JP2009046603A - Resin sheet for impulse-type heat sealer and impulse-type heat sealer comprising the resin sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin sheet for an impulse-type heat sealer, capable of effectively preventing a to-be-sealed object from being transferred with a pattern undesirable in terms of appearance, and to provide an impulse-type heat sealer furnished with the resin sheet. <P>SOLUTION: A rectangular resin sheet 16 is formed by impregnating a fluororesin 23 in a fiber structure 20 which is formed by mutually knitting a plurality of first filaments 21 extending in parallel to one another in a first direction A1 and a plurality of second filaments 22 extending in parallel to one another in a second direction B1 crossing the first direction A1, wherein the first direction A1 and the second direction B2 are made to cross the longitudinal direction L of the resin sheet 16. Thereby, for the first filaments 21 and the second filaments 22, as development of variations in slackening tendency can be prevented, transfer of a pattern undesirable in terms of appearance onto a to-be-sealed object due to slackening only some of the filaments can be effectively prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a resin sheet for an impulse heat sealer that conducts heat from a heater that is in contact with the object to be sealed and is intermittently driven to the object to be sealed, and an impulse heat having the same. It is about the sealer.

  There is known an impulse heat sealer that includes a heater for heating an object to be sealed, and drives the heater intermittently to thermally weld the object to be sealed (see, for example, Patent Document 1). This type of heat sealer is generally provided with a resin sheet that comes into contact with the object to be sealed, and heat from the heater is conducted to the object to be sealed through the resin sheet. The resin sheet is formed using, for example, a fluororesin in order to make it easy to peel off the object to be sealed from the resin sheet after heat welding.

  In the impulse heat sealer, the resin sheet is pressed against the object to be sealed, and the heater is driven only when the resin sheet is pressed. That is, when sequentially heat-sealing a plurality of objects to be sealed, the objects to be sealed are sequentially set and the resin sheet is pressed against the objects to be sealed, and the heater is intermittently driven only at the time of each pressure contact. As a result, the objects to be sealed are thermally welded.

  FIG. 5 is a view showing an example of a resin sheet 116 used in a conventional impulse heat sealer, where (a) is a plan view of the resin sheet 116, and (b) is a cut view of the sheet structure 1. The mode at the time of forming the resin sheet 116 of (a) is each shown.

  The resin sheet 116 is formed in a rectangular shape by impregnating a fiber structure 120 composed of a plurality of glass fibers 121 and 122 knitted together with a fluororesin. The plurality of glass fibers 121 and 122 are composed of a plurality of first fibers 121 and second fibers 122 extending in a direction orthogonal to each other, and each first fiber 121 extends in parallel at a predetermined interval, and each second fiber The fibers 122 are knitted in a lattice shape so as to extend in parallel with each other at a predetermined interval. In FIG. 5, the distance between the glass fibers 121 and 122 is longer than the actual distance for easy understanding.

  The resin sheet 116 is manufactured by appropriately cutting the sheet structure 1 formed by weaving a plurality of glass fibers 121 and 122 and impregnating with a fluororesin. More specifically, as shown in FIG. 5B, along the direction A3 in which the first fibers 121 extend and the direction B3 in which the second fibers 122 extend, the sheet as shown by the broken line in FIG. 5B. By cutting the structure 1, a resin sheet 116 as shown in FIG. 5A is manufactured.

The resin sheet 116 manufactured in this way is formed in a rectangular shape whose long side extends along the direction A3 and whose short side extends along the direction B3. Therefore, the length of each first fiber 121 is the same as the length of the long side of the resin sheet 116, and the length of each second fiber 122 is the same as the length of the short side of the resin sheet 116. Yes.
JP 2003-48250 A

  However, the conventional resin sheet 116 as described above expands due to heat received from the heater when the object to be sealed is thermally welded, and as shown in FIG. May occur. Such glass fiber slack 125 is particularly likely to occur in the first fibers 121 longer than the second fibers 122.

  As described above, when the slack 125 is generated in a part of the glass fiber, when the heat sealing is performed on the object to be sealed in that state, the portion of the glass fiber slack 125 in the object to be sealed is press-contacted. There is a problem that an undesirable pattern is transferred.

