JPS626978B2 - - Google Patents
Info
- Publication number
- JPS626978B2 JPS626978B2 JP54168235A JP16823579A JPS626978B2 JP S626978 B2 JPS626978 B2 JP S626978B2 JP 54168235 A JP54168235 A JP 54168235A JP 16823579 A JP16823579 A JP 16823579A JP S626978 B2 JPS626978 B2 JP S626978B2
- Authority
- JP
- Japan
- Prior art keywords
- resin film
- belt
- cooling
- heating
- pair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
Landscapes
- Closing Of Containers (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は改良された樹脂フイルムの接着方法お
よびその装置に関する。
樹脂フイルム、たとえばポリエチレンフイルム
やポリプロピレンフイルムなどの接着や該フイル
ムを素材とした袋の封緘のために連続式ヒートベ
ルト接着機が用いられている。このヒートベルト
接着機は保守が容易であるという利点を有してい
るが、非連続式のヒートバー接着機に比し、例え
ば高ブロー比の高密度ポリエチレンフイルムの場
合、接着強さが弱いという欠点があつた。この欠
点はベルト速度の遅速調節によつても解消しない
ことが知られている。
そこで本発明者らは、この原因を追求した結
果、重ね合わされた樹脂フイルムを加熱して熱接
着したとき、外側の、すなわちヒートベルトに接
する樹脂フイルムが該フイルムの接着部分を挾
持、移送するヒートベルトに付着または熱融着す
るため、樹脂フイルムの接着部分の自由収縮が妨
げられたまま冷却区域へ送られて接着作業が完了
することに原因があることを見出した。本発明は
かかる知見に基いてなされたものであり、ヒート
ベルト接着機の加熱区域と冷却区域の中間におい
て熱接着された樹脂フイルムをベルトから遊離せ
しめて収縮の機会を与えるようにした樹脂フイル
ムの接着方法およびその装置を提供することを目
的としている。
本発明は、１対のベルトに挾持された樹脂フイ
ルムを加熱区域と冷却区域を通過せしめることに
より樹脂フイルムの接着を行なう方法において、
加熱区域を通過して熱接着された樹脂フイルムを
冷却区域に至るまでの間にベルトから遊離させて
収縮させることを特徴とする改良された樹脂フイ
ルムの接着方法を提供するものであり、かつ該接
着方法を行なうための装置として樹脂フイルムを
挾持、移送しうるように並設した１対の無端ベル
ト、該ベルトの駆動機構、前記樹脂フイルムの移
送区間に設けられた加熱機構と冷却機構ならびに
該加熱機構と該冷却機構の中間において樹脂フイ
ルムとベルトとの接触を解除するための機構を備
えた樹脂フイルムの接着用装置を提供するもので
ある。
本発明の方法および装置を図面に基いて説明す
る。
本発明を適用しうる樹脂フイルムはポリエチレ
ン、ポリプロピレン、塩化ビニル樹脂などの熱可
塑性樹脂のフイルムであり、特に高密度ポリエチ
レンの高ブロー比フイルムの如く従来法では十分
なシール強さが得られなかつた樹脂フイルムに適
用することにより好結果が得られる。
第１図および第２図は樹脂フイルムを素材とし
た袋の封緘をする場合を説明するための平面図と
側面図であるが、装置の詳細や本発明に直接関係
しない部分は省略されている。
樹脂フイルム袋１は袋の支持・移送用ベルト２
により熱接着工程に移送され、該袋の被接着部分
は該樹脂フイルム袋を挾持、移送するように並設
された１対の無端ベルト３，３′によつて挾持さ
れる。次いで、樹脂フイルム袋はこの状態で加熱
区域に送られ、ここでヒートシーラーなどの加熱
機構４により被接着部分の加熱接着が行なわれ
る。加熱接着された樹脂フイルム袋の熱接着部分
は冷却区域に至るまでの間にベルト３，３′から
遊離させて収縮する機会を与えられる。
樹脂フイルム袋１の熱接着部分とベルト３，
３′との接触（本発明では接触、付着および熱融
着を包含する意味で用いている。）を解除するた
めの機構としては種々の態様が可能であり、たと
えば第３図に示した如き１対の板状体５，５′を
連結用部材６を介して平行に配置せしめ、樹脂フ
イルム袋の熱接着部分は該板状体５，５′の間隙
を通過させ、ベルト３，３′は該板状体５，５′の
外側を通過するようにした機構がある。この場
合、板状体５，５′のベルト上流側端部を第３図
ｄに示したように刃状とすることにより、ベルト
と樹脂フイルムの遊離を円滑に行なわしめること
ができる。第４図はこの機構を用いた場合を例示
した平面図であり、熱接着されたフイルムがベル
トから遊離される状態を示している。
別の機構として、第５図に示したように加熱機
構４の下流側に１群のプーリー７ａ，７ｂ，……
を設けたものがある。図示したように、１群のプ
ーリー７ａ，７ｂ，……を適当な位置に配置せし
めてベルト３，３′を側離（バイパス）させて樹
脂フイルム袋１のヒートシール部分と遊離させる
ものである。すなわちベルト３はプーリー７ａ，
７ｃ，７ｅおよび７ｇにより、ベルト３′はプー
リー７ｂ，７ｄ，７ｆおよび７ｈにより側離させ
て樹脂フイルム袋１の熱接着部分との接触を解除
せしめる。この場合、プーリー７ａ，７ｂは図示
したようにベルトを押えるプーリーと該プーリー
に遊嵌しており樹脂フイルム袋の熱接着部分のベ
ルト側への進行を阻止するプーリーから成つてい
る。ベルトとの接触を解除された該熱接着部分は
プーリー７ｃ，７ｄ等により移送される間に収縮
をする。なお、この機構は通過する樹脂フイルム
袋の熱接着部分からの受熱および摩擦熱等により
加熱され、そのため樹脂フイルム袋の移送に際し
スチツクアンドスリツプ現象を生起するおそれが
あるので、必要に応じて冷却装置を付設して適当
な個所を冷却することもある。
収縮した熱接着部分は再び合流して並進するベ
ルト３，３′によつて挾持され、冷却区域へ移送
される。冷却区域では自然放冷の他、強制空冷方
式、水冷方式の装着などの冷却機構８により熱接
着部分の冷却を行なう。熱接着部分の冷却処理に
より樹脂フイルムの接着作業は終了する。
本発明によれば、樹脂フイルムの被接着部分を
熱接着した後、該部分をベルトから遊離して収縮
を行なわせ、しかる後に冷却するため、十分なシ
ール強さを得ることができる。そのため、たとえ
ば高密度ポリエチレンの高ブロー比フイルムを素
材として袋を制作した場合、被接着部分のシール
強さが大きく重包装分野、特に５〜30Kgの容量の
重袋分野への適用を図ることが可能である。
本発明による効果を明らかにするため、各種樹
脂フイルムの熱接着を第４図に示した手法を適用
して行ない、従来法による場合と比較した。シー
ル強さの測定結果を表−１に示す。
