JPH0573775B2 - - Google Patents
Info
- Publication number
- JPH0573775B2 JPH0573775B2 JP1175354A JP17535489A JPH0573775B2 JP H0573775 B2 JPH0573775 B2 JP H0573775B2 JP 1175354 A JP1175354 A JP 1175354A JP 17535489 A JP17535489 A JP 17535489A JP H0573775 B2 JPH0573775 B2 JP H0573775B2
- Authority
- JP
- Japan
- Prior art keywords
- lubricant
- film
- packaging material
- contact angle
- degrees
- 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 - Lifetime
Links
- 239000000314 lubricant Substances 0.000 claims description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000005022 packaging material Substances 0.000 claims description 27
- 235000013305 food Nutrition 0.000 claims description 17
- 229920001225 polyester resin Polymers 0.000 claims description 15
- 239000004645 polyester resin Substances 0.000 claims description 15
- -1 polyethylene Polymers 0.000 claims description 7
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 6
- 229930195729 fatty acid Natural products 0.000 claims description 6
- 239000000194 fatty acid Substances 0.000 claims description 6
- 150000004665 fatty acids Chemical class 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 229920006122 polyamide resin Polymers 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000001993 wax Substances 0.000 description 24
- 235000013351 cheese Nutrition 0.000 description 18
- 238000004806 packaging method and process Methods 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N isopropyl alcohol Natural products CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241000519695 Ilex integra Species 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 235000021058 soft food Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
Description
（産業上の利用分野）
本発明はチーズの如く軟質で粘着性が強い高含
水率食品の包装に好適な包装材に関する。
（従来の技術）
従来、チーズ等の食品に使用される包装材とし
ては、例えば実公昭58−12776号公報所載のもの
が存在する。
この従来のものは、第５図の如く、ポリエステ
ル樹脂フイルム１の外面側に滑剤２ｅを塗布した
ものである。当該包装材によれば、同図の如く粘
着性の強いチーズ５を包装して水冷させた場合で
あつても、フイルム１の外面側の撥水性が良好
で、当該包装体のスタツク性が良好となる。ま
た、ポリエステル樹脂はその剥離性が比較的優れ
るから、包装の開封時にチーズ５がフイルム内面
に多量に付着、残存する虞れも解消できる利点が
得られる。
尚、従来ではポリエステル樹脂フイルム１の外
面に塗着される滑剤２ｅとしては様々な種類のも
のが用いられているが、何れの場合に於いてもそ
の撥水性はさほど高くはなく、その水滴接触角は
せいぜい92度以下に止まるものであつた。
（発明が解決しようとする課題）
しかしながら、前記従来のものでは、近年に於
いて新商品が開発されるに連れて、次の様な新た
な問題点を生じていた。
即ち、近時、チーズ等の食品類は従来の製品よ
りも含水率が高く且つ軟質なものが多々開発され
るに至つている。
ところが、この様な食品を包装対象とする場合
には、もはや従来の包装材では対処できなくなつ
た。
従来に於いて、高含水率の食品（例えば水分量
が35重量％以上のもの）を包装した場合には、そ
の開封時に多量の食品が包材フイルム内面に付着
して残留する難点が発生していたのである。ま
た、係る難点は食品の保存温度が高温になればな
る程顕著となつていた。
尚、係る難点を解消する策として、例えばフイ
ルムの内面側にも滑剤等の撥水性を備えた物質を
塗着することが考えられる。しかるに、当該手段
ではフイルムへの滑剤塗着工程が倍増してその生
産コストが高価となるばかりか、食品を包装対象
とする場合には衛生上好ましいものではない。ま
