Forming mold facilitating demolding of side face connection type bag body

Abstract

The utility model relates to the field of bag body processing moulds, and discloses a forming mould convenient for demoulding a side face connection type bag body, which comprises a mould core, bag opening pieces are respectively connected with the left side and the right side of the mould core, and the bag opening piece on each side comprises a side supporting plate and a transverse supporting plate. Transverse supporting faces are arranged on the outer sides, relative to the mold core, of the transverse supporting plates on the front side and the rear side of the side supporting plate correspondingly and used for making contact with the inner surface of the front side or the rear side of the bag body, the side supporting plate comprises a front bag supporting part, a rear bag supporting part and a concave part, and the outer surface of the concave part at least comprises a supporting face providing supporting force for the side face of the bag body during center sealing or bonding connection. According to the utility model, the connected part of the side surface of the bag body or the side surface and the bottom corner part are naturally extruded towards the concave part of the die in the forming process, and when the edge sealing forming part is withdrawn, the side edge connecting part of the bag body naturally pops up outwards to form a gap with the die, so that the bag body cannot be tightly attached to the die, and the production efficiency is improved. The separation with the mold is more convenient.

Description

Technical Field

[0001] The utility model relates to the field of bag body processing molds, in particular to a forming mold which is convenient for demoulding a side-connected bag body. Background Art

[0002] The packaging bag includes a bag body made of paper bags, non-woven fabrics or other materials. During the forming process of the side-connected bag body, the bag body needs to be folded in a U-shaped state. Therefore, the production equipment needs to be equipped with a special mold that extends into the bag body. The mold also needs side panels with a spacing of the width of the bag body on both sides, so that the inner side can support the side of the bag body for folding and forming. For example, the Chinese utility model patent with the announcement number CN212353094U, named as an adjustable mold for three-dimensional bag forming and a three-dimensional bag forming machine, discloses an adjustable mold for three-dimensional bag forming, including an inner mounting plate, and the inner mounting plate is connected with side panels on both sides. The side panels can be translated left and right relative to the inner mounting plate, and the side panels are detachable and replaceable relative to the inner mounting plate. As can be seen from the figure, the side panels are smooth on the front, rear and outer surfaces. When the bag body is formed outside the mold, the bag body will be fully wrapped outside the mold on all four sides after the side panels are connected. This will cause the bag body to be in close contact with the mold and difficult to demold.

[0003] In order to solve this problem, the bag body will have a taper on the side that is smaller at the bottom and larger at the top. Either the front and back sides do not completely fit the mold, or the side connection is skewed so that the side of the bag body does not completely fit the mold. The bag body formed in this way is not beautiful enough and its strength will be affected. Summary of the invention

[0004] The utility model aims at the shortcomings of the prior art and provides a forming die which is convenient for demoulding a side-connected bag body.

[0005] To solve the above technical problems, the utility model is solved by the following technical solutions:

[0006] A forming mold for demoulding a side-connected bag body, comprising a mold core, bag-supporting parts connected to the left and right sides of the mold core, each bag-supporting part comprising a side support plate and a transverse support plate, the transverse support plates on the front and rear sides of the side support plate are respectively provided with transverse support surfaces on the outside relative to the mold core, for contacting the inner surface of the front or rear side of the bag body, the side support plate comprises a front support bag part, a rear support bag part and a recessed part, the outer surfaces of the front support bag part and the rear support bag part of the same side support plate jointly form a longitudinal support surface, the longitudinal support surface is respectively connected with the transverse support surfaces on the front and rear sides to form a support angle, the projection of the support angle on the horizontal plane is a right angle, and the outer surface of the recessed part at least includes a support surface that provides support force for the side of the bag body when it is centrally sealed or bonded. The vertical plane where the lowest point of the recessed part is located is located on the inner side of the longitudinal support surface, and the vertical plane where the highest point of the recessed part is located does not exceed the longitudinal support surface. During the molding process, the edge seal molding part is naturally squeezed toward the concave part of the mold. When the edge seal molding part is withdrawn, generally speaking, the concave part at least includes the part that is connected to the side of the bag body. The side connection part of the bag body will naturally pop out and separate from the concave part. This part will have a gap with the mold, so the bag body will not fit tightly with the mold, and it is easier to separate from the mold. Since the four edges are all projected at right angles on the horizontal plane, the edge part connecting the entire mold and the bag body forms a rectangular column or a state close to a rectangular column, so that the upper and lower cross-sections of the bag body formed by the mold can be almost the same in length, width, and size, and will not present a tapered state with a small top and a large bottom.

[0007] Preferably, the concave portion extends to the bottom of the bag-supporting member, and the bottom edges of the front and rear bag-supporting members have a receiving portion at a distance from the bottom edge of the bag-supporting member, the receiving portion is a plane, and the concave portion includes the receiving portion. The receiving portion can, on the one hand, allow the folded tongue of the bag body to be turned up and covered on the receiving portion, and on the other hand, allow the four bottom corners of the bag body to move further inward relative to the four side ribs during molding, and after the molding device pressing the bag body on the outside is withdrawn, the bottom corners will also rebound, and a gap will be generated between the mold, which is more conducive to demolding.

