JP2018001745A - Film for cushioning material, and manufacturing method and manufacturing apparatus for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film for a cushioning material, capable of being disposed of by efficiently removing filled gas.SOLUTION: A film for a cushioning material as a film for a cushioning material 70 in which gas is injected between overlapped films is such that: a boundary of a first area into which gas is injected is regulated by a first welded part of the film; a boundary of a second area into which gas is injected is regulated by a second welded part of the film; a perforation 50a for separating the first area and the second area is formed between the first welded part and the second welded part; a notch 50b for tearing off the film is formed in part of the perforation; and an interval between the first welded part and the second welded part in a part including the notch of the perforation is wider than an interval between the first welded part and the second welded part in a part excluding the part including the notch.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a film for a buffer material used by filling a gas, a method for manufacturing a film for a buffer material, and an apparatus for manufacturing a film for a buffer material.

  As a cushioning material used for packing an article, a cushioning material filled with air is practically used. In the manufacture of the buffer material, after films made of synthetic resin or the like are overlapped and welded, regions filled with air at a predetermined pitch are separated by welding, and perforations are formed between the regions. Thereafter, the cushioning material is manufactured by filling each region with air. And various techniques which improve the convenience of such a buffer material are proposed (for example, patent documents 1-3).

Utility Model Registration No. 3173521 JP-A-2015-199143 Japanese Patent No. 3613700

  After use of the cushioning material, the filled air is removed and discarded. However, in the conventional cushioning material, there is a concern that an operation of making a hole or tearing the film is required for each region filled with air, and it takes time and effort to remove the air.

  In view of the above circumstances, an object of one aspect of the technology disclosed herein is to provide a film for a cushioning material that can efficiently remove and discard a filled gas.

  The shock absorbing film according to one aspect of the technology of the present disclosure is a shock absorbing film in which a gas is injected between the stacked films, and the gas is injected by the first welded portion of the film. A boundary between the first welded portion and the second welded portion is defined between the first welded portion and the second welded portion. A perforation for separating the first region and the second region is formed, and a slit for cutting the film is formed in a part of the perforation. The interval between the welded portion and the second welded portion is wider than the interval between the first welded portion and the second welded portion other than the portion including the notch. As a result, when the cushioning material is cut from the cut, a plurality of regions filled with gas can be cut together.

In addition, a method for manufacturing a buffer material film according to one aspect of the technology of the present disclosure is a method for manufacturing a buffer material film in which a gas is injected between stacked films, and the first welded portion is attached to the film. Defining the boundary of the first region where the gas is injected by forming the gas, and defining the boundary of the second region where the gas is injected by forming the second welded portion on the film, and A step of forming a perforation for separating the first region and the second region between the first welded portion and the second welded portion; A step of forming a notch, wherein the first welded portion in the portion including the notch in the perforation has a distance between the first welded portion and the second welded portion other than the portion including the notch. Second
It is wider than the interval between the welded parts.

  The shock absorber film manufacturing apparatus according to one aspect of the technology of the present disclosure is a shock absorber film manufacturing apparatus in which a gas is injected between the stacked films, and the first welded portion of the film Forming a second weld portion defining the boundary of the first region where the gas is injected and forming a second weld portion on the film to define the boundary of the second region where the gas is injected A perforation forming portion for forming a perforation for separating the first region and the second region between the second welded portion, the first welded portion and the second welded portion; A slit forming portion for forming a slit for cutting the film, and a gap between the first welded portion and the second welded portion in the portion including the cut in the perforation, The first welded part and the second part other than the part including the notch Wider than the distance between Chakububun.

  According to one aspect of the technology of the present disclosure, it is possible to provide a shock absorbing film that can efficiently remove and discard the filled gas.

