JP2000309331A - Packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively and with high efficiency manufacture a packaging container on which bending flange sections are formed flat and cover seals can be applied on the upper faces of the flanges. SOLUTION: A polyhedron packaging container is formed of a square sheet SS1 and provided with flat flanges F1 on its peripheral faces and given dimensions of vertical, horizontal length, and long height and short height. The square sheet is provided with first root folding. lines V2-V3 passing through four corners C1-C4 of a polyhedron bottom face B1 having the given vertical and horizontal dimensions provided with the short height dimensions and the flange dimension FF1, second root folding lines V4-V5 crossing orthogonally two first root folding lines and provided with the given vertical and horizontal length connecting four corners, crest folding lines M3-M6 of same length as the given vertical and horizontal dimension lengths connecting four corners and the long height dimension in parallel with the first and second root folding lines, a crest folding line M7 extended from the second root folding lines, a root folding line V6 extended from the two crest lines of same length as the vertical dimension length and a crest folding line M8 extended from a triangle top in parallel with the first root folding lines.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container, in particular, a bent flange portion is flattened, and a lid seal such as a transparent film can be adhered to the upper surface of the flange by fusing or an adhesive. The present invention relates to a packaging container which is inexpensive to manufacture and can be manufactured with high efficiency.

2. Description of the Related Art Conventionally, packaging containers have been formed of a film, synthetic paper, or resin material by using a molding die. In this method of forming a packaging container, a molding die is expensive, and when preparing various types of packaging containers, expensive molding dies must be created for each, so that time conditions and economic burden increase. For this reason, one rectangular sheet is cut from a sheet such as a band-shaped film or paper conveyed in the longitudinal direction, and the first, second, third external folding lines, first, and second rectangular sheets are cut into the square sheet. There has been known a packaging container obtained by forming a third step-folded line and a ridge-shaped line and forming a stepped flange on the peripheral surface of the tray (Japanese Patent Application Laid-Open No. 6-72425). Also, a packaging technique for forming a tray carton having a flange on the peripheral surface of a tray from one carton blank (Japanese Patent Laid-Open No. 60-240444) is known.

However, in the packaging container disclosed in these patent publications,
In the former case, there is a problem that it is difficult to attach a lid seal such as a transparent film to the upper surface of the flange by fusing or pressure-sensitive adhesive because the flange portion becomes a step and does not become flat. In the latter case, the periphery of the carton blank forming a tray carton having a flange on the tray peripheral surface must be cut, and there is a possibility that cut chips may enter the inside of the tray carton, such as food and drink. Is not suitable as a packaging container for storing the The present invention has been made to solve such a problem, and the bent flange portion is formed flat so that a lid seal such as a transparent film can be attached to the upper surface of the flange, thereby reducing the manufacturing cost. It is an object of the present invention to provide a packaging container which can be manufactured with high efficiency.

