JP3987252B2 - Manufacturing method of sealing member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the production how a sealing member made of urethane foam material which forms the rod-shaped with long.
[0002]
[Prior art]
Conventionally, as a method for producing a urethane foam material, (A) a method for obtaining a urethane foam material having a desired shape using a foaming mold, and (B) a urethane foam material having a desired shape in a process of being transferred by a transfer conveyor. The method of obtaining is generally practiced. Among these, the manufacturing method using the foaming mold (A) uses a foaming mold 40 including a first molding mold 41 and a second molding mold 42 that can be clamped together as shown in FIG. 9, for example. Therefore, a predetermined amount of urethane raw material is injected into a cavity 43 defined by clamping the first molding die 41 and the second molding die 42, and the urethane raw material is expanded and expanded in the cavity 43. By doing so, the urethane foam material S having a desired shape is formed. In this manufacturing method, since the urethane foam material S having a desired shape is molded, post-molding is not required at all, and the manufacturing process can be rationalized, and a thin skin layer is formed on the outer surface of the urethane foam material S. Since the (skin layer) is formed, there is an advantage that the air permeability is lowered with an increase in surface strength and the application range is widened.
[0003]
On the other hand, in the manufacturing method using the transfer conveyor (B), as shown in FIG. 10, for example, sidewalls 46 and 46 are arranged at required intervals (for example, 2 m) on the upper and lower sides in the transfer direction of the transfer conveyor 45. In this method, the raw material 48 is continuously produced by continuously injecting the urethane raw material U from the raw material pouring head 47 onto the upper surface of the transfer conveyor 45 rotating at a predetermined speed. In this manufacturing method, the urethane raw material U is continuously naturally foamed in a space in which the lower surface, the left side, and the right side surface are regulated by the transfer conveyor 45 and the left and right sidewalls 46, 46, and the upper surface is not regulated. For example, the original fabric 48 is formed to have a width W = 2 m, a height H = 1 m, and a length of 10 m or more. Then, by cutting the raw fabric 48 into appropriate dimensions, a urethane foam material having a desired shape can be obtained.
[0004]
[Problems to be solved by the invention]
By the way, the production method (A) has the following drawbacks and problems. That is, the foam molding die 40 needs to be molded into a cavity shape on the premise of the final product shape of the urethane foam material S, so that the mold production cost increases, and this causes an increase in cost. Further, since the size of the foaming mold 40 is limited, for example, it is impossible to mold a long object or the like longer than the molding mold 40, and the mold clamping / opening operation or the demolding operation is accompanied. In addition, since it is a batch system, there is a disadvantage that the molding efficiency is low. Furthermore, in order to easily remove the urethane foam material S from the foam molding die 40, it is necessary to apply, for example, a wax-based mold release agent to the inner wall surface of the cavity 43 prior to foam molding. In the meantime, problems that pollute the work environment are pointed out.
[0005]
In addition, since foam molding is performed inside the two molds 41 and 42 that have been clamped, two parting lines are formed on the outer surface of the obtained urethane foam material S along the joint between both molds. It will be. Since the skin layer is not formed at the parting line, the sealing function against the gas or liquid at the part is considerably lowered. Accordingly, when the urethane foam material S having two parting lines is used as a sealing member in this way, gas or liquid is allowed to pass from one parting line to the other parting line depending on the use site. There is a difficulty that the original sealing function cannot be achieved.
[0006]
On the other hand, the manufacturing method (B) has the following drawbacks and problems. That is, since it is a continuous molding method by continuous operation of the transfer conveyor 45, the shape of the upper surface side of the foam 48 in the space where the upper surface side is not regulated is not constant, even though it is possible to mold a long object. Since the height H (thickness) dimension is large, there are disadvantages such as a density difference between the lower part and the upper part. In addition, the urethane foam material S obtained by cutting the raw fabric 48 even when the raw fabric 48 itself foam-molded to the size has a thin skin layer (skin layer) formed on the outer surface thereof. Since there is no skin layer on the outer surface, the outer surface weakens and the air permeability increases, and there is also a problem that the application range is limited. Furthermore, there is a problem with processing of processing waste generated after cutting out the urethane foam material from the raw fabric 48, and the size of the raw fabric 48 is so large that it is difficult to secure and manage a safe storage location. There is also a problem.