[0008] Preferably, the outer surface of the recess is a plane, and the vertical plane where the lowest point is located is the same plane as the vertical plane where the highest point is located, and the plane is located on the inner side of the longitudinal support surface.

[0009] Preferably, the plane where the recessed portion is located has a height difference of 0.3-2 mm with the longitudinal support surface. The height difference of the recessed portion can be selected according to the specific size and material of the bag body.

[0010] Preferably, the front side of the concave portion is the front support pocket portion, and the rear side is the rear support pocket portion. The front support pocket portion and the rear support pocket portion are both in the shape of vertical strips, and the concave portion forms an "inverted T" shape. The vertical strips can cooperate with the horizontal support plate to keep the four edges of the bag body vertical during molding, and the "inverted T"-shaped concave portion allows the side connection part and the bottom corner part of the bag body to have a gap with the mold after molding, which is convenient for demoulding.

[0011] Preferably, the bag support member is arranged on the mold core for left-right adjustment, and the bag support member and the mold core are fixedly connected or movably connected. Different models of molds differ in at least one of the length dimension, height dimension and thickness dimension, which is related to the specific bag type produced. Those skilled in the art can design it according to the actual situation and specific needs. This embodiment does not make specific limitations on this. For example, the left-right adjustment of the bag support member can adjust the length dimension of the mold, the width dimension of the bag support member corresponds to the thickness dimension of the bag body, and the height dimension generally does not need to be adjusted.

[0012] Preferably, the mold core is connected to a power source for driving it to move up and down.

[0013] The utility model has significant technical effects due to the adoption of the above technical solutions:

[0014] The utility model adopts a special structural design, so that the connecting part of the side of the bag body or the side and bottom corner parts are naturally squeezed toward the concave part of the mold during the molding process. When the edge sealing molding component is withdrawn, the connecting part of the side of the bag body will naturally pop out and create a gap between the mold, so that the bag body will not fit tightly with the mold and it is more convenient to separate from the mold.

[0015] Due to the mold structure of the utility model, even if the bag body is tightly formed in the mold, it is convenient to demould. The formed bag body does not need to be tapered on the front or side. The bag shape can be more neatly processed to ensure that each side edge connected to the bag body is vertical relative to the bottom surface, and the side connection part is also straight, which is beneficial to the aesthetics and bearing capacity of the bag body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a front view of the utility model.

[0018] Figure 3 It is an exploded view of the utility model.

[0019] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1, mold core; 2, bag support member; 21, side support plate; 211, front bag support part; 212, rear bag support part; 213, recessed part; 214, accommodating part; 22, cross support plate; 221, transverse supporting surface; 23, corner support. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] Example 1

[0022] A forming mold that facilitates demoulding of a side-connected bag body, such as Figure 1-3 As shown, it includes a mold core 1, and bag support members 2 are connected to the left and right sides of the mold core 1, and the bag support members 2 on each side include side support plates 21 and transverse support plates 22. The transverse support plates 22 on the front and rear sides of the side support plates 21 are respectively provided with transverse support surfaces 221 on the outer sides relative to the mold core 1, which are used to contact the inner surface of the front side or rear side of the bag body. The side support plates 21 include a front support bag part 211, a rear support bag part 212 and a recessed part 213. The outer surfaces of the front support bag part 211 and the rear support bag part 212 of the same side support plate 21 jointly form a longitudinal support surface, and the longitudinal support surface is respectively connected with the transverse support surfaces 221 on the front and rear sides to form a support angle 23, and the projection of the support angle 23 on the horizontal plane is a right angle. The outer surface of the recessed part 213 at least includes a support surface that provides support force when the side of the bag body is sealed or bonded in the center. The vertical plane where the lowest point of the recessed part 213 is located is located on the inner side of the longitudinal support surface, and the vertical plane where the highest point of the recessed part 213 is located does not exceed the longitudinal support surface. The side support plates 21 and the cross support plates 22 can be separate but connected to each other, or they can be integrally formed.

[0023] The recess 213 extends to the bottom of the bag-supporting member 2. The bottom edges of the front and rear bag-supporting portions 211 and 212 have a receiving portion 214 at a distance from the bottom edge of the bag-supporting member 2. The receiving portion 214 is a plane, so that the folded tongue portion of the bag body is turned up and covers the receiving portion 214. The recess 213 includes the receiving portion 214.

[0024] The outer surface of the recess 213 is a plane, and the vertical plane where the lowest point is located is the same plane as the vertical plane where the highest point is located, and the plane is located on the inner side of the longitudinal support surface. The plane where the recess 213 is located has a height difference of 0.3-2mm with the longitudinal support surface. The height difference can be any value such as 0.3mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, etc., among which 0.5mm is preferred. The front side of the recess 213 is the front support pocket 211, and the rear side is the rear support pocket 212. The front support pocket 211 and the rear support pocket 212 are both vertical strips, and the recess 213 forms an "inverted T" shape.

