JP2000301546A - Winding liner for lengthy raw rubber member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably hold a raw rubber member, to smoothly release the member when unwound and to provide an excellent durability exhibiting a good operability by forming a surface of a sheet-like synthetic resin to become a base material in a specific surface roughness, and then covering the surface with a high molecular weight polymer having a specific thickness. SOLUTION: The liner 1 is covered on both surfaces of a base material 2 of a sheet-like polyester resin having a surface roughness of 0.05 to 1.0 μm with covering members 3 of low density polyethylene of a high molecular weight polymer having a thickness of 1 to 5 μm. The member 3 forms a suitably smoothened embossed surface shape and has suitable adhesive properties and suitable mold release ability with physical properties of the polyethylene. In the case of the high rigidity liner 1, when released from a tread rubber, the liner 1 is smoothly released without deforming due to dragging. Thus, the high rigidity polyacrylic polymer is used for the material 2, the member is smoothly release without increasing in thickness the liner 1, and operability and durability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liner for winding a long plastically deformed raw rubber member which is superposed and interposed to prevent adhesion of the raw rubber when the raw rubber member is wound.

[0002]

2. Description of the Related Art A long plastic deformation supplied from an extruder or a calender roll for storing unvulcanized raw rubber such as a tread, a belt, a ply, and an inner liner which are tire constituent members of a tire top and a sidewall. The raw rubber member may be wound up and stored.

At this time, since the raw rubber has adhesiveness, if the raw rubber is wound as it is, the wound raw rubber adheres to each other, and the raw rubber member may be deformed at the time of unwinding. Therefore, a method is generally adopted in which a liner is interposed between the long raw rubber members to be wound to prevent adhesion of the raw rubber.

The long raw rubber member wound up and stored with a liner interposed by the same method is unwound at the time of unwinding and the raw rubber member is taken out while peeling off the liner interposed between the members, and is used for tire assembly. Conventionally, as the liner used here, a synthetic fiber woven fabric is mainly used, but the use of a thin plate-shaped liner such as a synthetic resin has been increasing.

For example, Japanese Unexamined Utility Model Publication No. 3-47848 discloses a synthetic fiber woven fabric 02 having a relatively coarse weight as a core, as shown in FIG. This is a liner 01 in which the coated high molecular polymers 03, 03 on both sides are covered and bonded to each other via a crossing gap of a synthetic fabric woven fabric 02 with a coarse weight.

[0006]

In the synthetic fiber woven fabric 02, since the warp and the weft form an intersecting gap, when the raw rubber member is wound up and stored for a long time, the raw rubber member which is easily plastically deformed bites into the intersecting gap of the woven fabric. At the time of unwinding, the separation between the raw rubber member and the liner 01 is not clear, and the raw rubber member is deformed, or the shape of the crossing portion of the fabric is uneven on the surface of the raw rubber member.

In addition, since the air permeability is provided by the intersecting gap, a blooming phenomenon in which a rubber compound such as sulfur precipitates on the surface of the unvulcanized green rubber occurs, thereby reducing the adhesiveness of the raw rubber member.

Further, since the synthetic fiber woven fabric 02 is not high in rigidity, the deformed curl generated during storage is shown even after unwinding, and does not peel off smoothly from the raw rubber member, thereby hindering the assembly of the tire.

Therefore, in order to increase the rigidity, a high molecular weight polymer 03
It is also conceivable to coat thickly with
Between 3 and 03, air may be included together with the synthetic fiber fabric 02, and durability may be impaired.

[0010] The present invention has been made in view of the above points, and an object thereof is to provide a liner having a moderate adhesiveness to a raw rubber member to stably hold the raw rubber member,
An object of the present invention is to provide a liner for winding a long raw rubber member having excellent durability, which is smoothly peeled off from the raw rubber member at the time of unwinding and exhibits good workability.

[0011]

In order to achieve the above-mentioned object, the present invention provides a method for manufacturing a base material comprising a thin plate-shaped synthetic resin having a surface roughness of 0.05 to 1.0 μm on both or one side thereof. A liner for winding a long raw rubber member coated with a coating member of a high molecular polymer having a thickness of 1 to 5 μm.

The surface of the synthetic resin in the form of a thin plate as a base material is made to have a surface roughness of 0.05 to 1.0 μm, and 1 to 5 μm
By coating the covering member made of a polymer with a thickness of m, the covering member covers the surface roughness of the base material to form an appropriately smooth uneven surface shape. In combination with the properties, it is possible to provide appropriate adhesiveness to raw rubber and appropriate releasability.

