JPH0673195U - Papermaking dryer canvas joint - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a good joint on a canvas with a smooth surface and low air permeability. [Composition] In a canvas composed of a 3/2 twill weave having a main structure of 6 warps and a unit of woven structure, a joint structure at the end of the canvas has a pattern of 1 unit of 12 warps and is repeated over the entire width direction. The pattern of one unit of the joint structure is formed by three joining loops and three endmost weft binding loops, and the same pattern is repeated in the entire width direction of the end portion on the other side. The joint structure of is arranged such that when the canvas ends are butted, the joining loop portion at one end faces the outermost weft binding loop portion at the other end,
A joint part of a paper dryer canvas in which the intervals between adjacent joining loops are equal when the core wire is inserted. [Effect] The surface is smooth, and the canvas main structure has sufficient joint strength like the joint part of the woven structure that forms one unit with four warp threads, and the joining loops are evenly spaced when the core wire is inserted. Since there is no dry spot, no mark is formed on the wet paper, and a long-lasting joint is obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint portion of a dryer canvas for papermaking.

[0002]

[Prior art]

 Dryer for papermaking that folds back the extended warp of the canvas body to form a loop for joining.The joint part of the canvas is an endless paper dryer by inserting the core wires by engaging the joining loops formed at both ends. Get the canvas.

Such a conventional joint has an advantage that when the core wire is inserted to form an endless shape, the longitudinal gaps at the joint can be made uniform.

Generally, a dryer canvas which is stretched on a paper machine is stretched with a tension of 1 to 2 kg / cm, and in order to run at a speed of several hundreds to one thousand hundreds of m / min during traveling. The joint strength needs to be set to 60 kg / cm or more.

A dryer canvas (hereinafter referred to as a canvas), which has a conventional standard design and has one unit woven structure with four warp yarns, has a number of splicing loops of 6, for example, when the warp yarn density is 70 yarns / inch. The joint strength is 89 pieces / cm, and the joint strength when polyethylene terephthalate with a wire diameter of 0.45 mmΦ is used is about 80 kg / cm, which is sufficient for canvas running.

[0006]

[Problems to be solved by the device]

 However, in order to make the surface smooth and to obtain low air permeability, a canvas made of 3/2 twill weaving one unit with 6 warps has a number of loops for joining when the warp density is 70 threads / inch. It was 4.59 pieces / cm, and the joint strength when polyethylene terephthalate with a wire diameter of 0.45 mmΦ was used was about 55 Kg / cm, which did not clear the setting target of setting 60 Kg / cm or more. There is a risk of breakage during use.

Further, in this case, as shown in FIG. 3, the intervals between the joining loops adjacent to each other at the time of inserting the core wire are not equal, and there are a part having a wide interval like W _{1 and} a part having a narrow interval like W _2. In addition, W ₁ and W ₂ have different air permeability, resulting in dry spots, resulting in joint marks on the wet paper, and the joining loops in the widely spaced parts slidingly contacting in the direction of the core and causing wear. Therefore, there is an inconvenience such as easy breakage.

Further, if two joining loops out of the six warp threads are made to increase the joint strength, even if it is possible to make them, this time, the joining loops are mutually joined at the time of butting both ends of the canvas. Even if they try to engage with each other, they do not engage with each other, which is inconvenient.

The present invention is provided for the purpose of improving such inconvenience.

[0010]

[Means for Solving the Problems]

 In the present invention, the joint structure is a woven structure that forms one unit with 12 warps, and the strength of the joint is increased by creating three joint loops in the joint structure. Moreover, when the core wire is inserted, the adjacent joint loops are The inconvenience was solved by devising so that the intervals are even.

That is, in a canvas composed of a 3/2 twill weave having a main structure of 6 warps and a unit of woven structure, the joint structure at the end of the canvas has a pattern of 1 unit of 12 warps, The pattern of one unit is composed of three joining loops and three outermost weft binding loops, and the joint weave of the above pattern is repeatedly provided over the entire width direction, and the other end of the canvas body is over the entire width direction. Also, a joint structure that forms a unit pattern with 12 similar warp yarns is repeatedly provided over the entire width direction, and the mutual joint structures are canvases. When both ends are butted, one canvas end has a joining loop part with the other canvas. The outermost weft-stitching loop part at the end is In the dryer canvas for papermaking, the joining loop portions are arranged at positions facing each other, and when endlessly joined by inserting the core wire, the intervals between the adjacent joining loops are equal. It is a joint part.

[0012]

[Action]

 A canvas composed of a 3/2 twill weave consisting of 6 warp threads as one unit has a smoother surface than a canvas with 4 warp threads as one unit, and a joint design with 12 warp threads as 1 unit. A canvas in the form of a unit, in which one unit pattern is composed of three joining loops and three endmost weft binding loops, and this joint structure is repeatedly provided over the entire width direction, for example, has a warp density. When the number is 70 / inch, the number of joining loops is 6.89 / cm, and when polyethylene terephthalate with a wire diameter of 0.45 mmΦ is used, the joint strength is about 80 kg / cm and the joint strength is 60 kg. Setting of / cm or more The target will be cleared.

Further, the joint structures at both ends of the canvas can be meshed with each other, and since the joining loops adjacent to each other are evenly spaced at the time of inserting the core wire, dry spots do not occur, and each joining loop extends in the core wire direction. Do not slide.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a dryer canvas at both ends butting before inserting the core wire of the embodiment, and FIG. 2 is a view of joining the joint portion after inserting the core wire of the embodiment. It is a top view showing a state.