  In particular, in the impulse heat sealer, since the heater is intermittently driven, the resin sheet is repeatedly heated and cooled, and therefore, a phenomenon that a part of the woven glass fiber is loosened easily occurs. The problem is particularly noticeable.

  The present invention has been made in view of the above circumstances, and an impulse heat sealer resin sheet that can effectively prevent a pattern that is not preferable in appearance from being transferred to an object to be sealed, and an impulse heat including the same. The purpose is to provide a sealer. Another object of the present invention is to provide an impulse heat sealer resin sheet with improved durability and an impulse heat sealer including the resin sheet.

  A resin sheet for an impulse heat sealer according to the first aspect of the present invention is an impulse heat for contacting and heat-welding heat from a heater driven intermittently to the object to be sealed. A resin sheet for a sealer, each of a plurality of first fibers extending in parallel with each other in the first direction, and a plurality of second fibers extending in parallel with each other in a second direction intersecting with the first direction, respectively. Is formed by impregnating a fluororesin with respect to the fiber structure formed by weaving, and has a rectangular shape with long sides extending in a direction intersecting both the first direction and the second direction. It is formed.

  According to such a configuration, a rectangular impulse heat sealer resin sheet having a long side extending in a direction intersecting both the first direction in which each first fiber extends and the second direction in which each second fiber extends is provided. can do. Thereby, compared with the conventional structure in which one of the 1st fiber and the 2nd fiber extends along the longitudinal direction of a resin sheet, the length of the 1st fiber and the 2nd fiber can be approximated more.

  Therefore, since it is possible to suppress variation in ease of loosening between the first fiber and the second fiber, only a part of the fibers are loosened, resulting in an unfavorable appearance on the sealed object. The transfer can be effectively prevented and the durability can be further improved.

  In the resin sheet for an impulse heat sealer according to the second aspect of the present invention, the plurality of first and second fibers are orthogonal to each other, and the long side is at an angle of 45 ° with respect to the first direction. And extending in a direction intersecting with the second direction at an angle of 45 °.

  According to such a configuration, since the lengths of the first fiber and the second fiber can be approximated, it is possible to effectively suppress variation in ease of loosening between the first fiber and the second fiber. It is possible to more effectively prevent a pattern that is not preferable in appearance from being transferred to the object to be sealed due to the fact that only some of the fibers are loosened, and it is possible to further improve the durability.

  A resin sheet for an impulse heat sealer according to a third aspect of the present invention is characterized in that the plurality of first and second fibers are formed to have the same length.

  According to such a configuration, since the first fiber and the second fiber have the same length, it is possible to effectively suppress variation in ease of loosening between the first fiber and the second fiber. In addition, it is possible to more effectively prevent a pattern that is not preferable in appearance from being transferred to the object to be sealed due to the loosening of only some of the fibers, and it is possible to further improve the durability.

  An impulse heat sealer according to a fourth aspect of the present invention is a heater for heating an object to be sealed, and abutting against the object to be sealed, for conducting heat from the heater to the object to be sealed and thermally welding it. A resin sheet and heater driving means for intermittently driving the heater, wherein the resin sheet intersects the first direction with a plurality of first fibers extending in parallel to each other in the first direction. The fiber structure formed by weaving a plurality of second fibers extending in parallel to each other in the second direction is formed by impregnating a fluororesin, and the first direction and the first It is formed in a rectangular shape with long sides extending in a direction intersecting both of the two directions.

  According to such a configuration, it is possible to provide an impulse heat sealer that exhibits the same effects as those of the first aspect of the present invention. That is, according to this impulse heat sealer, it is possible to effectively prevent a pattern that is not preferable in appearance from being transferred to an object to be sealed due to the fact that only some of the fibers are loosened, and more durable. Can be improved.

  According to the present invention, since it is possible to suppress variation in ease of loosening between the first fiber and the second fiber, only a part of the fibers are loosened, resulting in an appearance on the sealed object. It is possible to effectively prevent an undesirable pattern from being transferred and to further improve durability.