Fig.1 (a) is a front view which shows roughly an example of the metal mold | die for thermocompression bonding of the film for buffer materials used for manufacture of the buffer material which concerns on one Embodiment, FIG.1 (b) It is a side view. Fig.2 (a) is a front view which shows roughly an example of the perforation cutter used for manufacture of the shock absorbing material which concerns on one Embodiment, FIG.2 (b) is the side view. Fig.3 (a) is a figure which shows typically an example of the manufacturing process of the shock absorbing material which concerns on one Embodiment, and FIG.3 (b) is a figure which shows typically the shock absorbing material processed by the said manufacturing process. It is. Fig.4 (a) is a figure which shows typically an example of the manufacturing process of the shock absorbing material which concerns on one Embodiment, and FIG.4 (b) is a figure which shows typically the shock absorbing material processed by the said manufacturing process. It is. FIG. 5 is an enlarged view of a cut portion of the cushioning material according to the embodiment. FIG. 6 is a schematic view illustrating a cushioning material according to an embodiment. FIG. 7 is a schematic view illustrating a cushioning material according to an embodiment. FIG. 8 is an enlarged view of a cut portion of the cushioning material according to the modification. FIG. 9 is a schematic view illustrating a buffer material according to a modification. FIG. 10 is a schematic view illustrating a buffer material according to a modification.

  Hereinafter, details of the embodiment will be described with reference to the drawings. However, the embodiment described below is merely an example, and the cushioning material according to the present disclosure is not limited to the specific configuration described below.

FIG. 1A and FIG. 1B show a die 10 for thermocompression bonding of a buffer material film (hereinafter simply referred to as a film) used for manufacturing the buffer material according to the present embodiment. The buffer material according to the present embodiment is manufactured by thermocompression bonding a thin film and a cylindrical film made of HDPE (High Density Polyethylene) as an example of a synthetic resin by the mold 10. FIG. 1A is a front view of a part of the mold 10, and FIG. 1B is a side view of the mold 10. The mold 10 includes a metal flat plate 11 and thermocompression bonding portions 12 and 13 protruding from the flat plate 11. The thermocompression bonding parts 12 and 13 correspond to an example of the first welding part and the second welding part. In the manufacture of the cushioning material according to this embodiment, after the mold 10 is heated, the thermocompression bonding portions 12 and 13 are brought into contact with the film, and the films are thermocompression bonded to each other. As shown in FIG. 1A, the thermocompression bonding parts 12 and 13 have a narrow part 14 having a narrow interval (length: L1) and a wide part 15 having a wide interval (length: L2). Is formed. The wide portion 15 is formed so as to be smoothly connected to the narrow portion 14. Thereby, when the film is filled with air, the pressure by the filled air can be prevented from being concentrated on the wide portion 15 as much as possible.

  2 (a) and 2 (b) show a perforation cutter 20 used for manufacturing the cushioning material according to the present embodiment. The perforation cutter 20 is used to form perforations and cuts in the cushioning film. 2A is a front view of a part of the perforation cutter 20, and FIG. 2B is a side view of the perforation cutter 20. FIG. The perforation cutter 20 has a metal flat plate 21. Further, the perforated cutter 20 has a blade body 22 in which a planar shape in a front view is a substantially isosceles triangle and a blade portion 22a is formed on two sides thereof. The perforation cutter 20 has a plurality of blade bodies 22, and each blade body 22 is arranged at a predetermined interval via a groove portion 25. In the present embodiment, a predetermined interval is assumed as the predetermined interval, but the blades 22 may be arranged at different intervals. Further, the perforation cutter 20 has a blade body 23 in which a blade portion 23a in which a plurality of blade portions similar to the blade portion 22a of the blade body 22 are continuous is formed. The blade body 23 is arranged adjacent to the blade body 22 through the groove 26. The blade body 22 corresponds to an example of a perforation forming part. The interval between the blade body 22 and the blade body 23 in the groove portion 26, that is, the width of the groove portion 26 is set to be wider than the interval between the blade bodies 22 in the groove portion 25, that is, the width of the groove portion 25.