A packaging container according to the present invention for achieving the above object is formed from a square sheet,
A bottom surface having predetermined vertical and horizontal dimensions, a pair of long sides facing each other having a predetermined length and height, a pair of short sides facing each other having a predetermined short height, and one side having a valley fold line. A polyhedron having a flange formed of two pairs of opposed triangular slopes connected to the side surface and having two vertices formed by two mountain fold lines and having the height of the short side as the height of the short side, and a peripheral surface formed of a continuous surface. Packaging container, wherein a square sheet is formed with two short corners and flanges which pass through four corner points of the bottom face of a polyhedron having predetermined vertical and horizontal dimensions. Two second valley fold lines formed with predetermined vertical and horizontal dimension lengths which are orthogonal to the one valley fold line and the two first valley fold lines and connect the four corner points, and the predetermined tie lines connecting the four corner points Four mountain fold lines formed in parallel with the first and second valley fold lines and having the same height as the vertical and horizontal dimension lengths, and the second valley fold line. A mountain fold line formed to extend, a valley fold line formed to extend from two mountain fold lines having the same length as the longitudinal dimension and parallel to the second valley fold line, and a valley fold line extending from a vertex of the triangle to the first valley fold line. And a mountain fold line formed.
Further, in the packaging container of the present invention, the mountain fold line extending from the second valley fold line is formed so that the interval is narrower than a predetermined lateral dimension, and the valley fold line of the two pairs of slopes has a predetermined horizontal fold line. It may be formed so as to connect the edge of the mountain fold line and the four corner points whose interval is smaller than the dimension. Further, in the packaging container of the present invention, the mountain fold line extending from the second valley fold line is formed so that the interval is wider than a predetermined lateral dimension,
Further, the valley fold lines of the two pairs of slopes may be formed so as to connect the edge of the mountain fold line having a wider interval than a predetermined lateral dimension to the four corner points. Further, the packaging container of the present invention is made of a square sheet, and has a predetermined bottom and vertical dimensions,
The long sides of a pair of opposed triangles having a predetermined length and height, the short sides of a pair of opposed rectangles having a short height,
One side is connected to the long side by one valley fold line, and is formed by two pairs of opposite slopes of a triangle with the height of the short side being the vertex of the two sides formed by the two fold lines. A packaging container having a flange formed of a continuous surface, wherein a rectangular sheet has a short height dimension and a flange dimension that pass through four corner points of a bottom face of a polyhedron having predetermined vertical and horizontal dimensions. And two second valley fold lines, which are orthogonal to the two first valley fold lines and have a predetermined vertical dimension, and two second valley fold lines. Two mountain fold lines each having the same length and having a short height dimension parallel to the second valley fold line;
A valley fold line extending from the book mountain fold line, a mountain fold line formed from a vertex of the long side triangle in parallel with the second valley fold line, and a first valley from the vertex of two sides of the long side triangle. And a mountain fold line extending parallel to the fold line.
According to this packaging container form, one square sheet is cut from a sheet such as a band-shaped film or paper conveyed in the longitudinal direction, and from this square sheet, the flange portion to be bent becomes flat, It is possible to manufacture a packaging container in which a lid seal such as a transparent film can be attached to the upper surface of the flange by fusing or by applying a pressure-sensitive adhesive, etc., at low cost and with high efficiency. Further, in the packaging container according to claim 1, wherein the flange located at the uppermost end of the container can be made parallel to the bottom surface, the length of the flange formed of a plane formed parallel to the bottom surface is changed. It can also be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a packaging container according to an embodiment of the present invention. << Embodiment 1 >> In this embodiment, the packaging container of the present invention is, as shown in FIGS. 1, 2 and 3, a square sheet SS.