た、フイルムの内外両面に滑剤を二重塗布すれば
フイルムの透明性が損なわれる問題点も生じる。
よつて、係る手段は実用上は到底適用できず、上
記難点を解消するには至らない。
それ故、本発明は包装材の外面側の撥水性、ス
タツク性等の種々の実用性を損なうことなく、包
装材の内面側と被包装物質との離型性を高めて、
高含水率では軟質なチーズ等の食品の包装が適切
に行える様にすることを、その目的とする。
（課題を解決するための手段）
この種包装材は、滑剤の塗着作業後に一旦ロー
ル状に巻き取られ、その後必要に応じて製袋等さ
れて使用されているが、本件発明者は、ポリエス
テル樹脂フイルムの片面に塗着する滑剤の配合成
分を種々変更して、これら滑剤を塗着したフイル
ムを一旦巻き取り、その後当該フイルムの他方側
の面を検査する試験を行つた。係る試験は工場内
に於ける一般的な作業条件下（室温15〜23℃、湿
度40〜70％RH、巻取圧２〜2.5Kg／cm2）で繰り返
し行つた。その結果、当該試験によつて次の様な
新たな事実を発見するに至つた。
水滴接触角が92度以下の滑剤を塗着した従来の
包装材では、滑剤が塗着されていないフイルム面
の撥水性はポリエステル樹脂そのものが有する撥
水性と明確な差異がない。ところが、滑剤の撥水
性を高めてその水滴接触角を95度以上とした場合
には、滑剤が塗着されていない他方側の面の撥水
性がポリエステル樹脂そのものの撥水性よりも高
まる現象を生じるのである。
係る現象の原因は必ずしも明らかではないが、
滑剤の水滴接触角を95度以上に高めた場合には、
フイルムが巻き取られる際に当該滑剤がフイルム
の他面側に対して撥水性を高める何らかの好まし
い影響を及ぼすものと考えられる。
本発明は上記現象に着目して発明されたもので
ある。
すなわち、本発明は、ポリエステル樹脂フイル
ム１の片面側に滑剤２が塗着されてなる包装材に
於いて、前記滑剤２の水滴接触角を95度以上とし
た、高含水率食品用の包装材である。
（作用）
上記構成の包装材は従来通り一旦巻き取つた後
使用されるが、当該包装材は上述した通りポリエ
ステル樹脂フイルム１の片面に塗着された撥水性
の高い滑剤２がフイルム１の他面側の撥水性を高
める現象を生じさせることとなる。よつて、滑剤
を塗着していない側のフイルム面を内側にして高
含水率のチーズ等を包装しても、該チーズ等との
離型性が非常に良好なものとなる。
また、フイルム１の外面側には滑剤２が存在す
るから、フイルム１の外面側の撥水性も損なわれ
ず、従来通りのスタツク性を発揮する。
（実施例）
以下、本発明の実施例について説明する。
第１図中、１は例えば厚さが10〜20μ程度の帯
状のポリエチレンテレフタレート製フイルムを示
す。
２はその片面側１ａ（外面側に相当）に塗着さ
れた滑剤を示す。滑剤２は、例えばポリアミド系
樹脂及び硝化綿からなるバインダー、脂肪酸アミ
ド系ワツクスやポリエチレンワツクスからなる撥
水性ワツクス、及び溶剤を主成分とするメジウム
インキを、適当な印刷手段によつて前記フイルム
１の片面に直接印刷して塗着されるものである。
但し、前記ワツクス成分量は、滑剤２の表面の水
滴接触角が95度以上となる分量に設定されてい
る。
具体的には、前記メジウムインキの一例とし
て、平均分子量4000のポリアミド系樹脂が14.1重
量部、硝化綿が6.6重量部、脂肪酸アミド系ワツ
クスが0.6重量部、ポリエチレンワツクスが3.0重
量部を、トルエン／酢酸エチル／イソプロピルア
ルコール（61／25／14）の混合剤75重量部で溶解
し、ザーンカツプNo.３で20秒の粘度の透明グラビ
ヤインキが適用される。また、係るメジウムイン
キを175線30μｍの版深のグラビア版で全面印刷
した処、当該滑剤２の表面の水滴接触角は99度で
あつた。
上記構成の包装材は、滑剤２の塗着作業後に第
２図の如くフイルム１の片面１ａ側の滑剤２に対
してフイルム１の他端面１ｂが重なる様にロール
状に巻き取ればよい。
上記一連の作業条件の一例を示せば、当該作業
は温度20℃、湿度65％の条件下で行い、フイルム
１の巻取圧は2.2Kg／cm2とした。又、巻き取られ
たフイルム１を前記の同一の温度及び湿度条件下
で80時間放置した後に、滑剤２が塗着されていな
い側のフイルム面１ｂの撥水性を検査した処、そ
の水滴接触角ば75度であつた。係る数値はポリエ
ステル樹脂そのものの接触角よりもかなり大きく
その撥水性が大幅に向上していることを示すもの
である。よつて、上記包装材では、高含水率のチ
ーズをその包装対象とする場合であつても優れた
離型性を発揮するものとなる。
本件発明者は、上記組成の滑剤２のワツクス分
量を増減することによりその撥水性（水滴接触
角）を変更して、滑剤が塗着されていないフイル
ム面とチーズとの剥離強度を検査した処、第３図
の如き結果が得られた。
但し、滑剤のワツクス分量以外の作業条件は全
て上記実施例と同一である。又、包装材はロール
状に巻き取り放置されたものを製袋して使用した
が、製袋された包装材の内部には所定の高含水率
のチーズを注入して水冷、脱水し、その後５℃で
１ヶ月間冷蔵し、更に５℃〜25℃の温度条件で10
日間放置したものについて測定した値である。
前記第３図に示すデータによれば、滑剤２の水
滴接触角が81度や92度の従来品に較べて本製品は
格段その剥離強度が小さくて済み、離型性及び開
封性に優れることが如実に証明されている。
また、同様な包装材を用いて、チーズと包装材
内面との剥がれ具合を試験した処、下記の第１表
の結果が得られた。
