JP4875990B2

JP4875990B2 - Roof tile, molded product for roof tile and manufacturing method thereof

Info

Publication number: JP4875990B2
Application number: JP2007001430A
Authority: JP
Inventors: 武志宮園; 大輔石川
Original assignee: 株式会社宮園製作所; 新東株式会社
Priority date: 2007-01-09
Filing date: 2007-01-09
Publication date: 2012-02-15
Anticipated expiration: 2027-01-09
Also published as: JP2008168452A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roof tile which prevents a crack from being formed along the clay lump gathering surface of a projection part at the time of baking and enhances the yield of a product, a molded product for the roof tile and its manufacturing method. <P>SOLUTION: A first recessed place for molding a locking hook 13 on the molded product for the roof tile is formed to the pressing surface 33a of an upper mold 31 a ridge B1, which molds the groove arranged in the vicinity of the clay lump gathering surface avoiding the clay lump gathering surface, is formed to the pressing surface 35a of a lower mold 32. When a rough region 30 is extended into a cavity S at the time of pressing, the first recessed place is filled with clay which flows on the side of the upper pressing surface 33a and the projection B1 is bitten in the rough region 30 on the side of the lower pressing surface 35a at the same time to mold the groove. As the result, the molded locking hook 13 is hard to crack even if the molded product is baked. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、建築構造物の屋根仕上げに使用される各種屋根瓦、屋根瓦用成型品及びその製造方法に関するものである。 The present invention relates to various roof tiles used for roof finishing of building structures, molded products for roof tiles, and a method for manufacturing the same.

一般に屋根瓦は荒地（素地）と呼ばれる方形平板の粘土板を金型に挟んでプレス成型をすることで所望の形状の成型品を得るようになっている。このような荒地による屋根瓦製造技術の一例として特許文献１を示す。この特許文献１でもわかるように、屋根瓦用成型においては概ね瓦の外形形状に類似した荒地をプレスして粘土を金型のキャビティ内で延展させることで屋根瓦として備えなければならない段差部分や掛止部等の凹凸したパーツ部分を一体成型するわけである。成型した瓦は定法に従って乾燥、釉薬の塗布、再乾燥、焼成等の工程を経て選別され製品となる。
特開平１１−２９１２３２号公報 In general, a roof tile is obtained by pressing a rectangular flat plate called a wasteland (base) between molds to obtain a molded product having a desired shape. Patent document 1 is shown as an example of the roof tile manufacturing technique by such a wasteland. As can be seen from this patent document 1, in the roof tile molding, a stepped portion that must be provided as a roof tile by pressing a rough ground generally similar to the outer shape of the tile and extending the clay in the cavity of the mold. The uneven parts such as the hooks are integrally molded. The molded roof tiles are selected according to a conventional method through a process such as drying, applying a glaze, re-drying, firing, etc. to become a product.
Japanese Patent Laid-Open No. 11-291232

ところで、粘土は可塑性を有するものではあるが、屋根瓦用の粘土の水分含量は通常２０％前後に調整するためプレスした際の粘土の流動性はあまりよくない。また、元々荒地は瓦の外形に近似した形状であるため、プレス時におけるストローク量は比較的小さく、上下金型のプレス面が荒地に接してから数ｍｍ程度のわずかなストローク量（プレス量）に過ぎない。
そのため、屋根瓦の成型品の特に上記のパーツ部分（特に大きく突起するようなパーツ部分）では次のような状態が確認されている。
１）パーツ部分の粘土密度は本体部分に比べて若干小さくなる。
２）パーツ部分を構成するためのキャビティ内の凹所部分への粘土の流入量が十分ではなく若干変形が残留する場合がある。
３）同凹所部分には複数の方向から粘土が流入してくるが、それらは粘土塊としてそれぞれまとまっており他の粘土塊とは混ざりにくい。図１２（ａ）及び（ｂ）に示すように粘土の凹所部分への進出（ここでは上昇している）に伴って凹所内部に粘土塊Ｐ，Ｑ同士が背中合わせに密着してその界面に一種の境界面（以下、この境界面を粘土塊集合面とする）が形成されることとなる。
そして、これらのことが原因となって屋根瓦用成型品１００を焼成した際に図１２（ｃ）に示すように粘土塊集合面に沿ってひび１０１が入ってしまうケースが散見された。ひびが入った瓦は不良品として廃棄されるのでひびの有無は製品の歩留まりに大きく影響を与えることとなっていた。また、わずかなひびであればそのまま製品として出荷することも可能ではあるが、外観が劣ることとなってしまう。
本発明はこのような従来の技術に存在する問題点に着目してなされたものである。その目的とするところは、焼成の際に突起部の粘土塊集合面に沿ってひびが入るの防止し、製品の歩留まりを向上させることが可能な屋根瓦、屋根瓦用成型品及びその製造方法を提供することである。 By the way, although clay has plasticity, since the moisture content of clay for roof tiles is usually adjusted to around 20%, the fluidity of clay when pressed is not so good. Also, since the wasteland originally has a shape that approximates the outer shape of the roof tile, the stroke amount during pressing is relatively small, and a slight stroke amount (press amount) of about a few millimeters after the press surface of the upper and lower molds touches the wasteland. Only.
For this reason, the following states have been confirmed particularly in the above-described parts (parts that are particularly prominent) of the roof tile molding.
1) The clay density of the parts is slightly smaller than that of the main body.
2) The amount of clay flowing into the recessed portion in the cavity for constituting the part portion is not sufficient, and some deformation may remain.
3) Although clay flows into the concave part from a plurality of directions, they are gathered together as clay blocks and are difficult to mix with other clay blocks. As shown in FIGS. 12 (a) and 12 (b), as the clay advances into the concave portion (in this case, rises), the clay blocks P and Q are brought into close contact with each other inside the concave portion, and the interface therebetween. A kind of boundary surface (hereinafter, this boundary surface is referred to as a clay lump assembly surface) is formed.
As a result, when the molded article 100 for roof tiles was fired, there were some cases in which cracks 101 entered along the clay lump assembly surface as shown in FIG. Since cracked roof tiles are discarded as defective products, the presence or absence of cracks has had a major impact on product yield. In addition, a slight crack can be shipped as a product as it is, but the appearance will be inferior.
The present invention has been made paying attention to such problems existing in the prior art. The purpose of this is roof tile, molded product for roof tile, which can prevent cracks from forming along the clay lump assembly surface of the protrusion during firing, and improve the yield of the product, and method for manufacturing the roof tile Is to provide.