1, a bottom surface B1 having predetermined vertical and horizontal dimensions X1 and Y1, a pair of opposed long side surfaces SD1 to SD2 having a predetermined length and height dimension Z1, and an opposing pair having a predetermined short height dimension Z2. Of the short sides SD3 to SD4, one side S1 is connected to the long sides SD1 to SD2 by one valley fold line V1, and the vertex P1 of the two sides S2 to S3 formed by the two mountain fold lines M1 to M2 is This is a polyhedral packaging container formed of two pairs of opposed inclined surfaces SD5 to SD8 of a triangle T1 having a height, and having a flange F1 formed as a continuous surface on the peripheral surface. In order to produce this polyhedral packaging container, a square sheet SS1 has four corner points C1 to C4 of a bottom face B1 of a polyhedron having predetermined vertical and horizontal dimensions X1 and Y1.
And the short height dimension Z2 and the flange F1 dimension FF1
Two first valley fold lines V2 to V3 and 2 formed with
Two second valley fold lines V4 to V5 formed with predetermined vertical and horizontal dimension lengths X1 and Y1 which are orthogonal to the first valley fold lines V2 to V3 and connect the four corner points C1 to C4; First and second valley folding lines V2 having the same lengths as the predetermined vertical and horizontal dimensions X1 and Y1 connecting the four corner points C1 to C4.
And four mountain fold lines M3 to M6 formed to have a length Z1 in parallel with .about.V3 and V4 to V5. As shown in FIG. 4, a mountain fold line M7 extending from the second valley fold line V4, a valley fold line V6 extending from the valley fold line M5, and a vertex P1 of the triangle T1 are formed on the side of the slope side SD5. And a mountain fold line M8 extending parallel to the first valley fold line V2. Such mountain fold lines M7, M8 and valley fold line V6 are provided not only on the side of the slope SD5 but also on the sides of the slopes SD6 to SD8 (FIG. 1). That is, a mountain fold line M7 extending from the second valley fold line V5, a valley fold line V6 extending from the mountain fold line M6, and a first valley fold line V3 from the vertex P1 of the triangle T1.
And the mountain fold line M8 extending parallel to the slope SD6.
Provided on the side. A mountain fold line M7 extending from the second valley fold line V4, a valley fold line V6 extending from the valley fold line M5, and a valley fold line V6 extending from the vertex P1 of the triangle T1 in parallel with the first valley fold line V3. Mountain fold line M8 is provided on the side of the slope SD7. Further, a mountain fold line M7 extending from the second valley fold line V5, a valley fold line V6 extending from the valley fold line M6, and a valley fold line V6 extending parallel to the first valley fold line V2 from the vertex P1 of the triangle T1. Mountain fold line M8 is provided on the side of the slope SD8. In FIGS. 1 and 4, the valley fold line is a dotted line,
The mountain fold lines are illustrated by solid lines. A square sheet SS1 provided with valley fold lines and mountain fold lines shown in FIGS.
(FIG. 5A) is bent as follows. One valley fold line V1, two first valley fold lines V2 to V3, two second valley fold lines V4 to V5, and two fold fold lines M1 to M2, four fold fold lines M3 to M6 And the valley fold line V6 is valley-folded to form a packaging container before completion (FIG. 5 (b)). Subsequently, when valley folds and mountain folds are advanced, on the bottom surface B1 of the polyhedron, the four side surfaces SD1 to SD4 are connected by a triangle T1, four mountain fold lines M3 to M6 are connected by a mountain fold line M1, and the mountain fold lines M3 to M6 , M1 to complete a packaging container in which a flat flange F1 extending in four directions on the peripheral surface is formed (FIG. 5 (c)). The four side surfaces SD1 to SD4 are formed so that the side surfaces SD1 to SD2 have a predetermined length Z1 and the side surfaces SD3 to SD4 are formed so as to have a predetermined short height Z2. Only the flange F1 in contact with the long side surfaces SD1 to SD2 is formed parallel to the bottom surface B1, and the other flange F1 is bent downward from the edge of the flange F1 in contact with the long side surfaces SD1 to SD2. Become. An object to be packaged (not shown) is mounted in the packaging container thus formed, and a lid seal CP1 (FIG. 6) is placed on the flange F1 and adhered by, for example, welding, for example, for food and drink. An airtight packaging container in which such an object is enclosed is constituted. In the square sheet SS1 described above, the mountain fold line M7 is formed to extend from the second valley fold lines V4 and V5. However, the present invention is not limited to this, and FIG.
As shown in (b), the mountain fold lines M7 'extending from the second valley fold lines V4 and V5 are formed such that the interval Y2 is smaller than a predetermined lateral dimension Y1, and two pairs of slopes SD5. ~
The valley fold line V1 'of SD8 is the edge G1 to G of the mountain fold line M7'.
It may be formed so as to connect four and four corner points C1 to C4. In FIG. 7, except for the mountain fold line M7 'and the valley fold line V1', the same valley fold line and mountain fold line are used, and therefore, the description is omitted using the same reference numerals. Such a square sheet SS1 '
When folded as described above, as shown in FIGS. 8 and 9,
The length of the flange F1, which is a plane formed parallel to the bottom surface B1, can be shorter than that of the square sheet SS1. As shown in FIGS. 10A and 10B, the second
The mountain fold line M7 ″ extending from the valley fold lines V4 and V5 is