Therefore, the winding liner can stably hold the raw rubber member by appropriate adhesiveness, and can smoothly peel off the raw rubber member by appropriate release property at the time of unwinding and exhibit good workability. And durability is also improved.

According to a second aspect of the present invention, in the liner for winding a long raw rubber member according to the first aspect, the base material is a polyester polymer having a thickness of 100 to 350 μm.

By using a polyester polymer having a thickness of 100 to 350 μm as a base material, the winding liner can be given an appropriate rigidity, and the release from the raw rubber member can be performed more smoothly during unwinding. be able to.

According to a third aspect of the present invention, in the liner for winding a long raw rubber member according to the first or second aspect, the covering member is a low-density polyethylene having a thickness of 1 to 3 μm. And

By using low-density polyethylene having a thickness of 1 to 3 μm as a covering member, it is possible to obtain appropriate adhesion to raw rubber, in combination with an appropriately smooth uneven surface shape and properties of low-density polyethylene. It can have an appropriate release property.

According to a fourth aspect of the present invention, in the liner for winding a long raw rubber member according to the first or second aspect, the covering member is a silicon-based polymer having a thickness of 1 to 3 μm. Features.

By using a silicone polymer having a thickness of 1 to 3 μm as a covering member, an appropriate smoothness of the uneven surface shape and the properties of the silicone polymer are combined with the appropriate adhesion to the raw rubber. It is more suitable for a raw rubber member with high adhesiveness, while further improving the releasability while maintaining the property.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described with reference to FIG. The liner 1 according to the present embodiment has a thin plate shape having a thickness of 100 to 350 μm and has a surface roughness of 0.6 to 0.7 μm. The coating members 3 are coated to a thickness of 1 to 3 μm.

The low-density polyethylene covers both sides of the polyester resin having a surface roughness of 0.6 to 0.7 μm with a thickness of 1 to 3 μm. An uneven surface shape with a smooth surface is formed, and together with the properties of the low-density polyethylene, it can be provided with an appropriate adhesiveness to raw rubber and an appropriate release property.

The release index of the liner 1 was 45. The smaller the value of the peeling index, the easier the peeling is, and the peeling force of the smooth polyester resin is shown as 100 based on the peeling force measured as follows.

As shown in FIG. 2, a low-clay NR / SBR / carbon black compound tread rubber 5 for a passenger car is superimposed on the liner 1 to be tested, and a load of 0.4 kg / cm ² is applied to the liner 1 to obtain an atmosphere at 40 ° C. After being left for 24 hours in the inside, the liner 1 and the tread rubber 5 are placed on the roller conveyor on which the free rolls 6 are arranged as shown in FIG. The tensile force at the time of pulling down from the tread rubber 5 and separating from the tread rubber 5 is defined as the peeling force.

As the substrate, polyester, polyolefin, polyvinyl, polyamide, polyurethane and polyacrylic polymers can be used. Among them, polyester polymers have the highest rigidity and are suitable without being too thick. It is the most excellent as a base material requiring high rigidity.

As shown in FIG. 3, in the case of the liner 1 having high rigidity, when the liner 1 is peeled off from the tread rubber 5, the liner 1 is smoothly pulled off by the tread rubber 5 without being substantially deformed. On the other hand, as shown in FIG. 3, in the case of the low-rigidity liner 1 ', the liner 1' is dragged by the tread rubber 5 and easily deformed, so that peeling is not performed smoothly. In the worst case, the liner 1 is conveyed together with the tread rubber 5. .

Therefore, by using a highly rigid polyacrylic polymer as the base material 2, the raw rubber member can be smoothly separated without increasing the thickness of the liner 1.
The winding liner 1 is capable of stably holding the tread rubber 5 with an appropriate adhesiveness, and showing good workability by smoothly peeling the tread rubber 5 with an appropriate release property at the time of unwinding. And durability is also improved.

The results of the measurement of the peel index for various liners are shown below.・ Smooth polyester resin liner: Peeling index 100 ・ 0.1 to 0.2 μm surface roughness Polyester resin liner: Peeling index 120 ・ 0.1 to 0.2 μm surface roughness polyester resin + Low density polyethylene coated liner: Peeling index 55 ・ 0.6 to 0.7 μm surface Roughness polyester resin liner: Peeling index 140 · 0.6 to 0.7 µm surface roughness polyester resin + Low density polyethylene coated liner: Peeling index 45 · 0.1 to 0.2 µm surface roughness polyester resin + Silicone polymer coated liner: Peeling index 10

From this result, when the surface roughness generally increases,
When the peelability is poor and low density polyethylene is coated,
It can be seen that the releasability is improved and the releasability is improved as the surface roughness is increased, and that the releasability is dramatically improved by coating with a silicon-based polymer.