<First Embodiment>
FIG. 1 is a cross-sectional view illustrating a configuration example of a heat sealer according to a first embodiment of the present invention. This heat sealer is an impulse heat sealer that includes a heater 4 for heating an object to be sealed and heats the object to be sealed by intermittently driving the heater 4. The object to be sealed is, for example, a packaging bag made of a resin film, and the opening can be closed by heat welding using the heat sealer.

  This heat sealer is provided with a base portion 11 on which the heater 4 is mounted, and a pressure contact lever 12 that is rotatably attached to the base portion 11. A heating part 10 including the heater 4 is formed on the upper surface of the base part 11, and a pressing part 18 is formed at a position corresponding to the heating part 10 on the lower surface of the pressing lever 12. Therefore, the object to be sealed on the heating unit 10 can be sandwiched and pressed from above by the pressing unit 18 by rotating the pressure contact lever 12 with the object to be sealed placed on the heating unit 10. . The pressure contact portion 18 is formed of an elastic body such as silicon rubber.

  The heater 4 is provided on a seal support 15 formed on the upper surface of the base 11, and the upper side of the heater 4 is covered with a resin sheet 16. The object to be sealed is placed on the resin sheet 16, and heat from the heater 4 is conducted to the object to be sealed through the resin sheet 16. The heater 4 is a linear heater and has an elongated shape in the left-right direction in FIG. The resin sheet 16 has an elongated shape in the left-right direction in FIG. 1 corresponding to the heater 4, and is formed using a fluororesin, so that an object to be sealed is easily peeled off from the resin sheet 16 after heat welding. It has become. Both end portions of the heater 4 in the longitudinal direction are fixed to the base portion 11 by a fixing tool such as a screw 17.

  Inside the base unit 11, a timer mechanism 13 and a transformer (transformer) 14 are provided. When the pressure contact lever 12 is rotated to a position facing substantially parallel to the resin sheet 16, a switch (not shown) is turned on, so that the heater 4 is automatically activated by the drive voltage supplied from the transformer 14. The heater 4 is driven, and the drive of the heater 4 is stopped based on an output signal from the timer mechanism 13 after a predetermined time has elapsed. That is, the switch, the timer mechanism 13 and the transformer 14 are heater driving means for driving the heater 4 intermittently by driving the heater 4 only for a predetermined time at the time of pressure contact and stopping the driving of the heater 4 otherwise. It is composed.

  Therefore, when the object to be sealed is thermally welded using this heat sealer, the pressure contact lever 12 is rotated in a state where the object to be sealed is placed on the resin sheet 16, and the heating unit 10 and the pressure contact unit 18 are By sandwiching the object to be sealed in between, the portion where the object to be sealed is sandwiched is automatically heated by the heat from the heater 4. And based on the output signal from the timer mechanism 13, the heat | fever welding of the to-be-sealed object is completed by the drive of the heater 4 being stopped automatically after predetermined time progress. Thus, by driving the heater 4 intermittently, the heater 4 can be driven and heated for a necessary time, so that the amount of power used can be reduced and the objects to be sealed are more than necessary. It is possible to prevent the problem of being cut by heating.

  2A and 2B are diagrams illustrating an example of the resin sheet 16, in which FIG. 2A is a plan view of the resin sheet 16, and FIG. 2B is a view when the sheet structure 1 is cut to form the resin sheet 16 in FIG. Each of the embodiments is shown. FIG. 3 is a partially enlarged plan view of the resin sheet 16 of FIG.

  The resin sheet 16 is a rectangular fluororesin-impregnated glass cloth formed by impregnating a fluororesin 23 into a fiber structure 20 composed of a plurality of glass fibers 21 and 22 knitted together. The long side of the resin sheet 16 applied to the heat sealer is about 20 cm for a short one and about 3 m to 4 m for a long one. On the other hand, the short side of the resin sheet 16 applied to the heat sealer is about 2 mm to 10 mm. That is, the resin sheet 16 applied to the heat sealer has a long side that is very long compared to the short side, and the long side is 20 times longer than the short side.