上記の目的を達成するために第１の手段では、平板状の粘土板を第１及び第２の金型によってプレス加工して所望の形状の屋根瓦用成型品を製造する屋根瓦用成型品の製造方法であって、前記第１の金型の第１のプレス面には前記屋根瓦用成型品に突起部を成型させるための周辺の基準面に対して窪んだ凹所を形成するとともに、前記第２の金型の第２のプレス面には同屋根瓦用成型品に凹部を成型するための周辺の基準面に対して突起した突起体を形成し、同第１及び第２の金型の間に前記粘土板を配置し、同第１及び第２の金型の相対的な接近に伴って同第１及び第２のプレス面によって同粘土板をプレスして延展させ、同プレス作用に伴って第１のプレス面側では流動する粘土を同凹所内に充填させていくと同時に同第２のプレス面側では同凹所内への粘土の充填に伴って形成される粘土塊集合面を避けた同粘土塊集合面の近傍位置で突起体を同粘土板に食い込ませるようにしたことをその要旨とする。
また、第２の手段では第１の手段に加え、プレス状態において前記第２のプレス面に形成した突起体は前記第１のプレス面に形成した凹所外方に配置された流路に面して配置されていることをその要旨とする。
また、第３の手段では、平板状の粘土板を第１及び第２の金型によってプレス加工して所望の形状の屋根瓦用成型品を製造する屋根瓦用成型品の製造方法であって、前記第１の金型の第１のプレス面には前記屋根瓦用成型品に突起部を成型させるための周辺の基準面に対して窪んだ凹所を形成し、同第１及び第２の金型の間に前記粘土板を配置し、同第１及び第２の金型の相対的な接近に伴って同第１及び第２のプレス面によって同粘土板をプレスして延展させ、同プレス作用に伴って第１のプレス面側では流動する粘土を同凹所内に充填させていくと同時に同凹所内への粘土の充填に伴って形成される粘土塊集合面を避けた同粘土塊集合面の近傍位置で突起体を同粘土板に食い込ませるようにしたことをその要旨とする。また、第４の手段では第３の手段に加え、プレス状態において前記第１のプレス面に形成した突起体は前記第１のプレス面に形成した凹所外方に配置された流路に面して配置されていることをその要旨とする。 In order to achieve the above object, according to a first means, a roof tile molded product for producing a roof tile molded product having a desired shape by pressing a flat clay plate with the first and second molds. In the manufacturing method of the first embodiment, the first press surface of the first mold is formed with a recess that is recessed with respect to a peripheral reference surface for forming a projection on the molded product for roof tile. The second press surface of the second mold is formed with a protrusion projecting from a peripheral reference surface for forming a recess in the molded product for roof tile, and the first and second The clay plate is disposed between the molds, and the clay plate is pressed and extended by the first and second pressing surfaces with the relative approach of the first and second molds. Along with the press action, the first press surface side is filled with fluid clay, and at the same time the second press surface side It is the gist that it has to bite into the projections on the clay plates in the vicinity of the same clay mass collection surface avoiding the clay mass collection surface formed with the filling of the clay into the recess.
Further, in the second means, in addition to the first means, the protrusion formed on the second press surface in the pressed state faces the flow path disposed outside the recess formed on the first press surface. It is the gist that it is arranged.
The third means is a method for producing a roof tile molded product, in which a flat clay plate is pressed by the first and second molds to produce a roof tile molded product having a desired shape. The first press surface of the first mold is formed with a recess that is recessed with respect to a peripheral reference surface for forming a protrusion on the roof tile molded product. The clay plate is disposed between the molds of the same, and the clay plate is pressed and extended by the first and second press surfaces as the first and second molds are relatively approached, With the press action, the clay is filled with fluid clay on the first press surface side, and at the same time, the clay avoiding the clay lump surface formed by filling the clay into the recess. The gist is that the protrusion is bitten into the clay plate in the vicinity of the lump assembly surface. Further, in the fourth means, in addition to the third means, the protrusion formed on the first press surface in the pressed state faces the flow path disposed outside the recess formed on the first press surface. It is the gist that it is arranged.

また、第５の手段では、平板状の粘土板を第１及び第２の金型によってプレス加工することで所望の形状に成型される屋根瓦用成型品において、表裏いずれかの面側にその周囲の基準面から外方に突起する突起部を形成するとともに、同突起部の形成側面とは異なる面側であって同突起部の粘土塊集合面を避けた同粘土塊集合面の近傍位置に凹部を形成したことをその要旨とする。
また、第６の手段では、平板状の粘土板を第１及び第２の金型によってプレス加工することで所望の形状に成型される屋根瓦用成型品において、表裏いずれかの面側にその周囲の基準面から外方に突起する突起部を形成するとともに、同突起部の形成側面側であって同突起部の粘土塊集合面を避けた同粘土塊集合面の近傍位置に凹部を形成したことをその要旨とする。
また、第７の手段では第５又は６の手段に加え、前記凹部は前記突起部の配置位置よりも外方に複数配置されているようにしたことをその要旨とする。
また、第８の手段では第５〜７のいずれかの手段に加え、前記複数の凹部は左右対称となる位置であって同突起部の粘土塊集合面から略等距離離間した位置に配置されていることをその要旨とする。
また、第９の手段では第５〜第８のいずれかの手段に加え、前記凹部は前記突起部の幅に長さが略一致する溝形状であることをその要旨とする。
また、第１０の手段では第９の手段に加え、前記溝形状の凹部は前記突起部に隣接する縁部と交叉する方向に延設されていることをその要旨とする。
また、第１１の手段では第５〜第１０のいずれかの手段に加え、屋根瓦は屋根瓦用成型品を焼成して得られることをその要旨とする。 Further, in the fifth means, in a roof tile molded product that is molded into a desired shape by pressing a flat clay plate with the first and second molds, Protrusion that protrudes outward from the surrounding reference surface, and a position near the clay lump assembly surface that is different from the formation side of the protrusion and avoids the lump assembly surface of the protrusion The gist is that a recess is formed on the surface.
Further, in the sixth means, in a roof tile molded product that is molded into a desired shape by pressing a flat clay plate with the first and second molds, Protrusions projecting outward from the surrounding reference surface are formed, and concave portions are formed in the vicinity of the clay lump assembly surface on the side surface where the projections are formed, avoiding the clay lump assembly surface of the projections This is the gist.
Further, the seventh means is characterized in that, in addition to the fifth or sixth means, a plurality of the concave portions are arranged outward from the arrangement position of the protrusions.
Further, in the eighth means, in addition to any one of the fifth to seventh means, the plurality of concave portions are arranged at positions that are symmetric with respect to each other and are separated from the clay lump assembly surface of the projection portions by a substantially equal distance. The gist of this is
The ninth means is characterized in that, in addition to any of the fifth to eighth means, the concave portion has a groove shape whose length substantially matches the width of the protrusion.
The tenth means is characterized in that, in addition to the ninth means, the groove-shaped recess extends in a direction crossing the edge adjacent to the protrusion.
In addition, the eleventh means is characterized in that, in addition to any of the fifth to tenth means, the roof tile is obtained by firing a molded product for roof tile.

