JP3878347B2 - End surface processing method and apparatus for hollow body synthetic resin plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for treating an end surface of a relatively thick hollow body synthetic resin plate used for building materials, container forming materials, and the like.
[0002]
[Prior art]
Recently, as shown in FIG. 2 (a), a relatively thick (for example, 9 mm or more) hollow body in which a plurality of webs 3 are integrally formed between the front wall 2 and the back wall 2 'at regular intervals. A plate material made of the synthetic resin plate 1 is used as a building material or a container forming material. These hollow synthetic resin plates are lightweight and strong. For example, when used as a concrete formwork material for civil engineering construction, there are advantages that the surface is smooth and the concrete peelability is good and can be used repeatedly. However, since this hollow synthetic resin plate has a large number of opening grooves 4 whose end faces are open in the web axial direction, foreign substances such as dust and insects or the like in the opening grooves 4 in the repeated use process. There is a fault that rainwater invades. For this reason, in order to prevent the intrusion of foreign matter, an end surface treatment for sealing both ends of the opening groove has been performed.
[0003]
As a conventional end surface treatment method, the end surface portion of the hollow synthetic resin plate facing the opening groove is provided with a margin of about 40 to 50 mm from the end edge, and a V-shaped seal bar is used from the top. After that, the allowance portion is bent at a right angle from the V-shaped melted portion and thermally welded, and the portion protruding from the front wall surface is trimmed to perform end surface treatment.
[0004]
[Problems to be solved by the invention]
Therefore, as shown in FIG. 5, the hollow body synthetic resin plate 40 subjected to the end face treatment by the conventional end face treatment method is in a state in which the opening groove is opened and the recess 41 is formed on the upper surface of the end face processing portion. The face is not completely closed. For this reason, dust and insects are likely to adhere to the recesses, and the conventional drawbacks have not been solved, and the use in the food field and the medical field has not been satisfactory. Moreover, since the concave portion is exposed on the surface of the product, there are disadvantages such as poor appearance.
[0005]
The present invention was devised in view of the above circumstances, and completely clogs the opening groove on the end surface of the relatively thick hollow synthetic resin plate to prevent invasion of dust and insects and intrusion of rainwater. Safety, hygiene, and aesthetics that can be used in the food and medical fields, have an open groove without being exposed to the outside, and can improve the rigidity of the hollow synthetic resin plate and to provide a hollow body of synthetic resin plate end surface processing method and apparatus for obtaining a hollow body synthetic resin plate having excellent end surface processor sex and strength.
[0006]
[Means for Solving the Problems]
The hollow body synthetic resin plate obtained by the present invention that solves the above problems is bent at a right angle so that a predetermined thickness portion including at least the back wall of the end surface portion facing the opening groove between the webs closes the opening groove. A first bent portion and a second bent portion that is bent at a right angle from the first bent portion at the position of the thickness of the hollow body synthetic resin plate, and the back wall surface of the second bent portion Is formed by being bent so as to be substantially flush with the front wall surface of the hollow synthetic resin plate, connected to the front wall, and welded. The terms “front” and “back” in the back wall and front wall of the hollow synthetic resin plate used in this specification are for distinguishing one of the liners on both sides of the hollow synthetic resin plate from the other. It is a term used for convenience and does not necessarily represent the front and back physically.
[0007]
An end face treatment method for a hollow body synthetic resin plate according to the present invention is an end face treatment method for a hollow body synthetic resin plate in which a plurality of webs are integrally formed between a front wall and a back wall at equal intervals. the first frit trenches in the molten surface and the second frit trenches with an end face processing unit opening groove is facing melted and the thickness of about 1 / 2-2 / 3 and more molding hot plate to form a molten surface A bending welding step in which the melting surface is bent from the first melting groove and the second melting groove, and a distal end portion of the melting surface is welded to a base end portion, and the bending welding step includes: A step of pushing up the second bent portion located at the tip of the melting surface from below and bending the second bent portion at a right angle from the second molten groove, and the first bent portion located at an intermediate portion between the first molten groove and the second molten groove And pushes the second bent portion to join and weld the tip of the second bent portion to the tip of the front wall. Characterized by comprising the steps.