[0007]
OBJECT OF THE INVENTION
The present invention has been proposed to suitably solve the above-described problems. A sealing member made of a urethane foam material having a skin layer formed on the outer surface excluding both ends and having only one parting line . an object of the present invention is to provide a manufacturing how.
[0008]
[Means for Solving the Problems]
In order to solve the above problems and achieve the intended purpose, a method for producing a sealing member according to the present invention includes:
After the urethane raw material is continuously supplied from the raw material pouring head to the upper smooth surface of the molding paper that is continuously fed from the base paper roll and travels, both longitudinal edges of the molding paper are brought into contact with each other in the shape of a palm. Deformed into a cylindrical shape,
The cylindrical portion formed by deforming the molding paper is aligned with the molding chamber of the cylindrical guide member disposed on the downstream side, and the both ends are formed in linear slits opened in the longitudinal direction of the guide member. Align the abutting piece formed by abutting the edge,
The contact piece extending from the slit is sandwiched from both sides by a transfer conveyor disposed oppositely, and the cylindrical portion is moved into the molding chamber by the rotating transfer conveyor,
In the process of moving the cylindrical portion in the molding chamber, the urethane raw material supplied to the molding paper is foamed and expanded, so that the cylindrical portion that is in close contact with the inner wall surface of the molding chamber is long and stick-shaped. continuously forming the urethane foam forming a
By peeling the molding paper from the molded and solidified urethane foam material, a thin skin layer is formed on the outer surface of the urethane foam material that has been in contact with the upper smooth surface of the molding paper, and One parting line is formed in the longitudinal direction along the base portion of the both edge portions in contact with the palm shape of the formed paper .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Then, per preparation how a sealing member according to the present invention, by way of preferred embodiments will be described below with reference to the accompanying drawings. First, a molding apparatus used to carry out a continuous production method of a urethane foam material as a sealing member will be described.
[0011]
(Molding equipment)
FIG. 1 is a perspective view in which a part of a molding apparatus 10 as a manufacturing apparatus for suitably carrying out a method for continuously producing a urethane foam material according to the present embodiment is omitted. FIG. 2 is an upstream view of the molding apparatus 10 shown in FIG. FIG. 3 is a partial plan view of the upstream side of the molding apparatus 10 shown in FIG. The molding apparatus 10 includes a supply unit 11 that feeds the molding paper P and supplies the urethane raw material U, and a molding unit 12 that foams the urethane raw material U and molds the urethane foam material S. The urethane raw material U is supplied to the upper surface of the molding paper P that is continuously sent out at a constant speed toward the surface, and when the molding paper P deformed into a cylindrical shape passes through the molding portion 12, the urethane raw material U is placed inside. The urethane foam material S is molded by foaming.
[0012]
(Supply section)
The supply unit 11 is disposed on the inlet side of the forming unit 12 and a cylindrical shape, and is disposed on the entrance side of the forming unit 12 to continuously feed the forming paper P wound around the base paper roll 15 toward the forming unit 12 at a constant speed. A holding roller 17 for holding the end portion of the molded paper P deformed into a shape and a raw material dispensing head 18 for continuously dispensing the urethane raw material U onto the upper surface of the molded paper P are provided. That is, the forming paper P that is continuously fed from the base paper roll 15 by the feeding roller 16 and travels horizontally has a flat shape when passing through the feeding roller 16. When moving between the holding rollers 17, both edge portions 31, 31 abut on each other like a palm and gradually deform into a cylindrical shape, and a contact piece formed by abutting each edge 31, 31. The holding roller 17 is rolled and clamped from both sides, so that a closed cylindrical tubular portion 32 is formed. Note that the supply amount of the urethane raw material U supplied to the molding unit 12 is determined by the feeding speed of the molding paper P driven by the feeding roller 16 and the amount of the urethane raw material U discharged by the raw material discharge head 18 per unit time. It is determined.