(Industrial Application Field) The present invention relates to a packaging material suitable for packaging soft and highly sticky high moisture content foods such as cheese. (Prior Art) Conventionally, packaging materials used for foods such as cheese include those described in Japanese Utility Model Publication No. 12776/1983, for example. In this conventional film, as shown in FIG. 5, a lubricant 2e is applied to the outer surface of the polyester resin film 1. According to the packaging material, even when the highly sticky cheese 5 is packaged and cooled in water as shown in the figure, the water repellency of the outer surface of the film 1 is good and the stackability of the package is good. becomes. Further, since the polyester resin has relatively excellent releasability, it has the advantage of eliminating the possibility that a large amount of cheese 5 may adhere to and remain on the inner surface of the film when the package is opened. Conventionally, various types of lubricants 2e have been used to coat the outer surface of the polyester resin film 1, but in all cases, their water repellency is not very high, and water droplets contact with At most, the angle was no more than 92 degrees. (Problems to be Solved by the Invention) However, with the above conventional products, as new products have been developed in recent years, the following new problems have arisen. That is, in recent years, many foods such as cheese have been developed that have a higher moisture content and are softer than conventional products. However, when packaging such foods, conventional packaging materials can no longer be used. Conventionally, when packaging food with a high moisture content (for example, food with a moisture content of 35% by weight or more), a large amount of the food adheres to the inner surface of the packaging film and remains when the package is opened. It was. In addition, this problem becomes more pronounced as the storage temperature of the food becomes higher. As a measure to solve this problem, it is conceivable to apply a water-repellent substance such as a lubricant to the inner surface of the film as well. However, this means not only doubles the process of applying the lubricant to the film and increases the production cost, but also is not hygienic when packaging food products. Furthermore, if the lubricant is applied twice on both the inner and outer surfaces of the film, the transparency of the film may be impaired.
Therefore, such means cannot be practically applied and cannot solve the above-mentioned problems. Therefore, the present invention improves the releasability between the inner surface of the packaging material and the packaged substance without impairing various practicalities such as water repellency and stackability of the outer surface of the packaging material.