[0008]
In addition, another method for treating the end face of a hollow synthetic resin plate according to the present invention includes a step of forming a melt groove with a molded hot plate in an end face treatment portion facing an opening groove between webs, and a tip portion from the melt groove. Corresponding to the step of forming a bent portion by bending at a right angle, the step of cutting and removing the bent portion to a substantially front wall position leaving at least the back wall, and the thickness of the remaining bent portion remaining after the cutting and removal Then, the step of melting the upper surface of the hollow body synthetic resin plate to a predetermined depth by the area of the residual bent portion to form a molten surface, the bending welding step of folding and welding the residual bent portion to the molten surface It can also be achieved by technical means characterized by comprising:
[0009]
An end surface treatment apparatus for a hollow body synthetic resin plate of the present invention that achieves the above-described end surface treatment method is an end surface treatment apparatus for a hollow body synthetic resin plate in which a plurality of webs are integrally formed at regular intervals between a front wall and a back wall. And forming heat that forms a first molten groove and a second molten groove on the molten surface, and a molten surface having a thickness of about 1/2 to 1/3 at the end surface processing portion facing the opening groove between the webs. plate, the melt surface by bending from the first melt groove and the second frit trenches, it has a bent plate for welding folded to the proximal end of the distal portion of the molten surface, the folding The first folding plate that pushes up the melting surface tip from below and bends the melting surface at a right angle from the second melting groove, and the second folding that pushes up the intermediate portion between the first melting groove and the second melting groove from below. A curved plate, comprising a third bent plate that presses the distal end portion of the melting surface downward and folds the distal end portion of the molten surface to the base end portion for welding. It is intended to.
[0010]
Further, the end face processing method includes a forming hot plate for forming a melt groove in an end face processing portion where the opening groove between the webs faces, a front end portion of the melt groove is bent at a right angle and welded. A folding plate that forms a portion, a cutter that cuts and removes the folded portion to a substantially front wall surface position leaving at least a back wall, and the residual folded portion corresponding to the thickness of the remaining folded portion remaining after the cutting and removal. A heating seal bar that melts the upper surface of the hollow body synthetic resin plate to a predetermined depth to form a molten surface, and is disposed so as to be displaceable in the horizontal direction so that the residual bent portion is folded and welded to the molten surface. This can also be achieved by employing technical means characterized by comprising the second bent plate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an outline of a method for treating an end face of a hollow body synthetic resin plate according to an embodiment of the present invention. As shown in FIG. 3A, the hollow body synthetic resin plate 1 before the end surface treatment is formed by a web 3 provided at equal intervals between a front wall 2 and a back wall 2 ′ corresponding to a cardboard liner. It has a through-opening groove 4 whose both end faces are open, and is integrally formed of a synthetic resin such as polypropylene or polycarbonate by extrusion molding. FIG. 5B shows a state in which the end surface of the hollow body synthetic resin plate facing the opening groove is subjected to an end surface treatment to completely close the opening groove, and the hollow body synthetic resin plate according to the embodiment of the present invention. Represents. The end surface structure of the hollow body synthetic resin plate of this embodiment is bent at a right angle so that a predetermined thickness portion including at least the back wall 2 ′ of the end surface portion facing the opening groove between the webs closes the opening groove. The first bent portion 5 and the second bent portion 6 bent at a right angle from the first bent portion at the position of the thickness of the hollow body synthetic resin plate, and the back of the second bent portion The wall 2 ′ is bent and connected to the front wall 2 so as to be substantially flush with the front wall 2 of the hollow body synthetic resin plate. An end face processing apparatus and a processing method for forming the end face structure will be described with reference to FIGS.
[0012]
The end face processing station includes a receiving plate 10 that receives the hollow synthetic resin plate 1, a gauge plate 11 that positions the end face, a molded hot plate 12, a first bent plate 13, a second bent plate 14, and a third bent plate. 15 is arranged. The molding hot plate 12 is for melt-molding the end surface portion of the hollow body synthetic resin plate so that the end surface portion of the hollow body synthetic resin plate can be bent. A melt surface forming die 16 that forms a melt surface 9 by melting to a thickness of 面, a first triangular groove forming die 17 and a second triangular groove forming die 18 for forming two triangular melting grooves. Have. The two triangular groove forming surfaces are bent first from the second melting groove 8 when the melting surface 9 is sequentially bent from the melting grooves formed by these triangular groove forming dies as described later. Further, in order to make the second melting groove 8 easier to bend than the first melting groove 7, the tip of the second triangular groove forming die 18 protrudes slightly larger than the tip of the first triangular groove forming die 17. . The molding hot plate 12 is fixed to the heater 19 and is driven up and down by an appropriate actuator such as a cylinder device (not shown).