【表】DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved resin film bonding method and apparatus. Continuous heat belt adhesive machines are used for adhering resin films, such as polyethylene films and polypropylene films, and for sealing bags made from such films. This heat belt adhesive machine has the advantage of being easy to maintain, but has the disadvantage that, compared to discontinuous heat bar adhesive machines, the adhesive strength is weaker, for example, in the case of high-density polyethylene film with a high blow ratio. It was hot. It is known that this drawback is not overcome even by slow adjustment of the belt speed. The inventors of the present invention investigated the cause of this problem, and found that when superimposed resin films are heated and thermally bonded, the resin film on the outside, that is, in contact with the heat belt, clamps and transfers the adhesive part of the film. It has been found that the cause is that the adhesive portion of the resin film is sent to the cooling area while the adhesion portion is prevented from freely shrinking due to adhesion or heat-sealing to the belt, thereby completing the adhesion work. The present invention has been made based on this knowledge, and provides a resin film that is thermally bonded between the heating zone and the cooling zone of a heat belt bonding machine so that the resin film is separated from the belt and given an opportunity to shrink. The object of the present invention is to provide a bonding method and device. The present invention provides a method for bonding resin films by passing the resin film held between a pair of belts through a heating zone and a cooling zone.
The present invention provides an improved resin film bonding method characterized in that the resin film that has been thermally bonded after passing through a heating zone is released from a belt and shrunk before reaching a cooling zone, and The device for carrying out the bonding method includes a pair of endless belts arranged side by side so that the resin film can be held and transferred, a driving mechanism for the belts, a heating mechanism and a cooling mechanism provided in the transfer section of the resin film, and An object of the present invention is to provide a resin film bonding device that is provided with a mechanism for releasing the contact between the resin film and the belt between the heating mechanism and the cooling mechanism. The method and apparatus of the present invention will be explained based on the drawings. The resin film to which the present invention can be applied is a film made of thermoplastic resin such as polyethylene, polypropylene, or vinyl chloride resin, and is particularly suitable for films for which sufficient sealing strength could not be obtained by conventional methods, such as high-blow ratio films made of high-density polyethylene. Good results can be obtained by applying it to resin films. 1 and 2 are a plan view and a side view for explaining the case of sealing a bag made of resin film, but details of the device and parts not directly related to the present invention are omitted. . The resin film bag 1 has a belt 2 for supporting and transporting the bag.
