The composite bag is made of polyester, nylon, aluminum foil and special polyolefin films by dry laminating process with adhesive, and then cooked, cut and made into cooking bag. After packaging food, the composite bag should be sterilized at 121-135 ℃ for 30-40 min. Not only the film used for bag making should be resistant to high temperature, but also the adhesive used for bonding the film should also be resistant to high temperature. Otherwise, the adhesion strength between the films will be reduced and delamination will occur after cooking.

現(xiàn)在市場上首要用于蒸煮袋復(fù)合用的膠粘劑首要是國外進(jìn)口產(chǎn)品。由化工研究院研制出了一種耐135 ℃高溫的蒸煮袋用膠粘劑，經(jīng)數(shù)次上機(jī)復(fù)合試驗(yàn)，其耐蒸煮性、耐內(nèi)容物性、衛(wèi)生性均滿意國內(nèi)廠家的要求。

At present, the most important adhesive used for cooking bag composite is imported products. A 135 ℃ high temperature resistant adhesive for cooking bags was developed by the Institute of chemical industry. After several tests on the machine, its cooking resistance, content resistance, health and safety meet the requirements of domestic manufacturers.

復(fù)合折邊袋包裝食物后，要經(jīng)121～135 ℃、30～40 min高溫處理，所用包裝資料一定是耐高溫的。常用于蒸煮袋包裝的資料有聚酯(PET)、尼龍(NY)、鋁箔(Al)、流延聚丙烯(CPP)等。膠粘劑則是要用耐高溫蒸煮的雙組分聚氨酯膠粘劑。通過干式復(fù)合工藝制成復(fù)合膜。

After the food is packed in the composite folding bag, it should be sterilized at 121-135 ℃ for 30-40 min. the packaging data used must be heat-resistant. Materials commonly used in cooking bag packaging are polyester (PET), nylon (NY), aluminum foil (AL), cast polypropylene (CPP), etc. The adhesive is a two-component polyurethane adhesive with high temperature resistance. The composite film was made by dry composite process.

干式復(fù)合首要工藝過程是基材經(jīng)網(wǎng)線輥涂膠后進(jìn)烘道鼓風(fēng)加熱干燥與基材借復(fù)合鋼輥加熱加壓后收卷制成復(fù)合膜。然后送到烘房加熱熟化幾天后，進(jìn)行分切后制袋。

The primary technological process of dry lamination is that the substrate is heated and dried by blowing in the drying channel after being glued by the wire roller, and the composite film is made of the substrate after being heated and pressurized by the composite steel roller. Then it is sent to the drying room for heating and curing for a few days, and then the bag is made after cutting.