  Further, the blade body 23 is provided with a blade body 24 made of a flat plate orthogonal to the flat plate 21. The blade body 24 is a rectangular flat plate, and the blade portion 24a is formed on one side of the blade body 23 on the same side as the side on which the blade portion 23a is provided. In the front view of the perforation cutter 20, the blade body 24 is provided so as to overlap with any vertex (vertex 23 b in the drawing) of the blade portion 23 a of the blade body 23. The blade bodies 23 and 24 correspond to an example of the notch forming portion.

  In the present embodiment, perforations for separating the cells of the buffer material described later are formed in the buffer material film by the plurality of blade bodies 22, and the buffer material film by the blade body 23 and the blade body 24 is substantially enough. A character-shaped cut (hereinafter simply referred to as a cut) is formed. Further, in the front view of the perforation cutter 20, the blade body 24 is provided at a position where the length from one end of the flat plate 21 is L3. By changing the length of L3, the position of the cut in the shock absorbing film is also changed.

  Next, the manufacturing method of the shock absorbing material in this embodiment is demonstrated. In this embodiment, perforations are formed in a thin HDPE film and a cylindrical film. As shown to Fig.3 (a), the film 30 is mounted in the work table 40 for perforation processing. In the figure, the film 30 is shown as a single sheet, but it is assumed that the film 30 is formed by flattening a cylindrical film and two films are overlapped.

  The work table 40 is provided with a groove 41 for receiving the blade bodies 22, 23, 24 of the perforation cutter 20. After the film 30 is placed on the work table 40, the perforation cutter 20 is moved in the direction indicated by the arrow in FIG. Then, the perforation cutter 20 is pierced into the film 30 from above the work table 40. At this time, the blade bodies 22, 23, and 24 of the perforation cutter 20 pass through the film 30 and are received in the groove 41. Next, the perforation cutter 20 is pulled out from the film 30. 3A shows four perforation cutters 20, the number of perforation cutters 20 to be used is not limited to this.

FIG. 3B shows an example of perforations 50a and cuts 50b formed in the film 30. FIG. In the film 30, a perforation 50 a is formed by the blade body 22 of the perforation cutter 20, and a cut 50 b is formed by the blade bodies 23 and 24 of the perforation cutter 20.

  Subsequently, the thermocompression bonding of the film 30 in which the perforation 50a and the cut 50b are formed is performed. As shown in FIG. 4A, the film 30 is placed on the work table 60. Then, the thermocompression-bonding mold 10 is moved in the direction indicated by the arrow in FIG. As a result, the film 30 is sandwiched between the mold 10 and the work table 60, and the film is thermocompression bonded by the mold 10. The contact position of the thermocompression bonding parts 12 and 13 of the mold 10 with respect to the film 30 is such that the perforation 50a and the cut 50b are sandwiched between the thermocompression bonding parts 12 and 13. The relative position is adjusted.

  FIG. 4B shows an example of the film 30 that has been thermocompression bonded. As shown in FIG. 4B, a thermocompression line 32 is formed on the film 30 by thermocompression bonding of the thermocompression bonding portion 12 of the mold 10. Similarly, a thermocompression line 33 is formed on the film 30 by thermocompression bonding of the thermocompression bonding portion 13 of the mold 10. The thermocompression bonding line 32 corresponds to an example of a boundary between the first thermocompression bonding portion and the first region where gas is injected, and the thermocompression bonding line 33 is injected with the second thermocompression bonding portion and gas. This corresponds to an example of the boundary of the second region. Further, as described above, the thermocompression bonding parts 12 and 13 have the wide width part 15. Accordingly, the narrow width portion 34 and the wide width portion 35, which are thermocompression bonding portions corresponding to the narrow width portion 14 and the wide width portion 15 of the thermocompression bonding portions 12 and 13, are formed on the film 30. In the wide portion 35, the cut 50 b is sandwiched between the thermocompression bonding lines 32 and 33. The thermocompression bonding lines 32 and 33 both reach the lower end 37 of the film 30.

