JPS6026160Y2 - Papermaking dryer-felt joint - Google Patents

Description

[Detailed description of the invention] The present invention relates to the joints of dryer felt for paper manufacturing, and provides a joint that does not impair the surface smoothness and elasticity of the felt and has excellent durability. It is something to do.

Normally, a dryer canvas for papermaking runs endlessly between a number of canvas rolls and the heating cylinders while pressing the wet paper against a number of heating cylinders in order to dry the paper.

Generally, the dryer canvas is wider than the wet paper, and the wet paper is pressed evenly over the entire surface.

Therefore, both ears of the dryer canvas and a slight width inside thereof were in direct contact with the heating cylinder without using wet paper, and the deterioration was more severe than in other parts.

In addition, the dryer canvas sometimes meandered due to the paper machine roll being out of parallel, or ran lopsided due to a failure of the guide device, which often resulted in damage to the ears or excessive load. .

Moreover, this phenomenon also occurs at photothermal canvas joints, so especially at joints where traction is applied, damage spreads from the edges to the center of the width, making it impossible to repair or, even if it can be repaired, much of the damage It took time and effort.

For this reason, conventional methods have been used, such as attaching reinforcing strings to the joint ears and tying the strings together after joining both ends of the dryer canvas (Utility Model Publication No. 47-41925). The joining loop used was a loop that was stronger and more durable than the central part.

On the other hand, in recent years, needle felt, in which a web is laminated and polymerized by needle punching on one or both sides of a base fabric, has been used as a dryer canvas for papermaking.

This has been used particularly as a dryer canvas for high-quality paper because it provides surface smoothness and elasticity that cannot be obtained with conventional woven dryer canvases.

Therefore, the joints of papermaking dryer canvas (hereinafter referred to as papermaking dryer felt) by needling are required to have the same thickness and surface properties as the main body.

Therefore, when reinforcing the joint ears with the attachment string described above, the string and the knot of the string protrude from the surface of the joint,
While the paper was run C times through the paper making machine, the contact pressure on the protrusion increased and damage due to wear was significant.

In addition, when protecting the protruding part with a cover cloth that covers the protruding part or an attached cloth with the same thickness as the protruding part, the thickness of the part where the cloth is attached increases, and when the roll etc. is turned, the edge Otherwise, an excessive load will be applied to the joint of the main body at that point, leading to premature damage to the joint.

On the other hand, even if a strong and durable loop is used for the joining loop at the joining ear, it is necessary to prepare a different loop material from the main body or use a different attachment method. It was complicated and required time and effort.

The present invention improves the above-mentioned drawbacks, and its configuration will be explained below based on embodiments.

In the drawings, 1 is the main body base fabric.

2 is a web on the contact side and 3 is a web on the back side.

4 is a joining loop such as a metal hook (shown in FIG. 2), and 5 is a joining core wire.

The webs 2 and 3 are both polymerized and fixed to the main body base fabric 1 by needle punching.

The joining loop 4 is formed by temporarily cutting the bond between the web 2 on the side facing the paper side of the main body base fabric 1 and the base fabric at both ends of the dryer felt, and attaching a loop or a metal hook over the entire width of the joint by a conventional method.

Thereafter, the web 2 is again fixed to the base fabric in a conventional manner.

In addition, there are methods such as forming a loop with a warp thread extending from the end of the main body base fabric 1 and then re-tapping it into the main body base fabric, inserting it into the area where the adjacent warp thread has been removed, or forming a loop with a warp thread for joining. It is also possible to adopt a method of binding or inserting the linear bodies into the base fabric of the main body after joining them.

It also includes a case where loops are formed in the base fabric before the web is needle-punched and the web is needle-punched.

After the joining loop has been attached in this manner, the abutting side web is removed over an appropriate length and width at the ear of the joining portion.

Preferably, the size is such that it does not cover the width of the wet paper.

6 is a needle felt piece for reinforcing the ears.

The needle felt piece 6 for reinforcing the ear part is made using the same technique as the main body, but it is desirable that the needle felt piece 6 has a thickness almost equal to the thickness of the paper-contact side web 2 that has been removed, so in this example The web is polymerized to only one side of the base fabric.

One of the webs and weft threads at the end of the needle felt piece 6 is removed in advance to form an extended warp thread 7, and the reinforcing felt piece 6 is finished in the same size and shape as the cut-out web 2. It is superimposed on the notch and attached by conventional methods such as sewing with a sewing machine or gluing.

Note that the reinforcing felt piece 6 is made by laminating and polymerizing webs, and is thick, so that the knots between the warp threads, which will be described later, are difficult to come out on the top surface of the paper, so needle felt is normally used, but a woven fabric without webs can be used. You can also do it.

The papermaking dryer felt with both ends finished in this way is put into the papermaking machine, and then joined together by engaging the loops 4 and inserting the core wire 5 into the common hole. The extended warp threads 7 of the needle felt piece 6 for reinforcing the ears attached to the selvage section are tied together one or more lengths at a time with the opposite end extended warp threads 7'.

When tying, the tension is the same as that applied to the joining loop 4, and each knot is made to have a uniform tension.

The number of converging extended warp threads 7 is appropriately selected so that the size of the knot does not protrude above the contact surface of the joint.

Further, depending on the required strength of the reinforcing portion, the extended warp threads may be thinned out.

Then, if necessary, a resin such as an adhesive is applied to the knot to prevent it from becoming tangled.

The end of the knotted thread is also cut to an appropriate length.

As described above, since the warp threads of needle felt can be used to reinforce the joining ears, sufficient strength required for reinforcement can be obtained.

In addition, the extended warp thread is inside the paper contact surface, and the size of the knot of the extended warp thread can be selected as appropriate, so the knot will not protrude beyond the paper contact surface of the joint, so it will not be subjected to excessive contact pressure. There is no risk of wear and damage.

Instead of the web on the contact side, a reinforcing needle felt with the same thickness is attached and used to reinforce the joint selvage, so the thickness of the joint selvage can be made to be almost the same as the thickness of the dryer felt body, so the selvage It can withstand long-term use without excessive load being applied to the joint loop.

In addition, it is easy to manufacture because all that is required is to attach a piece of reinforcing needle felt to the cutout of the web of the joint selvedge, and then converge and tie the extended warp threads.

As mentioned above, the joints require the same thickness and surface properties as the main body, such as the joints of dryer felt for high-quality paper.
It has excellent durability and is an easy-to-make joint.

[Brief explanation of the drawing]

FIG. 1 is a side view of the joint ear according to the present invention. FIG. 2 is a perspective view of a joining ear according to an embodiment of the present invention using a metal hook as a joining loop. 1... Main body base fabric, 2, 3... Main body web, 4... Joining loop, 5... Joining core wire, 6...... Reinforced felt piece, 7, 7'...
・Extended warp thread.

Claims (1)

[Scope of utility model registration request] A papermaking dryer felt in which webs are laminated and polymerized on one or both sides of a base fabric by needle punching to form a felt body, and a large number of loops attached to both ends of the felt body are engaged and joined by inserting a core wire into a common hole. At the joining part, attach a piece of needle felt with the same thickness as the web to the place where the web on one side of the both sides of the ear part was removed, and then connect the warp threads of the base fabric extending from the ends to each other after joining both ends of the felt body. A joint of papermaking dryer felt characterized by being tied together.