上記第１の手段のような構成では、第１及び第２の金型の間に配置された粘土板は第１及び第２のプレス面によってプレスされ、延展されてキャビティ内に充満する。第１のプレス面に形成された凹所はプレス前は空隙とされ粘土は充填されていないが、粘土板がプレスされることでこの空隙内に粘土塊として流入されることとなる。プレス動作に伴って、つまり凹所内への粘土塊の流入に伴って同時に第２のプレス面に形成された突起体が粘土板に食い込むこととなる。突起体は粘土塊集合面を避けながらもその近傍位置に配置されているため、凹所に流入する粘土塊はこの突起体付近では一旦突起体を回り込むように流れることとなる。つまり、粘土塊は粘土塊集合面に至る前に従来のように速やかに凹所内を末端方向に向かって流動するのではなく他の粘土塊と衝突する方向に分散されることとなるため粘土塊集合面が生成されにくくなってこの面での剥離性が抑制されることとなる。 In the configuration like the first means, the clay plate disposed between the first and second molds is pressed by the first and second pressing surfaces, and is extended to fill the cavity. The recess formed in the first pressing surface is a gap before pressing and is not filled with clay, but when the clay plate is pressed, it flows into the gap as a clay lump. With the pressing operation, that is, with the inflow of the clay block into the recess, the protrusions formed on the second pressing surface simultaneously bite into the clay plate. Since the protrusions are arranged in the vicinity of the clay mass while avoiding the clay lump assembly surface, the clay lump flowing into the recess once flows around the protrusion in the vicinity of the protrusion. In other words, before reaching the clay lump assembly surface, the clay lump is dispersed in the direction of colliding with other clay lumps, rather than quickly flowing in the recess toward the end as in the past. The aggregate surface is hardly generated, and the peelability on this surface is suppressed.

このような方法で成型された屋根瓦用成型品は表裏いずれかの面側にその周囲の基準面から外方に突起する突起部が形成されるとともに、同突起部の形成側面とは異なる面側であって同突起部の粘土塊集合面を避けた同粘土塊集合面の近傍位置に凹部が形成されることとなる。このような屋根瓦用成型品を焼成すると粘土塊集合面の剥離性が抑制されているためひびが入りにくくなって製品歩留まりが向上する。ここに「基準面」とはひびを防止するために本発明が実行された突起部の同突起部に対して段違いに低い周囲の面をいうものである。突起部は表面（化粧面側）のみならず裏面側に突起する場合も含む。 The roof tile molded product molded in this way is formed with protrusions that protrude outward from the surrounding reference surface on either the front or back side, and a surface that is different from the side where the protrusions are formed On the side, a concave portion is formed at a position in the vicinity of the clay lump assembly surface that avoids the clay lump assembly surface of the protrusion. When such a molded product for roof tile is baked, the peelability of the clay lump assembly surface is suppressed, so that cracking is difficult to occur and the product yield is improved. Here, the “reference surface” refers to a peripheral surface that is unevenly lower than the protrusion of the protrusion on which the present invention has been implemented in order to prevent cracking. The protruding portion includes not only the front surface (decorative surface side) but also the rear surface side.

ここに、上記成型品は第２のプレス面に形成した突起部は第１のプレス面に形成した凹部の外方に配置された流路に面して配置されることが好ましい。つまり、粘土塊は複数の方向から空隙内に進入してくるので各粘土塊に対応すべく流入方向毎に凹部が形成されていること（つまり、第２のプレス面に形成された突起部の食い込み）が粘土塊集合面の剥離性の抑制のためには好ましい。そのため、成型される屋根瓦用成型品としてはその凹部が突起部を間に配置位置よりも外方に複数配置されることが好ましい。但し、単一の凹部であることを排除するものではない。そして、このような凹部は粘土塊集合面から略等距離離間した対称位置に配置されていることが好ましく、更に凹部は突起部の幅に略一致する溝形状であることが好ましい。その溝形状の凹部は前記突起部に隣接する縁部と交叉する方向に延設されていることが更に好ましい。 Here, in the molded product, the protrusion formed on the second press surface is preferably disposed facing the flow path disposed outside the recess formed on the first press surface. That is, since the clay lump enters the gap from a plurality of directions, a recess is formed in each inflow direction to correspond to each clay lump (that is, the protrusion formed on the second press surface). Biting) is preferable for suppressing the peelability of the clay lump assembly surface. Therefore, it is preferable that a plurality of concave portions of the molded article for roof tile to be molded are arranged outward from the arrangement position with the protrusions therebetween. However, this does not exclude a single recess. And such a recessed part is arrange | positioned in the symmetrical position spaced apart substantially equal distance from the clay lump assembly surface, and it is preferable that a recessed part is a groove | channel shape substantially corresponding to the width | variety of a projection part. More preferably, the groove-shaped recess extends in a direction intersecting with the edge adjacent to the protrusion.

また、上記第３の手段のような構成では、第１及び第２の金型の間に配置された粘土板は第１及び第２のプレス面によってプレスされ、延展されてキャビティ内に充満する。第１のプレス面に形成された凹所はプレス前は空隙とされ粘土は充填されていないが、粘土板がプレスされることでこの空隙内に粘土塊として流入されることとなる。プレス動作に伴って、つまり凹所内への粘土塊の流入に伴って同時に同じ第１のプレス面に形成された突起体が粘土板に食い込むこととなる。突起体は粘土塊集合面を避けながらもその近傍位置に配置されているため、凹所に流入する粘土塊はこの突起体付近では一旦突起体を回り込むように流れることとなる。つまり、粘土塊は粘土塊集合面に至る前に従来のように速やかに凹所内を末端方向に向かって流動するのではなく他の粘土塊と衝突する方向に分散されることとなるため粘土塊集合面が生成されにくくなってこの面での剥離性が抑制されることとなる。 Further, in the configuration like the third means, the clay plate disposed between the first and second molds is pressed by the first and second press surfaces and extended to fill the cavity. . The recess formed in the first pressing surface is a gap before pressing and is not filled with clay, but when the clay plate is pressed, it flows into the gap as a clay lump. With the pressing operation, that is, with the inflow of the clay lump into the recess, the protrusions formed on the same first pressing surface simultaneously bite into the clay plate. Since the protrusions are arranged in the vicinity of the clay mass while avoiding the clay lump assembly surface, the clay lump flowing into the recess once flows around the protrusion in the vicinity of the protrusion. In other words, before reaching the clay lump assembly surface, the clay lump is dispersed in the direction of colliding with other clay lumps, rather than quickly flowing in the recess toward the end as in the past. The aggregate surface is hardly generated, and the peelability on this surface is suppressed.