  In the present embodiment, after the thermocompression lines 32 and 33 are formed on the film 30, the space between the two films constituting the film 30 is filled with air from the upper end 36 side of the film 30, and the upper end 36 side. The film 30 is sealed by thermocompression bonding. Thereby, the filled air is confined in the space formed by the thermocompression bonding on the thermocompression bonding lines 32 and 33 and the lower end 37 and the upper end 36 side of the film 30, and the cushioning material 70 of this embodiment is manufactured. The air filling and the sealing of the film 30 by thermocompression bonding may be performed as separate steps. For example, the film 30 may be filled with air and sealed using an apparatus different from the apparatus for manufacturing the film 30.

  In FIG. 5, the enlarged view of an example of the narrow part 34 and the wide part 35 of the film 30 shown in FIG.4 (b) is shown. As shown in FIG. 5, in the wide portion 35 of the thermocompression bonding lines 32, 33, a cut 50 b is formed at a position sandwiched between the thermocompression bonding lines 32, 33. In the present embodiment, the film 30 is manufactured such that the cuts 50b are formed in the wide portions 35 of the thermocompression bonding lines 32 and 33. If the thermocompression lines 32 and 33 do not have the wide portion 35 and the interval between the thermocompression lines 32 and 33 is constant, the thermocompression bonding is performed when the film 30 is thermocompression bonded by the thermocompression bonding portions 12 and 13 of the mold 10. When the positional deviation between the portions 12 and 13 and the film 30 occurs, the cut 50b may overlap the thermocompression lines 32 and 33.

  However, in the present embodiment, by configuring the thermocompression bonding parts 12 and 13 of the mold 10 so that the wide width part 35 is formed, even if the misalignment between the thermocompression bonding parts 12 and 13 and the film 30 occurs, The possibility that the notch 50b does not overlap with the thermocompression bonding lines 32 and 33 can be increased. Thereby, the yield at the time of manufacturing the film 30 of the buffer material of this embodiment can be increased. Further, in the thermocompression bonding lines 32 and 33, the wide portion 35 is formed only in a portion where the notch 50b is formed, and the other portion is a narrow portion 34, so that the wide portion 35 extends over the entire length of the thermocompression bonding lines 32 and 33. As compared with the case of providing the film, the capacity of the air filled in the film 30 can be increased.

6 and 7 schematically show an example of the cushioning material 70 manufactured in the present embodiment. The buffer material 70 is a film 30 that is filled with air and sealed. The cushioning material 70
A plurality of cells 70a filled with air are connected to each other by perforations 50a. The cell 70a corresponds to an example of a first region and a second region filled with gas. The user of the cushioning material 70 uses a necessary number of cells 70a separated from each other by the perforation 50a. The figure shows a state in which three cells 70a are connected to each other. For example, the user uses the cushioning material 70 for packing an article.

  A person who receives an article packed with the cushioning material 70 may tear the film of the cushioning material 70 from the cut 50b in order to reduce the volume by removing the air filled in the cushioning material 70 when the cushioning material 70 is discarded. it can. For example, when an operator who discards the cushioning material 70 tears the film of the cushioning material 70 by hand, the film of the cushioning material 70 is torn from the notch 50b toward another notch 50b (arrow 80 in the figure).

  In the cushioning material 70 according to the present embodiment, the notch 50b always exists at the end of the cushioning material 70 regardless of the number of the cells 70a. Therefore, the operator easily discards the cushioning material 70 using the notch 50b. It is possible. Since the notch 50b is adjacent to the wide portion 35, when the operator tears the film of the cushioning material 70 from the notch 50b, the wide portion 35 causes the notch 50b to cut toward another notch 50b. It is expected that the force that is applied during the operation is difficult to escape in directions other than the arrow 80. Further, when searching for the cut 50b, the operator can also check the position of the cut 50b using the wide portion 35 as a clue. Furthermore, since the width of the groove 26 of the perforation cutter 20 is wider than the width of the groove 25 as described above, the interval between the perforation 50a and the notch 50b is wide. Thereby, when the tear of a film reaches | attains the wide part 35, the effect which becomes easy to connect with the notch 50b rather than the perforation 50a is anticipated.