When the winding device winds up the raw rubber member with the liner interposed therebetween, each surface of the raw rubber member comes into contact with each surface of the liner. Therefore FIG.
As shown in (1) and (2), the unified material of the liner 11 and the raw rubber member 15 which have been appropriately adhered from the winding portion is unwound, and the raw rubber member 15 and the liner 11 are peeled off at the roller downstream thereof. At this point, the outermost raw rubber member 15 is deformed by being dragged by the unwound liner 11,
If the degree of adhesion is large, unwinding may be hindered.

Therefore, it is possible to cope with the above-mentioned problem by using a liner having a different peeling force on each surface.
For example, the liner 21 shown in FIG. 5 has a thin plate shape having a thickness of 100 to 350 μm and has a surface roughness of 0.1
Polyester resin base material 22
Is covered with a low-density polyethylene covering member 23 made of a high molecular polymer to a thickness of 1 to 3 μm on only one side. The peel index is 55 on the surface of the covering member 23 and 100 on the surface of the base material 12.

The surface of the covering member 23 which is easily peeled is set to the back side,
If the raw rubber member is supported on the surface of the base material 22, the raw rubber member can be stably held, and when unwound from the winding device, the covering member 23 on the back surface of the liner 21 with good releasability can easily form the raw rubber member. And does not hinder unwinding.

A raw rubber member having a trapezoidal cross section, such as tread rubber, has a different contact area between the front surface and the back surface, and the back surface has a larger contact area and a larger peeling force.
Even if the both surfaces have the same peeling force as the liner 1 shown in FIG. 1, the liner 1 may contact and support the back surface of the tread rubber where the peeling force is large.

In the case where the peeling force of each surface of the liner is made different, in addition to the example shown in FIG. 5, the surface roughness of each surface of the base material 32 is changed as in the liner 31 shown in FIG. Alternatively, the covering members 33 of the same high molecular polymer may be covered to the same thickness.

The liner 31 is formed in a thin plate shape having a thickness of 100 to 350 μm and has a low density on both sides of a base material 32 having a surface roughness of 0.1 to 0.2 μm on one side and a surface roughness of 0.6 to 0.7 μm on the other side. The cover member 33 made of polyethylene is coated to a thickness of 1 to 3 μm. Therefore, one surface of the liner 31 has a peel index of 55, and the other surface has a peel index of 45.

If it is desired to form a surface having a lower peeling index, a silicone polymer may be used for the covering member. For example, the base material 32 of the liner 31 may have a silicon-based polymer having a surface roughness of 0.1 to 0.2 μm. If the coalescing is coated to a thickness of 1 to 3 μm, the surface of the liner coated with the silicon-based polymer can be set to a peeling index of 10 so as to be in a state of being very easily peeled.

As described above, changing the surface roughness of the base material,
By changing the type of high polymer of the covering member,
A liner having a surface having an appropriate peel index can be easily manufactured, and liners suitable for each of various raw rubber members can be prepared.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a liner according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a method of measuring a peeling force.

FIG. 3 is a schematic side view for explaining a state of peeling.

FIG. 4 is a side view showing a state where the liner is unwound from the winding device.

FIG. 5 is a cross-sectional view schematically showing a liner according to another embodiment.

FIG. 6 is a cross-sectional view schematically showing a liner according to another embodiment.

FIG. 7 is a view showing the structure of a conventional liner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liner, 2 ... Base material, 3 ... Coating member, 5 ... Tread rubber, 6 ... Free roll, 11 ... Liner, 15 ... Green rubber member, 21 ... Liner, 22 ... Base material, 23 ... Coating member, 31 ... Liner , 32 ... base material, 33 ... coating member.

Claims (4)

[Claims] Claims: 1. A substrate made of a synthetic resin in the form of a thin plate having a surface roughness of 0.05 to 1.0 μm, on both surfaces or one surface thereof.
A liner for winding a long raw rubber member, which is coated with a coating member made of a high molecular polymer with a thickness of 1 to 5 μm. 2. The liner according to claim 1, wherein the substrate is a polyester polymer having a thickness of 100 to 350 μm. 3. The liner for winding a long raw rubber member according to claim 1, wherein the covering member is a low-density polyethylene having a thickness of 1 to 3 μm. 4. The liner for winding a long raw rubber member according to claim 1, wherein the covering member is a silicon-based polymer having a thickness of 1 to 3 μm.