[0013]
In order to prevent the resin from protruding from the tip of the gauge 11 when the molding hot plate 12 descends to form the first molten groove 7 and the second molten groove 8 in the hollow body synthetic resin plate 1, FIG. As shown to b), it is supported by the support rod 20 so that it may descend | fall in synchronization with the shaping | molding hot plate 12 in the state which contact | abutted the hollow body synthetic resin board front-end | tip. The first bent plate 13 is used to bend the end surface treatment portion of the hollow body synthetic resin plate from the second molten groove 8, and is outside the second molten groove 8 (that is, the second bent portion 6). It is arranged at a position where the wall is vertically pushed up from below, and is driven up and down by an appropriate actuator such as a cylinder device.
[0014]
The second bent plate 14 is used to further bend the end surface processing portion of the hollow body synthetic resin plate along the first melting groove 7, and between the first melting groove 7 and the second melting groove 8 (that is, the first melting groove 8). It is disposed at a position where the back wall of the first bent portion 5) is pushed up vertically from below, and is driven up and down by an appropriate actuator such as a cylinder device. The third bent plate 15 pushes the end of the second bent portion 6 in the state bent by the second bent plate along the surface of the hollow body synthetic resin plate from the horizontal direction and presses downward. The folded curved surface is formed on the surface of the hollow body synthetic resin plate and welded to the uniform surface, and is arranged so that it can be moved left and right and moved up and down by an appropriate actuator (not shown).
[0015]
The hollow body synthetic resin plate end face treatment apparatus of the present embodiment is configured as described above. In FIG. 1A, the hollow body synthetic resin plate 1 is conveyed on a receiving plate 10 by an appropriate conveying means, The end surface is positioned by abutting the end surface portion where the opening groove 4 is open to the gauge plate 11 descending to the gauge position. At that time, as shown in FIG. 1, the first melting groove of the hollow body synthetic resin plate is obtained by the arrangement relationship of the hollow body synthetic resin plate 1, the first bent plate 13, the second bent plate 14, and the molded hot plate 12. 7 is positioned so that the bottom is located at the tip of the cradle 10 (FIG. 1A). In this state, the molding hot plate 12 heated to the set temperature in advance is lowered by a predetermined amount, and the end surface processing portion of the hollow body synthetic resin plate 1 is melt-molded ((b) in the figure). The heating temperature of the molding hot plate may be selected according to the type of resin of the hollow body synthetic resin plate, but in the case of polypropylene or polycarbonate, it is preferable to maintain about 220 ° C to 250 ° C. Further, it is preferable that the melting amount by the molding hot plate is slightly shallower than a predetermined amount in consideration of a crushing margin at the time of molding. For example, when the end surface portion is turned back to ½ thickness, the thickness of the hollow body synthetic resin plate When the thickness is Tmm, the stroke of the molten surface molding die 16 with respect to the hollow body synthetic resin plate is preferably in the range of T / 2− (0.5 to 1 mm). For the same reason, the apex angle θ of the first triangular groove mold 7 and the second groove mold 8 is preferably slightly smaller than a right angle, for example, about 70 to 85 °.
[0016]
When the melt molding is finished, the molding hot plate 12 rises to the original position and the first folding plate 13 rises to push up the second bent portion 6 of the hollow body synthetic resin plate, and from the second melting groove 8 The tip is bent at a right angle and welded (FIG. 2 (a)). At this time, since the depth of the second melting groove 8 is deeper than that of the first melting groove 7 (that is, the groove bottom thickness is thin), the second melting groove 8 is easily bent from the second melting groove 8, and the first melting groove 8 is surely made. A fold is performed. Next, the second bent plate 14 rises and pushes up the first bent portion 5 of the hollow body synthetic resin plate from below, and the second bent plate 14 is lifted at one end at an intermediate position shown in FIG. Stop. Simultaneously with the stop of the second bent plate 14, the third bent plate 14 moves forward horizontally, touches and presses the back surface of the second bent portion 6 in the inclined state, and further moves forward to overcome the back surface. The state shown in FIG. 2B is reached and the forward movement is stopped. Next, ascending the second bent plate 14 and lowering the third bent plate are performed in synchronism with each other, so that the first bent portion 5 is located with respect to the hollow synthetic resin plate as shown in FIG. And the second bent portion is welded to the base end portion of the melt surface to become a substantially uniform surface with the front wall surface of the hollow body synthetic resin plate. In this state, pressing and holding for a predetermined time ensures welding and cooling.