The interval Y3 is formed to be wider than the predetermined lateral dimension Y1, and the valley fold line V1 ″ of the two pairs of slopes SD5 to SD8 has.
May be formed so as to connect the edges G11 to G14 of the mountain fold line M7 "and the four corner points C1 to C4. In FIG. 9, the same is applied except for the mountain fold line M7" and the valley fold line V1 ". Since the valley fold line and the mountain fold line are used, the description is omitted using the same reference numerals.If such a square sheet SS1 ″ is folded as described above, it is parallel to the bottom surface B1 as shown in FIGS. The length of the flange F1, which is a plane formed on the sheet SS, can be longer than that of the square sheet SS1. << Embodiment 2 >> Further, in this embodiment, the packaging container of the present invention is formed from a square sheet SS10 as shown in FIGS. 13, 14 and 15, and has predetermined vertical and horizontal dimensions X1.
0, a bottom surface B10 having Y10, a pair of opposed long sides SD10 and SD20 having a predetermined length and height dimension Z10, and a pair of opposed square short sides SD30 having a short height dimension Z20;
SD40, one side S10 is connected to the long side by one valley fold line V10, and two sides S20 to S30 formed by two mountain fold lines M10 to M20.
Is a polyhedral packaging container formed of two pairs of opposing inclined surfaces SD50 to SD80 of a triangle T10 having the height of the short side at the apex P10 of the above, and having a flange F10 formed by a continuous surface on the peripheral surface. In order to make this polyhedral packaging container, a rectangular sheet SS10 is provided with four short-length dimensions Z20 and a flange F10 passing through four corner points C10 to C40 of a bottom face B10 of a polyhedron having predetermined vertical and horizontal dimensions X10 and Y10. The two first valley fold lines V20 to V30 formed with the dimension FF10 and the two first valley fold lines V20 to V30 are formed with a predetermined vertical dimension X10. Two valley fold lines V40 to V50 and two mountain fold lines each having the same length as the two second valley fold lines V40 to V50 and having a short height dimension Z20 parallel to the second valley fold lines V40 to V50. M
30 to M40. As shown in FIG. 16, the valley fold line V60 extending from the mountain fold line M30 and the valley fold line V40 are formed on the side of the slope SD50 so as to extend from the vertex P20 of the long side surface SD10 in parallel with the second valley fold line V40. A mountain fold line M50 and a mountain fold line M60 extending parallel to the first valley fold line V20 from the vertex P10 of the two sides S20 to S30 of the triangle of the long side surface SD10 are provided. Such a valley fold line V60 and a mountain fold line M50,
M60 is not only the slope SD50 side, but also the slope SD60 ~
SD80 (FIG. 13) is also provided. That is, a valley fold line V60 extending from the mountain fold line M40, a mountain fold line M50 extending parallel to the second valley fold line V50 from the vertex P20 of the triangle of the long side SD20, and a triangle of the long side SD20. Side S20 ~
A mountain fold line M60 extending parallel to the first valley fold line V30 from the vertex P10 of S30 is provided on the side of the slope SD60.
A valley fold line V60 extending from the mountain fold line M30;
A mountain fold line M60 extending parallel to the first valley fold line V30 from the vertex P10 of the two sides S20 to S30 of the triangle of the long side SD20 is provided on the slope side SD70 side. Furthermore, Yamaori Line M40
And a mountain fold line M60 extending parallel to the first valley fold line V20 from the vertex P10 of the two sides S20 to S30 of the triangle of the long side surface SD10.
Provided on the side. 13 and 16, the valley fold line is illustrated by a dotted line, and the mountain fold line is illustrated by a solid line. The square sheet SS10 (FIG. 17A) provided with the valley fold line and the mountain fold line shown in FIGS. 13 and 16 is bent as follows. One valley fold line V10, two first valley fold lines V20 to V
30, two second valley fold lines V40-V50, two mountain fold lines M10-M20, two mountain fold lines M30-M40, and further mountain fold lines M50, M60, valley fold line If V60 is folded in a valley, a packaging container before completion is formed (FIG. 17B). Continue to make valley and mountain folds.
The side faces SD10 to SD40 are connected by a triangle T10, the two mountain fold lines M30 to M40 are connected by four mountain fold lines M10, and a flat flange F10 extending from the mountain fold lines M30 to M40 and M10 to the peripheral surface is formed. The completed packaging container is completed (FIG. 17).
(C)). The four side surfaces SD10 to SD40 are the side surface SD10.
SD20 to SD20 are formed in a triangle so as to have a predetermined length H10, and the side surfaces SD30 to SD40 are formed to have a predetermined short height Z20.
Is formed in a square shape with
Reference numeral 10 denotes a shape bent downward around the mountain fold line M50, that is, a slope. An object to be packaged (not shown) is mounted in the packaging container thus formed, and a lid CP10 (FIG. 18) is placed on the flange F10 and adhered by, for example, welding, for example, like food or drink. The sealed packaging container in which the various packaging items are wrapped is constituted.

