JPS6311084Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention has bent pieces projecting in the shape of steps from one side of the front and back walls to the other at the top and bottom of a cylindrical body and having steps on both side edges in a vertically symmetrical manner. This invention relates to preventing the leakage of stored items from the inlet by preventing weakening of the valve action of the bag, which is formed by forming a bent piece and pasting the folded piece with adhesive to close the mouth and bottom of the bag.

BACKGROUND ART In these bags, which have been widely used in the past, as shown in a general development view in FIG. Stairs 5, 5, . . . , etc. are provided consecutively to this. In addition, the inner layer paper 2 has a bottom protrusion b and a corresponding opening cutout portion of the same shape, substantially similar to the outer layer paper.
C' is formed, and stair portions 5', 5', etc. are connected to this on the left and right. As described above, the outer layer paper 1 and the inner layer paper 2 are stacked on top of each other in the front, back, right and left directions as a whole as shown in the developed view of FIG. 3, and with the protrusions and missing portions being shifted in the up and down direction. Also, 3a, 3b, which constitute both side folds 3, 3,
Parallel folding lines 3c and triangular folding lines d constituting the air inlet are carved.

Problems to be Solved by the Invention However, in the conventional bag of this type, the exploded view of FIG. 3 is folded into a cylindrical body as shown in FIG. 1.
Then, when the triangular folding line d for forming the air inlet 4 is folded inward, the inner and outer paper layers are shifted vertically and horizontally. The folded piece of the inner layer tube (bottom side) is longer than the folded piece of outer layer paper and is configured to protrude inwardly and shift, so there is a step between the paper layers of the inner and outer folded pieces, which can cause stored items to become clogged. The bottom portion formed by the folded piece has a defect in that it lacks flexibility and as a result, the valve action is weakened, resulting in leakage of stored items from the inlet.

The present invention relates to a completely new technique developed in view of these conventional problems.

Means and Effects for Solving the Problems The present invention solves the above-mentioned problems. By making the valve paper for the air inlet protrude outward from the protruding part that protrudes from the folding piece of the outer layer so as to cover the folding piece of the outer layer paper, there is no difference in level between the paper layers of the inner and outer folding pieces, thereby preventing the stored items from clogging. This is a multilayer paper bag having an inlet, which is characterized by preventing weakening of the valve action and preventing leakage of stored items from the inlet.

(Example) An example of implementation will now be described in detail along with drawings. Each reference numeral is the same as that used in the explanation of FIGS. 1 to 3. As shown in the developed view of Fig. 4, the outer layer paper 1 has a protruding part a' and a corresponding bottom concave part b'' of almost the same shape, and step parts 5, 5, 5, etc. are formed by connecting them on both sides. Also, folded curves 3a, 3b, 3c forming the folds 3, 3 on both sides are carved, and a triangular folded line d forming an air inlet is carved. This is an explanatory diagram of the inner layer paper to be combined with the outer layer paper shown in the figure, when it is continuously cut into a cylindrical body, and FIG. 6 is the inner layer paper for one bag cut by the cutting method shown in FIG. 5. Fig. 2 is a plan view of an inner layer cylinder having a cylindrical body.This inner layer cylinder is formed in approximately the same shape as the outer layer paper, and has pleats 3 on both sides. Folding pieces 6 and 7 each having step portions 5 and 5 are vertically symmetrically arranged in series, and the left corner of the mouth portion is folded inward from the triangular fold line d of the outer layer paper. A protruding piece d' that is folded overlapping the folding piece e has the same dimensions as that protruding piece, and is symmetrically formed with a cutout part f at the bottom left corner.Next, the protruding piece d of the inner layer cylinder According to the present invention, the valve paper 10 for the inlet is formed by protruding outwardly from above the protrusion g that protrudes from the length of the folded piece e of the outer layer paper so as to cover the folded piece e of the outer layer paper. The multilayer paper bag according to the present invention is constructed by shifting the mouth protrusion and the bottom recess in the front, back, left, and right directions, respectively, and then stacking the outer layer of paper. Both sides fold curve 3a,
3b and 3c are bent to match the folds 3 and 3 of the inner layer cylinder to form a cylindrical body A having both folds. (See Figure 7) Next, the overlapping part of the folded piece e of the outer layer paper of the cylindrical body A and the protruding piece d' of the inner layer cylinder is folded inward from the triangular fold line d, and air is injected using the valve paper 10 for the air inlet. A mouth is formed, and the folded pieces 6 and 7 are then pasted to the front and rear walls using a conventional method to form a mouth and a bottom, thereby producing the multilayer paper bag of the present invention.