このような方法で成型された屋根瓦用成型品は表裏いずれかの面側にその周囲の基準面から外方に突起する突起部が形成されるとともに、同突起部の形成側側であって同突起部の粘土塊集合面を避けた同粘土塊集合面の近傍位置に凹部が形成されることとなる。このような屋根瓦用成型品を焼成すると粘土塊集合面の剥離性が抑制されているためひびが入りにくくなって製品歩留まりが向上する。ここに「基準面」とはひびを防止するために本発明が実行された突起部の同突起部に対して段違いに低い周囲の面をいうものである。突起部は表面（化粧面側）のみならず裏面側に突起する場合も含む。
この場合の成型品では突起部は第１のプレス面に形成した凹部の外方に配置された流路に面して配置されることが好ましい。つまり、粘土塊は複数の方向から空隙内に進入してくるので各粘土塊に対応すべく流入方向毎に凹部が形成されていること（つまり、第１のプレス面に形成された突起部の食い込み）が粘土塊集合面の剥離性の抑制のためには好ましい。そのため、成型される屋根瓦用成型品としてはその凹部が突起部を間に配置位置よりも外方に複数配置されることが好ましい。但し、単一の凹部であることを排除するものではない。そして、このような凹部は粘土塊集合面から略等距離離間した対称位置に配置されていることが好ましく、更に凹部は突起部の幅に略一致する溝形状であることが好ましい。その溝形状の凹部は前記突起部の縁部と交叉する方向に延設されていることが更に好ましい。 The roof tile molded product molded by such a method has a protruding portion that protrudes outward from the surrounding reference surface on either the front or back surface side, and is on the forming side of the protruding portion. A concave portion is formed in the vicinity of the clay lump assembly surface avoiding the clay lump assembly surface of the projection. When such a molded product for roof tile is baked, the peelability of the clay lump assembly surface is suppressed, so that cracking is difficult to occur and the product yield is improved. Here, the “reference surface” refers to a peripheral surface that is unevenly lower than the protrusion of the protrusion on which the present invention has been implemented in order to prevent cracking. The protruding portion includes not only the front surface (decorative surface side) but also the rear surface side.
In the molded product in this case, it is preferable that the protruding portion is disposed facing the flow path disposed outside the concave portion formed on the first press surface. That is, since the clay lump enters the gap from a plurality of directions, a recess is formed in each inflow direction to correspond to each clay lump (that is, the protrusion formed on the first press surface). Biting) is preferable for suppressing the peelability of the clay lump assembly surface. Therefore, it is preferable that a plurality of concave portions of the molded article for roof tile to be molded are arranged outward from the arrangement position with the protrusions therebetween. However, this does not exclude a single recess. And such a recessed part is arrange | positioned in the symmetrical position spaced apart substantially equal distance from the clay lump assembly surface, Furthermore, it is preferable that a recessed part is a groove | channel shape substantially corresponded to the width | variety of a projection part. It is more preferable that the groove-shaped recess extends in a direction intersecting with the edge of the protrusion.

上記各請求項の発明によれば、成型された屋根瓦用成型品を焼成する際に突起部分にひびが入りにくくなるため、製品の見栄えがよく、なおかつ製品の歩留まりを向上させることが可能となる。 According to the inventions of the above-mentioned claims, when the molded roof tile molded product is fired, it is difficult for the protrusions to crack, so that the appearance of the product is good and the yield of the product can be improved. Become.

以下、本発明の実施例について図面に基づいて説明する。尚、以下の説明において左右と言う場合は焼成した製品としての屋根瓦を葺いた状態における桁行き方向をいうものとする。また、屋根の流れ方向における軒側を前又は下とし、棟側を後又は上とするものとする。
図１〜図４に示すように、屋根瓦用成型品としての本実施例の平瓦用成型品１は平面略長方形形状をなした粘土製の板体とされている。平瓦用成型品１は大きく分けて瓦本体３と瓦本体３の左右両側に張り出し形成された衿側及び桟側の側縁部４,５の３つの部分から構成されている。このような左右方向の構成とは別に平瓦用成型品１の棟側を向いた後端寄りが尻側とされ軒側を向いた先端寄りが頭側とされている。尻及び頭は平瓦用成型品１において画一的に区切られるものではないが、本実施例では上位の屋根瓦１が下位の屋根瓦１とオーバーラップする図１におけるＰ部分付近を尻部７とし、このＰ部分とオーバーラップするＱ部分付近を頭部８とする。頭部８側は先端ほど下垂するように湾曲状に成型されている。 Embodiments of the present invention will be described below with reference to the drawings. In the following description, the term “left and right” refers to the direction of girder in a state where the roof tiles are burned as a fired product. In addition, the eaves side in the flow direction of the roof is the front or the bottom, and the ridge side is the back or the top.
As shown in FIGS. 1 to 4, the flat tile molded article 1 of the present embodiment as a roof tile molded article is a clay plate body having a substantially rectangular plane shape. The flat tile molded product 1 is roughly divided into three parts: a tile main body 3 and side edges 4 and 5 on the side of the roof and the side of the bridge main body 3 which are formed to protrude from the left and right sides of the tile main body 3. Apart from such a configuration in the left-right direction, the rear end side facing the ridge side of the flat tile molded article 1 is the buttocks side and the front end side facing the eaves side is the head side. The bottom and head are not uniformly divided in the flat tile molded article 1, but in this embodiment, the upper roof tile 1 overlaps the lower roof tile 1 and the vicinity of the P portion in FIG. 7 and the vicinity of the Q portion that overlaps the P portion is the head 8. The head 8 side is formed in a curved shape so as to hang down toward the tip.

