Application of sandwich board substrate include1. Advertising and promotion: Sandwich board substrates are commonly used for advertising and promotion purposes. They are perfect for displaying promotional messages, sales offers, and new product launches. They can be placed outside shops, restaurants, cafes, and other businesses to attract customers.2. Event signage: Sandwich board substrates are also used for event signage. They can be placed at the entrance of an event, directing attendees to the registration desk, parking lot, or other important areas. They can also be used to display schedules, maps, and other important information.3. Directional signage: Sandwich board substrates are ideal for directional signage. They can be used to direct people to a specific location, such as a museum, park, or historical site. They can also be used to direct people to a specific business or office within a building.4. Safety signage: Sandwich board substrates can be used for safety signage. The…