[0017]
As described above, the hollow body synthetic resin plate 1 ′ subjected to the end surface treatment by the end surface treatment method of the present embodiment is as shown in FIG. 3B, and even if it is a thick hollow body synthetic resin plate, the opening groove Is completely sealed, can reliably prevent intrusion of rainwater and foreign matter, is hygienic, and can be used in applications such as food and medical fields. Further, since the resin is melted and heated to the minimum necessary level, the resin does not cause sink marks, and the end portion is bent at a right angle, so that the appearance is good and the rigidity is increased.
[0018]
FIG. 4 shows another embodiment of the end surface processing method of the present invention. In the present embodiment, a triangular melting groove 27 is first formed by a forming hot plate 26 having a triangular groove forming die 25 (not shown) (FIG. 1A). Next, the tip is pushed up from below by the first bent plate 28 in the same manner as in the above embodiment, and the bent portion 29 is bent and held at a right angle and welded at the triangular melting portion (FIG. 5B). After cooling, the second bent portion is formed by cutting and removing the portion indicated by the phantom line hatched portion S in FIG. A portion of the bent portion 29 excluding the second bent portion 31 forms one bent portion 30. Next, by the heating seal bar 22 indicated by the phantom line in FIG. 4C, the surface wall portion P (shown by the imaginary line in FIG. 4C) of the portion where the second bent portion 31 of the hollow body synthetic resin plate is folded. The minimum required heating and melting of melting and heating of the welding surface of the second bent portion back wall 31 is performed. Thereafter, the back wall 23 is bent at a right angle and pressed with a second bent plate corresponding to the third bent plate in the above embodiment, and then formed into a state shown in FIG. End face processing ends.
[0019]
As described above, according to the present embodiment, the hollow body synthetic resin plate 1 is melted to the minimum necessary as compared with the above embodiment, and therefore, the end surface treatment of the hollow body synthetic resin plate using the synthetic resin having a high melting point. Is more advantageous.
[0020]
Although various embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made within the scope of the technical idea. For example, in the embodiment shown in FIG. 1, the melting surface 9 is formed by melting the resin with the molding hot plate 12, but it may be formed by cutting and removing with a cutter as in the embodiment shown in FIG. 4. Thereby, the amount of resin melt in the mold can be further reduced. Conversely, in the embodiment shown in FIG. 4, it is also possible to form the second bent portion by melting the resin with a molded hot plate without using a cutter. Further, in the embodiment shown in FIG. 1, the folding order of the first bent portion and the second bent portion is such that the second bent portion edge is satisfactorily joined to the front wall edge. Although it is easy and desirable, it is not necessarily limited to this order, and it is also possible to bend from the first bent portion first. Further, the present invention can be suitably applied to the end surface treatment of a hollow synthetic resin plate having a thickness of 9 mm or more, but can also be applied to the end surface treatment of a thin hollow synthetic resin plate having a thickness of 9 mm or more.
[0021]
【The invention's effect】
As described above, according to the hollow body synthetic resin plate and the end surface treatment method and apparatus thereof of the present invention, the opening groove on the end surface of the relatively thick hollow body synthetic resin plate can be completely plugged. Even if it is used for a long time, it can completely prevent the invasion of foreign substances such as dust and insects and the intrusion of rainwater. Can be spread. In addition, the opening groove is completely sealed so that it is not exposed to the outside, and the end face can be processed by melting the resin as much as possible. Therefore, there is little occurrence of sink marks and warpage, and the appearance is good. Moreover, since the opening part of an end surface is completely sealed, the rigidity of a hollow body synthetic resin board can be improved. Therefore, it is possible to obtain a hollow body synthetic resin plate having an end surface treatment portion excellent in safety, hygiene, aesthetics, and strength.
[0022]
Furthermore, according to the method and apparatus for treating a hollow body synthetic resin plate according to the present invention, the configuration of the device is simple, and a molding hot plate and a bent plate are arranged in one station, so that it is automatically performed in one station. In particular, the end surface treatment of the hollow synthetic resin plate can be performed, and the productivity is excellent.