[0025] The bag support part 2 is adjusted left and right on the mold core 1, and the bag support part 2 and the mold core 1 are fixedly connected or movably connected. The mold core 1 is connected to a power source that drives it up and down. When the entire mold is working, it is generally equipped with an upper and lower power source. The power source can be a cylinder, a motor, etc. or a transmission device to drive the mold to move linearly so that it can enter and exit the bag body, and can also perform the action of pressing the bag body downward to form. This structure is a conventional setting for people in this field, and its structure and working principle will not be repeated here.

[0026] During operation, the front and rear surfaces of the bag body are turned up to form a U shape at the bottom of the mold, and the front of the bag body is attached to the outer surfaces of the left and right transverse braces 22 located on the front side, which is the transverse supporting surface 221 on the front side, and the back of the bag body is attached to the outer surfaces of the left and right transverse braces 22 located on the rear side, which is the transverse supporting surface 221 on the rear side. Then the folding tongues on the left and right sides of the bottom of the bag body are turned up and attached to the left and right accommodating parts 214. The front and rear parts of the bag body that form the side surfaces are folded sideways and the connecting parts are attached to the recessed part 213. The folded corners formed by the folding are attached to the outside of the straight corners 23 formed by the longitudinal supporting surfaces and the transverse supporting surfaces 221 respectively, so as to ensure the stiffness of the corners of the bag body. When the side is connected, since the vertical plane where the lowest point of the recess 213 is located is located on the inner side of the longitudinal support surface, the edge seal molding component on the outer side of the side presses the bag surface onto the mold. Therefore, the part of the bag side that is connected is naturally squeezed toward the recess 213 during the molding process, and moves more inward than the corner part of the bag body. When the edge seal molding component is withdrawn, due to the stiffness of the corner part, the side connection part of the bag body will naturally pop out and separate from the recess 213. After a gap is generated between this part and the mold, the bag body will not fit tightly between the mold, and it is more convenient to separate from the mold.

[0027] The existence of the accommodating portion 214 allows the folded tongue of the bag body to be turned up and covered on the accommodating portion 214, and on the other hand allows the four bottom corners of the bag body to move further inward relative to the four side ribs during molding. After the molding device pressing the bag body on the outside is withdrawn, the bottom corners will also rebound, creating a gap with the mold, which is more conducive to demolding.

[0028] In the description of the present utility model, it is necessary to understand that the terms "center", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like of the bag-supporting member 2 indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. A molding die for facilitating demoulding of a side-connected bag body, comprising a mold core (1), bag-supporting members (2) are connected to the left and right sides of the mold core (1), each bag-supporting member (2) comprises a side support plate (21) and a transverse support plate (22), and the transverse support plates (22) on the front and rear sides of the side support plate (21) are respectively provided with transverse support surfaces (221) on the outer sides relative to the mold core (1), for contacting the inner surface of the front side or the rear side of the bag body, characterized in that: The side support plate (21) comprises a front support pocket portion (211), a rear support pocket portion (212) and a recessed portion (213); the outer surfaces of the front support pocket portion (211) and the rear support pocket portion (212) of the same side support plate (21) jointly form a longitudinal support surface; the longitudinal support surface is respectively connected to the transverse support surfaces (221) at the front and rear sides to form a support angle (23); the projection of the support angle (23) on the horizontal plane is a right angle; the outer surface of the recessed portion (213) at least comprises a support surface for providing support force when the side surface of the bag body is centrally sealed or bonded; and the vertical plane where the lowest point of the recessed portion (213) is located is located on the inner side of the longitudinal support surface.

2. A molding die for facilitating demoulding of a side-connected bag according to claim 1, characterized in that: The recess (213) extends to the bottom of the bag-supporting member (2); the bottom edges of the front bag-supporting member (211) and the rear bag-supporting member (212) have a receiving portion (214) at a distance from the bottom edge of the bag-supporting member (2); the receiving portion (214) is a plane, and the recess (213) includes the receiving portion (214).

3. A molding die for facilitating demoulding of a side-connected bag according to claim 1, characterized in that: The outer surface of the recess (213) is a plane, the vertical plane where the lowest point is located is the same plane as the vertical plane where the highest point is located, and the plane is located on the inner side of the longitudinal support surface.

4. A molding die for facilitating demoulding of a side-connected bag according to claim 3, characterized in that: The plane where the recess (213) is located has a height difference of 0.3-2 mm with the longitudinal support surface.

5. A molding die for facilitating demoulding of a side-connected bag according to any one of claims 1 to 4, characterized in that: The front side of the recess (213) is the front support pocket (211), and the rear side is the rear support pocket (212). Both the front support pocket (211) and the rear support pocket (212) are in the shape of vertical strips, and the recess (213) forms an "inverted T" shape.

6. The molding die for facilitating demoulding of a side-connected bag according to claim 1, characterized in that: The bag supporting member (2) is arranged on the mold core (1) so as to be adjusted left and right, and the bag supporting member (2) and the mold core (1) are fixedly connected or movably connected.

7. The molding die for facilitating demoulding of a side-connected bag according to claim 1, characterized in that: The mold core (1) is connected to a power source for driving it to move up and down.

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