Vacuum packaging is a general term for plastic products produced using vacuum molding technology and packaged with corresponding equipment.
Chinese name
Blister packaging
Processing technology
Vacuum molding
Main materials
PVC, APET, PETG, PP, PS, flocking, etc
Processing machinery
Vacuum forming machines, punching machines, sealing machines, etc
Product
Tray, container, suction card, double bubble shell, half bubble shell, etc
Overview
Introduction to vacuum molded products
Blister products mainly use high-quality PVC, PET, PP, PS, GAG, flocking and other plastic materials to produce high-end and various specifications of electronic vacuum packaging, stationery vacuum packaging, toy vacuum packaging, hardware vacuum packaging, food vacuum packaging, and daily chemical gift handicraft vacuum packaging. Blister packaging is of excellent quality, affordable, and can beautify your product, attracting more customers.
Advantages of vacuum packaging:
1、 Blister packaging can increase the price and image of the product itself, while also having a shaping and dissemination effect, which has a significant impact on the brand image and visibility of the enterprise.
2、 Blister packaging is also designed to showcase and protect products. The packaged products are mostly small commodities that can be placed or hung on supermarket shelves, allowing your products to be perfectly displayed in front of customers and promoting product sales.
3、 The purpose of vacuum packaging is to separate, shock-absorbing, and accompany. The packaged products are mostly electronic, IT, industrial parts, toys, stationery, food, handicrafts, cosmetics, etc. It can package many but small products, making the products more aesthetically pleasing as a whole.
Blister packaging
The products mainly include: bubble shells, trays, vacuum boxes, and synonyms include: vacuum covers, bubble covers, etc.
equipment
The vacuum packaging equipment mainly includes: vacuum packaging machines, vacuum forming machines, punching machines, sealing machines, high-frequency machines, and folding machines.
product
The packaging products formed by packaging can be divided into: card insertion, card suction, double bubble shell, half bubble shell, half fold bubble shell, triple fold bubble shell, etc.
raw material
The raw materials for vacuum packaging mainly include PVC, PS, PP, PET, PETG, as well as materials such as flocking, anti-static, conductive, etc.
Production process
1: Mold making and processing: According to the requirements or sample specifications, the first step is to make a vacuum plastic mold. Generally, gypsum is used to make vacuum plastic packaging molds, but wooden and metal carved products are also used as molds. After the gypsum mold is made, it is allowed to dry naturally or completely. Then, according to the specific situation of the product surface’s convexity and concavity, 1-2 millimeters of drill flowers are used to drill many small holes in the low and concave areas that do not affect the product packaging shape. If it is a packaging box or similar product, some small holes need to be drilled on the four sides so that air can be extracted during vacuum plastic production. After drilling the holes in the mold, the gypsum mold needs to be hardened. The hardening treatment method is to saturate with concentrated alum. Soak in liquid and let it dry.
2: After the mold is completely dried, place the mold onto the upper iron plate of the vacuum chamber. Then, according to the size of the mold, load the plastic sheets into suitable specifications and sizes. Then, place the sheet material into a heated wooden cabinet to fix it completely. Finally, place the wooden cabinet and plastic sheets on a constant temperature furnace for softening treatment.
3: Place the softened plastic sheets together with the wooden cabinet in a vacuum chamber, activate the suction switch to clean the air inside the vacuum chamber, and wait for the plastic sheets to cool down to obtain the same concave packaging or process mold as the mold.
4: Vacuum packaging and sorting; The finished product is obtained by trimming and organizing the edges of the produced product, which can be sold after packaging
Blister material
1、 PVC sheets have high toughness and are not easy to burn. When burned, chlorine gas is produced, which has a certain impact on the environment. PVC is easy to heat and can be sealed using sealing machines and high-frequency edge banding. It is the main raw material for producing transparent vacuum molded products. PVC film is a widely used and popular material. PVC film can be divided into two types: environmentally friendly and non environmentally friendly. It can be made into various vacuum packaging products such as transparent, colored, anti-static, gold-plated, flocked, etc. Its main characteristics are high transparency, good surface gloss, few crystal points, small water marks, wide use, strong impact resistance, and easy molding. The products are widely used for packaging of toys, food, electronic products, medicine, electrical appliances, gifts, cosmetics, stationery, and other products.
2、 PS hard sheets have low density, poor toughness, are prone to combustion, and produce styrene gas (a harmful gas) during combustion, so they are generally used to produce various industrial vacuum pallets. PS sheet is a new type of environmentally friendly packaging material that has developed in recent years. With its excellent thermal forming performance, good environmental and hygiene performance, it is widely used in medicine, food, toys, and electronics.
3、 PET hard sheets have good toughness and are a new type of material developed in recent years. Due to its excellent toughness, high strength, high transparency, and recyclability, it is easy to burn and does not produce harmful gases during combustion. As an environmentally friendly material, PVC has gradually been phased out, but its price is high. Suitable for high-end vacuum molded products, PET material is generally required for vacuum molded shell in European and American countries, but its high hot melting point poses great difficulties for high cycle packaging.
4、 PETG material is used to solve the problem of high hot melting point of PET materials. People composite a layer of PVC film on the surface of PET, named PETG, but the price is higher. Mainly used in electronics, food, toys, color box windows, collar holders, shoe packaging, etc. [span] Its advantages are as follows:
- It has excellent transparency and smoothness, and good display effect.
- Excellent surface decoration performance, can be printed without surface treatment, easy to press patterns, and easy to metal treat (vacuum plated metal layer)
- Has good mechanical strength.
- Good barrier performance for oxygen and water vapor.