  The plurality of glass fibers 21 and 22 are composed of a plurality of first fibers 21 and second fibers 22 extending in a direction orthogonal to each other, and each first fiber 21 extends in parallel at a predetermined interval, and each second fiber The fibers 22 are knitted in a lattice shape so as to extend in parallel with each other at a predetermined interval. The interval between the first fibers 21 and the interval between the second fibers 22 may be the same or different. By impregnating the fiber structure 20 knitted in this way with the fluororesin 23, the entire fiber structure 20 is covered with the fluororesin 23, and the resin sheet 16 having high heat resistance and high peelability is formed. 2 and 3, in order to make the explanation easy to understand, the length of the long side with respect to the short side of the resin sheet 16 is expressed to be shorter than the actual length, and the distance between the glass fibers 21 and 22 is set to be longer than the actual length. It represents long.

  The resin sheet 16 is manufactured by appropriately cutting the sheet structure 1 formed by weaving a plurality of glass fibers 21 and 22 and impregnating the fluororesin 23. More specifically, as shown in FIG. 2B, in a direction intersecting both the direction A1 (first direction) in which the first fibers 21 extend and the direction B1 (second direction) in which the second fibers 22 extend. Along with this, the sheet structure 1 is cut as shown by broken lines in FIG. 2B, whereby a resin sheet 16 as shown in FIG. 2A is manufactured.

In the resin sheet 16 manufactured in this way, as shown in FIG. 3, the direction A1 in which each first fiber 21 extends intersects the longitudinal direction L of the resin sheet 16 at an angle θ _A1 . The direction B1 in which the two fibers 22 extend intersects the longitudinal direction L of the resin sheet 16 at an angle θ _B1 . In this example, the angles θ _A1 and θ _B1 are both 45 ° and the same angle. Therefore, the plurality of first fibers 21 and the plurality of second fibers 22 respectively extending from one long side to the other long side of the resin sheet 16 have the same length.

  In the present embodiment, a rectangular impulse heat sealer resin sheet 16 having a long side extending in a direction L intersecting both a direction A1 in which each first fiber 21 extends and a direction B1 in which each second fiber 22 extends is provided. be able to. Thereby, compared with the conventional structure in which one of the first fiber and the second fiber extends along the longitudinal direction of the resin sheet, the lengths of the first fiber 21 and the second fiber 22 can be more approximated. it can.

  Therefore, since it is possible to suppress variations in the ease of loosening between the first fiber 21 and the second fiber 22, only some of the fibers are loosened, which is undesirable in terms of appearance to the sealed object. The pattern can be effectively prevented from being transferred, and the durability can be further improved.

  In particular, in this embodiment, the direction A1 in which each first fiber 21 extends and the direction B1 in which each second fiber 22 extends intersect each other at an angle of 45 ° with respect to the longitudinal direction L of the resin sheet 16, and a plurality of The first fibers 21 and the plurality of second fibers 22 have the same length. Thereby, it can suppress effectively that dispersion | variation arises in the ease of loosening with the 1st fiber 21 and the 2nd fiber 22, and it originates in only a part of fiber loosening, and it is an appearance to a to-be-sealed thing In addition, it is possible to more effectively prevent an undesirable pattern from being transferred, and to further improve durability.

Second Embodiment
In the first embodiment, a configuration in which the direction A1 in which each first fiber 21 extends and the direction B1 in which each second fiber 22 extends intersects with the longitudinal direction L of the resin sheet 16 at an angle of 45 °. Explained. On the other hand, in the second embodiment, the direction A2 in which each first fiber 21 extends and the direction B2 in which each second fiber 22 extends intersect with the longitudinal direction L of the resin sheet 16 at an angle other than 45 °. Is different.

  FIG. 4 is a partially enlarged plan view of the resin sheet 16 in the heat sealer according to the second embodiment of the present invention. Since this resin sheet 16 has the same configuration as the resin sheet 16 of the first embodiment except that the direction A2 in which each first fiber 21 extends and the direction B2 in which each second fiber 22 extends are different, About the same structure, the same code | symbol shall be attached | subjected to a figure and the description shall be abbreviate | omitted.

In the present embodiment, the direction A2 in which each first fiber 21 extends intersects the longitudinal direction L of the resin sheet 16 at an angle θ _A2 , and the direction B2 in which each second fiber 22 extends corresponds to the longitudinal direction of the resin sheet 16. Crosses L at an angle θ _B2 . In this example, the angles θ _A2 and θ _B2 are both the same angle larger than 45 ° and smaller than 90 °. However, the present invention is not limited to this configuration, and both are the same angle less than 45 °. The angle θ _A2 and the angle θ _B2 may be different from each other.