The purpose is to allow foods such as cheese, which are soft at high moisture contents, to be packaged appropriately. (Means for Solving the Problems) This type of packaging material is once rolled up into a roll after applying a lubricant, and then used by making bags as necessary. A test was conducted in which the composition of the lubricant applied to one side of a polyester resin film was varied, and the film coated with the lubricant was once wound up, and then the other side of the film was inspected. Such tests were repeatedly conducted under typical working conditions in a factory (room temperature 15-23°C, humidity 40-70% RH, winding pressure 2-2.5 kg/cm 2 ). As a result, the following new facts were discovered through this test. In conventional packaging materials coated with a lubricant with a water droplet contact angle of 92 degrees or less, the water repellency of the film surface to which no lubricant is coated is not clearly different from the water repellency of the polyester resin itself. However, if the water repellency of the lubricant is increased so that the water droplet contact angle is 95 degrees or more, a phenomenon occurs in which the water repellency of the other side to which the lubricant is not applied becomes higher than the water repellency of the polyester resin itself. It is. Although the cause of this phenomenon is not necessarily clear,
When the water droplet contact angle of the lubricant is increased to 95 degrees or more,
It is believed that the lubricant has some favorable effect on the other side of the film to increase its water repellency when the film is wound up. The present invention was invented focusing on the above phenomenon. That is, the present invention provides a packaging material for high moisture content foods, in which a lubricant 2 is coated on one side of a polyester resin film 1, and the water droplet contact angle of the lubricant 2 is 95 degrees or more. It is. (Function) The packaging material having the above-mentioned structure is used after being rolled up in the conventional manner, but as described above, the highly water-repellent lubricant 2 coated on one side of the polyester resin film 1 is used in addition to the film 1. This results in a phenomenon that increases the water repellency on the surface side. Therefore, even if high moisture content cheese, etc. is packaged with the film surface on the side to which no lubricant is applied inside, the releasability from the cheese, etc. will be very good. Furthermore, since the lubricant 2 is present on the outer surface of the film 1, the water repellency of the outer surface of the film 1 is not impaired, and the film exhibits conventional stackability. (Example) Examples of the present invention will be described below. In FIG. 1, numeral 1 indicates a belt-shaped polyethylene terephthalate film having a thickness of about 10 to 20 μm, for example. 2 indicates a lubricant coated on one side 1a (corresponding to the outer surface). The lubricant 2 is, for example, a binder made of a polyamide resin and nitrified cotton, a water-repellent wax made of a fatty acid amide wax or a polyethylene wax, and a medium ink mainly composed of a solvent, which is applied to the film 1 by an appropriate printing means. It is printed and applied directly to one side of the paper.
However, the amount of the wax component is set to such an amount that the water drop contact angle on the surface of the lubricant 2 is 95 degrees or more. Specifically, as an example of the medium ink, 14.1 parts by weight of polyamide resin with an average molecular weight of 4000, 6.6 parts by weight of nitrified cotton, 0.6 parts by weight of fatty acid amide wax, 3.0 parts by weight of polyethylene wax, and toluene. A transparent gravure ink dissolved in 75 parts by weight of a mixture of /ethyl acetate/isopropyl alcohol (61/25/14) and a viscosity of 20 seconds with a Zahnkap No. 3 is applied. Further, when the medium ink was printed on the entire surface using a gravure plate having a depth of 30 μm and 175 lines, the contact angle of water droplets on the surface of the lubricant 2 was 99 degrees. The packaging material having the above structure may be wound into a roll after applying the lubricant 2 so that the other end surface 1b of the film 1 overlaps the lubricant 2 on one side 1a of the film 1, as shown in FIG. To give an example of the above series of working conditions, the work was carried out at a temperature of 20° C. and a humidity of 65%, and the winding pressure of the film 1 was 2.2 kg/cm 2 . In addition, after the wound film 1 was left for 80 hours under the same temperature and humidity conditions as described above, the water repellency of the film surface 1b on the side to which the lubricant 2 was not applied was examined. It was 75 degrees. This numerical value is considerably larger than the contact angle of the polyester resin itself, indicating that its water repellency is significantly improved. Therefore, the above-mentioned packaging material exhibits excellent mold releasability even when cheese with a high moisture content is to be packaged. The inventor of the present invention changed the water repellency (water droplet contact angle) of the lubricant 2 having the above composition by increasing or decreasing its wax content, and tested the peel strength between the film surface to which no lubricant was applied and the cheese. , the results shown in Figure 3 were obtained. However, all working conditions other than the amount of wax used as a lubricant were the same as in the above embodiments. In addition, the packaging material was rolled up into a roll and then left to make a bag. Cheese with a specified high moisture content was injected into the inside of the bag-made packaging material, cooled with water, dehydrated, and then Refrigerate at 5℃ for 1 month, and then store at a temperature of 5℃ to 25℃ for 10 minutes.
This is a value measured on a product that has been left for days. According to the data shown in Figure 3 above, compared to conventional products in which the water drop contact angle of lubricant 2 is 81 degrees or 92 degrees, this product has much lower peel strength and is superior in mold releasability and unsealability. has been clearly proven. Furthermore, using similar packaging materials, the degree of peeling between the cheese and the inner surface of the packaging material was tested, and the results shown in Table 1 below were obtained.