  Further, when the operator cuts the film of one cell 70a from the notch 50b to another notch 50b, the operator continuously cuts the film of another cell 70a toward another notch 50b (arrow 90 in the figure). be able to. As a result, as shown in FIG. 7, the operator can collectively extract the air from the plurality of cells 70 a by a single tearing operation. As described above, in the present embodiment, even when a plurality of cells 70a are connected in series, the volume can be reduced by cutting the cells 70a in a series of operations and removing air from the cells 70a. There is no need to remove the air of each cushioning material. Further, when the volume of the cushioning material 70 is reduced, the operator does not need to use a tool for making a hole in the cell 70a.

  Although the above description is about the present embodiment, the configuration of the cushioning material in the present invention can be variously modified within a range not losing the same identity as the technical idea of the present invention. For example, although the buffer material is manufactured using HDPE, other synthetic resins such as LDPE (Low Density Polyethylene) and polyethylene terephthalate (PET) may be used. In the above description, it is assumed that the film is filled with air, but other gases may be filled instead of air. Further, the shape of the wide portion formed by the thermocompression bonding line is not limited to the illustrated shape. In the above description, it is assumed that the buffer material is manufactured by thermocompression bonding of the film, but other welding techniques such as high frequency welding and ultrasonic welding may be used instead of thermocompression bonding.

Further, in the above-described embodiment, in the top view of the film 30 (FIG. 3B and FIG. 4B), the length of the perforation hole in the portion where the cut 50b is formed is formed by the cut 50b. It is comprised so that it may become longer than the length of the hole of the perforation 50a of the part which is not made. However, the length of the perforation hole in the portion where the cut 50b is formed may be the same as the length of the hole in the perforation 50a where the cut 50b is not formed. Further, the length of the perforation hole in the portion where the cut 50b is formed may be shorter than the length of the hole in the perforation 50a where the cut 50b is not formed. Incision 50
It may be formed so that b does not overlap with the perforation.

  FIGS. 8A to 8C show a modification of the above-described cut 50b. In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 8A, a substantially T-shaped cut 50c may be provided in place of the substantially cross-shaped cut 50b. Also in this case, the film 30 can be torn in the direction of the arrow 100 starting from the notch 50c. In addition, when a plurality of cells of the cushioning material are cut together at the same time as described above, an effect of continuously connecting the cuts from the cut 50c to another cut 50c is expected.

  Further, a cut 50d shown in FIG. 8B may be provided instead of the cuts 50b and 50c. The cut 50d is obtained by leaving only the cut substantially perpendicular to the perforation 50a out of the substantially cross-shaped cut 50b. Also in this case, the film 30 can be torn in the directions of the arrows 110 and 120 starting from the notch 50d. In addition, when a plurality of cells of the buffer material are cut at a time, an effect that the cut is continuously connected from one cut 50d to another cut 50d is expected.

  Further, a cut 50e shown in FIG. 8C may be provided instead of the cuts 50b, 50c, and 50d. The cut 50 e is a substantially V-shaped cut, and the apex 50 f is provided near the wide portion 35 of the thermocompression bonding line 32. Also in this case, the film 30 can be torn in the direction of the arrow 130 starting from the notch 50e. In addition, when a plurality of cells of the buffer material are cut at once, an effect that the cut is continuously connected from one cut 50e to another cut 50e is expected.

  9 and 10 show a cushioning material 170 according to a modified example of the cushioning material 70 described above. In the following description of the cushioning material 170, the same reference numerals are given to the same configurations as those of the cushioning material 70 according to the above-described embodiment, and detailed description thereof is omitted. The cushioning material 170 is a film 30 filled with air and sealed, and the cushioning material 170 has a plurality of cells 170a filled with air connected to each other by perforations 50a.