[0013]
(Molding part)
The molding part 12 is composed of a cylindrical guide member 20 having a required length that extends linearly, and a plurality of transfer conveyors 25 disposed above the guide member 20. The cylindrical guide member 20 has a molding chamber 21 formed in a cross-sectional shape on the premise of the cross-sectional shape and size of the urethane foam material S (in the embodiment, a circular cross-section), and on the upper side wall portion thereof, A slit 22 opened in the longitudinal direction is formed with a width that allows the molding paper P to pass through the contact piece 33, and can be manufactured at low cost. Therefore, when the paper P formed in the cylindrical portion 32 and the contact piece portion 33 in the supply unit 11 arrives at the cylindrical guide member 20, the cylindrical portion 32 enters the molding chamber 21. At the same time, the corresponding contact piece portion 33 is aligned with the slit 22 and extends above the guide member 20. Note that a heating means such as a heater may be attached to the outside of the cylindrical guide member 20 so that the urethane raw material U can be foam-molded in the cylindrical guide member 20 heated to an appropriate temperature.
[0014]
Each of the transfer conveyors 25 is disposed above the cylindrical guide member 20 so as to face both sides of the slit 22, and a plurality of the transfer conveyors 25 are arranged on the cylindrical guide member 20. They are arranged in series over the longitudinal direction. Each transfer conveyor 25 faces a part of the belt 26 on the slit 22 side, and is driven to rotate at a constant speed by a driving device (motor or the like) (not shown). The contact piece 33 extending upward from the slit 22 is sandwiched from both sides by the belts 26 and 26 of the respective transfer conveyors 25 disposed opposite to each other, and rotates at a constant speed. 26, the cylindrical portion 32 of the molding paper P moves in the molding chamber 21 at a constant speed. In the course of movement of the molding paper P in the molding chamber 21 of the cylindrical guide member 20, the urethane raw material U expands due to a foaming reaction in the cylindrical portion 32 of the molding paper P.
[0015]
A delivery conveyor (not shown) for feeding the contact piece 33 or the cylindrical part 32 in a sandwiched state is disposed on the downstream side of the molding part 12, and the molding paper P and the molding paper are provided. Smooth delivery of the urethane foam material S coated with P can be achieved.
[0016]
(Molded paper)
The molding paper P has an upper smooth surface 30 coated with, for example, a silicone resin on at least the side in contact with the urethane raw material U. For example, the so-called “peeling paper” used in various fields and supplied at low cost. Is preferably provided for implementation. That is, since the urethane raw material U is foam-molded in a state where it is in contact with the upper smooth surface 30 in the space of the cylindrical portion 32 in the molding paper P, the outer surface of the molded urethane foam material S is entirely covered with the skin. A layer (skin layer) 35 is formed. The molding paper P is required when foaming the urethane foam material S with the molding apparatus 10 and is not required after it has been peeled from the foam material S in a timely manner after the molding of the urethane foam material S is completed.
[0017]
Next, a method for continuously producing a urethane foam material according to this embodiment, which is performed using the molding apparatus 10 configured as described above, will be described.