【表】
但し、左欄の温度：チーズの保存温度
上欄の温度：滑剤の水滴接触角
記号○：チーズの残留なし
△：チーズの残留あり
×：チーズの残留が顕著にあり
第１表によれば、滑剤の接触角が81度及び92度
の従来品に比較して、やはり95度以上の接触角の
滑剤を塗着した本製品が、その離型性に優れてい
ることが窺える。
尚、何れの場合に於いても滑剤を塗着していな
いフイルム面からは、滑剤中のワツクスやバイン
ダー等の成分が検出されなかつた。また、滑剤を
塗着したフイルム面側は、従前通りの撥水性を示
すことは勿論である。
また、上記と同様な作業条件下で製造された包
装材の滑剤の接触角と滑剤が塗着されていないフ
イルム面の接触角との相関関係の一例を第４図に
示す。
既述した通り滑剤の水滴接触角を順次大きくし
た場合に、95度を境界としてフイルム内面の接触
角が増大している。尚、ワツクスの種類を適宜変
更して同様な実験を試みたが、やはり前記第４図
と同様な曲線状態の結果が得られた。また、95度
以下であつても、滑剤の撥水性を高めるに連れて
フイルム内面の撥水性は多少高くなる傾向はある
ものの、この範囲では上記第３図や第１表の通
り、高含水率のチーズに対してはフイルム内面の
離型性がポリエステル樹脂そのものが有する離型
性と比較して明確な差異が生じる迄には至らな
い。
従つて、本発明に係る滑剤２は、その滑剤全体
としての水滴接触角が95度以上となる様に設定さ
れていればよく、滑剤２と具体的な成分を問うも
のではない。滑剤２は通常ワツクスとバインダー
から構成されるが、ワツクスとしては、既述の脂
肪酸アミド系やポリエチレンワツクスの如き炭化
水素系のもの以外として、高脂肪酸系、エステル
ワツクス系、及びその他の様々なワツクスの中か
ら一種或いは複数種適当に選択すればよい。但
し、実用上は食品包装に使用する場合には衛生上
無害のものを使用する必要がある。一方、バイン
ダーとしては、硝化綿やポリアミド樹脂等が代表
的で多用されるが、その具体的な成分、種類も限
定されない。
尚、滑剤のバインダーとしてポリアミド樹脂と
硝化綿を使用した場合に、ワツクスとして脂肪酸
アミド系ワツクスとポリエチレン系ワツクスの双
方又は何れか一方を使用する場合には、これらワ
ツクス分が滑剤の全固形分に対して７重量％以上
とした場合に、滑剤の水滴接触角が95度を越える
ことが判明した。よつて、係る組成と同一の滑剤
が適用される場合には、要はワツクス分量を７重
量％以上に配合すればよいこととなる。
また、本発明は滑剤をフイルムに塗着させる際
の具体的な方法も問わず、フイルム外面への全面
塗着を行わずに、斑状、縞状に塗着させる様な手
段を適用してもよいことは勿論である。更に、滑
剤を印刷塗着する場合に於ける溶剤の種類も問わ
ない。
更に、フイルム素材としては、要はポリエステ
ル樹脂が適用されればよいものであつて、その具
体的な種類としてはポリエチレンテレフタレート
のみならず、これを主要構成として他の成分を共
重合させたものでもよい。また、延伸、無延伸の
種別は問わない他、厚み等の具体的なサイズも問
わない。
更に、本発明に係る包装材は、チーズ以外の高
含水率で粘着性のある茹でうどんの如き麺類、御
手洗団子、豆大福や餅等の和菓子の様な食品の包
装にも最適である。但し、本発明はその具体的な
食品の種類はこれらに限定されず、それ以外の食
品包装に適用しても何ら構わない。また、包装材
を実際に使用するには、長尺状のフイルムを適当
なサイズに切断して適当な包装用袋として製袋す
る以外に、長尺のロール状のまま自動包装機にセ
ツトすることも可能であり、その具体的な使用態
様も一切問うものではない。
その他、本発明に係る包装材の具体的な構成は
全て本発明の意図する範囲内で任意に設計変更自
在である。
（発明の効果）
叙上の様に、本発明はポリエステル樹脂フイル
ムの片面に、表面の水滴接触角が95度以上の滑剤
を塗着したために、従来のものと同様に包装材外
面の撥水性、スタツク性が良好でその取扱性に優
れたものにできることは勿論のこと、フイルムの
片面に塗着された滑剤がそのフイルムを巻き取つ
た際に他方側のフイルム面の撥水性を高める影響
を及ぼし得ることとなつた。
その結果、滑剤が塗着されていない側のフイル
ム面がポリエステル樹脂そのものの撥水性を具備
するに過ぎなかつた従来のものに比して、本発明
ではその撥水性、離型性を格段優れたものにでき
て、従来の包装材では剥離が困難で好適に対処で
きなかつた高含水率の軟質な食品の包装に最適と
なる好ましい効果を有するに至つた。
しかも、本発明ではフイルム内面に滑材を塗着
する様な手段を採用していないから、衛生面で優
れ、又フイルムの透明度を損ねることもなく、極
めて実用的である。[Table] However, temperature in the left column: storage temperature of cheese Temperature in the upper column: water droplet contact angle of lubricant Symbol ○: No cheese residue △: Cheese residue ×: Significant cheese residue Table 1 According to the results, it can be seen that this product coated with a lubricant with a contact angle of 95 degrees or more has superior mold release properties compared to conventional products with lubricant contact angles of 81 degrees and 92 degrees. In any case, components such as wax and binder in the lubricant were not detected from the film surface to which the lubricant was not applied. In addition, the film surface coated with the lubricant naturally exhibits the same water repellency as before. Further, FIG. 4 shows an example of the correlation between the contact angle of the lubricant of a packaging material manufactured under the same working conditions as described above and the contact angle of the film surface to which no lubricant is applied. As mentioned above, when the water droplet contact angle of the lubricant is gradually increased, the contact angle on the inner surface of the film increases with a boundary of 95 degrees. Incidentally, similar experiments were attempted by changing the type of wax as appropriate, but results with curves similar to those shown in FIG. 4 were obtained. Furthermore, even at temperatures below 95 degrees, the water repellency of the inner surface of the film tends to increase somewhat as the water repellency of the lubricant increases, but in this range, as shown in Figure 3 and Table 1 above, the water content is high. For cheese, the mold releasability of the inner surface of the film does not reach a point where there is a clear difference compared to the mold releasability of the polyester resin itself. Therefore, the lubricant 2 according to the present invention only needs to be set so that the water droplet contact angle of the lubricant as a whole is 95 degrees or more, and the specific components of the lubricant 2 are not critical. The lubricant 2 is usually