In addition, it is desirable that the valve paper for the inlet be laminated by folding it over the protrusion g.

When using the multilayer paper bag according to the present invention, the nozzle is inserted into the inlet and the bag is filled with air and the contents, and then the nozzle is pulled out and the inlet is closed by the bag's internal pressure.

(Effects) As mentioned above, the multilayer paper bag according to the present invention has two layers, the inner and outer layers, has pleats on both sides, and has steps on both sides of the cylindrical body symmetrically from one side to the other on the top and bottom of the cylindrical body. In a bag which is made by sticking bent pieces projecting in a stepwise manner to the front and rear walls to close the opening and the bottom, the corners are folded inward to form an inlet, and the protruding piece d' of the inner layer tube is attached to the inlet. The air inlet valve paper 1 is made to protrude outwardly from above the protrusion g that protrudes beyond the length of the folded piece e of the outer layer paper so as to cover the folded piece e of the outer layer paper.
0, the bottom of the inlet can form a step on the surface without the folded piece e of the outer layer paper and the protruding piece d' of the inner layer cylinder shifting, unlike the inlet of conventional bags of this type. do not have. Therefore, the inner and outer paper layers of the folded piece of the air inlet are on the same plane, completely preventing the stored items from clogging. Therefore, the bottom of the inlet does not lack flexibility. Therefore, the present invention provides a multilayer paper bag with great practical value, which prevents weakening of the valve action of the air inlet and completely prevents leakage of stored items from the air inlet during transportation, storage, etc.

[Brief explanation of the drawing]

Figure 1 is a front view with the corner of the mouth of the cylindrical body folded into the inside of the cylindrical body, and Figure 2 is a symmetrical view of the cylindrical body in Figure 1 taken from the E-I line and the Rollo line. 3 is a developed view of the general inner and outer paper layers of the bag of the form shown in FIG. 2; FIG. 4 is a developed view of the outer paper layer of the bag of the present invention; Figure 5 is an explanatory diagram of continuously cutting the inner layer paper into a cylindrical body, and Figure 6 is an illustration of the
Fig. 7 is a front view of the inner layer cylinder for one bag cut by the cutting method shown in the figure, Fig. 7 is a front view of the cylindrical body A in which the outer layer paper and the inner layer cylinder are combined, and Fig. 8 is the front view of the inner layer cylinder for forming the inlet. An enlarged explanatory view when the corner part is folded inward, Figure 9 is a plan view of Figure 8 when it is opened, and Figure 10 is an illustration of Figure 9 with the valve paper for the inlet attached. Plan of time,
Fig. 11 is a front view of Fig. 10, Fig. 12 is an explanatory view before folding the corner portion, and Fig. 13 shows the relationship between the folding piece e, the protruding piece d', and the valve paper 10 for the inlet. It is a cross-sectional explanatory view. In addition, each code in the figure is 1 for outer layer paper, 2 for inner layer paper,
2' is the inner layer cylinder, 3, 3 are the folds, 3a, 3b, 3c
is a folded curve, 4 is an inlet, 5, 5... and 5',
5'... is a staircase part, 6, 7 is a bent piece, 8, 9 is a mouth part and a bottom part, 10 is a valve paper for an inlet, b, b' is a bottom protrusion part, c, c' is a mouth part missing part , d is a triangular fold line,
e is a folded piece, a' is a protruding part, b'' is a bottom recess, d' is a protruding piece, f is a defective part, A is a cylindrical body, g is a protruding part, E-I and Ro-Ro wires are folded parts. Each curve is shown below.

Claims (1)

[Scope of utility model registration request] The upper and lower corners of the cylindrical body are formed by connecting bent pieces that have pleats on both sides and protrude like steps from one side of the front and rear walls to the other in a vertically symmetrical manner with steps on both side edges. In a multilayer paper bag that is folded inward to form an inlet, and both folded pieces are pasted symmetrically to the front and rear walls to close the opening and bottom, the length of the folded piece of outer layer paper that forms the inlet. Furthermore, a multilayer paper bag having an air inlet formed by projecting a valve paper for the air outlet outward from a protrusion of a protruding piece of an inner layer tube that protrudes from the folded piece of the outer layer paper so as to cover the folded piece of the outer layer paper.