[0018]
(Constant speed supply of molding paper)
In a state where the feeding roller 16 and the transfer conveyor 25 are synchronously operated at a constant speed, the forming paper P fed from the base paper roll 15 mounted on the supply unit 11 is made to face the feeding roller 16. Then, the formed paper P which has passed through the feeding roller 16 is deformed into a cylindrical shape by abutting both end edges 31 and 31 in a palm shape, and a contact piece formed by abutting the both end edges 31 and 31. The portion 33 is sandwiched between the holding rollers 17. Further, the cylindrical portion 32 of the deformed molding paper P is aligned in the molding chamber 21 of the cylindrical guide member 20, while the abutting piece portion 33 that has passed through the holding roller 17 is aligned with the slit 22, thereby The part 32 enters the molding chamber 21 and the corresponding piece 33 is sandwiched between the transfer conveyors 25. As a result, the abutting piece portion 33 moves following the belt 26 while being sandwiched between the belts 26 of the respective transfer conveyors 25, so that the cylindrical portion 32 moves in the molding chamber 21 of the cylindrical guide member 20. To move. Accordingly, the forming paper P fed out from the base paper roll 15 into a flat plate shape is deformed into a cylindrical shape before running horizontally and reaching the cylindrical guide member 20, and along the cylindrical guide member 20 at a constant speed. To move.
[0019]
(Urethane raw material extraction process)
In a state where the molding paper P is continuously fed out at a constant speed, when the urethane raw material U is poured out from the raw material dispensing head 18 installed above the supply unit 11, the molding paper P is still a cylinder. Since it is in a state before being deformed into a shape, the poured urethane raw material U falls on the upper smooth surface 30 of the molding paper P (FIG. 1). At this time, by continuously pouring the urethane raw material U from the raw material pouring head 18, the urethane raw material U is supplied onto the upper smooth surface 30 of the forming paper P in a continuous streak shape.
[0020]
For example, when the molding paper P on which the urethane raw material U is placed on the upper smooth surface 30 is viewed on the basis of the point A shown in FIG. A contact piece 33 formed by abutting both end edges 31, 31 when the point A passes through the holding rollers 17, 17. The abutting piece portion 33 forms a cylindrical portion 32 that is closed in the cross-sectional direction. Thereby, the urethane raw material U received by the upper smooth surface 30 is in a state of being accommodated inside the tubular portion 32.
[0021]
(Urethane raw material foaming process)
When the molding paper P further moves and the point A arrives at the end of the inlet side of the cylindrical guide member 20, the cylindrical portion 32 enters the molding chamber 21 of the cylindrical guide member 20 and comes into contact therewith. The piece 33 is aligned with the slit 22 and extends upward from the slit 22 and is sandwiched between the transfer conveyors 25. And the urethane raw material U accommodated in the said cylindrical part 32 has started the foaming reaction from the time after being poured out from the said raw material extraction head 18, and A point of the said shaped paper P is a cylindrical guide. When reaching the point B (FIG. 1) of the member 20, the member 20 is expanding inside the cylindrical portion 32 (FIG. 5). Then, after a further appropriate time, the urethane raw material U expands to the entire inside of the cylindrical portion 32. At this time, the cylindrical portion 32 of the molding paper P is pressed against and closely adheres to the inner wall surface of the molding chamber 21 by the foaming pressure caused by the foaming / expansion of the urethane raw material U, so that the entire surface of the urethane raw material U is regulated by the molding chamber 21. It becomes to foam in the created space.
[0022]
Then, the foaming reaction of the urethane raw material U is completed within a required time until the molding paper P further moves and the point A reaches the outlet side of the cylindrical guide member 20, and the cross section along the cross sectional shape of the molding chamber 21. The urethane foam material S cured into a shape is formed (FIG. 6). When the point A comes out of the cylindrical guide member 20 due to the movement of the molding paper P, the urethane foam material S positioned inside the point A is completely solidified in the cylindrical portion 32 of the molding paper P. .