  A cut 150b having the same configuration as the cut 50b described above is formed along with each perforation 50a of each cell 170a. The cut 50b is formed at a position closer to the upper end 36 than the lower end 37 of the film 30 forming the cell 170a, and the cut 150b is formed at a position closer to the lower end 37 than the upper end 36 of the film 30. Note that the positions of the cuts 50b and 150b can be appropriately determined assuming a position where an operator who discards the cushioning material 170 can easily tear the film using the cuts 50b and 150b. And what is necessary is just to provide the wide part 15 of said metal mold | die 10, and the blade body 24 of the perforation cutter 20 so that the notches 50b and 150b may be formed in the film 30. FIG.

  An operator who discards the cushioning material 170 can tear the film of the cushioning material 170 from, for example, the notch 150b in order to reduce the volume by removing the air filled in the cushioning material 170 when discarding the cushioning material 170. As shown in FIG. 9, the worker who discards the buffer material 170 tears the film of the buffer material 170 from the notch 150b toward another notch 150b (arrow 180 in the figure). Since the notch 150b is formed in the same manner as the notch 50b, the force that acts when attempting to tear from the notch 150b toward another notch 150b is difficult to escape in directions other than the arrow 180, and the film tearing is wide. When reaching the portion 35, an effect of being easily connected to the cut 150b rather than the perforation 50a is expected.

Further, the operator can make one cell 170 from the notch 150b to another notch 150b.
When the film of a is torn, the film of another cell 170a can be further torn toward another notch 150b (arrow 190 in the figure). As a result, as shown in FIG. 10, the operator can remove the air from the plurality of cells 170a in a single tearing operation as in the case of reducing the volume of the cushioning material 70 using the cut 50b. It is not necessary to use a tool for making a hole in the cell 170a as in the prior art, and it does not take time and effort to remove air from each cushioning material. By providing a plurality of cuts in the perforation 50a, the operator can tear the film of the cell 170a without being aware of the top and bottom of the cushioning material 70. In this modification, it is possible to further form notches similar to the notches 50b and 150b in the perforation 50a, and to form three or more notches in the perforation 50a.

30 Film 32, 33 Thermocompression bonding line 34 Narrow part 35 Wide part 50a Perforation 50b, 150b Cut 70, 170 Buffer 70a, 170a Cell

Claims (3)

A film for cushioning material in which a gas is injected between the superimposed films,
The boundary of the first region into which the gas is injected is defined by the first welded portion of the cushioning film,
The boundary of the second region into which the gas is injected is defined by the second welded portion of the cushioning film,
A perforation for separating the first region and the second region is formed between the first welded portion and the second welded portion,
Cuts for tearing the cushioning material film are formed in a part of the perforations,
The interval between the first welded portion and the second welded portion in the portion including the cut of the perforation is the first welded portion and the second welded portion other than the portion including the cut. Wider than the distance between the welded parts,
A film for cushioning material. A method of manufacturing a film for a buffer material in which a gas is injected between the superimposed films,
Defining a boundary of a first region into which the gas is injected by forming a first welded portion in the cushioning film;
Defining a boundary of a second region into which the gas is injected by forming a second welded portion on the cushioning film;
Forming a perforation between the first welded portion and the second welded portion to separate the first region and the second region;
Forming a slit for cutting the film for cushioning material in a part of the perforation,
The interval between the first welded portion and the second welded portion in the portion including the cut of the perforation is the first welded portion and the second welded portion other than the portion including the cut. Wider than the distance between the welded parts,
The manufacturing method of the film for buffer materials characterized by the above-mentioned. An apparatus for producing a film for cushioning material in which a gas is injected between the superimposed films,
A first welded portion that defines a boundary of a first region into which the gas is injected by forming a first welded portion in the cushioning film;
A second weld portion that defines a boundary of a second region into which the gas is injected by forming a second weld portion on the cushioning film;
A perforation forming portion for forming a perforation for separating the first region and the second region between the first welded portion and the second welded portion;
A notch forming part for forming a notch for tearing the cushioning material film in a part of the perforation;
Have
The interval between the first welded portion and the second welded portion in the portion including the cut of the perforation is the first welded portion and the second welded portion other than the portion including the cut. Wider than the distance between the welded parts,
An apparatus for producing a film for cushioning material.

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