瓦本体３は衿側及び桟側の側縁部４,５に挟持された平面長方形形状の外観を呈する一定の肉厚に形成された板体とされ、図１及び図３等に示すように、瓦本体３の左右方向中央位置には尻部７近傍から頭部８最先端にかけて瓦本体３に対して上方に凸状に隆起した凸状部９が形成されている。すなわち瓦本体３のベース面Ｂに対して凸状部９の上面ｂ１は一段高い位置に配置されることとなる（図３参照）。凸状部９は裏面から見た場合には表面側に隆起した分だけ凹んで構成されている。凸状部９は平瓦用成型品１の強度アップを図るとともに焼成後の平瓦を屋根に葺き上げた際に下位の平瓦のオーバーラップした側縁部４,５が納まる空間を構成する。瓦本体３の衿側の側縁部４との境界部分には前後に延びる堤部１０が上方に盛り上がるように形成されている。
尻部７側の最後端位置には左右方向に沿って瓦本体３に対して段違となるよう隆起した段差部１１が形成されている。段差部１１の後方には左右一対の三角形形状の尻剣部１４が下方に向かって突出形成されている。
図１図４及び図５等に示すように、段差部１１の上面の尻側後端縁１２に面した位置であって左右方向の中央位置から僅かに衿側の側縁部４に寄った位置には突起部としての係合フック１３が形成されている。係合フック１３は立ち上げ部１３ａとフック部１３ｂから構成されている。係合フック１３は前後方向が同幅に構成されるとともに立ち上げ部１３ａでは左右方向において基部側が肉厚とされ上部寄りほど徐々に薄肉となるようにテーパ状に構成されている。フック部１３ｂはその先端方向が衿側の側縁部４の方向に指向して段差部１１の上面に対して略水平となるように延出されている。 The tile body 3 is a plate body having a constant thickness and having a flat rectangular shape sandwiched between the side edges 4 and 5 on the ridge side and the crosspiece side, as shown in FIGS. A convex portion 9 is formed at the central position in the left-right direction of the roof tile 3 so as to protrude upward in a convex shape from the vicinity of the bottom 7 to the forefront of the head 8. That is, the upper surface b1 of the convex portion 9 is arranged at a position higher than the base surface B of the roof tile body 3 (see FIG. 3). The convex portion 9 is configured to be recessed by an amount protruding from the front surface side when viewed from the back surface. The convex portion 9 is intended to increase the strength of the flat tile molded article 1 and to form a space in which the overlapped side edge portions 4 and 5 of the lower flat tile are accommodated when the fired flat tile is rolled up on the roof. . A bank portion 10 extending in the front-rear direction is formed so as to rise upward at a boundary portion between the tile body 3 and the side edge portion 4 on the heel side.
A stepped portion 11 is formed at the rearmost end position on the side of the buttocks 7 so as to be raised with respect to the roof tile body 3 along the left-right direction. A pair of left and right triangular sword portions 14 are formed on the rear side of the step portion 11 so as to protrude downward.
As shown in FIGS. 1, 4, and 5, the position facing the rear end edge 12 on the bottom side of the upper surface of the stepped portion 11, and slightly shifted from the center position in the left-right direction to the side edge 4 on the heel side At the position, an engagement hook 13 is formed as a protrusion. The engagement hook 13 includes a rising portion 13a and a hook portion 13b. The engagement hook 13 is configured to have the same width in the front-rear direction, and the rising portion 13a is configured to be tapered so that the base side is thick in the left-right direction and gradually becomes thinner toward the top. The hook portion 13b extends so that the tip direction thereof is directed in the direction of the side edge portion 4 on the heel side and is substantially horizontal with respect to the upper surface of the step portion 11.

係合フック１３の形成されている段差部１１上の厚みｍは基準となる周囲の厚みＭよりも薄肉に形成されている。つまり、図５〜図８に示すように、係合フック１３の裏面側には凹部１５が形成されている。凹部１５は尻側後端縁１２方向のみが開放された三方から包囲された略方形の形状とされている。凹部１５の前後長さは係合フック１３の幅と略一致されている。凹部１５の左右両縁にはそれぞれ前後方向に延びる同幅の第１の溝１６が尻側後端縁１２に対して直交して延出されている。図６に示すように、第１の溝１６は係合フック１３の中心線（つまり略粘土塊集合面）Ｏから等距離に配置されている。段差部１１には左右一対の透孔１７が形成されている。透孔１７は屋根瓦として葺く際に釘を桟木に打ち込んで固定するための孔となる。
段差部１１には尻剣部１４を成型するために瓦本体３のベース面Ｂとの間がスペース的に幅狭に構成された尾根部２１が形成されている。尾根部２１の左右両端寄りにはそれぞれ前後方向に延びる同幅の第２の溝２２が尾根部２１を構成する壁面の延出方向に対して直交して延出されている。 The thickness m on the step portion 11 where the engagement hook 13 is formed is thinner than the surrounding thickness M serving as a reference. That is, as shown in FIGS. 5 to 8, the recess 15 is formed on the back side of the engagement hook 13. The recess 15 has a substantially square shape surrounded from three sides where only the rear end edge 12 direction is opened. The front-rear length of the recess 15 is substantially the same as the width of the engagement hook 13. A first groove 16 having the same width extending in the front-rear direction is extended at right and left edges of the recess 15 so as to be orthogonal to the rear end edge 12. As shown in FIG. 6, the first groove 16 is disposed at an equal distance from the center line (that is, the substantially clay lump assembly surface) O of the engagement hook 13. A pair of left and right through holes 17 are formed in the step portion 11. The through-hole 17 serves as a hole for driving a nail into a pier when fixing it as a roof tile.
In the step portion 11, a ridge portion 21 is formed that is narrow in space with the base surface B of the roof tile body 3 in order to mold the bottom sword portion 14. Near the left and right ends of the ridge portion 21, second grooves 22 having the same width extending in the front-rear direction are extended perpendicular to the extending direction of the wall surface constituting the ridge portion 21.