The bag is transferred to a thermal bonding process, and the part of the bag to be bonded is held between a pair of endless belts 3, 3' arranged in parallel so as to hold and transfer the resin film bag. Next, the resin film bag is sent in this state to a heating area, where the parts to be adhered are thermally bonded by a heating mechanism 4 such as a heat sealer. The heat-bonded portion of the heat-bonded resin film bag is released from the belts 3, 3' and given an opportunity to shrink before reaching the cooling section. Thermal bonding part of resin film bag 1 and belt 3,
Various embodiments are possible as a mechanism for releasing the contact (in the present invention, it is used to include contact, adhesion, and heat fusion) with 3'; A pair of plate-shaped bodies 5, 5' are arranged in parallel via a connecting member 6, and the heat-bonded portion of the resin film bag is passed through the gap between the plate-shaped bodies 5, 5', and the belts 3, 3' There is a mechanism for passing the outside of the plate-like bodies 5, 5'. In this case, by forming the upstream end of the belt of the plate-shaped bodies 5, 5' into a blade shape as shown in FIG. 3d, the belt and the resin film can be smoothly separated. FIG. 4 is a plan view illustrating a case where this mechanism is used, and shows a state in which the thermally bonded film is released from the belt. As another mechanism, as shown in FIG. 5, a group of pulleys 7a, 7b, . . . are provided downstream of the heating mechanism 4.
There are some that have . As shown in the figure, a group of pulleys 7a, 7b, . . That is, the belt 3 is connected to the pulley 7a,
7c, 7e, and 7g, the belt 3' is separated from the side by pulleys 7b, 7d, 7f, and 7h, and is released from contact with the thermally bonded portion of the resin film bag 1. In this case, the pulleys 7a and 7b consist of a pulley that presses the belt and a pulley that loosely fits into the pulley and prevents the thermally bonded portion of the resin film bag from advancing toward the belt, as shown in the figure. The thermally bonded portion released from contact with the belt contracts while being transferred by pulleys 7c, 7d, etc. Note that this mechanism is heated by the heat received from the thermally bonded part of the resin film bag that passes through it, as well as by frictional heat, which may cause a stick-and-slip phenomenon when the resin film bag is transferred, so it must be cooled down as necessary. Equipment may also be attached to cool appropriate locations. The contracted heat-bonded parts rejoin and are clamped by the translating belts 3, 3' and transported to the cooling section. In the cooling zone, in addition to natural cooling, the thermally bonded portion is cooled by a cooling mechanism 8 such as a forced air cooling system or a water cooling system. The resin film bonding work is completed by cooling the heat bonded portion. According to the present invention, after the bonded portion of the resin film is thermally bonded, the portion is released from the belt to be contracted and then cooled, so that sufficient sealing strength can be obtained. Therefore, for example, when a bag is made from high-density polyethylene film with a high blow ratio, the sealing strength of the adhesive part is large, making it suitable for use in heavy-duty packaging, especially heavy-duty bags with a capacity of 5 to 30 kg. It is possible. In order to clarify the effects of the present invention, various resin films were thermally bonded using the method shown in FIG. 4, and compared with the conventional method. The measurement results of seal strength are shown in Table 1. 【table】
第１図は本発明の装置の１態様の概念を示す平
面図、第２図はその側面図、第３図は樹脂フイル
ムの熱接着部分とベルトとの接触を解除させる機
構の１態様を示すものでａは平面図、ｂは正面
図、ｃは側面図、ｄはｃの板状体のＡ−A′断面
図である。第４図は第３図の機構の使用状態を示
す平面図であり、第５図は別の機構の使用状態を
示す平面図である。第６図〜第８図は第３図ａ〜
ｃに示した機構の他の態様を示したものであり、
それぞれのａは平面図、ｂは正面図、ｃは側面図
である。
１……樹脂フイルム袋、２……樹脂フイルム袋
の支持・移送用ベルト、３，３′……樹脂フイル
ム袋の被接着部分の挾持・移送用無端ベルト、４
……加熱機構、５，５′……板状体、６……連結
用部材、７ａ，７ｂ……プーリー、８……冷却機
構、９，９′……動輪、１０，１０′……動輪、１
１……結合具、１２……ガイド。
Fig. 1 is a plan view showing the concept of one embodiment of the device of the present invention, Fig. 2 is a side view thereof, and Fig. 3 is an embodiment of the mechanism for releasing the contact between the thermally bonded portion of the resin film and the belt. In the figure, a is a plan view, b is a front view, c is a side view, and d is a sectional view taken along line A-A' of the plate-like body of c. FIG. 4 is a plan view showing the mechanism shown in FIG. 3 in use, and FIG. 5 is a plan view showing another mechanism in use. Figures 6 to 8 are Figures 3a to 8.