[Brief description of the drawings]
1A to 1B are schematic views showing an end face treatment process of a hollow body synthetic resin plate of the present invention.
FIGS. 2A to 2C are schematic views showing an end face treatment step of the hollow body synthetic resin plate of the present invention following FIG. 1B.
FIG. 3A is a perspective view of a main part of a hollow body resin plate before end face processing. (B) is a principal part perspective view of the hollow body synthetic resin board after an end surface process.
FIGS. 4A to 4D are schematic views showing an end face treatment process of a hollow body synthetic resin plate according to another embodiment of the present invention.
FIG. 5 is a perspective view showing an end surface processing portion of a conventional hollow resin plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hollow body synthetic resin board 2 Front wall 2 'back wall 3 Web 4 Opening groove 5, 30 1st bending part 6, 31 2nd bending part 7 1st melting groove 8 2nd melting groove 9 Melting surface 11 Gauge board 12, 26 Molded hot plates 13, 28 First folded plate 14 Second folded plates 14, 32 Third folded plate 17 First triangular groove forming die 18 Second triangular groove forming die

Claims (4)

A hollow body synthetic resin plate end face processing method in which a plurality of webs are integrally formed at equal intervals between a front wall and a back wall, wherein an end face processing portion facing an opening groove between the webs is formed as a hot plate approximately 1 / 2-2 / forming a first molten groove and the second frit trenches 3 by melting a thickness on the molten surface to form a melt surface, the first melt groove the melt surface and more It consists of a bending welding process in which the distal end portion of the melting surface is welded to the base end portion by bending from the second melting groove, and the bending welding step moves the second bending portion positioned at the distal end portion of the melting surface downward. Pushing up from the second molten groove and bending and welding at right angles from the second molten groove, pushing up the first bent portion located at the intermediate portion between the first molten groove and the second molten groove from below, and the second bent portion hollow body synthetic resin, characterized in that comprising the step of bonding welded pressed by the tip of the second bent portion in the front wall tip The end face processing method of the plate.   A hollow body synthetic resin plate end face processing method in which a plurality of webs are integrally formed between a front wall and a back wall at equal intervals, and a hot plate formed on an end face processing portion facing an opening groove between the webs A step of forming a melting groove by the step, a step of bending the tip from the melting groove at a right angle to form a bent portion, a step of cutting and removing the bent portion to a substantially front wall surface position at least leaving the back wall, A step of melting the upper surface of the hollow body synthetic resin plate to a predetermined depth corresponding to the thickness of the remaining bent portion remaining after the cutting and removing, and forming the molten surface; A method for treating the end face of a hollow body synthetic resin plate, comprising a bending welding step in which a part is folded and welded to the melting surface. A hollow body synthetic resin plate end face processing apparatus in which a plurality of webs are integrally formed at regular intervals between a front wall and a back wall, and is approximately ½ in an end face processing portion facing an opening groove between the webs. ~ 1/3 thick melt surface and a forming hot plate forming the first melt groove and the second melt groove on the melt surface, bending the melt surface from the first melt groove and the second melt groove, A folding plate that folds and welds the distal end portion of the melting surface to the base end portion, and the folding plate pushes up the distal end portion of the melting surface from below and makes the melting surface perpendicular to the second melting groove. A first bent plate that bends in a second direction, a second bent plate that pushes up an intermediate portion between the first molten groove and the second molten groove from below, and a front end portion of the molten surface by pressing the front end portion of the molten surface downward. An end face processing apparatus for a hollow synthetic resin plate, comprising a third bent plate which is folded and welded to an end portion.   A hollow body synthetic resin plate end face processing apparatus in which a plurality of webs are integrally formed at equal intervals between liners on both sides, and a melt groove is formed in an end face processing portion facing an opening groove between the webs. Molded hot plate, bent plate that bends the tip from the molten groove at a right angle to form a bent portion, a cutter that cuts and removes the bent portion to a substantially front wall position leaving at least the back wall, cutting and removing A heating seal bar that melts the upper surface of the hollow body synthetic resin plate to a predetermined depth by an area of the remaining bent portion corresponding to the thickness of the remaining bent portion, and forms the molten surface, the residual bent portion An end surface treatment apparatus for a hollow synthetic resin plate, comprising: a second bent plate disposed so as to be displaceable in a horizontal direction in which the material is folded and welded to the melt surface.

Images