衿側の側縁部４は瓦本体３の一方の側縁において前後に延びる長尺の長方形形状の板片とされ、その上面ｂ２は瓦本体３のベース面Ｂよりも若干低い位置に配置される（図３参照）。側縁部４の上端縁から側縁にかけて同側縁部４を包囲する包囲壁１８が一体形成されており、前記瓦本体３側の堤部１０との間で三方が包囲された樋が構成される。
桟側の側縁部５は瓦本体３の他方の側縁において前後に延びる長尺の長方形形状の板片とされている。桟側の側縁部５は前記凸状部９と略同等の幅とされている。同側縁部５は衿側の側縁部４の上面にオーバーラップして配置されるため本実施例では前記凸状部９と同程度の位置に配置される。すなわち瓦本体３のベース面Ｂに対して桟側の側縁部５の上面ｂ３は一段高い位置に配置されることとなる（図３参照）。
図２に示すように、桟側の側縁部５の裏面側であって先端寄りの最深部、すなわち桟側の側縁部５裏面に面した瓦本体３の側壁１９には係合部としての横長の係合凹部２０が形成されている。 The side edge 4 on the heel side is a long rectangular plate piece extending forward and backward at one side edge of the roof tile body 3, and its upper surface b 2 is arranged at a position slightly lower than the base surface B of the roof tile body 3. (See FIG. 3). A surrounding wall 18 that surrounds the side edge 4 is formed integrally from the upper edge to the side edge of the side edge 4, and a fence that is surrounded on three sides with the bank 10 on the side of the tile body 3 is configured. Is done.
The side edge portion 5 on the crosspiece side is a long rectangular plate piece extending forward and backward at the other side edge of the tile body 3. The side edge portion 5 on the crosspiece side has a width substantially equal to that of the convex portion 9. Since the same side edge portion 5 is disposed so as to overlap with the upper surface of the side edge portion 4 on the heel side, in this embodiment, it is disposed at the same position as the convex portion 9. That is, the upper surface b3 of the side edge part 5 on the side of the crosspiece with respect to the base surface B of the roof tile body 3 is arranged at a position one step higher (see FIG. 3).
As shown in FIG. 2, the side wall 19 of the roof tile body 3 facing the back surface of the side edge 5 on the side of the rail and facing the deepest part near the tip, that is, the back of the side edge 5 on the side of the rail is an engaging portion. The horizontally long engaging recess 20 is formed.

次にこのように構成される平瓦用成型品１の成型方法の一例について説明する。本実施例では特に段差部１１の成型状況を一例として図示して説明する。
図９及び図１０に示すように、平瓦用成型品１は一定の厚みに平面方形形状に成型された荒地３０をプレス装置内の上下の金型３１，３２の間に配置しプレスすることで得られる。
上側金型３１は金型本体３３を備えている。金型本体３３の底面には上型プレス面３３ａが形成されている。金型本体３３の前後には上型側側板３４（本実施例では金型３１，３２内部を目視させるため手前側の側板は図示を省略している）が取着されている。
下側金型３２は金型本体３５を備えている。金型本体３５の上面には下型プレス面３５ａが形成されている。金型本体３５の左右には下型側側板３７が取着されている。上型プレス面３３ａは平瓦用成型品１の表面を成型し、下型プレス面３５ａは裏面を成型する。
すなわち、上側金型３１が下降して所定の位置で停止することで両金型３１，３２及び上下側板３４，３７によって密封されたキャビティＳが形成される。そして、そのキャビティＳ内高さが荒地３０の厚みよりも低いことから荒地３０はプレス面３３ａ，３５ａによってプレスされキャビティＳ内面形状に応じて延展して変形し所望の平瓦用成型品１に成型されることとなる。尚、本実施例では上側金型３１を駆動するためのプレス装置の駆動機構や荒地３０をセットするための搬入機構等の説明は省略する。また、図９及び図１０においては平瓦用成型品１の段差部１１部分を成型する場合を図示説明する。 Next, an example of a molding method of the flat roof molded article 1 configured as described above will be described. In this embodiment, the molding state of the step portion 11 will be illustrated and described as an example.
As shown in FIGS. 9 and 10, the flat tile molded product 1 is arranged by pressing a rough ground 30 formed into a flat rectangular shape with a constant thickness between upper and lower molds 31 and 32 in a press device. It is obtained by.
The upper mold 31 includes a mold body 33. An upper mold press surface 33 a is formed on the bottom surface of the mold body 33. An upper mold side plate 34 (in the present embodiment, the side plates on the front side are not shown in order to make the inside of the molds 31 and 32 visible) is attached to the front and rear of the mold body 33.
The lower mold 32 includes a mold body 35. A lower die press surface 35 a is formed on the upper surface of the mold body 35. Lower mold side plates 37 are attached to the left and right sides of the mold body 35. The upper mold press surface 33a molds the surface of the flat tile molded article 1, and the lower mold press surface 35a molds the back surface.
That is, when the upper mold 31 is lowered and stopped at a predetermined position, the cavity S sealed by the both molds 31 and 32 and the upper and lower plates 34 and 37 is formed. And since the height in the cavity S is lower than the thickness of the wasteland 30, the wasteland 30 is pressed by the press surfaces 33 a and 35 a, extends and deforms according to the shape of the inner surface of the cavity S, and becomes a desired flat tile molded product 1. It will be molded. In the present embodiment, the description of the drive mechanism of the press device for driving the upper mold 31 and the carry-in mechanism for setting the wasteland 30 is omitted. 9 and 10 illustrate the case where the step portion 11 of the flat roof molded article 1 is molded.

両プレス面３３ａ、３５ａには段差部１１を構成するための凹凸が形成されている。具体的には本実施例では上型プレス面３３ａには段差部１１上面となる基準面Ａ０の他に係合フック１３用の第１の凹所Ａ１、堤部１０用の第２の凹所Ａ２、尻剣部１４用の第１の突部Ａ３、衿側の側縁部４及び包囲壁１８用の第２の突部Ａ４、桟側の側縁部５用の第１の押圧部Ａ５、尾根部２１の第２の溝２２用の一対の突条Ａ６等が形成されている。下型プレス面３５ａには裏面となる基準面Ｂ０の他に係合フック１３の左右に配置される第１の溝１６用の一対の突条Ｂ１、両突条Ｂ１の間の第２の押圧部Ｂ２，堤部１０用の第１の突部Ｂ３、尻剣部１４用の第３の凹所Ｂ４、衿側の側縁部４底部用の第２の凹所Ｂ５、桟側の側縁部５用の第３の押圧部Ｂ６等が形成されている。
上側金型３１が下降していき、まず第１の突部Ａ３や第２の突部Ａ４のような下方に突起した部分が荒地３０に当接して荒地３０の延展が開始される。尚、プレスに伴って図示しない吸引バルブからキャビティＳ内の脱気処理が同時に行われる。延展された粘土はキャビティＳ内の内部形状に従って流動して平瓦用成型品１を成型する。 Concavities and convexities for forming the step portion 11 are formed on both the press surfaces 33a and 35a. More specifically, in this embodiment, the upper die press surface 33a has a first recess A1 for the engaging hook 13 and a second recess for the bank portion 10, in addition to the reference surface A0 that is the upper surface of the step portion 11. A 2, first protrusion A 3 for the sword section 14, second protrusion A 4 for the side edge 4 on the heel side and the surrounding wall 18, and first pressing part A 5 for the side edge 5 on the crosspiece side A pair of ridges A6 and the like for the second groove 22 of the ridge portion 21 are formed. The lower die press surface 35a has a pair of protrusions B1 for the first groove 16 disposed on the left and right sides of the engagement hook 13 in addition to the reference surface B0 serving as the back surface, and a second press between the protrusions B1. Part B2, first protrusion B3 for the bank 10, a third recess B4 for the sword part 14, a second recess B5 for the bottom side edge 4 and the side edge on the crosspiece side A third pressing portion B6 for the portion 5 is formed.
The upper mold 31 is lowered, and first, a portion projecting downward, such as the first protrusion A3 and the second protrusion A4, comes into contact with the wasteland 30 and the extension of the wasteland 30 is started. In addition, the deaeration process in the cavity S is simultaneously performed from a suction valve (not shown) with the press. The spread clay flows according to the internal shape in the cavity S to mold the flat tile molding 1.