  As in the present embodiment, the direction A2 in which each first fiber 21 extends and the direction B2 in which each second fiber 22 extends intersect the longitudinal direction L of the resin sheet 16 at an angle other than 45 °. Even in such a case, if the long side of the resin sheet 16 extends in the direction L intersecting both the direction A2 in which each first fiber 21 extends and the direction B2 in which each second fiber 22 extends, The length of the 1st fiber 21 and the 2nd fiber 22 can be approximated more. Thereby, since it is possible to suppress variation in ease of loosening between the first fiber 21 and the second fiber 22, it is preferable in terms of appearance to the object to be sealed because only some of the fibers are loosened. It is possible to effectively prevent the transfer of no pattern, and to further improve the durability.

  In particular, in the present embodiment, the plurality of first fibers 21 and the plurality of second fibers 22 respectively extending from one long side to the other long side of the resin sheet 16 have the same length. Variations in the ease of loosening between the fibers 21 and the second fibers 22 can be effectively suppressed, and due to the fact that only some of the fibers are loosened, there is a pattern that is unfavorable in appearance on the sealed object. The transfer can be prevented more effectively and the durability can be further improved.

  In the above embodiment, although the heat sealer provided with the base part 11 with which the heater 4 was mounted | worn and the press-contact lever 12 rotatably attached with respect to this base part 11 was demonstrated as an example, this book The resin sheet 16 according to the invention is applicable not only to the heat sealer having the above-described configuration but also to various heat sealers as long as the resin sheet 16 is an impulse heat sealer in which a heater is intermittently driven to thermally weld an object to be sealed. It is.

It is sectional drawing which showed the structural example of the heat sealer which concerns on 1st Embodiment of this invention. It is the figure which showed an example of the resin sheet, (a) is a top view of a resin sheet, (b) has each shown the aspect at the time of cut | disconnecting a sheet structure and forming the resin sheet of (a). FIG. 3 is a partially enlarged plan view of the resin sheet of FIG. 2. It is a partially expanded plan view of the resin sheet in the heat sealer according to the second embodiment of the present invention. It is the figure which showed an example of the resin sheet used for the conventional impulse heat sealer, (a) is a top view of a resin sheet, (b) cut | disconnects a sheet | seat structure, and shows the resin sheet of (a). The mode at the time of forming is shown, respectively. FIG. 6 is a partially enlarged plan view of the resin sheet of FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet structure 4 Heater 10 Heating part 13 Timer mechanism 14 Transformer 16 Resin sheet 20 Fiber structure 21 1st fiber 22 2nd fiber 23 Fluororesin

Claims (4)

A resin sheet for an impulse heat sealer that abuts on an object to be sealed and conducts heat from a heater that is intermittently driven to the object to be sealed and heat-welded,
A plurality of first fibers each extending in parallel with each other in the first direction and a plurality of second fibers extending in parallel with each other in the second direction intersecting with each of the first directions are formed by weaving. The fiber structure is formed by impregnating with a fluororesin, and is formed in a rectangular shape having long sides extending in a direction intersecting both the first direction and the second direction. Resin sheet for impulse heat sealers. The plurality of first and second fibers are orthogonal to each other,
The long side extends in a direction intersecting with the first direction at an angle of 45 ° and intersecting with the second direction at an angle of 45 °. The resin sheet for impulse type heat sealers of description.   The resin sheet for an impulse heat sealer according to claim 1 or 2, wherein the plurality of first and second fibers are formed to have the same length. A heater for heating an object to be sealed;
A resin sheet that contacts the object to be sealed and conducts heat from the heater to the object to be sealed and thermally welds;
Heater driving means for intermittently driving the heater,
The resin sheet is knitted with a plurality of first fibers extending in parallel with each other in the first direction and a plurality of second fibers extending in parallel with each other in a second direction intersecting with the first direction, respectively. The fiber structure is formed by impregnating with a fluororesin, and is formed in a rectangular shape having long sides extending in a direction intersecting both the first direction and the second direction. Impulse heat sealer characterized by

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