As is clear from the above embodiments, according to the packaging container of the present invention, the bent flange portion is flattened, and a lid seal such as a transparent film is fused or bonded to the upper surface of the flange. It is possible to manufacture a packaging container that can be attached at low cost and with high efficiency.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a square sheet provided with a valley fold line and a mountain fold line forming a packaging container according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a packaging container according to an embodiment of the present invention.

FIG. 3 is a view showing a packaging container according to an embodiment of the present invention;
(A) is a front view, (b) is a side view.

FIG. 4 is a partial perspective view showing a square sheet having a valley fold line and a mountain fold line forming a packaging container according to an embodiment of the present invention.

FIGS. 5A, 5B, and 5C are perspective views showing steps of forming a packaging container according to an embodiment of the present invention.

FIG. 6 is a perspective view showing a step of forming a hermetically sealed packaging container according to an embodiment of the present invention.

7A and 7B are views showing another form of the packaging container according to one embodiment of the present invention, wherein FIG. 7A is a perspective view of a square sheet having a valley fold line and a mountain fold line forming the packaging container, and FIG. 3 is a partial perspective view of FIG.

FIG. 8 is a perspective view showing a packaging container completed by folding the square sheet of FIG. 7;

9 is a view showing the packaging container of FIG. 8, (a) is a front view,
(B) is a side view.

10A and 10B are diagrams showing another embodiment of the packaging container according to the embodiment of the present invention, wherein FIG. 10A is a perspective view of a square sheet provided with a valley fold line and a mountain fold line forming the packaging container, and FIG. Is (a)
FIG.

11 is a perspective view showing a packaging container completed by bending the square sheet of FIG. 10;

12 is a view showing the packaging container of FIG. 11, (a) is a front view, and (b) is a side view.

FIG. 13 is a perspective view showing a square sheet provided with a valley fold line and a mountain fold line forming a packaging container according to another embodiment of the present invention.

FIG. 14 is a perspective view showing a packaging container according to another embodiment of the present invention.

FIG. 15 is a view showing a packaging container according to another embodiment of the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 16 is a partial perspective view showing a square sheet provided with a valley fold line and a mountain fold line forming a packaging container according to another embodiment of the present invention.

17 (a), (b) and (c) are perspective views showing steps of forming a packaging container according to another embodiment of the present invention.

FIG. 18 is a perspective view showing a step of forming a sealed packaging container according to another embodiment of the present invention.

[Explanation of symbols]

 << Example 1 >> SS1 ... Square sheet F1 ... Flat flange FF1 ... Flange dimensions X1, Y1 ... Predetermined vertical and horizontal dimensions B1... Bottom face of polyhedron Z1... Predetermined length and height Z2... Predetermined short height C1 to C4. Corner point S1 One side V1 One valley fold line V2 to V3 Two first valley fold lines V4 to V5 Two The second valley fold line M1-M2 ... two mountain fold lines SD1-SD2 ... a pair of long sides SD3-SD4 ... a pair of short sides SD5-SD8 ... ... Two pairs of slopes T1... Triangle P1... Vertices of triangle S2 to S3... Two sides of triangle M3 to M6. Book origami line M7 ・ ・ ・ ・ ・ ・ Yamaori line G1 G4: Edge of mountain fold line G11 to G14: Edge of mountain fold line M8: Mountain fold line V6: Valley fold line << Example 2 >> SS10・ ・ ・ ・ ・ ・ Square sheet F10 ・ ・ ・ ・ ・ ・ Flat flange FF10 ・ ・ ・ ・ ・ ・ Flange dimensions X10, Y10 ・ ・ ・ ・ ・ ・ Predetermined vertical and horizontal dimensions B10 ・ ・ ・ ・ ・ ・· Bottom surface of polyhedron Z10 ····· Predetermined length and height Z20 ······ Specified short height C10 to C40 ····· Four corners of the bottom of the polyhedron S10 One side V10 One valley fold line V20 to V30 Two first valley fold lines V40 to V50 Two second valley fold lines M10 ... M20 ... two mountain fold lines SD10-SD20 ... ... long sides of a pair of triangles SD30-SD40 ... ... short sides of a pair of squares SD50-SD80 ... ..Two pairs Side T10: Triangle P10: Vertex of two sides of triangle P20 ...: Vertex of triangle S20-S30: Two sides of triangle M30-M40 ...・ ・ ・ ・ 2 mountain fold lines V60 ・ ・ ・ ・ ・ ・ valley fold line M50 ・ ・ ・ ・ ・ ・ yamafold line M60 ・ ・ ・ ・ ・ ・ yamafold line