ここに、概ね荒地３０が屈曲されたりわずかに凹凸となる程度の部分、具体的には段差部１１や側縁部４，５や尻剣部１４等のパーツ部分であればプレスによって延展された粘土は当該パーツ部分を成型するキャビティＳ内に空隙に十分回るため一般にはこれらパーツ部分にひびの問題は生じない。
ところが、特に係合フック１３のような局部的に大きく突起したパーツ部分を成型する場合では上記のように図１２（ｃ）のように焼成した際にその下面にひびが生じやすくなる。尾根部２１も同様に焼成した際にその上面にひびが生じやすくなる。
しかしながら、本実施例では成型された平瓦用成型品１を焼成しても係合フック１３及び尾根部２１ともにそのようなひびが入りにくい構造となっている。その理由について係合フック１３の場合を例に説明する。
図１１（ａ）に示すように、キャビティＳ内のちょうどこの係合フック１３が成型される箇所では両側から第１の凹所Ａ１内に粘土塊Ｐ，Ｑが押し寄せてくることとなる。そのため、両者の界面には粘土塊集合面が形成されることとなる。
ここに、第１の凹所Ａ１に至るその左右の通路（係合フック１３の左右の段差部１１となる部分）に対して左右の突条Ｂ１位置では上下幅が狭くなっている。そのため、この狭窄した通路部分を通過する際には速度が若干速くなる。更に、突条Ｂ１に近い粘土は図１１（ｂ）に示すように上昇せずに一旦突条Ｂ１を巻き込むように下方側に向かって流れることとなる。そのため、粘土塊Ｐ，Ｑは比較的明瞭な粘土塊集合面を形成せず従来に較べて強く密着した状態で係合フック１３を成型することとなる。係合フック１３についてこのように成型された平瓦用成型品１では焼成しても図１２（ｃ）のように係合フック１３の下面側（裏側）にひびが入りにくくなる。また、尾根部２１でも係合フック１３と同様の作用によってその上面にひびが入りにくくなる。 Here, the portion where the rough ground 30 is bent or slightly uneven, specifically the parts such as the step portion 11, the side edge portions 4, 5, and the sword portion 14, is extended by a press. Since the clay is sufficiently rotated into the gap in the cavity S for molding the part part, generally, there is no problem of cracks in the part part.
However, especially when molding a part that protrudes locally, such as the engagement hook 13, cracking is likely to occur on the lower surface when firing as shown in FIG. 12C. The ridge portion 21 is also likely to crack on its upper surface when fired in the same manner.
However, in this embodiment, even when the molded flat tile molded product 1 is fired, both the engagement hook 13 and the ridge portion 21 have a structure in which such cracks are difficult to enter. The reason will be described taking the case of the engagement hook 13 as an example.
As shown in FIG. 11 (a), at the place where the engagement hook 13 is formed in the cavity S, the clay blocks P and Q are pushed into the first recess A1 from both sides. Therefore, a clay block aggregate surface is formed at the interface between the two.
Here, the vertical width is narrow at the left and right ridges B1 relative to the left and right passages (the portions that become the left and right step portions 11 of the engagement hook 13) that reach the first recess A1. Therefore, the speed is slightly increased when passing through the narrowed passage portion. Furthermore, the clay close to the ridge B1 does not rise as shown in FIG. 11 (b), but flows toward the lower side so as to engulf the ridge B1 once. For this reason, the clay blocks P and Q do not form a relatively clear clay block aggregate surface, and the engaging hooks 13 are molded in a state of being closely adhered as compared with the prior art. With the flat roof molded article 1 molded in this way with respect to the engagement hook 13, even when fired, cracks are less likely to occur on the lower surface side (back side) of the engagement hook 13 as shown in FIG. Further, the ridge portion 21 is less likely to crack on the upper surface by the same action as the engagement hook 13.

このように構成することで上記実施例では次のような効果が奏される。
（１）従来のような成型方法で成型された瓦用成型品を焼成すると図１２（ｃ）のように裏側に粘土塊集合面に沿ってひびが入りやすくなってしまうところ、上記のように成型時に突条Ａ６，Ｂ１を荒地３０に食い込ませるようにしているため、明瞭な粘土塊集合面が生成されにくくなり粘土塊同士の密着性がよくなるためひびが入りにくくなる。その結果、焼成した製品の見栄えがよく、歩留まりも向上する。
（２）プレスの際に粘土が係合フック１３を成型する空隙に流入する際に狭い流路を通過することとなるため当該箇所での通過速度を速めることとなり、特に突条Ｂ１寄りを通過する粘土は他の粘土塊と強く衝突してよりしっかりと密着することとなる。 With this configuration, the following effects are achieved in the above embodiment.
(1) When a molded article for roof tiles molded by a conventional molding method is baked, cracks are likely to be formed along the clay lump as shown in FIG. 12 (c). Since the protrusions A6 and B1 are made to bite into the wasteland 30 at the time of molding, a clear clay lump aggregate surface is hardly generated and the adhesion between the clay lumps is improved, so that cracks are hardly formed. As a result, the baked product looks good and the yield is improved.
(2) During the pressing, when clay flows into the gap forming the engagement hook 13, it passes through a narrow flow path, so that the passing speed at that point is increased, and in particular, it passes near the ridge B1. The clay will collide strongly with other clay masses and will adhere more firmly.

尚、この発明は、次のように変更して具体化することも可能である。
・上記各実施例では係合フック１３におけるひびを防止する一例を説明したが、係合フック１３以外の突起部のひびを防止するために本発明を適用するようにしてももちろん構わない。
・溝１６の形状や数、更に位置については上記実施例に限定されるものではない。つまり、金型３２の金型本体３５の突条Ａ６，Ｂ１の形状や数、更に位置も上記に限定されるものではない。
その他本発明の趣旨を逸脱しない範囲で変更した態様で実施することは自由である。 It should be noted that the present invention can be modified and embodied as follows.
In each of the above embodiments, an example of preventing a crack in the engagement hook 13 has been described, but it is needless to say that the present invention may be applied in order to prevent a protrusion other than the engagement hook 13 from cracking.
The shape, number, and position of the groove 16 are not limited to the above embodiment. That is, the shape, number, and position of the protrusions A6 and B1 of the mold body 35 of the mold 32 are not limited to the above.
In addition, it is free to implement in a modified form without departing from the spirit of the present invention.