[0023]
Thus, in the continuous manufacturing method of the present embodiment, the long and rod-shaped urethane foam material S having the cross-sectional shape of the sealing member , which is the final product , is continuously formed inside the cylindrical portion 32 of the molded paper P. Can be molded. (Figure 7). In addition, if the molded paper P is peeled from the urethane foam S that has been molded and solidified through the cylindrical guide member 20, the urethane foam material S that has been in contact with the upper smooth surface 30 of the molded paper P is removed. A thin skin layer 35 is formed on the outer surface (FIG. 8). That is, the obtained urethane foam material S is a urethane foam that is long and continuous in a rod shape, and the outer surface other than both ends thereof is substantially covered with a skin layer. Moreover, on the outer surface of the urethane foam material S, there is only one parting line PL extending in the longitudinal direction. Here, the term “substantially” is because, depending on the state of the molded paper P, the skin layer may not be completely formed on the entire outer surface other than both ends of the urethane foam material S. . Therefore, if the state of the upper smooth surface 30 of the molded paper P is good, the skin layer is formed on the entire outer surface of the urethane foam material S excluding both ends.
[0024]
Thus, in the continuous production method of the urethane foam material according to the present embodiment using the molding apparatus 10, the urethane stock solution U is supplied to the upper smooth surface of the molded paper P that is continuously drawn and travels horizontally, The cylindrical part 32 formed by deforming the molded paper P is moved along the molding chamber 21 of the cylindrical guide member 20, and the urethane raw material U poured out in the cylindrical part 32 is foamed at this time. Thus, the long and rod-like urethane foam material S can be continuously formed. Further, since the cylindrical portion 32 that has entered the molding chamber 21 is formed as a closed space by the contact of the contact piece portion 33, the same pressure is applied to the entire outer surface of the molded urethane foam S. And the entire urethane foam S is cured at a uniform density. In addition, since the cylindrical guide member 20 is manufactured at a low cost, the molding paper P is supplied at a low cost, and there is no need for post-molding, the molding cost can be greatly reduced. As shown in FIG. 5, the degree of contact of the contact piece 33 that is sandwiched between opposing transfer conveyors 25, 25 and has a palm-like shape is the foaming reaction of the urethane raw material U inside the tubular portion 32. The degree of gas is caused to escape to the outside, but the urethane raw material is not allowed to escape.
[0025]
In the above embodiment, the case where the molding chamber 21 of the cylindrical guide member 20 is set to have a circular cross-section and the urethane foam material S having a circular cross-section is continuously formed is exemplified. However, the cross-sectional shape of the molding chamber 21 is polygonal. If the shape is set to be oval, the cylindrical portion 32 of the molded paper P is deformed along this shape, so that the urethane foam material S having a cross-sectional shape corresponding to the shape is continuously formed. In addition, regardless of the cross-sectional shape, a skin layer 35 is formed on the outer surface of the molded urethane foam material S due to contact with the upper smooth surface 30 of the molded paper P. As a result, the application range is widened.
[0026]
【The invention's effect】
As described above, the manufacturing method of the sealing member according to the present invention is such that the urethane worm material manufactured by this method is substantially covered with a skin layer on the outer surface except for both ends thereof, and one on the outer surface. Only parting lines extend in the longitudinal direction. Therefore, since the sealing member made of this urethane foam material has only one parting line, there is no escape port even if gas or liquid enters from the side of the line. There is an advantage that the sealing function is sufficiently fulfilled. Moreover, the sealing member made of urethane foam material has a thin skin layer formed on the outer surface that was in contact with the upper smooth surface of the molded paper, so that the air permeability can be lowered as the surface strength is increased. Has an effect.
Further, in the method for producing a sealing member according to the present invention, a tubular shape formed by continuously supplying a urethane stock solution to the upper smooth surface of a continuously formed paper that is fed out and runs horizontally, and deforming this paper. The part is moved along the inside of the cylindrical guide member, and at this time, the urethane raw material is expanded and expanded in the cylindrical part, so that a long and rod-like urethane foam material can be continuously formed. There are advantages. In addition, the cylindrical guide member can be manufactured at low cost, and the molded paper is also supplied at low cost and does not require post-molding. Therefore, there is an advantage that the molding cost can be greatly reduced. And since the contact piece portion of the forming paper is extended upward from the slit and is held between the belts of the transfer conveyor that rotates the contact piece portion from both sides, the cylindrical portion of the forming paper is Can be moved inside the guide member .