[Embodiment] FIG. 1 shows a joint structure C in a canvas composed of a 3/2 twill weave having a main structure of 6 warps and a unit structure of 1 unit.₁ ~ C₆ Warp A₁ ~ A₁₂12 units of 1 form the pattern of 1 unit, and the pattern of 1 unit of joint structure is 3 loops for joining C₁ , C₂ , C_Five And the three outermost weft binding loops C₃ , C_Four , C ₆ And the joint structure of the above pattern is repeatedly provided over the entire width direction, and a joint structure D having one unit pattern with the same warp yarns 12 is formed over the entire width direction end of the other side of the canvas body.₁ ~ D₆ Are repeatedly provided over the entire width direction, and when the joint structures of the two canvases are butted against each other, the joining loop part of one canvas end part is the outermost weft yarn of the other canvas end part, and the binding loop part is the outermost weft part. In the binding loop portion, the joining loop portions of the other canvas end portion are arranged so as to face each other, and at the time of endless joining by inserting the core wire E, the intervals between adjacent joining loops are equal. It is a joint part of a paper making dryer canvas.

More specifically, the joint structure C _{1 to} C ₆ has ₁₂ warp threads A _{1 to} A ₁₂ as one unit, and the odd number of warp threads A ₁ , A ₃ , ..., A ₁₁ is an odd number. The subscript numbers are extended warp yarns, which are folded back to form three joining loops C ₁ , C ₂ , C ₅ and three endmost weft binding loops C ₃ , C ₄ , C ₆ , while A ₂ , A 5 ₄ , ..., A part of the warp tip portion of the A even subscript number part of A ₁₂ is previously set as the odd number subscript binding part of the extracted warp yarn A.

Two of the warp yarns A₁ , A₃ , And one warp A₉ 3 joint loops C₁ , C₂ , C_Five And the other three warp yarns A_Five , A₇ And A ₁₁ Fold back to the canvas body side with the endmost weft B and the three endmost weft binding loops C₃ , C_Four , C₆ On the other end side of the canvas body side.₃ , D_Four , D₆ Forms a joining loop, D₁ , D₂ , D_Five Are configured to form the endmost weft binding loop.

The pattern of one unit of the joint structure is two joining loops C ₁ and C ₂ , two endmost weft binding loops C ₃ and C ₄ next to it, and one joining loop C ₅ next to it. , Next to it, one outermost weft binding loop C ₆ is arranged, and this pattern is repeatedly provided over the entire width direction of the end of the canvas body, and the entire width direction of the other end of the canvas body. The two outermost weft stitching loops D ₁ and D ₂ have the same pattern and mesh with each other at one end, and the two joining loops D ₃ and D ₄ are next to it. The end weft binding loop D ₅ is a joint part of a paper dryer canvas in which one joining loop D ₆ is arranged next to the end weft binding loop D ₅ and this pattern is repeatedly provided over the entire width direction of the end portion of the canvas body.

In the case of the present embodiment, one pattern is started from C _1. However, regarding this one pattern, the start may be started from anywhere among C _{1 to} C ₆ , for example from C _3. merely be started one pattern becomes _{C 3, C 4, C 5} , C 6, C 1, C 2 of the cycle, only be formed as D ₁ to D ₆ are facing the same accompanying figures Is.

In any case, when the core wire is inserted to form an endless shape, the intervals between the adjoining joining loops become equal as shown in FIG.

[0021]

[Effect of device]

 As described above, the joint portion of the papermaking dryer canvas according to the present invention has sufficient joint strength as the joint portion of the woven structure in which the canvas main body structure is one unit with four warp yarns, and the joint structures at both ends of the canvas are Since they can be meshed with each other and the joining loops that are adjacent to each other are evenly spaced when the core wire is inserted, dry spots do not occur, and the joining loops are not slidably contacted in the core wire direction to cause wear. Therefore, there is an effect that the joining loop lasts a long time.

[Brief description of drawings]

FIG. 1 is a plan view at the time of abutting both ends of a dryer canvas before inserting a core wire according to an embodiment.

FIG. 2 is a plan view showing a joined state of the joint portion after inserting the core wire according to the embodiment.

FIG. 3 is a plan view showing a jointed state of the joint portion after the core wire is inserted when the joint structure constitutes one unit with six warp threads and one joint loop exists in the six warp threads.

[Explanation of symbols]

A _{1 to} A ₁₂ : warp, B ₁ : end weft, B ₂ : front weft,
B ₃ : back weft, C ₁ , C ₂ , C ₅ : joining loop, C
₃ , C ₄ , C ₆ : Endmost weft binding loop, D ₃ , D ₄ , D ₆
: Joining loop, D ₁ , D ₂ , D ₅ : End weft binding loop, E: Core wire.

Claims (1)

[Scope of utility model registration request] 1. A canvas composed of a 3/2 twill weave having a main structure of 6 warps and 1 unit weave, and the joint structure at the end of the canvas has a pattern of 1 unit of 12 warps, and a joint structure. The pattern of one unit is composed of three joining loops and three endmost weft binding loops, and the joint structure of the above pattern is repeatedly provided over the entire width direction, and the other end portion of the canvas body across the entire width direction. In the same way, a joint structure which forms a unit pattern with 12 similar warp threads is repeatedly provided over the entire width direction, and when the mutual joint structures are butted at both ends of the canvas, the joining loop portion of one canvas end is joined to the other canvas end. Part of the outermost weft binding loop part, the other end of the weft binding loop part is the joining loop of the other canvas end part A joint portion of a papermaking dryer canvas, wherein the portions are arranged at positions facing each other, and at the time of endless joining by inserting the core wire, intervals between adjacent joining loops are equal.