本発明の実施例の屋根瓦用成型品の斜視図。The perspective view of the molded product for roof tiles of the Example of this invention. 同じ成型品の側面図。Side view of the same molded product. 図２のＡ−Ａ線における縦断面図。The longitudinal cross-sectional view in the AA line of FIG. 同じ成型品の背面図。Rear view of the same molded product. 同じ成型品の背面方向からの部分拡大斜視図。The partial expansion perspective view from the back direction of the same molded product. 図７のＢ−Ｂ線と直交する方向における係合フック周辺の部分横断面図。FIG. 8 is a partial cross-sectional view around an engagement hook in a direction orthogonal to the line BB in FIG. 7. 図４のＢ−Ｂ線における係合フック周辺の部分縦断面図。The fragmentary longitudinal cross-section of the engagement hook periphery in the BB line of FIG. 同じ成型品の係合フック周辺の部分底面図。The partial bottom view around the engagement hook of the same molded product. プレス装置内の上下金型の間に荒地を配置した状態であってプレスする前の状態を説明する概略説明図。Schematic explanatory drawing explaining the state before pressing, in the state which arranged the rough ground between the upper and lower metal mold | dies in a press apparatus. プレス装置内の上下金型によって荒地をプレスした状態を説明する概略説明図。Schematic explanatory drawing explaining the state which pressed the wasteland with the up-and-down metal mold | die in a press apparatus. （ａ）はキャビティ内の係合フック用の空隙内に粘土塊が流入する状態を説明する説明図、（ｂ）は同じく空隙内に粘土が充填された状態を説明する説明図、（ｃ）は成型された係合フック周辺の背面図。(A) is explanatory drawing explaining the state in which a clay lump flows into the space | gap for engagement hooks in a cavity, (b) is explanatory drawing explaining the state with which clay was similarly filled in the space | gap, (c). FIG. 4 is a rear view around the molded engagement hook. （ａ）は従来のキャビティ内の係合フック用の空隙内に粘土塊が流入する状態を説明する説明図、（ｂ）は同じく空隙内に粘土が充填された状態を説明する説明図、（ｃ）は従来の製法で成型された係合フック周辺の背面図（ひびが入った状態）。(A) is explanatory drawing explaining the state which a clay lump flows in the clearance gap for engagement hooks in the conventional cavity, (b) is explanatory drawing explaining the state with which clay was similarly filled in the clearance gap, c) is a rear view (in a cracked state) around an engaging hook molded by a conventional manufacturing method.

Explanation of symbols

１…屋根瓦用成型品、１３…突起部としての係合フック、１６，２２…凹部としての溝、３０…粘土板としての荒地、３１…第１の金型としての上側金型、３２…第２の金型としての下側金型、３３ａ…第１のプレス面としての上型プレス面、３５ａ…第２のプレス面としての下型プレス面、Ａ１…凹所としての第１の凹所、Ａ６，Ｂ１…突起体としての突条。 DESCRIPTION OF SYMBOLS 1 ... Molded product for roof tiles, 13 ... Engagement hook as a projection part, 16, 22 ... Groove as a recessed part, 30 ... Wasteland as a clay board, 31 ... Upper mold | die as a 1st metal mold, 32 ... Lower mold as a second mold, 33a... Upper mold press surface as a first press surface, 35a. Lower mold press surface as a second press surface, A1... First recess as a recess A6, B1, ... ridges as protrusions.

Claims

A method for producing a roof tile molded article, in which a flat clay plate is pressed by first and second molds to produce a roof tile molded article having a desired shape,
The first press surface of the first mold is formed with a recess that is recessed with respect to a peripheral reference surface for forming a projection on the roof tile molded product, and the second mold. The second press surface is formed with a protrusion that protrudes from a peripheral reference surface for forming a recess in the roof tile molding.
The clay plate is disposed between the first and second molds, and the clay plate is moved by the first and second press surfaces as the first and second molds are relatively approached. Press and extend,
Along with the press action, the clay that is flowing on the first press surface side is filled into the recess, and at the same time, the clay that is formed as the clay is filled in the recess on the second press surface side. A method for producing a molded product for roof tiles, characterized in that protrusions are caused to bite into the clay plate in the vicinity of the clay lump collecting surface avoiding the lump collecting surface.

The protrusion formed on the second press surface in the pressed state is disposed to face a flow path disposed outside a recess formed on the first press surface. A method for producing a molded article for roof tile as described in 1.

A method for producing a roof tile molded article, in which a flat clay plate is pressed by first and second molds to produce a roof tile molded article having a desired shape,
Forming a recess recessed in the first press surface of the first mold with respect to a peripheral reference surface for forming a protrusion on the molded product for roof tile,
The clay plate is disposed between the first and second molds, and the clay plate is moved by the first and second press surfaces as the first and second molds are relatively approached. Press and extend,
With the press action, the clay is filled with fluid clay on the first press surface side, and at the same time, the clay avoiding the clay lump surface formed by filling the clay into the recess. A method for producing a molded product for roof tiles, characterized in that a protrusion is made to bite into the clay plate in the vicinity of the lump assembly surface.

In roof tile moldings molded into a desired shape by pressing a flat clay plate with the first and second molds,
Protrusions projecting outward from the surrounding reference surface are formed on either the front or back surface side, and the side where the projections are formed is different from the side of the surface and avoids the lump of clay mass A molded product for roof tiles, characterized in that a recess is formed in the vicinity of the aggregated surface of the clay block.

In roof tile moldings molded into a desired shape by pressing a flat clay plate with the first and second molds,
Forming protrusions that protrude outward from the surrounding reference surface on either the front or back side, and the same lump assembling on the side where the protrusion is formed, avoiding the lump surface of the protrusion A molded product for roof tiles, characterized in that a recess is formed in the vicinity of the surface.

The molded product for roof tile according to claim 4 or 5, wherein a plurality of the concave portions are arranged outward from the arrangement position of the protrusions.

The molded product for roof tile according to claim 6, wherein the plurality of recesses are arranged at positions that are symmetrical with respect to each other and that are spaced apart from each other by a substantially equal distance from the clay lump assembly surface.

A roof tile obtained by firing the molded article for roof tile according to claim 4.