This shows another aspect of the mechanism shown in c.
In each case, a is a plan view, b is a front view, and c is a side view. 1... Resin film bag, 2... Belt for supporting and transporting the resin film bag, 3, 3'... Endless belt for holding and transporting the adhered portion of the resin film bag, 4
... Heating mechanism, 5, 5' ... Plate body, 6 ... Connection member, 7a, 7b ... Pulley, 8 ... Cooling mechanism, 9, 9' ... Driving wheel, 10, 10' ... Driving wheel ,1
1... Connector, 12... Guide.
Claims (1)
熱区域と冷却区域を通過せしめることにより樹脂
フイルムの接着を行なう方法において、加熱区域
を通過して熱接着された樹脂フイルムを冷却区域
に至るまでの間にベルトから遊離させて収縮させ
ることを特徴とする改良された樹脂フイルムの接
着方法。 ２ 樹脂フイルムを挾持、移送しうるように並設
した１対の無端ベルト、該ベルトの駆動機構、前
記樹脂フイルムの移送区間に設けられた加熱機構
と冷却機構ならびに該加熱機構と該冷却機構の中
間において樹脂フイルムとベルトとの接触を解除
するための機構を備えた樹脂フイルムの接着用装
置。 ３ 加熱機構と冷却機構の中間において樹脂フイ
ルムとベルトとの接触を解除するための機構が、
該加熱機構の下流側に１対の板状体を連結用部材
を介して平行に配置せしめ、該板状体の間を樹脂
フイルムを通過させ、ベルトは該板状体の外側を
通過するようにした機構である特許請求の範囲第
２項記載の装置。 ４ １対の板状体のそれぞれのベルト上流側端部
を刃状とした特許請求の範囲第３項記載の装置。 ５ 加熱機構と冷却機構の中間において樹脂フイ
ルムとベルトとの接触を解除するための機構が、
該加熱機構の下流側に設けた１群のプーリーであ
る特許請求の範囲第２項記載の装置。[Claims] 1. A method of bonding resin films by passing a resin film held between a pair of belts through a heating zone and a cooling zone, in which the resin film thermally bonded by passing through the heating zone. An improved method for adhering a resin film, characterized in that it is released from a belt and contracted before reaching a cooling zone. 2. A pair of endless belts arranged in parallel so as to be able to pinch and transfer the resin film, a driving mechanism for the belts, a heating mechanism and a cooling mechanism provided in the transfer section of the resin film, and the heating mechanism and the cooling mechanism. A resin film bonding device equipped with a mechanism for releasing the contact between the resin film and the belt in the middle. 3. A mechanism for releasing the contact between the resin film and the belt is provided between the heating mechanism and the cooling mechanism.
A pair of plate-shaped bodies are arranged in parallel on the downstream side of the heating mechanism via a connecting member, a resin film is passed between the plate-shaped bodies, and the belt is passed outside of the plate-shaped bodies. 3. The device according to claim 2, which is a mechanism comprising: 4. The device according to claim 3, wherein the belt upstream end of each of the pair of plate-shaped bodies is blade-shaped. 5 A mechanism for releasing the contact between the resin film and the belt between the heating mechanism and the cooling mechanism,
3. The device of claim 2, which is a group of pulleys downstream of the heating mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16823579A JPS5692015A (en) | 1979-12-26 | 1979-12-26 | Method and apparatus for welding improved resin film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16823579A JPS5692015A (en) | 1979-12-26 | 1979-12-26 | Method and apparatus for welding improved resin film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5692015A JPS5692015A (en) | 1981-07-25 |
| JPS626978B2 true JPS626978B2 (en) | 1987-02-14 |
Family
ID=15864272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16823579A Granted JPS5692015A (en) | 1979-12-26 | 1979-12-26 | Method and apparatus for welding improved resin film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5692015A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0186531U (en) * | 1987-11-30 | 1989-06-08 | ||
| US4981374A (en) * | 1988-09-30 | 1991-01-01 | Rapak, Inc. | Plastic bags carried in a continuous web |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1035333A (en) * | 1975-02-13 | 1978-07-25 | John J. Grevich | Band sealer for closing bags |
-
1979
- 1979-12-26 JP JP16823579A patent/JPS5692015A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5692015A (en) | 1981-07-25 |
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