composed of wax and a binder, but in addition to the above-mentioned fatty acid amide waxes and hydrocarbon waxes such as polyethylene waxes, the lubricant 2 may include high fatty acid waxes, ester waxes, and various other waxes. One or more waxes may be appropriately selected from among various types of waxes. However, in practice, when used for food packaging, it is necessary to use a material that is harmless from a sanitary standpoint. On the other hand, as the binder, nitrified cotton, polyamide resin, and the like are typically used, but the specific components and types thereof are not limited. In addition, when polyamide resin and nitrified cotton are used as the binder of the lubricant, and when using fatty acid amide wax and/or polyethylene wax as the wax, the content of these waxes will be less than the total solid content of the lubricant. It was found that when the amount of lubricant was 7% by weight or more, the water drop contact angle of the lubricant exceeded 95 degrees. Therefore, when a lubricant having the same composition as that mentioned above is used, it is necessary to mix the wax in an amount of 7% by weight or more. Furthermore, the present invention is applicable to any specific method of applying the lubricant to the film, and it is also possible to apply a method of applying the lubricant in a patchy or striped manner without applying the lubricant to the entire surface of the film. Of course it's a good thing. Furthermore, the type of solvent used in printing and applying the lubricant does not matter. Furthermore, as a film material, it is sufficient to use polyester resin, and the specific type thereof is not limited to polyethylene terephthalate, but also those made by copolymerizing this as the main constituent with other components. good. Moreover, the type of stretching or non-stretching is not limited, and the specific size such as thickness is also not limited. Furthermore, the packaging material according to the present invention is also ideal for packaging foods other than cheese, such as noodles with high moisture content and stickiness such as boiled udon, Mitarai dango, Japanese sweets such as Mame Daifuku and mochi. However, the specific food types of the present invention are not limited to these, and may be applied to other food packaging. In addition, in order to actually use the packaging material, in addition to cutting a long film to an appropriate size and making it into a suitable packaging bag, it is necessary to set the long film in the form of a roll into an automatic packaging machine. It is also possible to do so, and there is no question as to the specific manner in which it is used. In addition, all the specific configurations of the packaging material according to the present invention can be freely modified within the scope of the present invention. (Effects of the Invention) As described above, the present invention coats one side of the polyester resin film with a lubricant having a water droplet contact angle of 95 degrees or more, which improves the water repellency of the outer surface of the packaging material, similar to conventional products. Not only does it have good stackability and excellent handling, but the lubricant applied to one side of the film has the effect of increasing the water repellency of the other side of the film when the film is wound. It became possible to have an impact. As a result, compared to conventional films in which the side of the film to which no lubricant is applied only has the water repellency of the polyester resin itself, the present invention has significantly superior water repellency and mold release properties. The present invention has achieved favorable effects that make it ideal for packaging soft foods with high moisture content, which are difficult to peel and cannot be handled appropriately with conventional packaging materials. Moreover, since the present invention does not employ means such as applying a lubricant to the inner surface of the film, it is excellent in terms of hygiene, does not impair the transparency of the film, and is extremely practical.
