塑料包裝袋的生產要注意什么？
一、生產工藝流程
1、 Production process flow
二、印刷
2、 Printing
凹版印刷：是指將原稿上的文字、圖案制成印版，在印版表面涂上油墨，通過壓力使印版上的圖文轉移到被印材料的表面上，準確地、大量地復制出與原稿相同的印刷品。
Gravure printing: refers to making a printing plate from the text and pattern on the original, applying ink on the surface of the printing plate, and transferring the image and text on the printing plate to the surface of the printed material through pressure, so as to accurately and massively reproduce the same printed matter as the original.
分表印和里印。
It is divided into table printing and internal printing.
三、復合
3、 Compound
塑料復合軟包裝基本原理：每種材料有不同的優缺點，通過媒介（如膠水）將二層或二層以上的材料粘合在一起，使包裝膜、袋達到更好性能的技術。這種技術在生產工序中叫“復合工序”。
The basic principle of plastic composite flexible packaging: each material has its own advantages and disadvantages. It is a technology that uses media (such as glue) to bond two or more layers of materials together to make the packaging film and bag achieve better performance. This technology is called "composite process" in the production process.
四、熟化
4、 Ripening
熟化的目的是加快材料之間的膠水固化的速度。
The purpose of curing is to accelerate the speed of glue curing between materials.
五、分切
5、 Slitting
將印刷、復合好的材料分切成客戶所需的規格。
Cut the printed and composite materials into the specifications required by customers.
六、制袋
6、 Bag making
將印刷、復合、分切好的材料制成客戶所需的各式袋子。可制做多種袋型：中封袋、邊封袋、直立袋、K型袋、R袋、四邊封袋、拉鏈袋。
The printed, composite and cut materials are made into various bags required by customers. It can be made into a variety of bag types: middle seal bag, side seal bag, upright bag, K-type bag, R-type bag, four-side seal bag, zipper bag.
七、品質控制
7、 Quality control
1、原材料入庫前檢測
1. Inspection of raw materials before warehousing
2、產品在線檢測
2. Product online inspection
印刷品檢—殘留溶劑、套位等
Print inspection - residual solvents, sockets, etc
復合品檢—復合強度、氣泡、起皺等
Composite inspection - composite strength, bubbles, wrinkling, etc
制袋品檢—封口強度、尺寸偏差等
Bag making inspection - sealing strength, size deviation, etc
3、產品出貨前品檢
3. Product inspection before shipment
八、常用印刷材料
8、 Common printing materials
BOPP
BOPP
雙向拉伸聚丙烯，它是經過雙向拉伸后形成的薄膜，沒有熱封性能，常用作印刷材料，因其有優越的防濕性能，適用于易吸潮的餅干、涼果、膨化食品、瓜子等的表層印刷材料。
Biaxially stretched polypropylene, which is a film formed after biaxial stretching, has no heat sealing property, and is often used as a printing material. Because of its excellent moisture resistance, it is suitable for the surface printing materials of biscuits, cold fruits, puffed foods, melon seeds, etc. that are easy to absorb moisture.
KOP
KOP
涂層雙向拉伸聚丙烯，是在OPP表面涂了一層約1-2um的聚偏二氯乙烯（PVDC，也叫K涂層），所以KOP既有OPP的性能，又有PVDC有優點。常用于月餅等需隔氧及隔水的食品。KOP具有類似鋁薄的阻隔功能，又透明、可以看見包裝內容物。
Coated biaxially oriented polypropylene is coated with a layer of about 1-2um polyvinylidene chloride (PVDC, also known as K coating) on the surface of OPP, so KOP has both the properties of OPP and the advantages of PVDC. It is often used for moon cakes and other foods requiring oxygen and water separation. KOP has the barrier function similar to aluminum thin, and it is transparent and can see the contents of the package.
PCO
PCO
雙向熱封聚丙烯膜，其有OPP的性能，又有雙面熱封的性能；常用于磁盤、紫菜的包裝。
Two-way heat sealing polypropylene film has the properties of OPP and double-sided heat sealing; It is often used for the packaging of disk and laver.
PL
PL
雙向熱封聚丙烯珠光膜，是以聚丙烯樹脂為主要原料，加入一定量的珠光粉料，經雙向拉伸而成。用于化妝品、香皂、標簽等的包裝。
Bi-directional heat-sealing polypropylene pearlescent film is made of polypropylene resin as the main raw material, adding a certain amount of pearlescent powder, and biaxially stretching. Used for packaging cosmetics, soap, labels, etc.
PET
PET
聚脂膜
Polyester film
和OPP一樣，是在縱向拉伸后進橫向拉伸的二級雙向拉伸蒲膜，或縱橫同時拉伸，而后熱固定的拉伸膜。常用作機器包裝卷膜、高溫蒸煮袋、拉鏈袋等產品的印刷材料。
Like OPP, it is a two-stage biaxial stretch film that is stretched horizontally after longitudinal stretch, or a stretch film that is stretched vertically and horizontally at the same time, and then thermally fixed. It is often used as the printing material for machine packaging film, high-temperature cooking bag, zipper bag and other products.
KPET
KPET
中文名：涂層聚脂膜，是PET表面涂了一層約1-2um的聚偏二氯乙烯（PVDC，也叫K涂層）。
Chinese name: coated polyester film is a layer of polyvinylidene chloride (PVDC, also known as K coating) with a thickness of 1-2um on the surface of PET.