[Brief description of the drawings]
FIG. 1 is a partially omitted perspective view of an apparatus for carrying out a continuous manufacturing method of a sealing member according to a preferred embodiment of the present invention.
2 is a partial front view on the upstream side of the molding apparatus shown in FIG. 1. FIG.
FIG. 3 is a partial plan view on the upstream side of the molding apparatus shown in FIG. 1;
4 is a cross-sectional view taken along the line IV-IV in FIG. 1, and shows a process when the molded paper supplied with the urethane raw material is gradually deformed into a cylindrical shape.
FIG. 5 is a cross-sectional view taken along line VV in FIG. 1 and shows a state in which a urethane raw material is foamed and expanded inside a cylindrical portion passing through a cylindrical guide member.
6 is a cross-sectional view taken along the line VI-VI of FIG. 1, and the urethane foam material that has expanded inside the cylindrical portion that has passed through the cylindrical guide member is hardened and conforms to the inner shape of the guide member. Shows a state in which it is being molded.
7 is a partial perspective view showing a urethane foam material molded by the molding apparatus shown in FIG. 1 in a mounted state of molded paper.
8 is a partial perspective view showing a urethane foam material molded by the molding apparatus shown in FIG. 1 in a state in which the molded paper is partially peeled, and one parting in the longitudinal direction of the outer surface thereof. A line is formed.
FIG. 9 is a cross-sectional view of a conventional example showing a state where a urethane foam material is molded in a cavity of a foam molding die.
FIG. 10 is a conventional example in which a raw material made of urethane foam material is continuously formed on a transfer conveyor, and (a) shows a state in which a raw material is formed by foaming urethane raw material poured out on the transfer conveyor. (B) is the XX sectional view taken on the line of (a).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 15 Base paper roll 18 Raw material extraction head 20 Cylindrical guide member 21 Molding chamber 22 Slit 25 Transfer conveyor 30 Upper smooth surface 31 Edge part 32 Cylindrical part 33 Contact piece part
35 Skin layer ( skin layer )
P Molded paper
PL Parting line S Urethane foam material U Urethane raw material

Claims (1)

The urethane raw material (U) is continuously fed from the raw material dispensing head (18) to the upper smooth surface (30) of the molding paper (P) that is continuously fed from the base paper roll (15) and then travels. The two edge portions (31, 31) in the longitudinal direction of the paper (P) are brought into contact with each other like a palm and deformed into a cylindrical shape,
The cylindrical portion (32) formed by deforming the molding paper (P) is aligned with the molding chamber (21) of the cylindrical guide member (20) disposed on the downstream side, and the guide member (20 ) And a linear slit (22) opened in the longitudinal direction of the above, align the abutting piece portion (33) formed by abutting the both edge portions (31, 31),
The abutting piece (33) extending from the slit (22) is sandwiched from both sides by a transfer conveyor (25) disposed oppositely, and the cylindrical portion ( 32) is moved into the molding chamber (21),
In the process of moving the cylindrical portion (32) in the molding chamber (21), the urethane raw material (U) supplied to the molding paper (P) is expanded and expanded, thereby forming the molding chamber (21). Continuously molding a long and rod-shaped urethane foam material (S) inside the cylindrical part (32) that is in close contact with the inner wall surface of
By peeling the molded sheet (P) from the urethane foam material it was made of molded and solidified (S), the urethane foam material was in contact with the upper flat surface (30) of the molded sheet (P) (S and forming epidermal layer of thin film (35) on the outer surface of) the both end edge portions in contact with the butt-seamed of the molded sheet (P) 1 pieces of longitudinally along the base of (31, 31) A method for manufacturing a sealing member, comprising forming a parting line (PL) .

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