment, the assembly manufacturing process includes a first coupling step of coupling the web layer and the non-adhesive protective paper to each other, and a subsequent second coupling step during which a sealant layer is applied to the web layer that has been coupled to the non-adhesive protective paper. The process was carried out at a temperature of 85 ℃. Preferably, the process must be carried out at a temperature in the range of 60 to 110 ℃.

To avoid shape changes of the sealant material layer (elastic shrinkage or viscous flow phenomena), the temperature was rapidly lowered to-5 ℃. Preferably, in this step, the temperature is reduced to below 10 ℃, more preferably below 0 ℃, so as to approach the Tg of the sealant material.

In the examples described herein, the mesh layer used was made of polypropylene, the mesh of which had an area of 9mm²A diamond shape.

In the embodiments described herein, the non-adhesive protective layer is a single-sided silicone paper having a basis weight of 135g, manufactured by "Rossella s.r.l.

After having been manufactured as described above, the assembly is wound to form a roll and then stored.

If the manufacturer wants to manufacture and store the assembly in the form of an already packaged strip of predetermined length, an additional non-adhesive protective layer has to be applied on the surface of the sealant layer opposite to the surface where the web layer is applied.

An application process:

the assembly according to the invention is then applied on the tyre according to the procedure described below:

strips of appropriate size are cut from the cryopreserved assembly. The strip is heated until it reaches a temperature in the range 40 ℃ to 80 ℃ (preferably 50 ℃). Preferably, the heating is obtained by means of IR radiation (set at 1000W at a distance of 1m for 20 minutes) in order to obtain heating of only the surface, or by means of oven heating at 50 ℃ for 10 minutes.

After the material has been heated, the non-adhesive protective layer underneath the mesh layer must be removed and a strip of material must be applied to the liner at the desired location (the mesh layer placed in contact with the liner), applying pressure to ensure adhesion. At this time, the protective layer (if present) disposed on the sealant layer is also removed. At the end of the sealant layer application process, the tire is fitted on the rim and inflated to the operating pressure.

The mesh layer may be more easily removed because it does not adhere to the inner liner or adheres to the inner liner to a lesser extent than the sealant layer, and by pulling it away from the inner liner, ensures easier removal of the sealant layer. Therefore, when handling the tire, it is sufficient to make a cut in the sealant layer, exposing the ply, and thus removing it together with the sealant layer.