所以KPET既有PET的性能，又有PVDC有優點。常用于月餅等需隔氧及隔水的食品。和KOP一樣，具有類似鋁薄的阻隔功能，又透明、可以看見包裝內容物。其的耐高溫性能使其更適合機器包裝及其他需高耐高溫的袋型。
Therefore, KPET has both the performance of PET and the advantages of PVDC. It is often used for moon cakes and other foods requiring oxygen and water separation. Like KOP, it has the barrier function similar to aluminum thin, and is transparent and can see the contents of the package. Its excellent high temperature resistance makes it more suitable for machine packaging and other bag types requiring high temperature resistance.
NY
NY
尼龍，抽真空包裝、冷凍、高溫蒸煮食品的包裝；常用厚度為15um，因為很薄，所以擺動起來很響；密度為1.15g/cm3。
Nylon, vacuum packaging, frozen, high-temperature cooking food packaging; The commonly used thickness is 15um, because it is very thin, so it swings very loud; The density is 1.15g/cm3.
PVC
PVC
聚氯乙烯，一般用于瓶樽的標簽，單層材料，印刷完成不需復合，需用PVC膠水（酒精與環已酮1：1配比）粘合；常用厚度：40um。
PVC, which is generally used for labels of bottles and bottles, is a single-layer material. It does not need to be compounded after printing, but needs to be bonded with PVC glue (1:1 ratio of alcohol and cyclohexanone); Common thickness: 40um.
Mat-opp
Mat-opp
雙向拉伸聚丙烯消光膜，常用于膨化食品、月餅、紙巾、化妝品的包裝。
Biaxially stretched polypropylene matting film is often used for packaging puffed food, moon cakes, paper towels and cosmetics.
九、常用復合材料
9、 Common composite materials
CPP
CPP
未拉伸聚丙烯，其與經過拉伸的OPP不同，CPP是在薄膜成形后保持原有關態下進行冷卻固化的。CPP是常用的熱封材料。作為印刷材料常用作紙巾的包裝；作為復合材料，常用作與其它材料一起復合，作為熱封層。
Unstretched polypropylene is different from stretched OPP. CPP is cooled and solidified after the film is formed and kept in the original off state. CPP is the most commonly used heat sealing material. As a printing material, it is often used as the packaging of paper towels; As a composite material, it is often used to composite with other materials as a heat seal.
PET
PET
未拉伸聚乙烯，常用PE有IPE、CPE、LLDPE、普通PE。和CPP一樣是常用的熱封材料。用于包裝奶粉、洗發水、洗衣粉等化工產品。除常用作表層印刷材料外，也可作為復合材料，其沒有熱封性能，不能放在熱封層，一般用作產品中間復合層，可以增加袋子挺度及阻隔氧氣性能。
Unstretched polyethylene, commonly used PE include IPE, CPE, LLDPE and ordinary PE. Like CPP, it is the most commonly used heat sealing material. It is used for packaging chemical products such as milk powder, shampoo and washing powder. In addition to being used as surface printing material, it can also be used as composite material. It has no heat sealing performance and cannot be placed on the heat sealing layer. It is generally used as the intermediate composite layer of the product, which can increase the stiffness of the bag and block oxygen performance.
VMPET
VMPET
鍍鋁聚酯膜，即在PET表面蒸鍍了一層鋁箔，兼有PET的性能，又有鋁箔的性能。
Aluminized polyester film, that is, a layer of aluminum foil is evaporated on the surface of PET, which has the properties of both PET and aluminum foil.
VMCPP
VMCPP
鍍鋁未拉伸聚丙烯，即在CPP表面蒸鍍了一層鋁箔，兼有CPP與AL的性能。
Aluminized unstretched polypropylene, that is, a layer of aluminum foil is evaporated on the surface of CPP, which has the properties of CPP and AL.
AL
AL
鋁箔，隔絕性與遮光性很好。鋁箔本身強度低，無熱粘合性，折疊處易斷裂，所以很少單獨使用，一般用于對氧氣和水份非常敏感的產品，復合軟包裝，具有非常好的防潮、防氧及防紫外線性能。
Aluminum foil, good insulation and shading. Aluminum foil has low strength, no thermal adhesion, and is easy to break at the fold, so it is rarely used alone. It is generally used for products that are very sensitive to oxygen and moisture. Advanced composite flexible packaging has very good moisture, oxygen and ultraviolet protection properties.
NY
NY
尼龍，除常用作表層印刷材料外，也可作為復合材料，其沒有熱封性能，不能放在熱封層，一般用作產品中間復合層，可以增加袋子的封口強度和耐刺扎性；常用于需耐壓力和耐高溫的袋子的中間層。比如果凍袋、洗衣液袋、板栗袋等。其耐油的性能適用于包裝肉食和其他油性較重的產品。
Nylon, in addition to being used as surface printing material, can also be used as composite material. It has no heat sealing performance and cannot be placed in the heat sealing layer. It is generally used as the intermediate composite layer of the product, which can increase the sealing strength and puncture resistance of the bag; It is often used in the middle layer of bags that need to be resistant to pressure and high temperature sterilization. Such as frozen bag, detergent bag, chestnut bag, etc. Its oil resistance is suitable for packaging meat and other products with heavy oil.
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