第１図は本発明に係る包装材の一実施例を示す
断面図。第２図は包装材を巻き取る工程を示す要
部断面図。第３図は滑剤の接触角と剥離強度との
関係を示す説明図。第４図は滑剤の接触角とフイ
ルム内面の接触角との関係を示す説明図。第５図
は従来例を示す説明図。
１……ポリエステル樹脂フイルム、１ａ……フ
イルム外面、１ｂ……フイルム内面、２……滑
剤。
FIG. 1 is a sectional view showing an embodiment of the packaging material according to the present invention. FIG. 2 is a sectional view of the main part showing the process of winding up the packaging material. FIG. 3 is an explanatory diagram showing the relationship between the contact angle of a lubricant and the peel strength. FIG. 4 is an explanatory diagram showing the relationship between the contact angle of the lubricant and the contact angle of the inner surface of the film. FIG. 5 is an explanatory diagram showing a conventional example. 1...Polyester resin film, 1a...Film outer surface, 1b...Film inner surface, 2...Lubricant.
Claims (1)
２が塗着されてなる包装材に於いて、前記滑剤２
の水滴接触角が95度以上であることを特徴とする
高含水率食品用の包装材。 ２ 滑剤２が、脂肪酸アミド系ワツクスとポリエ
チレン系ワツクスとの双方又は何れか一方からな
るワツクス分量を７重量％以上含有してなるポリ
アミド樹脂と硝化綿との混合揮発性塗膜である特
許請求の範囲第１項記載の高含水率食品用の包装
材。[Claims] 1. In a packaging material in which a lubricant 2 is coated on one side of a polyester resin film 1, the lubricant 2
A packaging material for high moisture content food, characterized by a water droplet contact angle of 95 degrees or more. 2 The lubricant 2 is a mixed volatile coating film of a polyamide resin and nitrified cotton containing 7% by weight or more of wax consisting of fatty acid amide wax and/or polyethylene wax. A packaging material for high moisture content food according to scope 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1175354A JPH0338339A (en) | 1989-07-05 | 1989-07-05 | Packing material for high water content food |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1175354A JPH0338339A (en) | 1989-07-05 | 1989-07-05 | Packing material for high water content food |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0338339A JPH0338339A (en) | 1991-02-19 |
| JPH0573775B2 true JPH0573775B2 (en) | 1993-10-15 |
Family
ID=15994607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1175354A Granted JPH0338339A (en) | 1989-07-05 | 1989-07-05 | Packing material for high water content food |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0338339A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6632493B1 (en) | 1997-03-31 | 2003-10-14 | The Procter & Gamble Company | Multi-layered plastic container providing good product drainage |
| JP5076385B2 (en) * | 2005-07-28 | 2012-11-21 | Ｊｆｅスチール株式会社 | Resin-coated metal plate for container and resin-coated metal can |
| JP4904124B2 (en) * | 2006-10-19 | 2012-03-28 | 富士マスキング株式会社 | Masking sheet roll manufacturing equipment with adhesive tape |
-
1989
- 1989-07-05 JP JP1175354A patent/JPH0338339A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0338339A (en) | 1991-02-19 |
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