- It has good chemical resistance and can withstand the erosion of various chemical substances.
- It is non-toxic and has reliable hygiene performance. It can be used for packaging food, drugs, and medical equipment, and can be disinfected by Y-rays.
- It has good adaptability to environmental protection and can be economically and conveniently recycled; When burning its waste, it does not produce harmful substances to the environment. This type of sheet material is considered an ideal packaging material that meets the requirements of (ROSH) environmental protection.
5、 PP sheets are mainly made of polypropylene resin as the main raw material, with various process color masterbatches, toughening agents, and brighteners added. They are made through mixing, plasticizing extrusion, three roll calendering, cooling, traction, and winding processes. PP sheets have the characteristics of being non-toxic, odorless, hygienic, with high mechanical strength and good barrier properties, and can be used for packaging in industries such as industry, agriculture, and fruits. The surface of the tray made of PP anti slip sheets is smooth and beautiful, which is highly welcomed by users. PP sheet is also suitable for packaging of high cold resistant frozen foods, such as ice cream boxes, dumplings boxes, dumplings boxes, etc.
PP vacuum molding has the advantages of environmental protection, aesthetics, silk screen printing, offset printing, hot stamping, high temperature resistance, low temperature resistance, high transparency, resistance to bending and easy folding, product compliance with food testing standards (or not required), and microwave capability.
The disadvantages of PP include low dimensional accuracy, insufficient rigidity, poor weather resistance, and susceptibility to copper damage. It exhibits post shrinkage and is prone to aging, brittleness, and deformation after demolding.
main features
1) Good protection.
2) Transparent and intuitive.
3) Easy to use.
4) Lightweight.
Mold selection
There are generally three types of vacuum packaging molds: gypsum mold, electroplated copper mold, and aluminum mold
Gypsum mold: Carving and shaping gypsum in a semi wet state, and then drying it to form a mold. Gypsum mold has low cost and is easy to modify, but its accuracy is not high enough, the surface is not smooth, and it is fragile and not durable. Therefore, it is often used as a mold for feinting, making electroplated copper molds, or some vacuum molding molds with low requirements for small batch production.
Aluminum mold: Made from aluminum ingots through mechanical processing (such as lathes, milling machines, CNC machines, etc.). Aluminum molds have high precision, smooth surface, and durability, but they are very expensive. Aluminum molds are generally used in vacuum molded products that require higher precision than copper molds.
Electroplated copper mold: After making a sample using gypsum mold, a layer of copper shell is electroplated to form an electroplated copper mold. The cost is relatively high compared to gypsum mold, but much cheaper than aluminum mold. Due to its advantages of smooth, durable, and low-cost surface, electroplated copper mold is the most commonly used vacuum molding mold.
Terminology and Nouns
Blistering: a plastic processing technology that mainly involves heating flat plastic hard sheets to soften them, using vacuum adsorption on the surface of the mold, cooling them, and forming them. It is widely used in industries such as plastic packaging, lighting, advertising, and decoration.
Blister packaging: a general term for plastic products produced using the vacuum molding process and packaged with corresponding equipment. Blister packaging products mainly include: blister shells, trays, blister boxes, and synonyms include: vacuum covers, blister covers, etc. The vacuum packaging equipment mainly includes: vacuum molding machine, punching machine, sealing machine, high-frequency machine, and folding machine.
Bubble shell: Using vacuum molding technology to make transparent plastic hard sheets into specific convex shaped transparent plastic, covering the surface of the product to protect and beautify the product. Also known as bubble hood or vacuum hood
Tray: also known as plastic inner tray, uses vacuum molding technology to make plastic hard sheets into specific grooves of plastic, and places the product in the grooves to protect and beautify the product.
Flocking inner tray: It is a type of blister tray made of special materials, which glues a layer of plush material on the surface of ordinary plastic hard sheets to give the tray a plush texture, used to improve the quality of packaging products.
Anti static tray: It is a vacuum tray made of special materials, with a surface resistance value of less than 10 to the 11th ohm. Mainly used for blister trays in electronic and IT products.
Vacuum forming mold: The mold used for vacuum forming production has the lowest cost, which is gypsum mold, followed by electroplated copper mold, and the most expensive is aluminum mold. The mold is drilled with small holes for vacuum adsorption and heating of hard sheets to form vacuum molded products.
Vacuum forming: It is commonly known as vacuum forming, which uses a vacuum forming machine to adsorb the heated and softened plastic hard sheets onto the surface of the mold, and after cooling, form a concave convex shaped plastic.
Vacuum cutting: After vacuum forming, plastic products are cut into individual pieces using a punching machine to cut large sheets of material into individual products.
Folding: There is a type of blister packaging called card insertion packaging, which requires folding the three edges of the blister to the back using a folding machine, so that in the next packaging process, the paper card can be inserted into the folded edge to form a card insertion packaging.
Heat sealing: It is a vacuum sealing process that uses a sealing machine to heat seal paper cards coated with vacuum oil and bubble shells together to form vacuum packaging.
High frequency sealing: It is a vacuum packaging process that uses a high-frequency machine to generate high frequencies and bond the blisters together to form a double blister packaging.
Ultrasonic sealing: It is a vacuum molding packaging process that uses an ultrasonic machine to generate ultrasonic waves, which bond the bubble shell and bubble shell together to form a double bubble shell packaging. Unlike high-frequency sealing, ultrasonic waves can not only seal PVC, PETG materials, but also PET materials, and there is no electromagnetic damage to the packaged products, making it particularly suitable for packaging electronic products; The disadvantage is that ultrasonic edge sealing can only be in the form of spaced points, and generally only one straight edge is sealed at a time.