Claims (4)

[Claims] 1. It is made from a square sheet (SS1),
A bottom surface (B1) having predetermined vertical and horizontal dimensions (X1, Y1), a pair of opposed long side surfaces (SD1 to SD2) having predetermined length and height dimensions (Z1), and a predetermined short height dimension (Z2) A pair of short side surfaces (SD3 to SD4) and one side (S1) are connected to the long side surface by one valley fold line (V1) and formed by two mountain fold lines (M1 to M2). A flange formed of two pairs of opposed slopes (SD5 to SD8) of a triangle (T1) having the vertex (P1) of the side (S2 to S3) as the height of the short side, and a continuous surface formed on the peripheral surface. (F1), wherein the rectangular sheet passes through four corner points (C1 to C4) of a bottom surface of the polyhedron having the predetermined vertical and horizontal dimensions and the short height dimension And two first valley fold lines (V2 to V3) formed with the dimensions of the flange (FF1) and
Two second valley fold lines (V4 to V5) formed to have the predetermined vertical and horizontal dimension lengths which are orthogonal to the first valley fold lines and connect the four corner points; Four mountain fold lines (M3 to M6) having the same length as the predetermined vertical and horizontal dimension lengths and having the length and height in parallel with the first and second valley fold lines; Mountain fold line extending from two valley fold lines (M7)
The same length as the longitudinal dimension and parallel to the second valley fold line;
A packaging provided with a valley fold line (V6) formed extending from a mountain fold line and a mountain fold line (M8) formed extending from a vertex of the triangle in parallel with the first valley fold line. container. 2. The mountain fold line extending from the second valley fold line is formed so that the interval is smaller than the predetermined lateral dimension, and the valley fold line of the two pairs of slopes is the predetermined fold line. The edge of the mountain fold line (G1-
The packaging container according to claim 1, wherein the packaging container is formed so as to connect G4) with the four corner points. 3. The mountain fold line extending from the second valley fold line is formed so as to have an interval larger than the predetermined lateral dimension, and the valley fold line of the two pairs of slopes is the predetermined fold line. The edge of the mountain fold line (G11-
The packaging container according to claim 1, wherein the packaging container is formed so as to connect G14) with the four corner points. 4. It is made from a square sheet (SS10),
A bottom surface (B10) having predetermined vertical and horizontal dimensions (X10, Y10);
A pair of opposing triangular long sides (SD10, SD20) having a predetermined height (Z10), a pair of opposing quadrangular short sides (SD30, SD40) having a short height (Z20),
One side (S10) is connected to the long side surface by one valley fold line (V10), and the vertex (P10) of two sides (S20 to S30) formed by two ridge fold lines (M10 to M20) is defined as the short side. Two pairs of opposite slopes (SD50 to S50) of a triangle (T10) with the height of the side
D80) and a packaging container having a flange (F10) formed on the peripheral surface with a continuous surface, wherein the square sheet has four corners at the bottom of the polyhedron having the predetermined vertical and horizontal dimensions. Two first valley fold lines (V20 to V30) and the two first valley fold lines that pass through points (C10 to C40) and are formed having the short height dimension and the flange dimension (FF10). Two second valley fold lines (V40 to V50) which are formed perpendicularly to and having the predetermined vertical dimension; and the two valley fold lines having the same length as the two second valley fold lines and being parallel to the second valley fold line. Two mountain fold lines (M30 to M40) each having a short height dimension, and a valley fold line (V60) extending from the two mountain fold lines
And a vertex (P) of the triangle on the long side in parallel to the second valley fold line.
20) and a mountain fold line (M50) formed from the first side from the vertex of the two sides of the long side triangle.
A packaging container provided with a mountain fold line (M60) extending parallel to the valley fold line.